JP7304828B2 - Switching device and its operation method, and coke oven gas refining equipment - Google Patents

Description

The present disclosure relates to a switching device and its operating method.

Since coke oven gas has a high calorie, it is utilized for various purposes such as fuel. Coke oven gas discharged from the coke oven has a high temperature and contains corrosive substances such as hydrogen sulfide and ammonia. For this reason, the coke oven gas is cooled by a gas cooler in a refining facility provided in, for example, a steel plant (see Patent Document 1), and further treated by a desulfurization device, a deammonification device, etc., and is treated with corrosive substances such as hydrogen sulfide and ammonia. Substance is removed. After that, it is used as a fuel or raw material in each facility of the steelworks.

Coke oven gas contains not only corrosive substances such as moisture, hydrogen sulfide and ammonia, but also clogging and abrasive solids such as sludge. For this reason, it is necessary to regularly perform maintenance such as replacement and repair of ducts and the like through which coke oven gas flows. In maintenance, it is required to ensure safety by surely shutting off the coke oven gas. For shutting off the coke oven gas, for example, a sealed gate valve described in Patent Document 2 is used.

JP-A-6-73386 JP 2017-166621 A

When performing maintenance on coke oven gas ducts, etc., gate valves are used to shut off the flow of coke oven gas, but there is concern that a general gate valve alone is not sufficient to shut off coke oven gas. . In such a case, in addition to the gate valve, a water seal duct is provided in the flow path of the coke oven gas, or a sealed gate valve as described in Patent Document 2 is provided. Can double block traffic. As a result, it is possible to suppress the outflow of the coke oven gas to the downstream side.

On the other hand, installation of the water sealing duct requires space in the coke oven gas refining equipment. For this reason, installation is difficult when space is limited. In addition, the sealing type gate valve requires less installation space than the water-sealed duct, but the sealing function is lost when solid matter such as sludge contained in the coke oven gas gets caught between the valve body and the valve body. Reliability is not sufficient as there are cases where collateral cannot be secured. Therefore, it is considered effective to reduce the installation space if a device that is normally installed in the flow path of coke oven gas can be provided with a highly reliable function of shutting off coke oven gas.

Therefore, the present disclosure provides a switching device capable of reducing the installation space by combining the function of separating droplets contained in the coke oven gas and the function of blocking the coke oven gas, and an operation method thereof. The present disclosure also provides a coke oven gas refining facility that includes such a switching device.

In one aspect, the present disclosure has a switching function between a separation mode for separating droplets from coke oven gas and a blocking mode for blocking the flow of coke oven gas, and in the separation mode, the coke oven gas flow path to provide a switching device comprising a main body that contains liquid in a shut-off mode and shuts off flow of coke oven gas by means of a liquid seal.

Since the switching device is configured to be capable of switching between the separation mode and the blocking mode, the installation space can be reduced compared to the case where devices having these functions are separately provided. In the shut-off mode, the liquid seal shuts off the flow of coke oven gas. Therefore, coke oven gas can be shut off with a simple structure and high reliability.

The switching device includes a gas introduction section for introducing coke oven gas into the main body, and a gas lead-out section for leading out from the main body coke oven gas in which the droplets are smaller than that of the coke oven gas introduced from the gas introduction section. Further, the main body may include a liquid supply section that supplies liquid and a liquid discharge section that discharges liquid from the main body. As a result, switching operation between the blocking mode and the separation mode can be performed smoothly.

The switching device may be provided downstream of at least one device selected from the group consisting of a cooling device for cooling coke oven gas and a gas-liquid contact device for contacting coke oven gas with an aqueous solution. Coke oven gas that has passed through at least one device selected from the group consisting of a cooling device and a gas-liquid contacting device tends to contain many droplets such as moisture. Therefore, the droplets can be sufficiently separated in the separation mode for separating the droplets from the coke oven gas.

The switching device may comprise a riser pipe for adjusting the level of the liquid in the body in shut-off mode. This makes it possible to easily adjust the height of the liquid.

The main body of the switching device may function as a mist separator in the separation mode. This makes it possible to easily separate the droplets contained in the coke oven gas.

The main body is composed of a plurality of parts including a first main body and a second main body, and each of the first main body and the second main body is configured to be independently switchable between a separation mode and a cutoff mode. good. As a result, facilities such as ducts on the downstream side of the switching device can be provided in a plurality of systems. For example, depending on the flow rate of the coke oven gas, both the first main body and the second main body may be placed in the separation mode, or only one of the first main body and the second main body may be placed in the separation mode. . If only one side is set to the separation mode, maintenance of facilities such as ducts can be performed while continuing the flow of coke oven gas.

While one of the first body portion and the second body portion is in the isolation mode, the other of the first body portion and the second body portion may be in the blocking mode. This allows the separation mode and the blocking mode to be performed in parallel. Therefore, the maintenance of the equipment downstream of the switching device can be performed while the coke oven gas continues to flow. For example, when it becomes necessary to perform maintenance on a duct connected to the first main body among multiple systems of ducts, the first main body may be set to the blocking mode and the second main body may be set to the separation mode. Thus, the coke oven gas can be continuously circulated through the second main body and the duct connected thereto. Therefore, it is possible to stabilize the production of coke and stabilize the operation of various devices using coke oven gas.

In one aspect, the present disclosure provides a method of operating any of the switching devices described above, comprising the steps of: performing an isolation mode in a first body portion and performing an isolation mode in a second body portion; A step of discharging the liquid and starting the introduction and withdrawal of coke oven gas in the second body, switching the second body from the shutoff mode to the separation mode, and stopping the introduction of the coke oven gas into the first body. supplying liquid to the first body portion to switch the first body portion from the isolation mode to the isolation mode.

In the above operation method, the operation modes of the first main body and the second main body are switched. As a result, for example, maintenance of the equipment downstream of the first main body and the second main body can be performed sequentially while the coke oven gas continues to flow. Therefore, it is possible to stabilize the production of coke and stabilize the operation of various devices using coke oven gas. Moreover, since the switching device described above is used, the coke oven gas can be shut off with a simple structure and high reliability.

In one aspect, the present disclosure provides coke oven gas refining equipment including any of the switching devices described above. Since such coke oven gas refining equipment includes the switching device, it is possible to stabilize coke production and stabilize the operation of various devices in the refining equipment. Also, the coke oven gas can be cut off with high reliability.

In the present disclosure, a switching device capable of reducing the installation space by combining the function of a mist separator and the function of shutting off coke oven gas while having reliability of shutting off coke oven gas, and an operation method thereof can be provided. Further, in the present disclosure, it is possible to provide a coke oven gas refining facility that includes such a switching device.

FIG. 1 is a diagram illustrating a separation mode of a switching device according to one embodiment. FIG. 2 is a diagram showing the cut-off mode of the switching device of FIG. FIG. 3 is a diagram illustrating a blocking mode of a switching device according to another embodiment; FIG. 4 is a diagram showing a switching device according to yet another embodiment. FIG. 5 is a diagram showing a state after the operation mode of the switching device of FIG. 4 is switched. FIG. 6 is a diagram showing a refining facility for coke oven gas according to one embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings as the case may be. However, the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following contents. In the description, the same reference numerals are used for the same elements or elements having the same function, and overlapping descriptions are omitted in some cases. In addition, unless otherwise specified, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratio of each element is not limited to the illustrated ratio.

1 and 2 are diagrams showing the switching device of this embodiment. The switching device 100 shown in FIGS. 1 and 2 has a switching function between a separation mode for separating droplets from the coke oven gas and a blocking mode for blocking the flow of the coke oven gas. The switching device 100 includes a main unit 10, a gas introduction unit 12 for introducing coke oven gas, and a coke oven gas having droplets reduced from the coke oven gas introduced from the gas introduction unit 12. a gas lead-out portion 14 for supplying liquid to the body portion 10; a liquid supply portion 16 for supplying liquid to the body portion 10; The gas introduction section 12 and the liquid supply section 16 are provided with openable and closable valves V2 and V6, respectively. The liquid discharge part 17 branches into a pipe 18 and a pipe 19 . A pipe 20 branches off from the pipe 18 . Pipes 18, 19 and 20 are provided with openable and closable valves V8, V9 and V10, respectively.

Coke oven gas (COG) is a gas obtained when coal is carbonized in a coke oven and contains hydrogen, carbon monoxide, hydrocarbons, water and the like. Gases discharged from coke ovens are hot and may contain corrosive substances such as hydrogen sulfide and ammonia. For this reason, the coke oven gas may be cooled by a cooling device provided in a refining facility for coke oven gas, and hydrogen sulfide, ammonia, and the like may be washed and removed by a desulfurization device, a deammonification device, and the like. Coke oven gas flowing out from a cooling device, a desulfurization device, a deammonification device, or the like contains a large amount of mist-like liquid droplets.

FIG. 1 shows switching device 100 in isolation mode. In each figure, filled valves are closed, and white valves are open. In the isolation mode, valves V6, V8 and V10 are closed and valves V2 and V9 are open. As a result, the coke oven gas containing droplets is introduced into the main body 10 from the gas introduction section 12 . In the separation mode, the main body 10 functions as a mist separator. At least part of the droplets contained in the coke oven gas are separated in the main body 10 . The coke oven gas whose droplets have been reduced in the main body 10 is discharged from the gas discharge part 14 . In this way, the main body 10 constitutes a coke oven gas flow path together with the gas inlet 12 and the gas outlet 14 .

The liquid droplets separated from the coke oven gas in the main body 10 are continuously extracted from the liquid discharge part 17 connected to the bottom of the main body 10, flow through the pipe 19, and are discharged. The separated liquid may be, for example, water, or a mixture of water and oils such as hydrocarbons, hydrogen sulfide, and ammonia.

In this embodiment, the liquid discharge part 17 branches into the pipe 18 and the pipe 19, and the pipe 20 branches from the pipe 18, but it is not limited to such an aspect. For example, the pipe 18, the pipe 19, and the pipe 20 may be individually connected to the bottom portion of the body portion 10, and each constitutes a liquid discharge portion. The separated liquid discharged from the pipe 19 may be returned to, for example, the cooling device, the desulfurization device, or the deammonification device, which is the source of the droplets, provided upstream of the switching device 100, or by other methods. may be processed.

FIG. 2 shows the switching device 100 in its blocking mode. In shutdown mode, valve V2 is closed. Further, the valve V6 is opened, and the liquid 40 supplied from the liquid supply portion 16 to the main body portion 10 is stored in the main body portion 10 . Liquid 40 is, for example, water. The liquid level of the liquid 40 is higher than the ejection port of the gas introduction part 12 , and the ejection port is located in the liquid 40 . Such a liquid seal with the liquid 40 blocks the flow of the coke oven gas. The liquid seal height 18b must be equal to or greater than the difference between the maximum operating pressure of the coke oven gas and the discharge destination pressure of the pipe 18a. For example, even if the valve V<b>2 is not completely closed due to foreign matter, the coke oven gas can be prevented from leaking into the gas lead-out portion 14 by sealing with the liquid 40 . Therefore, the switching device 100 can reliably shut off the flow of coke oven gas in the shut-off mode.

The liquid discharge section 17 has, on its downstream side, a rising pipe 18a for adjusting the liquid level of the liquid 40 in the main body section 10 . By keeping the valves V6 and V8 in an open state, the liquid level in the main body 10 can be adjusted to be constant by the rising pipe 18a. The liquid sealing height 18b must be equal to or greater than the difference between the maximum operating pressure of the coke oven gas and the discharge destination pressure of the pipe 18a. There is no restriction on the pressure of the coke oven gas, and it may be positive pressure or negative pressure.

In the switching device 100, the coke oven gas can be shut off reliably by the liquid seal. Therefore, for example, maintenance such as replacement and repair of the duct on the downstream side of the gas lead-out portion 14 can be performed with high reliability. In addition, it is possible to shut off coke oven gas by a simple operation of supplying liquid to the main body 10 to establish a liquid sealed state. Therefore, the switching device 100 can shut off the coke oven gas with a simple structure and high reliability.

The switching device 100 can easily switch between the separation mode shown in FIG. 1 and the cutoff mode shown in FIG. Switching from the separation mode to the cutoff mode can be performed, for example, by the following valve operations.
- Valve V2: Change from an open state to a closed state.
- Valve V9: changes from an open state to a closed state.
- Valve V6: Open from the closed state.
- Valve V8: Open from closed state.

Although the valve V6 is opened in the blocking mode, the valve V6 may be closed after the liquid is supplied from the liquid supply unit 16 and the liquid level in the main body 10 reaches a sufficient height. As a result, the amount of liquid used for liquid sealing can be reduced. Moreover, the above operation is an example, and may be changed as necessary.

Switching from the blocking mode to the separation mode can be performed, for example, by the following valve operations. The following operation is also an example, and may be changed as necessary.
- Valve V6: changes from an open state to a closed state.
Valve V10: Opened from closed state, drains the liquid 40 contained in the main body 10 from the pipe 20, and then closed.
- Valve V9: Open from the closed state.
- Valve V8: changes from an open state to a closed state.
- Valve V2: Open from closed state.

The liquid 40 in the main body 10 used for liquid sealing is discharged to the outside through the pipe 20 . The pipe 20 secures a liquid seal height 20a with respect to the pipe 18, which is equal to or greater than the difference between the maximum operating pressure of the coke oven gas and the discharge destination pressure of the pipe 20. Thereby, coke oven gas can be suppressed from flowing out to the downstream side of the pipe 20 . If there is no problem even if the liquid volume inside the device on the upstream side of the switching device 100 increases, the liquid 40 inside the main body 10 used for the liquid seal can be may be returned to the inside of the device on the upstream side. In this case, the pipe 20 may be omitted.

Since the switching device 100 has the functions of both the mist separator and the water sealing duct, the installation space can be reduced compared to the case where the mist separator and the water sealing duct are installed separately. In the present embodiment, an example in which the switching device 100 functions as a mist separator in the separation mode has been described, but the present invention is not limited to this. The main body of the switching device may have a structure capable of switching between separation of droplets from the coke oven gas and liquid sealing.

FIG. 3 is a diagram showing a switching device of another embodiment. The switching device 110 of FIG. 10, a liquid supply section 16 for supplying liquid to the body section 10a, and a liquid discharge section 17 for discharging liquid from the body section 10a. The gas introduction section 12 and the liquid supply section 16 are provided with openable and closable valves V2 and V6, respectively. The liquid discharge part 17 is branched into a pipe 18 and a pipe 19 , and a pipe 20 is branched from the pipe 18 . Pipes 18, 19 and 20 are provided with openable and closable valves V8, V9 and V10, respectively.

In the switching device 110, the positional relationship between the gas introduction portion 12 and the gas discharge portion 14 is opposite to that of the switching device 100 shown in FIGS. Switching device 110 has the function of a cyclone in separation mode. Droplets contained in the coke oven gas can be reduced by centrifugal force as in a normal cyclone. Other than these points, it may be the same as the switching device 100 .

FIG. 3 shows the blocking mode of the switching device 110 . The liquid level of the liquid 40 is higher than the outlet of the gas outlet 14 . As a result, the main body 10a is liquid-sealed and the flow of coke oven gas is cut off. The liquid level of the liquid 40 in the main body portion 10 a is adjusted by the height of the rising pipe 18 a downstream of the liquid discharge portion 17 . The liquid seal height 18b ensures a liquid seal height equal to or greater than the difference between the maximum operating pressure of the coke oven gas and the discharge destination pressure of the pipe 18a. Switching between the blocking mode and the separation mode of the switching device 110 can be performed in the same manner as the switching device 100 .

4 and 5 are diagrams showing a switching device of still another embodiment. The switching device 200 of FIGS. 4 and 5 includes a main body 10. As shown in FIG. The body portion 10 is composed of a first body portion 10A and a second body portion 10B. The first main body portion 10A and the second main body portion 10B may have the same shape or different shapes.

The first body portion 10A includes a gas introduction portion 12A that introduces coke oven gas into the first body portion 10A, and a coke oven gas having droplets less than the coke oven gas introduced from the gas introduction portion 12A. It includes a gas lead-out portion 14A led out from the first body portion 10A, a liquid supply portion 16A for supplying liquid to the first body portion 10A, and a liquid discharge portion 17A for discharging the liquid from the first body portion 10A. The gas introduction section 12A and the liquid supply section 16A are provided with openable and closable valves V12 and V16, respectively. The liquid discharge part 17A branches into a pipe 18A and a pipe 19A, and the pipe 20A branches from the pipe 18A. The pipe 18A, the pipe 19A, and the pipe 20A are provided with openable/closable valves V18, V19, and V30, respectively.

The second body portion 10B includes a gas introduction portion 12B that introduces the coke oven gas into the second body portion 10B, and a coke oven gas introduced from the gas introduction portion 12B in which droplets are reduced more than the coke oven gas. It includes a gas lead-out portion 14B leading out from the second main body portion 10B, a liquid supply portion 16B that supplies liquid to the second main body portion 10B, and a liquid discharge portion 17B that discharges liquid from the second main body portion 10B. The gas introduction section 12B and the liquid supply section 16B are provided with openable and closable valves V22 and V26, respectively. The liquid discharge portion 17B branches into a pipe 18B and a pipe 19B, and a pipe 20B branches from the pipe 18B. The pipe 18B, the pipe 19B, and the pipe 20B are provided with openable/closable valves V28, V29, and V32, respectively.

FIG. 4 shows a state in which the first body portion 10A is in the separation mode and the second body portion 10B is in the blocking mode. The droplets separated from the coke oven gas in the first body portion 10A are continuously drawn out from the liquid discharge portion 17A connected to the bottom portion of the first body portion 10A, flowed through the pipe 19A and discharged.

On the other hand, the valve V22 is closed in the second body portion 10B. Also, the valve V26 is open, and the liquid 40 supplied from the liquid supply portion 16B to the second body portion 10B is stored in the second body portion 10B. The liquid level of the liquid 40 is higher than the discharge port of the gas introduction portion 12B, and the discharge port is positioned in the liquid 40. As shown in FIG. Such a liquid seal with the liquid 40 blocks the flow of the coke oven gas. The liquid level of the liquid 40 in the second body portion 10B is adjusted by the height of the rising pipe 18a located downstream of the liquid discharge portion 17B. The liquid seal height 18b ensures a liquid seal height equal to or greater than the difference between the maximum operating pressure of the coke oven gas and the discharge destination pressure of the pipe 18a.

For example, even if the valve V22 is not completely closed due to foreign matter, the coke oven gas can be prevented from leaking into the gas lead-out portion 14B by sealing with the liquid 40 . Therefore, the switching device 200 of FIG. 4 can block the flow of coke oven gas in the second body portion 10B with high reliability while continuing to flow the coke oven gas in the first body portion 10A.

As a result, for example, maintenance of facilities such as ducts on the downstream side of the second main body portion 10B can be performed with high safety. Since the flow of coke oven gas can be continued in the first main body portion 10A, it is possible to stabilize the production of coke and stabilize the operation of various devices using coke oven gas.

FIG. 5 shows a state in which the first body portion 10A is in the blocking mode and the second body portion 10B is in the isolation mode. The droplets separated from the coke oven gas in the second main body portion 10B are continuously extracted from the liquid discharge portion 17B connected to the bottom portion of the second main body portion 10B, flowed through the pipe 19B and discharged.

On the other hand, the valve V12 is closed in the first body portion 10A. Further, the valve V16 is open, and the liquid 40 supplied from the liquid supply portion 16A to the first body portion 10A is stored in the first body portion 10A. The liquid level of the liquid 40 is higher than the discharge port of the gas introduction portion 12A, and the discharge port is positioned in the liquid 40. As shown in FIG. Such a liquid seal with the liquid 40 blocks the flow of the coke oven gas. The liquid level of the liquid 40 in the first main body portion 10A is adjusted by the height of the rising pipe 18a downstream of the liquid discharge portion 17A. The liquid seal height 18b ensures a liquid seal height equal to or greater than the difference between the maximum operating pressure of the coke oven gas and the discharge destination pressure of the pipe 18a.

For example, even if the valve V12 is not completely closed due to foreign matter, the coke oven gas can be prevented from leaking into the gas lead-out portion 14A by sealing with the liquid 40 . Therefore, the switching device 200 of FIG. 5 can block the flow of coke oven gas in the first body portion 10A with high reliability while continuing to flow the coke oven gas in the second body portion 10B.

As a result, for example, maintenance of facilities such as ducts on the downstream side of the first main body portion 10A can be performed with high safety. Since the flow of the coke oven gas can be continued in the second main body portion 10B, it is possible to stabilize the production of coke and stabilize the operation of various devices using the coke oven gas.

As shown in FIGS. 4 and 5, by operating each valve, the operation modes of the first body portion 10A and the second body portion 10B can be switched. As a result, maintenance of equipment downstream of the first main body portion 10A and the second main body portion 10B can be performed while continuing the operation of the coke oven and various devices using coke oven gas. Therefore, it is possible to stabilize the production of coke and stabilize the operation of various devices in the refining facility.

The first main body portion 10A and the second main body portion 10B may be configured to be capable of independently switching between the separation mode and the cutoff mode. In FIGS. 4 and 5, one of the first main body portion 10A and the second main body portion 10B is in the blocking mode and the other is in the separating mode, but the present invention is not limited to this. For example, when equipment maintenance is not performed, both the first main body portion 10A and the second main body portion 10B may be placed in the separation mode. Moreover, when stopping the operation of the coke oven, or when suspending the refining equipment for coke oven gas, both the first main body part 10A and the second main body part 10B may be put into the cutoff mode.

An example of the operation method of the switching device 200 includes a step a in which the separation mode is performed in the first main body portion 10A and the cut-off mode is performed in the second main body portion 10B, and the liquid used for liquid sealing is removed from the second main body portion 10B. Step b of discharging and starting introduction and extraction of coke oven gas in the second main body part 10B, switching the second main body part 10B from the interruption mode to the separation mode, and introducing the coke oven gas into the first main body part 10A c) stopping and supplying liquid to the first body portion 10A to switch the first body portion 10A from the separation mode to the blocking mode;

Step a can be performed with the switching device 200 shown in FIG. Therefore, step a can be performed based on FIG. 4 and the above description with reference to it.

Step b can be performed, for example, by the following valve operations.
- Valve V26: Change from open state to closed state.
- Valve V32: Opened from the closed state, and then closed after the liquid 40 contained in the second body portion 10B is discharged from the pipe 20B.
- Valve V29: Open from the closed state.
- Valve V28: from open state to closed state.
- Valve V22: Open from the closed state.
By the valve operation described above, the second body portion 10B becomes the separation mode.

Step c can be performed, for example, by the following valve operations.
- Valve V12: Change from open state to closed state.
- Valve V19: Switch from open to closed.
- Valve V18: Open from closed state.
- Valve V16: Open from the closed state.

By the valve operation described above, the liquid is supplied to the first body portion 10A , and the water sealing state is established. This brings the switching device 200 into the state shown in FIG. The switching apparatus 200 can then be operated based on FIG. 5 and the discussion above with reference to it.

The valve operation procedures in steps b and c do not necessarily have to be performed in order, and may be changed or performed simultaneously. The liquid 40 in the second body portion 10B used for liquid sealing in step a is discharged to the outside from the pipe 20B by opening the valve V32 in step b. The pipe 20B secures a liquid sealing height 20a greater than the difference between the maximum operating pressure of the coke oven gas and the discharge destination pressure of the pipe 20B with respect to the pipe 18B. Thereby, coke oven gas can be suppressed from flowing out to the downstream side of the pipe 20B. Note that if there is no problem even if the liquid volume inside the device on the upstream side of the switching device 200 increases, instead of discharging the liquid 40 in the second body portion 10B used for the liquid seal from the pipe 20B, It may be returned to the inside of the apparatus on the upstream side from the pipe 19B. In this case, the pipe 20B may be omitted.

The operating method switches between the operating modes of the first main body portion 10A and the second main body portion 10B in the switching device 200 described above. As a result, for example, maintenance of equipment downstream of each of the first main body portion 10A and the second main body portion 10B can be performed while the coke oven gas continues to flow. Therefore, it is possible to stabilize the production of coke and stabilize the operation of various devices using coke oven gas. Moreover, since the switching device 200 is used, the coke oven gas can be cut off with high reliability.

FIG. 6 is a diagram showing an example of coke oven gas refining equipment equipped with a switching device. The coke oven gas refining equipment 300 is equipment for refining the coke oven gas generated in the coke oven 70, and includes water-sealable ducts 52 and 54, a switching device 200, and gas-liquid contact on the upstream side of the switching device 200. A device 50 and ducts 61 and 62 downstream of the switching device 200 are provided. Examples of the gas-liquid contactor 50 include a desulfurization device and a deammonification device. A cooling device (not shown) may be provided together with the gas-liquid contact device 50 . Coke oven gas generated in the coke oven 70 flows through a duct 52 that is not water-sealed and introduced into the gas-liquid contactor 50 . Here, it is cooled or washed in alternating current contact with a liquid, for example an aqueous solution. The coke oven gas discharged from the gas-liquid contactor 50 may contain many water droplets.

Such coke oven gas is introduced into the second main body portion 10B of the switching device 200 . Since the second body portion 10B is in the separation mode, water droplets are separated from the coke oven gas introduced into the second body portion 10B. The coke oven gas, dewatered in the second body portion 10B, may flow through the duct 62 toward downstream equipment or storage tanks. Since the first body portion 10A of the switching device 200 is in the cutoff mode, the outflow of the coke oven gas to the downstream side of the first body portion 10A is cut off. If the duct 54 is water-sealed, coke oven gas does not flow into the duct 61, so maintenance can be performed by opening the duct 61 safely.

When maintenance of the duct 62 on the downstream side of the second main body portion 10B is required, the first main body portion 10A of the switching device 200 is set to the separation mode, and the second main body portion 10B is set to the cutoff mode. The switching device 200 switches the lead-out destination of the coke oven gas. Since no coke oven gas flows into the duct 62 after switching, the duct 62 can be opened for maintenance.

Since the coke oven gas refining equipment 300 includes the switching device 200, the coke oven gas can be shut off with high reliability. Further, the coke oven gas refining equipment 300 can continue operating the coke oven and refining the coke oven gas even during maintenance of the ducts 61 and 62 . This makes it possible to stabilize the production of coke and stabilize the operation of various devices in the refining facility. The switching device 200 also functions as a mist separator and a water sealing duct. Therefore, the installation space can be reduced compared to the case where both are installed.

Further, for example, when a mist separator is provided in the flow path of the duct 61 and a new duct 62 is installed, even if there is no space for installing a water sealing duct, the existing mist separator downstream of the gas-liquid contactor 50 If the separator is modified into the switching device 200, the duct 62 can be installed with high safety.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. For example, the switching device may perform another mode of operation different from the isolation mode and the blocking mode. For example, switching device 100 or switching device 110 may be provided instead of water sealable ducts 52,54. For example, the first body portion and the second body portion in the switching device 200 may include the body portion 10a shown in FIG. 3 and function as cyclones in the separation mode.

For example, the switching device may have three or more bodies. In this case, at least one main unit may be placed in the cutoff mode depending on the location where maintenance is performed. For example, when the three main bodies, ie, the first main body, the second main body, and the third main body are provided, the first main body may be set in the blocking mode, and the second main body and the third main body may be set in the isolation mode.

According to the present disclosure, a switching device capable of reducing the installation space by combining the function of a mist separator and the function of shutting off coke oven gas while having reliability of shutting off coke oven gas, and its A method of operation is provided. Further, according to the present disclosure, there is provided a coke oven gas refining facility comprising such a switching device.

DESCRIPTION OF SYMBOLS 10... Main-body part 10A... 1st main-body part 10B... 2nd main-body part 10a... Main-body part 12, 12A, 12B... Gas introduction part 14, 14A, 14B... Gas outlet part, 16, 16A, 16B... Liquid supply part 17, 17A, 17B... Liquid discharge part 18a... Pipe (rising pipe) 18b, 20a... Liquid sealing height 18, 18A, 18B, 19, 19A, 19B, 20, 20A, 20B... Pipe , 40... liquid, 50... gas-liquid contact device, 52, 54, 61, 62... duct, 70... coke oven, 100, 110, 200... switching device, 300... refining facility, V2, V6, V8, V9, V10 , V12, V16, V18, V19, V22, V26, V28, V29, V30, V32 . . . valves.

Claims (9)

A separation mode that separates droplets from the coke oven gas and a cutoff mode that cuts off the flow of the coke oven gas are configured with a switching function,
In the separation mode, the flow path of the coke oven gas is configured,
a main body that contains a liquid in the blocking mode and blocks the flow of the coke oven gas by a liquid seal ;
a gas introduction section for introducing the coke oven gas into the main body;
a gas lead-out part for leading out from the main body part the coke oven gas in which the droplets are smaller than the coke oven gas introduced from the gas lead-in part ,
The switching device, wherein in the separation mode, the coke oven gas introduced from the gas introduction section is discharged from the gas discharge section without coming into contact with the liquid in the body section. a liquid supply unit that supplies the liquid to the main body;
2. The switching device according to claim 1, further comprising a liquid discharge section for discharging said liquid from said main body section. 3. The apparatus according to claim 1 or 2, provided downstream of at least one device selected from the group consisting of a cooling device for cooling the coke oven gas and a gas-liquid contact device for contacting the coke oven gas with an aqueous solution. switching device. The switching device according to any one of claims 1 to 3, comprising a riser pipe for adjusting the liquid level of the liquid in the main body in the blocking mode. The switching device according to any one of claims 1 to 4, wherein the main body functions as a mist separator in the separation mode. The main body is composed of a plurality of parts including a first main body and a second main body,
The switching device according to any one of claims 1 to 5, wherein said first body portion and said second body portion are configured to be capable of switching between said separation mode and said cutoff mode independently of each other. 7. Switching according to claim 6, wherein when one of said first body portion and said second body portion is in said isolation mode, the other of said first body portion and said second body portion is in said blocking mode. Device. A method for operating a switching device according to claim 6 or 7,
performing the separation mode in the first body portion and performing the isolation mode in the second body portion;
discharging the liquid from the second body to initiate introduction and withdrawal of the coke oven gas in the second body and switching the second body from the shutoff mode to the separation mode;
ceasing introduction of the coke oven gas into the first body, supplying the liquid to the first body, and switching the first body from the isolation mode to the shutdown mode; how to drive. A refining facility for coke oven gas comprising the switching device according to any one of claims 1 to 5.

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