CN110559800A - Intermediate-temperature hydrogen storage alloy preparation and pressure swing adsorption purification method - Google Patents
Intermediate-temperature hydrogen storage alloy preparation and pressure swing adsorption purification method Download PDFInfo
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- CN110559800A CN110559800A CN201910776995.3A CN201910776995A CN110559800A CN 110559800 A CN110559800 A CN 110559800A CN 201910776995 A CN201910776995 A CN 201910776995A CN 110559800 A CN110559800 A CN 110559800A
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- hydrogen storage
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 177
- 239000001257 hydrogen Substances 0.000 title claims abstract description 176
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 176
- 238000003860 storage Methods 0.000 title claims abstract description 121
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 57
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 50
- 239000000956 alloy Substances 0.000 title claims abstract description 50
- 238000000746 purification Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 125
- 239000003463 adsorbent Substances 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 20
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011777 magnesium Substances 0.000 claims abstract description 12
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 235000003270 potassium fluoride Nutrition 0.000 claims abstract description 9
- 239000011698 potassium fluoride Substances 0.000 claims abstract description 9
- 238000007598 dipping method Methods 0.000 claims abstract description 5
- 230000002378 acidificating effect Effects 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 20
- 150000002431 hydrogen Chemical class 0.000 claims description 16
- 238000001994 activation Methods 0.000 claims description 12
- 239000003575 carbonaceous material Substances 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 9
- 238000003795 desorption Methods 0.000 claims description 8
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 6
- 239000011232 storage material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- 230000001147 anti-toxic effect Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 230000005674 electromagnetic induction Effects 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims description 2
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052746 lanthanum Inorganic materials 0.000 claims description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 238000003786 synthesis reaction Methods 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000000498 ball milling Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000000446 fuel Substances 0.000 description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000002407 reforming Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- RIAXXCZORHQTQD-UHFFFAOYSA-N lanthanum magnesium Chemical compound [Mg].[La] RIAXXCZORHQTQD-UHFFFAOYSA-N 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000002283 diesel fuel Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910000858 La alloy Inorganic materials 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- ATTFYOXEMHAYAX-UHFFFAOYSA-N magnesium nickel Chemical class [Mg].[Ni] ATTFYOXEMHAYAX-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- BYMUNNMMXKDFEZ-UHFFFAOYSA-K trifluorolanthanum Chemical compound F[La](F)F BYMUNNMMXKDFEZ-UHFFFAOYSA-K 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000001996 bearing alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
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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
- B01D53/047—Pressure swing adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0207—Compounds of Sc, Y or Lanthanides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
-
- B22F1/0003—
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
-
- 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
- B01D2256/16—Hydrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/102—Nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/104—Oxygen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/11—Noble gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/304—Hydrogen sulfide
-
- 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
- B01D2257/502—Carbon monoxide
-
- 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
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7027—Aromatic hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
- C22C2202/04—Hydrogen absorbing
-
- 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
Abstract
The invention discloses a method for preparing a medium-temperature hydrogen storage alloy and purifying by pressure swing adsorption for hydrogen purification. The medium-temperature hydrogen storage alloy comprises magnesium and a compound thereof, and a functional metal and a compound thereof, wherein the content of the magnesium is more than 50%. The preparation of the medium-temperature hydrogen storage alloy comprises the steps of smelting and ball-milling metal raw materials, then dipping in an acidic potassium fluoride solution and the like, wherein a pressure swing adsorption purification system comprises an adsorption hydrogen storage tank and a control unit. Can be used for purifying vacuum pressure swing adsorption synthesis gas and preparing and storing high-purity hydrogen. The hydrogen storage alloy subjected to ball milling and dipping treatment has excellent anti-toxicity performance and still has extremely strong hydrogen absorption capacity in various synthetic gas atmospheres; the purification method using the medium-temperature hydrogen storage alloy as the adsorbent can obtain hydrogen with high recovery rate and high purity.
Description
Technical Field
the invention relates to a method for preparing a medium-temperature hydrogen storage alloy and purifying the medium-temperature hydrogen storage alloy by pressure swing adsorption, belonging to the technical field of gas purification.
Background
In the fields of chemical industry, power generation and the like, various mixed gases need to be separated and purified, for example, in the processes of hydrogen production by reforming liquid fuel, hydrogen production by electrolyzing water, ammonia synthesis by coal gasification and the like, O in synthesis gas needs to be separated and purified2、CO2And hydrocarbon and other impurities are separated to prepare pure hydrogen for power generation, ammonia synthesis and the like. The traditional mixed gas purification mode is low-temperature methanol washing, the method firstly needs to cool the gas, the cooled gas enters an absorption tower, and CO in the cooled gas enters an absorption tower2、H2s is absorbed by low-temperature liquid methanol, and the rest gas is subjected to cold recovery and reheating and then is continuously subjected to subsequent processes. The cooling and reheating processes of the gas result in wasted energy and require complex heat exchange and refrigeration equipment.
The pressure swing adsorption purification method is an effective method which can separate and recycle various gases to obtain high-purity gas with specific components. The traditional pressure swing adsorption purification process mainly adsorbs impurities in hydrogen, the working temperature is normal temperature, the purity and yield of product gas hardly reach high level at the same time, and the technical indexes are improved by methods of improving the performance of an adsorbent, increasing the number of adsorption towers and the like, so that the size of a separation device is large, and the process is complex.
Disclosure of Invention
The invention aims to provide a method for preparing a medium-temperature hydrogen storage alloy and purifying the medium-temperature hydrogen storage alloy by pressure swing adsorption.
The invention is realized by the following technical scheme:
A preparation method of medium-temperature hydrogen storage alloy comprises magnesium and/or compounds thereof and functional metals and/or compounds thereof, wherein the functional metals comprise any one or more of nickel, iron, titanium, lanthanum, cerium, strontium, chromium, zinc, vanadium and cobalt; the mass percentage of the magnesium and/or the compound thereof is more than 50 percent; the preparation method comprises the following steps:
Weighing a proper amount of magnesium and/or compounds thereof, weighing a proper amount of functional metal and/or compounds thereof, and uniformly mixing to obtain a metal raw material;
putting the metal raw material into a medium-frequency electromagnetic induction smelting furnace for smelting to obtain metal alloy with uniform components;
Weighing a proper amount of carbon material, mixing the metal alloy with the carbon material, and grinding by a ball mill to obtain a metal hydrogen storage material with the granularity of millimeter;
and (2) dipping and stirring the metal hydrogen storage material by using an acidic potassium fluoride solution, then filtering, washing with water and drying to obtain the medium-temperature hydrogen storage alloy powder with antitoxic property.
In the above technical solution, the method further includes: the metal raw material is placed in a medium-frequency electromagnetic induction smelting furnace to be smelted for more than 3 times to obtain the metal alloy with uniform components.
In the above technical scheme, the carbon material comprises any one or a mixture of more of activated carbon powder, carbon molecular sieve, carbon fiber and carbon nanotube, and the mass percentage x of the carbon material isCIs 0<xC<5％。
In the technical scheme, the ball mill is used for grinding in an inert atmosphere, the grinding time is 5-1000 h, and the grinding pressure is greater than 0.1 MPa.
In the technical scheme, the concentration of the potassium fluoride solution is 3-9 g/L, and the pH value of the solution is 1-6.
a hydrogen medium temperature pressure swing adsorption purification method, the purification method uses the purification system comprising adsorption hydrogen storage tank and vacuum pump; one end of the adsorption hydrogen storage tank is provided with a raw material gas inlet and a reverse-release gas outlet, and the other end is provided with a gas outlet; the method comprises the following steps;
filling the medium-temperature hydrogen storage alloy powder prepared by the method into an adsorption hydrogen storage tank as an adsorbent;
Opening a raw material gas inlet of the adsorption hydrogen storage tank, and introducing a gas difficult to adsorb into the adsorption hydrogen storage tank to increase the pressure of the adsorption hydrogen storage tank until the adsorption pressure is reached;
Sending the mixed gas to be purified containing hydrogen into an adsorption hydrogen storage tank through a feed gas inlet, simultaneously opening a gas outlet of the adsorption hydrogen storage tank to enable hydrogen components in the mixed gas to be purified to react with the adsorbent to be adsorbed, and discharging and collecting residual gas components serving as gas difficult to be adsorbed from the gas outlet;
when the adsorbent reaches adsorption saturation, closing the feed gas inlet; further reducing the external pressure of the gas outlet to the forward pressure, continuously discharging and collecting the residual gas in the adsorption hydrogen storage tank, and gradually reducing the internal pressure of the adsorption hydrogen storage tank until the external pressure is the same as the external pressure of the gas outlet; the cis-relieving pressure is less than the adsorption pressure;
Closing the gas outlet, opening a reverse-gas outlet of the adsorption hydrogen storage tank, and enabling the pressure of the reverse-gas outlet to be lower than the forward-discharge pressure, so that the hydrogen adsorbed by the adsorbent in the adsorption hydrogen storage tank can be released in the reverse direction of adsorption, and the purified hydrogen flows out through the reverse-gas outlet and is collected and stored;
Communicating a reverse-release gas outlet of the adsorption hydrogen storage tank with an inlet of a vacuum pump, reducing the pressure of the reverse-release gas outlet to vacuum reverse-release pressure, further releasing hydrogen adsorbed by the adsorbent in the adsorption hydrogen storage tank, regenerating the adsorbent, and discharging and collecting purified hydrogen from the outlet of the vacuum pump;
And repeatedly using the regenerated adsorbent for adsorbing the mixed gas to be purified.
The method further comprises;
Activating the medium-temperature hydrogen storage alloy powder prepared by the method into activated hydrogen storage alloy powder under the hydrogen atmosphere, wherein the activation temperature is 100-500 ℃;
Filling activated hydrogen storage alloy powder serving as an adsorbent into an adsorption hydrogen storage tank; desorbing the hydrogen adsorbed in the activation process by the activated hydrogen storage alloy powder through vacuum desorption and/or inert gas purging;
and opening a raw material gas inlet of the adsorption hydrogen storage tank, and introducing the gas difficult to adsorb into the adsorption hydrogen storage tank to increase the pressure of the adsorption hydrogen storage tank until the adsorption pressure is reached.
in the above technical solution, the vacuum desorption process comprises:
Communicating a reverse-release gas outlet of the adsorption hydrogen storage tank with an inlet of a vacuum pump, and opening the reverse-release gas outlet to reduce the pressure of the reverse-release gas outlet to vacuum reverse-release pressure; the activated hydrogen storage alloy powder is made to desorb the hydrogen gas adsorbed in the activation process.
in the above technical solution, the inert gas purging process includes:
And opening a reverse-air outlet of the adsorption hydrogen storage tank, and continuously blowing the reverse-air outlet by inert gas under normal pressure to ensure that the activated hydrogen storage alloy powder desorbs the hydrogen adsorbed in the activation process.
In the technical scheme, the mixed gas to be purified comprises hydrogen and gas difficult to adsorb; the difficult-to-adsorb gas comprises any one or more of nitrogen, oxygen, rare gas, carbon monoxide, carbon dioxide and hydrocarbon gas.
The purity of the purified hydrogen reaches more than 99.9 percent and the primary yield can reach more than 90 percent.
the invention has the following advantages and beneficial effects: the medium-temperature hydrogen storage alloy provided by the invention has higher H2high adsorption capacity, high adsorption selectivity and good adsorption kinetics performance, and can tolerate O2、CO2、CO、H2The poisoning of gases such as O and the like can be used as an adsorbent in various occasions for purifying synthesis gas, and the raw materials are easy to obtain and mass production is easy; the medium-temperature pressure swing adsorption purification method provided by the invention has the advantages that the device is simple, the portability can be realized, the high purity and the high yield of the hydrogen can be simultaneously achieved, and the yield can be stabilized to be more than 90% when the purity of the hydrogen is 99.9%.
Drawings
FIG. 1 is a schematic diagram of a medium temperature pressure swing adsorption system in accordance with the present invention
FIG. 2 shows the results of a syngas adsorption capacity test of a warm fluorinated magnesium nickel hydrogen storage alloy in an embodiment of the invention: syngas composition 79.9% H2+20％CO2+0.1％CO。
Detailed Description
The following will further describe the specific implementation and operation of the present invention with reference to the following examples.
The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.
A medium-temperature hydrogen-bearing alloy contains Mg and/or its compound and functional metal and/or its compound, where the functional metal includes any one or more of Ni, Fe, Ti, La, Ce, Sr, Cr, Zn, V and Co. Wherein the mass percent of magnesium (magnesium compound is also calculated by magnesium) is more than 50 percent.
The preparation method of the medium-temperature hydrogen storage alloy comprises the following steps:
Weighing a proper amount of magnesium and/or compounds thereof, weighing a proper amount of functional metal and/or compounds thereof, and uniformly mixing to obtain the metal raw material.
And (3) smelting the metal raw material in a medium-frequency electromagnetic induction smelting furnace for more than 3 times to obtain the metal alloy with uniform components.
Weighing a proper amount of carbon material, wherein the carbon material comprises any one or a mixture of more of activated carbon powder, carbon molecular sieve, carbon fiber and carbon nano tube, and the mass percentage x of the carbon materialCIs 0<xC<5 percent. Mixing the metal alloy and the carbon material, and grinding the mixture by a ball mill to obtain a metal hydrogen storage material with the granularity of millimeter; and grinding in an inert atmosphere for 5-1000 h by using a ball mill, wherein the grinding pressure is greater than 0.1 MPa.
and (2) dipping and stirring the metal hydrogen storage material by using an acidic potassium fluoride solution, wherein the concentration of the potassium fluoride solution is 3-9 g/L, and the pH value of the solution is 1-6. Then filtering and washing with water and drying to obtain the medium-temperature hydrogen storage alloy powder with antitoxic property.
A hydrogen medium-temperature pressure swing adsorption purification system comprises an adsorption hydrogen storage tank, a vacuum pump and a control unit. The adsorption hydrogen storage tank is shown in figure 1, one end of the adsorption hydrogen storage tank is provided with a raw material gas inlet and a reverse-release gas outlet, and the other end of the adsorption hydrogen storage tank is provided with a gas outlet. The middle part or the lower part of the tank body of the adsorption hydrogen storage tank is provided with a packing layer and a packing inlet for placing an adsorbent. The control unit is used for controlling the operation of the adsorption hydrogen storage tank. The reverse venting gas outlet is also the product gas outlet. The system can be operated by adopting a single adsorption hydrogen storage tank, and a plurality of adsorption hydrogen storage tanks are operated in parallel.
the hydrogen medium temperature pressure swing adsorption purification method comprises the following steps;
The medium-temperature hydrogen storage alloy powder prepared by the method is filled into an adsorption hydrogen storage tank as an adsorbent. The optimized scheme is that the medium-temperature hydrogen storage alloy powder prepared by the method is activated into activated hydrogen storage alloy powder under the hydrogen atmosphere, and the activation temperature is 100-500 ℃; filling activated hydrogen storage alloy powder serving as an adsorbent into an adsorption hydrogen storage tank; the activated hydrogen storage alloy powder desorbs the hydrogen adsorbed during the activation process by vacuum desorption and/or inert gas purging.
the vacuum desorption process comprises: communicating a reverse-release gas outlet of the adsorption hydrogen storage tank with an inlet of a vacuum pump, and opening the reverse-release gas outlet to reduce the pressure of the reverse-release gas outlet to vacuum reverse-release pressure; the activated hydrogen storage alloy powder is made to desorb the hydrogen gas adsorbed in the activation process.
The inert gas purging process comprises: and opening a reverse-air outlet of the adsorption hydrogen storage tank, and continuously blowing the reverse-air outlet by inert gas under normal pressure to ensure that the activated hydrogen storage alloy powder desorbs the hydrogen adsorbed in the activation process.
And opening a raw material gas inlet of the adsorption hydrogen storage tank, and introducing the gas difficult to adsorb into the adsorption hydrogen storage tank to increase the pressure of the adsorption hydrogen storage tank until the adsorption pressure is reached.
And sending the mixed gas to be purified containing hydrogen into an adsorption hydrogen storage tank through a feed gas inlet, simultaneously opening a gas outlet of the adsorption hydrogen storage tank, so that hydrogen components in the mixed gas to be purified react with the adsorbent to be adsorbed, and discharging and collecting residual gas components serving as gas difficult to be adsorbed from the gas outlet. The difficult adsorption gas comprises any one or a mixture of a plurality of nitrogen, oxygen, rare gases, carbon monoxide, carbon dioxide and hydrocarbon gas.
when the adsorbent reaches adsorption saturation, closing the feed gas inlet; further reducing the external pressure of the gas outlet to the forward pressure, continuously discharging and collecting the residual gas in the adsorption hydrogen storage tank, and gradually reducing the internal pressure of the adsorption hydrogen storage tank until the external pressure is the same as the external pressure of the gas outlet; the cis-bleeding pressure is less than the adsorption pressure. Saturation of adsorption is typically reflected by the pressure of the adsorbent bed and can be obtained experimentally.
And closing the gas outlet, opening a reverse gas outlet of the adsorption hydrogen storage tank, and enabling the pressure of the reverse gas outlet, namely the reverse release pressure is lower than the forward release pressure, so that the hydrogen adsorbed by the adsorbent in the adsorption hydrogen storage tank can be released in the reverse direction of adsorption, and the purified hydrogen flows out through the reverse gas outlet and is collected and stored.
Communicating a reverse-release gas outlet of the adsorption hydrogen storage tank with an inlet of a vacuum pump, reducing the pressure of the reverse-release gas outlet to vacuum reverse-release pressure, further releasing hydrogen adsorbed by the adsorbent in the adsorption hydrogen storage tank, regenerating the adsorbent, and discharging and collecting purified hydrogen from the outlet of the vacuum pump; the purity of the purified hydrogen reaches more than 99.9 percent and the primary yield can reach more than 90 percent.
And (4) repeatedly using the regenerated adsorbent to adsorb the mixed gas to be purified, namely repeating the process.
In the hydrogen medium temperature pressure swing adsorption purification method, the adsorption pressure is greater than the forward release pressure and the reverse release pressure is greater than the vacuum reverse release pressure. For example, the adsorption pressure is 10bar, the forward pressure can be 4bar, and the reverse pressure is 1 bar.
example 1: preparation of medium-temperature magnesium lanthanum hydrogen storage alloy
The magnesium-lanthanum alloy has large hydrogen absorption capacity at medium temperature and better adsorption kinetics. The method for preparing the antitoxic magnesium-lanthanum hydrogen storage alloy comprises the following steps:
Weighing magnesium powder and lanthanum fluoride powder with the granularity of less than 1mm, mixing the magnesium powder and the lanthanum fluoride powder according to the molar ratio of 10:1, and ball-milling the mixture for 48 hours by using a ball mill under the atmosphere of argon and ten atmospheric pressures;
A small amount of hydrochloric acid is additionally added into the potassium fluoride solution with the concentration of 6g/L, and the pH value of the solution is controlled to be 2.6-3.0;
Placing the obtained alloy powder in the obtained acid potassium fluoride solution, and mixing and stirring for 120 min;
and (3) carrying out suction filtration on the stirred solution, washing the obtained solid with ethanol for 1 time, washing the solid with deionized water for more than 4 times, placing the solid in a drying furnace, and drying the solid for 14 hours at the temperature of 60 ℃ to obtain the toxicity-resistant magnesium-lanthanum hydrogen storage alloy.
For comparison with example 1, the preparation method of comparative condition 1 is the most industrially used melting method, and the surface of the magnesium lanthanum alloy prepared is not fluorinated. The antitoxic performance of example 1 and control 1 is shown in FIG. 2, control 1 in CO2And the deterioration occurs in gases such as CO, and the hydrogen absorption capacity is remarkably reduced.
Example 2: medium-temperature purification of ethanol reforming shift gas
the method is characterized in that ethanol reforming conversion gas is used as a raw material, medium-temperature magnesium-nickel hydrogen storage alloy is used for pressure swing adsorption separation, and the raw material gas components are shown in table 1:
TABLE 1 typical ethanol reforming shift gas composition
| components | CO2(％) | CO(％) | H2(％) |
| concentration of | 15-20 | 10-15 | 65-75 |
in the adsorption process, the temperature of the adsorption hydrogen storage tank is kept at about 350 ℃, the adsorption pressure is 2MPa, and the desorption pressure is 0.02 MPa. Table 2 shows the comparison of the process of the present invention with other prior art shifted gas purification processes. The process system of the invention has smaller scale, simple equipment, easy miniaturization and even portability, and has good application prospect in a distributed energy network. In addition, the purity of the hydrogen obtained by the method can be stabilized to be more than 99.9 percent, and the theoretical highest purity can reach more than 99.999 percent; on the premise that the purity of the hydrogen is 99.9%, the yield of the hydrogen can reach more than 95%, which is obviously higher than that of the existing pressure swing adsorption process. Compared with low-temperature methanol washing, the method has the advantages of low investment on process equipment, no need of cooling the synthesis gas, no need of a complex heat exchange structure, cold quantity saving and unique advantage.
TABLE 2 comparison of the process of the present invention with other process shift gas purifications
| the process of the invention | existing pressure swing adsorption | Low temperature methanol wash | |
| Operating temperature | 300～450℃ | About 40 DEG C | -40℃ |
| System scale | miniature or medium-small size | Middle and small sized | Large scale |
| Complexity of the apparatus | Simple and easy | in general | Complexity of |
| Purity of hydrogen | >99.9％ | 99.9％ | 99.9％ |
| Yield of hydrogen | More than 95 percent | About 85 percent | >99％ |
example 3: fuel cell system for producing hydrogen by reforming diesel oil
The fuel cell system for reforming diesel oil to prepare hydrogen is an ideal portable power generation device, uses easily available diesel oil as fuel, is easy to supply fuel, has high power generation efficiency, no pollution, low working noise and low working temperature, and has unique advantages compared with diesel engines and lithium batteries.
In the reformed synthetic gas of diesel oil, the main component is CO2、CO、H2、H2S, hydrocarbons, etc.; proton Exchange Membrane Fuel Cells (PEMFC) have high requirements on hydrogen purity of fuel and CO2The concentration is lower than 2ppm, the CO concentration is lower than 0.2ppm, and the hydrogen purification depth and the purification system are related to the service life of the PEMFC and the portability of the whole power generation system.
The purification system and the process provided by the invention are suitable for a fuel cell system for producing hydrogen by reforming diesel. The purification unit comprises a pretreatment tank, an adsorption hydrogen storage tank and a hydrogen storage tank. The pretreatment tank is used for removing most of water vapor, hydrogen sulfide, benzene vapor, naphthalene vapor and other toxic gases in the diesel reforming synthesis gas, the adsorption hydrogen storage tank is used for removing other impurity gases, and the obtained high-purity hydrogen is introduced into the hydrogen storage tank to provide stable and continuous hydrogen for the fuel cell. Half of the hydrogen produced in the vacuum desorption stage of the adsorption gas storage tank is supplied to the fuel cell, and the other half is introduced into the hydrogen storage tank for storage.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. the preparation method of the medium-temperature hydrogen storage alloy is characterized in that the medium-temperature hydrogen storage alloy comprises magnesium and/or compounds thereof and functional metals and/or compounds thereof, wherein the functional metals comprise any one or a mixture of more of nickel, iron, titanium, lanthanum, cerium, strontium, chromium, zinc, vanadium and cobalt; the mass percentage of the magnesium and/or the compound thereof is more than 50 percent; the preparation method comprises the following steps:
Weighing a proper amount of magnesium and/or compounds thereof, weighing a proper amount of functional metal and/or compounds thereof, and uniformly mixing to obtain a metal raw material;
putting the metal raw material into a medium-frequency electromagnetic induction smelting furnace for smelting to obtain metal alloy with uniform components;
weighing a proper amount of carbon material, mixing the metal alloy with the carbon material, and grinding by a ball mill to obtain a metal hydrogen storage material with the granularity of millimeter;
and (2) dipping and stirring the metal hydrogen storage material by using an acidic potassium fluoride solution, then filtering, washing with water and drying to obtain the medium-temperature hydrogen storage alloy powder with antitoxic property.
2. A method for preparing an intermediate-temperature hydrogen storage alloy according to claim 1, characterized in that said method further comprises: the metal raw material is placed in a medium-frequency electromagnetic induction smelting furnace to be smelted for more than 3 times to obtain the metal alloy with uniform components.
3. A method for preparing an intermediate-temperature hydrogen storage alloy according to claim 1, wherein the carbon material comprises any one or more of activated carbon powder, carbon molecular sieve, carbon fiber and carbon nanotube, and the mass percentage x of the carbon material isCIs 0<xC<5％。
4. A preparation method of an intermediate-temperature hydrogen storage alloy according to claim 1, wherein the ball mill is used for grinding in an inert atmosphere, the grinding time is 5-1000 h, and the grinding pressure is more than 0.1 MPa.
5. A method for preparing an intermediate-temperature hydrogen storage alloy according to claim 1, wherein the concentration of the potassium fluoride solution is 3-9 g/L, and the pH value of the solution is 1-6.
6. A hydrogen medium temperature pressure swing adsorption purification method is characterized in that the purification method uses a purification system comprising an adsorption hydrogen storage tank and a vacuum pump; one end of the adsorption hydrogen storage tank is provided with a raw material gas inlet and a reverse-release gas outlet, and the other end is provided with a gas outlet; the method comprises the following steps;
Filling the medium-temperature hydrogen storage alloy powder prepared according to claim 1 into an adsorption hydrogen storage tank as an adsorbent;
opening a raw material gas inlet of the adsorption hydrogen storage tank, and introducing a gas difficult to adsorb into the adsorption hydrogen storage tank to increase the pressure of the adsorption hydrogen storage tank until the adsorption pressure is reached;
Sending the mixed gas to be purified containing hydrogen into an adsorption hydrogen storage tank through a feed gas inlet, simultaneously opening a gas outlet of the adsorption hydrogen storage tank to enable hydrogen components in the mixed gas to be purified to react with the adsorbent to be adsorbed, and discharging and collecting residual gas components serving as gas difficult to be adsorbed from the gas outlet;
When the adsorbent reaches adsorption saturation, closing the feed gas inlet; further reducing the external pressure of the gas outlet to the forward pressure, continuously discharging and collecting the residual gas in the adsorption hydrogen storage tank, and gradually reducing the internal pressure of the adsorption hydrogen storage tank until the external pressure is the same as the external pressure of the gas outlet; the cis-relieving pressure is less than the adsorption pressure;
Closing the gas outlet, opening a reverse-gas outlet of the adsorption hydrogen storage tank, and enabling the pressure of the reverse-gas outlet to be lower than the forward-discharge pressure, so that the hydrogen adsorbed by the adsorbent in the adsorption hydrogen storage tank can be released in the reverse direction of adsorption, and the purified hydrogen flows out through the reverse-gas outlet and is collected and stored;
communicating a reverse-release gas outlet of the adsorption hydrogen storage tank with an inlet of a vacuum pump, reducing the pressure of the reverse-release gas outlet to vacuum reverse-release pressure, further releasing hydrogen adsorbed by the adsorbent in the adsorption hydrogen storage tank, regenerating the adsorbent, and discharging and collecting purified hydrogen from the outlet of the vacuum pump;
And repeatedly using the regenerated adsorbent for adsorbing the mixed gas to be purified.
7. A medium temperature pressure swing adsorption purification process for hydrogen as claimed in claim 6, further comprising;
Activating the intermediate-temperature hydrogen storage alloy powder prepared according to claim 1 into activated hydrogen storage alloy powder in a hydrogen atmosphere, wherein the activation temperature is 100-500 ℃;
Filling activated hydrogen storage alloy powder serving as an adsorbent into an adsorption hydrogen storage tank; desorbing the hydrogen adsorbed in the activation process by the activated hydrogen storage alloy powder through vacuum desorption and/or inert gas purging;
and opening a raw material gas inlet of the adsorption hydrogen storage tank, and introducing the gas difficult to adsorb into the adsorption hydrogen storage tank to increase the pressure of the adsorption hydrogen storage tank until the adsorption pressure is reached.
8. A medium temperature pressure swing adsorption purification method of hydrogen as claimed in claim 6, wherein said vacuum desorption process comprises:
communicating a reverse-release gas outlet of the adsorption hydrogen storage tank with an inlet of a vacuum pump, and opening the reverse-release gas outlet to reduce the pressure of the reverse-release gas outlet to vacuum reverse-release pressure; the activated hydrogen storage alloy powder is made to desorb the hydrogen gas adsorbed in the activation process.
9. A medium temperature pressure swing adsorption purification method of hydrogen as claimed in claim 6, wherein the inert gas purge process comprises:
And opening a reverse-air outlet of the adsorption hydrogen storage tank, and continuously blowing the reverse-air outlet by inert gas under normal pressure to ensure that the activated hydrogen storage alloy powder desorbs the hydrogen adsorbed in the activation process.
10. a medium temperature Pressure Swing Adsorption (PSA) purification method of hydrogen as claimed in claim 6, wherein the mixed gas to be purified comprises hydrogen and a gas which is difficult to adsorb; the difficult-to-adsorb gas comprises any one or more of nitrogen, oxygen, rare gas, carbon monoxide, carbon dioxide and hydrocarbon gas.
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