WO2024095618A1 - 空気精製装置及び空気精製方法 - Google Patents

空気精製装置及び空気精製方法 Download PDF

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Publication number
WO2024095618A1
WO2024095618A1 PCT/JP2023/033403 JP2023033403W WO2024095618A1 WO 2024095618 A1 WO2024095618 A1 WO 2024095618A1 JP 2023033403 W JP2023033403 W JP 2023033403W WO 2024095618 A1 WO2024095618 A1 WO 2024095618A1
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Prior art keywords
adsorption
air purification
path
regeneration
opening
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English (en)
French (fr)
Japanese (ja)
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智雄 大前
拓実 石丸
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Nippon Sanso Holdings Corp
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Nippon Sanso Holdings Corp
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Priority to CN202380075477.3A priority Critical patent/CN120152776A/zh
Priority to JP2024554300A priority patent/JP7678236B2/ja
Priority to KR1020257012469A priority patent/KR102886874B1/ko
Publication of WO2024095618A1 publication Critical patent/WO2024095618A1/ja
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0462—Temperature swing adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0438—Cooling or heating systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0446—Means for feeding or distributing gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40003—Methods relating to valve switching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40035—Equalization
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Definitions

  • the present invention relates to an air purification device and an air purification method.
  • Patent Document 1 discloses this type of air purification device.
  • the air purification device described in Patent Document 1 is equipped with two adsorption towers.
  • an air purification process is performed in one adsorption tower to purify the raw air, and a regeneration process is performed in the other adsorption tower to regenerate the adsorbent.
  • the above-mentioned air purification process and regeneration process are alternately switched between the two adsorption towers, allowing the air to be continuously purified as a whole.
  • the oxygen concentration of the purified air may fluctuate before and after the switch.
  • the oxygen concentration of the purified air purified in one adsorption tube immediately after switching from regeneration to air purification may differ from the oxygen concentration of the purified air purified in the other adsorption tube, which was performing air purification until just before the switch.
  • One of the adsorption tubes that is switched from regeneration processing to air purification processing is equalized in pressure with the other adsorption tube that is performing the air purification processing, for example by being pressurized just before the switch. This allows the execution of the air purification processing to be continuously switched from the other adsorption tube to one of the adsorption tubes.
  • adsorption of oxygen and nitrogen to the adsorbent or desorption from the adsorbent may occur in one of the adsorption tubes.
  • fluctuations in the oxygen concentration before and after the above-mentioned switch may occur.
  • the present invention aims to provide an air purification device and an air purification method that can suppress fluctuations in the oxygen concentration of purified air that occur before and after switching when air purification and regeneration processes are alternately switched between two adsorption tubes.
  • An air purifying apparatus comprises: (1) 1. An air purification apparatus for purifying a feed air by removing impurities from the feed air by a temperature swing adsorption method, comprising: two adsorption columns each filled with an adsorbent capable of adsorbing the impurities, and capable of alternately performing an air purification process for purifying the raw air using the adsorbent and a regeneration process for regenerating the adsorption capacity of the adsorbent;
  • the air purification device is such that one of the two adsorption cylinders in which the regeneration process is being performed is switched to perform the air purification process after a flow purge is performed in a pressure equalization state with the other of the two adsorption cylinders in which the air purification process is being performed.
  • An air purifying apparatus comprises: (2) a regeneration gas supply path capable of supplying a regeneration gas to the two adsorption columns in the regeneration treatment; an exhaust path capable of exhausting exhaust gas in a state in which the impurities desorbed from the adsorbent in the regeneration process are mixed with the regeneration gas from the two adsorption columns;
  • This is an air purification device as described in (1) above, wherein in the regeneration process, before the one adsorption tube is brought into a pressure-equal state with the other adsorption tube, the exhaust gas is exhausted from the one adsorption tube through the exhaust path, and after the one adsorption tube is brought into a pressure-equal state with the other adsorption tube, the flow purge is performed in which a flow purge gas is exhausted from the one adsorption tube through the exhaust path.
  • An air purifying apparatus comprises: (3) a flow rate adjusting unit capable of adjusting a flow rate is provided in the exhaust path, In the air purification apparatus according to (2) above, the one adsorption column is brought into a pressure equal state with the other adsorption column by operating the flow rate adjustment unit.
  • An air purifying apparatus comprises: (4)
  • the exhaust path is an exhaust gas path capable of discharging the exhaust gas from the one of the adsorption columns; a flow purge gas passage capable of discharging the flow purge gas from the one of the adsorption columns when the flow purge is performed,
  • the flow rate adjusting unit is A first opening/closing valve provided in the exhaust gas path; a second opening/closing valve provided in the flow purge gas path and having a flow rate in an open state smaller than that of the first opening/closing valve;
  • This is an air purification device as described in (3) above, in which the one adsorption column is made to be in a pressure equal state with the other adsorption column by manipulating the opening and closing states of the first opening and closing valve and the second opening and closing valve.
  • a method for purifying air according to a second aspect of the present invention comprises the steps of: (5) 1.
  • a method for purifying feed air by removing impurities from the feed air using a temperature swing adsorption method comprising: a continuous purification process in which an air purification process for purifying the raw air using an adsorbent capable of adsorbing the impurities and a regeneration process for regenerating the adsorption capacity of the adsorbent are alternately performed by two adsorption columns filled with the adsorbent,
  • This is an air purification method, in which, in the continuous purification process, one of the two adsorption columns in which the regeneration process is being performed is switched to perform the air purification process after a flow purge is performed in a pressure equalization state with the other of the two adsorption columns in which the air purification process is being performed.
  • a method for purifying air comprises the steps of: (6) a regeneration gas supply path capable of supplying a regeneration gas to the two adsorption columns in the regeneration treatment; an exhaust path capable of exhausting exhaust gas in a state in which the impurities desorbed from the adsorbent in the regeneration process are mixed with the regeneration gas from the two adsorption columns;
  • This is an air purification method described in (5) above, in which, in the regeneration process, before the one adsorption tube is brought into a pressure-equal state with the other adsorption tube, the exhaust gas is exhausted from the one adsorption tube through the exhaust path, and after the one adsorption tube is brought into a pressure-equal state with the other adsorption tube, the flow purge is performed in which a flow purge gas is exhausted from the one adsorption tube through the exhaust path.
  • a method for purifying air comprises the steps of: (7) a flow rate adjusting unit capable of adjusting a flow rate is provided in the exhaust path, The air purification method according to (6) above, wherein the one adsorption column is brought into a pressure equal state with the other adsorption column by operating the flow rate adjustment unit.
  • a method for purifying air comprises the steps of: (8)
  • the exhaust path is an exhaust gas path capable of discharging the exhaust gas from the one of the adsorption columns; a flow purge gas passage capable of discharging the flow purge gas from the one of the adsorption columns when the flow purge is performed,
  • the flow rate adjusting unit is A first opening/closing valve provided in the exhaust gas path; a second opening/closing valve provided in the flow purge gas path and having a flow rate in an open state smaller than that of the first opening/closing valve;
  • the present invention provides an air purification device and an air purification method that can suppress fluctuations in the oxygen concentration of purified air that occur before and after switching when air purification and regeneration processes are alternately switched between two adsorption columns.
  • FIG. 1 is a diagram showing an air purification device according to one embodiment of the present invention
  • 2 is a flowchart showing an example of a regeneration process executed in the adsorption column shown in FIG. 1 .
  • FIG. 3 is an explanatory diagram showing the air purification apparatus in a state in which the pre-pressure equalization step shown in FIG. 2 is being performed.
  • FIG. 3 is an explanatory diagram showing the air purification device in a state in which the pressure equalization process shown in FIG. 2 is being performed.
  • FIG. 3 is an explanatory diagram showing the air purification apparatus in a state in which a flow purge process as a post-pressure equalization process shown in FIG. 2 is being performed.
  • 3 is a diagram showing a variation of a method for performing the pressure equalization step shown in FIG. 2.
  • Fig. 1 is a system diagram showing the configuration of an air purification device 1 as one embodiment of the air purification device according to the present invention.
  • the air purification device 1 of this embodiment includes two adsorption columns 2A and 2B, a feed air introduction path L1, a purified air discharge path L2, a regeneration gas supply path L3, a heating means 3, an exhaust path L4, and a flow rate adjustment unit 4.
  • the air purification device 1 of this embodiment is an apparatus for purifying feed air by removing impurities such as water and carbon dioxide from the feed air by a temperature swing adsorption (TSA) method.
  • TSA temperature swing adsorption
  • the two adsorption columns 2A and 2B are cylindrical adsorption vessels that are heat-resistant and pressure-resistant. There are no particular limitations on the shape of the vessels.
  • Each of the two adsorption columns 2A and 2B is filled with an adsorbent capable of adsorbing water and carbon dioxide as impurities in the raw air.
  • the adsorbent capable of adsorbing water may be, for example, activated alumina.
  • the adsorbent capable of adsorbing carbon dioxide may be, for example, synthetic zeolite.
  • Each of the two adsorption columns 2A and 2B may also be filled with an adsorbent capable of adsorbing impurities other than water and carbon dioxide in the raw air.
  • branched feed air introduction paths L1A and L1B which branch off from feed air introduction path L1, are connected to one end of adsorption column 2A and adsorption column 2B, respectively. This allows raw air before purification to be supplied to adsorption columns 2A and 2B via feed air introduction path L1.
  • the other ends of the adsorption columns 2A and 2B are connected to branched purified air outlet paths L2A and L2B, respectively, which branch off from the purified air outlet path L2. This allows the purified air from which impurities such as water and carbon dioxide have been removed in the adsorption columns 2A and 2B to be extracted via the purified air outlet path L2 and supplied to the outside from the adsorption columns 2A and 2B.
  • the branched raw air introduction paths L1A, L1B are provided with on-off valves V1A, V1B, respectively.
  • the branched purified air discharge paths L2A, L2B are provided with on-off valves V2A, V2B, respectively.
  • the regeneration gas supply path L3 is connected to the purified air outlet path L2, and the other end is connected to the branched regeneration gas supply paths L3A and L3B.
  • the branched regeneration gas supply path L3A is on the branched purified air outlet path L2A, and is connected between the other end of the adsorption column 2A and the on-off valve V2A.
  • the branched regeneration gas supply path L3B is on the branched purified air outlet path L2B, and is connected between the other end of the adsorption column 2B and the on-off valve V2B.
  • a portion of the purified air is supplied as regeneration gas from the purified air discharge path L2 to the regeneration gas supply path L3, and the regeneration gas can be supplied to the adsorption columns 2A and 2B via the regeneration gas supply path L3.
  • the branched regeneration gas supply paths L3A and L3B are provided with on-off valves V3A and V3B, respectively.
  • on-off valves V3A and V3B By controlling the on-off state of on-off valves V3A and V3B, regeneration gas can be supplied to only one of adsorption column 2A and adsorption column 2B. For example, when regeneration gas is to be supplied only to adsorption column 2B, on-off valve V3B is opened and on-off valve V3A is closed. Also, when regeneration gas is to be supplied only to adsorption column 2A, on-off valve V3B is closed and on-off valve V3A is opened.
  • the heating means 3 is provided on the regeneration gas supply path L3.
  • the heating means 3 heats the supplied regeneration gas to warm it. Therefore, the temperature of the regeneration gas supplied from the regeneration gas supply path L3 to the adsorption columns 2A and 2B is high. In this way, by supplying the heated regeneration gas to the adsorption columns 2A and 2B, the adsorbent is heated by the regeneration gas, and the adsorbent can be heated and regenerated.
  • a branch exhaust path L4A is connected on the branch feed air introduction path L1A between one end of the adsorption tube 2A and the on-off valve V1A. Also, a branch exhaust path L4B is connected on the branch feed air introduction path L1B between one end of the adsorption tube 2B and the on-off valve V1B.
  • Branch exhaust path L4A and branch exhaust path L4B are connected midway to form exhaust path L4.
  • Exhaust path L4 allows the exhaust gas generated in adsorption tube 2A and adsorption tube 2B to be exhausted to the outside.
  • the "exhaust gas” referred to here means a gas in which impurities desorbed from the adsorbent are mixed with the regeneration gas.
  • the branch exhaust paths L4A and L4B are provided with on-off valves V4A and V4B, respectively.
  • the exhaust gas generated in the adsorption columns 2A and 2B can be exhausted to the outside.
  • the on-off valve V4B is opened and the on-off valve V4A is closed.
  • the on-off valve V4B is closed and the on-off valve V4A is opened.
  • the on-off valves V1A, V2A, V3B, and V4B are opened, and the on-off valves V1B, V2B, V3A, and V4A are closed.
  • the on-off valves V1A, V2A, V3B, and V4B are closed, and the on-off valves V1B, V2B, V3A, and V4A are opened.
  • the air purification device 1 is equipped with two adsorption columns 2A and 2B that can alternately perform air purification and regeneration processes.
  • the exhaust path L4 is provided with a flow rate adjustment unit 4 capable of adjusting the flow rate. More specifically, the exhaust path L4 of this embodiment includes an exhaust gas path L41 and a flow purge gas path L42.
  • the exhaust gas path L41 is a path capable of exhausting exhaust gas from one of the adsorption tubes in which regeneration processing is being performed.
  • the flow purge gas path L42 is a path capable of exhausting flow purge gas from one of the adsorption tubes in which regeneration processing is being performed.
  • the exhaust gas path L41 is provided with an opening and closing valve V41.
  • the flow purge gas path L42 is provided with an opening and closing valve V42 whose flow rate in the open state is smaller than that of the opening and closing valve V41.
  • the flow rate adjustment unit 4 of this embodiment is configured to include the above-mentioned opening and closing valve V41 and opening and closing valve V42.
  • the on-off valve V41 will be referred to as the "first on-off valve V41” and the on-off valve V42 will be referred to as the "second on-off valve V42".
  • one of the adsorption cylinders undergoing regeneration processing is made to be in a pressure-equal state with the other adsorption cylinder undergoing air purification processing by operating the flow rate adjustment unit 4. More specifically, in this embodiment, one of the adsorption cylinders undergoing regeneration processing is made to be in a pressure-equal state with the other adsorption cylinder undergoing air purification processing by operating the on-off states of the first on-off valve V41 and the second on-off valve V42.
  • the configurations of the above-mentioned opening and closing valves V1A, V1B, V2A, V2B, V3A, V3B, V4A, and V4B, the first opening and closing valve V41, and the second opening and closing valve V42 are not particularly limited. These opening and closing valves may be configured, for example, as air-operated valves, solenoid valves, needle valves, and the like. In this embodiment, as an example, the opening and closing valves V1A, V1B, V2A, V2B, V3A, V3B, V4A, and V4B, and the first opening and closing valve V41 are configured as air-operated valves. Also, in this embodiment, as an example, the second opening and closing valve V42 is configured as a needle valve.
  • Air purification method using the above-mentioned air purification device 1 will be described as one embodiment of the air purification method according to the present invention.
  • adsorption columns 2A and 2B are connected in parallel, and an air purification process for purifying raw air is performed in one adsorption column, and a regeneration process for regenerating the adsorbent is performed in the other adsorption column.
  • the on-off valves V1A, V2A, V3B, and V4B are opened, and the on-off valves V1B, V2B, V3A, and V4A are closed.
  • the raw air supplied from the raw air inlet path L1 is supplied to the adsorption column 2A via the branched raw air inlet path L1A.
  • the adsorbent in the adsorption column 2A removes impurities such as water and carbon dioxide from the raw air at room temperature to generate purified air.
  • the impurities such as water and carbon dioxide are adsorbed by the adsorbent.
  • the purified air is supplied to the outside via the branched purified air outlet path L2A and the purified air outlet path L2.
  • Regeneration process On the other hand, while the purified air is being supplied to the outside from the purified air discharge line L2, a part of the purified air is supplied as regeneration gas via the regeneration gas supply line L3 to the heating means 3.
  • the heating means 3 heats the supplied regeneration gas, and supplies the heated regeneration gas to the adsorption column 2B via the regeneration gas supply line L3 and the branch regeneration gas supply line L3B.
  • the heated regeneration gas heats the adsorbent in adsorption tube 2B to, for example, 100 to 300°C, causing impurities such as water and carbon dioxide to be desorbed from the adsorbent, and regenerating the adsorption capacity of the adsorbent.
  • the desorbed impurities mix with the regeneration gas and become exhaust gas, which is exhausted to the outside via branch exhaust path L4B and exhaust path L4.
  • air purification processing can be performed in adsorption column 2A, and regeneration processing can be performed in adsorption column 2B.
  • the on-off valves V1B, V2B, V3A, and V4A are opened, and the on-off valves V1A, V2A, V3B, and V4B are closed. This allows the system to switch to a state in which regeneration processing is performed in adsorption column 2A and air purification processing is performed in adsorption column 2B. By alternately switching between these, the air can be purified continuously overall.
  • FIG. 2 is a flow chart showing an example of the regeneration process executed in the adsorption column 2B.
  • the regeneration process shown in FIG. 2 is being performed in adsorption column 2B.
  • the regeneration process in adsorption column 2B includes a pre-pressure equalization step S1, a pressure equalization step S2, and a flow purge step S3 as a post-pressure equalization step.
  • FIG. 3 is an explanatory diagram showing the state in which the pre-pressure equalization step S1 is being performed.
  • FIG. 4 is an explanatory diagram showing the state in which the pressure equalization step S2 has been performed from the state shown in FIG. 3.
  • FIG. 5 is an explanatory diagram showing the state in which the flow purge step S3 as a post-pressure equalization step is being performed from the state shown in FIG. 4.
  • the pre-pressure equalization process S1 includes a heating regeneration process S1a and a cooling process S1b. Also, as shown in FIG. 2, the pre-pressure equalization process S1 may further include a batch purge process S1c in addition to the heating regeneration process S1a and the cooling process S1b.
  • the heating regeneration step S1a is performed by heating the adsorbent by supplying the heated regeneration gas to the adsorption column 2B as described above.
  • the impurities adsorbed to the adsorbent at room temperature in the air purification process are desorbed from the adsorbent by heating the adsorbent in the heating regeneration step S1a. This allows the adsorption capacity of the adsorbent to be regenerated.
  • the impurities desorbed from the adsorbent are mixed with the regeneration gas and become exhaust gas, which is exhausted from the exhaust path L4.
  • the exhaust gas is exhausted through the exhaust gas path L41 of the exhaust path L4.
  • the first opening/closing valve V41 provided in the exhaust gas path L41 is opened, and the second opening/closing valve V42 provided in the flow purge gas path L42 is closed.
  • the regeneration gas a part of the purified air purified in the adsorption column 2A may be used as the regeneration gas as in this embodiment, but another gas may also be used as the regeneration gas.
  • the cooling step S1b is performed, for example, by flowing regeneration gas at room temperature into the adsorption column 2B as a cooling gas. This allows the adsorbent heated by the heating regeneration step S1a and the adsorption column 2B filled with this adsorbent to be cooled for the air purification process performed at room temperature after the regeneration process. As shown in FIG. 3, the cooling gas used in the cooling step S1b is also exhausted from the exhaust path L4. In this cooling step S1b, the cooling gas is exhausted through the exhaust gas path L41 of the exhaust path L4, similar to the above-mentioned heating regeneration step S1a.
  • the first opening and closing valve V41 provided in the exhaust gas path L41 is opened, and the second opening and closing valve V42 provided in the flow purge gas path L42 is closed.
  • the cooling gas the regeneration gas may be used as in this embodiment, but another gas may also be used as the cooling gas.
  • the batch purge process S1c is performed by repeatedly varying the internal pressure of the adsorption column 2B between a low pressure state and a high pressure state.
  • the internal pressure of the adsorption column 2B may be varied, for example, between atmospheric pressure (0.1 MPa) and 0.7 MPa.
  • the batch purge process S1c may be performed, for example, by operating the opening and closing states of the opening and closing valves V4A and V4B. As shown in FIG. 3, the batch purge gas used in the batch purge process S1c is also exhausted from the exhaust path L4.
  • the batch purge gas is exhausted through the exhaust gas path L41 of the exhaust path L4, similar to the above-mentioned heating regeneration process S1a and cooling process S1b. That is, in the batch purge step S1c in the pre-pressure equalization step S1, the first opening/closing valve V41 provided in the exhaust gas path L41 is opened, and the second opening/closing valve V42 provided in the flow purge gas path L42 is closed.
  • the batch purge gas supplied to the adsorption tube 2B in the batch purge step S1c for example, regeneration gas at room temperature may be used as in the cooling step S1b described above, but another gas may also be used as the batch purge gas.
  • the heating regeneration process S1a, the cooling process S1b, and the batch purge process S1c are performed. Also, as described above, in the pre-pressure equalization process S1, the gases (regeneration gas, cooling gas, and batch purge gas) used in each of the heating regeneration process S1a, the cooling process S1b, and the batch purge process S1c are exhausted through the exhaust gas path L41 of the exhaust path L4 (see FIG. 3).
  • the pressure equalization step S2 is performed.
  • purified air purified by the adsorption tube 2A is supplied to the adsorption tube 2B after the pre-pressure equalization step S1 is performed, and the pressure is equalized with the adsorption tube 2A in which the air purification process is being performed.
  • the pressure equalization step S2 of this embodiment is performed by manipulating the opening and closing states of the first opening and closing valve V41 and the second opening and closing valve V42. That is, the pressure equalization step S2 is performed by closing the first opening and closing valve V41 provided in the exhaust gas path L41 and opening the second opening and closing valve V42 provided in the flow purge gas path L42.
  • the flow rate in the flow purge gas path L42 when the second opening and closing valve V42 is open is smaller than the flow rate in the exhaust gas path L41 when the first opening and closing valve V41 is open. Therefore, even if the second opening/closing valve V42 is open in the flow purge gas path L42 that is connected to the adsorption column 2B, the adsorption column 2B is pressurized by being connected to the adsorption column 2A in which the air purification process is being performed, and the pressure is equalized with that of the adsorption column 2A.
  • the exhaust path L4 is provided with an exhaust gas path L41 and a flow purge gas path L42, and a first opening/closing valve V41 is provided in the exhaust gas path L41, and a second opening/closing valve V42 is provided in the flow purge gas path L42, but this configuration is not limited.
  • the configuration is not particularly limited.
  • the exhaust gas path L41 and the flow purge gas path L42 are designed to have approximately equal cross-sectional areas and have approximately equal flow rates. Therefore, in this embodiment, the flow rates in the exhaust gas path L41 and the flow purge gas path L42 are adjusted by operating the opening and closing states of the first opening and closing valve V41 and the second opening and closing valve V42 as described above, thereby achieving pressure equalization in the adsorption columns 2A and 2B.
  • the pressure equalization in the adsorption columns 2A and 2B may be achieved by other means.
  • the flow purge gas path L42 may be provided with a narrow diameter section, or the flow purge gas path L42 may be provided with different flow rates, and the above-mentioned pressure equalization in the adsorption columns 2A and 2B may be achieved by operating a switching valve that can switch between the exhaust gas path L41 and the flow purge gas path L42.
  • the exhaust gas path L41 and the flow purge gas path L42 of this embodiment differ only in some of the branch paths arranged in parallel, and the other parts are common, but this configuration is not limited to this.
  • the exhaust gas path L41 and the flow purge gas path L42 may be configured as completely separate paths.
  • the configuration of the exhaust path L4 can be simplified and the exhaust path L4 can be prevented from becoming complicated.
  • the flow purge process S3 is carried out as a post-pressure equalization process.
  • a flow purge is carried out in which the flow purge gas flows into the adsorption column 2B while maintaining the two adsorption columns 2A and 2B in an equal pressure state.
  • the flow purge gas is exhausted through the flow purge gas path L42 of the exhaust path L4. Purified air purified by the adsorption column 2A is used as the flow purge gas.
  • the purified air purified by the adsorption tube 2A that was contained in the adsorption tube 2B when the pressure equalization step S2 was performed can be exhausted through the flow purge gas path L42 before switching to the air purification process.
  • the purified air purified by the adsorption tube 2A can be supplied to the adsorption tube 2B while maintaining the two adsorption tubes 2A and 2B in an equalized state. This makes it possible to reduce the fluctuation in oxygen concentration before and after the switch caused by the above-mentioned pressure equalization step S2.
  • the flow purge performed in the flow purge process S3 may be performed, for example, so that the fluctuation in oxygen concentration before and after the above-mentioned switching is within ⁇ 1%. To achieve this, it is preferable that the flow purge is performed, for example, at a space velocity of 5 to 10 times/hour with respect to the volume of the adsorption column 2B.
  • the time for performing the flow purge may be, for example, 10 to 120 minutes.
  • the adsorption cylinder 2B is switched to perform the air purification process immediately after the flow purge step S3 has been performed.
  • one of the two adsorption cylinders 2A, 2B, which is undergoing regeneration processing is switched to perform the air purification process after a flow purge is performed in a pressure equalization state with the other adsorption cylinder 2A, which is undergoing air purification processing.
  • the regeneration process of the adsorption cylinder 2B is completed, and the regeneration process of the adsorption cylinder 2A is started.
  • the regeneration process of the adsorption cylinder 2A is the same as the regeneration process of the adsorption cylinder 2B described above.
  • the flow purge step S3 is preferably performed immediately before switching from the regeneration process to the air purification process. Therefore, the adsorption tube 2B may be in a standby state for a certain period of time after the above-mentioned pressure equalization step S2 is completed. If this standby state is prolonged, for example, impurities may be desorbed from the inner surface of the adsorption tube 2B. Therefore, for example, if the standby state time exceeds a predetermined time, the batch purge step S1c of the pre-pressure equalization step S1 and the pressure equalization step S2 may be performed again before performing the above-mentioned flow purge step S3.
  • adsorption cylinder 2B is switched to perform air purification processing immediately after the flow purge process S3 is performed, and both adsorption cylinders 2A and 2B may perform air purification processing immediately after this switching.
  • a combined process in which air purification processing is performed simultaneously in the two adsorption cylinders 2A and 2B may be performed for a predetermined time. In this way, continuous purification of air can be performed more reliably.
  • the time for performing the combined process is not particularly limited, but may be, for example, several tens of seconds to several tens of minutes.
  • adsorption cylinder 2A is switched from air purification processing to regeneration processing.
  • the exhaust path L4 is provided with a flow rate adjustment unit 4 capable of adjusting the flow rate, and one adsorption tube 2B is made equal in pressure to the other adsorption tube 2A by operating the flow rate adjustment unit 4.
  • the exhaust path L4 includes an exhaust gas path L41 and a flow purge gas path L42.
  • a first opening/closing valve V41 is provided in the exhaust gas path L41, and a second opening/closing valve V42 is provided in the flow purge gas path L42 as the flow rate adjustment unit 4 capable of adjusting the flow rate of the exhaust path L4.
  • one adsorption tube 2B is made equal in pressure to the other adsorption tube 2A by operating the opening/closing states of the first opening/closing valve V41 and the second opening/closing valve V42 (see FIG. 4).
  • the flow rate in the exhaust gas path L41 and the flow purge gas path L42 is adjusted by operating the opening and closing states of the first opening and closing valve V41 and the second opening and closing valve V42, thereby realizing pressure equalization of the adsorption columns 2A and 2B, but the pressure equalization of the adsorption columns 2A and 2B is not limited to the above method.
  • the opening and closing valve V4B may be switched from an open state to a closed state to fill the adsorption column 2B and equalize the pressure with the adsorption column 2A. In this way, the adsorption columns 2A and 2B can be more quickly equalized in pressure.
  • the flow purge step S3 shown in FIG. 5 is performed.
  • the opening and closing valve V4B is closed to equalize the pressure of the adsorption columns 2A and 2B, so in the pressure equalization step S2, it is not essential to switch the first opening and closing valve V41 from an open state to a closed state and to switch the second opening and closing valve V42 from a closed state to an open state.
  • the above-described opening and closing operations of the first opening and closing valve V41 and the second opening and closing valve V42 may be performed when performing the flow purge process S3 after completing the pressure equalization process S2.
  • the present invention relates to an air purification device and an air purification method.

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  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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  • Separation Of Gases By Adsorption (AREA)
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