JP7808952B2 - Floating body - Google Patents

Description

This disclosure relates to a floating body.

In floating structures such as ships, when ammonia is transported and supplied as fuel for power plants or when ammonia is used as fuel for main engines, etc., there is a possibility that ammonia may leak in compartments such as equipment rooms that house equipment that handles ammonia.If an ammonia leak occurs in such a compartment, it is expected that the leaked ammonia will vaporize and leak outside the compartment.
Patent Document 1 proposes a technology for preventing ammonia from leaking outside the compartment by providing a sealed duct that communicates with the compartment, spraying water inside the duct, and causing the ammonia to be absorbed by the water inside the duct, thereby creating a negative pressure inside the compartment. In Patent Document 1, the water that has absorbed the ammonia is returned to the water tank and circulated again through the spray nozzles, or is discharged to another treatment facility.

Patent No. 4356939

However, when attempting to remove ammonia by absorbing it into water, as in Patent Document 1, the amount of water required increases as the amount of ammonia discharged increases. However, because there is limited space inside the float, it may not be possible to secure a place to store large amounts of water that has absorbed ammonia. Furthermore, because of the potential impact on the environment, water containing ammonia cannot be simply released into the water surrounding the floating body. Therefore, there is a need to treat the water that has absorbed ammonia on the floating body to detoxify it.

One method for removing ammonia from water that has absorbed it is to use an acid such as dilute sulfuric acid. However, acids such as dilute sulfuric acid can be difficult to obtain at ports of call or mooring locations, and handling them requires skill, which increases the burden on workers.
On the other hand, highly concentrated ammonia can be rendered harmless by burning it without absorbing it in water. However, because the process of removing ammonia as described above occurs irregularly and needs to be completed in a short time, the combustion device requires a constant pilot flame, which increases fuel consumption.
The present disclosure has been made to solve the above-mentioned problems, and aims to provide a float that can detoxify absorption liquid that has absorbed ammonia while suppressing an increase in the burden on workers and fuel consumption.

In order to solve the above problems, the following configuration is adopted.
A float according to one aspect of the present disclosure includes a float body floating on water, an ammonia introduction section into which ammonia in the float body can be introduced, an absorbing liquid introduction section into which an absorbing liquid capable of absorbing the ammonia can be introduced, a reactor that produces an ammonia absorbing liquid by reacting the ammonia from the ammonia introduction section with the absorbing liquid from the absorbing liquid introduction section, a recovery tank into which the ammonia absorbing liquid produced in the reactor and discharged from the reactor is introduced and in which the ammonia absorbing liquid can be stored, and an atmosphere release line that can release the gas phase in the recovery tank to the atmosphere.

The floating structure of the above aspect can detoxify the absorbing liquid that has absorbed ammonia while minimizing increases in worker burden and fuel consumption.

FIG. 1 is a side view of a floating body according to a first embodiment of the present disclosure. 1 is a diagram showing a schematic configuration of a piping system for performing fuel purging and an ammonia detoxification device according to a first embodiment of the present disclosure. FIG. FIG. 10 is a view corresponding to FIG. 2 in a second modified example of the first embodiment of the present disclosure. FIG. 10 is a view corresponding to FIG. 2 in a fourth modified example of the first embodiment of the present disclosure. FIG. 10 is a view corresponding to FIG. 2 in a fifth modified example of the first embodiment of the present disclosure. FIG. 6 is a diagram corresponding to FIG. 5 according to a second embodiment of the present disclosure. FIG. 10 is a diagram corresponding to FIG. 2 in a third embodiment of the present disclosure. FIG. 10 is a diagram showing a piping system around a denitration ammonia solution tank of a denitration device according to a fourth embodiment of the present disclosure. FIG. 10 is a diagram showing a schematic configuration of an ammonia detoxification device according to a fifth embodiment of the present disclosure. FIG. 13 is a diagram showing the arrangement relationship between the dilution tank and the recovery tank of the ammonia removal apparatus according to a first modified example of the fifth embodiment of the present disclosure.

[First embodiment]
A floating body according to a first embodiment of the present disclosure will be described below with reference to the drawings. Fig. 1 is a side view of the floating body according to the first embodiment of the present disclosure.
(Configuration of the floating body)
As shown in Fig. 1, the float 1 of this embodiment includes a float main body 2, a superstructure 4, a combustion device 8, an ammonia tank 10, a piping system (fuel line) 20, a compartment 30, and an ammonia detoxification device 60. The float 1 of this embodiment will be described as an example of a ship that can navigate using a main engine or the like. The type of ship that the float 1 is not limited to a specific type of ship. Examples of the type of ship that the float 1 can be used for include a liquefied gas carrier, a ferry, a RORO ship, a car carrier, and a passenger ship.

The floating body 2 has a pair of side panels 5A, 5B that form its outer hull, and a bottom 6. The side panels 5A, 5B each have a pair of side paneling that form the port and starboard sides. The bottom 6 has a bottom paneling that connects the side panels 5A, 5B. Together with the pair of side panels 5A, 5B and the bottom 6, the outer hull of the floating body 2 forms a U-shape in cross section perpendicular to the bow-stern direction FA.

The floating body 2 further comprises an upper deck 7, which is the uppermost, full-length deck. The superstructure 4 is formed on this upper deck 7. Accommodation areas and the like are provided within the superstructure 4. In the floating body 1 of this embodiment, for example, a cargo space (not shown) for carrying cargo is provided closer to the bow 3a in the bow-stern direction FA than the superstructure 4.

The combustion device 8 is a device that generates thermal energy by burning fuel and is installed within the floating body main body 2. Examples of the combustion device 8 include an internal combustion engine used as the main engine for propelling the floating body 1, an internal combustion engine used in the power generation equipment that supplies electricity on board, and a boiler that generates steam as a working fluid. The combustion device 8 of this embodiment is capable of switching between ammonia and other fuels different from ammonia, such as diesel, as fuel.

The ammonia tank 10 is a tank that stores liquid ammonia (in other words, liquefied ammonia). This ammonia tank 10 is installed on the upper deck 7, closer to the stern 3b than the superstructure 4. Note that the placement of the ammonia tank 10 described above is an example, and is not limited to being on the upper deck 7, closer to the stern 3b than the superstructure 4. The ammonia tank 10 of this embodiment stores liquefied ammonia as fuel for the combustion device 8.

The piping system 20 connects the combustion device 8 and the ammonia tank 10 and is configured to supply at least the ammonia stored in the ammonia tank 10 to the combustion device 8.

Compartment 30 is a compartment that houses ammonia-related equipment. In this embodiment, compartment 30 is located on the upper deck 7, closer to the bow 3a than the superstructure 4. The piping system 20 described above connects the combustion device 8 and the ammonia tank 10 through this compartment 30. Here, the ammonia-related equipment refers to all equipment that handles ammonia, and examples include ammonia fuel equipment that handles ammonia and ammonia cargo equipment that handles ammonia as cargo. In the following explanation, we will describe compartment 30 that houses ammonia fuel equipment, but it may also be compartment 30 that houses ammonia cargo equipment.

Compartment 30 in this embodiment is a fuel supply device chamber that houses ammonia fuel equipment that constitutes part of the piping system 20. Examples of ammonia fuel equipment housed in the fuel supply device chamber include a pump that pressure-feeds ammonia from the ammonia tank 10 to the combustion device 8, a heater for heating the ammonia sent to the combustion device 8, an electric valve, etc. Note that compartment 30 housing the ammonia fuel equipment is not limited to an ammonia fuel supply device chamber. Compartment 30 housing the ammonia fuel equipment may also be, for example, an ammonia fuel pressure regulating valve chamber, an ammonia fuel intake chamber (in other words, a bunker station), etc.

(Piping system for fuel purging)
FIG. 2 is a diagram showing a schematic configuration of a piping system for performing fuel purging and an ammonia detoxification device according to the first embodiment of the present disclosure.
As shown in Fig. 2, the floating body 1 of this embodiment is provided with an ammonia buffer tank 40 that temporarily stores ammonia supplied from the ammonia tank 10. The ammonia buffer tank 40 is installed in the middle of the piping system 20 between the ammonia tank 10 and the combustion device 8. In addition, an inert gas supply device 50 is connected to the piping system 20.

The piping system 20 includes a supply pipe 21, a return pipe 22, on-off valves 23 and 24, and a residual ammonia supply line 25 between the ammonia buffer tank 40 and the combustion device 8. The supply pipe 21 and return pipe 22 connect the ammonia buffer tank 40 and the combustion device 8, respectively. The supply pipe 21 supplies ammonia from the ammonia buffer tank 40 to the combustion device 8. The return pipe 22 returns excess ammonia that is not used as fuel in the combustion device 8 to the ammonia buffer tank 40. The supply pipe 21 is also equipped with an ammonia pressure pump that pressurizes and pumps ammonia toward the combustion device 8, and an ammonia heat exchanger (neither shown) that heats the ammonia pressurized by the ammonia pressure pump.

On-off valve 23 is provided in supply pipe 21. On-off valve 24 is provided in return pipe 22. These on-off valves 23, 24 are always open when combustion device 8 is operating. On the other hand, on-off valves 23, 24 are closed when combustion device 8 is stopped, etc. When these on-off valves 23, 24 are closed, the flow paths formed inside supply pipe 21 and return pipe 22 are blocked.

The inert gas supply device 50 performs a so-called purge, replacing ammonia in the flow path R through which ammonia flows as fuel for the combustion device 8 with an inert gas (purge gas) such as nitrogen. The inert gas supply device 50 includes an inert gas supply unit 51, an inert gas supply pipe 52, and an inert gas supply valve 53. The inert gas may be, for example, an inert gas generated inside the floating body 2 by an inert gas generation device (not shown), or an inert gas stored in advance in an inert gas tank (not shown) installed in the floating body 2. Note that the inert gas may be any gas that does not chemically react when it comes into contact with ammonia.

The inert gas supply unit 51 supplies an inert gas to the inert gas supply pipe 52 .
The inert gas supply pipe 52 connects the inert gas supply unit 51 and the flow path R. More specifically, the inert gas supply pipe 52 connects the inert gas supply unit 51 and a purging target area 20p of the flow path R. The purging target area 20p exemplified in this embodiment is the supply pipe 21 on the combustion device 8 side of the on-off valve 23, the return pipe 22 on the combustion device 8 side of the on-off valve 24, and the flow path R formed within the combustion device 8. The inert gas supply pipe 52 exemplified in this embodiment is connected to the purging target area 20p of the supply pipe 21 within the purging target area 20p.

The inert gas supply valve 53 is provided in the inert gas supply pipe 52. The inert gas supply valve 53 is normally closed, blocking the supply of inert gas from the inert gas supply unit 51 to the purging area 20p. Here, normal operation refers to a time when ammonia can be supplied to the combustion device 8, such as when the combustion device 8 is operating. During this normal operation, the on-off valves 23 and 24 are open, allowing ammonia to be supplied from the ammonia buffer tank 40 to the combustion device 8 through the supply pipe 21, and excess ammonia is returned from the combustion device 8 to the ammonia buffer tank 40.

The inert gas supply valve 53 is switched from a closed state to an open state during an emergency shutdown or long-term shutdown of the combustion device 8. In other words, it is operated from a closed state to an open state when purging ammonia remaining in the purge target area 20p. At this time, the supply of ammonia from the ammonia buffer tank 40 to the combustion device 8 is stopped. In this embodiment, the on-off valves 23 and 24 are closed. Next, when the inert gas supply valve 53 is switched from a closed state to an open state, inert gas can be supplied from the inert gas supply unit 51 to the purge target area 20p. Note that, if residual liquid ammonia is to be returned to the ammonia buffer tank 40 at the beginning of the purge, the on-off valves 23 and 24 may be opened as appropriate.

The residual ammonia supply line 25 is branched off from the return pipe 22. In this embodiment, the residual ammonia supply line 25 branches off from the return pipe 22 between the on-off valve 24 and the combustion device 8. The residual ammonia supply line 25 guides liquid ammonia purged by the inert gas supply device 50, as well as a mixed fluid of liquid ammonia purged by the inert gas supply device 50, gaseous ammonia, and inert gas, to the ammonia detoxification device 60.

The residual ammonia supply line 25 includes a residual ammonia supply line main body 26, a temporary ammonia storage section 27, and an on-off valve 28. The residual ammonia supply line main body 26 is a pipe connecting the return pipe 22 and the temporary ammonia storage section 27. The temporary ammonia storage section 27 separates the liquid and gas introduced by the residual ammonia supply line main body 26, or vaporizes the liquid. In other words, the temporary ammonia storage section 27 vaporizes the liquid ammonia introduced by the residual ammonia supply line main body 26 and the liquid ammonia contained in the mixed fluid introduced by the residual ammonia supply line main body 26.

The on-off valve 28 is normally closed and is switched from the closed state to the open state when purging using the inert gas supply device 50 is performed.

(Configuration of ammonia detoxification device)
The ammonia detoxification device 60 includes an ammonia introduction section 61, an absorption liquid introduction section 62, a reactor 63, an ammonia absorption liquid discharge line 64, a recovery tank 65, a gas-phase ammonia concentration adjustment section 66, an atmosphere release line 70, an exhaust gas dilution section 73, and an ammonia absorption liquid supply line 80.

The ammonia introduction section 61 is configured to be able to introduce ammonia from within the floating body main body 2 into the reactor 63. In this embodiment, the ammonia introduction section 61 introduces ammonia from the ammonia temporary storage section 27 into the reactor 63. More specifically, it introduces a mixed fluid of ammonia gas and an inert gas from the ammonia temporary storage section 27 into the reactor 63. Here, the ammonia introduction section 61 uses the pressure of the inert gas from the inert gas supply device 50 to introduce the mixed fluid into the reactor 63.

The absorbing liquid introduction section 62 is configured to be able to introduce an absorbing liquid capable of absorbing ammonia into the reactor 63. The absorbing liquid introduction section 62 of this embodiment introduces water as the absorbing liquid into the reactor 63. Here, examples of the absorbing liquid include seawater and fresh water. Furthermore, examples of seawater include seawater around where the floating body 2 floats, and examples of fresh water include fresh water stored in a fresh water tank (not shown) of the floating body 2. The absorbing liquid introduction section 62 of this embodiment uses water (e.g., seawater or fresh water) around where the floating body 2 floats, pumped up by a pump (not shown), as the absorbing liquid.

The reactor 63 produces an ammonia-absorbed solution W by reacting the ammonia introduced through the ammonia introduction section 61 with the absorbing solution introduced through the absorbing solution introduction section 62. Examples of the reactor 63 include an absorption tower and a microreactor. This reactor 63 is capable of actively absorbing ammonia into the absorbing solution. In other words, the reactor 63 has the function of increasing the ammonia solubility in the ammonia-absorbed solution W. In other words, the reactor 63 can produce an ammonia-absorbed solution W in which ammonia is concentrated.

The reactor 63 illustrated in this embodiment includes multiple reaction accelerators 63t arranged vertically. The absorption liquid is supplied to the uppermost reaction accelerator 63t, and any absorption liquid overflowing from the uppermost reaction accelerator 63t moves to the reaction accelerator 63t located immediately below. The absorption liquid then overflows from the upper reaction accelerators 63t and moves to the lower reaction accelerators 63t. Each time the absorption liquid overflows and flows down, the absorption liquid comes into contact with ammonia gas, and the ammonia gas is absorbed by the absorption liquid. This results in a higher ammonia solubility in the absorption liquid in the lower reaction accelerators 63t. The absorption liquid overflowing from the lowermost reaction accelerator 63t is discharged from the bottom of the reactor 63 as ammonia absorption liquid W that has absorbed ammonia. The internal space of the reactor 63 in this first embodiment is at normal pressure (in other words, atmospheric pressure) or a slightly negative pressure.

On the other hand, an inert gas discharge line 77 is provided at the top of the reactor 63 for discharging the inert gas contained in the mixed fluid introduced into the reactor 63. In this embodiment, the inert gas discharge line 77 is connected to, for example, a vent post, and the inert gas discharged through the inert gas discharge line 77 is released into the atmosphere. For example, if there is a possibility that the concentration of ammonia gas mixed into the inert gas discharged through the inert gas discharge line 77 will increase, the inert gas discharge line 77 may be connected to another small-scale abatement device, such as a catalytic decomposition device, to abatement the ammonia before releasing it into the atmosphere. Note that, for example, if the reactor 63 is a microreactor, the above-mentioned inert gas discharge line 77 can be omitted.

The ammonia absorbent discharge line 64 guides the ammonia absorbent W discharged from the reactor 63 to the recovery tank 65. While this embodiment illustrates a case in which the ammonia absorbent discharge line 64 is connected to the ceiling wall 65a of the recovery tank 65, the ammonia absorbent discharge line 64 may be configured to introduce and store the ammonia absorbent W in the recovery tank 65, and is not limited to being connected to the ceiling wall 65a of the recovery tank 65.

The ammonia absorbing solution W produced in the reactor 63 and discharged from the reactor 63 is introduced into the recovery tank 65. The recovery tank 65 is capable of storing the introduced ammonia absorbing solution W. The recovery tank 65 is provided in the floating body 2. The recovery tank 65 illustrated in this embodiment uses a ballast tank provided in the floating body 2.

The recovery tank 65 contains an ammonia absorption liquid W (liquid phase) and a gas phase. The recovery tank 65 in this embodiment is a so-called atmospheric pressure tank, and the pressure of the gas phase is normally atmospheric pressure. As described above, the recovery tank 65 in this embodiment is a ballast tank, so liquids such as water stored in the recovery tank 65 can be released into the water surrounding the floating body main body 2 via a ballast water treatment device (not shown) or the like. The recovery tank 65 is not limited to a ballast tank. For example, the recovery tank 65 may be a seawater tank or fresh water tank provided separately from the ballast tank. The recovery tank 65 may also be empty when not in use.

The gas-phase ammonia concentration adjustment unit 66 adjusts the ammonia concentration in the gas phase of the recovery tank 65. In other words, the gas-phase ammonia concentration adjustment unit 66 is capable of adjusting the solubility of ammonia in the ammonia absorbing solution W by adjusting the ammonia concentration in the gas phase. Here, the gas phase of the recovery tank 65 and the ammonia absorbing solution W (liquid phase) attempt to reach a gas-liquid equilibrium state. In other words, as the ammonia solubility in the ammonia absorbing solution W increases, the ammonia concentration in the gas phase also gradually increases. On the other hand, if the ammonia concentration in the gas phase decreases, the partial pressure difference causes ammonia in the liquid phase to dissipate and be sequentially supplied to the gas phase, thereby decreasing the ammonia solubility in the ammonia absorbing solution W.

The gas-phase ammonia concentration adjustment unit 66 includes a first diluted gas supply line 67, a first blower 68, and a first valve 69. The first diluted gas supply line 67 is a pipe capable of introducing air or an inert gas into the gas phase of the recovery tank 65. In this embodiment, the first diluted gas supply line 67 is capable of introducing air into the gas phase of the recovery tank 65. The upper end of the first diluted gas supply line 67 opens, for example, above the upper deck 7, and the lower end of the first diluted gas supply line 67 is connected to the ceiling wall 65a of the recovery tank 65. Note that when the first diluted gas supply line 67 introduces an inert gas, it may be configured to supply inert gas from the inert gas supply device 50 or inert gas discharged through the inert gas discharge line 77.

The first blower 68 is provided midway along the first dilution gas supply line 67 and sends the air or inert gas from the first dilution gas supply line 67 toward the recovery tank 65. The first blower 68 may be, for example, a variable speed blower. The first valve 69 is provided midway along the first dilution gas supply line 67 and opens and closes the flow path of the first dilution gas supply line 67. Note that the first blower 68 may also be a blower that operates at a constant speed. In this case, the first valve 69 may be an adjustable valve so that the flow rate of air supplied into the recovery tank 65 can be adjusted.

The gas-phase ammonia concentration adjustment unit 66 configured in this manner adjusts the ammonia concentration in the gas phase of the recovery tank 65 to a predetermined ammonia concentration range (e.g., 0 to 10 vol%) that is lower than the saturated state.

The atmosphere release line 70 allows the gas phase within the recovery tank 65 to be released to the atmosphere. In this embodiment, the atmosphere release line 70 also serves as an air vent pipe for the recovery tank 65, which is a ballast tank. In this embodiment, the atmosphere release line 70 has a release line main body 71, which is a pipe, and an atmosphere release valve 72 that opens and closes the flow path within the release line main body 71. The lower end of the release line main body 71 is connected to the ceiling wall 65a of the recovery tank 65, and the upper end of the release line main body 71 opens above the upper deck 7. In this first embodiment, the atmosphere release valve 72 is always open. Note that the atmosphere release valve 72 may be provided as needed, or may be omitted.

The exhaust gas dilution unit 73 is configured to dilute the gas phase gas in the recovery tank 65, which is released into the atmosphere via the atmosphere release line 70, with dilution gas. In this embodiment, the exhaust gas dilution unit 73 includes a second dilution gas supply line 74, a second blower 75, and a second valve 76. This exhaust gas dilution unit 73 has the same configuration as the gas phase ammonia concentration adjustment unit 66 described above. The second dilution gas supply line 74 is a pipe capable of introducing air or an inert gas into the atmosphere release line 70. In this embodiment, the second dilution gas supply line 74 is capable of introducing air into the atmosphere release line 70. One end of the second dilution gas supply line 74 opens, for example, above the upper deck 7, and the other end of the second dilution gas supply line 74 is joined and connected midway through the atmosphere release line 70. When the second dilution gas supply line 74 introduces inert gas, the inert gas may be supplied from the inert gas supply device 50, or the inert gas discharged through the inert gas discharge line 77. The discharge gas dilution unit 73 may be provided as needed, and may be omitted if the ammonia concentration of the gas flowing through the atmosphere release line 70 has been sufficiently reduced.

The ammonia absorbent supply line 80 is capable of supplying the ammonia absorbent W stored in the recovery tank 65 to the outside of the recovery tank 65. Examples of destinations to which the ammonia absorbent W can be supplied via the ammonia absorbent supply line 80 include other ammonia detoxification devices, other storage tanks, and bunkering stations for unloading.

(Action and effect)
The float 1 of the first embodiment described above includes a float body 2 floating on water, an ammonia introduction section 61 into which ammonia in the float body 2 can be introduced, an absorbing liquid introduction section 62 into which an absorbing liquid capable of absorbing ammonia can be introduced, a reactor 63 that produces an ammonia absorbing liquid W by reacting ammonia from the ammonia introduction section 61 with the absorbing liquid from the absorbing liquid introduction section 62, a recovery tank 65 into which the ammonia absorbing liquid W produced in the reactor 63 and discharged from the reactor 63 is introduced and in which the ammonia absorbing liquid W can be stored, and an atmosphere release line 70 that can release the gas phase in the recovery tank 65 to the atmosphere.

By doing this, the reactor 63 can absorb the ammonia in the floating body 2 into the absorbing liquid. The ammonia-absorbed ammonia absorbing liquid W can then be stored in the recovery tank 65, and the ammonia can be gradually released from the ammonia absorbing liquid W in the recovery tank 65 into the gas phase, allowing the gas with a low ammonia concentration to be released into the atmosphere through the atmosphere release line 70. Furthermore, the reactor 63 can increase the ammonia solubility in the ammonia absorbing liquid W without being affected by, for example, the partial pressure difference between the gas and liquid in the recovery tank 65, thereby preventing the recovery tank 65 that stores the ammonia absorbing liquid W from becoming larger.

In addition, in the recovery tank 65, the partial pressure difference between the liquid phase and the gas phase is utilized to dissipate most of the ammonia absorbed in the ammonia absorbent solution W into the gas phase, thereby substantially detoxifying the ammonia absorbent solution W, which eliminates the need to remove ammonia in the ammonia absorbent solution W using an acid such as dilute sulfuric acid.
Furthermore, a pilot flame for burning and detoxifying ammonia is no longer necessary.
Therefore, the ammonia absorbing solution W can be detoxified while suppressing an increase in the burden on workers and fuel consumption.

The floating body 1 of the first embodiment is provided with a gas phase ammonia concentration adjusting unit 66 that adjusts the ammonia concentration in the gas phase of the recovery tank 65 .
This makes it possible to adjust the speed at which ammonia absorbed in the ammonia-absorbing solution W is stripped into the gas phase. For example, if the ammonia concentration in the gas phase is reduced, the partial pressure difference between the gas and liquid increases, and the ammonia absorbed in the ammonia-absorbing solution W is quickly stripped into the gas phase, resulting in a decrease in the solubility of ammonia in the ammonia-absorbing solution W. This makes it possible to speed up the stripping of ammonia from the ammonia-absorbing solution W into the gas phase. Furthermore, if the ammonia concentration in the gas phase is increased, the partial pressure difference between the gas and liquid decreases, and the ammonia absorbed in the ammonia-absorbing solution W remains in the ammonia-absorbing solution W. This makes it possible to delay the stripping of ammonia from the ammonia-absorbing solution W into the gas phase.

In the first embodiment, the exhaust gas dilution section 73 is further provided.
For example, immediately after the gas-phase ammonia concentration adjusting unit 66 starts supplying air or an inert gas to the gas phase, gas with a relatively high ammonia concentration may be introduced into the atmosphere vent line 70. However, since the second valve 76 of the exhaust gas dilution unit 73 can be opened and air can be merged by the second blower 75, it is possible to prevent gas with a high ammonia concentration from being released into the atmosphere. Furthermore, when the ammonia concentration of the gas introduced into the atmosphere vent line 70 is not high, the second blower 75 of the exhaust gas dilution unit 73 can be stopped and the second valve 76 can be closed, thereby achieving energy savings.

In the first embodiment, the ammonia introducing section 61 further introduces the ammonia discharged through the residual ammonia supply line 25 into the reactor 63 .
Thus, even ammonia discharged by purging, which is generated irregularly and needs to be completed in a short time, can be absorbed into the absorbing liquid, stored in the recovery tank 65 as the ammonia absorbing liquid W, and then gradually released into the gas phase. This eliminates the need to quickly detoxify the ammonia discharged through the residual ammonia supply line 25. Therefore, ammonia can be detoxified without using a large-scale treatment device, which prevents the ammonia detoxification device 60 and the floating body 1 from becoming too large.

In the first embodiment described above, an ammonia absorbing liquid supply line 80 is provided. This allows the ammonia absorbing liquid W stored in the recovery tank 65 to be supplied to the outside of the recovery tank 65. For example, when the float 1 is at port, the ammonia absorbing liquid W can be unloaded and quickly treated for detoxification. Furthermore, by supplying the ammonia absorbing liquid W to equipment that uses ammonia within the float 1 via the ammonia absorbing liquid supply line 80, the ammonia absorbing liquid W can be effectively utilized.

(First Modification of First Embodiment)
In the above first embodiment, a case has been described in which an operator operates the gas-phase ammonia concentration adjusting unit 66, the discharge gas dilution unit 73, and the atmosphere release valve 72. However, the ammonia concentration in the open line main body 71 of the atmosphere release line 70, the ammonia concentration in the gas phase of the recovery tank 65, and the ammonia solubility (in other words, the ammonia concentration) in the ammonia absorbing solution W may be detected by sensors, and based on the detection results of these ammonia solubilities, for example, opening and closing the first valve 69, the second valve, and the atmosphere release valve 72, adjusting the amount of air or inert gas supplied by the first blower 68 and the second blower, etc. may be automatically performed by a control device.

(Second Modification of First Embodiment)
In the first embodiment described above, the gas-phase ammonia concentration adjusting unit 66 adjusts the ammonia concentration in the gas phase by forcing air into the gas phase of the recovery tank 65 using the first blower 68. However, the configuration for adjusting the ammonia concentration in the gas phase is not limited to that of the first embodiment. A second modified example of the first embodiment will be described below with reference to the drawings. In the description of this second modified example, the same parts as those in the first embodiment described above will be assigned the same reference numerals, and duplicated description will be omitted. Figure 3 is a view corresponding to Figure 2 in the second modified example of the first embodiment of the present disclosure.

As shown in FIG. 3, the float 1 of this second modified example is equipped with a gas-phase ammonia concentration adjustment unit 166 instead of the exhaust gas dilution unit 73 and gas-phase ammonia concentration adjustment unit 66 of the first embodiment. This gas-phase ammonia concentration adjustment unit 166 is equipped with a first diluted gas supply line 167 and a first valve 69. Note that the first diluted gas supply line 167 of this second modified example differs from the first diluted gas supply line 67 of the first embodiment only in that it does not have a first blower 68. Similarly, the second diluted gas supply line 174 differs from the second diluted gas supply line 74 of the first embodiment only in that it does not have a second blower 75.

The atmosphere release line 170 includes a release line main body 71, an atmosphere release valve 72, and a third blower 81. That is, the atmosphere release line 170 in this second modified example differs from the atmosphere release line 170 in the first embodiment in that it includes the third blower 81.
The third blower 81 is provided midway through the open line main body 71 of the atmosphere vent line 170 and is capable of sucking in gas phase gas and sending it out into the atmosphere. The second dilution gas supply line 174 is joined to the open line main body 71 between the third blower 81 and the recovery tank 65. The second dilution gas supply line 174 is capable of joining air or an inert gas to the gas flowing in the atmosphere vent line 70. The second valve 76 opens and closes the flow path in the second dilution gas supply line 174.

In the second modification of the first embodiment, similar to the first embodiment, ammonia is absorbed into the absorption liquid by the reactor 63 to produce the ammonia absorption liquid W. This ammonia absorption liquid W is then stored in the recovery tank 65, and the ammonia absorbed in the ammonia absorption liquid W stored in this recovery tank 65 gradually dissipates into the gas phase due to the partial pressure difference between the gas and liquid.

When the third blower 81 is operated from the above state, the gas in the gas phase is sucked in through the atmosphere vent line 170. At this time, the first valve 69 of the first dilution gas supply line 167 is opened, and air or inert gas is drawn into the gas phase of the recovery tank 65. This reduces the ammonia concentration in the gas phase. On the other hand, when the third blower 81 is stopped, the ammonia concentration in the gas phase is maintained.

Furthermore, if the ammonia concentration of the gas phase that has flowed into the flow path of the atmosphere release line 170 is high, the second valve 76 can be opened to allow air or an inert gas to merge with the gas phase that has flowed into the atmosphere release line 70. This prevents gas with a high ammonia concentration from being released into the atmosphere. Therefore, according to this second modified example, it is possible to adjust the solubility of the ammonia absorption solution W in the same way as in the first embodiment, while reducing the number of blowers compared to the first embodiment.

(Third Modification of the First Embodiment)
In the first embodiment, when the ammonia concentration of the mixed gas introduced by the ammonia introducing part 61 is high, the ammonia gas may be absorbed by the absorbing liquid, causing the pressure of the internal space of the reactor 63 to become lower than atmospheric pressure (in other words, negative pressure). In such a case, a fluid flows back from the recovery tank 65, whose gas phase is at normal pressure, to the reactor 63 via the ammonia absorbing liquid discharge line 64. Therefore, in order to prevent this backflow, a check valve may be provided in the ammonia absorbing liquid discharge line 64, or a pressure equalizing device may be provided to equalize the pressure in the internal space of the reactor 63 and the pressure of the gas phase in the recovery tank 65.

(Fourth Modification of the First Embodiment)
In the above-described first embodiment, the case where the recovery tank 65 is a ballast tank, which is an atmospheric pressure tank, has been described as an example. Furthermore, the case where the internal space of the reactor 63 is at approximately atmospheric pressure or negative pressure has been described. However, the configuration of the recovery tank 65 and the reactor 63 is not limited to these. Below, a fourth modified example of the first embodiment will be described with reference to the drawings. Note that in the description of this fourth modified example, the same parts as those in the above-described first embodiment are denoted by the same reference numerals, and redundant description will be omitted. Figure 4 is a view corresponding to Figure 2 of the fourth modified example of the first embodiment of the present disclosure.

As shown in FIG. 4 , the float 1 of this fourth modified example replaces the reactor 63 of the first embodiment with a pressurized reactor 163. The reactor 163 is provided with a first pressure sensor 90, and the inert gas discharge line 77 is provided with an inert gas discharge valve 91 whose opening can be adjusted based on the detection results of the first pressure sensor 90. In this fourth modified example, the first pressure sensor 90 and the inert gas discharge valve 91 preset the pressure in the internal space of the reactor 163 to a predetermined pressure higher than the gas phase pressure in the recovery tank 165. Furthermore, the absorbent liquid introduction section 62 is provided with an absorbent liquid introduction valve 92, which prevents gas inside the reactor 163 from flowing into the absorbent liquid introduction section 62 when the absorbent liquid is not being introduced into the reactor 163. The first pressure sensor 90 and the inert gas discharge valve 91 described above constitute the first pressure adjustment section of the present disclosure.

In the floating body 1 of this fourth modified example, the recovery tank 65 of the first embodiment is replaced with a pressurized recovery tank 165. Also, in this fourth modified example, the first blower 68 of the first embodiment is replaced with a first compressor 168.

According to the float 1 of the fourth modified example of the first embodiment, the first valve 69 and the atmosphere release valve 72 are first closed. The inert gas exhaust valve 91 is initially closed and functions as a so-called relief valve that opens when the pressure in the internal space of the reactor 163 reaches a predetermined upper limit.

In this state, when a mixed gas containing ammonia gas is introduced into the reactor 163 by the ammonia introduction section 61, the pressure in the internal space of the reactor 163 gradually increases. When the pressure in the internal space of the reactor 163 reaches a predetermined pressure, the absorption liquid introduction valve 92 is opened to introduce the absorption liquid into the reactor 163. As a result, ammonia is absorbed into the absorption liquid in a high-pressure environment higher than atmospheric pressure, and an ammonia absorption liquid W is produced. The ammonia solubility of the ammonia absorption liquid W produced in this high-pressure environment is higher than the ammonia solubility of the ammonia absorption liquid W produced at atmospheric pressure. This ammonia absorption liquid W is stored in the recovery tank 165 via the ammonia absorption liquid discharge line 64.

Meanwhile, in the recovery tank 165, the first valve 69 is open, and air or an inert gas is pressurized and delivered to the recovery tank 165 by the first compressor 168. The gas phase pressure in the recovery tank 165 is set to a predetermined pressure that is, for example, higher than atmospheric pressure and lower than the pressure in the internal space of the reactor 163. In other words, by keeping the pressure inside the recovery tank 165 higher than atmospheric pressure, it is possible to maintain a state in which the solubility of ammonia in the ammonia absorption solution W is increased. In the fourth modified example, the first dilution gas supply line 67, the first compressor 168, and the first valve 69 constitute a gas phase ammonia concentration adjustment unit 166. The atmosphere release valve 72 and the first compressor 168 constitute a second pressure adjustment unit of the present disclosure.

According to this fourth modification, by creating a high-pressure environment in the internal space of the reactor 163, the ammonia solubility of the ammonia absorption solution W produced in the reactor 163 can be increased. This makes it possible to absorb more ammonia in the same amount of absorption solution. Therefore, if the size of the recovery tank 165 is kept constant, it becomes possible to temporarily store more ammonia in the recovery tank 165.

Furthermore, by making the flow rate of the exhaust gas discharged from the collection tank 165 smaller than the flow rate of the diluted gas introduced into the collection tank 165, for example by adjusting the opening of the atmosphere release valve 72 and the opening of the first valve 69, it is possible to release the gas phase gas into the atmosphere via the atmosphere release line 70 while maintaining the pressure inside the collection tank 165 at a level higher than atmospheric pressure.

In this fourth variant, as in the first embodiment described above, the gas flowing into the atmosphere release line 70 can be diluted by the exhaust gas dilution section 73.

(Fifth Modification of the First Embodiment)
In the above-described first embodiment, a configuration has been described in which the gas-phase ammonia concentration adjusting unit 66 adjusts the ammonia concentration in the gas phase of the recovery tank 65, thereby adjusting the ammonia solubility in the ammonia absorbent solution W. In addition, in the above-described fourth modified example of the first embodiment, a case has been described in which the gas-phase ammonia concentration adjusting unit 166 adjusts the pressure in the gas phase of the recovery tank 65, thereby adjusting the ammonia solubility in the ammonia absorbent solution W. However, the configuration for adjusting the ammonia solubility in the ammonia absorbent solution W stored in the recovery tank 65 is not limited to the configurations of the first embodiment and the fourth modified example of the first embodiment.

FIG. 5 is a diagram corresponding to FIG. 2 in a fifth modified example of the first embodiment of the present disclosure.
For example, as in a fifth modified example shown in Fig. 5 , an absorption solution temperature adjusting unit 82 that adjusts the temperature of the ammonia absorbing solution W may be provided as a configuration for adjusting the solubility of ammonia. This absorption solution temperature adjusting unit 82 is capable of performing at least one of heating the ammonia absorbing solution W and cooling the ammonia absorbing solution W. When the temperature of the ammonia absorbing solution W is high, the rate at which ammonia absorbed in the ammonia absorbing solution W diffuses into the gas phase can be increased, while when the temperature of the ammonia absorbing solution W is low, the rate at which ammonia absorbed in the ammonia absorbing solution W diffuses into the gas phase can be decreased.

(Another modification of the first embodiment)
In the above-described fifth modified example, a configuration has been described in which the solubility of the ammonia absorbent solution W can be adjusted by adjusting the ammonia diffusion rate of the ammonia absorbent solution W by adjusting the temperature of the ammonia absorbent solution W. However, the configuration for adjusting the ammonia solubility of the ammonia absorbent solution W is not limited to the configuration of the fifth modified example. For example, the ammonia solubility may be adjusted by adjusting the pH of the ammonia absorbent solution W or by introducing a weakly acidic liquid or gas into the gas phase. Furthermore, the solubility of ammonia may be adjusted by appropriately combining the configuration for adjusting the ammonia concentration of the gas phase, the configuration for adjusting the temperature of the ammonia absorbent solution W, the configuration for adjusting the pH of the ammonia absorbent solution W, the configuration for adjusting the pH of the gas phase, and the configuration for adjusting the pressure of the gas phase.

[Second embodiment]
Next, a floating body 1 according to a second embodiment of the present disclosure will be described with reference to the drawings. This second embodiment differs only in that batch processing is enabled in the reactor of the fourth modified example of the first embodiment described above. Therefore, in this second embodiment, FIG. 1 will be used, and the same parts as those of the fourth modified example of the first embodiment described above will be denoted by the same reference numerals, and redundant description will be omitted.

FIG. 6 is a diagram corresponding to FIG. 5 in the second embodiment of the present disclosure.
The float 1 of the second embodiment includes a float body 2 , an upper structure 4 , a combustion device 8 , an ammonia tank 10 , a piping system 20 , a compartment 30 , and an ammonia detoxification device 160 .
6, the ammonia detoxification device 160 includes an ammonia introduction section 61, an absorbent introduction section 62, a reactor 163, a recirculation line 93, an ammonia absorbent discharge line 164, a recovery tank 165, a gas-phase ammonia concentration adjusting section 166, an open-to-air line 70, an exhaust gas dilution section 73, and an ammonia absorbent supply line 80. Note that the configurations of the ammonia introduction section 61, the absorbent introduction section 62, the reactor 163, the recovery tank 165, the gas-phase ammonia concentration adjusting section 66, the open-to-air line 70, the exhaust gas dilution section 73, and the ammonia absorbent supply line 80 are the same as those of the fourth modified example of the first embodiment, and therefore detailed description thereof will be omitted.

The recirculation line 93 returns the ammonia absorption solution W produced in the reactor 163 to the absorption solution introduction section 62. The recirculation line 93 is equipped with a recirculation line main body 94, a first recirculation valve 95, a second recirculation valve 96, and a recirculation pump 97. The recirculation line main body 94 is a pipe that guides the ammonia absorption solution W, and one end of the recirculation line main body 94 is connected to the bottom of the reactor 163. The other end of the recirculation line 93 is connected to and merges with the absorption solution introduction section 62. The recirculation pump 97 is provided midway along the recirculation line main body 94 and is capable of delivering the ammonia absorption solution W from the reactor 163 to the absorption solution introduction section 62. A first recirculation valve 95 is provided in the recirculation line main body 94 on one end side of the recirculation pump 97, and a second recirculation valve 96 is provided in the recirculation line main body 94 on the other end side.

The recirculation pump 97 is driven only when the ammonia absorption solution W is being recirculated. Furthermore, the first recirculation valve 95 and the second recirculation valve 96 are opened only when the ammonia absorption solution W is being recirculated, and are closed at all other times.

The ammonia absorption solution discharge line 164 guides the ammonia absorption solution W discharged from the reactor 163 to the recovery tank 165. The ammonia absorption solution discharge line 164 is equipped with a discharge line main body 98 and a discharge valve 99. The discharge line main body 98 is a pipe that guides the ammonia absorption solution W and is connected to a branch of the recirculation line main body 94 between the first recirculation valve 95 and the reactor 163. The discharge valve 99 opens and closes the flow path of the discharge line main body 98. The discharge valve 99 is opened only when the ammonia absorption solution W is being guided to the recovery tank 165, and is closed at other times, for example, when the ammonia absorption solution W is being recirculated via the recirculation line 93.

The absorbing liquid introduction section 62 has an absorbing liquid introduction valve 92 located upstream of the other end of the recirculation line main body 94 in the flow direction of the absorbing liquid. This absorbing liquid introduction valve 92 is closed when recirculation is taking place through the recirculation line 93. This prevents the ammonia absorbing liquid W that flows in from the recirculation line main body 94 from flowing back upstream of the absorbing liquid introduction section 62. Note that a check valve or the like may be provided instead of the absorbing liquid introduction valve 92.

This second embodiment further includes a pH detection unit 100 that measures the pH as a state quantity of the ammonia absorption solution W produced in the reactor 163, and a liquid level detection unit 101 that measures the liquid level as a state quantity of the ammonia absorption solution W in the reactor 63. The first recirculation valve 95, second recirculation valve 96, recirculation pump 97, discharge valve 99, and absorption solution introduction valve 92 described above are controlled based on the measurement results of the pH detection unit 100 and liquid level detection unit 101. In this second embodiment, the pH detection unit 100, liquid level detection unit 101, and switching control unit (not shown) are integrally formed, and this switching control unit controls the opening and closing of the first recirculation valve 95, second recirculation valve 96, discharge valve 99, and absorption solution introduction valve 92, as well as the drive control of the recirculation pump 97.

The ammonia solubility of the ammonia absorbing solution W produced by the reactor 163 can be determined, for example, based on the measurement results of the pH detection unit 100, using a table, map, formula, or the like of ammonia solubility and pH determined in advance through experiments, simulations, or the like. The switching control unit recirculates the ammonia absorbing solution W through the recirculation line 93 until the determined ammonia solubility reaches or exceeds a predetermined level and the liquid level of the ammonia absorbing solution W reaches or exceeds a predetermined level. On the other hand, once the ammonia solubility reaches or exceeds a predetermined level and the liquid level of the ammonia absorbing solution W reaches or exceeds a predetermined level, the switching control unit causes the ammonia absorbing solution W to flow into the ammonia absorbing solution discharge line 164 instead of the recirculation line 93, and introduces the ammonia absorbing solution W into the recovery tank 165.

(Action and effect)
According to the second embodiment, it is possible to further increase the ammonia solubility in the ammonia absorbing solution W and concentrate ammonia to a high concentration. As a result, it is possible to reduce the amount of the absorbing solution used to absorb ammonia.

In the description of this second embodiment, an example was given in which a configuration for performing batch processing in the reactor 163 was added to the configuration of the fourth modified example of the first embodiment, but a configuration for performing batch processing may also be added to the configurations of the first embodiment and the first to fifth modified examples of the first embodiment. Furthermore, while the case in which the ammonia absorption solution W is recirculated via the recirculation line 93 was described, the ammonia absorption solution W recovered in the recovery tank 165 may also be returned to the absorption solution introduction section 62. In this case, ammonia absorption solution W with the desired ammonia concentration can be easily obtained in conjunction with the release of ammonia into the gas phase of the recovery tank 165, which is advantageous when using the ammonia absorption solution W in other devices.

[Third embodiment]
Next, a floating body 1 according to a third embodiment of the present disclosure will be described with reference to the drawings. This third embodiment differs from the first embodiment described above only in that ammonia leaked in the compartment 30 housing the ammonia-related equipment is introduced into the reactor. Therefore, in this third embodiment, FIG. 1 will be used, and the same parts as those in the first embodiment described above will be denoted by the same reference numerals, and redundant description will be omitted.

FIG. 7 is a diagram corresponding to FIG. 2 in the third embodiment of the present disclosure.
The float 1 of the third embodiment includes a float body 2 , an upper structure 4 , a combustion device 8 , an ammonia tank 10 , a piping system 20 , a compartment 30 , and an ammonia detoxification device 260 .

As shown in Figure 7, the ammonia detoxification device 260 includes a recovery tank 65, an ammonia introduction section 261, a gas-phase ammonia concentration adjustment section 66, and an exhaust gas dilution section 73.

The ammonia introduction section 261, like the ammonia introduction section 61 of the first embodiment, introduces ammonia from within the floating body 2 into the reactor 63. The ammonia introduction section 261 of this third embodiment is capable of communicating with the compartment 30. The ammonia introduction section 261 is configured to be able to introduce gaseous ammonia that has leaked and evaporated within the compartment 30 into the reactor 63 as ammonia from within the floating body 2. The floating body 1 of this third embodiment is provided with an air intake system 31 and an exhaust system 32 for ventilating the compartment 30. The air intake system 31 includes an air intake damper 33 and an air intake duct 34. The exhaust system 32 includes an exhaust damper 35 and an exhaust duct 36.

The ammonia introduction section 261 includes a line main body 37, an introduction blower 38, an introduction blower inlet damper 39, and an introduction damper 41. The line main body 37 is a pipe having an internal flow path. The introduction blower 38 is provided midway along the line main body 37 and sends the gas in the line main body 37 toward the reactor 63. The introduction blower 38 is constantly operating. For example, a variable-speed blower can be used as the introduction blower 38.

The intake fan inlet damper 39 is provided on the inlet side of the line body 37, closer to the compartment 30 than the intake fan 38, and opens and closes the flow path of the line body 37. The intake damper 41 is provided on the line body 37 between the intake fan 38 and the reactor 63, and opens and closes the flow path of the line body 37.

For example, under normal circumstances when no ammonia leak is occurring within compartment 30, workers open the exhaust damper 35, intake fan inlet damper 39, and intake damper 33, and close the intake damper 41. This allows outside air to be drawn into compartment 30 from the air intake equipment 31, and the air within compartment 30 is released to the outside of the floating body 2 through the line main body 37 and exhaust duct 36. In other words, compartment 30 is ventilated.

On the other hand, if an ammonia leak occurs within compartment 30, for example, an operator closes exhaust damper 35 and opens intake damper 33, intake blower inlet damper 39, and intake damper 41. At this time, at least one of the opening degrees of intake damper 33, intake blower inlet damper 39, and intake damper 41 and the rotation speed (in other words, air volume) of intake blower 38 are adjusted so that the pressure within compartment 30 is lower than atmospheric pressure. By lowering the pressure within compartment 30 below atmospheric pressure in this way, ammonia leakage outside compartment 30 is suppressed.

(Action and effect)
The ammonia introducing part 261 of the third embodiment introduces ammonia leaked in the compartment 30 into the reactor 63. Therefore, it is possible to remove the ammonia leaked in the compartment 30 and detoxify the ammonia absorbing solution W that has absorbed ammonia. As a result, it is possible to detoxify the ammonia absorbing solution W that has absorbed ammonia while suppressing an increase in the burden on workers and fuel consumption. Furthermore, by branching and connecting the exhaust duct 36 of the exhaust equipment 32 to the line main body 37, it is possible to ventilate the compartment 30 and remove ammonia from the compartment 30 with a single introduction blower 38. Therefore, it is possible to suppress an increase in the number of parts.

(Modification of the third embodiment)
In the third embodiment described above, the exhaust duct 36 of the exhaust equipment 32 is branched and connected to the line main body 37 of the ammonia introduction part 261. However, the configuration of the exhaust equipment is not limited to that of the third embodiment. For example, another exhaust equipment having an exhaust fan may be directly connected to the compartment 30. In addition, in the third embodiment, the case where the introduction blower inlet damper 39 is provided in the line main body 37 has been described, but the introduction blower inlet damper 39 may be omitted. In addition, in the third embodiment, the configuration in which the ammonia introduction part 61 of the ammonia detoxification apparatus 60 of the first embodiment has been replaced with the ammonia introduction part 261 has been described as an example. However, the ammonia introduction part 261 is also applicable to each of the modifications of the first embodiment and the second embodiment described above.

[Fourth embodiment]
Next, a float 1 according to a fourth embodiment of the present disclosure will be described with reference to the drawings. This fourth embodiment differs from the above-described embodiments and modifications only in that the ammonia absorption solution W stored in the recovery tank is used for denitrification of the exhaust gas. Therefore, in this fourth embodiment, FIG. 1 will be used, and the same parts as those in the above-described first embodiment will be described with the same reference numerals, and duplicated description will be omitted.

(Configuration of the denitrification device)
FIG. 8 is a diagram showing a piping system around a denitration ammonia solution tank of a denitration apparatus according to a fourth embodiment of the present disclosure.
1 and 8 , the float 1 of the fourth embodiment includes a float body 2, a combustion device 8, an ammonia tank 10, a piping system 20, an ammonia introduction section 61, an absorbing liquid introduction section 62, a reactor 63, a recovery tank 65, an atmosphere release line 70, an exhaust pipe 102, a denitration device 103, a denitration ammonia solution tank 104, a denitration ammonia solution supply line 105, an ammonia absorbing liquid supply line 180, and a liquefied ammonia supply line 106. The combustion device 8 of the fourth embodiment is a main engine that propels the float body 2.

The exhaust pipe 102 guides the exhaust gas G discharged from the combustion device 8 to the outside of the floating body main body 2. The exhaust gas G that flows through this exhaust pipe 102 immediately after being discharged from the combustion device 8 contains nitrogen oxides.

The denitration device 103 denitrifies the exhaust gas G discharged from the combustion device 8. This denitration device 103 is a selective catalytic reduction (SCR) denitration device that uses a catalyst to convert nitrogen oxides into nitrogen and water. The denitration device 103 is installed midway through the exhaust pipe 102, and brings the exhaust gas G sprayed with a denitration ammonia solution into contact with a catalyst (not shown). The denitrified exhaust gas G is then released into the atmosphere, for example, through a funnel (not shown) installed on the floating body 2.

The denitration ammonia solution tank 104 stores the denitration ammonia solution used in the denitration device 103. In this embodiment, the denitration ammonia solution is ammonia water adjusted to a predetermined ammonia concentration (e.g., several tens of percent) required for use as a reducing agent in the denitration device 103. The denitration ammonia solution tank 104 may be equipped with a level gauge or the like to measure the amount of denitration ammonia solution stored therein.

The denitration ammonia solution tank 104 in this embodiment is equipped with a circulation pipe 107 for stirring the denitration ammonia solution and an agitation pump 108. The circulation pipe 107 is equipped with a concentration meter 109 for measuring the ammonia concentration of the denitration ammonia solution stored in the denitration ammonia solution tank 104.

In this fourth embodiment, a configuration in which the denitration ammonia solution is stirred using the circulation piping 107 and the stirring pump 108 has been exemplified. However, it is also possible to provide a different type of stirrer in the denitration ammonia solution tank 104 without providing the circulation piping 107 and the stirring pump 108. Furthermore, the configuration for stirring the denitration ammonia solution as described above may be provided as needed, and may, for example, be omitted. If no configuration for stirring the denitration ammonia solution is provided, a concentration meter 109 for measuring the ammonia concentration of the denitration ammonia solution may be provided in the denitration ammonia solution tank 104.

The denitration ammonia solution supply line 105 forms a flow path that supplies the denitration ammonia solution stored in the denitration ammonia solution tank 104 to the denitration device 103. This denitration ammonia solution supply line 105 is provided with a denitration ammonia solution pump 110.

The ammonia absorption liquid supply line 180 forms a flow path that supplies the ammonia absorption liquid W stored in the recovery tank 65 to the denitration ammonia solution tank 104. This ammonia absorption liquid supply line 180 is provided with an ammonia absorption liquid supply pump 111. The ammonia concentration of the ammonia absorption liquid W stored in the recovery tank 65 is lower (for example, several ppm to several percent) than the ammonia concentration of the denitration ammonia solution described above.

The liquefied ammonia supply line 106 includes a first line 106A that supplies liquefied ammonia stored in the ammonia tank 10 to the ammonia buffer tank 40, and a second line 106B that supplies liquefied ammonia stored in the ammonia tank 10 to the denitration ammonia solution tank 104. As described above, the ammonia stored in the ammonia tank 10 is liquefied ammonia and therefore has a higher ammonia concentration than the ammonia absorbent W. Note that in this embodiment, the second line 106B is illustrated as being branched off from the first line 106A, but the second line 106B may simply supply liquefied ammonia to the denitration ammonia solution tank 104; for example, it may connect the ammonia tank 10 and the denitration ammonia solution tank 104.

In this embodiment, the second line 106B is provided with a flow control valve 112 that can adjust the flow rate of liquefied ammonia flowing from the first line 106A to the second line 106B. This flow control valve 112 is capable of gradually adjusting its valve opening from a fully closed state to a fully open state. The valve opening of the flow control valve 112 may be manually operated by an operator, or may be automatically adjusted by a control device (not shown) based on the ammonia concentration measurement results obtained by the concentration meter 109, for example.

In this embodiment, the first line 106A is provided with a feed pump 113 that feeds liquefied ammonia toward the combustion device 8, on a side closer to the ammonia tank 10 than the branch point P1 of the second line 106B. In other words, the second line 106B illustrated in this embodiment branches off from the first line 106A between the feed pump 113 and the ammonia buffer tank 40. Note that a pump that feeds liquefied ammonia toward the denitrification ammonia solution tank 104 may also be provided in the second line 106B.

Furthermore, the supply pipe 21 of this embodiment is provided with an ammonia pressure pump 114 and an ammonia heat exchanger 115, both of which are not shown in FIG. 2. The ammonia pressure pump 114 pressurizes the ammonia supplied from the ammonia buffer tank 40 to the combustion device 8. The ammonia heat exchanger 115 adjusts the temperature of the ammonia pressurized by the ammonia pressure pump 114. Note that the ammonia buffer tank 40 of this embodiment is connected to the ammonia introduction section 61 via a buffer tank vent pipe 116. This allows the vent gas of the ammonia buffer tank 40 to be supplied to the ammonia detoxification device 60. In other words, the ammonia contained in the vent gas of the ammonia buffer tank 40 can also be absorbed into the absorption liquid by the reactor 63.

(Action and effect)
The float 1 of the fourth embodiment described above includes a combustion device 8 that discharges exhaust gas G by burning fuel, a denitration device 103 that performs denitration treatment on the exhaust gas G discharged from the combustion device 8, a denitration ammonia solution tank 104 that stores a denitration ammonia solution used as a reducing agent in the denitration device 103, and an ammonia absorption liquid supply line 180 that supplies the ammonia absorption liquid W stored in the recovery tank 65 to the denitration ammonia solution tank 104.

With this type of float 1, the ammonia absorption liquid W produced by the ammonia detoxification device 60 can be supplied to the denitration ammonia solution tank 104 via the ammonia absorption liquid supply line 180. Therefore, ammonia absorption liquid W can be used to produce a denitration ammonia solution in the denitration ammonia solution tank 104, and this denitration ammonia solution in the denitration ammonia solution tank 104 can be used as a reducing agent for the denitration device 103. This allows for effective use of the ammonia absorption liquid W. As a result, the recovery tank 65 can be made smaller.

The float 1 of the fourth embodiment further includes an ammonia tank 10 in which liquefied ammonia is stored, and a liquefied ammonia supply line 106 that supplies the liquefied ammonia in the ammonia tank 10 to the denitrification ammonia solution tank 104.
Therefore, by mixing liquefied ammonia having a higher ammonia concentration than the ammonia absorption solution W supplied to the ammonia absorption solution tank 104 for denitration with liquefied ammonia having a higher ammonia concentration than the ammonia absorption solution W for denitration, it is possible to produce an ammonia absorption solution for denitration having a higher ammonia concentration than the ammonia absorption solution W.

Furthermore, in the fourth embodiment described above, the ammonia absorption liquid W obtained by absorbing the ammonia in the floating body 2 into the absorption liquid is used as part of the denitration ammonia solution for denitrifying the exhaust gas G from the combustion device 8. This makes it possible to effectively utilize the ammonia released into the atmosphere from the recovery tank 65 via the atmosphere release line 70 as a reducing agent for the denitration device 103. Therefore, the cost of producing the denitration ammonia solution can be reduced compared to when ammonia is separately prepared for producing the denitration ammonia solution.

In addition, in the fourth embodiment, the ammonia solubility of the ammonia absorption solution W stored in the recovery tank 65 can be adjusted within the recovery tank 65, so that ammonia absorption solution W with the desired ammonia solubility can be supplied to the denitration ammonia solution tank 104 to produce a denitration ammonia solution. This prevents the process of producing the denitration ammonia solution from becoming too complicated. Furthermore, because the ammonia absorption solution W can be used to dilute the fuel ammonia, it is possible to reduce the amount of fresh water used in the fresh water tank provided on the floating body 2 and the amount of water produced by the fresh water generator when producing the denitration ammonia solution. This makes it possible to reduce the volume of the fresh water tank and the capacity of the fresh water generator, thereby preventing the floating body 2 from becoming too large.

(Modification of the fourth embodiment)
In the above embodiment, a case has been described in which liquefied ammonia stored as fuel in the ammonia tank 10 is supplied to the denitration ammonia solution tank 104. However, liquefied ammonia may be supplied to the denitration ammonia solution tank 104 from an ammonia tank provided separately from the ammonia tank 10 for fuel.

In the above fourth embodiment, the combustion device 8 is described as a main device that uses ammonia as fuel. However, the combustion device 8 may be any device that burns fuel and discharges exhaust gas G. For example, the combustion device 8 may be a combustion device that burns a fuel other than ammonia and discharges exhaust gas G, or a combustion device that can switch between ammonia and a fuel other than ammonia. When the combustion device burns a fuel other than ammonia and discharges exhaust gas G, a separate ammonia tank may be provided to store liquefied ammonia, which is not a fuel, and liquefied ammonia may be supplied from this separate ammonia tank to the denitration ammonia solution tank 104.

Fifth Embodiment
Next, a floating body 1 according to a fifth embodiment of the present disclosure will be described with reference to the drawings. This fifth embodiment differs from the above-described embodiments and modifications in that it includes a dilution tank. Therefore, in this fifth embodiment, FIG. 1 is used, and the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. Note that the dilution tank of this fifth embodiment is also applicable to the modifications of the first embodiment and the second to fourth embodiments.
(Configuration of the floating body)
As shown in FIG. 1 , the float 1 of this embodiment includes a float body 2, an upper structure 4, a combustion device 8, an ammonia tank 10, a piping system (fuel line) 20, a compartment 30, and an ammonia detoxification device 360.

(Configuration of ammonia detoxification device)
FIG. 9 is a diagram showing a schematic configuration of a piping system for performing fuel purging and an ammonia removal device according to the fifth embodiment of the present disclosure.
9, the ammonia detoxification device 360 includes a dilution tank 300, an introduction line 301, a dilution air introduction section 305, a bypass line 309, an ammonia introduction section 361, an absorbing solution introduction section 62, a reactor 63, an ammonia absorbing solution discharge line 64, a recovery tank 65, a gas-phase ammonia concentration adjusting section 66, an atmosphere release line 70, an exhaust gas dilution section 73, and an ammonia absorbing solution supply line 80. The recovery tank 65, the gas-phase ammonia concentration adjusting section 66, the atmosphere release line 70, the exhaust gas dilution section 73, and the ammonia absorbing solution supply line 80 are the same as those in the first embodiment, and therefore detailed description thereof will be omitted.

The dilution tank 300 is provided on the floating body 2 and stores an absorption liquid capable of absorbing ammonia. In this embodiment, the dilution tank 300 is a ballast tank provided on the floating body 2. Water (e.g., seawater or freshwater) surrounding the floating body 2 can be introduced into the dilution tank 300 using a pump (not shown) and stored as absorption liquid. In other words, the dilution tank 300 contains an absorption liquid (liquid phase) and a gas phase. The pressure of the gas phase in the dilution tank 300 can be atmospheric pressure or a pressure higher than atmospheric pressure. Note that the dilution tank 300 is not limited to a ballast tank and may be, for example, a seawater tank or freshwater tank provided separately from the ballast tank.

A mixed gas of ammonia gas and an inert gas is introduced into the liquid phase of the dilution tank 300 from the residual ammonia supply line 25 described above. The introduction line 301 introduces the ammonia gas into the dilution tank 300. The introduction line 301 is equipped with an aeration pipe 302 that releases the mixed gas containing ammonia gas into the liquid phase of the dilution tank 300 as small bubbles.

In this embodiment, the introduction line 301 is connected to the ammonia temporary storage section 27 described above, and introduces gaseous ammonia separated into gas and liquid or vaporized in the ammonia temporary storage section 27 into the liquid phase as ammonia within the floating body main body 2. The aeration pipe 302 in this embodiment extends along the bottom surface of the dilution tank 300 and is formed so that bubbles released from the aeration pipe 302 spread throughout the liquid phase absorption liquid. In this embodiment, the gas released from the aeration pipe 302 is released into the absorption liquid using the pressure of the inert gas from the inert gas supply device 50. However, this is not limited to a configuration in which the gas is released into the absorption liquid using the pressure of the inert gas; for example, a blower or the like may be provided at the outlet of the ammonia temporary storage section 27.

The dilution air introduction section 305 adjusts the concentration of ammonia gas in the gas phase of the dilution tank 300. Here, the gas phase and the absorption liquid (liquid phase) of the dilution tank 300 attempt to reach a gas-liquid equilibrium state. In other words, as the ammonia concentration in the ammonia absorption liquid W, which is the absorption liquid that has absorbed ammonia, increases, the ammonia concentration in the gas phase also gradually increases. On the other hand, when the ammonia concentration in the gas phase decreases, the ammonia in the liquid phase is dissipated due to the partial pressure difference and gradually supplied to the gas phase, thereby decreasing the ammonia solubility in the ammonia absorption liquid W. In other words, the dilution air introduction section 305 can also be called a solubility adjustment section.

The dilution air introduction section 305 has a configuration similar to the gas-phase ammonia concentration adjustment section 66 of the first embodiment described above, and includes a first dilution gas supply line 306, a first blower 307, and a first valve 308. The first dilution gas supply line 306 is a pipe capable of introducing air or an inert gas into the gas phase of the dilution tank 300. In this embodiment, the first dilution gas supply line 306 is capable of introducing air into the gas phase of the dilution tank 300. The upper end of the first dilution gas supply line 306 opens, for example, above the upper deck 7, and the lower end of the first dilution gas supply line 306 is connected to the upper wall of the dilution tank 300. Note that if the first dilution gas supply line 306 introduces an inert gas, the inert gas may be supplied from an inert gas supply device 50.

The bypass line 309 branches off from the inlet line 301 and merges with the ammonia inlet section 361. In other words, the bypass line 309 bypasses the ammonia supplied through the inlet line 301 to the ammonia inlet section 361 without passing through the dilution tank 300. The bypass line 309 is equipped with a bypass valve 310. Meanwhile, the inlet line 301 is equipped with a valve 311, and the ammonia inlet section 361 is equipped with a valve 312. These bypass valves 310, 311, and 312 enable switching between the flow from the inlet line 301 to the dilution tank 300 and the flow from the inlet line 301 to the bypass line 309. Here, as the ammonia solubility in the liquid phase of the dilution tank 300 increases and the fuel purge approaches the end, a gas with a low ammonia concentration (purge gas) is introduced into the liquid phase of the dilution tank 300. When gas with a low ammonia concentration is introduced into a liquid phase with a high ammonia solubility, the ammonia quickly dissipates from the liquid phase to the gas phase. Therefore, in this fifth embodiment, the bypass line 309 bypasses the dilution tank 300, thereby preventing a decrease in the ammonia solubility in the liquid phase of the dilution tank 300. The bypass line 309 may be omitted.

The ammonia introduction section 361 is configured to be able to introduce the gas phase of the dilution tank 300 into the reactor 63. In other words, the ammonia introduction section 361 is configured to be able to communicate the gas phase of the dilution tank 300 with the internal space of the reactor 63. The gas phase of the dilution tank 300 is pushed into the ammonia introduction section 361 by air blown by the first blower 307 of the dilution air introduction section 305. This allows the gas phase of the dilution tank 300 to be introduced into the reactor 63.

As described above, the ammonia concentration in the gas phase of the dilution tank 300 changes. In some cases, the ammonia concentration in the gas phase is high enough to be released into the atmosphere. Therefore, for example, a release line (not shown) that branches off from the ammonia introduction section 361 and can be released into the atmosphere may be provided, allowing the gas in the gas phase of the dilution tank 300 to be switched between being supplied to the reactor 63 and being released into the atmosphere.

(Action and effect)
According to the fifth embodiment, when the ammonia concentration of the gas flowing from the dilution tank 300 into the ammonia introducing part 361 is high, the reactor 63 can absorb the ammonia into the absorbing liquid.
Therefore, it is possible to prevent ammonia gas dissipated from the ammonia absorbing solution W in the dilution tank 300 from being released into the atmosphere at a high concentration.

(First Modification of Fifth Embodiment)
In the fifth embodiment, a configuration has been described in which the gas in the gas phase of the dilution tank 300 can be introduced into the reactor 63. However, the present invention is not limited to this configuration. For example, as shown in Fig. 10, the arrangement of the dilution tank 300, the reactor 63, and the recovery tanks 65, 165 may be interchanged so that the gas in the gas phase of the recovery tanks 65, 165 can be introduced into the liquid phase of the dilution tank 300. In this case, the dilution tank 300 may be provided with a configuration similar to the atmosphere release line 70, i.e., a release line 370 that can release the gas in the gas phase of the dilution tank 300 into the atmosphere.

(Second Modification of Fifth Embodiment)
In the fifth embodiment, a case has been described in which ammonia from the residual ammonia supply line 25 is supplied to the dilution tank 300, but the present invention is not limited to this configuration. For example, the ammonia supplied to the dilution tank 300 may be ammonia contained in the gas discharged from the inert gas discharge line 77 of the reactor 63 or ammonia contained in the gas phase of the recovery tank 65, 165. Alternatively, the ammonia may have leaked from the compartment 30 as in the third embodiment.

Other Embodiments
The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

For example, in each of the above embodiments and modifications, the floating body 1 is described as a ship capable of navigating using a main engine or the like, but is not limited to a ship as long as the floating body is capable of storing ammonia.
In the above-described embodiments and modified examples, the case has been described in which the ammonia absorbed in the absorbing liquid by the reactor 63 is ammonia purged from the flow path R of the combustion device 8 and ammonia leaked within the compartment 30. However, the ammonia absorbed in the absorbing liquid by the reactor 63 is not limited to ammonia purged from the flow path R and ammonia leaked within the compartment 30, and may be unnecessary ammonia generated within the floating body 1, etc.

Furthermore, in the first to fourth embodiments and each modified example, the atmosphere vent line 70, 170 has been described as being open to the atmosphere. However, before the gas is released into the atmosphere from the atmosphere vent line 70, 170, the ammonia contained in the gas flowing through the atmosphere vent line 70 may be removed using an ammonia removal device such as a scrubber. This makes it possible to further reduce the ammonia concentration in the gas released into the atmosphere. Here, because the amount of ammonia contained in the gas flowing through the atmosphere vent line 70 is small, it is sufficient to use a small-capacity ammonia removal device such as a small scrubber, which prevents a reduction in the flexibility of installing the ammonia detoxification device 60, 160, 260 within the floating body main body 2.

In the first embodiment, ammonia discharged by purging is supplied to the ammonia introduction section 61, and in the third embodiment, ammonia leaked into the compartment 30 is supplied to the ammonia introduction section 261. However, for example, both ammonia introduction sections 61 and 261 may be provided, and the ammonia introduction section 61 and the ammonia introduction section 261 may be switched between for use as needed.

In the fourth variant of the first embodiment, the gas phase pressure in the recovery tank 165 is increased above atmospheric pressure. However, it is also possible to increase only the pressure within the reactor 163 and leave the gas phase pressure in the recovery tank 165 at, for example, atmospheric pressure.

In the third embodiment, the exhaust damper 35, intake air damper 33, intake fan inlet damper 39, and intake damper 41 are manually opened and closed by an operator. However, the configuration is not limited to manual operation by an operator. For example, the opening and closing operations of the exhaust damper 35, intake air damper 33, intake fan inlet damper 39, and intake damper 41 may be automatically controlled by a control device based on the ammonia concentration within the section 30, the results of ammonia leak detection, etc.

<Additional Notes>
The floating body 1 described in the embodiment can be understood, for example, as follows.

(1) According to a first aspect, a float 1 includes a float body 2 floating on water, an ammonia introduction section 61, 261 into which ammonia in the float body 2 can be introduced, an absorbing liquid introduction section 62 into which an absorbing liquid capable of absorbing the ammonia can be introduced, a reactor 63, 163 that produces an ammonia absorbing liquid W by reacting the ammonia from the ammonia introduction section 61, 261 with the absorbing liquid from the absorbing liquid introduction section 62, a recovery tank 65, 165 into which the ammonia absorbing liquid W produced in the reactor 63, 163 and discharged from the reactor 63, 163 is introduced and in which the ammonia absorbing liquid W can be stored, and an air release line 70, 170 that can release a gas phase in the recovery tank 65, 165 to the atmosphere.
Examples of the absorption liquid include seawater and fresh water. An example of the recovery tank 65, 165 is a ballast tank.

This allows the reactors 63, 163 to absorb the ammonia in the floating body 2 into the absorbing liquid. Then, the ammonia absorbing liquid W having absorbed ammonia is stored in the recovery tank 65, 165, and the ammonia is gradually released from the ammonia absorbing liquid W in the recovery tank 65, 165 into the gas phase, making it possible to release the gas with a low ammonia concentration into the atmosphere through the atmosphere release line 70, 170. Furthermore, the reactors 63, 163 can increase the ammonia solubility in the ammonia absorbing liquid W without being affected by, for example, the gas-liquid partial pressure difference in the recovery tank 65, 165, and therefore, it is possible to prevent the recovery tank 65, 165 that stores the ammonia absorbing liquid W from becoming large in size.
In addition, by utilizing the partial pressure difference between the liquid phase and the gas phase, most of the ammonia absorbed in the ammonia absorbent W can be stripped into the gas phase to substantially detoxify the ammonia absorbent W, which eliminates the need to remove ammonia in the ammonia absorbent W using an acid such as dilute sulfuric acid.
Furthermore, a pilot flame for burning and detoxifying ammonia is no longer necessary.
Therefore, the ammonia absorbing solution W can be detoxified while suppressing an increase in the burden on workers and fuel consumption.

(2) The float 1 according to the second aspect is the float 1 of (1), and is provided with a gas phase ammonia concentration adjusting unit 66, 166 that adjusts the ammonia concentration in the gas phase of the recovery tank 65, 165.
This makes it possible to adjust the amount of ammonia released from the ammonia absorbing solution W stored in the recovery tank 65, 165 to the gas phase of the recovery tank 65, 165. Therefore, it becomes possible to adjust the ammonia solubility in the ammonia absorbing solution W stored in the recovery tank 65, 165.

(3) The float 1 according to the third aspect is the float 1 of (1) or (2), and is provided with an exhaust gas dilution section 73 that can dilute the gas phase gas released into the atmosphere through the atmospheric release line 70, 170 with a dilution gas.
This makes it possible to prevent gas with a high ammonia concentration from being released into the atmosphere from the atmosphere release lines 70, 170.

(4) The float 1 according to the fourth aspect is any one of the floats 1 according to (1) to (3), and is provided with a first pressure adjusting unit capable of adjusting the pressure of the reactor 63, 163.
This makes it possible to increase the pressure inside the reactors 63 and 163. Therefore, it is possible to further increase the solubility of ammonia in the absorbing liquid in the reactors 63 and 163. Therefore, it is possible to reduce the amount of the absorbing liquid required to absorb ammonia.
An example of the first pressure adjusting unit is a combination of a first pressure sensor 90 and an inert gas exhaust valve 91 .

(5) The float 1 according to the fifth aspect is any one of the floats 1 of (1) to (4) and is provided with a second pressure adjustment unit capable of adjusting the pressure of the gas phase in the recovery tank 65, 165.
This makes it possible to increase the pressure inside the recovery tanks 65, 165. Therefore, the ammonia solubility in the ammonia absorbing solution W stored in the recovery tanks 65, 165 can be further increased, and more ammonia can be retained in the recovery tanks 65, 165.
An example of the second pressure adjusting unit is a combination of the atmospheric release valve 72 and the first compressor 168 .

(6) The float 1 according to the sixth aspect is any one of the floats 1 of (1) to (5), and is provided with a temperature adjustment unit 82 capable of adjusting the temperature of the ammonia absorption solution W stored in the recovery tank 65, 165.
This makes it possible to adjust the rate at which ammonia is released from the ammonia absorbing solution W into the gas phase of the recovery tanks 65 and 165 .

(7) The float 1 according to a seventh aspect is any one of the floats 1 according to (1) to (6), and includes a recirculation line 93 that returns the ammonia absorbing solution W produced by the reactor 63, 163 to the absorbing solution introduction part 62, and a switching part that switches the supply destination of the ammonia absorbing solution W produced by the reactor 63, 163 between the absorbing solution introduction part 62 and the recovery tank 65, 165.
As a result, the ammonia absorbing solution W that has absorbed ammonia can be introduced again into the reactor 63, 163 through the recirculation line 93, and the ammonia solubility of the ammonia absorbing solution W can be sufficiently increased. Then, the ammonia absorbing solution W with a sufficiently increased ammonia solubility can be stored in the recovery tank 65, 165. Therefore, when the amount of ammonia introduced from the ammonia introducing part 61, 261 is constant, ammonia can be absorbed with a smaller amount of absorption solution, and the recovery tank 65, 165 can be made smaller. Furthermore, when the size of the recovery tank 65, 165 is constant, more ammonia can be stored in the recovery tank 65, 165.
An example of a switching section is the combination of a first recirculation valve 95 and a discharge valve 99 .

(8) The float 1 according to the eighth aspect is the float 1 of (7), and includes state quantity detection units 100, 101 that detect the state quantity of the ammonia absorption solution W produced by the reactors 63, 163, and a switching control unit that performs switching control of the switching unit based on the detection results of the state quantity detection units 100, 101.
This makes it possible to detect whether the ammonia solubility has increased sufficiently based on the state quantity of the ammonia absorption solution W, and therefore makes it possible to automatically store the ammonia absorption solution W in the recovery tank 65, 165 at the timing when the ammonia solubility has increased sufficiently.

(9) The float 1 according to the ninth aspect is any one of the floats 1 of (1) to (8), and is provided with an ammonia absorbing liquid supply line 80, 180 that supplies the ammonia absorbing liquid W stored in the recovery tank 65, 165 to the outside of the recovery tank 65, 165.
This allows the ammonia absorbing solution W stored in the recovery tank 65, 165 to be supplied to the outside of the recovery tank 65, 165, so that, for example, when the float is at port, the ammonia absorbing solution W can be unloaded and quickly subjected to detoxification treatment. In addition, since the ammonia absorbing solution W can be supplied to equipment that uses ammonia within the float 1, the ammonia absorbing solution W can be effectively utilized.

(10) A float 1 according to a tenth aspect is any one of the floats 1 of (1) to (9), and includes a combustion device 8 that uses ammonia as fuel, an ammonia tank 10 that stores the ammonia as fuel, a fuel line 20 that supplies the ammonia from the ammonia tank 10 to the combustion device 8, an inert gas supply device 50 that supplies an inert gas into the fuel line 20, and a residual ammonia supply line 25 that discharges the ammonia in the fuel line 20 that has been pressed by the inert gas, and the ammonia introduction part 61, 261 introduces the ammonia discharged by the residual ammonia supply line 25 into the reactor 63, 163.
This allows the ammonia discharged from the residual ammonia supply line 25 to be absorbed into the absorption liquid in a short time, while the ammonia absorbed in the ammonia absorption liquid W can be gradually released into the gas phase in the recovery tanks 65, 165. Therefore, it becomes unnecessary to detoxify the ammonia purged from the combustion device 8, the ammonia tank 10, the fuel line 20, etc. in a short time.

(11) The float 1 according to the eleventh aspect is any one of the floats 1 according to (1) to (9), and includes a dilution tank 300 in which the absorption liquid is stored, and an introduction line 301 for introducing the ammonia into the dilution tank 300, and the ammonia introduction part 61, 261 introduces the gas in the gas phase in the dilution tank into the reactor 63, 163.
This allows the ammonia to be absorbed by the absorbing liquid in the dilution tank 300. Furthermore, the ammonia released into the gas phase of the dilution tank 300 can be absorbed by the absorbing liquid in the reactor 63.

(12) The float 1 according to the twelfth aspect is any one of the floats 1 of (1) to (9), and includes a dilution tank 300 in which the absorption liquid is stored, and an introduction line 301 for introducing the ammonia into the dilution tank 300, and the introduction line 301 introduces the gas in the gas phase in the recovery tank 65, 165 into the liquid phase of the dilution tank 300.
This allows the absorption liquid in the dilution tank 300 to absorb the ammonia contained in the gas phase of the recovery tanks 65 and 165 .

(13) The float 1 according to the thirteenth aspect is any one of the floats 1 of (1) to (9), and includes a combustion device 8 that discharges exhaust gas by burning fuel, a denitration device 103 that performs denitration treatment on the exhaust gas discharged from the combustion device 8, a denitration ammonia solution tank 104 that stores a denitration ammonia solution used as a reducing agent in the denitration device 103, and an ammonia absorption liquid supply line 180 that supplies the ammonia absorption liquid W stored in the recovery tank 65, 165 to the denitration ammonia solution tank 104.
As a result, the ammonia absorbent solution W recovered in the recovery tank 65, 165 can be supplied to the denitration ammonia solution tank 104 through the ammonia absorbent solution supply line 180. Therefore, a denitration ammonia solution can be produced in the denitration ammonia solution tank 104 using the ammonia absorbent solution W, and the denitration ammonia solution in the denitration ammonia solution tank 104 can be used as a reducing agent for the denitration device 103. As a result, the ammonia absorbent solution W stored in the recovery tank 65, 165 can be effectively utilized.

(14) A float 1 according to a fourteenth aspect is the float 1 described in (13), and includes an ammonia tank 10 for storing liquefied ammonia, and a liquefied ammonia supply line 106 for supplying the liquefied ammonia stored in the ammonia tank 10 to the denitrification ammonia solution tank 104.
As a result, the ammonia absorbent W supplied to the denitration ammonia solution tank 104 can be mixed with ammonia stored in the ammonia tank 10, which has a higher ammonia concentration than the ammonia absorbent W, to produce a denitration ammonia solution having a higher ammonia concentration than the ammonia absorbent W.

(15) The float 1 according to the fifteenth aspect is any one of the floats 1 of (1) to (9), wherein the float body 2 has a compartment 30 in which ammonia-related equipment is housed and into which outside air can be introduced, and the ammonia introduction section 61, 261 introduces the gas in the compartment 30 into the reactor 63, 163.
As a result, the ammonia leaked within the compartment 30 of the floating body main body 2 is absorbed into the absorbing liquid, and the ammonia leaked within the compartment 30 can be removed by being absorbed into the absorbing liquid in the reactors 63, 163. Furthermore, the ammonia absorbed in the absorbing liquid in the recovery tanks 65, 165 can be released into the gas phase and released to the atmosphere, thereby making it possible to detoxify the ammonia absorbing liquid W.

1...Floating body 2...Floating body main body 4...Superstructure 5A, 5B...Side 6...Bottom of the vessel 7...Upper deck 8...Combustion device 10...Ammonia tank 20...Piping system 21...Supply pipe 22...Return pipe 23, 24...Shut-off valve 25...Residual ammonia supply line 26...Residual ammonia supply line main body 27...Temporary ammonia storage section 28...Shut-off valve 30...Compartment 31...Air supply equipment 32...Exhaust equipment 33...Air supply damper 34...Air supply duct 35...Exhaust damper 36...Exhaust duct 37...Line main body 38...Inlet fan 39...Inlet fan inlet damper 40...Ammonia buffer tank 41...Inlet damper 50...Inert gas supply device 51...Inert gas supply section 52...Inert gas supply pipe 53...Inert gas supply valve 60, 160, 260, 360...Ammonia detoxification device 61, 261, 361...Ammonia introduction section 62...Absorbing liquid introduction section 63, 163...Reactor 63t...Reaction promotion section 64, 164...Ammonia absorbing liquid discharge line 65, 165...Recovery tank 66, 166...Gas phase ammonia concentration adjustment section 67, 167...First dilution gas supply line 68...First blower 69...First valve 70, 170, 370...Atmospheric release line 71...Open line main body 72...Atmospheric release valve 73...Discharge gas dilution section 74, 174...Second dilution gas supply line 75...Second blower 76...Second valve 77...Inert gas discharge line 80, 180...Ammonia absorbing liquid supply line 81...Third blower 82...Absorbing liquid temperature adjustment section 83...Absorbing liquid pH adjustment device 84...Acid gas introduction device 86...Line body 87...Inlet blower 88...Inlet valve 90...First pressure sensor 91...Inert gas exhaust valve 92...Absorbent solution intake valve 93...Recirculation line 94...Recirculation line body 95...First recirculation valve 96...Second recirculation valve 97...Recirculation pump 98...Discharge line body 99...Discharge valve 100...pH detection unit 101...Liquid level detection unit 102...Exhaust pipe 103...Denitration device 104...Denitration ammonia solution tank 105...Denitration ammonia solution supply line 106...Liquefied ammonia supply line 106A...First line 106B...Second line 107...Circulation piping 108...Agitation pump 109...Concentration meter 110...Denitration ammonia solution pump 111...Ammonia absorbent solution supply pump 112...Flow rate adjustment valve 113...Feed pump 168...First compressor 300...Dilution tank 301...Inlet line 302...Aeration pipe 305...Dilution air inlet 306...First dilution gas supply line 307...First blower 308...First valve 309...Bypass line 310...Bypass valve 311, 312...Valves R...Flow path

Claims (15)

A floating body that floats on the water,
an ammonia introduction section capable of introducing ammonia into the floating body;
an absorbing liquid introduction section capable of introducing an absorbing liquid capable of absorbing the ammonia;
a reactor in which the ammonia from the ammonia introducing section and the absorbing liquid from the absorbing liquid introducing section are reacted to produce an ammonia absorbing liquid;
a recovery tank into which the ammonia absorbing liquid produced in the reactor and discharged from the reactor is introduced and which is capable of storing the ammonia absorbing liquid;
an atmosphere release line capable of releasing the gas phase in the recovery tank to the atmosphere;
A floating body comprising: The float according to claim 1, further comprising a gas phase ammonia concentration adjusting unit for adjusting the ammonia concentration in the gas phase of the recovery tank. 3. The floating body according to claim 1, further comprising a discharge gas dilution section capable of diluting the gas phase gas discharged into the atmosphere through the atmosphere release line with a dilution gas. The floating body according to claim 1 , further comprising a first pressure adjusting unit capable of adjusting the pressure of the reactor. The floating body according to claim 1 , further comprising a second pressure adjusting unit capable of adjusting the pressure of the gas phase in the recovery tank. The floating body according to claim 1 , further comprising a temperature adjusting unit capable of adjusting the temperature of the ammonia absorbing solution stored in the recovery tank. a recirculation line for returning the ammonia absorption liquid produced in the reactor to the absorption liquid introduction section;
a switching unit that switches a supply destination of the ammonia absorbing solution produced in the reactor between the absorbing solution introducing unit and the recovery tank;
7. The floating body according to claim 1, comprising: a state quantity detection unit that detects a state quantity of the ammonia absorbing solution produced by the reactor;
a switching control unit that controls switching of the switching unit based on a detection result of the state quantity detection unit;
The floating body according to claim 7, comprising: The floating body according to any one of claims 1 to 8, further comprising an ammonia absorbing liquid supply line that supplies the ammonia absorbing liquid stored in the recovery tank to the outside of the recovery tank. a combustion device that uses the ammonia as fuel;
an ammonia tank that stores the ammonia as fuel;
a fuel line that supplies the ammonia from the ammonia tank to the combustion device;
an inert gas supply device for supplying an inert gas into the fuel line;
a residual ammonia supply line that discharges the ammonia in the fuel line that is pressed by the inert gas;
Equipped with
The ammonia introduction part
The floating body according to any one of claims 1 to 9, wherein the ammonia discharged through the residual ammonia supply line is introduced into the reactor. a dilution tank in which the absorption liquid is stored;
an introduction line for introducing the ammonia into the dilution tank;
The floating body according to claim 1 , wherein the ammonia introducing section introduces gas in a gas phase in the dilution tank into the reactor. a dilution tank in which the absorption liquid is stored;
an introduction line for introducing the ammonia into the dilution tank;
The floating body according to claim 1 , wherein the introduction line introduces gas in a gas phase in the recovery tank into a liquid phase in the dilution tank. a combustion device that burns fuel to emit exhaust gas;
a denitration device that performs denitration treatment on the exhaust gas discharged from the combustion device;
a denitration ammonia solution tank for storing a denitration ammonia solution used as a reducing agent in the denitration device;
an ammonia absorbing solution supply line that supplies the ammonia absorbing solution stored in the recovery tank to the denitrification ammonia solution tank;
10. The floating body according to claim 1, comprising: an ammonia tank for storing liquefied ammonia;
The floating body according to claim 13, further comprising a liquefied ammonia supply line that supplies the liquefied ammonia stored in the ammonia tank to the denitrification ammonia solution tank. the floating body includes a compartment in which ammonia-related equipment is accommodated and into which outside air can be introduced,
The floating body according to claim 1 , wherein the ammonia introducing section introduces gas in the compartment into the reactor.