CN112827312A - Device system for purifying helium by using composite process - Google Patents

Device system for purifying helium by using composite process Download PDF

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CN112827312A
CN112827312A CN202110263359.8A CN202110263359A CN112827312A CN 112827312 A CN112827312 A CN 112827312A CN 202110263359 A CN202110263359 A CN 202110263359A CN 112827312 A CN112827312 A CN 112827312A
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gas
module
unit
separation membrane
swing adsorption
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甘泳
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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
    • B01D53/22—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 diffusion
    • B01D53/225—Multiple stage diffusion
    • B01D53/226—Multiple stage diffusion in serial connexion
    • 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
    • B01D53/005—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 heat treatment
    • 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
    • B01D53/047—Pressure 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
    • B01D53/22—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 diffusion
    • B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
    • 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
    • B01D53/26—Drying gases or vapours
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B23/00—Noble gases; Compounds thereof
    • C01B23/001—Purification or separation processes of noble gases
    • C01B23/0036—Physical processing only
    • C01B23/0042—Physical processing only by making use of membranes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B23/00—Noble gases; Compounds thereof
    • C01B23/001—Purification or separation processes of noble gases
    • C01B23/0036—Physical processing only
    • C01B23/0052—Physical processing only by adsorption in solids
    • 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
    • B01D53/22—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 diffusion
    • B01D2053/221—Devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/18—Noble gases

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention discloses a device system for purifying helium by using a composite process. The device system for purifying helium by using the composite process comprises a pretreatment module, a first section of separation membrane module, a second section of separation membrane module, a pressure swing adsorption module and a temperature swing adsorption module; the raw material gas source is communicated with the pretreatment module, and the raw material gas is purified through the pretreatment module, the first section separation membrane module, the second section separation membrane module, the pressure swing adsorption module and the temperature swing adsorption module which are sequentially communicated. The device system for purifying helium by using the composite process can fully purify gases containing low-concentration helium and other complex components, and has high helium recovery rate; the device system has the advantages of simple and compact structure, wide application range, convenient operation, safety, reliability and high automation degree, and is suitable for the effect of industrial production.

Description

Device system for purifying helium by using composite process
Technical Field
The invention relates to the technical field of chemical gas purification, in particular to a device system for purifying helium by using a composite process.
Background
Helium is one of rare strategic materials indispensable to the development of national defense military industry and high-tech industry. Helium-containing natural gas has heretofore been the only source of helium for commercial production. Helium resources in China are quite poor, the content is very low, the extraction difficulty is high, and the cost is high. Therefore, the research and development of the advanced natural gas helium stripping technology and the purification and recovery of the helium used in the process production have important significance for improving the economy of helium production, guaranteeing the domestic helium safety and promoting the development of the natural gas helium stripping industry in China.
The prior helium purification process mainly comprises a pressure swing adsorption process, a temperature swing adsorption process, a cryogenic process, a membrane separation process and the like. The principle of the pressure swing adsorption process and the temperature swing adsorption process is that the gas purification is realized by utilizing different adsorption capacities of the solid adsorbent to different gases. When the gas passes through the adsorption bed layer, most part of one (or more) gas in the mixed gas is adsorbed on the bed layer, and the small part flows out; allowing most of the other gas (or gases) in the mixed gas to flow out and a small part of the other gas (or gases) to be adsorbed on the bed layer; thereby achieving the purpose of improving the purity of the gas. The two processes both belong to batch processing processes, and the solid adsorbent needs to be regenerated, wherein the pressure swing adsorption process mainly regenerates the solid adsorbent by pressure reduction desorption, and the temperature swing adsorption process mainly regenerates the solid adsorbent by heating and temperature rise desorption. The two processes are relatively complex to control, and the recovery rate of helium is relatively low.
The low-temperature deep cooling process is mature, the process control is complex, and the investment cost and the energy consumption are high.
The principle of the membrane separation process is that different gases are separated by utilizing different dissolution and diffusion rates of all gas components in a membrane material and different permeation rates of different gases passing through a membrane wall under the action of partial pressure difference on two sides of the membrane. The gas membrane separation technology has the advantages of simple process, convenient operation and maintenance, and lower investment cost and operating cost. However, membrane separation processes do not allow for efficient separation of complex components.
The prior art, such as patent document US2013/0239804a1, discloses a composite process of a single-stage membrane method and pressure swing adsorption for gas separation, and theoretically, the technical economic feasibility of extracting high-purity helium from simple-component low-concentration helium-containing gas is not available; the patent document US2017/0320736a1 discloses a helium purification process by combining a single-stage two-stage membrane method and pressure swing adsorption, and theoretically, the technical and economic feasibility for extracting high-purity helium from low-concentration helium gas containing complex components such as hydrogen and carbon dioxide is still not achieved.
Disclosure of Invention
According to one aspect of the invention, a device system for purifying helium by using a composite process is provided, which comprises a pretreatment module, a first section separation membrane module, a second section separation membrane module, a pressure swing adsorption module and a temperature swing adsorption module; the first-stage separation membrane module is respectively provided with an air inlet, a non-permeation air outlet and a permeation air outlet; the second section of separation membrane module is respectively provided with a main air inlet, a non-permeation air outlet, a permeation air outlet and two circulating reflux air inlets; the pressure swing adsorption module is respectively provided with a main air inlet, a desorption gas exhaust port, a circulating reflux gas outlet, a main air outlet and a circulating reflux gas inlet; the temperature swing adsorption module is respectively provided with a main air inlet, a desorption gas exhaust port, a circulating reflux gas outlet and a main air outlet; the gas inlet of the pretreatment module is communicated with a raw material gas source, the gas outlet of the pretreatment module is communicated with the gas inlet of the first section of separation membrane module, the permeate gas outlet of the first section of separation membrane module is communicated with the main gas inlet of the second section of separation membrane module, the permeate gas outlet of the second section of separation membrane module is communicated with the main gas inlet of the pressure swing adsorption module, the main gas outlet of the pressure swing adsorption module is communicated with the gas inlet of the first temperature swing adsorption module, and the main gas outlet of the temperature swing adsorption module is a main product gas outlet.
The device system for purifying helium by the composite process has the advantages that the raw material gas is purified by the pretreatment module, the first section of separation membrane module, the second section of separation membrane module, the pressure swing adsorption module and the temperature swing adsorption module which are sequentially communicated, the device system provides a device system for extracting high-purity helium from gas containing complex components and low-concentration helium by compositely using two sections of multistage gas separation membranes and pressure swing adsorption and temperature swing adsorption processes, the flow of the device system is relatively simple, the investment and operation cost is low, the device system has high recovery rate, and one or more of the prior art problems can be solved.
In some embodiments, the first stage separation membrane module is a single stage membrane unit, employing a separation membrane with a higher helium/methane separation coefficient; the second section of separation membrane module is a multi-stage membrane unit and adopts a separation membrane with a higher helium/methane separation coefficient. The first-stage separation membrane module is a single-stage membrane unit, and a separation membrane with a higher helium/methane separation coefficient is adopted, so that the helium in the feed gas is pre-concentrated, and the higher helium recovery rate is kept. The non-permeate gas of the first stage separation membrane module can be reused; the second section of separation membrane module is a multi-stage membrane unit, adopts a separation membrane with a higher helium/methane separation coefficient, and mainly aims at removing methane and nitrogen in helium. The mixed tank and the compressor are attached, and the beneficial effect is that the circulating return gas of the second section separation membrane module and the circulating return gas of the pressure swing adsorption module are received, so that the high helium recovery rate is maintained. The non-permeate gas of the second stage separation membrane module can be reused.
In some embodiments, the pretreatment module sequentially comprises a filtering unit, a drying unit and a heating unit, wherein an air inlet of the filtering unit is an air inlet of the pretreatment module, an air outlet of the heating unit is an air outlet of the pretreatment module, an air outlet of the filtering unit is communicated with an air inlet of the drying unit, and an air outlet of the drying unit is communicated with an air inlet of the heating device. The membrane separation device has the advantages that the filtering device is used for removing solid matters in the feed gas, the drying device is used for removing redundant moisture in the feed gas, the heating device is used for enabling the feed gas to reach a certain temperature, and the membrane separation efficiency can be higher due to the proper gas temperature before the feed gas enters the separation membrane module.
In some embodiments, the first stage separation membrane module gas inlet communicates with a gas outlet of a heating unit in the pretreatment module, and the non-permeate gas outlet of the first stage separation membrane module exhausts the plant system. The first-stage separation membrane module has the beneficial effects that after the communication, the first-stage separation membrane module is a single-stage membrane unit, and a separation membrane with a higher helium/methane separation coefficient is adopted, so that the helium in the feed gas is pre-concentrated, and the higher helium recovery rate is kept. The non-permeate gas of the first stage separation membrane module can be reused.
In some embodiments, the second-stage separation membrane module sequentially comprises a mixing unit, a compression unit and a membrane separation unit, the gas inlet of the mixing unit is the gas inlet of the second-stage gas separation membrane module, the non-permeate gas of the membrane separation unit is the gas outlet of the second-stage gas separation membrane module, the gas outlet of the mixing unit is communicated with the gas inlet of the compression unit, the gas outlet of the compression unit is communicated with the gas inlet of the separation membrane unit, the gas outlet of the non-permeate gas of the separation membrane unit is used for exhausting gas of the device system, and the circulation reflux gas of the separation membrane unit is connected into the mixing unit. The multi-stage membrane unit has the advantages that the multi-stage membrane unit is formed by the second-stage separation membrane module after communication, the separation membrane with a high helium/methane separation coefficient is adopted, and the main purpose is to remove methane and nitrogen in helium. The mixed tank and the compressor are attached, and the beneficial effect is that the circulating return gas of the second section separation membrane module and the circulating return gas of the pressure swing adsorption module are received, so that the high helium recovery rate is maintained. The non-permeate gas of the second stage separation membrane module can be reused.
In some embodiments, the pressure swing adsorption module sequentially comprises a mixing unit, a compression unit and a pressure swing adsorption unit, wherein an air inlet of the mixing unit is an air inlet of the pressure swing adsorption module, an air outlet of the pressure swing adsorption unit is a main air outlet of the pressure swing adsorption module, an air outlet of the mixing unit is communicated with an air inlet of the compression unit, an air outlet of the compression unit is communicated with an air inlet of the pressure swing adsorption unit, a desorption gas outlet of the pressure swing adsorption unit exhausts the device system, and a circulating backflow gas of the pressure swing adsorption unit is connected into the mixing unit in the second section of separation membrane module. The pressure swing adsorption module has the beneficial effects that the pressure swing adsorption module adopts various adsorption media, and the main aim is to remove carbon dioxide, moisture, a small amount of methane, nitrogen and the like. Wherein, the circulating reflux gas containing helium is connected into the mixing unit of the second section of membrane separation module, so that the helium recovery rate of the device is improved.
In some embodiments, the recycle reflux gas of the temperature swing adsorption module is connected to a mixing unit in the pressure swing adsorption module; the temperature swing adsorption module uses special hydrogen absorption alloy with low equilibrium pressure to realize hydrogen absorption at room temperature, thereby realizing complete separation of hydrogen and helium, wherein the temperature swing adsorption module comprises 3 groups of bed bodies, 1 group of hydrogen absorption, 1 group of vacuum pumping and 1 group of hydrogen discharge. Wherein, the circulating reflux gas containing helium is connected into the mixing unit of the pressure swing adsorption module, so that the helium recovery rate of the device is improved.
In some embodiments, the device system is capable of simultaneously effecting the purification of helium and or hydrogen and or carbon dioxide gas.
In some embodiments, each of the first stage gas separation membrane module and the second stage gas separation membrane unit comprises one or more gas separation membrane modules connected in parallel or in series, and the gas separation membrane modules are one or more of hollow fiber membranes, spiral wound membranes and plate type membranes. The gas separation membrane module has the advantages that a better combination scheme exists among each section of gas separation membrane module according to the number of the separation membrane modules, and the better number of the separation membrane modules of each section of gas separation membrane module is obtained through calculation, so that the gas purification efficiency and the recovery rate can be improved, the waste of the separation membrane modules can be avoided, and the process cost is reduced. The gas separation membrane module structure is one or more of a hollow fiber membrane, a spiral wound membrane and a plate type membrane.
In some embodiments, the pressure swing adsorption module employs multiple adsorption media, with the primary objective being to remove carbon dioxide and moisture, and small amounts of methane and nitrogen, among others. Wherein, the circulating reflux gas containing helium is connected into the mixing unit of the second section of membrane separation module, so that the helium recovery rate of the device is improved.
The device system for purifying helium by using the composite process can fully purify gases containing low-concentration helium and other complex components, and has high helium recovery rate; the device system has the advantages of simple and compact structure, wide application range, convenient operation, safety, reliability and high automation degree, and is suitable for industrial production.
Drawings
FIG. 1 is a schematic process flow diagram of an apparatus system for helium purification using a hybrid process according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to fig. 1.
The device system for purifying helium by using a composite process comprises a pretreatment module 1, a first section separation membrane module 2, a second section separation membrane module 3, a pressure swing adsorption module 4 and a temperature swing adsorption module 5; the first section of separation membrane module 2 is respectively provided with an air inlet, a non-permeation air outlet and a permeation air outlet; the second-section separation membrane module 3 is respectively provided with a main air inlet, a non-permeation air outlet, a permeation air outlet and two circulating reflux air inlets; the pressure swing adsorption module 4 is respectively provided with a main air inlet, a desorption gas exhaust port, a circulating reflux gas outlet, a main air outlet and a circulating reflux gas inlet; the temperature swing adsorption module 5 is respectively provided with a main air inlet, a desorption gas exhaust port, a circulating reflux gas outlet and a main air outlet;
the gas inlet of the pretreatment module 1 is communicated with a raw material gas source, the gas outlet of the pretreatment module 1 is communicated with the gas inlet of the first section separation membrane module 2, the permeate gas outlet of the first section separation membrane module 2 is communicated with the main gas inlet of the second section separation membrane module 3, the permeate gas outlet of the second section separation membrane module 3 is communicated with the main gas inlet of the pressure swing adsorption module 4, the main gas outlet of the pressure swing adsorption module 4 is communicated with the gas inlet of the first temperature swing adsorption module 5, and the main gas outlet of the temperature swing adsorption module 5 is a main product gas outlet.
Pretreatment module 1 includes filtering unit 11, drying unit 12 and heating unit 13 in proper order, filtering unit 11's air inlet be pretreatment module 1's air inlet promptly, heating unit 13's gas outlet be pretreatment module 1's gas outlet promptly, filtering unit 11's gas outlet with drying unit 12 air inlet intercommunication, drying unit 12 gas outlet with heating device 13's air inlet intercommunication.
The air inlet of the first-section separation membrane module 2 is communicated with the air outlet of the heating unit 13 in the pretreatment module 1, and the non-permeable air outlet of the first-section separation membrane module 2 exhausts air for the device system.
Second section separation membrane module 3 includes mixing unit 31, compression unit 32 and membrane separation unit 33 in proper order, mixing unit 31's air inlet is the air inlet of second section gas separation membrane module 3 promptly, membrane separation unit 33's non-permeate gas is second section gas separation membrane module 3 gas outlet promptly, mixing unit 31 gas outlet and compression unit 32 gas inlet intercommunication, compression unit 32 gas outlet and separation membrane unit 33 gas inlet intercommunication, separation membrane unit 33's non-permeate gas outlet is the device system exhaust, and separation membrane unit 33's circulation backward flow gas inserts mixing unit 31.
The pressure swing adsorption module 4 sequentially comprises a mixing unit 41 and a compression unit 42, wherein the air inlet of the mixing unit 41 is the air inlet of the pressure swing adsorption module 4, the air outlet of the pressure swing adsorption unit 43 is the main air outlet of the pressure swing adsorption module 4, the air outlet of the mixing unit 41 is communicated with the air inlet of the compression unit 42, the air outlet of the compression unit 42 is communicated with the air inlet of the pressure swing adsorption unit 43, the analysis gas outlet of the pressure swing adsorption unit 43 is the device system exhaust gas, and the circulation return gas of the pressure swing adsorption unit 43 is connected into the mixing unit 31 in the second section of separation membrane module 3.
The recycle reflux gas of the temperature swing adsorption module 5 is connected to the mixing unit 41 in the pressure swing adsorption module 4.
The first stage gas separation membrane module 2 and the second stage gas separation membrane unit 33 respectively comprise one or more gas separation membrane modules connected in parallel or in series, and the gas separation membrane modules are in one or more of hollow fiber membranes, spiral wound membranes and plate type membranes.
The device system is applied to the simultaneous purification of helium and/or hydrogen and/or carbon dioxide gas.
The following is a process for purifying a raw gas containing helium at a low concentration by using the system of the apparatus shown in FIG. 1, comprising the steps of:
(1) the feed gas (composition of 1.75% vol helium, 0.02% hydrogen, 10.46% nitrogen and 87.77% vol alkane) enters the filtering device 11, the drying device 12 and the heating device 13 in the pretreatment module 1 in sequence. The dust and oil concentration of the pretreated gas meet the primary standard in compressed air ISO8573-1, the water dew point temperature meets the secondary standard in ISO8573-1, and the dry bulb temperature reaches 25-50 ℃. Then the gas at the gas outlet enters a gas inlet of the first-stage separation membrane module 2 to carry out primary concentration of helium;
(2) a gas outlet of the non-permeable gas of the first-stage gas separation membrane module 2 can obtain a primarily concentrated helium-containing gas (containing 12.68% of helium, 0.14% of hydrogen, 12.86% of nitrogen and 74.32% of alkane), and then the gas at the gas outlet enters a gas inlet of the second-stage gas separation membrane module 3 for primary gas purification;
(3) a mixed gas (containing 98.00% helium, 0.85% hydrogen, 0.34% nitrogen and 0.85% alkane) mainly containing helium and hydrogen is obtained from a non-permeable gas outlet of the second-stage gas separation membrane module 3, and then the gas at the gas outlet enters a gas inlet of the pressure swing adsorption module 4 for secondary gas purification;
(4) the main outlet gas of the pressure swing adsorption module 4 is a high-purity hydrogen-helium mixed gas (containing 99.14% helium and 0.86% hydrogen), and then the gas at the gas outlet enters the gas inlet of the temperature swing adsorption module 5 for dehydrogenation and purification;
(5) the outlet gas of the temperature swing adsorption module 5 is 99.995 percent high-purity helium, and meets the requirement of the high-purity helium in the national standard GB/T4844-2011 of helium.
The device system for purifying helium by using the composite process can extract high-purity helium, byproducts such as high-purity hydrogen, carbon dioxide and the like from gas containing complex components and low-concentration helium, so that the gas is fully purified, and the gas recovery rate is high; the device system has the advantages of simple and compact structure, wide application range, convenient operation, safety, reliability and high automation degree, and is suitable for industrial production.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (8)

1. A device system for purifying helium by using a composite process is characterized by comprising a pretreatment module (1), a first section separation membrane module (2), a second section separation membrane module (3), a pressure swing adsorption module (4) and a temperature swing adsorption module (5);
the first section of separation membrane module (2) is respectively provided with an air inlet, a non-permeable air outlet and a permeable air outlet;
the second section of separation membrane module (3) is respectively provided with a main air inlet, a non-permeation air outlet, a permeation air outlet and two circulating reflux air inlets;
the pressure swing adsorption module (4) is respectively provided with a main air inlet, a desorption gas exhaust port, a circulating reflux gas outlet, a main air outlet and a circulating reflux gas inlet;
the temperature swing adsorption module (5) is respectively provided with a main air inlet, a desorption gas exhaust port, a circulating reflux gas outlet and a main air outlet;
wherein the content of the first and second substances,
the gas inlet of the pretreatment module (1) is communicated with a raw material gas source, the gas outlet of the pretreatment module (1) is communicated with the gas inlet of the first section of separation membrane module (2), the permeate gas outlet of the first section of separation membrane module (2) is communicated with the main gas inlet of the second section of separation membrane module (3), the permeate gas outlet of the second section of separation membrane module (3) is communicated with the main gas inlet of the pressure swing adsorption module (4), the main gas outlet of the pressure swing adsorption module (4) is communicated with the gas inlet of the first temperature swing adsorption module (5), and the main gas outlet of the temperature swing adsorption module (5) is a main product gas inlet.
2. The device system for purifying helium by using a combined process as claimed in claim 1, wherein the pretreatment module (1) comprises a filtration unit (11), a drying unit (12) and a heating unit (13) in sequence, the air inlet of the filtration unit (11) is the air inlet of the pretreatment module (1), the air outlet of the heating unit (13) is the air outlet of the pretreatment module (1), the air outlet of the filtration unit (11) is communicated with the air inlet of the drying unit (12), and the air outlet of the drying unit (12) is communicated with the air inlet of the heating unit (13).
3. The device system for helium purification by using composite process as claimed in claim 1, wherein the gas inlet of the first section separation membrane module (2) is communicated with the gas outlet of the heating unit (13) in the pretreatment module (1), and the non-permeable gas outlet of the first section separation membrane module (2) is used for device system exhaust.
4. The device system for purifying helium by using a composite process as defined in claim 1, wherein the second-stage separation membrane module (3) comprises a mixing unit (31), a compression unit (32) and a membrane separation unit (33) in sequence, the gas inlet of the mixing unit (31) is the gas inlet of the second-stage gas separation membrane module (3), the non-permeable gas of the membrane separation unit (33) is the gas outlet of the second-stage gas separation membrane module (3), the gas outlet of the mixing unit (31) is communicated with the gas inlet of the compression unit (32), the gas outlet of the compression unit (32) is communicated with the gas inlet of the separation membrane unit (33), the non-permeable gas outlet of the separation membrane unit (33) is the exhaust of the device system, and the circulating reflux gas of the separation membrane unit (33) is connected to the mixing unit (31).
5. The device system for purifying helium by using a composite process as defined in claim 1, wherein the pressure swing adsorption module (4) sequentially comprises a mixing unit (41) and a compression unit (42) and a pressure swing adsorption unit (43), the air inlet of the mixing unit (41) is the air inlet of the pressure swing adsorption module (4), the air outlet of the pressure swing adsorption unit (43) is the main air outlet of the pressure swing adsorption module (4), the air outlet of the mixing unit (41) is communicated with the air inlet of the compression unit (42), the air outlet of the compression unit (42) is communicated with the air inlet of the pressure swing adsorption unit (43), the analysis gas outlet of the pressure swing adsorption unit (43) is the exhaust of the device system, and the circulating reflux gas of the pressure swing adsorption unit (43) is connected to the mixing unit (31) in the second separation membrane module (3).
6. The system of claim 1, wherein the recycle gas from the temperature swing adsorption module (5) is fed to the mixing unit (41) in the pressure swing adsorption module (4).
7. The device system for helium purification by composite process according to claim 1, wherein the first stage gas separation membrane module (2) and the second stage gas separation membrane unit (33) respectively comprise one or more gas separation membrane modules connected in parallel or in series, and the structure of the gas separation membrane modules is one or more of hollow fiber membranes, spiral wound membranes and plate type membranes.
8. The system of claim 1, wherein the system is used for simultaneous purification of helium and/or hydrogen and/or carbon dioxide.
CN202110263359.8A 2021-03-18 2021-03-18 Device system for purifying helium by using composite process Pending CN112827312A (en)

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CN202110263359.8A CN112827312A (en) 2021-03-18 2021-03-18 Device system for purifying helium by using composite process

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Application Number Priority Date Filing Date Title
CN202110263359.8A CN112827312A (en) 2021-03-18 2021-03-18 Device system for purifying helium by using composite process

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CN112827312A true CN112827312A (en) 2021-05-25

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