Gas recovery apparatus, building air-conditioning system, and gas recovery method

Abstract

To provide a gas recovery apparatus, a building air-conditioning system, and a gas recovery method which suppress vibration and noise.SOLUTION: A gas recovery apparatus 1 includes an air supply part 10, an adsorption part 20, a decompression part 30, a vapor supply part 40, and a recovery part 50. The air supply part 10, the decompression part 30 and the recovery part 50 are connected to the adsorption part 20. The vapor supply part 40 is connected to the decompression part 30. The air supply part 10 supplies treatment target air containing gas as an adsorption target to the adsorption part 20. The adsorption part 20 has an adsorbent having gas adsorption capability. After water vapor is supplied to the decompression part 30 from the vapor supply part 40, heat is discharged from the decompression part 30 in a state in which a third valve B3, a fourth valve B4 and a fifth valve B5 are closed, thereby the water vapor in the decompression part 30 is aggregated and converted into water. The water decompresses the decompression part 30. The inside of the decompression part 30 is decompressed, and then the fifth valve B5 is opened, so that the gas adsorbed to the adsorption part 20 is diffused into the decompression part 30 from the adsorption part 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a gas recovery device, a building air conditioning system, and a gas recovery method. [Background technology]

[0002] There are three types of thermal loads in air conditioning: the exterior load, which occurs when external heat is transferred from the exterior of a structure, etc.; the indoor load, which occurs inside the room, such as heat from the human body and lighting; and the outdoor load, which occurs when outside air is taken in. In a typical building, the outdoor load is said to account for 30% of the above thermal load.

[0003] It is known that the importance of both technologies that seek to reduce emissions and absorb (negative emission) of carbon dioxide (hereinafter referred to as "CO2"), a greenhouse gas, is key to achieving carbon neutrality. One negative emission technology that has attracted attention is so-called Direct Air Capture (DAC), which directly captures CO2 that has been dispersed into the atmosphere. DAC is also one of the requirements in Moonshot Goal 4, which has been promoted since fiscal 2020.

[0004] In existing office buildings, etc., the amount of outside air introduced is controlled with an upper limit of 1000 ppm (volume basis; the same applies hereinafter in this specification) for CO2 concentration, as stipulated in the Building Standards Act, Building Management Act, etc. DAC, which recovers CO2 from indoors where the CO2 concentration ranges from 400 ppm to 1000 ppm by introducing outside air, is more efficient than DAC that only uses outside air.

[0005] Apart from membrane separation, other known methods for separating and capturing CO2 include the Thermal Swing Adsorption (TSA) method, which alternates between room temperature adsorption and high temperature desorption (see, for example, Patent Document 1), and the Pressure Swing Adsorption (PSA) method, which alternates between high pressure adsorption and low pressure desorption (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-044504 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-167629 Summary of the Invention [Problem to be solved by the invention]

[0007] Generally, PSA systems require a compressor. The PSA system generates compressor vibrations and noise when these vibrations are transmitted to the building. This makes the PSA system unsuitable for applications where the living environment is important, such as office buildings and homes.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas recovery device, a building air conditioning system, and a gas recovery method that suppress vibration and noise. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention has the following aspects. [1] An apparatus including an air supply unit, an adsorption unit, a pressure reduction unit, a steam supply unit, and a recovery unit; the air supply unit and the pressure reduction unit are connected to the adsorption unit, the steam supply unit is connected to the pressure reducing unit, a first valve is provided in a first pipe connecting the air supply unit and the adsorption unit; a second valve is provided in a second pipe that discharges residual gas that has not been adsorbed by the adsorption unit from the adsorption unit; a third valve is provided on a third pipe connecting the pressure reducing section and the steam supply section; a fourth valve is provided in a fourth pipe connecting the pressure reducing section and the recovery section; a fifth valve is provided in a fifth pipe connecting the adsorption unit and the pressure reduction unit; the air supply unit supplies air to be treated containing a gas to be adsorbed to the adsorption unit; the adsorption section has an adsorbent having gas adsorption ability, After supplying water vapor from the steam supply unit to the pressure reduction unit, the third valve, the fourth valve, and the fifth valve are closed, and heat is released from the pressure reduction unit to condense the water vapor in the pressure reduction unit into water, thereby reducing the pressure inside the pressure reduction unit; a gas recovery device in which, after the pressure inside the pressure reducing section is reduced, the fifth valve is opened to cause the gas adsorbed by the adsorption section to diffuse from the adsorption section into the pressure reducing section. [2] The gas recovery device described in [1], wherein after the gas adsorbed in the adsorption section is diffused from the adsorption section into the pressure reduction section, the fifth valve is closed, the third valve and the fourth valve are opened, steam is supplied from the steam supply section to the pressure reduction section, and the gas, steam, and water in the pressure reduction section are discharged to the recovery section. [3] A cooling section is provided in the fourth pipe at a downstream side of the fourth valve, the recovery section has a gas-liquid separation trap, The gas, the water vapor, and the water discharged from the pressure reducing section are cooled in the cooling section, The gas recovery device according to [1] or [2], wherein the gas-liquid separation trap captures moisture and recovers gas. [4] An air supply unit, an adsorption unit, a steam driving unit, and a steam supply unit; the air supply is connected to the steam drive; the steam supply is connected to the steam drive; a first valve in a first pipe connecting the air supply unit and the steam driving unit; a second valve is provided in a second pipe connecting the vapor driving unit and the adsorption unit; a third valve in a third pipe connecting the steam supply unit and the steam driving unit; a fourth pipe for discharging residual gas that has not been adsorbed by the adsorption unit from the adsorption unit, the fourth pipe having a fourth valve or a pressure regulating valve; the air supply unit supplies, to the vapor drive unit, air to be treated that contains a gas to be adsorbed in the adsorption unit; the adsorption section has an adsorbent having gas adsorption ability, a piston of the steam driving unit is driven by increasing the pressure in the adsorption unit and causing the gas to be adsorbed by the adsorbent, by either supplying air to be treated from the air supply unit to one space in the steam driving unit or sending high-pressure steam from the steam supply unit to the steam driving unit; and then the steam driving unit and the adsorption unit are separated from each other, or the gas in the adsorption unit is discharged, thereby desorbing the adsorbate adsorbed in the adsorption unit. [5] An air supply unit, an adsorption unit, a pressure reduction unit, a steam driving unit, a steam supply unit, and a recovery unit; the air supply is connected to the steam drive; the pressure reducing unit and the vapor driving unit are connected to the adsorption unit; the steam supply unit is connected to the pressure reducing unit and the steam driving unit; the pressure reducing section is connected to the recovery section, a first valve in a first pipe connecting the air supply unit and the steam driving unit; a second valve is provided in a second pipe connecting the vapor driving unit and the adsorption unit; a third valve is provided in a third pipe connecting the pressure reducing unit and the adsorption unit; a fourth valve on a fourth pipe connecting the steam supply unit and the steam driving unit; a fifth valve is provided on a fifth pipe connecting the steam supply unit and the pressure reducing unit; a sixth pipe for discharging residual gas that has not been adsorbed by the adsorption unit from the adsorption unit, the sixth pipe having a sixth valve or a pressure regulating valve; a seventh valve is provided in a seventh pipe connecting the pressure reducing section and the recovery section; the air supply unit supplies, to the vapor drive unit, air to be treated that contains a gas to be adsorbed in the adsorption unit; the adsorption section has an adsorbent having gas adsorption ability, a piston of the steam driving unit is driven by either supplying air to be treated from the air supply unit to one space within the steam driving unit or sending high-pressure steam from the steam supply unit to the steam driving unit, thereby increasing the pressure within the adsorption unit and causing the gas to be adsorbed by the adsorbent; and before or after connecting the decompression unit and the adsorption unit, heat is released from the decompression unit to reduce the pressure within the decompression unit, thereby desorbing the adsorbate adsorbed in the adsorption unit. [6] The gas recovery device described in [5], wherein the gas adsorbed in the adsorption section is diffused into the pressure reduction section, and then water vapor is supplied from the steam supply section to the pressure reduction section, and the gas, water vapor, and water in the pressure reduction section are discharged to the recovery section. [7] A cooling section is provided in the seventh pipe at a downstream side of the seventh valve, the recovery section has a gas-liquid separation trap, The gas, steam, and water discharged from the pressure reducing section are cooled in the cooling section, The gas recovery device according to [5] or [6], wherein the gas-liquid separation trap captures moisture and recovers gas. [8] A building air conditioning system comprising one or more gas recovery devices according to any one of [1] to [7] on different floors. [9] an adsorption step of bringing the air to be treated containing the gas to be adsorbed into an adsorbent provided in the first space, thereby adsorbing at least a portion of the gas into the adsorbent; a decompression step of supplying water vapor to a second space adjacent to the first space, and then releasing heat from the second space while the second space is closed, thereby condensing the water vapor in the second space into water and reducing the pressure in the second space; a diffusion step of desorbing the gas adsorbed by the adsorbent in the first space from the first space and diffusing it into the second space by reducing the pressure in the second space and connecting the first space with the second space.

[10] The gas recovery method described in [9], further comprising a discharge step of diffusing the gas adsorbed in the first space from the first space into the second space, stopping communication between the first space and the second space, supplying water vapor to the second space, and discharging the gas, water vapor, and water in the second space.

[11] The gas recovery method according to [9] or

[10] , comprising a recovery step of cooling the gas, the water vapor, and the water discharged from the second space and recovering the gas.

[12] A supply step of supplying the air to be treated containing the gas to be adsorbed to the first space; an adsorption step of supplying water vapor to a second space adjacent to the first space, supplying the air to be treated from the first space to a third space adjacent to the first space, and bringing the air into contact with an adsorbent provided in the third space, thereby adsorbing at least a portion of the gas onto the adsorbent; a desorption process for desorbing the gas adsorbed in the third space from the third space by supplying the air to be treated to the first space and discharging water vapor from the second space.

[13] A supply step of supplying the air to be treated containing the gas to be adsorbed into the first space; an adsorption step of supplying water vapor to a second space adjacent to the first space, supplying the air to be treated from the first space to a third space adjacent to the first space, and bringing the air into contact with an adsorbent provided in the third space, thereby adsorbing at least a portion of the gas onto the adsorbent; a desorption step of supplying water vapor to a fourth space adjacent to the third space, and then releasing heat from the fourth space while the fourth space is closed, thereby condensing the water vapor in the fourth space into water and reducing the pressure in the fourth space; a diffusion step of diffusing the gas adsorbed in the fourth space from the fourth space into the fifth space by connecting the fourth space with a fifth space adjacent to the fourth space.

[14] The gas recovery method described in

[13] , further comprising a discharge step of diffusing the gas adsorbed in the third space from the third space into the fourth space, stopping communication between the third space and the fourth space, supplying water vapor to the fourth space, and discharging the gas, water vapor, and water in the fourth space.

[15] The gas recovery method according to

[13] or

[14] , comprising a recovery step of cooling the gas, the water vapor, and the water discharged from the fourth space and recovering the gas. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a gas recovery device, a building air conditioning system, and a gas recovery method that suppress vibrations and noise. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram showing a gas recovery device according to an embodiment of the present invention. [Figure 2] 1 is a schematic diagram showing a building air conditioning system according to one embodiment of the present invention. [Figure 3] 1 is a schematic diagram showing a gas recovery device according to an embodiment of the present invention. [Figure 4] 1 is a schematic diagram showing a method of using a gas recovery device according to an embodiment of the present invention. [Figure 5] 1 is a schematic diagram showing a gas recovery device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] [Gas recovery device] A gas recovery device according to one embodiment of the present invention includes an air supply unit, an adsorption unit, a pressure reduction unit, a steam supply unit, and a recovery unit.

[0013] The gas recovery device of this embodiment will be described below with reference to the drawings. 1, the gas recovery apparatus 1 of this embodiment includes an air supply unit 10, an adsorption unit 20, a pressure reduction unit 30, a steam supply unit 40, and a recovery unit 50. The gas recovery apparatus 1 of this embodiment may also include a cooling unit 60.

[0014] The air supply unit 10 and the adsorption unit 20 are connected via a first pipe L1. A second pipe L2 is connected to the adsorption unit 20, which discharges residual gas that has not been adsorbed by the adsorption unit 20. The pressure reduction unit 30 and the steam supply unit 40 are connected via a third pipe L3. The pressure reduction unit 30 and the recovery unit 50 are connected via a fourth pipe L4. The adsorption unit 20 and the pressure reduction unit 30 are connected via a fifth pipe L5.

[0015] The first pipe L1 is provided with a first valve B1. The second pipe L2 is provided with a second valve B2. The third pipe L3 is provided with a third valve B3. The fourth pipe L4 is provided with a fourth valve B4. The fifth pipe L5 is provided with a fifth valve B5. The arrows in the figure indicate the direction of movement of a fluid such as air.

[0016] <Air supply section> The air supply unit 10 supplies the adsorption unit 20 with air to be treated that contains the gas to be adsorbed. Hereinafter, the gas to be adsorbed is referred to as the adsorbate. Examples of the adsorbate include carbon dioxide, oxygen, and nitrogen. The air supply unit 10 has a blower 11. The blower 11 may be, for example, a blower that imparts energy to gas by the rotational motion of an impeller.

[0017] <Adsorption part> The adsorption unit 20 adsorbs the adsorbate contained in the air to be treated supplied from the air supply unit 10 . The adsorption section 20 includes an adsorption tower 21 and an adsorbent section 22 filled with an adsorbent. The adsorbent is not particularly limited as long as it has the ability to adsorb an adsorbate (adsorption capacity). Examples of the adsorbent include zeolite, silica gel, activated carbon, solid absorbents carrying amines such as triethanolamine and monoethanolamine, and amine-based weakly basic anion exchange resins.

[0018] <Decompression section> The decompression section 30 creates a decompressed space (the space within the decompression section 30) in order to desorb the adsorbate adsorbed in the adsorbent section 22 of the adsorption section 20. The pressure reducing section 30 has a water vapor receiving section 31 for receiving water vapor from the steam supply section 40 and releasing the heat of the water vapor. The shape of the water vapor storage portion 31 is not particularly limited, but a spherical shape is preferable because it has excellent heat dissipation efficiency and excellent pressure resistance.

[0019] <Steam supply section> The steam supply unit 40 supplies water vapor to the pressure reduction unit 30 . The steam supply unit 40 includes a steam boiler 41, a water supply unit 42, and a sixth valve B6.

[0020] <Recovery Department> The recovery section 50 discharges the adsorbate, water vapor, and water from the pressure reducing section 30 . The recovery section 50 includes a gas-liquid separation trap 51 , an adsorbate recovery pipe 52 , and a drain pipe 53 .

[0021] <Cooling section> The cooling section 60 cools the adsorbate, water vapor, and water discharged from the pressure reducing section 30 . The cooling unit 60 includes a cooling water circulator 61 and a heat exchanger 62. The cooling unit 60 is provided in the fourth pipe L4 after the fourth valve B4.

[0022] In the gas recovery apparatus 1 of this embodiment, after supplying water vapor from the steam supply unit 40 to the pressure reduction unit 30, the third valve B3, the fourth valve B4, and the fifth valve B5 are closed and heat is released from the pressure reduction unit 30, causing the water vapor in the pressure reduction unit 30 to condense into water and reducing the pressure inside the pressure reduction unit 30. After reducing the pressure inside the pressure reduction unit 30, the fifth valve B5 is opened, causing the adsorbate adsorbed in the adsorption unit 20 to diffuse into the pressure reduction unit 30. Therefore, the adsorbate adsorbed in the adsorption unit 20 can be desorbed without using a compressor. This makes it possible to suppress the vibrations and noise that would conventionally occur when using a compressor.

[0023] Furthermore, in the gas recovery apparatus 1 of this embodiment, after the adsorbate adsorbed in the adsorption section 20 is diffused from the adsorption section 20 into the pressure reduction section 30, the fifth valve B5 is closed, and the third valve B3 and the fourth valve B4 are opened to supply steam from the steam supply section 40 to the pressure reduction section 30, and the adsorbate, steam, and water in the pressure reduction section 30 can be discharged to the recovery section 50. Therefore, the energy required to discharge the adsorbate, steam, and water in the pressure reduction section 30 to the recovery section 50 can be reduced.

[0024] Furthermore, in the gas recovery device 1 of this embodiment, the recovery section 50 has a gas-liquid separation trap 51, and the adsorbate, water vapor, and water discharged from the pressure reduction section 30 are cooled in the cooling section 60, and the gas-liquid separation trap 51 captures the moisture and recovers the adsorbate, so that a high concentration of adsorbate can be recovered.

[0025] [Gas recovery method] A gas recovery method according to one embodiment of the present invention includes an adsorption step, a decompression step, and a diffusion step. The gas recovery method according to this embodiment may also include a discharge step and a recovery step. The gas recovery method according to this embodiment will be described using a gas recovery method using the gas recovery device 1 as an example. Each step will be explained below with reference to FIG.

[0026] <Adsorption process> The adsorption process is a process in which the air to be treated, which contains the gas to be adsorbed (adsorbate), is brought into contact with the adsorbent in the adsorbent section 22 provided in the adsorption tower 21 (first space) of the adsorption section 20, thereby causing at least a portion of the adsorbate to be adsorbed by the adsorbent.

[0027] In the adsorption step, first, the first valve B1 is opened, and the second valve B2 and the fifth valve B5 are closed. The blower 11 is operated to suck in the air to be treated, and the air to be treated is supplied to the adsorption tower 21 via the first pipe L1. In this embodiment, the air to be treated is air. The air includes, for example, post-activity air in which the carbon dioxide concentration has increased due to human activity. In addition to post-activity air, examples of the air to be treated include post-combustion air generated by combustion.

[0028] The concentration of carbon dioxide in the air to be treated is, for example, preferably 100 ppm to 5000 ppm, more preferably 200 ppm to 4000 ppm, even more preferably 300 ppm to 3000 ppm, even more preferably 400 ppm to 2000 ppm, particularly preferably 500 ppm to 1500 ppm, and most preferably 600 ppm to 1000 ppm. When the concentration of carbon dioxide in the air to be treated is equal to or higher than the lower limit, more carbon dioxide can be adsorbed onto the adsorbent, and more carbon dioxide can be desorbed in the desorption step. When the concentration of carbon dioxide in the air to be treated is equal to or lower than the upper limit, the adsorption capacity of the adsorbent is less likely to deteriorate. In addition, when the concentration of carbon dioxide in the air to be treated is equal to or lower than the upper limit, cleaner treated air can be discharged from the recovery section 50.

[0029] At least a portion of the adsorbates in the air to be treated that has come into contact with the adsorbent is adsorbed by the adsorbent in the adsorbent section 22. As a result, treated air with a reduced concentration of adsorbates is obtained.

[0030] <Decompression process> The decompression process is a process in which water vapor is supplied into the decompression section 30 (second space) adjacent to the first space, and then the second space is closed and heat is released from the second space, causing the water vapor in the second space to condense into water and reducing the pressure inside the second space.

[0031] In the decompression step, first, the fourth valve B4 and the fifth valve B5 are closed, and water vapor is supplied from the steam supply unit 40 into the decompression unit 30 (second space). Next, the third valve B3 is closed. In this state, the heat of the water vapor inside the decompression unit 30 is released from the decompression unit 30. This causes the water vapor inside the decompression unit 30 (second space) to condense into water, and the pressure inside the decompression unit 30 (second space) is reduced.

[0032] <Diffusion process> In the diffusion process, after reducing the pressure inside the decompression section 30 (second space), the adsorption tower 21 (first space) is connected to the decompression section 30 (second space), thereby diffusing the adsorbate adsorbed in the adsorbent section 22 of the adsorption tower 21 from the adsorption tower 21 (first space) to the decompression section 30 (second space).

[0033] In the diffusion process, the fifth valve B5 is opened to connect the adsorption tower 21 (first space) and the reduced pressure section 30 (second space), and the adsorbate adsorbed in the adsorbent section 22 diffuses so that the adsorption tower 21 (first space) and the reduced pressure section 30 (second space) are at equal pressure and equal concentration.

[0034] <Discharge process> The discharge process is a process in which the adsorbate adsorbed in the adsorbent section 22 of the adsorption section 20 is diffused from the adsorption tower 21 (first space) to the reduced pressure section 30 (second space), the communication between the adsorption tower 21 (first space) and the reduced pressure section 30 (second space) is stopped, water vapor is supplied to the reduced pressure section 30 (second space), and the adsorbate, water vapor, and water in the reduced pressure section 30 (second space) are discharged.

[0035] In the discharge step, the adsorbate adsorbed in the adsorbent section 22 of the adsorption section 20 is diffused into the depressurization section 30 (second space), and then the fifth valve B5 is closed to stop communication between the adsorption tower 21 (first space) and the depressurization section 30 (second space). Thereafter, the third valve B3 and the fourth valve B4 are opened to supply steam from the steam supply section 40 to the depressurization section 30, and the adsorbate, steam, and water in the depressurization section 30 (second space) are discharged to the recovery section 50.

[0036] <Recovery process> The recovery step is a step of cooling the adsorbate, water vapor, and water discharged from the reduced pressure section 30 (second space) and recovering the adsorbate.

[0037] In the recovery step, the adsorbate, steam, and water discharged from the pressure reducing section 30 are cooled in the cooling section 60, and the steam and water are recovered in the gas-liquid separation trap 51 and discharged from the drain pipe 53. In addition, the highly concentrated adsorbate separated from the steam and water is recovered via the adsorbate recovery pipe 52.

[0038] In the gas recovery method of this embodiment, in the depressurization step, after supplying steam from the steam supply unit 40 to the depressurization unit 30, the third valve B3, the fourth valve B4, and the fifth valve B5 are closed, and heat is released from the steam supply unit 40 to condense the steam in the depressurization unit 30 into water, thereby reducing the pressure inside the depressurization unit 30. Furthermore, in the diffusion step, after reducing the pressure inside the depressurization unit 30, the fifth valve B5 is opened, thereby diffusing the adsorbate adsorbed in the adsorption unit 20 from the adsorption unit 20 into the depressurization unit 30. Therefore, the adsorbate adsorbed in the adsorption unit 20 can be desorbed without using a compressor. This makes it possible to suppress the vibrations and noise that would conventionally occur when using a compressor.

[0039] In the gas recovery method of the present embodiment, in the above-mentioned discharge step, after the adsorbate adsorbed in the adsorption unit 20 is diffused from the adsorption unit 20 into the pressure reduction unit 30, the fifth valve B5 is closed, and the third valve B3 and the fourth valve B4 are opened to supply steam from the steam supply unit 40 to the pressure reduction unit 30, and the adsorbate, steam, and water in the pressure reduction unit 30 can be discharged to the recovery unit 50. Therefore, the energy required to discharge the adsorbate, steam, and water in the pressure reduction unit 30 to the recovery unit 50 can be reduced.

[0040] In the gas recovery method of this embodiment, in the recovery process, the adsorbate, water vapor, and water discharged from the pressure reduction section 30 are cooled in the cooling section 60, and the gas-liquid separation trap 51 collects the moisture and recovers the adsorbate, making it possible to recover a high concentration of adsorbate.

[0041] [Building air conditioning systems] A building air conditioning system according to one embodiment of the present invention is provided with a plurality of the above-described gas recovery devices on different floors. In a building air conditioning system, it is sufficient that one or more of the above-described gas recovery devices are provided on one floor. For example, by installing gas recovery devices on two or more floors, the amount of adsorbate that can be stored can be increased, and the amount of adsorbate recovered can be increased. In this case, the adsorbate discharged from the gas recovery devices on different floors can be stored on each floor, or they can be stored together in one location. The amount of adsorbate that can be stored can be increased according to the number of gas recovery devices.

[0042] The building air conditioning system of this embodiment will be described below with reference to the drawings. As shown in FIG. 2, the building air conditioning system 200 of this embodiment includes a plurality of gas recovery devices 210, piping 220, and a recovery section 230. A gas recovery device 210 is provided on each ground floor A of building 201. Pipes 220 extend vertically within building 201, reaching from the top ground floor to basement floor B. Pipes 220 are connected to a recovery unit 230 on basement floor B via booster blower 212. The gas recovery device 210 on each ground floor A is connected to a pipe 220 .

[0043] The gas recovery device 210 is a device in which the recovery section 50 in the gas recovery device 1 shown in FIG. 1 has been removed.

[0044] In the building air conditioning system 200 of this embodiment, the adsorbate discharged from the gas recovery device 210 on each upper floor A reaches the piping 220. The mixed fluid that reaches the piping 220 flows down the piping 220 and is filled into the recovery section 230 by the booster blower 212. In this way, by collecting the adsorbate on each floor and collecting it, a larger amount of adsorbate can be collected.

[0045] [Other embodiments] The present invention is not limited to the above-described embodiment.

[0046] For example, a first modified example or a second modified example described later may be adopted.

[0047] "First Variation" The gas recovery device 300 of the first modified example shown in FIG. 3 includes an air supply unit 310, an adsorption unit 320, a vapor driving unit 330, and a vapor supply unit 340.

[0048] The air supply unit 310 and the steam driving unit 330 are connected via a first pipe L11. The steam driving unit 330 and the adsorption unit 320 are connected via a second pipe L12. The steam supply unit 340 and the steam driving unit 330 are connected via a third pipe L13. A fourth pipe L14 is connected to the adsorption unit 320, and discharges residual gas that has not been adsorbed by the adsorption unit 320.

[0049] The first pipe L11 is provided with a first valve B11. The second pipe L12 is provided with a second valve B12. The third pipe L13 is provided with a third valve B13. The fourth pipe L14 is provided with a fourth valve B14. The fourth valve B14 is preferably a pressure regulating valve. The pipe branching off from the second pipe L12 is provided with a fifth valve B15. The first pipe L11 may be provided with a seventh valve (check valve) B17. The pipe branching off from the third pipe L13 is provided with an eighth valve B18.

[0050] <Air supply section> The air supply unit 310 supplies the steam driving unit 330 with air to be treated, which contains gas to be adsorbed in the adsorption unit 320 . The air supply unit 310 has a blower 311. The blower 311 may be, for example, a blower that imparts energy to gas by the rotational motion of an impeller.

[0051] <Adsorption part> The adsorption section 320 adsorbs the adsorbate contained in the air to be treated supplied from the air supply section 310 . The adsorption section 320 includes an adsorption tower 321 and an adsorbent section 322 filled with an adsorbent. The adsorbent is not particularly limited as long as it has the ability to adsorb an adsorbate (adsorption capacity). Examples of the adsorbent include zeolite, silica gel, activated carbon, solid absorbents carrying amines such as triethanolamine and monoethanolamine, and amine-based weakly basic anion exchange resins.

[0052] <Steam drive unit> The steam driver 330 has a cylinder 331, a piston 332, and a spring 333. The interior of the cylinder 331 is divided into a gas chamber 331A and a steam chamber 331B via the piston 332. The spring 333 is connected to the piston 332 and is disposed in the steam chamber 331B. A sixth pipe L16 that discharges water vapor from the steam chamber 331B is connected to the steam chamber 331B. A sixth valve B16 is provided on the sixth pipe L16.

[0053] <Steam supply section> The steam supply unit 340 supplies water vapor to the steam driving unit 330 . The steam supply unit 340 includes a steam boiler 341 .

[0054] In the gas recovery apparatus 300 of this embodiment, with the first valve B11, the fifth valve B15, and the eighth valve B18 open and the second valve B12, the third valve B13, and the fourth valve B14 closed, the air to be treated is supplied from the air supply unit 310 to the gas chamber 331A of the steam drive unit 330, and the piston 332 is driven toward the steam chamber 331B to pressurize the water vapor in the steam chamber 331B, discharge the water vapor from the steam chamber 331B, and depressurize the gas chamber 331A. This desorbs the adsorbate adsorbed in the adsorption unit 320. Therefore, the adsorbate adsorbed in the adsorption unit 320 can be desorbed without using a compressor. This suppresses the vibration and noise that would normally be generated by using a compressor.

[0055] [Gas recovery method] A gas recovery method according to one embodiment of the present invention includes a supplying step, an adsorption step, and a desorption step. The gas recovery method according to this embodiment will be described using a gas recovery method using a gas recovery device 300 as an example. Each step will be explained below with reference to FIG. 4 and Table 1.

[0056] [Table 1]

[0057] <Supply process> The supply step is a step of supplying the air to be treated, which contains the gas to be adsorbed (adsorbate), to the gas chamber 331A (first space) of the vapor driving part 330.

[0058] In the supply step, first, the first valve B11, the second valve B12, and the fourth valve B14 are opened, and the third valve B13, the fourth valve B14, the fifth valve B15, and the eighth valve B18 are closed. The blower 311 is operated to suck in the air to be treated, and the air to be treated is supplied to the gas chamber 331A of the steam driver 330 via the first pipe L11.

[0059] <Adsorption process> The adsorption process is a process in which water vapor is supplied to the steam chamber 331B (second space) of the steam driving section 330 adjacent to the gas chamber 331A (first space) of the steam driving section 330, and the air to be treated is supplied from the first space to the internal space (third space) of the adsorption section 320 adjacent to the first space, and the air is brought into contact with the adsorbent provided in the third space, thereby causing at least a portion of the adsorbate to be adsorbed by the adsorbent.

[0060] In the adsorption step, the second valve B12, the third valve B13, and the fourth valve B14 are opened, and the first valve B11, the fourth valve B14, the fifth valve B15, the sixth valve B16, and the eighth valve B18 are closed, and steam is supplied from the steam supply unit 340 to the steam chamber 331B of the steam drive unit 330. Here, the fourth valve B14 is a pressure control valve, and the valve is opened and closed while adjusting to maintain a pressurized state inside the adsorption unit 320. This drives the piston 332 toward the gas chamber 331A, pressurizing the air to be treated in the gas chamber 331A, and the pressurized air to be treated is supplied from the gas chamber 331A of the steam drive unit 330 to the adsorption unit 320. This adsorption step may be carried out multiple times as follows. First, the second valve B12, the third valve B13, the fourth valve B14, and the fifth valve B15 are closed, and the first valve B11, the sixth valve B16, and the eighth valve B18 are opened to move the piston 332 toward the steam chamber 331B. Next, the second valve B12, the third valve B13, and the fourth valve B14 are opened, and the first valve B11, the fifth valve B15, the sixth valve B16, and the eighth valve B18 are closed, and steam is supplied from the steam supply unit 340 to the steam chamber 331B of the steam drive unit 330. This drives the piston 332 toward the gas chamber 331A, pressurizing the air to be treated in the gas chamber 331A, and the pressurized air to be treated is supplied from the gas chamber 331A of the steam drive unit 330 to the adsorption unit 320. Here, the fourth valve B14 is a pressure adjustment valve, and the valve is opened and closed while adjusting the pressure so that the inside of the adsorption unit 320 is kept pressurized.

[0061] <Desorption process> The desorption process is a process in which the air to be treated is supplied to the first space, and water vapor is discharged from the second space, or the adsorbate adsorbed in the third space is desorbed from the third space by opening the fifth valve B15.

[0062] In the desorption step, the first valve B11, the fifth valve B15, the sixth valve B16, and the eighth valve B18 are opened, and the second valve B12, the third valve B13, and the fourth valve B14 are closed. Air to be treated is supplied from the air supply unit 310 to the first space, and the piston 332 is driven toward the second space to pressurize the water vapor in the second space, discharge the water vapor from the second space, and reduce the pressure in the first space. The fifth valve B15 is also opened. This desorbs the adsorbate adsorbed in the adsorption unit 320.

[0063] In the gas recovery method of this embodiment, in the desorption step, the first valve B11, the fifth valve B15, the sixth valve B16, and the eighth valve B18 are opened, and the second valve B12, the third valve B13, and the fourth valve B14 are closed. The air to be treated is supplied from the air supply unit 310 to the first space, and the piston 332 is driven toward the second space to pressurize the water vapor in the second space, discharge the water vapor from the second space, and reduce the pressure in the first space. The fifth valve B15 is also opened. This desorbs the adsorbate adsorbed in the adsorption unit 320. Therefore, the adsorbate adsorbed in the adsorption unit 320 can be desorbed without using a compressor. This suppresses the vibration and noise that would otherwise be generated by using a compressor.

[0064] "Second Variant" 5 includes an air supply unit 410, an adsorption unit 420, a pressure reduction unit 430, a steam driving unit 440, a steam supply unit 450, and a recovery unit 460. The gas recovery unit 400 of the second modification may include a cooling unit 470.

[0065] The air supply unit 410 and the steam driving unit 440 are connected via a first pipe L21. The steam driving unit 440 and the adsorption unit 420 are connected via a second pipe L22. The pressure reduction unit 430 and the adsorption unit 420 are connected via a third pipe L23. The steam supply unit 450 and the steam driving unit 440 are connected via a fourth pipe L24. The steam supply unit 450 and the pressure reduction unit 430 are connected via a fifth pipe L25. The adsorption unit 420 is connected to a sixth pipe L26 that discharges residual gas that has not been adsorbed by the adsorption unit 420. The pressure reduction unit 430 and the recovery unit 460 are connected via a seventh pipe L27.

[0066] The first pipe L21 is provided with a first valve B21. The second pipe L22 is provided with a second valve B22. The third pipe L23 is provided with a third valve B23. The fourth pipe L24 is provided with a fourth valve B24. The fifth pipe L25 is provided with a fifth valve B25. The sixth pipe L26 is provided with a sixth valve B26. The sixth valve B26 is preferably a pressure regulating valve. The seventh pipe L27 is provided with a seventh valve B27. The first pipe L21 may be provided with a ninth valve (check valve) B29. The fourth pipe L24 is provided with a tenth valve B30 adjacent to the fourth valve B24.

[0067] <Air supply section> The air supply unit 410 supplies the steam driving unit 440 with air to be treated, which contains gas to be adsorbed in the adsorption unit 420 . Air supply unit 410 has blower 411. As blower 411, for example, a blower that gives energy to gas by the rotational motion of an impeller can be mentioned.

[0068] <Adsorption part> The adsorption unit 420 adsorbs the adsorbate contained in the air to be treated supplied from the air supply unit 410 . The adsorption section 420 includes an adsorption tower 421 and an adsorbent section 422 filled with an adsorbent. The adsorbent is not particularly limited as long as it has the ability to adsorb an adsorbate (adsorption capacity). Examples of the adsorbent include zeolite, silica gel, activated carbon, solid absorbents carrying amines such as triethanolamine and monoethanolamine, and amine-based weakly basic anion exchange resins.

[0069] <Decompression section> The decompression section 430 creates a decompressed space (a fourth space within the decompression section 430) in order to desorb the adsorbate adsorbed in the adsorbent section 422 of the adsorption section 420. The pressure reducing section 430 has a water vapor receiving section 431 for receiving water vapor from the steam supply section 450 and releasing the heat of the water vapor. The shape of the water vapor storage portion 431 is not particularly limited, but a spherical shape is preferable because it has excellent heat dissipation efficiency and excellent pressure resistance.

[0070] <Steam drive unit> The steam driving unit 440 has a cylinder 441, a piston 442, and a spring 443. The interior of the cylinder 441 is divided into a gas chamber 441A and a steam chamber 441B via the piston 442. The spring 443 is connected to the piston 442 and is disposed in the steam chamber 441B. An eighth pipe L28 that discharges water from the steam chamber 441B is connected to the steam chamber 441B. An eighth valve B28 is provided on the eighth pipe L28.

[0071] <Steam supply section> The steam supply unit 450 supplies water vapor to the steam driving unit 440 and the pressure reducing unit 430 . The steam supply unit 450 includes a steam boiler 451 .

[0072] <Recovery Department> The recovery section 460 discharges the adsorbate, water vapor, and water from the adsorption section 420 . The recovery section 460 includes a gas-liquid separation trap 461 , an adsorbate recovery pipe 462 , and a drain pipe 463 .

[0073] <Cooling section> The cooling section 470 cools the adsorbate, water vapor, and water discharged from the pressure reducing section 430 . The cooling unit 470 includes a cooling water circulator 471 and a heat exchanger 472. The cooling unit 470 is provided in the seventh pipe L27 after the seventh valve B27.

[0074] In the gas recovery apparatus 400 of this embodiment, with the third valve B23 open and the first valve B21, the second valve B22, the fourth valve B24, the fifth valve B25, the sixth valve B26, the seventh valve B27, and the tenth valve B30 closed, heat is released from the pressure reduction section 430, causing water vapor in the pressure reduction section 430 to condense into water, thereby reducing the pressure inside the pressure reduction section 430. Furthermore, with the first valve B21, the fourth valve B24, the fifth valve B25, the seventh valve B27, and the tenth valve B30 open and the second valve B22, the third valve B23, and the sixth valve B26 closed, the pressure reduction section 430 and the recovery section 460 are communicated with each other, and the adsorbate adsorbed in the adsorption section 420 is diffused from the pressure reduction section 430 to the recovery section 460. Therefore, it is possible to desorb the adsorbate adsorbed on the adsorption unit 420 without using a compressor, and it is therefore possible to suppress the vibrations and noise that would conventionally be caused by using a compressor.

[0075] [Gas recovery method] A gas recovery method according to one embodiment of the present invention includes a supply step, a heat-releasing vapor condensation step, an adsorption step, a desorption step, and a diffusion step. The gas recovery method according to this embodiment may also include a discharge step and a recovery step. The gas recovery method according to this embodiment will be described using a gas recovery method using a gas recovery device 400 as an example. Each step will be explained below with reference to FIG. 5 and Table 2.

[0076] [Table 2]

[0077] <Supply process> The supply process is a process in which air to be treated containing the gas to be adsorbed (adsorbate) is supplied to the adsorption section 420 from the air supply section 410 via the gas chamber 441A (first space) of the steam drive section 440, and water vapor is supplied from the steam supply section 450 to the pressure reduction section 430.

[0078] In the supply step, first, the first valve B21, the second valve B22, the fourth valve B24, the fifth valve B25, and the sixth valve B26 are opened, and the third valve B23, the seventh valve B27, and the tenth valve B30 are closed. The blower 411 is operated to suck in the air to be treated, and the air to be treated is supplied to the gas chamber 441A of the steam driving unit 440 via the first pipe L21. In addition, water vapor is supplied from the steam supply unit 450 to the pressure reduction unit 430.

[0079] <Heat-releasing steam condensation process> The heat-releasing steam condensation step is a step of supplying the air to be treated, which contains the gas to be adsorbed (adsorbate), to the adsorption section 420 from the air supply section 410 via the gas chamber 441A (first space) of the steam driving section 440.

[0080] In the heat dissipation steam condensation step, the first valve B21, the second valve B22, and the sixth valve B26 are opened, and the third valve B23, the fourth valve B24, the fifth valve B25, the seventh valve B27, and the tenth valve B30 are closed. The blower 411 is operated to suck in the air to be treated, and the air to be treated is supplied to the gas chamber 441A of the steam driver 440 via the first pipe L21.

[0081] <Adsorption process> The adsorption process is a process in which water vapor is supplied to the steam chamber 441B (second space) of the steam driving unit 440 adjacent to the gas chamber 441A (first space) of the steam driving unit 440, the air to be treated is supplied from the first space to the internal space (third space) of the adsorption unit 420 adjacent to the first space, and the air is brought into contact with the adsorbent provided in the third space, thereby causing at least a portion of the adsorbate to be adsorbed by the adsorbent.

[0082] In the adsorption step, the second valve B22, the fourth valve B24, the sixth valve B26, and the tenth valve B30 are opened, and the first valve B21, the third valve B23, the fifth valve B25, and the seventh valve B27 are closed, and steam is supplied from the steam supply unit 450 to the steam chamber 441B of the steam drive unit 440. Here, the sixth valve B26 is a pressure regulating valve, and the valve is opened and closed while adjusting so that the inside of the adsorption unit 420 is kept pressurized. This drives the piston 442 toward the gas chamber 441A, pressurizing the air to be treated in the gas chamber 441A, and the air to be treated is supplied from the gas chamber 441A of the steam drive unit 440 to the adsorption unit 420. This adsorption step may be carried out multiple times, and the procedure is the same as that described in

[0060] .

[0083] <Desorption process> The desorption process is a process in which water vapor is supplied into the pressure reduction section 430 (fourth space) adjacent to the third space, and then the fourth space is closed and heat is released from the fourth space to condense the water vapor in the fourth space into water and reduce the pressure inside the fourth space.

[0084] In the desorption step, the third valve B23 is opened, and the first valve B21, the second valve B22, the fourth valve B24, the fifth valve B25, the sixth valve B26, the seventh valve B27, and the tenth valve B30 are closed. In this state, the heat of the water vapor inside the decompression section 430 is released from the decompression section 430. This causes the water vapor inside the decompression section 430 (fourth space) to condense into water, and the pressure inside the decompression section 430 (fourth space) is reduced.

[0085] <Diffusion process> The diffusion process is a process in which the adsorbate adsorbed in the third space is diffused from the fourth space into the fifth space by connecting the fourth space with the collection section 460 (fifth space) adjacent to the fourth space.

[0086] In the diffusion process, the first valve B21, the fourth valve B24, the fifth valve B25, and the seventh valve B27 are opened, and the second valve B22, the third valve B23, the sixth valve B26, and the tenth valve B30 are closed, connecting the fourth space and the fifth space, and diffusing the adsorbate adsorbed in the adsorption section 420 from the pressure reduction section 430 to the recovery section 460.

[0087] <Discharge process> The discharge process is a process in which the adsorbate adsorbed in the adsorbent section 422 of the adsorption section 420 is diffused from the adsorption tower 421 (third space) to the pressure reduction section 430 (fourth space), the communication between the adsorption tower 421 (third space) and the pressure reduction section 430 (fourth space) is stopped, water vapor is supplied to the pressure reduction section 430 (fourth space), and the adsorbate, water vapor, and water in the pressure reduction section 430 (fourth space) are discharged.

[0088] In the discharge step, the adsorbate adsorbed in the adsorbent section 422 of the adsorption section 420 is diffused into the decompression section 430 (fourth space), and then the second valve B22 and the third valve B23 are closed to stop communication between the adsorption tower 421 (third space) and the decompression section 430 (fourth space). Thereafter, the fourth valve B24 and the fifth valve B25 are opened to supply steam from the steam supply section 450 to the decompression section 430, and the seventh valve B27 is opened to discharge the adsorbate, steam, and water in the decompression section 430 (fourth space) to the recovery section 460.

[0089] <Recovery process> The recovery step is a step of cooling the adsorbate, water vapor, and water discharged from the decompression section 430 (fourth space) and recovering the adsorbate.

[0090] In the recovery step, the adsorbate, steam, and water discharged from the pressure reducing section 430 are cooled in the cooling section 470, and the steam and water are recovered in the gas-liquid separation trap 461 and discharged from the drain pipe 473. In addition, the highly concentrated adsorbate separated from the steam and water is recovered via the adsorbate recovery pipe 52.

[0091] In the gas recovery method of this embodiment, in the desorption step, the third valve B23 is opened, and the first valve B21, the second valve B22, the fourth valve B24, the fifth valve B25, the sixth valve B26, the seventh valve B27, and the tenth valve B30 are closed. In this state, the heat of the water vapor inside the pressure reduction section 430 is released from the pressure reduction section 430. This causes the water vapor inside the pressure reduction section 430 (fourth space) to condense into water, and the pressure inside the pressure reduction section 430 (fourth space) is reduced. Furthermore, in the diffusion step, the first valve B21, the fourth valve B24, the fifth valve B25, the seventh valve B27, and the tenth valve B30 are opened, and the second valve B22, the third valve B23, and the sixth valve B26 are closed, thereby communicating the fourth space with the fifth space and diffusing the adsorbate adsorbed in the adsorption unit 420 from the pressure reduction unit 430 to the recovery unit 460. Therefore, the adsorbate adsorbed in the adsorption unit 420 can be desorbed without using a compressor. This makes it possible to suppress the vibrations and noise that would conventionally be generated by using a compressor.

[0092] As described above, the air conditioning system of this embodiment can remove adsorbates such as carbon dioxide from the outside air and the air inside a room. Therefore, treated air with a reduced adsorbate concentration can be supplied to the room. According to the air conditioning system of this embodiment, the removed adsorbates can be recovered, and therefore the recovered adsorbates can be used as an energy source such as a carbon source. According to the air conditioning system of this embodiment, the treated air can be circulated and reused, eliminating the need to rely on outside air to supply air to rooms. This reduces the outside air load, which is said to account for 40% of the air conditioning load. According to the air conditioning system of this embodiment, the air conditioning load can be reduced, which reduces the air conditioning cost and the energy required for air conditioning, leading to a reduction in carbon dioxide emissions from the power plant. According to the air conditioning system of this embodiment, carbon dioxide can be directly captured from outside air, and if it is widely used, it will lead to a reduction in carbon dioxide, etc. on a global scale. In addition, because carbon dioxide, etc. can be directly captured from outside air, it can capture carbon dioxide, etc. in large quantities and more stably than conventional technologies that absorb carbon dioxide, etc. only from indoor exhaust.

[0093] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications are possible within the scope of the gist of the present invention as described in the claims. [Explanation of symbols]

[0094] 1,300,400 Gas recovery equipment 10,310,410 Air supply unit 20,320,420 Adsorption part 30,430 Pressure reducing section 40,340,450 Steam supply section 50,350,460 Collection Department 60,470 Cooling section 330,440 Steam drive section 200 Building air conditioning system

Claims

1. The system includes an air supply unit, an adsorption unit, a pressure reduction unit, a steam supply unit, and a recovery unit, the air supply unit and the pressure reduction unit are connected to the adsorption unit, the steam supply unit is connected to the pressure reducing unit, a first valve is provided in a first pipe connecting the air supply unit and the adsorption unit; a second valve is provided in a second pipe for discharging residual gas that has not been adsorbed by the adsorption unit from the adsorption unit; a third valve is provided on a third pipe connecting the pressure reducing section and the steam supply section; a fourth valve is provided in a fourth pipe connecting the pressure reducing section and the recovery section; a fifth valve is provided in a fifth pipe connecting the adsorption unit and the pressure reduction unit; the air supply unit supplies air to be treated containing a gas to be adsorbed to the adsorption unit; the adsorption section has an adsorbent having gas adsorption ability, supplying water vapor from the steam supply unit to the pressure reduction unit, and then releasing heat from the pressure reduction unit while the third valve, the fourth valve, and the fifth valve are closed, thereby condensing the water vapor in the pressure reduction unit into water and reducing the pressure inside the pressure reduction unit; a gas recovery device, wherein after the pressure inside the pressure reducing section is reduced, the fifth valve is opened to cause the gas adsorbed by the adsorption section to diffuse from the adsorption section into the pressure reducing section;

2. 2. The gas recovery device according to claim 1, wherein after the gas adsorbed in the adsorption section is diffused into the pressure reduction section, the fifth valve is closed, the third valve and the fourth valve are opened, steam is supplied from the steam supply section to the pressure reduction section, and the gas, steam, and water in the pressure reduction section are discharged to the recovery section.

3. a cooling section in the fourth pipe at a downstream side of the fourth valve; the recovery section has a gas-liquid separation trap, The gas, the water vapor, and the water discharged from the pressure reducing section are cooled in the cooling section, 2. The gas recovery device according to claim 1, wherein the gas-liquid separation trap collects the gas by trapping moisture.

4. The apparatus includes an air supply unit, an adsorption unit, a steam driving unit, and a steam supply unit, the air supply is connected to the steam drive; the steam supply is connected to the steam drive; a first valve in a first pipe connecting the air supply unit and the steam driving unit; a second valve is provided in a second pipe connecting the vapor driving unit and the adsorption unit; a third valve in a third pipe connecting the steam supply unit and the steam driving unit; a fourth pipe for discharging residual gas that has not been adsorbed by the adsorption unit from the adsorption unit, the fourth pipe having a fourth valve or a pressure regulating valve; the air supply unit supplies, to the vapor drive unit, air to be treated that contains a gas to be adsorbed in the adsorption unit; the adsorption section has an adsorbent having gas adsorption ability, a piston of the steam driving unit is driven by increasing the pressure in the adsorption unit and causing the gas to be adsorbed by the adsorbent, by either supplying air to be treated from the air supply unit to one space in the steam driving unit or sending high-pressure steam from the steam supply unit to the steam driving unit; and then the steam driving unit and the adsorption unit are separated from each other, or the gas in the adsorption unit is discharged, thereby desorbing the adsorbate adsorbed in the adsorption unit.

5. The system includes an air supply unit, an adsorption unit, a pressure reduction unit, a steam driving unit, a steam supply unit, and a recovery unit, the air supply is connected to the steam drive; the pressure reducing unit and the vapor driving unit are connected to the adsorption unit; the steam supply unit is connected to the pressure reducing unit and the steam driving unit; the pressure reducing section is connected to the recovery section, a first valve in a first pipe connecting the air supply unit and the steam driving unit; a second valve is provided in a second pipe connecting the vapor driving unit and the adsorption unit; a third valve is provided in a third pipe connecting the pressure reducing unit and the adsorption unit; a fourth valve in a fourth pipe connecting the steam supply unit and the steam driving unit; a fifth valve is provided in a fifth pipe connecting the steam supply unit and the pressure reducing unit; a sixth valve or a pressure regulating valve is provided in a sixth pipe that discharges residual gas that has not been adsorbed by the adsorption unit from the adsorption unit; a seventh valve is provided in a seventh pipe connecting the pressure reducing section and the recovery section; the air supply unit supplies, to the vapor drive unit, air to be treated that contains a gas to be adsorbed in the adsorption unit; the adsorption section has an adsorbent having gas adsorption ability, a piston of the steam driving unit is driven by either supplying air to be treated from the air supply unit to one space within the steam driving unit or sending high-pressure steam from the steam supply unit to the steam driving unit, thereby increasing the pressure within the adsorption unit and causing the gas to be adsorbed by the adsorbent; and before or after connecting the decompression unit and the adsorption unit, heat is released from the decompression unit to reduce the pressure within the decompression unit, thereby desorbing the adsorbate adsorbed in the adsorption unit.

6. 6. The gas recovery device according to claim 5, wherein the gas adsorbed in the adsorption section is diffused into the pressure reduction section, and then water vapor is supplied from the steam supply section to the pressure reduction section, and the gas, water vapor, and water in the pressure reduction section are discharged to the recovery section.

7. a cooling section in the seventh pipe at a downstream side of the seventh valve; the recovery section has a gas-liquid separation trap, The gas, steam, and water discharged from the pressure reducing section are cooled in the cooling section, 6. The gas recovery device according to claim 5, wherein the gas-liquid separation trap collects the gas by trapping moisture.

8. A building air conditioning system comprising one or more gas recovery devices according to any one of claims 1 to 7 on different floors.

9. an adsorption step of bringing the air to be treated, which contains the gas to be adsorbed, into contact with an adsorbent provided in a first space, thereby adsorbing at least a portion of the gas onto the adsorbent; a decompression step of supplying water vapor to a second space adjacent to the first space, and then releasing heat from the second space while the second space is closed, thereby condensing the water vapor in the second space into water and reducing the pressure in the second space; a diffusion step of desorbing the gas adsorbed by the adsorbent in the first space from the first space and diffusing it into the second space by connecting the first space with the second space after reducing the pressure in the second space.

10. 10. The gas recovery method according to claim 9, further comprising a discharge step of diffusing the gas adsorbed in the first space from the first space into the second space, stopping communication between the first space and the second space, and supplying water vapor to the second space to discharge the gas, water vapor, and water from the second space.

11. The gas recovery method according to claim 9 , further comprising a recovery step of cooling the gas, the water vapor, and the water discharged from the second space and recovering the gas.

12. a supply step of supplying air to be treated containing a gas to be adsorbed to the first space; an adsorption step of supplying water vapor to a second space adjacent to the first space, supplying the air to be treated from the first space to a third space adjacent to the first space, and bringing the air into contact with an adsorbent provided in the third space, thereby adsorbing at least a portion of the gas onto the adsorbent; a desorption process for desorbing the gas adsorbed in the third space from the third space by supplying the air to be treated to the first space and discharging water vapor from the second space.

13. a supply step of supplying air to be treated containing a gas to be adsorbed to the first space; an adsorption step of supplying water vapor to a second space adjacent to the first space, supplying the air to be treated from the first space to a third space adjacent to the first space, and bringing the air into contact with an adsorbent provided in the third space, thereby adsorbing at least a portion of the gas onto the adsorbent; a desorption step of supplying water vapor to a fourth space adjacent to the third space, and then releasing heat from the fourth space while the fourth space is closed, thereby condensing the water vapor in the fourth space into water and reducing the pressure in the fourth space; a diffusion step of diffusing the gas adsorbed in the fourth space from the fourth space into the fifth space by connecting the fourth space with a fifth space adjacent to the fourth space.

14. 14. The gas recovery method according to claim 13, further comprising a discharge step of diffusing the gas adsorbed in the third space from the third space into the fourth space, stopping communication between the third space and the fourth space, and supplying water vapor to the fourth space to discharge the gas, water vapor, and water in the fourth space.

15. The gas recovery method according to claim 13 , further comprising a recovery step of cooling the gas, the water vapor, and the water discharged from the fourth space and recovering the gas.

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