JP7623927B2 - Absorption apparatus, gas treatment apparatus, absorption method, and gas treatment method - Google Patents

Description

The present invention relates to an absorption apparatus, a gas treatment apparatus equipped with the absorption apparatus, an absorption method, and a gas treatment method in which the absorption method is carried out.

Conventionally, as disclosed in, for example, the following Patent Document 1, there is known a gas treatment device that separates acidic compounds contained in the gas to be treated by contacting the acidic compounds with a treatment liquid. In Patent Document 1, a treatment liquid that undergoes liquid phase separation into a first phase portion having a high content of acidic compounds and a second phase portion having a low content of acidic compounds is used.

The gas treatment device disclosed in Patent Document 1 includes an absorber, a heat exchanger, a regenerator, and a heat pump. The absorber brings exhaust gas (gas to be treated) containing carbon dioxide into contact with a treatment liquid. The treatment liquid is separated into a first phase portion ( _CO2- rich phase) having a high carbon dioxide content and a second phase portion ( _CO2- lean phase) having a low _CO2 content. The liquid-phase separated treatment liquid is sent to the regenerator via a heat exchanger. The heat exchanger is disposed in a flow path connecting the absorber and the regenerator, and preheats the treatment liquid heading to the regenerator. The regenerator separates carbon dioxide from the treatment liquid by heating the treatment liquid. The carbon dioxide separated from the treatment liquid is recovered through a recovery path, while the treatment liquid that has released carbon dioxide is returned to the absorber via the heat exchanger. The heat pump has a closed-loop circulation path, an evaporator disposed in the absorber, a compressor, a condenser disposed in the regenerator, and an expander. The refrigerant circulates through a circulation path in the evaporator, compressor, condenser and expander, and the heat of reaction generated by the exothermic reaction between the treatment liquid and the acidic compounds in the gas to be treated in the absorber is transported to the regenerator.

JP 2018-187553 A

In the gas treatment device disclosed in the above-mentioned Patent Document 1, contact between the gas to be treated and the treatment liquid in the absorber is achieved by spraying the treatment liquid into the flow path of the gas to be treated, or by allowing the treatment liquid to flow down through packing materials arranged in the flow path of the gas to be treated, etc. In such a configuration in which the gas to be treated and the treatment liquid are brought into contact with each other, sufficient contact is not achieved, and the heat of reaction generated when the acidic compounds are absorbed may not be recovered.

The present invention has been made in consideration of the above-mentioned conventional technology, and its purpose is to increase the amount of reaction heat recovered when absorbing acidic compounds using a treatment liquid that undergoes phase separation into a first phase portion having a high content of acidic compounds and a second phase portion having a low content of acidic compounds.

In order to achieve the above-mentioned object, the absorption apparatus of the present invention is an absorption apparatus that brings a gas to be treated containing acidic compounds into contact with a treatment liquid that undergoes phase separation due to absorption of the acidic compounds, thereby causing the treatment liquid to absorb the acidic compounds, and includes a container , a treatment liquid supply path that supplies the treatment liquid into the container, a reaction heat recovery device that is arranged inside the container so as to be immersed in the treatment liquid and recovers reaction heat generated by the treatment liquid absorbing the acidic compounds, and a gas supply path that supplies the gas to be treated into the container at a position within the height range of the reaction heat recovery device , and the treatment liquid supply path has a supply path main body that extends downward within the container relative to a connection part connected to the container, and a supply piping that is provided at the tip of the supply path main body and has a treatment liquid supply port that opens inside the container, and the treatment liquid supply port is arranged so as to be located below the liquid level of the treatment liquid during operation , and is arranged so as to be located below the liquid level of the treatment liquid during operation .

In the present invention, in the above-mentioned absorption device, the treatment liquid is stored in the container, and the gas to be treated is supplied into the treatment liquid through the gas supply path from a position within the height range of the reaction heat recovery device immersed in the treatment liquid. This makes it possible to prevent the gas to be treated from passing through the container without coming into contact with the treatment liquid. Therefore, the reaction heat increases as the treatment liquid and the acidic compounds in the gas to be treated react sufficiently, and the amount of reaction heat recovered by the reaction heat recovery device can be increased. In addition, since the treatment liquid is stored in the container so that the reaction heat recovery device is immersed in the treatment liquid, it is possible to prevent the reaction heat recovery device from being exposed from the treatment liquid even if the liquid level fluctuates. In other words, since the reaction heat recovery device can be maintained in a state of being immersed in the treatment liquid, it is possible to prevent a decrease in the amount of reaction heat recovered by the reaction heat recovery device.

In addition, because the treatment liquid supply port supplies the treatment liquid from below the liquid level, and the gas to be treated is supplied from a position within the height range of the reaction heat recovery device immersed in the treatment liquid, the reaction heat generated near the treatment liquid supply port is easily transferred to the reaction heat recovery device. This makes it possible to increase the amount of reaction heat recovered by the reaction heat recovery device.

Moreover, since the treatment liquid supply port is disposed closer to the reaction heat recovery vessel than the connection portion where the treatment liquid supply passage is connected to the vessel, even if the connection portion where the treatment liquid supply passage is connected to the vessel is distant from the reaction heat recovery vessel, the treatment liquid supply port can be disposed closer to the reaction heat recovery vessel than the connection portion, thereby increasing the amount of reaction heat recovered by the reaction heat recovery vessel.

The treatment liquid supply port may be located between the liquid level and the upper end of the reaction heat recovery device. In this embodiment, the treatment liquid supply port can be located closer to the upper end of the reaction heat recovery device than when the treatment liquid supply port is located above the liquid level of the treatment liquid. Therefore, the reaction heat generated in greater amounts near the treatment liquid supply port can be efficiently transferred to the upper end of the reaction heat recovery device, and more reaction heat can be recovered by the upper end.

The absorption apparatus of the present invention is an absorption apparatus that brings a gas to be treated containing acidic compounds into contact with a treatment liquid that undergoes phase separation due to absorption of the acidic compounds, thereby causing the treatment liquid to absorb the acidic compounds, and comprises a container, a treatment liquid supply path that supplies the treatment liquid into the container, a reaction heat recovery device that is arranged inside the container so as to be immersed in the treatment liquid and recovers reaction heat generated by the treatment liquid absorbing the acidic compounds, and a gas supply path that supplies the gas to be treated into the container at a position within the height range of the reaction heat recovery device, and the treatment liquid supply path has a supply path main body that extends inside the container from a connection part connected to the container, and a supply piping that is provided at the tip of the supply path main body and has a treatment liquid supply port that opens inside the container, and the treatment liquid supply port is arranged within the height range of the reaction heat recovery device and is arranged so as to be below the liquid level of the treatment liquid during operation .
In the present invention, in the above-mentioned absorption apparatus, the treatment liquid is stored in the container, and the gas to be treated is supplied into the treatment liquid through the gas supply path from a position within the height range of the reaction heat recovery device immersed in the treatment liquid. Therefore, it is possible to prevent the gas to be treated from passing through the container without contacting the treatment liquid. Therefore, the reaction heat increases as the treatment liquid and the acidic compounds in the gas to be treated react sufficiently, and the amount of reaction heat recovered by the reaction heat recovery device can be increased. In addition, since the treatment liquid is stored in the container so that the reaction heat recovery device is immersed in the treatment liquid, it is possible to prevent the reaction heat recovery device from being exposed from the treatment liquid even when the liquid level fluctuates. In other words, since the reaction heat recovery device can be maintained in a state of being immersed in the treatment liquid, it is possible to prevent a decrease in the amount of reaction heat recovered by the reaction heat recovery device.
In addition, since the treatment liquid supply port supplies the treatment liquid from below the liquid level and the gas to be treated is supplied from a position within the height range of the reaction heat recovery device immersed in the treatment liquid, the reaction heat generated near the treatment liquid supply port is easily transferred to the reaction heat recovery device, thereby increasing the amount of reaction heat recovered by the reaction heat recovery device.
In addition , by arranging the treatment liquid supply port within the height range of the reaction heat recovery device, the treatment liquid recovery port can be brought closer to the reaction heat recovery device, thereby increasing the amount of reaction heat recovered by the reaction heat recovery device.

The treatment liquid supply port may be disposed at or near the lower end of the reaction heat recovery vessel. In this embodiment, the treatment liquid supply port supplies the treatment liquid at or near the lower end of the reaction heat recovery vessel, and the gas to be treated is supplied from a position within the height range of the reaction heat recovery vessel immersed in the treatment liquid. This allows the treatment liquid to absorb acidic compounds near the reaction heat recovery vessel, and the reaction heat generated by this absorption can be recovered.

The absorption device may further include a serpentine section disposed inside the container so as to be immersed in the treatment liquid, causing the gas to rise in the treatment liquid while meandering. In this embodiment, the serpentine section causes the gas to rise in the treatment liquid while meandering, thereby making it possible to lengthen the residence time of the gas to be treated in the treatment liquid compared to when the gas to be treated rises immediately in the treatment liquid. This increases the contact time between the treatment liquid and the gas to be treated. As a result, more acidic compounds in the gas to be treated are absorbed by the treatment liquid, generating more reaction heat.

The absorption device may further include a dispersion section that is disposed inside the container so as to be immersed in the treatment liquid and disperses the gas to be treated by passing the gas through it. In this embodiment, the surface area of the gas to be treated can be increased by dispersing the gas to be treated using the dispersion section. This increases the contact area between the treatment liquid and the gas to be treated, so that more acidic compounds in the gas to be treated are absorbed by the treatment liquid, generating more reaction heat.

The absorption apparatus according to the present invention is an absorption apparatus for bringing a gas to be treated containing acidic compounds into contact with a treatment liquid which undergoes phase separation due to absorption of the acidic compounds, thereby causing the treatment liquid to absorb the acidic compounds, and is provided with a container, a treatment liquid supply passage for supplying the treatment liquid into the container, a reaction heat recovery device disposed inside the container so as to be immersed in the treatment liquid and for recovering reaction heat generated when the treatment liquid absorbs the acidic compounds, and a gas supply passage for supplying the gas to be treated into the container at a position within the height range of the reaction heat recovery device, and the container has an absorption section which is filled with the treatment liquid when the reaction heat recovery device is housed therein and which is open upward, and a gas supply passage for recovering the treatment liquid overflowing from the upper end opening of the absorption section. The vessel has an expansion section which forms a space between the absorption section and the treatment liquid, a first discharge section which is connected to the absorption section, and a second discharge section which is arranged at a higher position than the first discharge section in the vertical direction, and in the absorption section of the vessel, the treatment liquid which has come into contact with the gas to be treated undergoes phase separation into a first phase portion which has a high content of acidic compounds and a second phase portion which has a low content of acidic compounds and a lower specific gravity than the first phase portion, the second discharge section discharges the treatment liquid including the second phase portion which has overflowed from the absorption section, the first discharge section discharges the treatment liquid other than the treatment liquid discharged through the second discharge section, and the treatment liquid supply port is arranged so as to be located below the liquid level of the treatment liquid in the absorption section during operation.
In the present invention, in the above-mentioned absorption apparatus, the treatment liquid is stored in the container, and the gas to be treated is supplied into the treatment liquid through the gas supply path from a position within the height range of the reaction heat recovery device immersed in the treatment liquid. Therefore, it is possible to prevent the gas to be treated from passing through the container without contacting the treatment liquid. Therefore, the reaction heat increases as the treatment liquid and the acidic compounds in the gas to be treated react sufficiently, and the amount of reaction heat recovered by the reaction heat recovery device can be increased. In addition, since the treatment liquid is stored in the container so that the reaction heat recovery device is immersed in the treatment liquid, it is possible to prevent the reaction heat recovery device from being exposed from the treatment liquid even when the liquid level fluctuates. In other words, since the reaction heat recovery device can be maintained in a state of being immersed in the treatment liquid, it is possible to prevent a decrease in the amount of reaction heat recovered by the reaction heat recovery device.
In addition, since the treatment liquid supply port supplies the treatment liquid from below the liquid level and the gas to be treated is supplied from a position within the height range of the reaction heat recovery device immersed in the treatment liquid, the reaction heat generated near the treatment liquid supply port is easily transferred to the reaction heat recovery device, thereby increasing the amount of reaction heat recovered by the reaction heat recovery device.
Moreover , by taking out the first and second phases, which are phase-separated in the treatment liquid that has come into contact with the gas to be treated, from the container through the first and second discharge parts, respectively, the ratio of the first and second phases in the taken-out treatment liquid can be stabilized. That is, in the container, the treatment liquid that has come into contact with the gas to be treated that contains acidic compounds is phase-separated into a first phase having a high content of acidic compounds and a second phase having a low content of acidic compounds. Since the second phase has a smaller specific gravity than the first phase, the second phase is present at a higher position in the container than the first phase. Then, the treatment liquid mainly containing the first phase is taken out from the container through the first discharge part, and the treatment liquid mainly containing the second phase is taken out from the container through the second discharge part. Thus, the ratio of the first phase and the second phase can be stabilized in the treatment liquid containing the first and second phases taken out from the container.

In addition , by allowing the second phase portion, which has a smaller specific gravity than the first phase portion, to overflow from the main body portion, the treatment liquid mainly containing the second phase portion can be removed from the container through the second discharge portion, and the treatment liquid mainly containing the first phase portion can be removed from the container through the first discharge portion.

The reaction heat recovery device may further include an inlet chamber connected to the outer surface of the bottom of the container, through which a refrigerant for recovering the reaction heat is introduced into the reaction heat recovery device, and an outlet chamber through which the refrigerant is discharged from the reaction heat recovery device. The reaction heat recovery device may have an inverted U-shaped tube that stands vertically from the inner surface of the bottom, with one end of the tube communicating with the inlet chamber and the other end of the tube communicating with the outlet chamber. In this embodiment, since the reaction heat recovery device stands vertically on the inner surface of the bottom of the container, both ends of the inverted U-shape can be connected to the inlet chamber and the outlet chamber connected to the outer surface of the bottom of the container. In addition, since the reaction heat recovery device stands vertically, the reaction heat generated by contact between the treatment liquid and the gas to be treated can be sufficiently recovered over the vertical length range of the reaction heat recovery device.

The gas treatment device according to the present invention includes the above-mentioned absorption device, a regeneration device that heats the treatment liquid that has come into contact with the gas to be treated to separate the acidic compounds, and a liquid delivery section that delivers the treatment liquid that has come into contact with the gas to be treated in the container to the regeneration device.

The present invention makes it possible to increase the amount of reaction heat recovered in the absorption device while separating acidic compounds from the treatment liquid that has come into contact with the gas to be treated.

As described above, according to the present invention, it is possible to increase the amount of reaction heat recovered when absorbing acidic compounds using a treatment liquid that undergoes phase separation into a first phase portion having a high content of acidic compounds and a second phase portion having a low content of acidic compounds.

1 is a diagram illustrating an overall configuration of a gas treatment device according to a first embodiment of the present invention. FIG. 4 is a diagram illustrating an overall configuration of a gas treatment device according to a second embodiment of the present invention. FIG. 13 is a diagram illustrating an overall configuration of a gas treatment device according to a modified example of the second embodiment of the present invention. FIG. 13 is a diagram illustrating an overall configuration of a gas treatment device according to a third embodiment of the present invention. FIG. 4 is a schematic diagram showing the configuration of an absorption device according to another embodiment of the present invention. FIG. 2 is a diagram illustrating an overall configuration of a gas treatment device according to another embodiment of the present invention.

The following describes in detail the embodiment of the present invention with reference to the drawings.

First Embodiment
The gas treatment device 10 according to the first embodiment is a gas treatment device that separates acidic compounds from a gas to be treated that contains the acidic compounds by using a treatment liquid that undergoes phase separation due to absorption of the acidic compounds.

As shown in FIG. 1, the gas treatment device 10 includes an absorption device 20, a regeneration device 30, a circulation path 40, a heat exchanger 50, and a heat transfer section 60. The circulation path 40 includes a first flow path 41 that introduces the treated liquid extracted from the absorption device 20 into the regeneration device 30, and a second flow path 42 that extracts the treated liquid from the regeneration device 30 and returns it to the absorption device 20. A pump 46 is provided in the second flow path 42, and a pump 55 is provided in the first flow path 41. Note that, when a separate heat exchange destination is provided as in FIG. 6 (in the example of FIG. 6, the heat exchange destination of the refrigerant in the outlet chamber 25 is the regeneration device 30), the heat exchanger 50 can be omitted.

The absorption device 20 brings the gas to be treated into contact with the treatment liquid, thereby absorbing the acidic compounds in the gas to be treated into the treatment liquid, and discharges the gas from which the acidic compounds have been removed. The absorption device 20 includes an absorption vessel (vessel) 21, an inlet chamber 24, and an outlet chamber 25.

The absorption container 21 includes a main body portion 22 and an expansion portion 23 that is connected to cover the main body portion 22 from above and is wider than the main body portion 22.

The main body 22 is configured as a bottomed cylinder having a height in the vertical direction, with a bottom 22a, a side 22b extending upward from the periphery of the bottom 22a, and an upper end opening 22c that opens upward at the upper end of the side 22b.

The widening portion 23 is configured in a lid shape wider than the main body portion 22 so as to cover the upper end opening 22c. The widening portion 23 has a lower end 23a connected to the periphery of the main body portion 22, a side portion 23b extending upward from the lower end 23a, and an upper portion 23c connected to the upper end so as to seal the upper end of the side portion 23b. The lower end 23a of the widening portion 23 extends circumferentially along the outer surface of the side portion 22b of the main body portion 22 below the upper end opening 22c. In this embodiment, the lower end 23a of the widening portion 23 is below the upper end opening 22c and is connected to the outer surface of the side portion 22b of the main body portion 22 above the center of the side portion 22b of the main body portion 22 in the vertical direction. A space S1 is provided between the outer surface of the side portion 22b of the main body portion 22 and the inner surface of the side portion 23b of the widening portion 23. In addition, a space S2 is provided between the upper end opening 22c and the inner surface of the upper portion 23c of the widening portion 23.

A reaction heat recovery device 60a is disposed inside the main body 22. The reaction heat recovery device 60a has a tube that penetrates the bottom 22a and allows a refrigerant to flow inside. In this embodiment, the tube is in an inverted U shape and stands vertically from the inner surface of the bottom 22a of the main body 22. Both ends of the inverted U shape of the tube are connected to the inlet chamber 24 and the outlet chamber 25, respectively. That is, one end of the tube is connected to the inlet chamber 24, and the refrigerant is introduced from the inlet chamber 24 through one end of the tube into the tube. The other end of the tube is connected to the outlet chamber 25, and the refrigerant in the tube is discharged to the outlet chamber 25 through the other end of the tube. The reaction heat recovery device 60a is composed of, for example, a bundle of multiple inverted U-shaped tubes.

The vertical length of the reaction heat recovery device 60a, i.e., the length from the lower end to the upper end of the inverted U-shape, is shorter than the vertical length of the main body 22 so that the reaction heat recovery device 60a is housed inside the main body 22. The width of the reaction heat recovery device 60a is smaller than the width of the main body 22, and the reaction heat recovery device 60a is positioned so as to be spaced apart from the inner surface of the side portion 22b of the main body 22.

A plurality of baffle plates 70 are attached to the inner surface of the main body 22 in a staggered arrangement. The baffle plates 70 form a serpentine section that causes the fluid containing the gas to be treated and the treatment liquid in the main body 22 to rise in a serpentine manner. The baffle plates 70 have a first plate member extending from one inner surface of the side portion 22b to the other inner surface in a vertical cross section, and a second plate member extending from the other inner surface to the one inner surface, and the first plate member and the second plate member are arranged alternately. As a result, a serpentine flow path is formed in the main body 22. Here, the "vertical cross section" refers to a cross section in the direction along the paper surface of FIG. 1.

The baffles 70 are arranged around the reaction heat recovery vessel 60a so as not to interfere with the reaction heat recovery vessel 60a. For example, the first plate member may have a shape surrounding about half of the reaction heat recovery vessel 60a on one inner surface, and the second plate member may have a shape surrounding about half of the reaction heat recovery vessel 60a on the other inner surface. However, the present invention is not limited to this, and the baffles 70 may also be arranged inside the reaction heat recovery vessel 60a.

The main body 22 is connected to a gas supply line 11 that supplies the gas to be treated, such as a process gas, and a first exhaust section 14 that exhausts a portion of the treatment liquid from the main body 22. The gas supply line 11 is connected to the main body 22 at a position within the height range of the reaction heat recovery device 60a. In this embodiment, the gas supply line 11 is connected to the bottom 22a of the main body 22 corresponding to the lower end or the vicinity of the lower end of the reaction heat recovery device 60a, or to a side section 22b near the bottom 22a. The first exhaust section 14 is connected to the side section 22b near the bottom 22a.

The widening section 23 is connected to a gas exhaust passage 12 that exhausts gas after processing, a second exhaust section 15 that exhausts a portion of the processing liquid from the widening section 23, and a second flow path 42. The gas exhaust passage 12 is connected to the upper part 23c of the widening section 23. The second exhaust section 15 is located higher in the vertical direction than the first exhaust section 14 and is connected to a position that communicates with the space S1. The second flow path 42 is connected to the side part 23b of the widening section 23. Note that the piping such as the gas exhaust passage 12, the second exhaust section 15, and the second flow path 42 being "connected" to an object such as the widening section 23 includes, for example, the piping penetrating the object to connect the space within the piping to the space within the object.

A treatment liquid supply passage 13 that supplies the treatment liquid to the main body 22 is provided within the widening section 23. The treatment liquid supply passage 13 has a supply passage main body 13a and a supply pipe provided at the tip of the supply passage main body 13a. The supply passage main body 13a is connected to the second flow path 42. In this embodiment, the supply passage main body 13a is connected to the second flow path 42 at the side portion 23b of the widening section 23. The connection portion (through portion) 16 between the supply passage main body 13a and the widening section 23 is provided at a position higher than the height position of the upper end opening 22c.

The supply path main body 13a is configured to extend from the connection portion 16 into the main body 22. Specifically, the supply path main body 13a extends from the connection portion 16 to above the upper end opening 22c, and also extends downward from above the upper end opening 22c toward the inside of the main body 22.

The supply pipe is provided with a treatment liquid supply port 13b. The treatment liquid supply port 13b may be a single opening formed in the supply pipe, but in this embodiment, it is a plurality of downward openings intermittently formed along the extension direction of the supply pipe. The treatment liquid supply port 13b opens in the main body 22. The treatment liquid supply port 13b is arranged so as to be located below the liquid level of the treatment liquid stored in the main body 22 during operation of the absorption device 20. In this embodiment, the treatment liquid supply port 13b is arranged in the main body 22 between the liquid level of the treatment liquid and the upper end of the reaction heat recovery device 60a during operation of the absorption device 20. The treatment liquid supply port 13b is arranged in the main body 22 at a position closer to the reaction heat recovery device 60a than the connection portion 16. In a top view, the area in which the treatment liquid supply port 13b is formed in the supply pipe overlaps with the reaction heat recovery device 60a.

The main body 22 corresponds to the absorption section 28, which is filled with the treatment liquid and opens upward while housing the reaction heat recovery device 60a.

The absorbing device 20 is provided with a level gauge 75 that measures the level of the treatment liquid in the space S1. In this embodiment, the level gauge 75 is connected to the side 23b of the widening section 23 so as to communicate with the space S1. The level gauge 75 is electrically connected to the treatment liquid amount control section 76. The treatment liquid amount control section 76 controls the amount of treatment liquid supplied to the main body section 22 from the treatment liquid supply port 13b. In this embodiment, the treatment liquid amount control section 76 compares the level of the treatment liquid in the space S1 measured by the level gauge 75 with a predetermined liquid level threshold, and controls the pump 46 and the pump 55 so that the level of the treatment liquid becomes the predetermined liquid level threshold. As a result, the ratio between the amount of treatment liquid supplied to the main body section 22 and the amount of treatment liquid discharged from the absorption container 21 through the first discharge section 14 and the second discharge section 15 roughly matches, and the liquid level falls within a predetermined range.

A gas flow meter 77 is attached to the gas supply path 11 to measure the flow rate of the gas to be treated supplied to the main body 22. A refrigerant amount control unit 78 is electrically connected to the gas flow meter 77. The refrigerant amount control unit 78 compares the flow rate of the gas to be treated measured by the gas flow meter 77 with a predetermined gas amount threshold, and controls the rotation speed of the compressor 60c and pump 60d of the heat transfer unit 60 described later based on the comparison result. For example, when the flow rate of the gas to be treated exceeds the predetermined gas amount threshold, the refrigerant amount control unit 78 increases the rotation speed of the compressor 60c and pump 60d to increase the amount of liquid refrigerant supplied from the inlet chamber 24 to the reaction heat recovery unit 60a. On the other hand, when the flow rate of the gas to be treated falls below the predetermined gas amount threshold, the refrigerant amount control unit 78 decreases the rotation speed of the compressor 60c and pump 60d to reduce the amount of liquid refrigerant supplied from the inlet chamber 24 to the reaction heat recovery unit 60a. As a result, the amount of refrigerant is adjusted according to the amount of gas to be treated supplied to the main body 22. If sufficient pressure is ensured in compressor 60c, pump 60d is not necessary.

The regeneration device 30 is connected to a first flow path 41 and a second flow path 42. The first flow path 41 is connected to the upper part of the regeneration device 30, and introduces the treatment liquid discharged from the pump 55 into the regeneration device 30. The second flow path 42 is connected to the lower end or near the lower end of the regeneration device 30, and discharges the treatment liquid stored in the regeneration device 30.

The regeneration device 30 stores the treatment liquid and heats the stored treatment liquid to desorb the acidic compounds. The desorption of the acidic compounds from the treatment liquid is an endothermic reaction. When the regeneration device 30 heats the treatment liquid, not only does the acidic compounds desorb, but the water in the treatment liquid also evaporates.

The regeneration device 30 is connected to a supply line 80 and a heating flow path 82. The supply line 80 supplies the acidic compounds obtained in the regeneration device 30 to the destination. The supply line 80 is provided with a condenser 84 that cools a mixed gas of the acidic compound gas evaporated from the treatment liquid and water vapor. When the mixed gas is cooled, the water vapor condenses, and the water vapor can be separated. The separated water vapor is returned to the regeneration device 30. The condenser 84 can be a heat exchanger that uses inexpensive cooling water such as river water.

One end of the heating flow path 82 is connected to the second flow path 42, but may be connected to the lower end or near the lower end of the regeneration device 30. The other end of the heating flow path 82 is connected to the lower part of the regeneration device 30. The heating flow path 82 is provided with a reboiler 86 that heats the treatment liquid stored in the regeneration device 30. The reboiler 86 may be arranged to heat the treatment liquid inside the regeneration device 30, but as shown in the figure, it may be configured to heat the treatment liquid extracted from the regeneration device 30 to the outside. In this case, the reboiler 86 can be arranged in the heating flow path 82 that returns the treatment liquid to the regeneration device 30 after heating. Note that the reboiler 86 can be one that directly or indirectly heats the treatment liquid using any heat source such as electricity, steam, or a burner.

The heat transfer section 60 transfers the refrigerant in the outlet chamber 25 to the heat exchanger 50. The heat transfer section 60 is equipped with a closed-loop circulation flow path 60b in which the refrigerant is sealed. In the circulation flow path 60b, the inlet chamber 24, the reaction heat recovery device 60a, the outlet chamber 25, the compressor 60c, the heat exchanger 50, the pump 60d, and the expansion mechanism 60e are arranged in this order. A condenser 60f is arranged in the heat exchanger 50. Note that the pump 60d can be omitted.

The heat exchanger 50 is connected to the first flow path 41, the second flow path 42, and the circulation flow path 60b, and exchanges heat between the treatment liquid flowing through the first flow path 41, the treatment liquid flowing through the second flow path 42, and the refrigerant flowing through the circulation flow path 60b. The heat exchanger 50 is, for example, a plate heat exchanger, but can also be a microchannel heat exchanger capable of exchanging heat between fluids with a relatively small temperature difference. This can improve energy efficiency.

The acidic compounds separated by the gas processing device 10 are not particularly limited as long as they produce an acidic aqueous solution, but examples include hydrogen chloride, carbon dioxide, sulfur dioxide, and carbon disulfide.

The treatment liquid used in the gas treatment device 10 is an absorbent capable of reversibly absorbing and desorbing acidic compounds. The treatment liquid is, for example, an alkaline absorbent containing water, an amine compound, and an organic solvent. It is desirable to use 30 wt% amine compound, 60 wt% organic solvent, and 10 wt% water.

Examples of the amine compound include primary amines such as 2-aminoethanol (MEA: solubility parameter = 14.3 (cal/cm ³ ) ^1/2 ) and 2-(2-aminoethoxy)ethanol (AEE: solubility parameter = 12.7 (cal/cm ³ ) ^1/2 ); secondary amines such as 2-(methylamino)ethanol (MAE), 2-(ethylamino)ethanol (EAE), and 2-(butylamino)ethanol (BAE); and tertiary amines such as triethanolamine (TEA), N-methyldiethanolamine (MDEA), tetramethylethylenediamine (TEMED), pentamethyldiethylenetriamine (PMDETA), hexamethyltriethylenetetramine, and bis(2-dimethylaminoethyl)ether.

Examples of organic solvents include 1-butanol (solubility parameter=11.3 (cal/cm ³ ) ^1/2 ), 1-pentanol (solubility parameter=11.0 (cal/cm ³ ) ^1/2 ), octanol, diethylene glycol diethyl ether (DEGDEE), diethylene glycol dimethyl ether (DEGDME), and the like, and a mixture of two or more kinds of these may be used.

Next, a gas treatment method using the gas treatment device 10 will be described. The gas treatment method includes an absorption method in which the acidic compounds contained in the gas to be treated are absorbed into a treatment liquid in an absorption device 20, and a regeneration method in which the acidic compounds are released from the treatment liquid by heating in a regeneration device 30.

In the absorption method, the treatment liquid is supplied to the absorption device 20 from the second flow path 42 while the reaction heat recovery device 60a and the multiple baffles 70 are immersed in the treatment liquid in the main body 22 (absorption section 28). That is, the treatment liquid introduced from the second flow path 42 is supplied into the absorption section 28 through the treatment liquid supply port 13b of the treatment liquid supply path 13. At this time, the treatment liquid supply port 13b is in a state of being immersed in the treatment liquid in the absorption section 28. The treatment liquid in the absorption section 28 flows from the upper end opening 22c of the absorption section 28 into the space S1 of the overflow widening section 23. That is, the side portion 22b of the absorption section 28 (main body 22) located inside the widening section 23 plays the role of a weir that stores the treatment liquid in the absorption section 28 until the treatment liquid overflows from the upper end opening 22c into the space S1.

In addition, in the absorption device 20, the gas to be treated is supplied while the treatment liquid is being supplied. That is, the gas to be treated is supplied from the lower end or near the lower end of the reaction heat recovery device 60a through the gas supply path 11. In addition, the amount of liquid refrigerant introduced from the inlet chamber 24 to the reaction heat recovery device 60a is controlled by the refrigerant amount control unit 78 based on the flow rate of the gas to be treated measured by the gas flow meter 77.

When the gas to be treated is supplied into the treatment liquid, the gas to be treated comes into contact with the treatment liquid, and the acidic compounds in the gas to be treated are absorbed into the treatment liquid. Specifically, when the treatment liquid is stored in the absorption section 28, the gas to be treated in the form of bubbles rises in the treatment liquid from the lower end or near the lower end of the reaction heat recovery device 60a due to buoyancy. In this embodiment, the gas to be treated rises in the treatment liquid while meandering due to the multiple baffle plates 70. This increases the contact time between the treatment liquid and the gas to be treated compared to when the gas to be treated rises instantly in the treatment liquid. Therefore, more acidic compounds in the gas to be treated are absorbed into the treatment liquid.

When the treatment liquid absorbs the acidic compounds in the gas to be treated, the reaction is an exothermic reaction, and reaction heat is generated. The reaction heat recovery device 60a recovers this reaction heat. That is, the liquid refrigerant introduced into the reaction heat recovery device 60a from the inlet chamber 24 is vaporized by the reaction heat to become a gaseous refrigerant, and the reaction heat recovery device 60a recovers the reaction heat. The gaseous refrigerant is discharged from the reaction heat recovery device 60a to the outlet chamber 25. The multiple baffle plates 70 increase the residence time of the gas to be treated in the treatment liquid, so that the reaction heat recovery device 60a can recover more reaction heat.

In addition, in this embodiment, the area in which the treatment liquid supply port 13b is formed in the supply piping overlaps with the reaction heat recovery device 60a when viewed from above, so the treatment liquid is supplied through the treatment liquid supply port 13b over the entire width of the reaction heat recovery device 60a. Therefore, the lean treatment liquid is brought into contact with the gas to be treated near the reaction heat recovery device 60a, and the reaction heat can be recovered by the reaction heat recovery device 60a.

The treatment liquid that comes into contact with the gas to be treated undergoes phase separation into a first phase portion having a high content of acidic compounds and a second phase portion having a low content of acidic compounds. The specific gravity of the second phase portion is smaller than that of the first phase portion. Therefore, the second phase portion flows toward the upper portion of the absorption section 28, overflows from the upper end opening 22c of the absorption section 28, flows into the space S1 in the widening section 23, and accumulates in the space S1. The treatment liquid containing mainly the second phase portion is removed from the widening section 23 through the second discharge section 15. On the other hand, the first phase portion flows toward the lower portion of the absorption section 28, and the treatment liquid containing mainly the first phase portion is removed from the absorption section 28 through the first discharge section 14. In this way, by allowing the second phase portion, which has a smaller specific gravity than the first phase portion, to overflow from the absorption section 28 and be introduced into the space S1 of the widening section 23, the treatment liquid containing mainly the second phase portion can be removed from the absorption section 28 through the second discharge section 15, and the treatment liquid containing mainly the first phase portion can be removed from the absorption section 28 through the first discharge section 14. Therefore, the ratio of the first phase portion to the second phase portion can be stabilized in the treatment liquid containing the first phase portion and the second phase portion removed from the absorption section 28.

Next, the treated liquid separated into liquid phases in the absorption device 20 is sent to the regeneration device 30. Specifically, the treated liquid containing mainly the first phase portion extracted from the absorption section 28 through the first discharge section 14 and the treated liquid containing mainly the second phase portion extracted from the absorption section 28 through the second discharge section 15 are merged and sent to the regeneration device 30 through the first flow path 41 by the pump 55. In other words, the entire amount of the treated liquid extracted from the absorption device 20 is introduced into the regeneration device 30. The treated liquid is heated by the heat exchanger 50 before being introduced into the regeneration device 30.

The gaseous refrigerant discharged from the reaction heat recovery device 60a to the outlet chamber 25 is compressed by the compressor 60c and flows into the condenser 60f in the heat exchanger 50. The gaseous refrigerant flowing through the condenser 60f heats the treatment liquid flowing through the first flow path 41, lowering its temperature and condensing. This condensed liquid refrigerant is pumped by the pump 60d, expanded by the expansion mechanism 60e, and flows into the reaction heat recovery device 60a through the inlet chamber 24. This circulation of the refrigerant heats the treatment liquid sent to the regeneration device 30 with the reaction heat of the absorption device 20. Therefore, the regeneration energy required for regeneration can be reduced by using the heat transfer unit 60. The pump 60d can be omitted.

In the regeneration method, the treatment liquid introduced into the regeneration device 30 is heated to separate the acidic compounds from the treatment liquid. In the regeneration device 30, the treatment liquid in a state in which the first phase and the second phase are mixed is heated while flowing down. This separates the acidic compounds from the treatment liquid. Furthermore, water vapor evaporated from the treatment liquid may be obtained. The acidic compounds and water vapor separated from the treatment liquid flow through the supply path 80. In the supply path 80, the water vapor is condensed in the condenser 84 and returned to the regeneration device 30. Therefore, only the acidic compounds separated from the treatment liquid are supplied to the supply destination. The treatment liquid stored in the regeneration device 30 flows through the second flow path 42 and returns to the absorption device 20. The heat of the treatment liquid flowing through the second flow path 42 is used in the heat exchanger 50 to heat the treatment liquid flowing through the first flow path 41, so the temperature of the treatment liquid decreases.

In addition, by introducing the entire treatment liquid containing the first phase portion and the treatment liquid containing the second phase portion into the regeneration device 30 and returning it to a single-phase treatment liquid, the ratio of the solvent contained in the first phase portion to the solvent contained in the second phase portion in the treatment liquid returned to a single phase can be stabilized. For example, when the treatment liquid is an alkaline absorbent containing water, an amine compound, and an organic solvent, the ratio of water, the amine compound, and the organic solvent can be stabilized.

As described above, in the first embodiment, the treatment liquid is stored in the absorption vessel 21, and the gas to be treated is supplied into the treatment liquid through the gas supply path 11 at a position within the height range of the reaction heat recovery device 60a immersed in the treatment liquid. Therefore, it is possible to prevent the gas to be treated from passing through the absorption vessel 21 without contacting the treatment liquid. Therefore, the reaction heat increases as the treatment liquid and the acidic compounds in the gas to be treated react sufficiently, so that the amount of reaction heat recovered by the reaction heat recovery device 60a can be increased. Since the treatment liquid is stored in the absorption vessel 21 so that the reaction heat recovery device 60a is immersed in the treatment liquid, it is possible to prevent the reaction heat recovery device 60a from being exposed from the treatment liquid even when the liquid level fluctuates. In other words, since the reaction heat recovery device 60a can be maintained in a state of being immersed in the treatment liquid, it is possible to prevent a decrease in the amount of reaction heat recovered by the reaction heat recovery device 60a .

In addition, since the treatment liquid is supplied from the treatment liquid supply port 13b arranged between the liquid level of the treatment liquid and the upper end of the reaction heat recovery device 60a, the reaction heat generated near the treatment liquid supply port 13b is easily transferred to the reaction heat recovery device 60a. Therefore, the amount of reaction heat recovered by the reaction heat recovery device 60a can be increased. That is, a lean treatment liquid with a high absorption rate of acidic compounds in the gas to be treated is supplied to the absorption vessel 21 from the treatment liquid supply port 13b. Therefore, a lot of reaction heat is generated by the treatment liquid absorbing a lot of acidic compounds in the gas to be treated near the treatment liquid supply port 13b. Therefore, compared to the case where the treatment liquid supply port 13b is arranged at a position above the liquid level of the treatment liquid, the reaction heat generated more near the treatment liquid supply port 13b can be efficiently transferred to the reaction heat recovery device 60a, and more reaction heat can be recovered by the reaction heat recovery device 60a. In addition, the contact time between the treatment liquid and the gas to be treated is increased by the multiple baffle plates 70, so that the amount of reaction heat recovered by the reaction heat recovery device 60a can be increased.

In addition, in this embodiment, since the treatment liquid supply path 13 extends from the connection portion 16 with the widening portion 23 into the absorption section 28, even if the connection portion 16 is far from the reaction heat recovery device 60a, the treatment liquid supply port 13b can be brought closer to the reaction heat recovery device 60a than the connection portion 16. Therefore, the treatment liquid can be supplied to a position closer to the reaction heat recovery device 60a, and the amount of reaction heat recovered by the reaction heat recovery device 60a can be increased.

Furthermore, because the reaction heat recovery device 60a stands vertically, the reaction heat generated by contact between the treatment liquid and the gas to be treated can be sufficiently recovered over the vertical length range of the reaction heat recovery device 60a in the direction in which the gas to be treated rises.

In addition, because the absorption device 20 is configured in a vertically elongated tower shape, the time that the gas to be treated is in contact with the treatment liquid can be extended, allowing more reaction heat to be generated and recovered.

Second Embodiment
2 shows a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The absorption device 20 according to the second embodiment differs from the absorption device 20 according to the first embodiment in the position of the treatment liquid supply port 13b.

The treatment liquid supply port 13b only needs to be positioned below the liquid level of the treatment liquid in the main body 22 (absorption section 28), and in the absorption device 20 according to the second embodiment, the treatment liquid supply port 13b is positioned within the height range of the reaction heat recovery device 60a. In other words, the treatment liquid supply port 13b is positioned between the upper and lower ends of the reaction heat recovery device 60a. By moving the treatment liquid supply port 13b closer to the reaction heat recovery device 60a, the amount of reaction heat recovered by the reaction heat recovery device 60a can be increased.

In this embodiment, the second flow path 42 is connected to a portion (connection portion 16) within the height range of the reaction heat recovery device 60a in the main body 22 so that the treatment liquid supply port 13b is positioned within the height range of the reaction heat recovery device 60a. The supply path main body 13a is connected to the second flow path 42 at the connection portion 16 and extends from the connection portion 16 into the main body 22. The treatment liquid supply port 13b opens at the tip of the supply path main body 13a and is located within the height range of the reaction heat recovery device 60a. The supply path main body 13a and the treatment liquid supply port 13b are arranged so as not to interfere with the reaction heat recovery device 60a. That is, in the case of the example of FIG. 2, the supply path main body 13a extends from the connection portion 16 to the inside of the reaction heat recovery device 60a so as not to interfere with the reaction heat recovery device 60a, and the treatment liquid supply port 13b is located inside the reaction heat recovery device 60a. However, this is not limited to the above, and the supply path main body 13a may extend from the connection portion 16 to just before the reaction heat recovery device 60a, and the treatment liquid supply port 13b may be located just before the reaction heat recovery device 60a. In the example of FIG. 2, the treatment liquid supply port 13b is one opening, but it may be multiple openings. In the example of FIG. 2, the opening of the treatment liquid supply port 13b is oriented horizontally, but it may be oriented downward.

As shown in FIG. 3, the treatment liquid supply port 13b may be located at or near the lower end of the reaction heat recovery device 60a, i.e., near the bottom 22a in the absorption section 28. This allows both the treatment liquid with a high absorption rate of acidic compounds and the gas to be treated to be supplied from or near the lower end of the reaction heat recovery device 60a. This allows the treatment liquid to absorb acidic compounds at or near the lower end of the reaction heat recovery device 60a, and the reaction heat generated by this absorption can be recovered by the reaction heat recovery device 60a.

The multiple processing liquid supply ports 13b are not limited to the form shown in Figures 2 and 3 as long as they are arranged inside the main body 22. For example, one processing liquid supply port 13b may be arranged between the liquid level of the processing liquid and the upper end of the reaction heat recovery device 60a, and another processing liquid supply port 13b may be arranged at or near the lower end of the reaction heat recovery device 60a.

Third Embodiment
4 shows a third embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the absorption device 20 according to the first embodiment, the main body 22 accommodates the reaction heat recovery device 60a and is filled with the treatment liquid and corresponds to the absorption section 28 that opens upward. However, in the absorption device 20 according to the third embodiment, a separation wall 100 disposed in the main body 22 functions as the absorption section 28.

The widening portion 23 is connected to the main body portion 22 so that the upper end of the main body portion 22 and the lower end portion 23a of the widening portion 23 are continuous.

A separation wall 100 is disposed inside the main body 22 and the widening portion 23. The separation wall 100 is configured as a vertically long cylinder that opens upward and downward. The width of the separation wall 100 is smaller than the width of the side portion 22b of the main body 22, and the separation wall 100 is disposed apart from the inner surface of the side portion 22b of the main body 22 and the inner surface of the side portion 23b of the widening portion 23. A space S1 is provided between the outer surface of the separation wall 100 and the inner surface of the side portion 22b of the main body 22 and the inner surface of the side portion 23b of the widening portion 23. A space S2 is provided between the upper end of the separation wall 100 and the inner surface of the upper portion 23c of the widening portion 23. The separation wall 100 is disposed so that the upper end of the separation wall 100 is higher than the upper end of the main body 22 and the lower end 23a of the widening portion 23. The upper end of the separation wall 100 is configured as a weir that allows the treatment liquid inside the separation wall 100, i.e., inside the absorption section 28, to overflow. The lower end of the separation wall 100 is spaced apart from the inner surface of the bottom 22a of the main body 22. This space can be used to extend the treatment liquid supply path 13 to the lower end of the separation wall 100, and a treatment liquid supply port 13b can be inserted into the separation wall 100 from the lower end of the separation wall 100.

The reaction heat recovery device 60a is disposed inside the separation wall 100. That is, the separation wall 100 constitutes an absorption section 28 that is filled with the treatment liquid and opens upward while accommodating the reaction heat recovery device 60a. That is, the absorption vessel 21 has an absorption section 28. The reaction heat recovery device 60a is inserted almost entirely into the separation wall 100 (absorption section 28) in a manner that stands vertically in an inverted U shape from the inner surface of the bottom 22a of the main body 22.

Inside the area surrounded by the separation wall 100, the treatment liquid supply port 13b is located between the liquid level of the treatment liquid and the upper end of the reaction heat recovery device 60a.

In addition, a plurality of oblique baffles 110 are attached to the inner surface of the separation wall 100. The plurality of oblique baffles 110 constitute a meandering section that causes the flow of the fluid containing the gas to be treated and the treatment liquid in the main body 22 to meander in a spiral shape. In the example of FIG. 4, each oblique baffle 110 is made of a metal plate material having a plurality of holes. For example, each plate material is made of a plate-shaped SUS having holes. A bundle of tubes constituting the reaction heat recovery device 60a penetrates the holes of the oblique baffle 110. In this embodiment, the plate materials adjacent in the vertical direction are supported in an inclined state on the inner wall of the separation wall 100 so that the inclination directions are different from each other. The plurality of oblique baffles 110 may be attached to the separation wall 100 so as to contact the reaction heat recovery device 60a. In FIG. 4, the oblique baffle 110 shown by the solid line is located on the front side of the paper with respect to a plane passing through the center line of the absorption device 20 in a plan view, while the oblique baffle 110 shown by the dashed line is located on the back side of the paper with respect to the plane passing through the center line.

The second discharge section 15 is located higher in the vertical direction than the first discharge section 14 and is connected to a position communicating with the space S1. In this embodiment, the second discharge section 15 is connected to the side section 22b of the main body section 22 and the side section 23b of the widening section 23. It is sufficient that the second discharge section 15 is connected to at least one of the side section 22b of the main body section 22 and the side section 23b of the widening section 23.

In the separation wall 100 (absorption section 28), the reaction heat recovery device 60a and the multiple inclined baffles 110 are immersed in the treatment liquid, and the treatment liquid is supplied into the absorption section 28 through the treatment liquid supply port 13b. When the gas to be treated is supplied to the treatment liquid from the gas supply path 11 in this state, the gas to be treated rises in the treatment liquid while being dispersed by passing through the multiple holes of the multiple inclined baffles 110. In this embodiment, the gas supply path 11 supplies the gas to be treated into the absorption section 28 from two directions opposite to each other in a cross-sectional view. When the treatment liquid and the gas to be treated come into contact with each other, the treatment liquid absorbs the acidic compounds in the gas to be treated and the liquid phase separation occurs into a first phase part and a second phase part. The reaction heat generated by this absorption is recovered by the reaction heat recovery device 60a. The multiple inclined baffles 110 make the treatment liquid and the gas to be treated meander in a spiral shape, so that the residence time of the treatment liquid and the gas to be treated in the absorption section 28 can be secured and the heat transfer rate of the reaction heat to the reaction heat recovery device 60a is improved. This increases the contact area between the treatment liquid and the gas to be treated. Therefore, more acidic compounds in the gas to be treated are absorbed by the treatment liquid, and more reaction heat can be generated. When the multiple inclined baffles 110 are in contact with the reaction heat recovery device 60a, the heat recovered by the multiple inclined baffles 110 can be transferred to the reaction heat recovery device 60a. The second phase portion separated into liquid phases overflows from the upper opening of the absorption section 28, flows into the space S1, and accumulates in the space S1. The treatment liquid mainly containing the second phase portion is taken out from the second discharge section 15, and the treatment liquid mainly containing the first phase portion is taken out from the first discharge section 14.

In the third embodiment, the treatment liquid supply port 13b may be disposed at the position shown in Figures 2 and 3, or multiple treatment liquid supply ports 13b may be disposed at a position that combines the positions shown in Figures 1 to 3.

In the first and second embodiments, multiple inclined baffle plates 110 may be provided instead of multiple baffle plates 70. In the third embodiment, multiple inclined baffle plates 70 may be provided instead of multiple baffle plates 110.

The present invention is not limited to the above embodiment, and may be modified in the following ways:

(A) About the meandering part The baffle plates 70 are not limited to being attached to the inner wall surface of the main body 22 (the absorption section 28) as shown in the first and second embodiments, and may be attached to the reaction heat recovery device 60a. In the example of FIG. 5, the baffle plates 70 include a first baffle plate portion 70a attached to the reaction heat recovery device 60a and a second baffle plate portion 70b attached to the inner wall surface of the absorption section 28. The first baffle plate portion 70a is attached across one tube and the other tube of the inverted U-shape of the reaction heat recovery device 60a. The first baffle plate portion 70a is not attached to the inner wall surface of the absorption section 28. The second baffle plate portion 70b extends from one of the inner wall surfaces facing each other in the absorption section 28 until it overlaps the first baffle plate portion 70a in the vertical direction. As a result, a meandering flow path is formed in the absorption section 28.

(B) Regarding the heat transfer section The condenser 60f of the heat transfer section 60 may be disposed in the regenerator 30 as shown in FIG. 6, instead of being disposed in the heat exchanger 50. The liquid refrigerant among the refrigerants discharged from the reaction heat recovery device 60a to the outlet chamber 25 is heated by the reaction heat in the exothermic reaction and vaporized. The gaseous refrigerant is compressed by the compressor 60c and flows into the condenser 60f. The gaseous refrigerant flowing in the condenser 60f is condensed by the endothermic reaction in the regenerator 30. The condensed liquid refrigerant is pumped by the pump 60d, expanded by the expansion mechanism 60e, and flows into the reaction heat recovery device 60a through the inlet chamber 24. In this way, the reaction heat of the absorption device 20 is transported to the regenerator 30 by the circulation of the refrigerant. By using the heat transfer section 60, the regeneration energy required for regeneration can be reduced.

(C) Others In the above embodiment, the baffles 70, the liquid level meter 75, the treatment liquid amount control unit 76, the gas flow meter 77, and the refrigerant amount control unit 78 may be omitted as appropriate. In addition, as long as the refrigerant can be circulated to the reaction heat recovery device 60a, the inlet chamber 24 and the outlet chamber 25 may also be omitted.

Reference Signs List 10: Gas treatment device 11: Gas supply path 13: Treated liquid supply path 13b: Treated liquid supply port 14: First discharge section 15: Second discharge section 16: Connection section 20: Absorption device 21: Absorption vessel 22: Main body section 24: Inlet chamber 25: Outlet chamber 28: Absorption section 41: First flow path 42: Second flow path 60a: Reaction heat recovery device 70: Baffle plate 100: Separation wall 110: Inclined baffle plate

Claims (8)

An absorption apparatus for contacting a gas to be treated containing an acidic compound with a treatment liquid that undergoes phase separation due to absorption of the acidic compound, thereby causing the acidic compound to be absorbed into the treatment liquid ,
A container;
a processing liquid supply path for supplying the processing liquid into the container;
a reaction heat recovery device that is disposed inside the container so as to be immersed in the treatment liquid and that recovers reaction heat generated when the treatment liquid absorbs the acidic compound;
a gas supply passage for supplying the gas to be treated into the container at a position within the height range of the reaction heat recovery device;
the treatment liquid supply path includes a supply path main body portion extending downward within the container relative to a connection portion connected to the container, and a supply pipe provided at a tip end portion of the supply path main body portion and having a treatment liquid supply port opening within the container;
the treatment liquid supply port is positioned closer to the reaction heat recovery device than a connection portion where the treatment liquid supply path is connected to the container , and is positioned so as to be below the liquid level of the treatment liquid during operation . 2. The absorption device of claim 1 ,
The treatment liquid supply port is located between the liquid level and an upper end of the reaction heat recovery device. An absorption apparatus for contacting a gas to be treated containing an acidic compound with a treatment liquid that undergoes phase separation due to absorption of the acidic compound, thereby causing the acidic compound to be absorbed into the treatment liquid ,
A container;
a processing liquid supply path for supplying the processing liquid into the container;
a reaction heat recovery device that is disposed inside the container so as to be immersed in the treatment liquid and that recovers reaction heat generated when the treatment liquid absorbs the acidic compound;
a gas supply passage for supplying the gas to be treated into the container at a position within the height range of the reaction heat recovery device;
the treatment liquid supply path includes a supply path main body extending from a connection portion connected to the container within the container, and a supply pipe provided at a tip end of the supply path main body and having a treatment liquid supply port opening within the container;
the treatment liquid supply port is disposed within the height range of the reaction heat recovery device and is disposed so as to be located below the liquid level of the treatment liquid during operation . 4. The absorption device of claim 3 ,
The process liquid supply port is disposed at or near the lower end of the reaction heat recovery vessel. The absorption device according to any one of claims 1 to 4 ,
The absorption apparatus further comprises a serpentine section disposed inside the container so as to be immersed in the treatment liquid, the serpentine section causing the gas to rise in the treatment liquid while serpentine. An absorption apparatus for contacting a gas to be treated containing an acidic compound with a treatment liquid that undergoes phase separation due to absorption of the acidic compound, thereby causing the acidic compound to be absorbed into the treatment liquid ,
A container;
a processing liquid supply path having a processing liquid supply port that opens in the container and supplies the processing liquid into the container;
a reaction heat recovery device that is disposed inside the container so as to be immersed in the treatment liquid and that recovers reaction heat generated when the treatment liquid absorbs the acidic compound;
a gas supply passage for supplying the gas to be treated into the container at a position within the height range of the reaction heat recovery device;
the container has an absorption section which is filled with the treatment liquid in a state in which the reaction heat recovery device is housed therein and which is open upward, an expansion section which forms a space between the absorption section and the widening section into which the treatment liquid overflowing from an upper end opening of the absorption section flows, a first discharge section which is connected to the absorption section, and a second discharge section which is disposed at a position higher than the first discharge section in the up-down direction ,
In the absorption section of the container, the treatment liquid that has come into contact with the gas to be treated undergoes phase separation into a first phase portion having a high content of the acidic compounds and a second phase portion having a low content of the acidic compounds and a lower specific gravity than the first phase portion,
the second discharge section discharges the treatment liquid including the second phase portion that has overflowed from the absorption section, and the first discharge section discharges the treatment liquid other than the treatment liquid discharged through the second discharge section,
The treatment liquid supply port is disposed so as to be located below the liquid level of the treatment liquid in the absorption section during operation . The absorption device according to any one of claims 1 to 6 ,
The container further includes an inlet chamber connected to an outer surface of the bottom of the container, through which a coolant for recovering the reaction heat is introduced into the reaction heat recovery device, and an outlet chamber through which the coolant is discharged from the reaction heat recovery device;
the reaction heat recovery vessel has an inverted U-shaped tube standing vertically from the inner surface of the bottom, one end of the tube communicating with the inlet chamber and the other end of the tube communicating with the outlet chamber. An absorption device according to any one of claims 1 to 7 ;
a regeneration device for heating the treatment liquid that has come into contact with the gas to be treated to separate the acidic compounds;
a liquid delivery section that delivers the treatment liquid that has come into contact with the gas to be treated in the container to the regeneration device.