Carbon dioxide gas recovery device

Abstract

The present invention relates to a carbon dioxide gas recovery device which efficiently recovers high-concentration carbon dioxide gas from exhaust gas of a fuel cell system. This carbon dioxide gas recovery device is provided with: an inlet part into which exhaust gas from a fuel cell system is introduced; a heat exchange unit that cools the exhaust gas by heat exchange; a first moisture absorption unit that separates condensed water from the exhaust gas; a second moisture absorption unit that absorbs the humidity of the exhaust gas; a carbon dioxide gas recovery unit that recovers carbon dioxide gas from the exhaust gas; a first gas line that is connected to the outlet section from the inlet section through the heat exchange section, the first moisture absorption section, the second moisture absorption section, and the carbon dioxide gas recovery section in this order; and a pump provided in the first gas line.

Description

Technical Field

[0001] The present invention relates to a carbon dioxide gas recovery device. Background Art

[0002] Conventionally, as such a carbon dioxide gas recovery device, a device equipped with a foaming device that dissolves carbon dioxide gas contained in exhaust gas discharged from a fuel cell has been proposed (for example, refer to Patent Document 1). Exhaust gas containing high-temperature water vapor and carbon dioxide discharged from the fuel cell is guided to the foaming device to foam in water. Moreover, the water in the foaming tank becomes warm water by the heat of the high-temperature water vapor, and carbon dioxide in the exhaust gas is dissolved in the water by the foaming action to produce carbonated hot spring water. The carbonated hot spring water is supplied to a bathtub in the facility via a circulation pump and circulated to the foaming device.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-272693

[0004] However, since only about a few percent of the carbon dioxide contained in the exhaust gas of the fuel cell, even if the exhaust gas of the fuel cell is directly supplied to water, it is impossible to produce carbonated hot spring water with a sufficient concentration. Summary of the Invention

[0005] The main object of the carbon dioxide gas recovery device of the present invention is to provide a carbon dioxide gas recovery device that can efficiently recover high-concentration carbon dioxide gas from the exhaust gas of a fuel cell system.

[0006] The carbon dioxide gas recovery device of the present invention adopts the following mechanism in order to achieve the above main object.

[0007] The carbon dioxide gas recovery device of the present invention recovers carbon dioxide gas contained in the exhaust gas of a fuel cell system, and is characterized by comprising: an inlet portion that introduces the exhaust gas of the fuel cell system; a heat exchange portion that cools the exhaust gas by heat exchange; a first moisture absorption portion that separates condensed water from the exhaust gas; a second moisture absorption portion that absorbs moisture in the exhaust gas; a carbon dioxide gas recovery portion that recovers carbon dioxide gas from the exhaust gas; a first gas pipeline that is connected from the inlet portion to an outlet portion via the heat exchange portion, the first moisture absorption portion, the second moisture absorption portion, and the carbon dioxide gas recovery portion in sequence; and a pump that is provided in the first gas pipeline.

[0008] In the carbon dioxide gas recovery device of the present invention, the exhaust gas of the fuel cell system introduced into the inlet portion is cooled by the heat exchange portion, the condensed water generated by the cooling of the exhaust gas is separated in the first moisture absorption portion, and after absorbing moisture in the second moisture absorption portion, it is supplied to the carbon dioxide gas recovery portion. Thus, the carbon dioxide gas recovery device recovers carbon dioxide gas from the exhaust gas in a state where the temperature and humidity of the exhaust gas are reduced, so that high-concentration carbon dioxide gas can be recovered efficiently. In addition, the exhaust gas cooled by the heat exchanger and separated from the condensed water by the first moisture absorption portion is supplied to the second moisture absorption portion, so that the humidity of the exhaust gas can be reduced in the second moisture absorption portion with a smaller amount of moisture absorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic structural diagram of the carbon dioxide gas recovery device of the present embodiment.

[0010] Figure 2 is an explanatory diagram showing the flow of gas (exhaust gas) in the exhaust gas recovery mode.

[0011] Figure 3 is an explanatory diagram showing the flow of gas (carbon dioxide gas) in the carbon dioxide gas separation mode.

[0012] Figure 4 is an explanatory diagram showing the flow of gas (purge gas) in the moisture absorbent regeneration mode.

[0013] DESCRIPTION OF REFERENCE NUMERALS

[0014] 10... Carbon dioxide gas recovery device, 11... Inlet portion, 20... Heat exchange portion, 21... Container, 22... Exhaust gas flow path, 23... Moisture absorbent, 30... First moisture absorption portion, 40... Second moisture absorption portion, 50... Carbon dioxide gas recovery portion, 60... Pump, 100... Carbon dioxide gas utilization device, B1... Branch point, L1... First gas pipeline, L2... Second gas pipeline, L3... Third gas pipeline, L4... Fourth gas pipeline, V1... First on-off valve, V2... Second on-off valve, V3... Third on-off valve, V4... Fourth on-off valve, V5... Fifth on-off valve, V6... Sixth on-off valve. DETAILED DESCRIPTION OF THE INVENTION

[0015] Embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

[0016] Figure 1It is a schematic structural diagram of the carbon dioxide gas recovery device 10 of the present embodiment. The carbon dioxide gas recovery device 10 of the present embodiment is a device for recovering carbon dioxide gas (CO2) contained in the exhaust gas of the fuel cell system 1. The fuel cell system 1 includes, for example: a reformer that reforms a raw fuel gas such as natural gas or LP gas and generates a fuel gas containing hydrogen; a fuel cell stack that generates electricity through an electrochemical reaction based on the fuel gas and an oxidant gas (air) generated by the reformer; and a burner that burns the exhaust gas discharged from the fuel cell stack. The exhaust gas generated by the combustion of the exhaust gas by the burner contains water vapor and carbon dioxide gas. The carbon dioxide gas recovery device 10 of the present embodiment first recovers the carbon dioxide gas in the exhaust gas and supplies the recovered carbon dioxide gas to the carbon dioxide gas utilization device 100 at a required time. As the carbon dioxide gas utilization device 100, for example, a carbonated spring device that dissolves carbon dioxide gas in hot water and generates carbonic acid can be cited.

[0017] The carbon dioxide gas recovery device 10 of the present embodiment includes: an inlet portion 11 for introducing the exhaust gas of the fuel cell system 1, a heat exchange portion 20 for cooling the exhaust gas, a first moisture absorption portion 30 and a second moisture absorption portion 40 for absorbing the moisture in the exhaust gas, a carbon dioxide gas recovery portion 50 for recovering the carbon dioxide gas in the exhaust gas, a pump 60, first to fourth gas pipelines L1 to L4, first to sixth on-off valves V1 to V6, and a control device 70 for controlling the whole device. The heat exchange portion 20, the first moisture absorption portion 30, the second moisture absorption portion 40, the carbon dioxide gas recovery portion 50, and the pump 60 are arranged in the first gas pipeline L1 in this order from the inlet portion 11.

[0018] The heat exchange portion 20 is a component for cooling the exhaust gas. The heat exchange portion 20 includes: a container 21 having an internal space, an exhaust gas flow path 22 that forms a part of the first gas pipeline L1 and is provided to penetrate the internal space of the container 21, and a moisture absorbent 23 filled into the internal space of the container 21. The moisture absorbent 23 is a component having a humidity control function such as silica gel, and releases moisture with an endothermic reaction by being purged with dry air in a state of absorbing moisture. The heat exchange portion 20 cools the exhaust gas flowing in the exhaust gas flow path 22 by the endothermic action of the moisture absorbent 23. In the present embodiment, the terminal portion of the first gas pipeline L1 is connected to the container 21 of the heat exchange portion 20. After introducing the exhaust gas passing through the exhaust gas flow path 22, the first moisture absorption portion 30, the second moisture absorption portion 40, and the carbon dioxide gas recovery portion 50 of the heat exchange portion 20 as a purge gas into the internal space filled with the moisture absorbent 23 of the container 21, it is discharged to the external air.

[0019] The first moisture absorption part 30 is configured as a moisture collector that recovers and accumulates the condensed water generated by the cooling of the exhaust gas in the heat exchange part 20. One end of a drain pipe 31 is connected to the bottom of the first moisture absorption part 30, and a check valve 32 is provided at the other end of the drain pipe 31. The check valve 32 opens when the internal pressure (positive pressure) of the first moisture absorption part 30 exceeds the set pressure. When the check valve 32 opens, the first moisture absorption part 30 discharges the accumulated condensed water to the outside.

[0020] The second moisture absorption part 40 is a component that absorbs the moisture of the exhaust gas that has passed through the first moisture absorption part 30. The second moisture absorption part 40 includes a container 41 having an internal space formed therein, a moisture absorbent 42 filled into the internal space of the container 41, and a heater (not shown) for heating and regenerating the moisture absorbent 42. The moisture absorbent 42 of the second moisture absorption part 40 has a higher moisture absorption capacity than the moisture absorbent 23 of the heat exchange part 20 and releases the absorbed moisture by heating to be regenerated. As the moisture absorbent 42, for example, synthetic zeolite of type A is used.

[0021] The carbon dioxide gas recovery part 50 is a component that recovers carbon dioxide gas from the low-temperature / low-humidity exhaust gas that has passed through the heat exchange part 20, the first and second moisture absorption parts 30 and 40. The carbon dioxide gas recovery part 50 includes a container 51 having an internal space formed therein, a carbon dioxide gas absorbent 52 filled into the internal space of the container 51, and a heater (not shown) for heating and regenerating the carbon dioxide gas absorbent 52. The carbon dioxide gas absorbent 52 is an absorbent that selectively absorbs the carbon dioxide gas contained in the exhaust gas and releases the absorbed carbon dioxide gas by heating. As the carbon dioxide gas absorbent 52, for example, synthetic zeolite of type X is used. In addition, the container 51 is configured as a storage tank for storing the carbon dioxide gas absorbed by the carbon dioxide gas absorbent 52. Thus, compared with the case of separately providing a storage tank for storing the recovered carbon dioxide gas, the carbon dioxide gas recovery device 10 can be made into a simpler structure and miniaturized.

[0022] The pump 60 is a vacuum pump and is arranged on the downstream side of the carbon dioxide gas recovery part 50 in the first gas pipeline L1.

[0023] The second gas pipeline L2 is a pipeline for supplying the carbon dioxide gas recovered by the carbon dioxide gas recovery part 50 to the carbon dioxide gas utilization device 100. The second gas pipeline L2 branches at a branch point B1 on the downstream side of the pump 60 in the first gas pipeline L1 and is connected to the carbon dioxide gas utilization device 100.

[0024] The third gas pipeline L3 and the fourth gas pipeline L4 are pipelines for supplying purging air to the second moisture absorbing part 40. The third gas pipeline L3 branches at a branch point B2 between the carbon dioxide gas recovery part 50 and the pump 60 of the first gas pipeline L1 and is connected to the container 21 of the heat exchange part 20. The fourth gas pipeline L4 branches at a branch point B1 of the first gas pipeline L1 and is connected to the container 41 of the second moisture absorbing part 40.

[0025] The first on-off valve V1 is arranged on the downstream side of the second moisture absorbing part 40 and the upstream side of the carbon dioxide gas recovery part 50 of the first gas pipeline L1. The second on-off valve V2 is arranged on the downstream side of the carbon dioxide gas recovery part 50 of the first gas pipeline L1 and the upstream side of the pump 60 (upstream side of the branch point B2). The third on-off valve V3 is arranged on the downstream side of the pump 60 of the first gas pipeline L1 (downstream side of the branch point B1). The fourth on-off valve V4 is arranged on the second gas pipeline L2. The fifth on-off valve V5 is arranged on the third gas pipeline L3. The sixth on-off valve V6 is arranged on the fourth gas pipeline L4.

[0026] In addition, a flow meter 61 is arranged on the downstream side of the pump 60 and the upstream side of the branch point B1 of the first gas pipeline L1, and a pressure gauge 62 is arranged on the downstream side of the first on-off valve V1 and the upstream side of the carbon dioxide gas recovery part 50 of the first gas pipeline L1.

[0027] Although not shown, the control device 70 is configured as a microprocessor centered on a CPU. In addition to the CPU, it also has a ROM, a RAM, and input / output ports. Detection signals from the flow meter 61, the pressure gauge 62, etc. are input to the control device 70 via the input port. In addition, drive signals for the pump 60, drive signals for the first to sixth on-off valves V1 to V6, etc. are output from the control device 70 via the output port.

[0028] Next, the operation of the carbon dioxide gas recovery device 10 configured in this way will be described. As its operation mode, the carbon dioxide gas recovery device 10 has an exhaust gas recovery mode, a carbon dioxide gas detachment mode, and a desiccant regeneration mode.

[0029] The exhaust gas recovery mode is a mode for recovering carbon dioxide gas from the exhaust gas discharged from the fuel cell system 1. Figure 2This is an explanatory diagram showing the flow of gas (exhaust gas) in the exhaust gas recovery mode. In the exhaust gas recovery mode, the control device 70 opens the first on-off valve V1, the second on-off valve V2, and the third on-off valve V3, closes the fourth on-off valve V4, the fifth on-off valve V5, and the sixth on-off valve V6, and operates the pump 60. By the operation of the pump 60, the inlet portion 11 sucks the exhaust gas from the fuel cell system 1. The sucked exhaust gas flows in the first gas pipeline L1, and after passing through the heat exchange portion 20 (exhaust gas flow path 22), the first moisture absorption portion 30, and the second moisture absorption portion 40 in sequence, it is supplied to the carbon dioxide gas recovery portion 50. That is, the introduced exhaust gas is first cooled by the heat exchange portion 20. The water vapor in the exhaust gas condenses by the cooling of the exhaust gas, and the generated condensed water is recovered by the first moisture absorption portion 30. The exhaust gas that has passed through the heat exchange portion 20 and the first moisture absorption portion 30 passes through the moisture absorbent 42 of the second moisture absorption portion 40, and after the moisture is absorbed by the moisture absorbent 42, it is supplied to the carbon dioxide gas recovery portion 50. After reducing the temperature and humidity of the exhaust gas, the carbon dioxide gas in the exhaust gas is recovered by the carbon dioxide gas absorbent 52 of the carbon dioxide gas recovery portion 50, so that the carbon dioxide gas can be efficiently recovered with a smaller amount of the carbon dioxide gas absorbent 52. Then, the humidity of the remaining exhaust gas after passing through the carbon dioxide gas recovery portion 50 is reduced, and it passes through the moisture absorbent 23 of the heat exchange portion 20 as a purge gas and is released into the atmosphere. By passing the exhaust gas with reduced humidity through the moisture absorbent 23 in a state where the moisture absorbent 23 has absorbed moisture, the moisture absorbent 23 releases the absorbed moisture and regenerates along with an endothermic reaction. The heat exchange portion 20 cools the exhaust gas flowing in the exhaust gas flow path 22 by the endothermic action of the moisture absorbent 23. Thus, it is possible to reduce the temperature and humidity of the exhaust gas in the heat exchange portion 20 and the first moisture absorption portion 30 with a simple structure, and it is possible to reduce the amount of the moisture absorbent 42 required for the second moisture absorption portion 40 in the subsequent stage. In addition, since the exhaust gas with reduced humidity by the first moisture absorption portion 30 and the second moisture absorption portion 40 passes through the moisture absorbent 23 of the heat exchange portion 20 as a purge gas, a heater for regenerating the moisture absorbent 23 is not required, and the cost can be reduced.

[0030] In the exhaust gas recovery mode, when the operation time of the pump 60 reaches a specified time, the control device 70 determines that the recovery of carbon dioxide gas has ended and ends the exhaust gas recovery mode. In addition, since the carbon dioxide gas absorbent 52 of the present embodiment rises in temperature just before the absorption of carbon dioxide gas ends, a temperature sensor for detecting the temperature of the carbon dioxide gas absorbent 52 is provided in the container 51 of the carbon dioxide gas recovery portion 50, and the control device 70 can also determine whether the recovery of carbon dioxide gas has ended based on the detection value from this temperature sensor.

[0031] The carbon dioxide gas separation mode is a mode in which the carbon dioxide gas recovered by the carbon dioxide gas recovery unit 50 is separated and supplied to the carbon dioxide gas utilization device 100. Figure 3 It is an explanatory diagram showing the flow of the gas (carbon dioxide gas) in the carbon dioxide gas separation mode. In the carbon dioxide gas separation mode, the control device 70 first opens the second on-off valve V2 and the fifth on-off valve V5, closes the first on-off valve V1, the third on-off valve V3, the fourth on-off valve V4, and the sixth on-off valve V6, and operates the pump 60. By the operation of the pump 60, the exhaust gas with a low carbon dioxide gas concentration remaining in the container 51 of the carbon dioxide gas recovery unit 50 is purged, and the inside of the container 51 of the carbon dioxide gas recovery unit 50 is in a vacuum state. Next, the control device 70 stops the pump 60, closes all the first to sixth on-off valves V1 to V6, and operates the heater of the carbon dioxide gas recovery unit 50. By the operation of the heater, the high-concentration carbon dioxide gas stored in the carbon dioxide gas recovery unit 50 (carbon dioxide gas absorbent 52) is released, and the pressure inside the container 51 rises. Then, when the pressure detected by the pressure gauge 62 reaches the threshold value, the control device 70 opens the second on-off valve V2 and the fourth on-off valve V4 and operates the pump 60. As a result, the high-concentration carbon dioxide gas released from the carbon dioxide gas absorbent 52 passes through the third gas pipeline L3 and is supplied to the carbon dioxide gas utilization device 100 and effectively utilized. In the present embodiment, the carbon dioxide gas utilization device 100 is a carbonated spring device that can generate a carbonated spring dissolved with a high-concentration carbon dioxide gas. The target flow rate of the carbon dioxide gas is set according to the requirements of the carbon dioxide gas utilization device 100, and the pump 60 is controlled by feedback control so that the flow rate detected by the flow meter 61 becomes the target flow rate, thereby controlling the supply amount of the carbon dioxide gas. After purging the exhaust gas remaining in the container 51 of the carbon dioxide gas recovery unit 50, the carbon dioxide gas recovery device 10 releases the carbon dioxide gas absorbed by the carbon dioxide gas absorbent 52, so that high-concentration carbon dioxide gas can be supplied at the beginning of using the carbon dioxide gas.

[0032] In addition, in the carbon dioxide gas separation mode, the control device 70 opens the second on-off valve V2 and the fifth on-off valve V5 and operates the pump 60. After purging the exhaust gas with a low carbon dioxide gas concentration remaining in the carbon dioxide gas recovery unit 50, the heater of the carbon dioxide gas recovery unit 50 is operated in such a way that the carbon dioxide gas is supplied to the carbon dioxide gas utilization device 100, and the second on-off valve V2 and the fourth on-off valve V4 are opened and the pump 60 is operated. However, the control device 70 may operate the heater of the carbon dioxide gas recovery unit 50 and open the second on-off valve V2 and the fourth on-off valve V4 and operate the pump 60 without purging the exhaust gas remaining in the carbon dioxide gas recovery unit 50.

[0033] The desiccant regeneration mode is a mode for releasing the moisture absorbed by the desiccant 42 of the second moisture absorption section 40 to regenerate the desiccant 42. Figure 4 The figure is an explanatory diagram showing the flow of gas (purge gas) in the desiccant regeneration mode. In the desiccant regeneration mode, the control device 70 opens the fifth on-off valve V5 and the sixth on-off valve V6, closes the first on-off valve V1, the second on-off valve V2, the third on-off valve V3, and the fourth on-off valve V4, and operates the pump 60 and the heater of the second moisture absorption section 40. By the operation of the pump 60, the container 21 of the heat exchange section 20 sucks air from the atmosphere. After the sucked air passes through the desiccant 23 in the container 21 and absorbs the moisture contained in the air, it sequentially passes through the third gas pipeline L3, the pump 60, and the fourth gas pipeline L4 and is supplied as purge air into the container 41 of the second moisture absorption section 40. By the operation of the heater, moisture is released from the desiccant 42 in the container 41 of the second moisture absorption section 40, and the released moisture is purged by the air supplied into the container 41. As described above, since the air supplied into the container 41 of the second moisture absorption section 40 recovers moisture by the desiccant 23 of the heat exchange section 20, the desiccant 42 can be efficiently regenerated by dry air. In addition, since the moisture of the air sucked by the pump 60 is recovered, corrosion of the pump 60 caused by moisture can be prevented, and the durability of the pump 60 can be further improved. The moisture released from the second moisture absorption section 40 (desiccant 42) and the air that has passed through the second moisture absorption section 40 are introduced into the first moisture absorption section 30 (moisture collector). As described above, a drain pipe 31 is connected to the bottom of the first moisture absorption section 30, and a check valve 32 that opens by applying positive pressure to the first moisture absorption section 30 is provided in the drain pipe 31. Therefore, the moisture in the first moisture absorption section 30 is released into the atmosphere together with the introduced air.

[0034] Thus, in the carbon dioxide gas recovery device 10 of the present embodiment, by opening and closing the first to sixth on-off valves V1 to V6, it is possible to switch between the exhaust gas recovery mode, the carbon dioxide gas separation mode, and the desiccant regeneration mode, and each mode can be executed by a single pump 60. As a result, the device can be simplified and miniaturized.

[0035] In the above embodiment, although the carbon dioxide gas recovery device 10 includes a single pump 60 shared in the exhaust gas recovery mode, the carbon dioxide gas separation mode, and the desiccant regeneration mode, it may also include two or more pumps.

[0036] In the above embodiment, although the heat exchange section 20 cools the exhaust gas by the heat absorption action of the desiccant 23, it may also cool the exhaust gas by heat exchange with other heat exchange media such as cooling water.

[0037] As described above, although the embodiments have been used to illustrate the modes of implementing the present invention, the present invention is not limited to such embodiments in any way, and can of course be implemented in various forms without departing from the gist of the present invention.

[0038] [Industrial applicability]

[0039] The present invention can be used in the manufacturing industry of carbon dioxide gas recovery devices and the like.

Claims

1. A carbon dioxide gas recovery device that recovers carbon dioxide gas contained in the exhaust gas of a fuel cell system, characterized in that, comprises: an inlet section for introducing the exhaust gas of the fuel cell system; a heat exchange section for cooling the exhaust gas by heat exchange; a first moisture absorption section for separating condensed water from the exhaust gas; a second moisture absorption section for absorbing the moisture of the exhaust gas; a carbon dioxide gas recovery section for recovering carbon dioxide gas from the exhaust gas; a first gas pipeline connected to an outlet section from the inlet section through the heat exchange section, the first moisture absorption section, the second moisture absorption section, and the carbon dioxide gas recovery section in sequence; and a pump provided in the first gas pipeline.

2. The carbon dioxide gas recovery device according to claim 1, characterized in that comprises: a second gas pipeline; and a first on-off valve, a second on-off valve, a third on-off valve, and a fourth on-off valve, the pump is provided on the downstream side of the carbon dioxide gas recovery section of the first gas pipeline, the second gas pipeline branches from the downstream side of the pump of the first gas pipeline and is connected to a carbon dioxide gas utilization device using carbon dioxide gas, the first on-off valve is provided between the second moisture absorption section and the carbon dioxide gas recovery section of the first gas pipeline, the second on-off valve is provided between the carbon dioxide gas recovery section and the pump of the first gas pipeline, the third on-off valve is provided on the downstream side of the branch point of the first gas pipeline to the second gas pipeline, the fourth on-off valve is provided in the second gas pipeline, as an operation mode of the carbon dioxide gas recovery device, it has: a first mode in which the pump operates in a state where the first on-off valve, the second on-off valve, and the third on-off valve are opened; and a second mode in which the carbon dioxide gas recovered in the carbon dioxide gas recovery section is released, and the pump operates in a state where the second on-off valve and the fourth on-off valve are opened.

3. The carbon dioxide gas recovery device according to claim 2, characterized in that, comprises: a third gas pipeline and a fourth gas pipeline; and a fifth on-off valve and a sixth on-off valve, the second moisture absorption section has a moisture absorbent accommodated in an internal space, the third gas pipeline branches from between the second on-off valve and the pump of the first gas pipeline and introduces air for purging, the fourth gas pipeline branches from between the pump and the third on-off valve of the first gas pipeline and is connected to the second moisture absorption section, the first moisture absorption section accumulates condensed water and is open to the outside under positive pressure, as an operation mode of the carbon dioxide gas recovery device, it also has: a third mode in which the moisture absorbed in the second moisture absorption section is released, and the pump operates in a state where the fifth on-off valve and the sixth on-off valve are opened.

4. The carbon dioxide gas recovery device according to any one of claims 1 to 3, characterized in that the heat exchange section has: a container forming an internal space; an exhaust gas flow path provided to penetrate the internal space and allowing the exhaust gas from the inlet section to flow through; and a moisture absorbent accommodated in the internal space, absorbing the surrounding moisture and releasing the absorbed moisture along with an endothermic reaction, the first gas pipeline is formed to allow the exhaust gas passing through the carbon dioxide gas recovery section to pass through the moisture absorbent of the heat exchange section.

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