CN114870907B - Regeneration method of denitration catalyst for alkali/alkaline earth metal poisoning - Google Patents
Regeneration method of denitration catalyst for alkali/alkaline earth metal poisoning Download PDFInfo
- Publication number
- CN114870907B CN114870907B CN202210662174.9A CN202210662174A CN114870907B CN 114870907 B CN114870907 B CN 114870907B CN 202210662174 A CN202210662174 A CN 202210662174A CN 114870907 B CN114870907 B CN 114870907B
- Authority
- CN
- China
- Prior art keywords
- alkali
- alkaline earth
- earth metal
- catalyst
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910052784 alkaline earth metal Inorganic materials 0.000 title claims abstract description 178
- 239000003054 catalyst Substances 0.000 title claims abstract description 151
- 150000001342 alkaline earth metals Chemical class 0.000 title claims abstract description 93
- 239000003513 alkali Substances 0.000 title claims abstract description 88
- 206010027439 Metal poisoning Diseases 0.000 title claims abstract description 67
- 238000011069 regeneration method Methods 0.000 title claims abstract description 26
- 238000004140 cleaning Methods 0.000 claims abstract description 53
- 239000012459 cleaning agent Substances 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 33
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 24
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000005587 bubbling Effects 0.000 claims abstract description 19
- 239000008367 deionised water Substances 0.000 claims abstract description 18
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 18
- 230000001172 regenerating effect Effects 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims abstract description 12
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims abstract description 12
- 239000001099 ammonium carbonate Substances 0.000 claims abstract description 12
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 12
- 239000002738 chelating agent Substances 0.000 claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- 150000002500 ions Chemical class 0.000 claims abstract description 12
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 12
- 239000011259 mixed solution Substances 0.000 claims abstract description 8
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 10
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- -1 polyoxyethylene oleic acid Polymers 0.000 claims description 6
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 150000001413 amino acids Chemical class 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 231100000572 poisoning Toxicity 0.000 abstract description 2
- 230000000607 poisoning effect Effects 0.000 abstract description 2
- 238000004506 ultrasonic cleaning Methods 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 58
- 230000008569 process Effects 0.000 description 16
- 230000008929 regeneration Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 10
- 239000003546 flue gas Substances 0.000 description 10
- 239000011148 porous material Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 229910052783 alkali metal Inorganic materials 0.000 description 5
- 150000001340 alkali metals Chemical class 0.000 description 5
- 230000009849 deactivation Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003804 effect on potassium Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
Classifications
-
- 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
- B01J38/00—Regeneration or reactivation of catalysts, in general
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/90—Regeneration or reactivation
- B01J23/92—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/613—10-100 m2/g
-
- 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
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/02—Heat treatment
-
- 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
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/50—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids
- B01J38/52—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids oxygen-containing
-
- 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
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/60—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using acids
-
- 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
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/64—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using alkaline material; using salts
- B01J38/66—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using alkaline material; using salts using ammonia or derivatives thereof
-
- 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
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/74—Regeneration or reactivation of catalysts, in general utilising ion-exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- 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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention provides a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst, which comprises the following steps: (1) Sequentially carrying out dry ash removal, wet ash removal and ash and scale softening on an alkali/alkaline earth metal poisoning denitration catalyst; (2) Preparing a first cleaning agent, namely placing the catalyst treated in the step (1) into the first cleaning agent, and performing compressed air bubbling cleaning, wherein the first cleaning agent is a mixed solution of sulfuric acid, ammonium fluoride, a dispersing agent, a nonionic surfactant and deionized water; (3) Preparing a second cleaning agent, and then placing the catalyst in the second cleaning agent, wherein the second cleaning agent is a mixed solution of ammonium chloride, ammonium bicarbonate, an ion chelating agent and deionized water by adopting ultrasonic cleaning; (4) drying the catalyst. The regeneration method provided by the invention can effectively remove alkali/alkaline earth metal components which cause catalyst poisoning, and the loss of original active components in the catalyst is very small, so that the regeneration method has good economic benefit.
Description
Technical Field
The invention belongs to the field of denitration catalyst regeneration, and particularly relates to a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst.
Background
With the implementation of ultra-low emission policies in the electric and non-electric industries in recent years, the SCR denitration technology has been widely applied to industries such as glass, cement, sludge co-combustion, biomass incineration and the like. In the SCR process, the catalyst is deactivated due to high ash, high alkali/alkaline earth metals, and the denitration performance is deteriorated. Catalyst alkali/alkaline earth metal poisoning is a common problem faced by denitration in various industries. The alkali/alkaline earth metal poisoning of the catalyst under the condition of high alkali fume in various industries has multiple components and complexity, and the difficulty is caused for recovering the activity of the deactivated catalyst.
The soluble alkali metal released during combustion of fuel and the free alkali/alkaline earth metal in fly ash are main factors causing the poisoning and deactivation of the SCR catalyst, especially when fuel with higher alkali/alkaline earth metal content is burned, if the alkali/alkaline earth metal with high concentration is directly contacted with the surface of the catalyst, the alkali/alkaline earth metal can be directly adsorbed on the active position of the catalyst, and occupy the acid position of the surface of the catalyst to deactivate the catalyst, so that the SCR catalyst is quickly deactivated. The denitration of boiler flue gas using biomass as fuel is subject to more serious deactivation of alkali/alkaline earth metal poisoning of the catalyst, wherein the content of potassium salt in biomass combustion flue gas is 2-4 times higher than that in a coal-fired power plant. The operation flue gas conditions of the SCR catalyst are greatly different from those of the coal-fired power plant due to the arrangement of various devices and the limitation of temperature intervals of the cement kiln, for example, the content of smoke dust can be several times that of the coal-fired power plant, the alkali/alkaline earth metal content in the smoke dust is tens of times that of the coal-fired power plant, the SCR catalyst is easy to generate a rapid deactivation phenomenon in the cement kiln due to the influence of the factors, and the activity attenuation of the SCR catalyst of the cement kiln is obviously worse than that of the coal-fired power plant from the practical understanding. Because of the unique technological characteristics of the glass kiln, a large amount of alkaline earth metals such as Ca and Mg are carried in the flue gas, and a large amount of alkaline earth metals are deposited on the surface of the catalyst, so that the catalyst can be quickly deactivated. Therefore, it is important to find a method for removing alkali/alkaline earth metals on the surface of the denitration catalyst, so that the denitration catalyst can be regenerated and reused.
However, the existing regeneration method for the alkali/alkaline earth metal poisoning denitration catalyst can only clean conventional ash and trace alkali/alkaline earth metal, but cannot regenerate the alkali/alkaline earth metal poisoning catalyst under high-alkali flue gas, and has the problems of complex operation, long cleaning time, high active component loss rate and the like.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst.
The invention adopts the technical scheme that:
the invention provides a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst, which comprises the following steps:
(1) Sequentially carrying out dry ash removal, wet ash removal and ash and scale softening on an alkali/alkaline earth metal poisoning denitration catalyst;
(2) Preparing a first cleaning agent, and placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (1) into the first cleaning agent, and cleaning under the condition of compressed air bubbling, wherein the first cleaning agent is a mixed solution of sulfuric acid, ammonium fluoride, a dispersing agent, a nonionic surfactant and deionized water;
(3) Preparing a second cleaning agent, and placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (2) into the second cleaning agent, and cleaning under ultrasonic conditions, wherein the second cleaning agent is a mixed solution of ammonium chloride, ammonium bicarbonate, an ion chelating agent and deionized water;
(4) Drying the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (3);
the alkali/alkaline earth metal poisoning denitration catalyst is an alkali metal and/or alkaline earth metal poisoning denitration catalyst.
According to the regeneration method of the alkali/alkaline earth metal poisoning denitration catalyst, provided by the embodiment of the invention, the alkali/alkaline earth metal poisoning denitration catalyst is subjected to graded cleaning by directionally preparing two different cleaning agents, so that the alkali/alkaline earth metal in the catalyst is further and efficiently directionally removed on the basis of removing substances such as silicon aluminum and the like in conventional ash scale, the deactivation caused by the occupation of active sites by the alkali/alkaline earth metal can be recovered, the loss of original active components in the catalyst is very small, and the catalyst has good economic benefit and application prospect.
In some embodiments, the first cleaning agent has a mass content of 0.1 to 1wt% of sulfuric acid, a mass content of 0.2 to 0.5wt% of ammonium fluoride, a mass content of 1 to 1.5wt% of dispersant, and a mass content of 1 to 1.8wt% of nonionic surfactant, wherein sulfuric acid is used as a main acid source of the cleaning agent, and is subjected to ion exchange with ammonium fluoride, so that a worm-shaped accumulated ash and scale component in microscopic pore channels of the catalyst can be partially dissolved; the dispersing agent can ensure that ash and dirt stripped from the catalyst are not easy to agglomerate, keep dispersion, and are more beneficial to cleaning and removal; the nonionic surfactant is used as an effective component of the detergent, can change the contact performance of the ash and the scale on the surface of the catalyst, and promotes the stripping and the removal of the ash and the scale on the surface of the pore canal.
In some embodiments, the dispersant is one or a combination of more than two of ethylene oxide condensate, sodium carboxymethyl cellulose, polydiethanol and polyacrylic acid, and the nonionic surfactant is one or a mixture of alkylphenol ethoxylates and polyoxyethylene oleic acid.
In some embodiments, the mass content of the ammonium chloride in the second cleaning agent is 0.5-1 wt%, the mass content of the ammonium bicarbonate is 0.2-0.5 wt%, and the mass content of the ion chelating agent is 0.01-0.1 wt%, wherein the ammonium chloride is used as a main source of ammonium ions, has a good replacement effect on potassium sodium in the catalyst, and can efficiently realize comprehensive and rapid removal and dissolution of alkali metal in the catalyst; the ammonium bicarbonate can chemically react with alkaline earth metal, and the alkaline earth metal is removed under the action of the subacidity of the solution; ion chelating agents are capable of complexing with a wide variety of metal impurities, thereby effectively removing alkali/alkaline earth metal components from the catalyst.
In some embodiments, the ion chelating agent is one or a combination of two or more of glycolic acid, ethylenediamine tetraacetic acid, amino acids, citric acid, oxalic acid.
In some embodiments, in the step (2), the temperature during cleaning is 30-40 ℃, the cleaning time is 60-120 min, the first cleaning agent can play a better role in the temperature range of 30-40 ℃, and the bubbling process is performed by introducing gas in the cleaning process, so that the contact surface of the first cleaning agent and the catalyst is promoted, the flowability of the solution is enhanced, and the carry-out of ash and dirt in the catalyst is accelerated.
In some embodiments, in step (3), the temperature during the cleaning is 30-40 ℃ and the cleaning time is 10-60 min; the frequency of the ultrasonic wave is 20-80 Hz, the ultrasonic wave process is easy to generate heat, the water temperature is required to be maintained to be not excessively increased, and the temperature is maintained to be 30-40 ℃.
In some embodiments, the alkali/alkaline earth metal poisoning denitration catalyst treated in step (3) is subjected to clear water bubbling flushing for 10-60 min before step (4).
In some embodiments, in the step (4), the temperature of the drying treatment is 150-300 ℃, the drying heating rate is not more than 6 ℃/min, and the cooling rate is not more than 6 ℃/min.
In some embodiments, in step (1), the step of dry ash removal is: firstly, removing floating ash on the surface of the denitration catalyst poisoned by alkali/alkaline earth metal, and then purging by using compressed air; the wet ash removal step comprises the following steps: spraying deionized water to the catalyst subjected to dry ash removal treatment to wash and remove ash; the steps of softening ash and scale are as follows: the catalyst after wet ash removal treatment is soaked in desalted water, and meanwhile, compressed air bubbling is adopted to clean the catalyst.
The invention has the advantages and beneficial effects that:
the regeneration method of the alkali/alkaline earth metal poisoning denitration catalyst provided by the embodiment of the invention adopts a staged cleaning mode, firstly cleans substances such as silicon aluminum in conventional ash scale of the alkali/alkaline earth metal poisoning denitration catalyst through a first cleaning agent, simultaneously removes a small amount of conventional deactivated parts such as alkali/alkaline earth metal, and secondly removes alkali/alkaline earth metal in a high-efficiency and directional manner through a second cleaning agent.
Detailed Description
The following detailed description of embodiments of the invention is exemplary and intended to be illustrative of the invention and not to be construed as limiting the invention.
The invention provides a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst, which comprises the following steps:
(1) Sequentially carrying out dry ash removal, wet ash removal and ash and scale softening on an alkali/alkaline earth metal poisoning denitration catalyst;
(2) Preparing a first cleaning agent, and placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (1) into the first cleaning agent to clean under the condition of compressed air bubbling, wherein the first cleaning agent is a mixed solution of sulfuric acid, ammonium fluoride, a dispersing agent, a nonionic surfactant and deionized water;
(3) Preparing a second cleaning agent, and placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (2) into the second cleaning agent to clean under the ultrasonic condition, wherein the second cleaning agent is a mixed solution of ammonium chloride, ammonium bicarbonate, an ion chelating agent and deionized water;
(4) Drying the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (3);
the alkali/alkaline earth metal poisoning denitration catalyst is an alkali metal and/or alkaline earth metal poisoning denitration catalyst.
According to the regeneration method of the alkali/alkaline earth metal poisoning denitration catalyst, provided by the embodiment of the invention, the alkali/alkaline earth metal poisoning denitration catalyst is subjected to graded cleaning by directionally preparing two different cleaning agents, so that the alkali/alkaline earth metal in the catalyst is further and efficiently directionally removed on the basis of removing substances such as silicon aluminum and the like in conventional ash scale, the deactivation caused by the occupation of active sites by the alkali/alkaline earth metal can be recovered, the loss of original active components in the catalyst is very small, and the catalyst has good economic benefit and application prospect.
In some embodiments, the first cleaning agent has a sulfuric acid mass content of 0.1-1 wt%, an ammonium fluoride mass content of 0.2-0.5 wt%, a dispersant mass content of 1-1.5 wt%, and a nonionic surfactant mass content of 1-1.8 wt%, wherein the sulfuric acid serves as a main acidic source of the cleaning agent, performs ion exchange with the ammonium fluoride, and is capable of partially dissolving vermicular packed ash components in microscopic channels of the catalyst; the dispersing agent can ensure that ash and dirt stripped from the catalyst are not easy to agglomerate, keep dispersion, and are more beneficial to cleaning and removal; the nonionic surfactant is used as an effective component of the detergent, can change the contact performance of the ash and the scale on the surface of the catalyst, and promotes the stripping and the removal of the ash and the scale on the surface of the pore canal.
In some embodiments, the dispersant is one or a combination of more than two of ethylene oxide condensate, sodium carboxymethyl cellulose, polydiethanol, polyacrylic acid, and the nonionic surfactant is one or a mixture of alkylphenol ethoxylates and polyoxyethylene oleic acid.
In some embodiments, in the second cleaning agent, the mass content of ammonium chloride is 0.5-1 wt%, the mass content of ammonium bicarbonate is 0.2-0.5 wt%, and the mass content of ion chelating agent is 0.01-0.1 wt%, wherein the ammonium chloride is used as a main source of ammonium ions, has a good replacement effect on potassium sodium in the catalyst, and can efficiently realize the complete and rapid removal and dissolution of alkali metal in the catalyst; the ammonium bicarbonate can chemically react with alkaline earth metal, and the alkaline earth metal is removed under the action of the subacidity of the solution; ion chelating agents are capable of complexing with a wide variety of metal impurities, thereby effectively removing alkali/alkaline earth metal components from the catalyst.
In some embodiments, the ion chelating agent is one or a combination of two or more of glycolic acid, ethylenediamine tetraacetic acid, amino acids, citric acid, oxalic acid.
In some embodiments, in the step (2), the temperature during cleaning is 30-40 ℃, the cleaning time is 60-120 min, the first cleaning agent can play a better role in the temperature range of 30-40 ℃, and the bubbling process is performed by introducing gas in the cleaning process, so that the contact surface of the first cleaning agent and the catalyst is promoted, the flowability of the solution is enhanced, and the carry-out of ash and dirt in the catalyst is accelerated.
In some embodiments, in step (3), the temperature during the cleaning is 30-40 ℃ and the cleaning time is 10-60 min; the frequency of the ultrasonic wave is 20-80 Hz, the ultrasonic wave process is easy to generate heat, the water temperature is required to be kept at 30-40 ℃ without excessively rising.
In some embodiments, the alkali/alkaline earth metal poisoning denitration catalyst treated in step (3) is subjected to clear water bubbling flushing for 10-60 min before step (4).
In some embodiments, in step (4), the temperature of the drying process is 150-300 ℃, the drying temperature rise rate is not more than 6 ℃/min, and the cooling rate is not more than 6 ℃/min.
In some embodiments, in step (1), the step of dry ash removal is: firstly, removing floating ash on the surface of the denitration catalyst poisoned by alkali/alkaline earth metal, and then purging by using compressed air; the wet ash removal step comprises the following steps: spraying deionized water to the catalyst subjected to dry ash removal treatment to wash and remove ash; the ash and scale softening step comprises the following steps: the catalyst after wet ash removal treatment is soaked in desalted water, and meanwhile, compressed air bubbling is adopted to clean the catalyst.
In embodiments 1-3 of the present invention, the dry ash removal comprises the following steps: the method comprises the steps of manually removing floating ash on the outer surface of a catalyst frame by using a catalyst module needing a regeneration process, placing the catalyst module in an automatic soot blowing device room, and purging the catalyst unit body one by one from a windward side and a leeward side of the catalyst unit body by utilizing compressed air sprayed by a compressed air spray nozzle; when purging, the region where the fly ash is splashed back by the airflow is judged to be blocked by the deposited ash, and at the moment, the compressed air nozzle can be purged repeatedly by slightly shaking about 10 degrees respectively by taking the connecting line of the flow channel and the nozzle as an axis until no fly ash splashes back.
In the embodiments 1-3 of the present invention, the specific steps of wet ash removal are: the catalyst module after the dry ash removal treatment is moved to a regeneration spray system, and deionized water is sprayed by a high-pressure water gun to carry out preliminary automatic cleaning on the catalyst; after the automatic flushing is finished, manually flushing the catalyst by using a high-pressure water gun to remove ash, removing all ash deposited on the windward side and the outer shell, removing most of loose ash deposited on or blocked in the flue gas flow passage, and removing and loosening hard ash deposited in part of the flue gas flow passage; in the cleaning process, whether the catalyst pore canal is blocked by accumulated ash or not is judged by naked eyes, or an area where water flow splashes back is judged to be an accumulated ash blocking area, and at the moment, the water gun can be slightly swung by about 10 degrees respectively by taking the connecting line of the flow channel and the water gun as an axis until the catalyst pore canal is completely dredged; if a harder soot is present, the rinsing is continued for at least 30 seconds, in an effort to soften the soot, facilitating its removal.
In the embodiments 1-3 of the present invention, the specific steps of softening ash scale are: and (3) immersing the catalyst module subjected to wet ash removal treatment into a desalting water tank completely, and cleaning the catalyst module by adopting compressed air bubbling disturbance, wherein the cleaning process lasts for 60min so as to soften dirt.
The method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst according to the present invention will be described in further detail by way of specific examples.
Example 1
The embodiment provides a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst, which comprises the following steps:
(1) Sequentially carrying out dry ash removal, wet ash removal and ash and scale softening on an alkali/alkaline earth metal poisoning denitration catalyst;
(2) Preparing a first cleaning agent: adding 0.8wt% sulfuric acid, 0.4wt% ammonium fluoride, 1.1wt% ethylene oxide condensate and 1.5wt% alkylphenol ethoxylate into deionized water, stirring uniformly at normal temperature, and standing; placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (1) in a first cleaning agent, and cleaning under the condition of compressed air bubbling, wherein the cleaning temperature is kept at 30 ℃ during cleaning, and the cleaning process lasts for 120min;
(3) Preparing a second cleaning agent: adding 0.8wt% of ammonium chloride, 0.3wt% of ammonium bicarbonate and 0.06wt% of glycolic acid into deionized water, and uniformly stirring at normal temperature; placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (2) in a second cleaning agent, cleaning under ultrasonic conditions, wherein the ultrasonic frequency is 40Hz, and the cleaning process lasts for 60min while the cleaning temperature is kept at 30 ℃; after cleaning, the catalyst is subjected to bubbling washing by clean water, and the surface residues are removed for 30min;
(4) And (3) drying the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (3) at 220 ℃.
Example 2
The embodiment provides a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst, which comprises the following steps:
(1) Sequentially carrying out dry ash removal, wet ash removal and ash and scale softening on an alkali/alkaline earth metal poisoning denitration catalyst;
(2) Preparing a first cleaning agent: adding 0.5wt% sulfuric acid, 0.3wt% ammonium fluoride, 1.2wt% sodium carboxymethyl cellulose and 1.5wt% alkylphenol ethoxylate into deionized water, stirring uniformly at normal temperature, and standing; placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (1) in a first cleaning agent, and cleaning under the condition of compressed air bubbling, wherein the cleaning temperature is kept at 30 ℃ during cleaning, and the cleaning process lasts for 120min;
(3) Preparing a second cleaning agent: adding 0.8wt% of ammonium chloride, 0.3wt% of ammonium bicarbonate and 0.06wt% of glycolic acid into deionized water, and uniformly stirring at normal temperature; placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (2) in a second cleaning agent, cleaning under ultrasonic conditions, wherein the ultrasonic frequency is 40Hz, and the cleaning process lasts for 60min while the cleaning temperature is kept at 30 ℃; after cleaning, the catalyst is subjected to bubbling washing by clean water, and the surface residues are removed for 30min;
(4) And (3) drying the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (3) at 220 ℃.
Example 3
The embodiment provides a method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst, which comprises the following steps:
(1) Sequentially carrying out dry ash removal, wet ash removal and ash and scale softening on an alkali/alkaline earth metal poisoning denitration catalyst;
(2) Preparing a first cleaning agent: adding 0.8wt% sulfuric acid, 0.4wt% ammonium fluoride, 1.1wt% ethylene oxide condensate and 1.5wt% alkylphenol ethoxylate into deionized water, stirring uniformly at normal temperature, and standing; placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (1) in a first cleaning agent, and cleaning under the condition of compressed air bubbling, wherein the cleaning temperature is kept at 30 ℃ during cleaning, and the cleaning process lasts for 120min;
(3) Preparing a second cleaning agent: adding 0.6wt% of ammonium chloride, 0.2wt% of ammonium bicarbonate and 0.04wt% of EDTA into deionized water, and uniformly stirring at normal temperature; placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (2) in a second cleaning agent, cleaning under ultrasonic conditions, wherein the ultrasonic frequency is 40Hz, and the cleaning process lasts for 60min while the cleaning temperature is kept at 30 ℃; after cleaning, the catalyst is subjected to bubbling washing by clean water, and the surface residues are removed for 30min;
(4) And (3) drying the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (3) at 220 ℃.
Experimental example 1
After the SCR denitration system runs for one year under certain high-alkali flue gas, the ammonia consumption of a reaction site is increased, ammonia escape is increased, and denitration performance is reduced. The reactor selects an alkali/alkaline earth metal poisoning denitration catalyst sample monomer for regeneration, the monomer is 18 multiplied by 18 holes, and the length is 980mm. The sample monomer of the alkali/alkaline earth metal poisoning denitration catalyst was regenerated in a laboratory using the above-described regeneration method, and the sample before regeneration (alkali/alkaline earth metal poisoning denitration catalyst without any treatment) and after regeneration (catalyst obtained after the regeneration treatment in examples 1 to 3) were subjected to physicochemical analysis and activity test, and the detection results were as follows:
test 1
Detecting activity: referring to DL/T1286-2013 technical Specification for detecting flue gas denitration catalyst in thermal power plants, the regenerated catalyst unit bodies are respectively put into a catalyst Chinese type test bench, simulated flue gas is introduced, and the performance of the catalyst is tested by heating. The simulated smoke comprises the following components: 180m of smoke volume 3 /h，O 2 (3vol.％)、H 2 O (5 vol.%), carrier gas was nitrogen, NO (350 mg/Nm) 3 ) Ammonia gas is introduced at an ammonia nitrogen molar ratio of 1:1, the test temperature is 380 ℃, and the activity detection results are shown in Table 1:
TABLE 1 Activity of catalyst before and after regeneration (unit m/h)
Activity results: as shown in Table 1, the activity of the alkali/alkaline earth metal poisoning denitration catalyst before regeneration was 36m/h; after regeneration, the activities of the alkali/alkaline earth metal poisoning denitration catalysts in the embodiment 1, the embodiment 2 and the embodiment 3 are respectively restored to 40.0m/h, 39.2m/h and 38.7m/h, and the activities of the regenerated catalysts are improved, which indicates that the overall performance of the regenerated catalysts is well improved.
Test 2
Detecting microscopic specific surface area: the specific surface area of the catalyst was measured by ASAP 2460BET surface area meter, and the measurement results are shown in Table 2:
TABLE 2 microcosmic specific surface area (unit m) of catalyst before and after regeneration 2 /mg)
Specific surface area results: as shown in table 2, the microscopic specific surface area of the alkali/alkaline earth metal poisoning denitration catalyst before regeneration is: 39.73m 2 /mg; after regeneration, the microscopic specific surface areas of the alkali/alkaline earth metal poisoning denitration catalysts of example 1, example 2 and example 3 of the present invention were respectively raised to 42.85m 2 /mg、41.26m 2 /mg、42.33m 2 And/mg, showing that the microscopic pore canal of the regenerated catalyst is well dredged and the reaction area is recovered.
Test 3
XRF was used to detect other components in the pre-and post-regeneration catalyst samples, see table 3 for details:
TABLE 3 composition Table (unit:%) of catalyst before and after regeneration
As is clear from Table 3, the active material V in the regenerated catalyst sample 2 O 5 、WO 3 、MoO 3 Little loss and the main component SiO of ash scale 2 、Al 2 O 3 、CaO、MgO、Na 2 O、K 2 The O content is obviously reduced, thereby proving that the regeneration effect is good.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. A method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst is characterized by comprising the following steps of: the method comprises the following steps:
(1) Sequentially carrying out dry ash removal, wet ash removal and ash and scale softening on an alkali/alkaline earth metal poisoning denitration catalyst;
(2) Preparing a first cleaning agent, and placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (1) into the first cleaning agent, and cleaning under the condition of compressed air bubbling, wherein the first cleaning agent is a mixed solution of sulfuric acid, ammonium fluoride, a dispersing agent, a nonionic surfactant and deionized water; the temperature during cleaning is 30-40 ℃, and the cleaning time is 60-120 min;
(3) Preparing a second cleaning agent, and placing the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (2) into the second cleaning agent, and cleaning under ultrasonic conditions, wherein the second cleaning agent is a mixed solution of ammonium chloride, ammonium bicarbonate, an ion chelating agent and deionized water; in the second cleaning agent, the mass content of the ammonium chloride is 0.5-1 wt%, the mass content of the ammonium bicarbonate is 0.2-0.5 wt%, and the mass content of the ion chelating agent is 0.01-0.1 wt%; the temperature during cleaning is 30-40 ℃, and the cleaning time is 10-60 min; the frequency of the ultrasonic wave is 20-80 Hz;
(4) Drying the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (3); the temperature of the drying treatment is 150-300 ℃, the drying heating rate is not more than 6 ℃/min, and the cooling rate is not more than 6 ℃/min.
2. The method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst according to claim 1, characterized by: in the first cleaning agent, the mass content of sulfuric acid is 0.1-1 wt%, the mass content of ammonium fluoride is 0.2-0.5 wt%, the mass content of dispersing agent is 1-1.5 wt%, and the mass content of nonionic surfactant is 1-1.8 wt%.
3. The alkali/alkaline earth metal poisoning denitration catalyst regeneration method according to claim 1 or 2, characterized by: the dispersing agent is one or the combination of more than two of ethylene oxide condensate, sodium carboxymethyl cellulose, polydiethanol and polyacrylic acid, and the nonionic surfactant is one or the mixture of alkylphenol ethoxylates and polyoxyethylene oleic acid.
4. The method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst according to claim 1, characterized by: the ion chelating agent is one or more of glycolic acid, ethylenediamine tetraacetic acid, amino acid, citric acid and oxalic acid.
5. The method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst according to claim 1, characterized by: before the step (4), the alkali/alkaline earth metal poisoning denitration catalyst treated in the step (3) is subjected to clear water bubbling flushing for 10-60 min.
6. The method for regenerating an alkali/alkaline earth metal poisoning denitration catalyst according to claim 1, characterized by: in the step (1), the dry ash removal step comprises the following steps: firstly, removing floating ash on the surface of the denitration catalyst poisoned by alkali/alkaline earth metal, and then purging by using compressed air; the wet ash removal step comprises the following steps: spraying deionized water to the catalyst subjected to dry ash removal treatment to wash and remove ash; the steps of softening ash and scale are as follows: the catalyst after wet ash removal treatment is soaked in desalted water, and meanwhile, compressed air bubbling is adopted to clean the catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210662174.9A CN114870907B (en) | 2022-06-13 | 2022-06-13 | Regeneration method of denitration catalyst for alkali/alkaline earth metal poisoning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210662174.9A CN114870907B (en) | 2022-06-13 | 2022-06-13 | Regeneration method of denitration catalyst for alkali/alkaline earth metal poisoning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114870907A CN114870907A (en) | 2022-08-09 |
| CN114870907B true CN114870907B (en) | 2023-10-20 |
Family
ID=82682283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210662174.9A Active CN114870907B (en) | 2022-06-13 | 2022-06-13 | Regeneration method of denitration catalyst for alkali/alkaline earth metal poisoning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114870907B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974404A (en) * | 2012-11-22 | 2013-03-20 | 中节能六合天融环保科技有限公司 | Denitrification catalyst regeneration method |
| CN103350004A (en) * | 2013-08-02 | 2013-10-16 | 张权 | SCR denitrification catalyst regeneration method and mixture for SCR denitrification catalyst regeneration liquid |
| CN104226380A (en) * | 2014-09-24 | 2014-12-24 | 清华大学 | Method for regenerating flue gas denitration catalyst with high phosphorus and high alkali metal content |
| CN105080622A (en) * | 2015-09-14 | 2015-11-25 | 中建中环工程有限公司 | Regeneration method for inactivated selective catalytic reduction (SCR) denitration catalyst |
| CN106179528A (en) * | 2016-06-30 | 2016-12-07 | 大唐南京环保科技有限责任公司 | A kind of renovation process of alkali metal poisoning denitrating catalyst |
| CN108144656A (en) * | 2017-11-23 | 2018-06-12 | 浙江天蓝环保技术股份有限公司 | A kind of regenerated liquid and regeneration method for denitrating catalyst of being poisoned |
| CN113600248A (en) * | 2021-08-19 | 2021-11-05 | 苏州西热节能环保技术有限公司 | Thallium-poisoned denitration catalyst regeneration method |
| CN114471745A (en) * | 2022-04-06 | 2022-05-13 | 山东万达环保科技有限公司 | Regeneration method of SCR denitration catalyst and application of SCR denitration catalyst in denitration |
-
2022
- 2022-06-13 CN CN202210662174.9A patent/CN114870907B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974404A (en) * | 2012-11-22 | 2013-03-20 | 中节能六合天融环保科技有限公司 | Denitrification catalyst regeneration method |
| CN103350004A (en) * | 2013-08-02 | 2013-10-16 | 张权 | SCR denitrification catalyst regeneration method and mixture for SCR denitrification catalyst regeneration liquid |
| CN104226380A (en) * | 2014-09-24 | 2014-12-24 | 清华大学 | Method for regenerating flue gas denitration catalyst with high phosphorus and high alkali metal content |
| CN105080622A (en) * | 2015-09-14 | 2015-11-25 | 中建中环工程有限公司 | Regeneration method for inactivated selective catalytic reduction (SCR) denitration catalyst |
| CN106179528A (en) * | 2016-06-30 | 2016-12-07 | 大唐南京环保科技有限责任公司 | A kind of renovation process of alkali metal poisoning denitrating catalyst |
| CN108144656A (en) * | 2017-11-23 | 2018-06-12 | 浙江天蓝环保技术股份有限公司 | A kind of regenerated liquid and regeneration method for denitrating catalyst of being poisoned |
| CN113600248A (en) * | 2021-08-19 | 2021-11-05 | 苏州西热节能环保技术有限公司 | Thallium-poisoned denitration catalyst regeneration method |
| CN114471745A (en) * | 2022-04-06 | 2022-05-13 | 山东万达环保科技有限公司 | Regeneration method of SCR denitration catalyst and application of SCR denitration catalyst in denitration |
Non-Patent Citations (3)
| Title |
|---|
| SCR脱硝催化剂失活及再生技术的研究进展;周惠 等;《无机盐工业》;第49卷(第5期);第9-13页 * |
| 燃煤电厂SCR脱硝催化剂的失活分析及再生探讨;段鑫磊;《低碳世界》;第9卷(第7期);第107-108页 * |
| 燃煤电厂商用SCR脱硝催化剂的失活机理及再生;王夫美 等;《环境工程》;第37卷(第6期);第16-21页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114870907A (en) | 2022-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111508824B (en) | Wool making cleaning method and heterojunction battery | |
| CN105536883B (en) | The dry reclamation method of using plasma processing failure SCR denitration | |
| CN110354914B (en) | Recycling method of inactivated SCR denitration catalyst | |
| CA2718246A1 (en) | Method of regeneration of scr catalyst | |
| CN104722206A (en) | Regeneration method of inactivated SCR denitration catalyst | |
| CN104707482A (en) | Regeneration method of deactivated catalyst | |
| CN106732655A (en) | A kind of arsenic poisoning SCR denitration renovation process | |
| CN102389838A (en) | Device for on-line cleaning of selective catalyctic reduction (SCR) denitration catalyst and cleaning process thereof | |
| CN114870907B (en) | Regeneration method of denitration catalyst for alkali/alkaline earth metal poisoning | |
| JP2019010635A (en) | Regeneration method of denitration catalyst and regeneration system of denitration catalyst | |
| CN105435864A (en) | In-situ regeneration device and method for glass kiln SCR denitration catalyst | |
| CN104209148A (en) | Alkali washing regenerating liquid for denitration catalyst and regenerating method | |
| CN104437673B (en) | A kind of method removing inactivation SCR denitration catalyst Surface Fe compound | |
| CN105170198A (en) | Industrialized regeneration method of SCR plate-type denitration catalyst | |
| CN106215981A (en) | A kind of ultrasonic pickling renovation process of waste flue gas denitration catalyst | |
| CN114308140A (en) | Catalyst regeneration method based on ammonium bisulfate poisoning | |
| CN113600248A (en) | Thallium-poisoned denitration catalyst regeneration method | |
| CN117065806A (en) | Regeneration cleaning agent and regeneration method for arsenic poisoning denitration catalyst | |
| CN114471745A (en) | Regeneration method of SCR denitration catalyst and application of SCR denitration catalyst in denitration | |
| CN106179529B (en) | One kind is for the regenerated cleaning solution of denitrating catalyst and its preparation method and application that fails | |
| CN105728064A (en) | Method for cleaning and regenerating SCR denitration catalyst for potassium and sodium poisoning deactivation | |
| CN113477083B (en) | Regeneration method of inactivated denitration dedusting ceramic tube | |
| CN118371275B (en) | Method for regenerating post-treatment catalyst in failure mode | |
| CN109126904A (en) | A kind of regeneration washing liquid and its cleaning method for high-efficiency washing denitrating catalyst | |
| JP4578706B2 (en) | How to remove acidic deposits |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |