Dehumidifier and carbon dioxide recovery system

Abstract

To provide a dehumidifier that can reduce energy consumption in a carbon dioxide capture system that directly captures carbon dioxide from the atmosphere, and a carbon dioxide capture system equipped with a dehumidifier. [Solution] The dehumidifier 3 comprises a compressor 311 that compresses a heat transfer medium, a condenser 312 that releases the heat from the heat transfer medium compressed by the compressor 311 to the outside, an expansion valve 313 that reduces the pressure of the heat transfer medium supplied from the condenser 312, an evaporator 314 that evaporates the heat transfer medium supplied from the expansion valve 313 and absorbs heat from the outside, and a blower 315 that takes in air and sends the pre-treated gas, which has been cooled by passing through the evaporator 314 and from which moisture has been removed, toward the carbon dioxide recovery device of the carbon dioxide recovery system.

Description

Technical Field

[0001] The present invention relates to a dehumidifying device used in a carbon dioxide recovery system for directly recovering carbon dioxide from the atmosphere, and a carbon dioxide recovery system equipped with the dehumidifying device.

Background Art

[0002] Patent Document 1 discloses a carbon dioxide recovery device that recovers carbon dioxide from exhaust gas emitted from an exhaust gas source. Examples of the exhaust gas sources described in Patent Document 1 include, for example, incinerators, coal-fired boilers, LNG-fired boilers, blast furnaces and converters in steel mills, kilns in cement factories, gas turbines, and the like. Further, examples of the gases contained in the exhaust gas from the exhaust gas source include nitrogen, oxygen, carbon dioxide, water, and acidic gases.

[0003] In the carbon dioxide recovery device described in Patent Document 1, zeolite is used as a carbon dioxide adsorbent capable of adsorbing carbon dioxide. Zeolite adsorbs moisture and carbon dioxide. Therefore, when exhaust gas containing moisture and carbon dioxide is passed through zeolite, zeolite adsorbs the moisture and carbon dioxide in the exhaust gas. As a result, it is known that the adsorption efficiency of carbon dioxide decreases.

[0004] Therefore, the carbon dioxide recovery device described in Patent Document 1 includes a pretreatment device and a carbon dioxide recovery device. The pretreatment device has a moisture adsorbent capable of adsorbing moisture and an acidic gas adsorbent capable of adsorbing acidic gases, and removes moisture and acidic gases from the exhaust gas. The carbon dioxide recovery device has a carbon dioxide adsorbent capable of adsorbing carbon dioxide, and adsorbs the carbon dioxide contained in the pretreated gas that has passed through the moisture adsorbent and the acidic gas adsorbent.

[0005] Here, in order to reduce carbon dioxide emissions from the perspective of global environmental protection, a technology for directly capturing carbon dioxide from the atmosphere (Direct Air Capture: DAC) is being considered. The concentration of carbon dioxide in the atmosphere is lower than the concentration of carbon dioxide in exhaust gas as described in Patent Document 1. Therefore, there is room for improvement in the carbon dioxide capture device described in Patent Document 1 in terms of efficiently removing moisture from the atmosphere and efficiently capturing carbon dioxide directly from the atmosphere.

[0006] In response to this, one option is to use a dehumidifier, such as a desiccant dehumidifier, as a device to remove moisture from the atmosphere (i.e., a pretreatment device). However, dehumidifiers that set the dew point temperature to 0°C or below are generally designed assuming a dew point temperature of -40°C or below, which presents the problem of involving compression and heating processes that consume relatively large amounts of power. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2023-146402 [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention has been made in view of the above circumstances, and aims to provide a dehumidifier that can reduce energy consumption in a carbon dioxide capture system that directly captures carbon dioxide from the atmosphere, and a carbon dioxide capture system equipped with a dehumidifier. [Means for solving the problem]

[0009] A first aspect of the present invention is a dehumidifying device used in a carbon dioxide recovery system that directly recovers carbon dioxide from the atmosphere, which removes moisture from the atmosphere, and is characterized by comprising: a compressor for compressing a heat transfer medium; a condenser for releasing the heat from the heat transfer medium compressed by the compressor to the outside; an expansion valve for reducing the pressure of the heat transfer medium supplied from the condenser; an evaporator for evaporating the heat transfer medium supplied from the expansion valve and absorbing heat from the outside; and a blower for taking in air and sending pre-treated gas, which is cooled by passing through the evaporator and from which moisture has been removed, toward the carbon dioxide recovery device of the carbon dioxide recovery system.

[0010] According to a first aspect of the present invention, in a carbon dioxide recovery system that directly recovers carbon dioxide from the atmosphere, a refrigeration cycle device (i.e., a heat pump) is used as a dehumidifier to remove moisture from the atmosphere. As a result, the dehumidifier according to the first aspect of the present invention can reduce energy consumption compared to dehumidifiers such as desiccant dehumidifiers.

[0011] A second aspect of the present invention is a carbon dioxide recovery system for directly recovering carbon dioxide from the atmosphere, characterized by comprising: a dehumidifier according to the first aspect for removing moisture from the atmosphere; and a carbon dioxide recovery device for adsorbing carbon dioxide from a pre-treated gas that has passed through the dehumidifier and from which the moisture has been removed by the dehumidifier.

[0012] According to a second aspect of the present invention, in a carbon dioxide recovery system that directly recovers carbon dioxide from the atmosphere, a refrigeration cycle device (i.e., a heat pump) is used as a dehumidifier to remove moisture from the atmosphere. As a result, the carbon dioxide recovery system according to the second aspect of the present invention can reduce energy consumption compared to a carbon dioxide recovery system equipped with a dehumidifier such as a desiccant dehumidifier. [Effects of the Invention]

[0013] According to the present invention, there is provided a dehumidifying device capable of suppressing energy consumption in a carbon dioxide recovery system that directly recovers carbon dioxide from the atmosphere, and a carbon dioxide recovery system including the dehumidifying device.

Brief Description of the Drawings

[0014] [Figure 1] It is a schematic diagram showing a carbon dioxide recovery system including a dehumidifying device according to an embodiment of the present invention. [Figure 2] It is a schematic diagram showing a dehumidifying device according to the first embodiment of the present invention. [Figure 3] It is a schematic diagram showing a dehumidifying device according to the second embodiment of the present invention. [Figure 4] It is a schematic diagram showing a dehumidifying device according to the third embodiment of the present invention. [Figure 5] It is a schematic diagram showing a dehumidifying device according to the fourth embodiment of the present invention. [Figure 6] It is a schematic diagram showing a specific example of the carbon dioxide recovery system according to the present embodiment. [Figure 7] It is a timing chart for explaining the operation of the carbon dioxide recovery system according to the present embodiment. [Figure 8] It is a schematic diagram for explaining the operation of the carbon dioxide recovery system according to the present embodiment. [Figure 9] It is a schematic diagram for explaining the operation of the carbon dioxide recovery system according to the present embodiment. [Figure 10] It is a schematic diagram for explaining the operation of the carbon dioxide recovery system according to the present embodiment. [Figure 11] It is a schematic diagram for explaining the operation of the carbon dioxide recovery system according to the present embodiment. [Figure 12] It is a schematic diagram for explaining the operation of the carbon dioxide recovery system according to the present embodiment. [Figure 13] It is a schematic diagram showing a carbon dioxide recovery system according to the first comparative example. [Figure 14] It is a schematic diagram showing a carbon dioxide recovery system according to the second comparative example. [Figure 15]A timing chart for comparing the operation of the carbon dioxide recovery systems according to the first and second comparative examples and the carbon dioxide recovery system according to the present embodiment.

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are preferred specific examples of the present invention, and thus are technically preferably subject to various limitations. However, the scope of the present invention is not limited to these aspects unless there is a description to particularly limit the present invention in the following description. Also, in each drawing, the same reference numerals are assigned to the same components, and detailed descriptions thereof are omitted as appropriate.

[0016] FIG. 1 is a schematic diagram showing a carbon dioxide recovery system including a dehumidifying device according to an embodiment of the present invention. The carbon dioxide recovery system 2 shown in FIG. 1 is a system that directly recovers carbon dioxide from the atmosphere. The carbon dioxide recovery system 2 includes a dehumidifying device 3 and a carbon dioxide recovery device 4. The number of installed carbon dioxide recovery devices 4 may be one or two or more.

[0017] The dehumidifying device 3 is a device that removes moisture as a component that reduces the adsorption efficiency of carbon dioxide in the carbon dioxide recovery device 4 from the atmosphere (that is, air). Details of the dehumidifying device 3 will be described later.

[0018] The carbon dioxide recovery device 4 is provided on the downstream side of the dehumidifying device 3 in the air flow direction, and is a device that adsorbs carbon dioxide from the pretreated gas from which moisture has been removed by the dehumidifying device 3 and that has passed through the dehumidifying device 3. The carbon dioxide recovery device 4 has a carbon dioxide adsorption tank containing a carbon dioxide adsorbent. The carbon dioxide adsorbent is, for example, zeolite or the like, and adsorbs carbon dioxide from the pretreated gas from which moisture has been removed by the dehumidifying device 3 and that has passed through the dehumidifying device 3.

[0019] Furthermore, the carbon dioxide recovery device 4 has a function to release carbon dioxide adsorbed on the carbon dioxide adsorbent from the carbon dioxide adsorbent. For example, the carbon dioxide recovery device 4 has a depressurization device (not shown), such as a depressurization pump or a vacuum pump. The depressurization device releases the carbon dioxide adsorbent that was adsorbed on the carbon dioxide adsorbent from the carbon dioxide adsorbent by placing the carbon dioxide adsorbent contained in the carbon dioxide adsorption tank under reduced pressure.

[0020] Alternatively, for example, the carbon dioxide recovery device 4 has a heating device or heat source (not shown) for heating the adsorbent. The heating device or heat source heats the carbon dioxide adsorbent contained in the carbon dioxide adsorption tank, thereby releasing the carbon dioxide adsorbed on the carbon dioxide adsorbent from the carbon dioxide adsorbent.

[0021] The carbon dioxide capture device 4 then sends the gas containing carbon dioxide released from the carbon dioxide adsorbent to a storage unit (not shown) as concentrated gas. A specific example of the carbon dioxide capture device 4 will be described later.

[0022] Figure 2 is a schematic diagram showing a dehumidifying device according to the first embodiment of the present invention. The dehumidifier 3 according to this embodiment includes a refrigeration cycle device 31. Specifically, the dehumidifier 3 includes a compressor 311, a condenser 312, an expansion valve 313, and an evaporator 314. The dehumidifier 3 further includes a blower 315 and a blower 316. The compressor 311, condenser 312, expansion valve 313, and evaporator 314 are connected in this order by a heat transfer medium piping 317. The heat transfer medium piping 317 is connected to the compressor 311, condenser 312, expansion valve 313, and evaporator 314 to form a closed circuit and circulate the heat transfer medium (i.e., refrigerant).

[0023] The compressor 311 compresses the heat transfer medium flowing through the heat transfer medium piping 317 and supplies the compressed heat transfer medium to the condenser 312. The temperature of the heat transfer medium compressed by the compressor 311 is, for example, about 100°C.

[0024] The condenser 312 compresses the heat transfer medium supplied by the compressor 311 and releases the heat to the outside. The heat released from the condenser 312 is then released to the outside by air blown from a blower 316 installed near the condenser 312, and carried out by the dehumidifier 3. The temperature of the heat transfer medium that has passed through the condenser 312 is, for example, about 40°C.

[0025] The expansion valve 313 reduces the pressure of the heat transfer medium supplied from the condenser 312 and supplies the reduced-pressure heat transfer medium to the evaporator 314. The temperature of the heat transfer medium after depressurization by the expansion valve 313 is, for example, about 0°C.

[0026] The evaporator 314 is depressurized by the expansion valve 313 and absorbs heat from the outside by evaporating the heat transfer medium supplied from the expansion valve 313. The temperature of the heat transfer medium that has passed through the evaporator 314 is, for example, about 2°C.

[0027] The blower 315 draws outside air into the dehumidifier 3. Alternatively, outside air may be supplied into the dehumidifier 3 by a blower (not shown) installed outside the dehumidifier 3.

[0028] The air taken into the dehumidifier 3 is cooled by passing through the evaporator 314. At this time, the moisture contained in the air is removed. The gas, cooled by passing through the evaporator 314 and from which moisture has been removed, is sent by the blower 315 toward the carbon dioxide recovery device 4 (see Figure 1) as pre-treated gas. The temperature of the pre-treated gas cooled by passing through the evaporator 314 is, for example, about -10°C. The dew point temperature of the pre-treated gas from which moisture has been removed by passing through the evaporator 314 is, for example, about -20°C or higher and 0°C or lower.

[0029] According to the dehumidifier 3 of this embodiment, in a carbon dioxide recovery system 2 that directly recovers carbon dioxide from the atmosphere, the refrigeration cycle device 31 (i.e., heat pump) is used in the dehumidifier 3 that removes moisture from the air. As a result, the dehumidifier 3 of this embodiment can reduce energy consumption compared to dehumidifiers such as desiccant dehumidifiers.

[0030] Next, a second embodiment of the present invention will be described. In cases where the components of the dehumidifier 3A according to the second embodiment are the same as those of the dehumidifier 3 according to the first embodiment described above with respect to Figure 2, redundant explanations will be omitted as appropriate, and the differences will be the focus of the explanation below.

[0031] Figure 3 is a schematic diagram showing a dehumidifying device according to a second embodiment of the present invention. The dehumidifier 3A according to this embodiment comprises a refrigeration cycle device 32 and a heating device 33. That is, the dehumidifier 3A according to this embodiment further comprises a heating device 33 compared to the dehumidifier 3 described above with respect to Figure 2. In this respect, the dehumidifier 3A according to this embodiment differs from the dehumidifier 3 described above with respect to Figure 2. The heating device 33 is provided downstream of the refrigeration cycle device 32 in the direction of airflow.

[0032] The refrigeration cycle device 32 is the same as the refrigeration cycle device 31 described above with respect to Figure 2. That is, the compressor 321 is the same as the compressor 311 described above with respect to Figure 2. The condenser 322 is the same as the condenser 312 described above with respect to Figure 2. The expansion valve 323 is the same as the expansion valve 313 described above with respect to Figure 2. The evaporator 324 is the same as the evaporator 314 described above with respect to Figure 2. The first blower 325 is the same as the blower 315 described above with respect to Figure 2. The heat transfer medium piping 327 is the same as the heat transfer medium piping 317 described above with respect to Figure 2.

[0033] In this embodiment of the dehumidifier 3A, no blower is installed near the condenser 322. That is, no blower corresponding to the blower 316 mentioned above in Figure 2 is installed.

[0034] As mentioned above with respect to Figure 2, the temperature of the pre-treated gas cooled by passing through the evaporator 314 may be as low as, for example, 0°C or below. In this case, the carbon dioxide adsorbent (e.g., zeolite) contained in the carbon dioxide adsorption tank of the carbon dioxide recovery device 4 (see Figure 1) may increase the amount of carbon dioxide adsorbed over a given period, while decreasing the amount of carbon dioxide released over a given period.

[0035] In contrast, the dehumidifier 3A according to this embodiment includes a heating device 33. Specifically, the dehumidifier 3A includes a heat exchanger 331, a second blower 332, a pump 333, and fluid piping 334. Note that the second blower 332 is not necessarily required. The heat exchanger 331, the pump 333, and the condenser 322 are connected in this order by the fluid piping 334.

[0036] Pump 333 pumps out fluid heated by the condensation heat generated in the condenser 322. Fluid piping 334 is connected to the heat exchanger 331 and the condenser 322, forming a closed circuit. Fluid piping 334 guides the fluid pumped out by pump 333, i.e., the fluid heated by the condensation heat generated in the condenser 322, and circulates the fluid between the heat exchanger 331 and the condenser 322.

[0037] The heat exchanger 331 performs heat exchange between the fluid supplied from the condenser 322 through the fluid piping 334 and the pre-treated gas sent in from the first blower 325. The temperature of the fluid supplied to the heat exchanger 331 after passing through the condenser 322 is, for example, about 40°C. As a result, the pre-treated gas passing through the heat exchanger 331 is heated. The gas heated by passing through the heat exchanger 331 is sent as heated gas towards the carbon dioxide recovery device 4 by the first blower 325 and the second blower 332. The temperature of the fluid that has passed through the heat exchanger 331 is, for example, about 30°C. The temperature of the heated gas heated by passing through the heat exchanger 331 is, for example, about 20°C.

[0038] According to the dehumidifier 3A of this embodiment, even if the temperature of the pre-treated gas, which has been cooled and had moisture removed from the air by passing through the evaporator 314, falls below 0°C, the heating device 33 can heat the pre-treated gas supplied from the first blower 325 in the heat exchanger 331 and supply the heated gas at approximately 20°C to the carbon dioxide recovery device 4. As a result, the dehumidifier 3A of this embodiment can reduce energy consumption and prevent a decrease in the amount of carbon dioxide released from the carbon dioxide adsorbent (e.g., zeolite) over any given period.

[0039] Furthermore, the dehumidifier 3A according to this embodiment may perform control to switch the operation of the heating device 33 depending on the temperature of the pre-treated gas. In this case, the dehumidifier 3A can further reduce energy consumption by switching the operation of the heating device 33 depending on the environment in which the dehumidifier 3A is installed.

[0040] Next, a third embodiment of the present invention will be described. If the components of the dehumidifier 3B according to the third embodiment are the same as those of the dehumidifier 3 according to the first embodiment described above with respect to Figure 2, and the dehumidifier 3A described above with respect to Figure 3, then redundant explanations will be omitted as appropriate, and the following explanation will focus on the differences.

[0041] Figure 4 is a schematic diagram showing a dehumidifying device according to a third embodiment of the present invention. The dehumidifier 3B according to this embodiment comprises a first refrigeration cycle device 34, a second refrigeration cycle device 35, and a heating device 36. In other words, the dehumidifier 3B according to this embodiment has a structure in which one refrigeration cycle device is added compared to the dehumidifier 3A described above with respect to Figure 3. Note that the dehumidifier 3B does not necessarily have to include the heating device 36.

[0042] The first refrigeration cycle device 34 is the same as the refrigeration cycle device 31 described above with respect to Figure 2. That is, the first compressor 341 is the same as the compressor 311 described above with respect to Figure 2. The first condenser 342 is the same as the condenser 312 described above with respect to Figure 2. The first expansion valve 343 is the same as the expansion valve 313 described above with respect to Figure 2. The first evaporator 344 is the same as the evaporator 314 described above with respect to Figure 2. The first blower 345 is the same as the blower 315 described above with respect to Figure 2. The blower 346 is the same as the blower 316 described above with respect to Figure 2. The first heat transfer medium piping 347 is the same as the heat transfer medium piping 317 described above with respect to Figure 2. The heat transfer medium flowing through the first heat transfer medium piping 347 is an example of the "first heat transfer medium" of the present invention.

[0043] The second refrigeration cycle device 35 is located downstream of the first refrigeration cycle device 34 in the direction of airflow. The second refrigeration cycle device 35 is the same as the refrigeration cycle device 31 described above with respect to Figure 2. That is, the second compressor 351 is the same as the compressor 311 described above with respect to Figure 2. The second condenser 352 is the same as the condenser 312 described above with respect to Figure 2. The second expansion valve 353 is the same as the expansion valve 313 described above with respect to Figure 2. The second evaporator 354 is the same as the evaporator 314 described above with respect to Figure 2. The second blower 355 is the same as the blower 315 described above with respect to Figure 2. The second heat transfer medium piping 357 is the same as the heat transfer medium piping 317 described above with respect to Figure 2. The heat transfer medium flowing through the second heat transfer medium piping 357 is an example of the "second heat transfer medium" of the present invention.

[0044] Furthermore, in the second refrigeration cycle device 35, similar to the refrigeration cycle device 32 described above with respect to Figure 3, no blower is installed near the second condenser 352. That is, a blower equivalent to the blower 346 of the first refrigeration cycle device 34 is not installed. Also, the dehumidifier 3B according to this embodiment does not necessarily have to be equipped with both the first blower 345 and the second blower 355, and may be equipped with at least one of the first blower 345 and the second blower 355.

[0045] The heating device 36 is located downstream of the second refrigeration cycle device 35 in the direction of airflow. The heating device 36 is the same as the heating device 33 described above with respect to Figure 3. That is, the heat exchanger 361 is the same as the heat exchanger 331 described above with respect to Figure 3. The third blower 362 is the same as the second blower 332 described above with respect to Figure 3. The pump 363 is the same as the pump 333 described above with respect to Figure 3. The fluid piping 364 is the same as the fluid piping 334 described above with respect to Figure 2. Note that, as described above with respect to Figure 3, the third blower 362 is not necessarily required.

[0046] As mentioned earlier with respect to Figure 2, the temperature of the pre-treated gas cooled by passing through the evaporator 314 may be as low as, for example, 0°C or below. In this case, the moisture contained in the air is exposed to temperatures below 0°C, and frost may form in the evaporator 314. This necessitates a defrosting operation, which can make it difficult to reduce energy consumption.

[0047] In contrast, the dehumidifier 3B according to this embodiment comprises a first refrigeration cycle device 34 and a second refrigeration cycle device 35.

[0048] Air taken into the first refrigeration cycle unit 34 is cooled by passing through the first evaporator 344. At this time, moisture contained in the air is removed. The gas that has been cooled by passing through the first evaporator 344 and from which moisture has been removed is sent to the second refrigeration cycle unit 35 by the first blower 345 as the first pre-treated gas. The temperature of the first pre-treated gas that has been cooled by passing through the first evaporator 344 is, for example, about 5°C.

[0049] Next, the air taken into the second refrigeration cycle device 35 is further cooled by passing through the second evaporator 354. At this time, more moisture contained in the air is removed. The gas, cooled by passing through the second evaporator 354 and from which moisture has been removed, is sent to the heating device 36 by the second blower 355 as the second pre-treated gas. The temperature of the second pre-treated gas, cooled by passing through the second evaporator 354, is, for example, about -10°C.

[0050] The second pre-treated gas supplied to the heating device 36 is heated by the heat exchanger 361. That is, the heat exchanger 361 performs heat exchange between the fluid supplied from the second condenser 352 through the fluid piping 364 and the second pre-treated gas supplied from the second blower 355. The temperature of the fluid supplied to the heat exchanger 361 after passing through the second condenser 352 is, for example, about 40°C. As a result, the second pre-treated gas passing through the heat exchanger 361 is heated. The gas heated by passing through the heat exchanger 361 is then supplied as heated gas towards the carbon dioxide recovery device 4 (see Figure 1) by the first blower 345, the second blower 355, and the third blower 362. The temperature of the fluid that has passed through the heat exchanger 361 is, for example, about 30°C. The temperature of the heated gas heated by passing through the heat exchanger 361 is, for example, about 20°C.

[0051] As described above, the dehumidifier 3B according to this embodiment includes a first evaporator 344 and a second evaporator 354. In other words, the air taken into the dehumidifier 3B according to this embodiment is cooled in two stages in the first evaporator 344 and the second evaporator 354. Therefore, the dehumidifier 3B according to this embodiment can reduce the amount of air whose temperature falls below 0°C and reduce the amount of moisture in the air exposed to temperatures below 0°C. As a result, the dehumidifier 3B according to this embodiment can reduce the amount of water condensation. This makes it possible for the dehumidifier 3B according to this embodiment to reduce the energy consumption required for defrosting operation.

[0052] Furthermore, the dehumidifier 3B according to this embodiment comprises a first refrigeration cycle device 34 and a second refrigeration cycle device 35. In other words, a single compressor is not used in common for the first evaporator 344 and the second evaporator 354. Instead, the first refrigeration cycle device 34, which has a first compressor 341, a first condenser 342, a first expansion valve 343, and a first evaporator 344, and the second refrigeration cycle device 35, which has a second compressor 351, a second condenser 352, a second expansion valve 353, and a second evaporator 354, exist independently of each other. Therefore, the dehumidifier 3B according to this embodiment can further reduce the energy consumption required for defrosting operation. As a result, the dehumidifier according to this embodiment can further reduce energy consumption.

[0053] Furthermore, since the dehumidifier 3B according to this embodiment is equipped with a heating device 36, it is possible to suppress a decrease in the amount of carbon dioxide released from the carbon dioxide adsorbent (e.g., zeolite) over any given period. This is as described above with respect to Figure 3.

[0054] Furthermore, the dehumidifier 3B according to this embodiment may perform control to operate only one of the first evaporator 344 and the second evaporator 354. In this case, the dehumidifier 3B can further reduce energy consumption by switching the number of stages of the evaporator that cools the air according to the environment in which the dehumidifier 3B is installed. In addition, the dehumidifier 3B according to this embodiment may perform control to switch whether or not the heating device 36 is operated according to the temperature of the second pre-treated gas. In this case, the same effects as described above with respect to Figure 3 can be obtained.

[0055] Furthermore, in the dehumidifier 3B according to this embodiment, the example given is that the fluid piping 364 is connected to the second condenser 352. However, the fluid piping 364 is not limited to being connected to the second condenser 352, but may also be connected to the first condenser 342, or to both the first condenser 342 and the second condenser 352.

[0056] Next, a fourth embodiment of the present invention will be described. If the components of the dehumidifier 3C according to the fourth embodiment are the same as those of the dehumidifier 3 according to the first embodiment described above with respect to Figure 2, the dehumidifier 3A according to the second embodiment described above with respect to Figure 3, and the dehumidifier 3B according to the third embodiment described above with respect to Figure 4, then redundant explanations will be omitted as appropriate, and the differences will be the focus of the explanation below.

[0057] Figure 5 is a schematic diagram showing a dehumidifying device according to the fourth embodiment of the present invention. The dehumidifier 3C according to this embodiment comprises a first refrigeration cycle device 34C, a second refrigeration cycle device 35C, and a heating device 36C.

[0058] The first refrigeration cycle device 34C does not have a first blower 345, compared to the first refrigeration cycle device 34 described above with respect to Figure 4. The other structures are the same as those of the first refrigeration cycle device 34 described above with respect to Figure 4. The temperature of the first pre-treated gas cooled by passing through the first evaporator 344 is, for example, about 5°C.

[0059] The second refrigeration cycle device 35C is the same as the second refrigeration cycle device 35C described above with respect to Figure 4. The dehumidifier 3C according to this embodiment may also include both the first blower 345 (see Figure 4) and the second blower 355. In other words, the dehumidifier 3C according to this embodiment only needs to include at least one of the first blower 345 and the second blower 355. The temperature of the second pre-treated gas cooled by passing through the second evaporator 354 is, for example, about -10°C.

[0060] The heating device 36C is located downstream of the second refrigeration cycle device 35C in the direction of airflow, and includes a heat exchanger 361, a pump 363, fluid piping 364, a first path 365, and a second path 366.

[0061] The second pre-treated gas, which is sent to the heating device 36C and guided to the first path 365, does not pass through the heat exchanger 361 but is instead guided to the carbon dioxide recovery device 4 (see Figure 1). Therefore, the second pre-treated gas guided to the first path 365 is not heated in the heat exchanger 361 and is guided to the carbon dioxide recovery device 4 as the second pre-treated gas. The temperature of the second pre-treated gas guided to the carbon dioxide recovery device 4 via the first path 365 is, for example, about -10°C.

[0062] On the other hand, the second pre-treated gas, which is sent to the heating device 36C and guided to the second path 366, passes through the heat exchanger 361 and is heated by the heat exchanger 361. That is, the heat exchanger 361 performs heat exchange between the fluid supplied from the second condenser 352 through the fluid piping 364 and the second pre-treated gas guided to the second path 366. The temperature of the fluid that passes through the second condenser 352 and is supplied to the heat exchanger 361 is, for example, about 40°C.

[0063] As a result, the second pre-treated gas passing through the heat exchanger 361 is heated. The gas heated by passing through the heat exchanger 361 is then sent as heated gas through the second path 366 by the second blower 355 towards the carbon dioxide recovery device 4. The temperature of the heated gas led to the carbon dioxide recovery device 4 through the second path 366 is, for example, about 20°C. The temperature of the fluid that has passed through the heat exchanger 361 is, for example, about 30°C.

[0064] The rest of the structure is the same as that of the dehumidifier 3B described in Figure 4. Furthermore, the heating device 36C shown in Figure 5 may be provided in the dehumidifier 3A according to the second embodiment as a replacement for the heating device 33 described above with respect to Figure 3. In other words, the dehumidifier 3A described above with respect to Figure 3 may be equipped with the heating device 36C shown in Figure 5 as a replacement for the heating device 33 described above with respect to Figure 3.

[0065] In this case, the pre-treated gas sent to the heating device 36C and guided to the first path 365 does not pass through the heat exchanger 331, but is instead guided to the carbon dioxide recovery device 4 (see Figure 1). Therefore, the pre-treated gas guided to the first path 365 is not heated in the heat exchanger 331 and is guided to the carbon dioxide recovery device 4 as pre-treated gas. The temperature of the pre-treated gas guided to the carbon dioxide recovery device 4 via the first path 365 is, for example, about -10°C.

[0066] On the other hand, the pre-treated gas sent to the heating device 36C and guided to the second path 366 passes through the heat exchanger 331 and is heated by the heat exchanger 331. That is, the heat exchanger 331 performs heat exchange between the fluid supplied from the condenser 322 through the fluid piping 364 and the pre-treated gas guided to the second path 366. The temperature of the fluid that passes through the condenser 322 and is supplied to the heat exchanger 331 is, for example, about 40°C.

[0067] As a result, the pre-treated gas passing through the heat exchanger 331 is heated. The gas heated by passing through the heat exchanger 331 is then sent as heated gas through the second path 366 by the first blower 325 towards the carbon dioxide recovery device 4. The temperature of the heated gas that is led to the carbon dioxide recovery device 4 through the second path 366 is, for example, about 20°C. The temperature of the fluid that has passed through the heat exchanger 331 is, for example, about 30°C.

[0068] Next, a specific example of the carbon dioxide capture system 2 according to this embodiment will be described with reference to the drawings. Figure 6 is a schematic diagram showing a specific example of a carbon dioxide capture system according to this embodiment.

[0069] The carbon dioxide recovery system 2 shown in Figure 6 comprises a dehumidifier 3C, a carbon dioxide recovery device 4, and a control device 5. The dehumidifier 3C is as described above with respect to Figure 5. In addition, the carbon dioxide recovery system 2 shown in Figure 6 may also include a dehumidifier 3A having a heating device 36C as described above with respect to Figure 5, instead of the heating device 33 described above with respect to Figure 3. In the following explanation, we will take the case in which the carbon dioxide recovery system 2 shown in Figure 6 is equipped with the dehumidifier 3C described above with respect to Figure 5 as an example.

[0070] The carbon dioxide recovery device 4 includes a first carbon dioxide adsorption tank 411, a second carbon dioxide adsorption tank 412, a first heat source 421, a second heat source 422, a vacuum pump 461, a first blower 471, and a second blower 472. The first carbon dioxide adsorption tank 411 and the second carbon dioxide adsorption tank 412 in this embodiment are examples of the "adsorption tank" of the present invention. As described above with respect to Figure 1, the first carbon dioxide adsorption tank 411 and the second carbon dioxide adsorption tank 412 each contain a carbon dioxide adsorbent such as zeolite.

[0071] The first heating source 421 heats the carbon dioxide adsorbent contained in the first carbon dioxide adsorption tank 411, thereby releasing the carbon dioxide adsorbed on the carbon dioxide adsorbent from the adsorbent. The second heating source 422 heats the carbon dioxide adsorbent contained in the second carbon dioxide adsorption tank 412, thereby releasing the carbon dioxide adsorbed on the carbon dioxide adsorbent from the adsorbent. The vacuum pump 461 vacuums the first carbon dioxide adsorption tank 411 and the second carbon dioxide adsorption tank 412, placing the carbon dioxide adsorbents contained in each tank under reduced pressure, thereby releasing the carbon dioxide adsorbed on the carbon dioxide adsorbent from the adsorbent.

[0072] The carbon dioxide recovery device 4 further includes a first adsorption valve 431, a second adsorption valve 432, a third adsorption valve 433, a fourth adsorption valve 434, a fifth adsorption valve 435, a sixth adsorption valve 436, a first exhaust valve 441, a second exhaust valve 442, a first outlet valve 451, and a second outlet valve 452.

[0073] The control device 5 includes, for example, a CPU (Central Processing Unit) and an FPGA (Field Programmable Gate Array), and performs tasks such as program startup, signal control processing, calculations, and drive control of a display unit (not shown) based on signals (commands) transmitted from the operation unit (not shown). In other words, the control device 5 controls the entire carbon dioxide capture system 2. The control device 5 also transmits signals to each valve provided in the carbon dioxide capture device 4 to control the operation of each valve, and receives signals from sensors (not shown) provided in the dehumidifier 3C and the carbon dioxide capture device 4.

[0074] Figure 7 is a timing chart illustrating the operation of the carbon dioxide capture system according to this embodiment. Figures 8 to 12 are schematic diagrams illustrating the operation of the carbon dioxide capture system according to this embodiment.

[0075] At timing T1 shown in Figure 7, the second heating source 422 is set to "on" based on a signal transmitted from the control device 5. Also, the second exhaust valve 442 opens based on a signal transmitted from the control device 5. As a result, the carbon dioxide adsorbed on the carbon dioxide adsorbent in the second carbon dioxide adsorption tank 412 is released from the carbon dioxide adsorbent. As shown in Figure 8, the gas containing the released carbon dioxide is guided as concentrated gas towards the storage unit (not shown) by the second blower 472.

[0076] Furthermore, at timing T1, the first heating source 421 is set to "off" based on a signal transmitted from the control device 5. Also, the third adsorption valve 433, the fifth adsorption valve 435, and the first outlet valve 451 are opened based on a signal transmitted from the control device 5. As a result, as shown in Figure 8, the heated gas is guided to the first carbon dioxide adsorption tank 411 through the second path 366 of the dehumidifier 3C and passes through the first carbon dioxide adsorption tank 411. The gas that has passed through the first carbon dioxide adsorption tank 411 is discharged to the outside of the carbon dioxide recovery device 4 by the first blower 471 as recovered gas.

[0077] As mentioned above with respect to Figure 5, the temperature of the heated gas is, for example, about 20°C. As the heated gas passes through the first carbon dioxide adsorption tank 411, the carbon dioxide contained in the heated gas is adsorbed by the carbon dioxide adsorbent contained in the first carbon dioxide adsorption tank 411.

[0078] Next, at timing T2 shown in Figure 7, the second heating source 422 is set to "off" based on a signal transmitted from the control device 5. Also, the second adsorption valve 432, the sixth adsorption valve 436, and the second outlet valve 452 open based on a signal transmitted from the control device 5. Furthermore, the second exhaust valve 442 closes based on a signal transmitted from the control device 5. As a result, as shown in Figure 9, the second pre-treated gas is guided to the second carbon dioxide adsorption tank 412 through the first path 365 of the dehumidifier 3C and passes through the second carbon dioxide adsorption tank 412.

[0079] As mentioned above with respect to Figure 5, the temperature of the second pre-treated gas is, for example, about -10°C. Therefore, as the second pre-treated gas passes through the second carbon dioxide adsorption tank 412, the carbon dioxide adsorbent contained in the second carbon dioxide adsorption tank 412 is cooled by the second pre-treated gas. Thus, in the carbon dioxide recovery system 2 according to this embodiment, a heating operation is performed in which the carbon dioxide adsorbent in the second carbon dioxide adsorption tank 412 is heated by the second heat source 422 to release carbon dioxide from the carbon dioxide adsorbent, and then a cooling operation is performed in which the carbon dioxide adsorbent in the second carbon dioxide adsorption tank 412 is cooled by the second pre-treated gas that has been introduced to the second carbon dioxide adsorption tank 412 through the first path 365.

[0080] Next, at timing T3 shown in Figure 7, the second adsorption valve 432 closes based on a signal transmitted from the control device 5. Also, the fourth adsorption valve 434 opens based on a signal transmitted from the control device 5. As a result, as shown in Figure 10, the heated gas is guided to the second carbon dioxide adsorption tank 412 through the second path 366 of the dehumidifier 3C and passes through the second carbon dioxide adsorption tank 412. The gas that has passed through the second carbon dioxide adsorption tank 412 is discharged to the outside of the carbon dioxide recovery device 4 by the first blower 471 as recovered gas.

[0081] As mentioned above with respect to Figure 5, the temperature of the heated gas is, for example, about 20°C. As the heated gas passes through the second carbon dioxide adsorption tank 412, the carbon dioxide contained in the heated gas is adsorbed by the carbon dioxide adsorbent contained in the second carbon dioxide adsorption tank 412.

[0082] Next, at timing T4 shown in Figure 7, the first heating source 421 is set to "on" based on a signal transmitted from the control device 5. Also, the first exhaust valve 441 opens based on a signal transmitted from the control device 5. Furthermore, the third adsorption valve 433, the fifth adsorption valve 435, and the first outlet valve 451 close based on a signal transmitted from the control device 5. As a result, the carbon dioxide adsorbed on the carbon dioxide adsorbent in the first carbon dioxide adsorption tank 411 is released from the carbon dioxide adsorbent. As shown in Figure 11, the gas containing the released carbon dioxide is guided as concentrated gas towards the storage unit (not shown) by the second blower 472.

[0083] Next, at timing T5 shown in Figure 7, the first heating source 421 is set to "off" based on a signal transmitted from the control device 5. Also, the first adsorption valve 431, the fifth adsorption valve 435, and the first outlet valve 451 open based on a signal transmitted from the control device 5. Furthermore, the first exhaust valve 441 closes based on a signal transmitted from the control device 5. As a result, as shown in Figure 12, the second pre-treated gas is guided to the first carbon dioxide adsorption tank 411 through the first path 365 of the dehumidifier 3C and passes through the first carbon dioxide adsorption tank 411.

[0084] As mentioned above with respect to Figure 5, the temperature of the second pre-treated gas is, for example, about -10°C. Therefore, as the second pre-treated gas passes through the first carbon dioxide adsorption tank 411, the carbon dioxide adsorbent contained in the first carbon dioxide adsorption tank 411 is cooled by the second pre-treated gas. Thus, in the carbon dioxide recovery system 2 according to this embodiment, a heating operation is performed in which the carbon dioxide adsorbent in the first carbon dioxide adsorption tank 411 is heated by the first heat source 421 to release carbon dioxide from the carbon dioxide adsorbent, and then a cooling operation is performed in which the carbon dioxide adsorbent in the first carbon dioxide adsorption tank 411 is cooled by the second pre-treated gas that has been introduced to the first carbon dioxide adsorption tank 411 through the first path 365.

[0085] Next, at timing T6 shown in Figure 7, the first adsorption valve 431 closes based on a signal transmitted from the control device 5. Also, the third adsorption valve 433 opens based on a signal transmitted from the control device 5. In other words, the control at timing T1 is executed again. Thus, the carbon dioxide capture system 2 according to this embodiment repeatedly executes the control of timings T1 to T6 in this order.

[0086] Next, we will describe a carbon dioxide capture system related to a comparative example. In cases where the components of the comparative example carbon dioxide capture system are the same as those of the carbon dioxide capture system 2 according to this embodiment, redundant explanations will be omitted as appropriate, and the differences will be the focus of the explanation below.

[0087] Figure 13 is a schematic diagram representing the carbon dioxide capture system for the first comparative example. Figure 14 is a schematic diagram representing the carbon dioxide capture system for the second comparative example. Figure 15 is a timing chart comparing the operation of the carbon dioxide capture systems according to the first and second comparative examples, as well as the carbon dioxide capture system according to the present embodiment.

[0088] Figure 15(a) is a timing chart illustrating the operation of carbon dioxide capture system 2A according to the first comparative example. Figure 15(b) is a timing chart illustrating the operation of carbon dioxide capture system 2B according to the second comparative example. Figure 15(c) is a timing chart illustrating the operation of the carbon dioxide capture system according to this embodiment. In other words, the timing chart shown in Figure 15(c) is the same as the timing chart described above with respect to Figure 7.

[0089] As shown in Figure 13, the carbon dioxide recovery system 2A according to the first comparative example comprises a dehumidifier 3D, a carbon dioxide recovery device 4A, and a control device 5. The dehumidifier 3D differs from the dehumidifier 3C of this embodiment described above with respect to Figure 5. Specifically, the temperature of the pre-treated gas sent from the dehumidifier 3D to the carbon dioxide recovery device 4A is higher than the ambient temperature, for example, about 30°C. In other words, unlike the dehumidifier 3C of this embodiment described above with respect to Figure 5, the dehumidifier 3D cannot send pre-treated gas at 0°C or below to the carbon dioxide recovery device 4A.

[0090] The carbon dioxide recovery device 4A, like the carbon dioxide recovery device 4 of this embodiment described above with respect to Figure 6, includes a first carbon dioxide adsorption tank 411, a second carbon dioxide adsorption tank 412, a first heat source 421, a second heat source 422, a vacuum pump 461, a first blower 471, and a second blower 472.

[0091] As described above with respect to Figure 6, the first heat source 421 heats the carbon dioxide adsorbent contained in the first carbon dioxide adsorption tank 411, thereby releasing the carbon dioxide adsorbed on the carbon dioxide adsorbent from the adsorbent. The second heat source 422 heats the carbon dioxide adsorbent contained in the second carbon dioxide adsorption tank 412, thereby releasing the carbon dioxide adsorbed on the carbon dioxide adsorbent from the adsorbent. The vacuum pump 461 vacuums the first carbon dioxide adsorption tank 411 and the second carbon dioxide adsorption tank 412, placing the carbon dioxide adsorbents contained in each of the tanks under reduced pressure, thereby releasing the carbon dioxide adsorbed on the carbon dioxide adsorbent from the adsorbent.

[0092] As mentioned above, the temperature of the pre-treated gas sent from the dehumidifier 3D to the carbon dioxide recovery device 4A is higher than the ambient temperature, for example, about 30°C. Therefore, compared to the carbon dioxide recovery system 2 according to this embodiment, the amount of carbon dioxide adsorbed by the carbon dioxide adsorbent contained in the first carbon dioxide adsorption tank 411 and the second carbon dioxide adsorption tank 412 over any given period is less. Furthermore, in the cooling operation after the heating operation that releases the carbon dioxide adsorbed on the carbon dioxide adsorbent from the carbon dioxide adsorbent, the carbon dioxide adsorbent is cooled by the pre-treated gas, which is at a temperature higher than the ambient temperature.

[0093] As a result, as shown in the timing chart in Figure 15(a), the cooling time of the carbon dioxide adsorbent is longer compared to the carbon dioxide recovery system 2 according to this embodiment.

[0094] As shown in Figure 14, the carbon dioxide recovery system 2B according to the second comparative example comprises a dehumidifier 3D, a carbon dioxide recovery device 4B, and a control device 5. The dehumidifier 3D is as described above with respect to Figure 13.

[0095] The carbon dioxide recovery device 4B, compared to the carbon dioxide recovery device 4A described above with respect to Figure 13, further includes a first cooling heat exchanger 481 and a second cooling heat exchanger 482. The first cooling heat exchanger 481 and the second cooling heat exchanger 482 each perform heat exchange between the heat transfer medium and the pre-treated gas supplied from the dehumidifier 3D.

[0096] The temperature of the heat transfer medium passing through the first cooling heat exchanger 481 and the second cooling heat exchanger 482 is set to approximately 1°C or higher and 10°C or lower, from the viewpoint of preventing the heat transfer medium piping from freezing. Therefore, the pre-treated gas supplied from the dehumidifier 3D is cooled by passing through the first cooling heat exchanger 481 and the second cooling heat exchanger 482. The temperature of the pre-treated gas cooled by passing through the first cooling heat exchanger 481 and the second cooling heat exchanger 482 is, for example, approximately 5°C.

[0097] Therefore, the amount of carbon dioxide adsorbed by the carbon dioxide adsorbent contained in the first carbon dioxide adsorption tank 411 and the second carbon dioxide adsorption tank 412 over any given period is greater than that of the carbon dioxide recovery device 4A described above in Figure 13. On the other hand, energy other than that consumed in the dehumidifier 3D is consumed in the first cooling heat exchanger 481 and the second cooling heat exchanger 482. In other words, it is difficult to reduce energy consumption in the carbon dioxide recovery system 2B shown in Figure 14.

[0098] Furthermore, during the cooling operation that follows the heating operation to release the carbon dioxide adsorbed on the carbon dioxide adsorbent from the adsorbent, the carbon dioxide adsorbent is cooled with a pre-treated gas at approximately 5°C. In other words, the carbon dioxide adsorbent of the carbon dioxide recovery device 4A shown in Figure 14 differs from the carbon dioxide adsorbent of the carbon dioxide recovery device 4 of this embodiment described above with respect to Figure 6, in that it is not cooled with a pre-treated gas at 0°C or below.

[0099] As a result, as shown in the timing chart in Figure 15(b), the cooling time of the carbon dioxide adsorbent is longer compared to the carbon dioxide recovery system 2 according to this embodiment.

[0100] In contrast, according to the carbon dioxide recovery system 2 of this embodiment, in the cooling operation following the heating operation that releases carbon dioxide adsorbed on the carbon dioxide adsorbent from the carbon dioxide adsorbent, the carbon dioxide adsorbent is cooled by a second pre-treated gas at 0°C or below (for example, about -10°C). This is as described above with respect to Figures 7 to 12. Therefore, the cooling time of the carbon dioxide adsorbent can be shortened compared to the carbon dioxide recovery system 2A of the first comparative example and the carbon dioxide recovery system 2B of the second comparative example. In addition, the dehumidifier 3C can also perform the cooling function of the carbon dioxide adsorbent. As a result, the carbon dioxide recovery system 2 of this embodiment can reduce energy consumption.

[0101] Furthermore, compared to the carbon dioxide recovery system 2A according to the first comparative example and the carbon dioxide recovery system 2B according to the second comparative example, the carbon dioxide adsorption reaction time in the carbon dioxide adsorbent can be shortened, and the amount of carbon dioxide recovered (i.e., adsorbed) over any given period can be improved. In addition, as described above with respect to Figures 5 to 12, heated gas at approximately 20°C is guided to the first carbon dioxide adsorption tank 411 and the second carbon dioxide adsorption tank 412 through the second path 366. Therefore, the carbon dioxide recovery system 2 according to this embodiment can reduce the energy consumption (i.e., heating energy) in the heating operation that releases carbon dioxide adsorbed on the carbon dioxide adsorbent from the carbon dioxide adsorbent.

[0102] Embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims. The configurations of the above embodiments can be partially omitted or combined in any way different from those described above. [Explanation of Symbols]

[0103] 2: Carbon dioxide capture system, 2A: Carbon dioxide capture system, 2B: Carbon dioxide capture system, 3: Dehumidifier, 3A: Dehumidifier, 3B: Dehumidifier, 3C: Dehumidifier, 3D: Dehumidifier, 4: Carbon dioxide capture system, 4A: Carbon dioxide capture system, 4B: Carbon dioxide capture system, 5: Control device, 31: Refrigeration cycle system, 32: Refrigeration cycle system, 33: Heating device, 34: First refrigeration cycle system, 34C: First refrigeration cycle system, 35: Second refrigeration cycle system, 35C: Second refrigeration cycle system, 36: Heating device, 36C: Heating device, 311: Compressor, 312: Condenser, 313: Expansion valve, 314: Evaporator, 315: Blower, 316: Blower, 317: Heat transfer medium piping, 321: Compressor, 322: Condenser, 323: Expansion valve, 324: Evaporator, 325: First blower, 327: Heat transfer fluid piping, 331: Heat exchanger, 332: Second blower, 333: Pump, 334: Fluid piping, 341: First compressor, 342: First condenser, 343: First expansion valve, 344: First evaporator, 345: First blower, 346: Blower, 347: First heat transfer fluid piping, 351: Second compressor, 352: Second condenser, 353: Second expansion valve, 354: Second evaporator, 355: Second blower, 357: Second heat transfer fluid piping, 361: Heat exchanger, 362: Third blower, 363: Pump, 364: Fluid piping, 365: First path, 366: Second path, 411: First carbon dioxide adsorption tank, 412: Second carbon dioxide adsorption tank, 421: First heat source, 422: Second heat source, 431: First adsorption valve, 432: Second adsorption valve, 433: Third adsorption valve, 434: Fourth adsorption valve, 435: Fifth adsorption valve, 436: Sixth adsorption valve, 441: First exhaust valve, 442: Second exhaust valve, 451: First outlet valve, 452: Second outlet valve, 461: Vacuum pump, 471: First blower, 472: Second blower, 481: First cooling heat exchanger, 482: Second cooling heat exchanger

Claims

1. A dehumidifying device used in a carbon dioxide recovery system that directly recovers carbon dioxide from the atmosphere, which removes moisture from the atmosphere, A first compressor for compressing the first heat transfer medium, A first condenser that releases the heat of the first heat transfer medium compressed by the first compressor to the outside, A first expansion valve for reducing the pressure of the first heat transfer medium supplied from the first condenser, A first evaporator that evaporates the first heat transfer medium supplied from the first expansion valve and absorbs heat from the outside, A blower that takes in air and cools it by passing it through the first evaporator, thereby removing the moisture from the air, and sends the first pre-treated gas toward the carbon dioxide recovery device of the carbon dioxide recovery system. A second compressor for compressing the second heat transfer medium, A second condenser that releases the heat of the second heat transfer medium compressed by the second compressor to the outside, A second expansion valve for reducing the pressure of the second heat transfer medium supplied from the second condenser, A second evaporator that evaporates the second heat transfer medium supplied from the second expansion valve and absorbs heat from the first pre-treated gas, Equipped with, The dehumidifying device is characterized in that the blower cools the second pre-treated gas by passing it through the second evaporator, and sends the second pre-treated gas, from which the moisture has been removed, toward the carbon dioxide recovery device.

2. A fluid pipe connected to at least one of the first condenser and the second condenser, which guides a fluid heated by the condensation heat generated in at least one of the first condenser and the second condenser, A heat exchanger connected to at least one of the first condenser and the second condenser via the fluid piping, which performs heat exchange between the fluid supplied from at least one of the first condenser and the second condenser via the fluid piping and the second pre-treated gas, Furthermore, The dehumidifier according to claim 1, characterized in that the blower sends the heated gas, which has been heated by the second pre-treated gas passing through the heat exchanger, toward the carbon dioxide recovery device.

3. A first path that guides the second pre-treated gas to the carbon dioxide recovery device, A second path for guiding the heated gas to the carbon dioxide recovery device, The dehumidifying device according to claim 2, further comprising the features described above.

4. A carbon dioxide capture system that directly captures carbon dioxide from the atmosphere, A dehumidifier that removes moisture from the atmosphere, A carbon dioxide recovery device that adsorbs carbon dioxide from a second pre-treated gas that has passed through the dehumidifier after the moisture has been removed by the dehumidifier, Equipped with, The dehumidifier described above is A first compressor for compressing the first heat transfer medium, A first condenser that releases the heat of the first heat transfer medium compressed by the first compressor to the outside, A first expansion valve for reducing the pressure of the first heat transfer medium supplied from the first condenser, A first evaporator that evaporates the first heat transfer medium supplied from the first expansion valve and absorbs heat from the outside, A blower that takes in air and cools it by passing it through the first evaporator, thereby removing the moisture from the air, and sends the first pre-treated gas toward the carbon dioxide recovery device. A second compressor for compressing the second heat transfer medium, A second condenser that releases the heat of the second heat transfer medium compressed by the second compressor to the outside, A second expansion valve for reducing the pressure of the second heat transfer medium supplied from the second condenser, A second evaporator that evaporates the second heat transfer medium supplied from the second expansion valve and absorbs heat from the first pre-treated gas, It has, The carbon dioxide recovery system is characterized in that the blower cools the second pre-treated gas by passing it through the second evaporator, and sends the second pre-treated gas, from which the moisture has been removed, toward the carbon dioxide recovery device.

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