Dry air generation device and dry air generation system

Abstract

Provided is a dry air generation device 10 that generates dry air in which CO2 and water have been removed from a mixed gas, the dry air generation device 10 comprising a separation membrane (20) that removes CO2 and water from the mixed gas, wherein a condensation water removal unit (21) is provided on a surface of the separation membrane (20) having a high CO2 concentration. In addition, the dry air generation device (10) further comprises: a housing (30) in which the interior is partitioned by the separation membrane (20); a first pipe (31) that is connected to the housing (30) and sends the mixed gas to the separation membrane (20); a second pipe (32) that is connected to the housing (30) and through which is sent dry air from which CO2 and water have been removed by the separation membrane (20); and a third pipe (33) that is connected to the housing (30) and through which is sent the CO2 and water removed by the separation membrane (20).

Description

Dry air generating device and dry air generating system

[0001] The present disclosure relates to a dry air generating device and a dry air generating system.

[0002] A dry air generator generates dry air by removing water from a gas mixture such as air. The dry air generated by the dry air generator is used, for example, in dry stalls in lithium-ion battery manufacturing plants. For example, Patent Document 1 discloses a dry air generator having a honeycomb-structured dehumidifying rotor with a large number of through-holes.

[0003] In the dry air generating device disclosed in Patent Document 1, a gas mixture is passed through the passage holes of a dehumidifying rotor, causing the water contained in the gas mixture to be adsorbed onto the dehumidifying rotor, and heated regenerating air is passed through the passage holes of the dehumidifying rotor to desorb the water from the dehumidifying rotor.

[0004] Japanese Patent Application Laid-Open No. 2004-278943

[0005] However, the dry air generator described above consumes a large amount of energy to generate heated regeneration air, and CO ２ Emissions will increase.

[0006] Therefore, the present disclosure provides a method for producing dry air while also ２ The object of the present invention is to provide a dry air generating device that can simultaneously capture and collect

[0007] The dry air generating device according to the present disclosure is a device for generating CO from a mixed gas. ２ and a dry air generating device for generating dry air from which at least a portion of water has been removed, the dry air generating device comprising: ２ and a separation membrane removal unit for removing at least a portion of the water, ２ A condensation water removal section is provided on the surface with a high concentration.

[0008] According to the dry air generating device of the present disclosure, while generating dry air, ２ can be collected simultaneously.

[0009] Fig. 1 is a schematic diagram showing a dry air generating device according to an embodiment; Fig. 2 is another schematic diagram showing a dry air generating device according to an embodiment; Fig. 3 is a schematic diagram showing a dry air generating device according to another embodiment; Fig. 4 is a schematic diagram showing a dry air generating system according to an embodiment; Fig. 5 is a schematic diagram showing a dry air generating system according to another embodiment.

[0010] An example of an embodiment of the present disclosure will be described in detail below. In the following description, specific shapes, materials, directions, numerical values, etc. are examples for facilitating understanding of the present disclosure, and can be appropriately changed according to the application, purpose, specifications, etc.

[0011] [Dry Air Generating Apparatus] A dry air generating apparatus 10 as an example of an embodiment will be described with reference to FIGS. 1 and 2. FIG.

[0012] The dry air generating device 10 generates CO from a mixed gas such as air. ２ The dry air generated by the dry air generator 10 is used, for example, in dry stalls in lithium-ion battery manufacturing plants. The dry air generator 10 eliminates the need to pass heated regeneration air through the passage holes of the dehumidification rotor to desorb water from the dehumidification rotor, as in conventional dry air generators, and reduces CO₂ caused by energy consumption for heating. ２ Dry air can be generated while reducing the generation of

[0013] The dry air generator 10 is a device that supplies generated dry air to a space that is at least larger than a room in an average residence, such as a dry booth in a lithium-ion battery manufacturing factory. The manufacturing factory may also be a factory that manufactures electric double layer capacitors, organic electroluminescence (EL) displays, etc.

[0014] The dry air generator 10 includes a separation membrane 20, a housing 30, a first pipe 31, a second pipe 32, a third pipe 33, and a fourth pipe 34. The third pipe 33 is a CO ２ A recovery section 50 is provided.

[0015] The separation membrane 20 separates CO from the mixed gas.２ The housing 30 has an interior partitioned by a separation membrane 20. A first pipe 31 is connected to the housing 30 and sends the mixed gas to the separation membrane 20. A second pipe 32 is connected to the housing 30 and sends the mixed gas to the separation membrane 20. The second pipe 32 is connected to the housing 30 and sends the mixed gas to the separation membrane 20. ２ The dry air from which at least a part of the CO and water has been removed is sent to the third pipe 33, which is connected to the housing 30. ２ The third pipe 33 is also capable of passing water removed by the separation membrane 20. The fourth pipe 34 is a pipe that passes through the CO ２ It is connected to the space with high concentration and the removed water is drained. ２ The recovery section 50 is provided in the third pipe 33 .

[0016] In the dry air generating device 10, CO is extracted from the mixed gas sent from the first pipe 31. ２ and at least a portion of the water is removed, and the dry air is sent to the second pipe 32, and a high humidity and high concentration of CO ２ The gas containing the above is sent to the third pipe 33. The dry air is discharged from the second pipe 32.

[0017] The interior of the housing 30 is divided into upper and lower compartments by the separation membrane 20. Inside the housing 30, a guide plate 36 may be provided above the separation membrane 20 to guide the mixed gas sent from the first pipe 31 to the separation membrane 20.

[0018] The second pipe 32 is provided with a pump 42 for creating a negative pressure in the second pipe 32 and generating a pressure difference between the first pipe 31 and the second pipe 32. The third pipe 33 is provided with a pump 43 for creating a negative pressure in the third pipe 33 and generating a pressure difference between the first pipe 31 and the third pipe 33.

[0019] [Separation Membrane] A separation membrane 20 as an example of an embodiment will be described with reference to FIG.

[0020] The separation membrane 20 separates CO from the mixed gas passing through it. ２ and water preferentially permeate the separation membrane 20, so that CO is separated from the mixed gas. ２The separation membrane 20 is formed, for example, in a flat plate (sheet) shape, and is provided inside the housing 30 so as to divide the inside of the housing 30 into upper and lower sections. The mixed gas sent from the first pipe 31 comes into contact with the separation membrane 20 as it passes through the inside of the housing 30. During this contact, CO ２ and water permeate the separation membrane 20, but for example, nitrogen does not easily permeate the separation membrane 20. As a result, CO ２ The concentrations of CO2 and water decrease, generating dry air, which is then discharged through second pipe 32. Furthermore, the lower space inside housing 30 separated by separation membrane 20 (hereinafter referred to as the lower space) has a high concentration of CO2 and water that have permeated separation membrane 20. The gas that has permeated separation membrane 20 is discharged through third pipe 33, and the liquid inside housing 30 is discharged through fourth pipe 34. The liquid is mainly composed of water.

[0021] The separation membrane 20 separates the "space where dry air is discharged" and the "space where high humidity and high concentration CO2 are discharged" from the inside of the housing 30. ２ The present invention is not limited to the above embodiment, and may be applied to any other embodiments as long as the space is separated from the space into which the liquid is discharged.

[0022] The separation membrane 20 separates CO from the mixed gas. ２ The permeability of separation membrane 20 can be determined by quantitatively analyzing the gas before passing through separation membrane 20 and the gas after passing through separation membrane 20 using gas chromatography or the like to determine the amount of each gas component (nitrogen, oxygen, carbon dioxide, water) that passes through per unit time, and calculating the permeability coefficient of each gas component from the area and thickness of the membrane used and the partial pressure difference between the gases on the upstream and downstream sides of the membrane. When the permeability coefficient of nitrogen is taken as 1, the permeability coefficient of oxygen may be 2 to 4, the permeability coefficient of carbon dioxide may be 12 to 13, and the permeability coefficient of water may be 22 to 23.

[0023] The separation membrane 20 is a polymer membrane made of at least one selected from, for example, polytetrafluoroethylene, polyimide, and polydimethylsiloxane. ２ and H ２A membrane having a relatively high O permeability coefficient may be preferably used. Furthermore, the separation membrane 20 may be, for example, a molecular sieve membrane made of at least one material selected from carbon, ceramic, and MOF (metal organic framework). The molecular sieve membrane may be a free-standing membrane or may be disposed on the surface of a separate support (for example, a nonwoven fabric of fluororesin, a porous ceramic membrane, etc.). The molecular sieve membrane may be a membrane having a relatively high O permeability coefficient. ２ and H ２ In order to allow O to pass preferentially, the separation membrane 20 may be separated from nitrogen and oxygen in stages by passing the O through molecular sieve membranes with different pore sizes. ２ An ionic liquid having a high affinity with the ionic liquid, or a liquid in which monoethanolamine or the like is mixed with the ionic liquid as a solvent may be preferably used. The liquid membrane may be formed by coating the surface of a separate support (for example, a nonwoven fabric of a fluororesin, a porous ceramic membrane, or the like).

[0024] In the separation membrane 20, CO ２ CO molecules and water molecules pass through preferentially, and high humidity and high concentration CO ２ The gas containing CO is sent to the lower space of the housing 30. The separation membrane 20 separates the CO from the mixed gas in the housing 30. ２ On the other hand, the separation membrane 20 can remove a part of the high humidity and high concentration CO2 that has been removed and send the dry air to the second pipe 32. ２ The gas containing CO can be sent to the lower space of the housing 30. Since the gas that has permeated the separation membrane 20 has high humidity, condensation may occur on the surface of the separation membrane 20, which may reduce the permeability of the gas that permeates the separation membrane 20. ２ A condensation water removal section 21 is provided on the surface with a high concentration (hereinafter referred to as the lower surface).

[0025] [Condensed water removal section] The condensed water removal section 21 collects water. The condensed water removal section 21 is formed, for example, in a flat plate shape (sheet shape) and is provided below the separation membrane 20 so as to be integrated with the separation membrane 20. The condensed water removal section 21 is provided at an incline with respect to the horizontal direction. By arranging the condensed water removal section 21 at an incline with respect to the horizontal direction, the condensed water is more likely to move from the surface of the condensed water removal section 21 in the direction of gravity. This inclination can prevent the surfaces of the separation membrane 20 and the condensed water removal section 21 from being covered with condensed water, and the CO 2 that permeates the separation membrane 20 is reduced. ２ This suppresses the decrease in the amount of permeation.

[0026] The condensed water removal section 21 may be a section in which one surface of the separation membrane 20 has been subjected to a water-repellent treatment. The water-repellent treatment may be a surface fluorination treatment, a finely textured surface, or the like. The water-repellent treatment may also be a porous structure with fine pores or a mesh-like structure that allows air to pass through easily. Furthermore, the water-repellent treatment may be achieved by spraying water-repellent resin particles (water-repellent spray), coating with a water-repellent resin, or creating a water-repellent surface by using surface undulations. Because the condensed water removal section 21 needs to allow air that has passed through the separation membrane 20 to pass through, it is preferable that it be formed as thin as possible.

[0027] In the condensed water removal unit 21, water condenses on the surface of the condensed water removal unit 21, and the condensed water drips downward by gravity and is collected in the housing 30. ２ Water can be removed from gases containing

[0028] The condensation water removal unit 21 may also be provided on the wall surface of the lower space of the housing 30. This can improve the water-repellent effect of the lower space of the housing 30. Water that drips and collects on the bottom surface of the housing 30 is removed by the fourth pipe 34.

[0029] Separation Membrane (Another Embodiment) A separation membrane 60 as another example of the embodiment will be described with reference to FIG.

[0030] The separation membrane 60 separates CO from the mixed gas. ２and removes at least a portion of the water. Separation membrane 60 is formed, for example, in a tubular shape (hollow cylindrical shape). Separation membrane 60 is provided inside housing 30 so that the hollow portion of separation membrane 60 communicates with first pipe 31 and second pipe 32. The material, action, and effect of separation membrane 60 are similar to those of separation membrane 20, and therefore will not be described here.

[0031] In the separation membrane 60, CO ２ CO molecules and water molecules pass through preferentially, and high humidity and high concentration CO ２ The gas containing CO is sent to the outer peripheral surface of the separation membrane 60. The separation membrane 60 separates the CO from the mixed gas in the housing 30. ２ The separation membrane 60 can remove a part of the high humidity and high concentration CO2 from the air and send the dry air to the second pipe 32. ２ The gas containing CO can be sent into the housing 30. Since the gas that has permeated the separation membrane 60 has high humidity, condensation may occur on the outer peripheral surface of the separation membrane 60, which may reduce the permeability of the gas that permeates the separation membrane 60. ２ A condensation water removal section 61 is provided on the surface with a high concentration (hereinafter referred to as the outer peripheral surface).

[0032] The condensed water removal section 61 removes water. The condensed water removal section 61 is provided, for example, on the outer peripheral surface of the separation membrane 60 so as to be integrated with the separation membrane 60. The condensed water removal section 61 may be provided at an incline with respect to the horizontal direction, like the separation membrane 60, or may be provided parallel to the vertical direction. By arranging the condensed water removal section 61 at an incline with respect to the horizontal direction, the condensed water is more likely to move from the surface of the condensed water removal section 61 in the direction of gravity. The inclination can prevent the surfaces of the separation membrane 60 and the condensed water removal section 61 from being covered with condensed water, and the CO 2 that permeates the separation membrane 60 is reduced. ２ The material, action, and effect of the condensed water removal portion 61 are the same as those of the condensed water removal portion 21, and therefore a description thereof will be omitted.

[0033] [CO ２ Recovery section] Referring again to FIG. ２ The recovery unit 50 will now be described.

[0034] CO ２The recovery section 50 recovers CO from the gas. ２ More specifically, CO ２ In the recovery section 50, CO is extracted from the gas flowing through the third pipe 33. ２ Collect and reuse.

[0035] CO ２ The recovery unit 50 utilizes the partial pressure difference to recover CO ２ It may also be an apparatus using a membrane separation method to recover CO ２ The recovery unit 50 may be a device that uses a chemical absorption method that uses an amine solution such as monoethanolamine. ２ The recovery unit 50 may be a device that uses a physical absorption method that uses an absorption liquid such as methanol or polyethylene glycol. ２ The recovery unit 50 may be a device that uses an adsorption method using a porous body or a solid adsorbent material obtained by impregnating a porous body with liquid amine or the like. ２ The recovery section 50 is a CO2 recovery system that uses pressure swing or thermal desorption by utilizing exhaust heat from the device. ２ may be collected.

[0036] CO ２ The recovery unit 50 is ２ CO ２ When extracting it as a compound, it is bubbled in an alkaline aqueous solution and the precipitated Li ２ CO ３ Carbonates such as may be recovered.

[0037] CO ２ CO recovered by the recovery unit 50 ２ The carbon dioxide may be used for CCS (Carbon dioxide Capture and Storage) such as enhanced oil recovery, as dry ice, as a raw material for carbonated drinks, as a CO2 laser, for promoting plant growth in a plant factory, as a refrigerant, as a raw material for chemical products such as plastics and biofuels, as a neutralizing agent, as a raw material for foam molding of polymer materials, and the like.

[0038] [Dry Air Generating System] A dry air generating system 100 as an example of an embodiment will be described with reference to FIG.

[0039] The dry air generation system 100 includes a plurality of dry air generators 10 and an enclosed space 110 in which a dry environment is ensured. The dry air generation system 100 is a system that sends dry air to the enclosed space 110.

[0040] The enclosed space 110 is, for example, an assembly machine drive space in a lithium-ion battery manufacturing factory, and is a space isolated from the outside air where a dry environment is required. Note that the enclosed space of the present disclosure may also be used in manufacturing factories for products where moisture in the air is a problem in the manufacturing process, such as electric double layer capacitors and organic electroluminescence (EL).

[0041] In the dry air generation system 100, multiple dry air generators 10 are connected in series. More specifically, in the dry air generation system 100, the first dry air generator 10A and the second dry air generator 10B are connected by a pipe 15, the second dry air generator 10B and the third dry air generator 10C are connected by a pipe 16, and the second pipe 32 of the third dry air generator 10 is connected to the sealed space 110. The pipe 15 serves as the second pipe 32 of the first dry air generator 10A and the first pipe 31 of the second dry air generator 10B. The pipe 16 serves as the second pipe 32 of the second dry air generator 10B and the first pipe 31 of the third dry air generator 10C. The pipes 15 and 16 may be composed of multiple pipes. Although the third piping 33 and the fourth piping 34 are not shown in Figure 4, it is preferable that they be provided in the first dry air generation device 10A, the second dry air generation device 10B, and the third dry air generation device 10C, respectively.

[0042] According to the dry air generation system 100, dry air of the intended composition can be generated by passing the air through multiple dry air generators 10. Furthermore, according to the dry air generation system 100, the humidity in the enclosed space 110 can be reduced to the intended level. In other words, the dew point temperature in the enclosed space 110 can be further reduced.

[0043] Dry Air Generation System (Another Embodiment) A dry air generation system 200 as another example of the embodiment will be described with reference to FIG.

[0044] The dry air generation system 200 includes a plurality of dry air generators 10 and an enclosed space 210 in which a dry environment is ensured. The dry air generation system 200 is a system that sends dry air to the enclosed space 210.

[0045] The sealed space 210 is similar to the sealed space 110, and therefore a description thereof will be omitted. In the dry air generation system 200, a plurality of dry air generators 10 are connected in parallel. More specifically, in the dry air generation system 100, the first pipe 31 of the first dry air generator 10, the first pipe 31 of the second dry air generator 10, and the first pipe 31 of the third dry air generator 10 are connected, and the second pipe 32 of the first dry air generator 10, the second pipe 32 of the second dry air generator 10, and the second pipe 32 of the third dry air generator 10 are connected to the sealed space 210. Note that although the third pipe 33 and the fourth pipe 34 are not shown in FIG. 5 , they are preferably provided in the first dry air generator, the second dry air generator, and the third dry air generator, respectively.

[0046] According to the dry air generation system 200, since a plurality of dry air generators 10 are connected in parallel, dry air can be generated while efficiently reducing CO2 emissions. Furthermore, the dry air generation system 200 can accommodate a large-capacity enclosed space 110.

[0047] [Summary] The present disclosure is further explained by the following embodiments. Configuration 1: CO from mixed gas ２ A dry air generating apparatus for generating dry air from which at least a portion of CO and water have been removed, the apparatus comprising: ２ and a separation membrane for removing at least a portion of the water, ２A dry air generator in which a condensation water removal section is provided on the surface with a high concentration. Configuration 2: The dry air generator according to configuration 1, in which the condensation water removal section 21 is provided at an angle to the horizontal direction or parallel to the vertical direction. Configuration 3: The dry air generator according to configuration 2, in which the condensation water removal section has a porous structure or is mesh-like. Configuration 4: The dry air generator according to configuration 1, comprising: a housing whose interior is divided by the separation membrane; a first pipe connected to the housing and sending the mixed gas to the separation membrane; and a second pipe connected to the housing and sending the mixed gas to the separation membrane. ２ a second pipe to which dry air from which water has been removed is sent; and a second pipe connected to the housing, which is connected to the dry air from which water has been removed by the separation membrane. ２ and a third pipe to which the air is sent. ２ The dry air generating device according to the present invention, wherein the condensation water removing unit is provided on a wall surface of a space where the concentration is high. ２ The dry air generator further comprises a fourth pipe connected to a space with a high concentration, through which water removed by the condensation water removal unit is drained.Configuration 7: The dry air generator according to Configuration 6, wherein the separation membrane is shaped like a sheet or a tube.Configuration 8: The dry air generator according to Configuration 7, wherein the separation membrane is made of a material selected from the group consisting of a polymer membrane containing at least a portion of polytetrafluoroethylene, polyimide, or polydimethylsiloxane, a molecular sieve membrane made of carbon, ceramic, or MOF, an ionic liquid, and a liquid using an ionic liquid as a solvent.Configuration 9: The dry air generator according to Configuration 8, wherein the third pipe is provided with a CO ２A dry air generating apparatus, comprising: a collecting section; a dry air generating system, comprising: the dry air generating apparatus according to any one of the first to ninth embodiments, connected in series or in parallel;

[0048] It should be noted that the present disclosure is not limited to the above-described embodiments and their variations, and it goes without saying that various modifications and improvements are possible within the scope of the matters described in the claims of the present application.

[0049] 10 Dry air generating device, 20 Separation membrane, 21 Separation membrane, 30 Housing, 31 First pipe, 32 Second pipe, 33 Third pipe, 42 Pump, 43 Pump, 50 CO ２ Collection section 60: Condensation water removal section, 61: Condensation water removal section, 100: Dry air generation system, 110: Sealed space, 200: Dry air generation system, 210: Sealed space

Claims

1. CO from a gas mixture ２ and a dry air generating device for generating dry air from which at least a portion of water has been removed, the dry air generating device comprising: ２ and a separation membrane for removing at least a portion of the water, ２ A dry air generating device in which a condensation water removal section is provided on the surface with a high concentration.

2. A dry air generating device according to claim 1, wherein the condensation water removing section is provided at an angle to the horizontal direction or parallel to the vertical direction.

3. A dry air generating device according to claim 2, wherein the condensation water removing section has a porous structure or a mesh structure.

4. The dry air generating device according to claim 1, comprising: a housing whose interior is partitioned by the separation membrane; a first pipe connected to the housing and sending the mixed gas to the separation membrane; and a second pipe connected to the housing and separating the mixed gas from the separation membrane. ２ a second pipe to which dry air from which water has been removed is sent; and a second pipe connected to the housing, which is connected to the dry air from which water has been removed by the separation membrane. ２ a third pipe through which the dry air is delivered.

5. The dry air generating device according to claim 4, wherein the CO of the space partitioned by the separation membrane of the housing ２ The dry air generating device, wherein the condensation water removing unit is provided on a wall surface of a space where the concentration is high.

6. The dry air generating device according to claim 5, wherein the CO of the space partitioned by the separation membrane of the housing ２ The dry air generating device further comprises a fourth pipe connected to the space where the concentration is high, through which the water removed by the condensation water removing unit is drained.

7. The dry air generating device according to claim 6, wherein the separation membrane is in the form of a sheet or a tube.

8. A dry air generator according to claim 7, wherein the separation membrane is made of a polymer membrane made of at least one material selected from the group consisting of polytetrafluoroethylene, polyimide, and polydimethylsiloxane.

9. The dry air generating device according to claim 8, wherein the third pipe is provided with a CO ２ A dry air generating device provided with a recovery section.

10. A dry air generating system in which the dry air generating device according to any one of claims 1 to 9 is connected in series or parallel.

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