CO2 adsorption device

Abstract

A CO2 adsorption device provided with a solid adsorbent (1) is provided with: a refrigeration cycle device that circulates a refrigerant through a compressor (2), a first heat exchanger (3), a pressure reducer (4), and a second heat exchanger (5); and a control device (9) for controlling the operation of the refrigeration cycle device, the second heat exchanger (5) being provided upstream of the location where the adsorbent (1) is provided, and the second heat exchanger (5) being provided upstream of the location where the adsorbent (1) is provided, and the second heat exchanger (5) being provided upstream of the location where the adsorbent (1) is provided. The refrigeration cycle device causes the second heat exchanger (5) to function as an evaporator and performs a dehumidification operation in which moisture contained in the air flow adheres to the surface of the second heat exchanger (5).

Description

Technical Field

[0001] The present invention relates to a CO2 adsorption device using a solid CO2 adsorption material. Background Art

[0002] As a method for reducing the CO2 concentration in gas or recovering CO2 from exhaust gas, a method using a solid CO2 adsorbent is known. As CO2 adsorbents, for example, granular adsorbents are known in which substances such as amine compounds that adsorb CO2 are attached to the surface of a porous material carrier. Such solid CO2 adsorbents adsorb CO2 at room temperature, etc., and then are heated to desorb CO2, thereby being repeatedly used for CO2 adsorption.

[0003] It is known that most solid CO2 adsorbents also have the ability to adsorb gases other than CO2. If moisture (water vapor) in the gas is adsorbed on the adsorbent, there is a problem that the CO2 adsorption capacity of the adsorbent will be reduced. Therefore, for example, in Patent Document 1, the gas is dehumidified by the moisture adsorption rotor and then flows into the CO2 adsorbent, thereby avoiding damage to the adsorption capacity of the adsorbent.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2006-61758 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The moisture adsorption rotor of Patent Document 1 uses a material in which a moisture adsorption material is carried on a substrate in the same manner as a CO2 adsorption material. The moisture adsorption material is heated to remove moisture and is repeatedly used as an adsorption material. However, the energy required for heating for removal is large, which poses a problem in terms of energy saving.

[0009] Therefore, an object of the present disclosure is to realize a CO 2 adsorption device which is excellent in preventing a decrease in CO 2 adsorption capacity and saving energy in a CO 2 adsorption device using a solid CO 2 adsorption material.

[0010] Solutions to Solve Problems

[0011] The CO2 adsorption device disclosed in the present invention is a CO2 adsorption device in which a solid adsorption material for adsorbing CO2 is arranged in a flow path for gas flow, wherein the device comprises: a refrigeration cycle device which circulates a refrigerant in a compressor, a first heat exchanger, a pressure reducer and a second heat exchanger; and a control device which controls the operation of the refrigeration cycle device, wherein the second heat exchanger is arranged in the flow path at a position on the upstream side of the airflow than the position where the adsorption material is arranged, and during the adsorption operation for adsorbing CO2, the refrigeration cycle device makes the second heat exchanger function as an evaporator to perform a dehumidification operation in which moisture contained in the airflow adheres to the surface of the second heat exchanger, and a drainage flow path is provided at the lower part of the second heat exchanger to discharge water falling from the second heat exchanger to the outside of the flow path.

[0012] Effects of the Invention

[0013] The CO 2 adsorption device of the present disclosure performs dehumidification by utilizing a heat exchanger functioning as an evaporator of a refrigeration cycle device, and therefore does not require energy required for heating a moisture adsorbing material, and is excellent in preventing a decrease in adsorption capacity and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the CO 2 adsorption device according to the first embodiment.

[0015] Figure 2 This is a flowchart showing an example of control of the CO 2 adsorption device according to the first embodiment.

[0016] Figure 3 This is a configuration diagram of a CO 2 adsorption device according to a modified example of the first embodiment.

[0017] Figure 4 This is a structural diagram of the CO 2 adsorption device according to the second embodiment.

[0018] Figure 5 This is a structural diagram of a CO 2 adsorption device according to Embodiment 3.

[0019] Figure 6 This is a structural diagram of a CO2 adsorption device according to a fourth embodiment.

[0020] Figure 7 This is a structural diagram of a CO2 adsorption device according to the fifth embodiment.

[0021] Figure 8 This is a structural diagram of the CO2 adsorption device of the sixth embodiment.

[0022] Fig. 9 This is a structural diagram of a CO2 adsorption device according to a seventh embodiment.

[0023] Fig.10This is a structural diagram of the CO2 adsorption device of the eighth embodiment.

[0024] Fig.11 This is a structural diagram of the CO2 adsorption device of the ninth embodiment. DETAILED DESCRIPTION

[0025] The following is an explanation of the embodiments of the CO2 adsorption device disclosed in the present invention using the accompanying drawings. In addition, the accompanying drawings are diagrams of illustrative structures, and the configuration, size, direction, shape, etc. that are not limited by the following description can be appropriately changed. In addition, as long as no contradiction occurs, part of the structure disclosed in the following embodiment can also be combined or replaced with the structure disclosed in other embodiments.

[0026] <Implementation method 1>

[0027] Figure 1 This is a structural diagram of the CO2 adsorption device of Embodiment 1. The CO2 adsorption device is a CO2 adsorption device in which a solid adsorbent material 1 for adsorbing CO2 is arranged in a flow path for gas flow. The adsorbent material 1 is arranged in an adsorption flow path 10 such as a pipe, and the adsorption flow path 10 generates an airflow through a blower 11. The white arrows in the figure indicate the flow of the airflow. In addition, if the adsorption flow path 10 generates an airflow, it is not necessarily necessary to have a blower 11. In addition, when the blower 11 is provided, it can be provided on either the upstream side or the downstream side of the adsorbent material 1. The adsorbent material 1 is arranged to cover the entire flow path cross-section of the adsorption flow path 10 so as to be able to contact the entire airflow flowing in the adsorption flow path 10.

[0028] The gas that flows into the adsorption flow path 10 and becomes the target of CO2 adsorption is a gas containing CO2 and water vapor, and may also contain other gases such as air. The target gas is, for example, a gas with a relatively high CO2 concentration such as combustion gas of a boiler, gas released from alcohol fermentation, outside air introduced from a building for indoor ventilation, air introduced from indoors into a pipe, and other gases with a relatively low CO2 concentration.

[0029] The adsorbent material 1 is, for example, an adsorbent material in which particles, such as an amine compound that adsorbs CO2, are attached to the surface of particles of a porous material and are contained in a container that allows air to circulate inside and outside. Since the substance that adsorbs CO2 is solid, it is described as a solid adsorbent material in the present disclosure. In addition to being contained in a container, the substance that adsorbs CO2 can also be fixed to the surface of a component such as metal, resin, or ceramic to form an integral body. There is an upper limit to the amount of CO2 that can be adsorbed by the adsorbent material 1. The adsorbent material 1 that adsorbs CO2 can be heated to desorb the adsorbed CO2, thereby being able to adsorb CO2 again. Such an adsorbent material 1 not only adsorbs CO2, but sometimes also adsorbs water vapor, and can reduce water vapor from the target gas before CO2 adsorption.

[0030] The airflow in the adsorption flow path 10 flows in contact with the substance inside the adsorption material 1. At this time, since CO2 is adsorbed by the substance, the CO2 concentration on the downstream side of the adsorption material 1 is lower than that on the upstream side. If the adsorption material 1 adsorbs CO2 until it approaches the upper limit value that can be adsorbed, the adsorption capacity decreases. The adsorption material 1 with sufficient adsorption capacity can be replaced at an appropriate time when the adsorption amount approaches the upper limit value. The figure shows an example in which the adsorption material 1 is stationary in the adsorption flow path 10, but for example, a rotor-type adsorption material 1 that alternately repeats adsorption and desorption by rotation as in the existing literature can also be used.

[0031] The CO2 adsorption device is equipped with a vapor compression refrigeration cycle device, which is connected by a pipe 8 so that the refrigerant circulates in the compressor 2, the first heat exchanger 3, the pressure reducer 4 and the second heat exchanger 5. The operating state of the compressor 2, the pressure reducer 4 and the like of the refrigeration cycle device is controlled by the control device 9. In the refrigeration cycle device, the refrigerant is sucked into the compressor 2 in a gaseous state and compressed into a high-temperature and high-pressure gas and discharged, condensed into a liquid state by the first heat exchanger 3 functioning as a condenser, and reduced in pressure by the pressure reducer 4 to become a low-temperature and low-pressure refrigerant. As the refrigerant, a refrigerant with a global warming potential (GWP) of less than 10 as a main component, a hydrofluoroolefin, a hydrocarbon, or CO2 is preferably used. The refrigerant evaporates through the second heat exchanger 5 functioning as an evaporator to become a gas and is sucked into the compressor 2 again. The arrows in the figure indicate the direction of the refrigerant flow. The heat exchanger functioning as a condenser dissipates heat to the outside, and the heat exchanger functioning as a condenser absorbs heat from the outside. The control device 9 adjusts the surface temperatures of the first heat exchanger 3 and the second heat exchanger 5 by operating the compressor 2 , adjusting the opening degree of the pressure reducer 4 , and the like.

[0032] The second heat exchanger 5 is provided in the adsorption flow path 10 at a position on the upstream side of the airflow relative to the position where the adsorbent material 1 is provided. The refrigeration cycle device is operated in such a manner that the second heat exchanger 5 functions as an evaporator, and the second heat exchanger 5 exchanges heat with the airflow of the adsorption flow path 10. The refrigeration cycle device selects the type and pressure of the refrigerant so that the surface temperature of the second heat exchanger 5 functioning as an evaporator is sufficiently lower than the temperature of the upstream airflow. The refrigeration cycle device cools the moisture (water vapor) contained in the airflow of the adsorption flow path 10 and condenses it into liquid water or solid frost attached to the surface of the second heat exchanger 5 to perform dehumidification.

[0033] If the flow velocity, temperature, humidity, etc. of the airflow flowing into the adsorption flow path 10 change little over time, it is not necessary to perform control based on the temperature and humidity of the airflow, so that the refrigeration cycle device can operate under certain conditions. However, in the case where the temperature and humidity of the airflow change, even if the airflow in the adsorption flow path 10 is cooled, if the temperature of the second heat exchanger 5 is not below the saturation temperature of the water vapor in the airflow, dehumidification may not be possible. Therefore, it is preferred that the control device 9 controls the operation of the compressor 2, the pressure reducer 4, etc. based on the temperature and humidity of the airflow upstream of the second heat exchanger 5, so that the refrigeration cycle device performs a dehumidification operation and the second heat exchanger 5 reaches an appropriate temperature.

[0034] Figure 1 The example in which the temperature sensor 41 and the humidity sensor 42 are provided on the upstream side of the second heat exchanger 5 in the air flow to measure the temperature and humidity of the air flow flowing into the adsorption flow path 10 is shown. In addition, the temperature sensor 41 and the humidity sensor 42 may not be provided in the adsorption flow path 10. In addition, when the temperature and humidity of the air flow flowing into the adsorption flow path 10 can be measured and estimated by other means, control may be performed based on this information. In addition, Figure 1 The temperature sensor 41 and the humidity sensor 42 are shown in FIG. 1 , but they may be omitted for simplicity in the following embodiments.

[0035] The second heat exchanger 5 uses, for example, a heat exchanger in which fins are installed on a heat transfer tube for the flow of refrigerant to increase the heat exchange area between the refrigerant and the air. The fins can be arranged at intervals so that the airflow of the adsorption flow path 10 flows from the upstream side to the downstream side, and the shape and structure are set so that the water attached to the surface of the fins can be easily drained under the action of gravity. For example, the second heat exchanger 5 can also be a round tube heat exchanger, a finless heat exchanger, etc. In addition, the second heat exchanger 5 is preferably a heat exchanger with fins formed with drainage holes. In particular, in a flat tube heat exchanger using corrugated fins, a louver slit can be formed to improve the contact with the airflow, and in addition to the louver slit, fins formed with drainage holes and drainage slits can be used. In addition, since the finless heat exchanger does not have fins to which water is easily attached, it has excellent drainage. The second heat exchanger 5 can also be set as a heat exchanger whose surface is made of a waterproof material such as a fluorine compound. The second heat exchanger 5 may also be configured such that the fins connected to the heat transfer tubes protrude from the heat transfer tubes toward the upstream side of the airflow, but do not protrude toward the downstream side of the airflow, or protrude less than the upstream side of the airflow. The second heat exchanger 5 is configured to cover the entire flow path cross section of the adsorption flow path 10 so as to be in contact with the entire airflow flowing in the adsorption flow path 10.

[0036] A drain pan 12 and a drain pipe 13 are connected to the lower part of the second heat exchanger 5. The drain pan 12 receives water flowing down from the second heat exchanger 5, and the drain pipe 13 discharges the water received by the drain pan 12 to the outside of the adsorption flow path 10. The drain pan 12 and the drain pipe 13 are drainage flow paths for discharging the water falling from the second heat exchanger 5 to the outside of the adsorption flow path 10.

[0037] The drain pan 12 preferably has a structure that prevents the falling water from flowing toward the adsorbent material 1 side. If water accumulates at a position downstream of the second heat exchanger 5, the water accumulated in the drain pan 12 may evaporate again due to the airflow of the adsorption flow path 10 and flow toward the adsorbent material 1 side, thereby reducing the dehumidification effect. Therefore, for example, as shown in the figure, the bottom of the drain pan 12 may be inclined or have a height difference so that the downstream side (adsorbent material 1 side) of the bottom of the drain pan 12 is high and the upwind side is low, so that the water falling from the second heat exchanger 5 flows toward the upstream side of the second heat exchanger 5 and accumulates. In addition, the upper part of the drain pan 12 downstream of the second heat exchanger 5 may be covered with a cover or the like not shown.

[0038] In addition, if water adheres to the adsorbent material 1, its performance will be significantly reduced, so the adsorbent material 1 is arranged at a distance from the second heat exchanger 5 so that the water attached to the second heat exchanger 5 does not adhere to the adsorbent material 1. The direction in which the adsorption flow path 10 extends is not particularly limited, but it is preferred that the second heat exchanger 5 is not directly above the adsorbent material 1 and is offset in the horizontal direction to prevent water from falling from the second heat exchanger 5 to the adsorbent material 1. In addition, in order to prevent the water blown off from the second heat exchanger 5 by the airflow from adhering to the adsorbent material 1, a shutter or the like may be provided between the second heat exchanger 5 and the adsorbent material 1.

[0039] Figure 2 This is a flowchart showing an example of control of a CO2 adsorption device. When the control is started, first, an airflow is generated in the adsorption flow path 10 by operating the blower 11, etc. (S1). In addition, if the adsorption flow path 10 is a flow path that always generates an airflow, the step S1 may be omitted. In addition, if the adsorption flow path 10 is a flow path that intermittently generates an airflow, the generation of the airflow may be confirmed as a step S1. Next, the temperature and humidity of the airflow flowing into the adsorption flow path 10 are measured (S2). Then, based on the temperature and humidity of the airflow upstream of the second heat exchanger obtained in the step S2, the control device 9 controls the operation of the refrigeration cycle device.

[0040] The control device 9 confirms whether the temperature and humidity of the airflow are within an effective range for dehumidification using the refrigeration cycle device (S3). In the case where the humidity is lower than a predetermined value (for example, the relative humidity is less than 20%) or the temperature is lower than a predetermined value, or in the case where the relationship between the temperature and the humidity does not satisfy a certain relationship, the dehumidification operation is not performed (S6). On the other hand, when the temperature and humidity are within an effective range, the dehumidification operation is performed. At this time, based on the values ​​of the temperature and humidity, the surface temperature of the second heat exchanger 5 is set to be lower than the temperature at which the water vapor of the airflow becomes saturated water vapor (S4). Even in the case of low humidity, dehumidification can be performed by significantly lowering the temperature of the second heat exchanger 5, but the amount of water that can be dehumidified is small relative to the power required by the refrigeration cycle device, and the dehumidification efficiency is low. In addition, in the case of low temperature, the amount of water contained in the airflow is also small, and the dehumidification efficiency is low. Under these conditions, even if dehumidification using the refrigeration cycle device is not performed, the adsorption capacity of the adsorbent 1 can be suppressed from decreasing due to the low humidity. In addition, since the refrigeration cycle device does not perform dehumidification operation under such conditions, energy is saved.

[0041] When the temperature and humidity of the airflow flowing into the adsorption flow path 10 are high, the water vapor in the airflow can be condensed to perform dehumidification. For example, when the temperature of the airflow flowing into the adsorption flow path 10 is sufficiently higher than 0°C (for example, 15°C or higher) and the humidity is high (for example, relative humidity is 50% or higher), the temperature of the second heat exchanger 5 can be set to, for example, 0°C to 5°C to perform dehumidification. On the other hand, when the temperature and humidity of the airflow are low, the water vapor in the airflow can be iced (frost) to perform dehumidification. For example, when the temperature of the airflow flowing into the adsorption flow path 10 is 5°C or lower or the relative humidity is less than 30%, the temperature of the second heat exchanger 5 can be set to a temperature lower than 0°C, for example, -10°C to -5°C, and the water vapor in the airflow can be attached to the second heat exchanger 5 as frost to perform dehumidification. In addition, when the temperature and humidity are in the middle range, it can be determined whether to perform dehumidification as condensed water or as frost based on a predetermined condition table.

[0042] The refrigeration cycle device performs dehumidification operation based on the operating conditions obtained in step S4 (S5). It is determined every unit time (e.g., 10 seconds) whether a signal for ending the adsorption operation is input from the outside during the dehumidification operation in step S5 or during the dehumidification operation stop in step S6 (S7). If it is determined in step S7 that an end instruction is input, the operation related to the dehumidification operation is stopped (S8) to end the adsorption operation. If no end instruction is input, the process returns to step S2 again, the temperature and humidity are measured, and then the operating conditions are reset as in S4 to S6.

[0043] Furthermore, in the dehumidification operation of step S5, when dehumidification is performed as frost attached to the second heat exchanger 5, when the frost attached to the second heat exchanger 5 increases, the air flow becomes difficult to flow, and therefore, the control device 9 causes the refrigeration cycle device to perform a defrosting operation for removing frost periodically. The defrosting operation usually increases the temperature of the second heat exchanger 5, melts the frost attached to the second heat exchanger 5, and causes it to fall as water. The defrosting operation may also stop the refrigeration cycle device and increase the temperature of the second heat exchanger 5. In addition, the air flow of the adsorption flow path 10 may be stopped during the dehumidification operation to prevent the water evaporated from the water flowing in the second heat exchanger 5 from flowing to the adsorbent material. In addition, in the case where the dehumidification operation is difficult, the dehumidification operation may be performed only under the condition of dehumidifying as condensed water.

[0044] As described above, the CO2 adsorption device of the present embodiment 1 uses the heat exchanger that functions as an evaporator of the refrigeration cycle device to dehumidify water vapor. In the structure that uses a moisture adsorbing material for dehumidification as in the prior art, the moisture and the moisture adsorbing material are strongly bonded, so the energy used for separation is large, which has problems in terms of energy saving. In the structure that uses the evaporator for cooling to perform dehumidification as in the present embodiment 1, the water generated by dehumidification is easy to discharge, which is excellent in preventing the reduction of CO2 adsorption capacity and energy saving. In addition, if there is a control device 9 that controls the operation of the refrigeration cycle device based on the temperature and humidity of the air flow upstream of the second heat exchanger 5, the energy required for dehumidification can be further suppressed.

[0045] The dehumidification structure of Embodiment 1 may be combined with a dehumidification structure using a moisture adsorbing material. If dehumidification is performed using a refrigeration cycle device upstream of the moisture adsorbing material, the moisture adsorbing material needs to absorb less water, and the energy required to regenerate the moisture adsorbing material can be reduced.

[0046] Figure 31 is a structural diagram of a CO2 adsorption device of a modified example of embodiment 1. In the CO2 adsorption device of this modified example, a stationary total heat exchanger 50 is provided at a position on the upstream side of the adsorption flow path 10 relative to the second heat exchanger 5. The total heat exchanger 50 is connected to the ventilation flow path 30, and the ventilation flow path 30 is used for an airflow different from the airflow flowing into the adsorption flow path 10. The total heat exchanger 50 performs total heat exchange between the airflow flowing into the adsorption flow path 10 and the airflow flowing in the ventilation flow path 30. A typical stationary total heat exchanger 50 has a structure in which independent flow paths separated by sheets are alternately stacked. The sheet has heat conductivity and moisture permeability, so that the total heat exchanger 50 can continuously perform sensible heat exchange and latent heat exchange of two airflows. Such a stationary total heat exchanger 50 does not require power, so energy-saving heat exchange can be achieved. By allowing an airflow with a lower humidity than the adsorption flow path 10 to flow in the ventilation flow path 30, the humidity of the airflow flowing into the adsorption flow path 10 can be reduced. Therefore, in the CO 2 adsorption device of the modified example, the dehumidification load by the second heat exchanger 5 is reduced, and energy is saved.

[0047] <Implementation method 2>

[0048] Figure 4 This is a structural diagram of a CO2 adsorption device of Embodiment 2. The CO2 adsorption device of Embodiment 2 sets the heat exchanger that functions as a condenser of the CO2 adsorption device of Embodiment 1 as a first heat exchanger 31 that performs heat exchange with water. Compared with a heat exchanger that performs heat exchange with a gas, a heat exchanger that performs heat exchange with water has good heat exchange performance and is easy to be miniaturized. Although a heat exchanger that performs heat exchange with water also requires the flow of water, the efficiency of heat exchange is high compared with that of gas. In addition, heat exchange using convection of water is also effective, so the energy used to make the fluid flow can be reduced. In addition, if combined with a device that uses water, the pressure of the water supply can be used to generate the flow of water, and electricity used to generate the water flow can be saved. In addition, in the present disclosure, a liquid whose main component is water is described as water regardless of whether it contains inorganic matter, organic matter, or non-dissolved matter dissolved in a flowable manner.

[0049] Figure 4 The CO2 adsorption device shown has a container 21 that can store water and allows water to flow in and out, and a first heat exchanger 31 is provided as a heat source for heating the water stored in the container 21. The first heat exchanger 31 is a heat exchanger that functions as a condenser during dehumidification operation as described as the first heat exchanger 3 in the above embodiment.

[0050] The first heat exchanger 31 may be a heat exchanger in which fins are attached to heat transfer pipes through which the refrigerant flows to increase the heat exchange area between the refrigerant and water. Alternatively, a heat exchanger may be constructed in which a refrigerant flow path and a water flow path are separated by a plate for heat exchange.

[0051] Although not essential, the container 21 may be a part of a hot water supply device for supplying hot water to a building. The container 21 is provided with an inlet 21a for cold water to flow in at the bottom, and an outlet 21b for heated water (hot water) to flow out at the top, and the first heat exchanger 31 is provided at the lower part of the container 21. The container 21 is filled with water. The cold water flowing in from the inlet 21a is heated by the first heat exchanger 31, becomes hot water and flows out from the outlet 21b. The water may be heated at a time when water does not flow in from the inlet 21a. In this case, the water in the container 21 is heated by convection caused by the heating by the first heat exchanger 31. In addition, if the container 21 has appropriate heat insulation, the heat of the heated water will not be immediately reduced, and heat can be stored as hot water. The heated water (hot water) flowing out of the container 21 can be used for hot water used in bathing, heating, etc. The water in the container 21 may also be used as other heating sources instead of being used directly as water.

[0052] In addition, as long as the first heat exchanger 31 dissipates heat to water during the dehumidification operation in which the second heat exchanger 5 functions as an evaporator, the heat dissipation of the first heat exchanger 31 does not necessarily have to be utilized during the dehumidification operation. For example, the refrigeration cycle device may also be provided with other heat exchangers (not shown) connected in parallel with the second heat exchanger 5 and switched to a structure in which any one of them functions as an evaporator, so that the heat dissipation of the first heat exchanger 31 is utilized when the other heat exchanger functions as an evaporator. In addition, similarly, the heat dissipation of the first heat exchanger 31 does not necessarily have to be utilized for heating water during the dehumidification operation of the second heat exchanger 5. For example, the refrigeration cycle device may also be provided with other heat exchangers (not shown) connected in parallel with the first heat exchanger 31 and switched to a structure in which the other heat exchangers function as condensers during the dehumidification operation of the second heat exchanger 5.

[0053] As described above, the CO2 adsorption device of the second embodiment sets the first heat exchanger 31 functioning as a condenser as a heat exchanger for heat exchange with water, so that the energy for causing the fluid for heat exchange with the refrigerant of the refrigeration cycle to flow can be suppressed, and energy can be saved. In addition, the hot water supply device for supplying hot water to the building is composed of the container 21 that can realize the inflow and outflow of water and store water, and the heat dissipated from the first heat exchanger 31 during the dehumidification operation can be effectively used, so that energy reduction is effective.

[0054] <Implementation method 3>

[0055] Figure 5 1 is a block diagram of a CO2 adsorption device according to Embodiment 3. The CO2 adsorption device according to Embodiment 3 is similar to Embodiment 2 in that a heat exchanger functioning as a condenser is set as a first heat exchanger 31 that exchanges heat with water. The condenser of the CO2 adsorption device according to Embodiment 3 exchanges heat with wastewater from a water utilization device 27.

[0056] The water utilization device 27 is, for example, a device that uses cooling water to cool a heat generating component, a water-using cleaning device, etc. The water that enters the water utilization device 27 from the water supply pipe 24 is drained through the drain pipe 25 after use. The first heat exchanger 31 can be a heat exchanger in which a refrigerant pipe is wound around the drain pipe 25 so as to exchange heat with the water in the drain pipe 25, a heat exchanger placed in a drain tank similar to the container of Embodiment 3, etc. The drain heated by the first heat exchanger 31 is guided to a drain treatment device outside the building.

[0057] The CO2 adsorption device of the fourth embodiment sets the first heat exchanger 31 functioning as a condenser as a heat exchanger for heat exchange with water, so that the energy for flowing the fluid for heat exchange with the refrigerant of the refrigeration cycle can be suppressed, and energy can be saved. In addition, since the flow of water is generated by utilizing the pressure of the water entering the water utilization device 27, the energy for flowing the water can be saved.

[0058] <Implementation method 4>

[0059] Figure 6 1 is a structural diagram of a CO2 adsorption device of Embodiment 5. The CO2 adsorption device of Embodiment 5 is in addition to the CO2 adsorption device of the above-mentioned embodiment, and further includes a temperature-raising heat exchanger 16 between the second heat exchanger 5 and the adsorption material 1, and the temperature-raising heat exchanger 16 allows a fluid having a temperature higher than that of the refrigerant flowing in the second heat exchanger 5 to flow. The temperature-raising heat exchanger 16 is located on the downstream side of the second heat exchanger 5 and the upstream side of the adsorption material 1 in the air flow of the adsorption flow path 10. The temperature-raising heat exchanger 16 exchanges heat between the air flow whose temperature is lowered when the second heat exchanger 5 is dehumidified and the fluid flowing inside the temperature-raising heat exchanger 16, and raises the temperature of the air flow that passes through the temperature-raising heat exchanger 16 and flows to the adsorption material 1.

[0060] The fluid flowing inside the temperature-raising heat exchanger 16 may be, for example, the water in the container 21 described in Embodiment 2, the drainage described in Embodiment 3, or a heat generating device, exhaust gas, etc., or may be a structure of the embodiment described later. In addition, the temperature-raising heat exchanger 16 preferably has a heat dissipation amount that increases the temperature of the airflow flowing to the adsorbent material 1 to the same level as the airflow flowing into the adsorption flow path 10. However, if the temperature of the airflow flowing to the adsorbent material 1 is too high, the adsorption performance of the adsorbent material 1 may be reduced. The temperature of the airflow flowing to the adsorbent material 1 may also be a temperature between the temperature of the airflow flowing into the adsorption flow path 10 and the temperature of the airflow immediately downstream of the second heat exchanger 5. Figure 6 The structure in which the water in the container 21 is heated by the first heat exchanger 31 functioning as a condenser is shown as in the second embodiment. Alternatively, the temperature of the airflow flowing to the adsorbent 1 can be appropriately increased by causing a part of the water in the container 21 to flow through the temperature increasing heat exchanger 16 .

[0061] The CO2 adsorption capacity of the adsorbent 1 is improved by lowering the temperature of the airflow, but the moisture absorption may also increase at the same time. Therefore, if the temperature of the airflow is increased, the relative humidity can be reduced and moisture absorption can be suppressed. As a result, moisture absorption of the adsorbent 1 can be prevented, and the adsorption capacity of CO2 relative to moisture absorption can be improved.

[0062] In addition, if the temperature of the airflow becomes low, the adsorbent material 1 also becomes low. If the adsorbent material 1 also remains low when the operation of CO2 adsorption is stopped, condensation may occur on the adsorbent material 1, causing the adsorbent material 1 to deteriorate. According to the CO2 adsorption device of the fifth embodiment, the temperature of the airflow cooled during dehumidification by the second heat exchanger 5 is increased by the temperature-increasing heat exchanger 16, so that the adsorption capacity of CO2 can be improved, and the deterioration of the adsorbent material 1 can be prevented.

[0063] <Implementation method 5>

[0064] Figure 71 is a structural diagram of a CO2 adsorption device of Embodiment 5. The CO2 adsorption device of Embodiment 5 is a structure in which the temperature-raising heat exchanger 16 of the CO2 adsorption device of Embodiment 4 is set as a heat exchanger 26 for performing heat exchange between the airflow to be adsorbed with CO2 and the airflow dehumidified by the second heat exchanger 5. The airflow to be adsorbed with CO2 is guided to the heat exchanger 26 by the flow path 34, and heat is exchanged with the airflow downstream of the second heat exchanger 5 through the heat exchanger 26. Then, the airflow flowing in from the flow path 34 and flowing through the heat exchanger 26 is guided to the upstream of the second heat exchanger 5 of the adsorption flow path 10 through the flow path 35. That is, the heat exchanger 26 performs heat exchange between the airflow upstream of the second heat exchanger 5 and the airflow downstream of the second heat exchanger 5. As the heat exchanger 26, for example, a heat exchanger in which the airflow downstream of the second heat exchanger 5 and the airflow passing through the inside of the heat exchanger 16 are separated by a thin plate can be used.

[0065] Since the heat exchanger 26 of Embodiment 5 is cooled by the airflow downstream of the second heat exchanger 5, condensation may occur inside the heat exchanger 16. The heat exchanger 16 may include a drainage path (not shown) for discharging condensed water generated inside to the outside.

[0066] According to the CO2 adsorption device of the fifth embodiment, the temperature of the airflow cooled when dehumidified by the second heat exchanger 5 is increased by the heat exchanger 26 as in the fourth embodiment, so that the CO2 adsorption capacity can be improved and the deterioration of the adsorbent material 1 can be prevented. In addition, the airflow guided to the inside of the heat exchanger 16 is generated by the airflow flowing in the adsorption flow path 10, so there is no need to provide a blower or the like, saving energy.

[0067] <Implementation method 6>

[0068] Figure 8 : This is a structural diagram of a CO2 adsorption device of Embodiment 6. The CO2 adsorption device of Embodiment 6 is a structure in which the temperature-raising heat exchanger 16 of Embodiment 4 is set as a third heat exchanger 6 for the flow of the refrigerant of the refrigeration cycle device. The third heat exchanger 6 is connected to the piping 8 between the first heat exchanger 31 and the second heat exchanger 5. In addition, a second pressure reducer 7 is provided between the third heat exchanger 6 and the second heat exchanger 5. In addition, the figure shows a structure in which the heat exchanger functioning as a condenser is a first heat exchanger 31 that performs heat exchange with water in the container 21, but the condenser may also be the first heat exchanger 3 that performs heat exchange with the airflow.

[0069] The refrigerant discharged from the compressor 2 and flowing through the third heat exchanger 6 via the first heat exchanger 31 is decompressed by the second decompressor 7 and flows to the second heat exchanger 5. If the pressure of the refrigerant flowing through the third heat exchanger 6 is maintained higher than that of the second heat exchanger 5 by the second decompressor 7, the temperature of the third heat exchanger 6 can be made higher than that of the second heat exchanger 5. As a result, the airflow having a low temperature after flowing through the second heat exchanger 5 can be heated by the third heat exchanger 6 and flows to the adsorbent material 1.

[0070] By setting such a structure, the third heat exchanger 6 functions as a condenser and can heat the airflow using the heat when the refrigerant condenses. In addition, even if the refrigerant does not condense, it is at a higher temperature than the second heat exchanger 5, so the airflow that flows through the second heat exchanger 5 and becomes low temperature can be heated.

[0071] In addition, if the second pressure reducer 7 is set to a structure in which the opening of the valve that allows the refrigerant to flow is variable or a structure that can switch between a flow path with a reduced opening and a flow path with a non-reduced opening, the temperature of the third heat exchanger 6 can be adjusted, which is preferred. If it is configured in this way, the third heat exchanger 6 can be used as an evaporator for dehumidification in the same way as the second heat exchanger 5 without reducing the pressure by the second pressure reducer 7. The refrigeration cycle device can also be controlled by adjusting the pressure reduction of the second pressure reducer 7 according to the temperature and humidity of the airflow, so as to switch whether to make the third heat exchanger 6 low temperature for the purpose of dehumidification or to use the third heat exchanger 6 for heating the airflow dehumidified by the second heat exchanger 5.

[0072] According to the CO2 adsorption device of the sixth embodiment, the temperature of the airflow cooled during dehumidification by the second heat exchanger 5 is increased by the third heat exchanger 6, similarly to the fourth embodiment, so that the CO2 adsorption capacity can be improved and the deterioration of the adsorbent material 1 can be prevented. In addition, the temperature of the third heat exchanger 6 can be adjusted by the second pressure reducer 7, so the function of the third heat exchanger 6 can be changed according to the situation.

[0073] <Implementation method 7>

[0074] Fig. 9 1 is a structural diagram of a CO2 adsorption device of Embodiment 7. The CO2 adsorption device of Embodiment 7 is provided with a switching valve 14 for switching the flow of the refrigerant of the refrigeration cycle device. The switching valve 14 switches the flow direction of the refrigerant of the refrigeration cycle device so that the function of the first heat exchanger 3 and the function of the second heat exchanger 5 are switched between the condenser and the evaporator. In addition, in this Embodiment 7, the first heat exchanger 3 is composed of a first heat exchanger 31a and a first heat exchanger 31b. In the figure, the switching valve 14 is described as a four-way valve, but it can also be replaced by a structure in which a plurality of valves are combined.

[0075] The first heat exchanger 31a is connected in parallel with the first heat exchanger 31b, and the refrigerant flow path is configured to flow through the first heat exchanger 31a when it functions as a condenser, and to flow through the first heat exchanger 31b when it functions as an evaporator. As an example, the figure shows a structure in which the refrigerant flow path uses check valves 15a and 15b. The path between the switching valve 14 and the pressure reducer 4 is divided into a path flowing through the first heat exchanger 31a and a path flowing through the first heat exchanger 31b. A check valve 15a is provided in the path flowing through the first heat exchanger 31a, which allows the refrigerant discharged from the compressor 2 to flow from the switching valve 14 to the pressure reducer 4 and prevents reverse flow. A check valve 15b is provided in the path flowing through the first heat exchanger 31b, which allows the refrigerant to flow from the pressure reducer 4 to the switching valve 14 and prevents reverse flow. The refrigerant flow path can also be composed of an open-close valve instead of the check valves 15a and 15b.

[0076] The heat dissipated from the first heat exchanger 31a functioning as a condenser is utilized for supplying hot water, etc., similarly to Embodiment 2. The heat supplied to the first heat exchanger 31b functioning as an evaporator is provided by drainage, similarly to Embodiment 3. By dividing the first heat exchanger 31a through which the refrigerant flows when functioning as a condenser and the first heat exchanger 31b through which the refrigerant flows when functioning as an evaporator, the heat dissipated from the first heat exchanger 31a can be efficiently utilized.

[0077] Next, the operation of Embodiment 7 will be briefly described. As in Embodiment 1, when performing the adsorption operation of CO2 adsorption, the switching valve 14 is basically set so that the second heat exchanger 5 becomes an evaporator. The control device 9 makes the second heat exchanger 5 function as an evaporator and makes the surface temperature of the second heat exchanger 5 reach below the freezing point, and performs a dehumidification operation in which water vapor contained in the airflow is attached to the second heat exchanger 5 as frost. After making the refrigeration cycle device perform the dehumidification operation for an appropriate time, the control device 9 makes it perform a defrosting operation to remove the frost attached to the second heat exchanger 5. The control device 9 switches the switching valve 14 so that the second heat exchanger 5 functions as a condenser to remove the frost attached to the second heat exchanger 5. By functioning as a condenser, the second heat exchanger 5 becomes high temperature, the frost is quickly removed, and the CO2 adsorption operation can be performed well again. In addition, the blower 11 can be stopped when performing the defrosting operation.

[0078] In addition, the control device 9 may also make the second heat exchanger 5 function as a condenser after the dehumidification operation in which the second heat exchanger 5 functions as an evaporator is completed, and perform a temperature increase operation in which the temperature of the adsorbent 1 cooled by the dehumidification operation is increased. At this time, the airflow is not allowed to flow while frost or water is attached to the surface of the second heat exchanger 5, and the airflow is allowed to flow toward the adsorbent 1 after the surface temperature of the second heat exchanger 5 reaches a temperature that can sufficiently increase the temperature of the airflow in the adsorption flow path 10. In addition, the temperature of the second heat exchanger 5 is adjusted so that the temperature of the adsorbent 1 becomes a temperature sufficiently lower than the temperature for desorbing CO2 from the adsorbent 1. The adsorbent 1 cooled during the dehumidification operation is increased in temperature by the increased temperature airflow. In addition, under the condition that the amount of water vapor contained in the airflow is large, even when the increased temperature airflow is used, condensation may form on the surface of the adsorbent 1, so the humidity of the airflow may be confirmed by the humidity sensor 42, and the temperature increase operation may be performed when the humidity of the airflow is confirmed to be less than a predetermined humidity.

[0079] When such a temperature increase operation is not performed, after the dehumidification operation is completed, the adsorbent 1 exchanges heat with the surrounding air and the temperature gradually approaches the temperature of the surrounding air. However, if the humidity of the surrounding air changes, condensation may occur on the surface of the adsorbent 1, thereby degrading the adsorbent 1. Since the temperature of the adsorbent 1 is increased by using the heated airflow, condensation and deterioration can be prevented.

[0080] Fig. 9 The configuration shown is that a temperature sensor 43 is provided downstream of the adsorbent 1 in addition to the temperature sensor 41 upstream of the adsorbent 1. The control device 9 may adjust the air volume of the temperature raising operation or terminate the temperature raising operation based on the temperature downstream of the adsorbent 1.

[0081] in addition, Fig. 9The CO2 adsorption device shown is provided with a baffle 19 between the second heat exchanger 5 and the adsorption material 1. The baffle 19 is a movable shielding member that switches to allow or prevent the airflow from the second heat exchanger 5 to the adsorption material 1. The baffle 19 can be opened and closed by the rotation of the rotating shaft by installing a shielding plate on the rotating shaft, or can be opened and closed by sliding the shielding plate. The baffle 19 is opened when the second heat exchanger 5 functions as an evaporator to allow the airflow to flow to the adsorption material 1 through the second heat exchanger 5, and is closed when the second heat exchanger 5 does not function as an evaporator to prevent the airflow from flowing to the adsorption material 1 through the second heat exchanger. When the second heat exchanger 5 does not function as an evaporator, it means when the second heat exchanger 5 functions as a condenser or when the refrigeration cycle device is stopped. When the surface of the second heat exchanger 5 is dry, it can function as a condenser, but when it functions as a condenser in a state where water is attached, water vapor is generated. If the water vapor flows to the adsorption material 1, the performance of the adsorption material 1 may be reduced. In addition, when the refrigeration cycle device is stopped, if a high-humidity airflow flows in the adsorption flow path 10, the performance of the adsorbent material 1 may be reduced. Therefore, by closing the damper 19, the high-humidity airflow is prevented from flowing to the adsorbent material 1. In addition, even in the case where the switching valve 14 for switching the flow of the refrigerant of the refrigeration cycle device is not provided as in Embodiment 1, the airflow can be prevented from flowing when the refrigeration cycle device is stopped by a shield.

[0082] <Implementation method 8>

[0083] Fig.10 This is a structural diagram of a CO2 adsorption device of Embodiment 8. The CO2 adsorption device of Embodiment 8 is a structure in which the second heat exchanger 5 provided in the adsorption flow path 10 is divided into a plurality of parts. In the CO2 adsorption device of Embodiment 8, the area where the airflow of the adsorption flow path 10 flows is divided into a plurality of parts, and the second heat exchanger 5 is divided into a plurality of parts in such a manner that the divided areas respectively have second heat exchangers 5a and 5b. The figure shows an example in which the adsorption flow path 10 and the second heat exchanger 5 are divided into two parts in a direction perpendicular to the airflow, but the adsorption flow path 10 and the second heat exchanger 5 may be divided into three or more parts.

[0084] In addition, the refrigeration cycle device has a refrigerant flow path that switches the flow of the refrigerant so that when any one of the divided second heat exchangers 5a and 5b functions as an evaporator, the other divided second heat exchangers 5a and 5b do not function as evaporators. That is, it is configured to be able to change the flow of the refrigerant independently in the second heat exchangers 5a and 5b. The figure shows an example in which the refrigerant flow path is composed of a pipe and an on-off valve 17a, 17b, 17c, and 17d arranged on the pipe. The pipe is provided with a second pressure reducer 7 in the middle of the pipe connected in series with the second heat exchangers 5a and 5b, and is connected so that the refrigerant passing through the condenser can be selected to enter from any one of the second heat exchangers 5a and 5b and exit from the other. The refrigeration cycle device reduces the opening of the second pressure reducer 7 so that any one of the second heat exchangers 5a and 5b functions as a condenser and the other functions as an evaporator. With this structure, any one of the second heat exchangers 5a and 5b functions as an evaporator for dehumidification, while any other second heat exchanger 5a and 5b can be defrosted. In addition, the figure shows a situation where the on-off valves 17a and 17d are closed and the on-off valves 17b and 17c are opened, so that the refrigerant flowing into the second heat exchanger 5b is condensed, the refrigerant is depressurized by the second pressure reducer 7, and enters the second heat exchanger 5a to evaporate. When the frost on the second heat exchanger 5a increases, the refrigeration cycle device switches the opening and closing of the valves to open the on-off valves 17a and 17d and close the on-off valves 17b and 17c. This time, the second heat exchanger 5b is used for dehumidification, and the other second heat exchanger 5a is defrosted. In this way, according to this structure, any one of the second heat exchangers 5 can be frosted and used for dehumidification at all times, so that excellent dehumidification can be continuously performed without stopping. As a result, the CO2 adsorption performance is improved.

[0085] In addition, according to the structure in the figure, by opening the second pressure reducer 7 (not reducing pressure), both the second heat exchangers 5a and 5b can function as evaporators. In the dehumidification operation in which frost does not adhere to the second heat exchangers 5a and 5b, defrosting is not required, and all the second heat exchangers 5a and 5b after division are made evaporators, so the dehumidification performance is excellent.

[0086] In addition to the structure in the figure, the refrigerant flow path can also be configured such as connecting the second heat exchangers 5a and 5b in parallel so that the refrigerant flows in only one or both of them to function as an evaporator. Although the performance in the defrosting operation is worse than the structure in the figure, the structure is simple, the cost can be reduced, and the control becomes easy.

[0087] In addition, the CO2 adsorption device is provided with baffles 19a and 19b for adjusting the airflow passing through the divided plurality of second heat exchangers 5a and 5b in the adsorption flow path 10. The baffles 19a and 19b are basically the same as the baffle 19 described in Embodiment 7. The baffles 19a and 19b are opened when the corresponding second heat exchangers 5a and 5b are used as evaporators for dehumidification, and are closed when they do not function as evaporators, so as to prevent the airflow with high humidity from flowing to the adsorption material 1. Thus, it is possible to prevent the performance of the adsorption material 1 from being degraded.

[0088] <Implementation method 9>

[0089] Fig.11 1 is a block diagram of a CO2 adsorption device according to Embodiment 9. The CO2 adsorption device according to Embodiment 9 uses the first heat exchanger 3 functioning as a condenser of the CO2 adsorption device according to Embodiment 1 as a heat source for desorbing CO2 from the adsorbent. When the second heat exchanger 5 functions as an evaporator to perform dehumidification, the first heat exchanger 3 functions as a condenser to dissipate heat.

[0090] The CO2 adsorption device heats the solid adsorbent 1 that has adsorbed CO2 in the airflow to desorb CO2 from the adsorbent 1b. The adsorbent 1b that has adsorbed CO2 is set in a desorption flow path 20 such as a pipeline, and the desorption flow path 20 generates an airflow through the blower 11b. The white arrows in the figure indicate the flow of the airflow. In addition, if the desorption flow path 20 generates an airflow, it is not necessary to have the blower 11b. In addition, the blower 11b can be set on either the upstream side or the downstream side of the adsorbent 1b.

[0091] The first heat exchanger 3 is disposed on the upstream side of the adsorbent material 1b to be desorbed CO2 in the air flow in the desorption flow path 20, and performs heat exchange with the air flow in the desorption flow path 20. The first heat exchanger 3 is, for example, a heat exchanger in which fins are installed on a heat transfer tube to increase the heat exchange area between the heat transfer tube through which the refrigerant flows and the air. The first heat exchanger 3 heats the air flow in the desorption flow path 20 when functioning as a condenser. By heating the air flow, the adsorbent material 1b is heated to a high temperature to desorb the adsorbed CO2. In addition, when the heating by the first heat exchanger 3 alone cannot reach a temperature sufficient to desorb CO2, it can also be used in combination with other heat sources.

[0092] In addition, as long as the structure can utilize the heat dissipated by the first heat exchanger 3 during the dehumidification operation in which the second heat exchanger 5 functions as an evaporator, it is not necessary to utilize the heat dissipated by the first heat exchanger 3 during the dehumidification operation. For example, the refrigeration cycle device may also be a structure that includes other heat exchangers (not shown) connected in parallel with the second heat exchanger 5 and switches to any one of them to function as an evaporator. In addition, similarly, it is not necessary to utilize the heat dissipated by the first heat exchanger 3 for desorption of CO2 during the dehumidification operation of the second heat exchanger 5. For example, the refrigeration cycle device may also be a structure that includes other heat exchangers (not shown) connected in parallel with the first heat exchanger 3 and switches to any one of them to function as a condenser.

[0093] Even if CO2 is desorbed, if the adsorbent 1b adsorbs moisture, the CO2 adsorption performance may be reduced. Therefore, the humidity of the airflow flowing into the desorption flow path 20 is preferably lower than the humidity of the airflow flowing into the adsorption flow path 10. For example, the CO2 adsorption device may be configured so that the airflow on the downstream side of the adsorption flow path 10 flows into the desorption flow path 20.

[0094] As described above, the CO 2 adsorption device of the second embodiment uses the heat of the first heat exchanger 3 functioning as a condenser as a heat source for desorbing CO 2 from the adsorbent 1 b that adsorbed CO 2 , and therefore can effectively utilize the energy for dehumidification.

[0095] As mentioned above, although the preferred embodiment etc. were described, it is not limited to the said embodiment etc., Various deformation|transformation and substitution can be added to the said embodiment etc. without departing from the scope described in a claim.

[0096] Hereinafter, each aspect of the present disclosure is collectively described as a supplementary note.

[0097] (Note 1)

[0098] A CO2 adsorption device is provided, wherein a solid adsorption material for adsorbing CO2 is arranged in a flow path for gas flow, wherein the CO2 adsorption device comprises:

[0099] A refrigeration cycle device that circulates a refrigerant through a compressor, a first heat exchanger, a pressure reducer, and a second heat exchanger; and a control device that controls the operation of the refrigeration cycle device.

[0100] The second heat exchanger is disposed in the flow path at a position upstream of the position where the adsorbent material is disposed.

[0101] During the adsorption operation for adsorbing CO 2 , the refrigeration cycle device causes the second heat exchanger to function as an evaporator to perform a dehumidification operation for causing moisture contained in the air flow to adhere to the surface of the second heat exchanger.

[0102] A drainage flow path for discharging water dropped from the second heat exchanger to the outside of the flow path is provided at a lower portion of the second heat exchanger.

[0103] (Note 2)

[0104] In the CO 2 adsorption device according to Supplementary Note 1, the control device controls the operation of the refrigeration cycle device based on the temperature and humidity of the airflow upstream of the second heat exchanger.

[0105] (Note 3)

[0106] In the CO 2 adsorption device according to Supplementary Note 1 or 2, a total heat exchanger for performing total heat exchange between the airflow flowing in the flow path and other airflow is provided upstream of the second heat exchanger in the flow path.

[0107] (Note 4)

[0108] In the CO 2 adsorption device according to any one of Supplementary Notes 1 to 3, the second heat exchanger is a heat exchanger having fins formed with drainage holes or drainage slits, or a finless heat exchanger.

[0109] (Note 5)

[0110] In the CO 2 adsorption device according to any one of Supplementary Notes 1 to 4, the first heat exchanger is a heat exchanger for performing heat exchange with water.

[0111] (Note 6)

[0112] The CO 2 adsorption device according to Supplementary Note 5 further includes a hot water supply device for supplying hot water into a building, and the first heat exchanger heats water in the hot water supply device when functioning as a condenser.

[0113] (Note 7)

[0114] In the CO 2 adsorption device described in Supplementary Note 5, a water utilization facility utilizing water is further provided in the building, and the first heat exchanger performs heat exchange with wastewater discharged after being utilized in the water utilization facility.

[0115] (Note 8)

[0116] In the CO2 adsorption device according to any one of Supplementary Notes 1 to 7, the refrigeration cycle device further includes a temperature-raising heat exchanger through which a fluid having a higher temperature than that of the second heat exchanger flows,

[0117] The temperature-increasing heat exchanger is arranged between the adsorbent material and the second heat exchanger,

[0118] The airflow having a temperature reduced by passing through the second heat exchanger is heated by passing through the heating heat exchanger.

[0119] (Note 9)

[0120] In the CO 2 adsorption device described in Supplementary Note 8, the temperature-raising heat exchanger is a heat exchanger that performs heat exchange between the airflow upstream of the second heat exchanger and the airflow downstream of the second heat exchanger.

[0121] (Note 10)

[0122] In the CO2 adsorption device described in Supplementary Note 8, the temperature-raising heat exchanger is a third heat exchanger through which the refrigerant of the refrigeration cycle device flows,

[0123] The refrigeration cycle device further includes a second decompressor connected so that the refrigerant flowing through the third heat exchanger during the dehumidification operation is decompressed by the second decompressor and then flows to the second heat exchanger.

[0124] (Note 11)

[0125] In any one of Appendixes 1 to 10, a switching valve is provided, which switches the flow direction of the refrigerant in the refrigeration cycle device so that the function of the first heat exchanger and the function of the second heat exchanger are switched between the condenser and the evaporator.

[0126] (Note 12)

[0127] In the CO2 adsorption device described in Supplementary Note 11, the control device causes the second heat exchanger to function as a condenser after the dehumidification operation in which the second heat exchanger functions as an evaporator is completed, and performs a temperature increase operation to increase the temperature of the adsorption material cooled by the dehumidification operation.

[0128] (Note 13)

[0129] In the CO2 adsorption device described in Note 11, the control device makes the surface temperature of the second heat exchanger reach below the freezing point when the second heat exchanger functions as an evaporator to perform the dehumidification operation so that the water vapor contained in the air flow adheres to the second heat exchanger as frost, and then makes the second heat exchanger function as a condenser to perform the defrost operation to remove the frost attached to the second heat exchanger.

[0130] (Note 14)

[0131] In any one of the CO2 adsorption devices described in Notes 1 to 13, there is also a movable shielding member, which allows the airflow to pass through the second heat exchanger when the second heat exchanger functions as the evaporator, and prevents the airflow from passing through the second heat exchanger when the second heat exchanger does not function as the evaporator.

[0132] (Note 15)

[0133] In the CO2 adsorption device described in any one of Notes 1 to 13, the area where the airflow of the flow path flows is divided into multiple areas, and the second heat exchanger is divided into multiple areas in a manner such that the second heat exchanger is provided in each of the divided areas, and the refrigerant flow path is capable of switching the flow of the refrigerant so that when any one of the divided second heat exchangers functions as an evaporator, the other divided second heat exchangers do not function as an evaporator.

[0134] (Note 16)

[0135] In the CO2 adsorption device according to any one of Supplementary Notes 1 to 15,

[0136] The first heat exchanger is composed of heat exchangers connected in parallel,

[0137] A switching valve is provided, the switching valve switches the flow direction of the refrigerant in the refrigeration cycle device so that the function of the first heat exchanger and the function of the second heat exchanger are switched between a condenser and an evaporator,

[0138] A refrigerant flow path is provided for switching the flow of the refrigerant so that the refrigerant flows through any one of the heat exchangers connected in parallel when the second heat exchanger functions as an evaporator and flows through the other heat exchangers connected in parallel when the second heat exchanger functions as a condenser.

[0139] (Note 17)

[0140] In the CO 2 adsorption device according to any one of Supplementary Notes 1 to 16, heat released when the first heat exchanger functions as a condenser is used as a heat source for desorbing CO 2 from the adsorbent material that has adsorbed CO 2 .

[0141] Industrial Applicability

[0142] The CO 2 adsorption device disclosed in the present invention is excellent in energy saving.

[0143] Description of Reference Numerals

[0144] 1. 1b Adsorption material,

[0145] 2 compressors,

[0146] 3, 31, 31a, 31b a first heat exchanger,

[0147] 4 pressure reducers,

[0148] 5. 5a, 5b second heat exchanger,

[0149] 6. Third heat exchanger

[0150] 7 Second pressure reducer,

[0151] 8 piping,

[0152] 9 control device,

[0153] 10 adsorption flow path,

[0154] 11, 11b blower,

[0155] 12 Drain pan,

[0156] 13 Drain pipe,

[0157] 14 Switching valve,

[0158] 15a, 15b check valve,

[0159] 16, 26 heating heat exchanger,

[0160] 17a, 17b, 17c, 17d opening and closing valves,

[0161] 19, 19a, 19b baffles,

[0162] 20 Desorption flow path,

[0163] 21 containers,

[0164] 21a Inlet,

[0165] 21b outflow,

[0166] 24 water supply pipes,

[0167] 25 Drain pipe,

[0168] 27 Water utilization equipment,

[0169] 30 air flow path,

[0170] 34, 35 flow path,

[0171] 41, 43 temperature sensor,

[0172] 42 humidity sensors,

[0173] 50 Total heat exchanger.

Claims

1. A CO2 adsorption device, wherein a solid adsorption material for adsorbing CO2 is arranged in a flow path for gas flow, wherein: The CO2 adsorption device comprises: A refrigeration cycle device that circulates a refrigerant through a compressor, a first heat exchanger, a pressure reducer, and a second heat exchanger; and a control device that controls the operation of the refrigeration cycle device. The second heat exchanger is disposed in the flow path at a position upstream of the position where the adsorbent material is disposed. During the adsorption operation for adsorbing CO 2 , the refrigeration cycle device causes the second heat exchanger to function as an evaporator to perform a dehumidification operation for causing moisture contained in the air flow to adhere to the surface of the second heat exchanger. A drainage flow path for discharging water dropped from the second heat exchanger to the outside of the flow path is provided at a lower portion of the second heat exchanger.

2. The CO2 adsorption device according to claim 1, wherein: The control device controls the operation of the refrigeration cycle device based on the temperature and humidity of the airflow upstream of the second heat exchanger.

3. The CO2 adsorption device according to claim 1 or 2, wherein: A total heat exchanger for performing total heat exchange between the airflow flowing in the flow path and another airflow is provided upstream of the second heat exchanger in the flow path.

4. The CO2 adsorption device according to any one of claims 1 to 3, wherein The second heat exchanger is a heat exchanger having fins formed with drainage holes or drainage slits, or a finless heat exchanger.

5. The CO2 adsorption device according to any one of claims 1 to 4, wherein: The first heat exchanger is a heat exchanger that performs heat exchange with water.

6. The CO2 adsorption device according to claim 5, wherein: The building further includes a water heater for supplying hot water into the building, and the first heat exchanger heats water in the water heater when functioning as a condenser.

7. The CO2 adsorption device according to claim 5, wherein: A water utilization facility utilizing water is further provided in the building, and the first heat exchanger performs heat exchange with wastewater discharged after being utilized in the water utilization facility.

8. The CO2 adsorption device according to any one of claims 1 to 7, wherein The refrigeration cycle device further includes a temperature-increasing heat exchanger through which a fluid having a higher temperature than the second heat exchanger flows. The temperature-increasing heat exchanger is arranged between the adsorbent material and the second heat exchanger, The airflow having passed through the second heat exchanger and having its temperature lowered is passed through the temperature-raising heat exchanger and has its temperature raised.

9. The CO2 adsorption device according to claim 8, wherein: The temperature-raising heat exchanger is a heat exchanger that performs heat exchange between the airflow upstream of the second heat exchanger and the airflow downstream of the second heat exchanger.

10. The CO2 adsorption device according to claim 8, wherein: The temperature-increasing heat exchanger is a third heat exchanger through which the refrigerant of the refrigeration cycle device flows. The refrigeration cycle device further includes a second decompressor connected so that the refrigerant flowing through the third heat exchanger during the dehumidification operation is decompressed by the second decompressor and then flows to the second heat exchanger.

11. The CO2 adsorption device according to any one of claims 1 to 10, wherein: A switching valve is provided for switching the flow direction of the refrigerant in the refrigeration cycle device so that the function of the first heat exchanger and the function of the second heat exchanger are switched between a condenser and an evaporator.

12. The CO2 adsorption device according to claim 11, wherein: The control device causes the second heat exchanger to function as a condenser after the dehumidification operation in which the second heat exchanger functions as an evaporator is terminated, and performs a temperature raising operation in which the temperature of the adsorbent material lowered by the dehumidification operation is raised.

13. The CO2 adsorption device according to claim 11, wherein: The control device causes the surface temperature of the second heat exchanger to reach below freezing point when the second heat exchanger functions as an evaporator to perform the dehumidification operation so that water vapor contained in the air flow adheres to the second heat exchanger as frost, and then causes the second heat exchanger to function as a condenser to perform a defrost operation to remove frost adhered to the second heat exchanger.

14. The CO2 adsorption device according to any one of claims 1 to 13, wherein: A movable shield is further provided, the shield allowing the airflow to pass through the second heat exchanger when the second heat exchanger functions as the evaporator, and preventing the airflow from passing through the second heat exchanger when the second heat exchanger does not function as the evaporator.

15. The CO2 adsorption device according to any one of claims 1 to 13, wherein: The flow path is divided into a plurality of areas where the airflow flows, and the second heat exchanger is divided into a plurality of areas in such a manner that the second heat exchanger is provided in each of the divided areas, and has a refrigerant flow path that switches the flow of the refrigerant to a refrigerant flow path in which, when any one of the divided second heat exchangers functions as an evaporator, the other divided second heat exchangers do not function as an evaporator.

16. The CO2 adsorption device according to any one of claims 1 to 15, wherein: The first heat exchanger is composed of heat exchangers connected in parallel, A switching valve is provided, the switching valve switches the flow direction of the refrigerant in the refrigeration cycle device so that the function of the first heat exchanger and the function of the second heat exchanger are switched between a condenser and an evaporator, A refrigerant flow path is provided for switching the flow of the refrigerant so that the refrigerant flows through any one of the heat exchangers connected in parallel when the second heat exchanger functions as an evaporator and flows through the other heat exchangers connected in parallel when the second heat exchanger functions as a condenser.

17. The CO2 adsorption device according to any one of claims 1 to 16, wherein: The heat released when the first heat exchanger functions as a condenser is used as a heat source for desorbing CO 2 from the adsorbent material that has adsorbed CO 2 .

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