Absorption apparatus, gas treatment apparatus, absorption method, and gas treatment method

Abstract

To increase a recovery amount of reaction heat when absorbing an acidic compound using treatment liquid.SOLUTION: There is provided an absorber 20 which is configured so that, a treated gas including an acidic compound, is brought into contact with treatment liquid in which phase separation occurs by absorption of the acidic compound, for causing the treatment liquid to absorb the acidic compound. The absorber comprises: an absorption container 21; a treatment liquid supply path 13 having a treatment liquid supply hole 13a opened in the absorption container 21, and supplying the treatment liquid into the absorption container 21; a reaction heat recovery tool 60a arranged to be immersed in the treatment liquid in the absorption container 21 and recovering reaction heat generated by absorption of the acidic compound by the treatment liquid; and a gas supply path 11 supplying the treated gas into the absorption container 21, from a position in a height range of the reaction heat recovery tool 60a, wherein the treatment liquid supply hole 13a is arranged at a position below a liquid level of the treatment liquid during operation.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an absorption apparatus, a gas treatment apparatus including the absorption apparatus, an absorption method, and a gas treatment method in which the absorption method is carried out. [Background technology]

[0002] Conventionally, there has been known a gas treatment device that separates acidic compounds contained in a gas to be treated by contacting the acidic compounds with a treatment liquid, as disclosed in, for example, the following Patent Document 1. Patent Document 1 uses 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.

[0003] 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 a first phase portion having a high carbon dioxide content (CO 2 rich phase) and CO 2 The second phase (CO 2 The liquid phase is separated into a liquid phase (a lean phase) and a liquid phase (a lean phase). The liquid phase separated is sent to the regenerator via a heat exchanger. The heat exchanger is arranged 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 it. The carbon dioxide separated from the treatment liquid is recovered through a recovery path, while the treatment liquid from which carbon dioxide has been released is returned to the absorber via the heat exchanger. The heat pump has a closed-loop circulation path, an evaporator and a compressor arranged in the absorber, a condenser arranged in the regenerator, and an expander. The refrigerant circulates along the circulation path in the evaporator, the compressor, the condenser, and the expander, and the reaction heat 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-187553 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the gas treatment device disclosed in the above Patent Document 1, the 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, 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 reaction heat generated when the acidic compounds are absorbed may not be recovered.

[0006] Therefore, the present invention has been made in consideration of the above-mentioned conventional techniques, and an object of the present invention 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. [Means for solving the problem]

[0007] In order to achieve the above object, an absorption apparatus according to the present invention is an absorption apparatus that brings a gas to be treated, which contains acidic compounds, into contact with a treatment liquid that undergoes phase separation due to absorption of the acidic compounds, thereby absorbing the acidic compounds into the treatment liquid, the absorption apparatus comprising: a container; ,before 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 configured to recover reaction heat generated when the treatment liquid absorbs the acidic compound; and a reaction heat recovery device disposed within a height range of the reaction heat recovery device. In a gas supply passage for supplying the gas to be treated into the container; 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 disposed so as to be located below the liquid level of the treatment liquid during operation. and is disposed so as to be located below the liquid level of the treatment liquid during operation. is.

[0008] 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.

[0009] 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.

[0010] Moreover, The processing liquid supply port but The treating liquid supply passage is disposed at a position closer to the reaction heat recovery vessel than a connection portion connected to the vessel. To Even if the connection part where the treatment liquid supply passage is connected to the container is distant from the reaction heat recovery device, the treatment liquid supply port can be located closer to the reaction heat recovery device than the connection part, thereby increasing the amount of reaction heat recovered by the reaction heat recovery device.

[0011] 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 a larger amount 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.

[0012] The absorption apparatus according to the present invention is an absorption apparatus that brings a gas to be treated, which contains 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 when the treatment liquid absorbs the acidic compounds, and a gas supply path that supplies the gas to be treated into the container at a position within a 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 a tip of the supply path main body and has a treatment liquid supply port that opens inside the container, The treatment liquid supply port is disposed within the height range of the reaction heat recovery vessel. and is disposed so as to be located below the level of the treatment liquid during operation. attitude R . 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. Also By disposing 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.

[0013] 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, so that the treatment liquid can absorb the acidic compound near the reaction heat recovery vessel and the reaction heat generated by this absorption can be recovered.

[0014] The absorption device may further include a serpentine section disposed inside the container so as to be immersed in the treatment liquid, and which causes the gas to be treated to rise in the treatment liquid while serpentine. In this embodiment, the serpentine section causes the gas to be treated to rise in the treatment liquid while serpentine, thereby making it possible to lengthen the residence time of the gas to be treated in the treatment liquid compared to the case where 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. Thus, more acidic compounds in the gas to be treated are absorbed by the treatment liquid, generating more reaction heat.

[0015] The absorption device may further include a dispersion section disposed inside the container so as to be immersed in the treatment liquid, and dispersing the gas to be treated by passing the gas through the dispersion section. In this embodiment, the surface area of ​​the gas to be treated can be increased by dispersing the gas to be treated by the dispersion section. This increases the contact area between the treatment liquid and the gas to be treated, and more acidic compounds in the gas to be treated are absorbed by the treatment liquid, thereby generating more reaction heat.

[0016] The absorption apparatus according to the present invention is an absorption apparatus that brings a gas to be treated, which contains 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. The absorption apparatus 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. The container has an absorption section that is filled with the treatment liquid when the reaction heat recovery device is housed therein and opens upward, a widening section that forms a space between the absorption section and the treatment liquid to flow in the treatment liquid that overflows from the upper end opening of the absorption section, a first discharge section connected to the absorption section, and a second discharge section that is arranged at a position higher than the first discharge section in the vertical direction, The container The absorbing portion the treatment liquid that has come into contact with the gas to be treated is separated into a first phase portion having a high content of the acidic compound and a second phase portion having a low content of the acidic compound 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, 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 positioned 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, The first and second phases separated in the treated liquid that has come into contact with the gas to be treated are taken out of the container through the first and second discharge parts, respectively, so that the ratio between the first and second phases in the taken out treated liquid can be stabilized. That is, in the container, the treated 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 lower specific gravity than the first phase, the second phase is located at a higher position in the container than the first phase. Then, the treated liquid mainly containing the first phase is taken out of the container through the first discharge part, and the treated liquid mainly containing the second phase is taken out of the container through the second discharge part. Thus, the ratio between the first phase and the second phase can be stabilized in the treated liquid containing the first and second phases taken out of the container.

[0017] AlsoBy 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.

[0018] 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 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, and the reaction heat recovery device may have 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. In this embodiment, since the reaction heat recovery device stands upright on the inner surface of the bottom of the container in an inverted U-shape, 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 upright, the reaction heat generated by the 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.

[0019] The gas treatment device of the present invention comprises 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.

[0020] According to the present invention, it is 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. Effect of the Invention

[0026] As described above, according to the present invention, it is possible to increase the amount of reaction heat recovered when absorbing acidic compounds by 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. [Brief description of the drawings]

[0027] [Figure 1]1 is a diagram illustrating an overall configuration of a gas treatment device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating an overall configuration of a gas treatment device according to a second embodiment of the present invention. [Diagram 3] FIG. 11 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. [Figure 4] FIG. 13 is a diagram illustrating an overall configuration of a gas treatment device according to a third embodiment of the present invention. [Diagram 5] FIG. 4 is a schematic diagram showing the configuration of an absorption device according to another embodiment of the present invention. [Figure 6] FIG. 2 is a diagram illustrating an overall configuration of a gas treatment device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0029] (First embodiment) The gas treatment device 10 according to the first embodiment is a gas treatment device that separates the 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.

[0030] As shown in FIG. 1, the gas treatment device 10 includes an absorber 20, a regenerator 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 for introducing the treated liquid extracted from the absorber 20 into the regenerator 30, and a second flow path 42 for extracting the treated liquid from the regenerator 30 and returning it to the absorber 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 heat of the refrigerant in the outlet chamber 25 is the regenerator 30), the heat exchanger 50 can be omitted.

[0031] The absorber 20 brings the gas to be treated into contact with a 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 absorber 20 includes an absorption vessel (vessel) 21, an inlet chamber 24, and an outlet chamber 25.

[0032] The absorption container 21 includes a main body portion 22 and an expanded width portion 23 that is connected to the main body portion 22 so as to cover the main body portion 22 from above and is wider than the main body portion 22.

[0033] The main body 22 is configured as a bottomed cylindrical shape having a height in the vertical direction, with a bottom 22a, a side portion 22b extending upward from the periphery of the bottom portion 22a, and an upper end opening 22c that opens upward at the upper end of the side portion 22b.

[0034] 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 in the circumferential direction 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. Furthermore, a space S2 is provided between the upper end opening 22c and the inner surface of the upper portion 23c of the widened portion 23.

[0035] 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 led out 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.

[0036] 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 accommodated 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 disposed so as to be spaced apart from the inner surface of the side portion 22b of the main body 22.

[0037] 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 liquid to be treated 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.

[0038] The baffle plates 70 are arranged around the reaction heat recovery device 60a so as not to interfere with the reaction heat recovery device 60a. board The first inner surface of the reaction heat recovery device 60a is configured to surround approximately half of the reaction heat recovery device 60a. boardThe baffle plate 70 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 baffle plate 70 may also be disposed inside the reaction heat recovery vessel 60a.

[0039] A gas supply line 11 for supplying a gas to be treated such as a process gas and a first exhaust unit 14 for exhausting a part of the treatment liquid from the main body 22 are connected to 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 a side portion 22b near the bottom 22a. The first exhaust unit 14 is connected to the side portion 22b near the bottom 22a.

[0040] The widening section 23 is connected to a gas exhaust passage 12 for exhausting the gas after the treatment, a second exhaust section 15 for exhausting a part of the treatment liquid from the widening section 23, and a second flow path 42. The gas exhaust passage 12 is connected to an upper portion 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 communicating with the space S1. The second flow path 42 is connected to a side portion 23b of the widening section 23. Note that the phrase "connected" of the piping such as the gas exhaust passage 12, the second exhaust section 15, and the second flow path 42 to an object such as the widening section 23 includes, for example, a case where the piping penetrates the object, thereby connecting the space in the piping to the space in the object.

[0041] A treatment liquid supply path 13 that supplies the treatment liquid to the main body 22 is provided within the widening portion 23. The treatment liquid supply path 13 has a supply path main body 13a and a supply pipe provided at the tip of the supply path main body 13a. The supply path main body 13a is connected to the second flow path 42. In this embodiment, the supply path main body 13a is connected to the second flow path 42 at a side portion 23b of the widening portion 23. A connection portion (through portion) 16 between the supply path main body 13a and the widening portion 23 is provided at a position higher than the height position of the upper end opening 22c.

[0042] Supply path main body 13a is configured to extend from connection portion 16 into main body 22. Specifically, supply path main body 13a extends from connection portion 16 to above upper end opening 22c, and also extends downward from above upper end opening 22c toward the inside of main body 22.

[0043] The supply pipe is provided with a treatment liquid supply port 13b. The treatment liquid supply port 13b may be one 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 range in which the treatment liquid supply port 13b is formed in the supply pipe overlaps with the reaction heat recovery device 60a.

[0044] The main body 22 corresponds to the absorption section 28 which is filled with the treated liquid while accommodating the reaction heat recovery unit 60a and is open upward.

[0045] The absorbing device 20 is provided with a level gauge 75 for measuring the level of the treatment liquid in the space S1. In this embodiment, the level gauge 75 is connected to the side portion 23b of the widening portion 23 so as to communicate with the space S1. A treatment liquid amount control unit 76 is electrically connected to the level gauge 75. The treatment liquid amount control unit 76 controls the amount of treatment liquid supplied from the treatment liquid supply port 13b to the main body portion 22. In this embodiment, the treatment liquid amount control unit 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 portion 22 and the amount of treatment liquid discharged from the absorption vessel 21 through the first discharge portion 14 and the second discharge portion 15 is approximately the same, and the liquid level falls within a predetermined range.

[0046] A gas flowmeter 77 is attached to the gas supply passage 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 flowmeter 77. The refrigerant amount control unit 78 compares the flow rate of the gas to be treated measured by the gas flowmeter 77 with a predetermined gas amount threshold, and controls the rotation speed of the compressor 60c and the pump 60d of the heat transfer unit 60, which will be 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 the 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 the pump 60d to decrease the amount of liquid refrigerant supplied from the inlet chamber 24 to the reaction heat recovery unit 60a. In this way, the amount of refrigerant is adjusted according to the amount of gas to be treated supplied to the main body 22. If a sufficient pressure is ensured in the compressor 60c, the pump 60d is not necessary.

[0047] A first flow path 41 and a second flow path 42 are connected to the regeneration device 30. The first flow path 41 is connected to the upper part of the regeneration device 30, and allows the treated liquid discharged from the pump 55 to be introduced 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 allows the treated liquid stored in the regeneration device 30 to be discharged.

[0048] 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 are the acidic compounds desorbed, but water in the treatment liquid also evaporates.

[0049] A supply line 80 and a heating flow path 82 are connected to the regeneration device 30. The supply line 80 supplies the acidic compounds obtained in the regeneration device 30 to a destination. The supply line 80 is provided with a condenser 84 for cooling 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 is condensed, and the water vapor can be separated. The separated water vapor is returned to the regeneration device 30. As the condenser 84, a heat exchanger using inexpensive cooling water such as river water can be used.

[0050] 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 regenerator 30. The other end of the heating flow path 82 is connected to the lower part of the regenerator 30. The heating flow path 82 is provided with a reboiler 86 for heating the treatment liquid stored in the regenerator 30. The reboiler 86 may be arranged so as to heat the treatment liquid inside the regenerator 30, but may also be configured to heat the treatment liquid extracted from the regenerator 30 to the outside as shown in the figure. In this case, the reboiler 86 can be arranged in the heating flow path 82 that returns the treatment liquid to the regenerator 30 after heating. As the reboiler 86, for example, one that directly or indirectly heats the treatment liquid by any heat source such as electricity, steam, or a burner can be used.

[0051] The heat transfer section 60 transfers the refrigerant in the outlet chamber 25 to the heat exchanger 50. The heat transfer section 60 is provided with a closed-loop circulation flow path 60b in which a refrigerant is sealed. In the circulation flow path 60b, the inlet chamber 24, the reaction heat recovery device 60a, the outlet chamber 25, a compressor 60c, the heat exchanger 50, a pump 60d, and an expansion mechanism 60e are arranged in this order. A condenser 60f is arranged in the heat exchanger 50. The pump 60d can be omitted.

[0052] 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 may be a microchannel heat exchanger capable of exchanging heat between fluids with a relatively small temperature difference. This can improve energy efficiency.

[0053] The acidic compound separated by the gas treatment device 10 is not particularly limited as long as it makes the aqueous solution acidic. Examples of the acidic compound include hydrogen chloride, carbon dioxide, sulfur dioxide, and carbon disulfide.

[0054] 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. The amine compound is preferably 30 wt%, the organic solvent is 60 wt%, and the water is 10 wt%.

[0055] As an amine compound, for example, 2-aminoethanol (MEA: solubility parameter = 14.3 (cal / cm 3 ) 1 / 2 ), 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.

[0056] As an organic solvent, for example, 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), etc., and a mixture of two or more kinds may be used.

[0057] Next, a gas treatment method using the above-mentioned gas treatment device 10 will be described. The gas treatment method includes an absorption method in which 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 acidic compounds are released from the treatment liquid by heating in a regeneration device 30.

[0058] In the absorption method, the treatment liquid is supplied to the absorbing device 20 from the second flow path 42 in a state where the reaction heat recovery device 60a and the multiple baffle plates 70 are immersed in the treatment liquid in the main body 22 (absorbing section 28). That is, the treatment liquid introduced from the second flow path 42 is supplied into the absorbing 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 absorbing section 28. The treatment liquid in the absorbing section 28 overflows from the upper end opening 22c of the absorbing section 28 and flows into the space S1 of the widening section 23. That is, the side portion 22b of the absorbing section 28 (main body 22) located inside the widening section 23 plays the role of a weir that stores the treatment liquid in the absorbing section 28 until the treatment liquid overflows from the upper end opening 22c into the space S1.

[0059] 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 the vicinity of 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.

[0060] 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 the vicinity of 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 immediately in the treatment liquid. Therefore, more acidic compounds in the gas to be treated are absorbed into the treatment liquid.

[0061] 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, among the refrigerants introduced from the inlet chamber 24 to the reaction heat recovery device 60a, the liquid refrigerant is vaporized by the reaction heat and becomes a gaseous refrigerant, and thus 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 residence time of the gas to be treated in the treatment liquid is increased by the multiple baffle plates 70, so that the reaction heat recovery device 60a can recover more reaction heat.

[0062] In addition, in this embodiment, the area where the treatment liquid supply port 13b is formed in the supply piping overlaps with the reaction heat recovery device 60a in top view, so that 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 and the gas to be treated are brought into contact with each other in the vicinity of the reaction heat recovery device 60a, and the reaction heat can be recovered by the reaction heat recovery device 60a.

[0063] The treated 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 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 absorbing section 28, overflows from the upper end opening 22c of the absorbing section 28, flows into the space S1 in the widening section 23, and accumulates in the space S1. The treated liquid mainly containing the second phase portion is taken out 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 absorbing section 28, and the treated liquid mainly containing the first phase portion is taken out from the absorbing section 28 through the first discharge section 14. In this manner, by allowing the second phase portion, which has a smaller specific gravity than the first phase portion, to overflow from the absorbing section 28 and be introduced into the space S1 of the widening section 23, the treatment liquid mainly containing the second phase portion can be removed from the absorbing section 28 through the second discharge section 15, and the treatment liquid mainly containing the first phase portion can be removed from the absorbing section 28 through the first discharge section 14. Thus, 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 absorbing section 28.

[0064] Next, the treated liquid separated into liquid phases in the absorption device 20 is sent to the regeneration device 30. Specifically, the treated liquid mainly containing the first phase portion extracted from the absorption section 28 through the first discharge section 14 and the treated liquid mainly containing the second phase portion extracted from the absorption section 28 through the second discharge section 15 are joined together and sent to the regeneration device 30 through the first flow path 41 by the pump 55. That is, 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.

[0065] 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. 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. By circulating the refrigerant in this way, the treatment liquid sent to the regeneration device 30 is heated by 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.

[0066] 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 part and the second phase part are mixed is heated while flowing down. As a result, the acidic compounds are separated 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 that the temperature of the treatment liquid is reduced.

[0067] In addition, by introducing the entire treatment liquid including the first phase portion and the second phase portion into the regenerator 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 the 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.

[0068] 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. This makes it possible to prevent the gas to be treated from passing through the absorption vessel 21 without coming into contact with the treatment liquid. As a result, the treatment liquid and the acidic compounds in the gas to be treated react sufficiently to increase the reaction heat, and the amount of reaction heat recovered by the reaction heat recovery device 60a can be increased. Note that, 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, even if the liquid level fluctuates, Reaction heat recovery unit 60a It is possible to prevent the surface of the conductive material from being exposed to the treatment liquid. Reaction heat recovery unit 60a Since the material can be kept immersed in water, Reaction heat recovery unit 60a Therefore, it is possible to suppress a decrease in the amount of reaction heat recovered due to the above.

[0069] 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 having a high absorption rate of the acidic compounds in the gas to be treated is supplied to the absorption vessel 21 from the treatment liquid supply port 13b. Therefore, a large amount of reaction heat is generated by the treatment liquid absorbing a large amount of the 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 in a larger amount near the treatment liquid supply port 13b can be efficiently transferred to the reaction heat recovery device 60a, and a larger amount of 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.

[0070] In addition, in this embodiment, since the treatment liquid supply path 13 extends from the connection part 16 with the widened part 23 into the absorption part 28, even if the connection part 16 is away from the reaction heat recovery device 60a, the treatment liquid supply port 13b can be made closer to the reaction heat recovery device 60a than the connection part 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.

[0071] Furthermore, since 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.

[0072] In addition, since the absorption device 20 is configured in a vertically elongated tower shape, the time during which the gas to be treated is in contact with the treatment liquid can be extended, making it possible to generate and recover more reaction heat.

[0073] 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 absorbing device 20 according to the second embodiment differs from the absorbing device 20 according to the first embodiment in the position of the treatment liquid supply port 13b.

[0074] The treatment liquid supply port 13b may be disposed below the liquid level of the treatment liquid in the main body 22 (absorption section 28), and in the absorption apparatus 20 according to the second embodiment, the treatment liquid supply port 13b is disposed within the height range of the reaction heat recovery device 60a. That is, the treatment liquid supply port 13b is disposed between the upper end and the lower end of the reaction heat recovery device 60a. By placing 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.

[0075] In this embodiment, the second flow path 42 is connected to a portion (connection portion 16) in the body portion 22 within the height range of the reaction heat recovery device 60a so that the treatment liquid supply port 13b is located within the height range of the reaction heat recovery device 60a. The supply path body portion 13a is connected to the second flow path 42 at the connection portion 16 and extends from the connection portion 16 into the body portion 22. The treatment liquid supply port 13b opens at the tip of the supply path body portion 13a and is located within the height range of the reaction heat recovery device 60a. The supply path body portion 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 body portion 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, the present invention is not limited to this, 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.

[0076] 3, the treatment liquid supply port 13b may be disposed 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 having 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.

[0077] 2 and 3, as long as the multiple processing liquid supply ports 13b 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 the other processing liquid supply port 13b may be arranged at or near the lower end of the reaction heat recovery device 60a.

[0078] 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 corresponds to the absorption section 28 that is filled with the treatment liquid and opens upward, but the absorption device 20 according to the third embodiment is different in that a separation wall 100 disposed in the main body 22 functions as the absorption section 28.

[0079] The widened portion 23 is connected to the main body portion 22 such that the upper end of the main body portion 22 and the lower end portion 23a of the widened portion 23 are continuous with each other.

[0080] A separation wall 100 is disposed inside the main body 22 and the widening portion 23. The separation wall 100 is configured in a vertically long cylindrical shape 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 portion 23a of the widening portion 23. The upper end of the separation wall 100 is configured as a weir that allows the treatment liquid to overflow inside the separation wall 100, i.e., inside the absorption section 28. The lower end of the separation wall 100 is separated from the inner surface of the bottom 22a of the main body 22. This separated space can be utilized 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.

[0081] 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 while accommodating the reaction heat recovery device 60a and is open upward. That is, the absorption vessel 21 has the 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 the reaction heat recovery device 60a stands vertically in an inverted U-shape from the inner surface of the bottom 22a of the main body 22.

[0082] Moreover, within the space surrounded by the separation wall 100, the treatment liquid supply port 13b is disposed between the liquid level of the treatment liquid and the upper end of the reaction heat recovery device 60a.

[0083] 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 portion that causes the flow of the fluid containing the gas to be treated and the liquid to be treated 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 on the inner wall of the separation wall 100 in an inclined state so that the inclination directions of the plates 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 near 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 broken line is located on the far side of the paper with respect to the plane passing through the center line.

[0084] The second discharge portion 15 is located higher in the up-down direction than the first discharge portion 14, and is connected to a position communicating with the space S1. In this embodiment, the second discharge portion 15 is connected to the side portion 22b of the main body portion 22 and the side portion 23b of the widening portion 23. It is sufficient that the second discharge portion 15 is connected to at least one of the side portion 22b of the main body portion 22 and the side portion 23b of the widening portion 23.

[0085] In the separation wall 100 (absorption section 28), the reaction heat recovery device 60a and the multiple oblique 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 oblique 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 comes into contact with the gas to be treated, the treatment liquid absorbs acidic compounds in the gas to be treated and separates into a first phase portion and a second phase portion. The reaction heat generated by this absorption is recovered by the reaction heat recovery device 60a. The multiple oblique baffles Board 1 10 is process In order to make the liquid and the gas to be treated meander in a spiral manner, process The residence time of the liquid and the gas to be treated can be secured, and the rate of heat transfer of the reaction heat to the reaction heat recovery device 60a is improved. This increases the contact area between the liquid to be treated and the gas to be treated. Therefore, a large amount of acidic compounds in the gas to be treated is absorbed by the liquid to be treated, and a large amount of reaction heat can be generated. When 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 phase overflows from the opening above the absorption section 28, flows into the space S1, and accumulates in the space S1. The liquid to be treated that mainly contains the second phase portion is taken out from the second discharge section 15, and the liquid to be treated that mainly contains the first phase portion is taken out from the first discharge section 14.

[0086] In the third embodiment, the processing liquid supply port 13b may be disposed at a position shown in FIGS. 2 and 3, or a plurality of processing liquid supply ports 13b may be provided at a position that is a combination of the positions shown in FIGS. 1 to 3.

[0087] In the first and second embodiments, a plurality of inclined baffles 110 may be provided in place of the plurality of baffles 70. In the third embodiment, a plurality of inclined baffles 70 may be provided in place of the plurality of inclined baffles 110.

[0088] The present invention is not limited to the above-described embodiment, and may adopt the following aspects, for example.

[0089] (A) About the meandering section 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 portion 70a attached to the reaction heat recovery device 60a and a second baffle portion 70b attached to the inner wall surface of the absorption section 28. The first baffle 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 portion 70a is not attached to the inner wall surface of the absorption section 28. The second baffle portion 70b extends from one of the inner wall surfaces facing each other in the absorption section 28 until it overlaps the first baffle portion 70a in the vertical direction. As a result, a meandering flow path is formed in the absorption section 28.

[0090] (B) Heat transfer section The condenser 60f of the heat transfer unit 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 unit 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 unit 60a through the inlet chamber 24. In this way, the reaction heat of the absorption unit 20 is transported to the regenerator 30 by the circulation of the refrigerant. By using the heat transfer unit 60, the regeneration energy required for regeneration can be reduced.

[0091] (C) Other In the above embodiment, the baffle plates 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. Also, 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. [Explanation of symbols]

[0092] 10: Gas treatment equipment 11: Gas supply line 13: Processing liquid supply channel 13b: Processing liquid supply port 14: 1st discharge section 15:Second discharge section 16: Connection part 20: Absorber 21: Absorption container 22: Main body 24:Entrance room 25:Exit chamber 28: Absorption section 41: First flow path 42: Second flow path 60a: Reaction heat recovery device 70: Baffle plate 100: Separation wall 110: Oblique baffle plate

Claims

1. An absorption apparatus for contacting a gas to be treated containing an acidic compound with a treatment liquid which 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. 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.

3. An absorption apparatus for contacting a gas to be treated containing an acidic compound with a treatment liquid which 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. 4. The absorption device according to claim 3, The process liquid supply port is disposed at or near the lower end of the reaction heat recovery device.

5. An 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.

6. An absorption apparatus for contacting a gas to be treated containing an acidic compound with a treatment liquid which 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.

7. An 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.

8. 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.

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