CN110124754B - Regeneration method of arsenic poisoning inactivated denitration catalyst - Google Patents
Regeneration method of arsenic poisoning inactivated denitration catalyst Download PDFInfo
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- CN110124754B CN110124754B CN201810136806.1A CN201810136806A CN110124754B CN 110124754 B CN110124754 B CN 110124754B CN 201810136806 A CN201810136806 A CN 201810136806A CN 110124754 B CN110124754 B CN 110124754B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 199
- 238000011069 regeneration method Methods 0.000 title claims abstract description 32
- 208000008316 Arsenic Poisoning Diseases 0.000 title abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 143
- 238000010521 absorption reaction Methods 0.000 claims abstract description 57
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000001035 drying Methods 0.000 claims abstract description 33
- 239000002912 waste gas Substances 0.000 claims abstract description 28
- 239000000243 solution Substances 0.000 claims description 86
- 229910052751 metal Inorganic materials 0.000 claims description 69
- 239000002184 metal Substances 0.000 claims description 69
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 50
- 239000002245 particle Substances 0.000 claims description 50
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 38
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 32
- 229910052725 zinc Inorganic materials 0.000 claims description 32
- 239000011701 zinc Substances 0.000 claims description 32
- 238000002791 soaking Methods 0.000 claims description 22
- 239000002253 acid Substances 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 11
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 claims description 10
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims description 10
- 230000001172 regenerating effect Effects 0.000 claims description 10
- 239000001119 stannous chloride Substances 0.000 claims description 10
- 235000011150 stannous chloride Nutrition 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 229910001868 water Inorganic materials 0.000 claims description 9
- 150000003839 salts Chemical class 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 6
- 235000010288 sodium nitrite Nutrition 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 239000012670 alkaline solution Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 235000007686 potassium Nutrition 0.000 claims description 2
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims 1
- 239000002585 base Substances 0.000 claims 1
- 238000010926 purge Methods 0.000 claims 1
- 230000008929 regeneration Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 7
- 239000004480 active ingredient Substances 0.000 abstract description 5
- -1 arsenic ions Chemical class 0.000 abstract description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 description 93
- 150000001495 arsenic compounds Chemical class 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 238000007664 blowing Methods 0.000 description 10
- 238000005406 washing Methods 0.000 description 10
- 239000000178 monomer Substances 0.000 description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 229940093920 gynecological arsenic compound Drugs 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910052720 vanadium Inorganic materials 0.000 description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 238000009616 inductively coupled plasma Methods 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 2
- 241000219793 Trifolium Species 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 231100000631 Secondary poisoning Toxicity 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 229910000413 arsenic oxide Inorganic materials 0.000 description 1
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- WKXHZKXPFJNBIY-UHFFFAOYSA-N titanium tungsten vanadium Chemical compound [Ti][W][V] WKXHZKXPFJNBIY-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
- B01D53/14—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 absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- 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
-
- 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
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
-
- 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
-
- 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
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- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
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- Catalysts (AREA)
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Abstract
The invention relates to the field of denitration catalyst regeneration, and discloses a regeneration method of an arsenic poisoning deactivated denitration catalyst, which comprises the following steps: (1) carrying out reduction cleaning on the deactivated denitration catalyst after physical ash removal, and introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (2) further carrying out deep reduction cleaning on the denitration catalyst after reduction cleaning, and continuously introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (3) and drying the deeply reduced denitration catalyst to prepare the regenerated denitration catalyst. The method not only recovers the denitration activity of the inactivated denitration catalyst, but also avoids the pollution of the cleaning solution caused by introducing a large amount of arsenic ions into the cleaning solution, reduces the difficulty of wastewater treatment, and simultaneously avoids the loss of a large amount of active ingredients in the catalyst.
Description
Technical Field
The invention relates to the field of regeneration of deactivated denitration catalysts, in particular to a regeneration method of an arsenic-poisoned deactivated denitration catalyst.
Background
The nitrogen oxides discharged from the flue gas of coal-fired power plants are important sources of nitrogen oxides in the atmosphere. At present, the international universal vanadium-tungsten-titanium SCR denitration catalyst is generally adopted to remove nitrogen oxides from the discharged flue gas. The service life of the SCR denitration catalyst is averagely not more than three years, and the replaced deactivated catalyst is more than 20 ten thousand meters per year3. And because the partially deactivated catalyst contains high-concentration compounds such as arsenic, mercury, beryllium and the like, the deactivated catalyst is defined as dangerous waste and cannot be discarded randomly, and the catalyst needs to be treated to remove dangerous chemical substances contained in the catalyst for secondary use. Particularly for the catalyst of a power plant in the northeast China area, because the arsenic content in the coal fired in the area is high, gaseous arsenic compounds formed after arsenic is combusted at high temperature in a boiler can pass through a catalyst pore passage along with flue gas and are adsorbed and deposited on the catalyst, so that the catalyst is poisoned and inactivated due to the deposition of high-concentration arsenic oxides.
At present, the arsenic removal technology of the existing inactivated denitration catalyst needs a large amount of acidic or alkaline cleaning solution for removing arsenic, arsenic compounds are introduced into the cleaning solution and need secondary water treatment, or high-concentration dangerous gas is needed in the technical process, so that the existing technology has great potential safety hazard, has strict requirements on equipment and production conditions, and is unreasonable in economy.
For example, CN104857998A of the prior art discloses a regeneration method for an As-poisoned denitration catalyst, which uses 1-4 wt% of calcium nitrate or saturated limestone with pH of 7-11 As an arsenic removal reagent, and combines with dilute sulfuric acid to wash the introduced calcium ions, so As to obtain a regenerated denitration catalyst with high denitration activity and low loss of active components. Although the method realizes low loss of active ingredients in the regeneration process, a large amount of arsenic-containing ions are introduced into each cleaning procedure in the cleaning process to cause water pollution, and the process is easy to cause a certain amount of CaSO to be deposited in the catalyst4Causing secondary poisoning of the catalyst.
CN103894240A discloses a regeneration method of an arsenic poisoning selective catalytic reduction denitration catalyst, which comprises soaking in a regeneration solution composed of acid, strong oxidant, surfactant, ammonium metavanadate, ammonium molybdate and deionized water, then soaking in flowing deionized water for rinsing, drying and roasting to obtain the regenerated denitration catalyst. After the method is used for once impregnation, the active impregnation liquid of the catalyst is polluted by arsenic ions and cannot be used for multiple times, so that the waste of the active impregnation liquid is caused, more cleaning procedures and funds are required for removing arsenic components in the active catalyst, and the method is not economically feasible.
CN105536886A discloses a regeneration method of an arsenic-poisoned denitration catalyst, which is introduced with 60-99 percent of CO and H under the conditions of 100 ℃ and 350 DEG C2The synthesis gas carries out reduction reaction on the deactivated catalyst, then the synthesis gas is continuously introduced, and SO is introduced under the conditions of 350-550 DEG C2Or HCl acid gas is subjected to reduction-acidification reaction. The method uses high-concentration dangerous gas, so that not only is a great potential safety hazard existed, but also the requirements for equipment and production conditions are extremely high, and in addition, the economic cost and the safety cost for catalyst regeneration are relatively overhigh.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, arsenic ions are introduced into each cleaning procedure to cause water body pollution, or high-concentration dangerous gas is used in the process to cause great potential safety hazard, the requirements on equipment and production conditions are strict, the economy is unreasonable and the like, and provides a regeneration method of an arsenic poisoning inactivation denitration catalyst.
In order to achieve the above object, the present invention provides a method for regenerating an arsenic-poisoned deactivated denitration catalyst, comprising the steps of: (1) carrying out reduction cleaning on the deactivated denitration catalyst after physical ash removal, and introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (2) further carrying out deep reduction cleaning on the denitration catalyst after reduction cleaning, and continuously introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (3) and drying the deeply reduced denitration catalyst to prepare the regenerated denitration catalyst.
Through the technical scheme, the denitration activity of the inactivated denitration catalyst is recovered, more importantly, the cleaning liquid is prevented from being polluted by a large amount of arsenic ions introduced into the cleaning liquid, the wastewater treatment difficulty is reduced, and meanwhile, the loss of a large amount of active ingredients in the catalyst is also avoided.
Drawings
FIG. 1 is a process flow diagram of the regeneration process of the present invention.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a regeneration method of an arsenic poisoning inactivation denitration catalyst, which comprises the following steps: (1) carrying out reduction cleaning on the deactivated denitration catalyst after physical ash removal, and introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (2) further carrying out deep reduction cleaning on the denitration catalyst after reduction cleaning, and continuously introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (3) and drying the deeply reduced denitration catalyst to prepare the regenerated denitration catalyst.
Aiming at a denitration catalyst which is deactivated by deposition with high arsenic content, the catalyst after physical ash removal is firstly subjected to negative pressure reduction cleaning to enable trivalent arsenic compounds on the surface of the catalyst to react to generate gaseous arsenic compounds, and the gaseous arsenic compounds are introduced into an alkaline absorption tank to be absorbed through negative pressure; and then deeply reducing and cleaning the preliminarily cleaned catalyst to reduce pentavalent arsenic in the catalyst into trivalent arsenic and further remove the reduced trivalent arsenic, and enabling the generated gaseous arsenic compound to enter an alkaline cleaning pool for absorption through negative pressure.
According to the invention, in the step (1), the reduction cleaning mode is soaking, bubble or ultrasonic cleaning, the reduction cleaning temperature is 20-80 ℃, the reduction cleaning time is 1-30min, and the denitration activity of the inactivated denitration catalyst can be effectively recovered.
According to the present invention, the amount of air bubbles is 0.1 to 1m in order to further restore the denitration activity of the deactivated denitration catalyst3The ultrasonic frequency is 20-120 KHZ.
According to the invention, in order to react the trivalent arsenic compound on the surface of the catalyst to generate the gaseous arsenic compound, the cleaning liquid of the reduction cleaning pool is prepared by contacting dilute acid, a reducing metal simple substance and deionized water.
Preferably, in the step (1), the deactivated denitration catalyst after physical ash removal is immersed in a dilute acid solution in a negative pressure reduction cleaning tank, and then reducing metal simple substance particles are added for reduction cleaning.
According to the invention, in order to further react the trivalent arsenic compound on the surface of the catalyst to generate the gaseous arsenic compound, the concentration of the dilute acid is 0.05-0.5mol/L, and the concentration of the reducing metal simple substance is 0.5-5%.
According to the invention, in order to better enable the trivalent arsenic compound on the surface of the catalyst to react to generate the gaseous arsenic compound, the dilute acid is sulfuric acid, and the reducing metal simple substance is one of metal lithium, metal sodium, metal aluminum, metal zinc and metal iron.
Preferably, the particle shape of the simple reducing metal is honeycomb shape, spherical shape or clover shape, and the particle size is 5-50 particles/g.
According to the invention, in the step (1), the alkaline absorption liquid in the alkaline absorption pool is dissolved in water by strong base to prepare the alkaline solution with the pH value of more than 12, so that the waste gas can be effectively removed, the arsenic compound is prevented from being introduced into the cleaning liquid, and the pollution to the water body in the cleaning process and the pressure of later-stage water treatment are reduced.
According to the invention, in order to further remove the waste gas, avoid introducing arsenic compounds into the cleaning solution and reduce the pollution to the water body in the cleaning process and the pressure of the later-stage water treatment, the strong base is one of sodium hydroxide, potassium hydroxide, ammonium carbonate and potassium carbonate.
According to the invention, in order to thoroughly remove the residual silicon oxide, calcium sulfate, organic residual impurities and the like on the surface and in the pore canal, in the step (1), the physical ash removal is to carry out physical ash removal on the denitration catalyst through negative pressure dust collection and positive pressure blowing.
According to the invention, in order to reduce pentavalent arsenic in the catalyst into trivalent arsenic and further remove the reduced trivalent arsenic, in the step (2), the cleaning liquid of the deep reduction cleaning pool is prepared by contacting dilute acid, reducing metal salt, reducing metal simple substance and deionized water.
Preferably, in the step (2), the denitration catalyst cleaned by the reduction cleaning tank enters the deep reduction cleaning tank, and is firstly immersed in a solution containing dilute acid and reducing metal salt, and then the reducing metal simple substance particles are added for further reduction cleaning.
According to the invention, in order to further reduce pentavalent arsenic in the catalyst into trivalent arsenic and further remove the reduced trivalent arsenic, the concentration of the dilute acid is 0.05-0.5mol/L, the concentration of the reducing metal simple substance is 0.5-5%, and the concentration of the reducing metal salt is 0.5-5%.
According to the invention, in order to better reduce pentavalent arsenic in the catalyst into trivalent arsenic and further remove the reduced trivalent arsenic, the dilute acid is sulfuric acid, the reducing metal simple substance is one of metal lithium, metal sodium, metal aluminum, metal zinc and metal iron, and the reducing metal salt is one of sodium nitrite, stannous chloride and potassium borohydride;
preferably, the particle shape of the simple reducing metal is honeycomb shape, spherical shape or clover shape, and the particle size is 5-50 particles/g.
According to the invention, in order to further prevent the loss of the active ingredients, in the step (3), the drying temperature is 80-120 ℃, and the drying time is 1-5 h.
In conclusion, the method not only recovers the denitration activity of the inactivated denitration catalyst, but also avoids the pollution of the cleaning solution caused by introducing a large amount of arsenic ions into the cleaning solution, reduces the difficulty of wastewater treatment, and simultaneously avoids the loss of a large amount of active ingredients in the catalyst.
The present invention will be described in detail below by way of examples. In the following examples:
and (3) testing the concentration of arsenic and vanadium in the catalyst cleaning solution: and (3) taking the catalyst cleaning solution, carrying out inductively coupled plasma mass spectrometer element analysis (ICP), and testing the concentrations of total arsenic and total vanadium in the cleaning solution.
And (3) testing the performance of the catalyst: an experimental platform is set up, the regenerated denitration catalyst prepared in the examples 1-9 and the comparative examples 1-6 is put into a stainless steel fixed bed reactor, the temperature is raised to 360 ℃, and simulated flue gas (SO) is introduced2＝500ppm，NOx＝NH3＝300ppm，O2＝3％，H2O＝10％，N2For balance gas), air8000h-1The concentration of NOx at the inlet and outlet of the catalyst was tested by a Thermal42i flue gas analyzer in the United states.
Conversion of NO:
in the formula:
NOx concentration at the reactor inlet in ppm;
is the reactor outlet NOx concentration in ppm.
In the case where no particular mention is made, commercially available products are used as the starting materials.
Example 1
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning tank for reduction cleaning, wherein the reduction cleaning solution is a 5% sulfuric acid solution, soaking the catalyst for 15min, and adding 20 particles/g of spherical metal zinc particles into the reduction cleaning tank, wherein the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the reduction waste gas into an alkaline absorption tank containing 10% of sodium hydroxide for absorption in a negative pressure induced air mode;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 5% of stannous chloride and 3% of sulfuric acid, after the catalyst is immersed for 10min, adding 20 particles/g of spherical metal zinc particles into the solution, and the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Example 2
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning pool for reduction cleaning, wherein the reduction cleaning solution is 2% sulfuric acid solution, soaking the catalyst for 10min, and adding 20 particles/g of spherical metal zinc particles into the cleaning pool, wherein the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the reduction waste gas into an alkaline absorption tank containing 10% of sodium hydroxide for absorption in a negative pressure induced air mode;
(3) immersing the catalyst after reduction cleaning in a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 2% of sodium nitrite and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 20 particles/g of spherical metal zinc particles into the solution, and the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to prepare the regenerated denitration catalyst.
Example 3
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning pool for reduction cleaning, wherein the reduction cleaning solution is a 3% sulfuric acid solution, soaking the catalyst for 20min, and adding 20 particles/g of spherical metallic iron particles into the cleaning pool, wherein the mass ratio of the metallic iron to the solution is 1: 50, reacting for 10min, and introducing the reduction waste gas into an alkaline absorption tank containing 10% of sodium hydroxide for absorption in a negative pressure induced air mode;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 2% of stannous chloride and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 20 particles/g of spherical metallic iron particles into the solution, and the mass ratio of the metallic iron to the solution is 1: 50, reacting for 10min, and introducing the deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Example 4
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning pool for reduction cleaning, wherein the reduction cleaning solution is a 3% sulfuric acid solution, soaking the catalyst for 12min, and adding 20 spherical sodium metal particles per gram into the cleaning pool, wherein the mass ratio of the sodium metal to the solution is 1: 50, reacting for 10min, and introducing the reduction waste gas into an alkaline absorption tank containing 10% of sodium hydroxide for absorption in a negative pressure induced air mode;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 2% of stannous chloride and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 20 particles/g of spherical metal sodium particles into the solution, and the mass ratio of the metal sodium to the solution is 1: 50, reacting for 10min, and introducing the deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Example 5
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning tank for reduction cleaning, wherein the reduction cleaning solution is a 5% sulfuric acid solution, soaking the catalyst for 10min, and adding 20 particles/g of honeycomb-shaped metal zinc particles into the cleaning tank, wherein the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the reduction waste gas into an alkaline absorption tank containing 10% of sodium hydroxide for absorption in a negative pressure induced air mode;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 2% of stannous chloride and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 20 particles/g of honeycomb-shaped metal zinc particles into the solution, and the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Example 6
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning tank for reduction cleaning, wherein the reduction cleaning solution is a 5% sulfuric acid solution, soaking the catalyst for 20min, and adding 20 particles/g of honeycomb-shaped metal zinc particles into the cleaning tank, wherein the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the reduction waste gas into an alkaline absorption tank containing 10% of sodium hydroxide for absorption in a negative pressure induced air mode;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 3% of stannous chloride and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 50 particles/g of honeycomb-shaped metal zinc particles into the solution, and the mass ratio of the metal zinc to the solution is 1: 50, reacting for 10min, and introducing the deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Example 7
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning tank for reduction cleaning, wherein the reduction cleaning solution is 1% sulfuric acid solution, soaking the catalyst for 18min, and adding 20 particles/g of honeycomb-shaped metal zinc particles into the cleaning tank, wherein the mass ratio of the metal zinc to the solution is 1: air bubble is injected at a speed of 50, 0.1m3/min for 10min, and reduction waste gas is introduced into an alkaline absorption pool containing 10% of sodium hydroxide in a negative pressure induced air mode for absorption;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 2% of stannous chloride and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 50 particles/g of honeycomb-shaped metal zinc particles into the solution, and the mass ratio of the metal zinc to the solution is 1: air bubble is injected at a speed of 50, 0.1m3/min for 10min, and deep reduction waste gas is introduced into an alkaline absorption tank to be absorbed in a negative pressure induced air mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Example 8
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning tank for reduction cleaning, wherein the reduction cleaning solution is a 5% sulfuric acid solution, soaking the catalyst for 10min, and adding 20 particles/g of honeycomb-shaped metal zinc particles into the cleaning tank, wherein the mass ratio of the metal zinc to the solution is 1: reacting at 50 ℃ for 10min at 50 ℃, and introducing the reduction waste gas into an alkaline absorption pool containing 10% of sodium hydroxide for absorption in a negative pressure induced air mode;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 0.5% of stannous chloride and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 50 particles/g of honeycomb-shaped metal zinc particles into the solution, and the mass ratio of the metal zinc to the solution is 1: reacting at 50 ℃ for 10min at 50 ℃, and introducing the deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft mode;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Example 9
The regeneration method of the arsenic-poisoned deactivated denitration catalyst, as shown in fig. 1, comprises the following steps:
(1) taking a certain power plant to operate for 24000h, carrying out physical ash removal on the catalyst by negative pressure dust collection and positive pressure blowing, wherein the size of an arsenic poisoning deactivated plate type denitration catalyst monomer is 464 multiplied by 0.8 multiplied by 440 mm;
(2) soaking a catalyst into a reduction cleaning tank for reduction cleaning, wherein the reduction cleaning solution is a 4% sulfuric acid solution, soaking the catalyst for 10min, and adding 30 particles/g of honeycomb-shaped metal zinc particles into the cleaning tank, wherein the mass ratio of the metal zinc to the solution is 1: 50, carrying out ultrasonic reaction for 5min, and introducing the reduced waste gas into an alkaline absorption tank containing 10% of sodium hydroxide for absorption in a negative pressure induced draft mode;
(3) immersing the catalyst after reduction cleaning into a deep reduction cleaning pool for deep reduction cleaning, wherein the deep reduction cleaning solution is a solution containing 1% of stannous chloride and 1% of sulfuric acid, after the catalyst is immersed for 10min, adding 40 particles/g of honeycomb-shaped metal zinc particles into the solution, and the mass ratio of the metal zinc to the solution is 1: performing ultrasonic treatment for 10min at 100 deg.C, and introducing deeply reduced waste gas into an alkaline absorption tank for absorption in a negative pressure induced draft manner;
(4) and (3) drying the deeply cleaned catalyst in a drying oven at 120 ℃ for 3h to obtain the regenerated denitration catalyst.
Comparative example 1
The regeneration of the arsenic-poisoned deactivated denitration catalyst was carried out in the same manner as in example 1, except that the catalyst was immersed in deionized water and washed at 0.1m3The air bubble speed is 10min, and the cleaned catalyst is dried for 3h at 120 ℃ in a drying oven, so that the regenerated denitration catalyst is prepared.
Comparative example 2
The regeneration of the deactivated denitration catalyst poisoned with arsenic was performed according to the method of example 1, except that the catalyst was immersed in deionized water for washing, ultrasonic washing was performed at a frequency of 40KHZ for 5min, and the washed catalyst was dried in a drying oven at 120 ℃ for 3h to obtain a regenerated denitration catalyst.
Comparative example 3
Regeneration of the deactivated denitration catalyst poisoned with arsenic was carried out by the method of example 1, except that the catalyst was immersed in a 5% sulfuric acid solution for washing, ultrasonic washing was carried out at a frequency of 60KHZ for 5min, and the washed catalyst was dried in a drying oven at 120 ℃ for 3h to obtain a regenerated denitration catalyst.
Comparative example 4
The regeneration of the deactivated denitration catalyst poisoned with arsenic was performed according to the method of example 1, except that the catalyst was immersed in a 5% sulfuric acid solution at 40 ℃ for washing, ultrasonic washing was performed at a frequency of 60KHZ for 5min, and the washed catalyst was dried in a drying oven at 120 ℃ for 3h to obtain a regenerated denitration catalyst.
Comparative example 5
The regeneration of the deactivated denitration catalyst poisoned with arsenic was performed according to the method of example 1, except that the catalyst was immersed in 1% sodium hydroxide solution for washing, ultrasonic washing was performed at a frequency of 40KHZ for 15min, and the washed catalyst was dried in a drying oven at 120 ℃ for 3h to prepare a regenerated denitration catalyst.
Comparative example 6
Regeneration of the deactivated denitration catalyst poisoned with arsenic was carried out in the same manner as in example 1, except that the catalyst was immersed in 1% sodium hydroxide solution at 50 ℃ for washing, ultrasonic washing was carried out at a frequency of 23KHZ for 15min, and the washed catalyst was dried in a drying oven at 120 ℃ for 3 hours to obtain a regenerated denitration catalyst.
Test example
Examples 1-9 are defined as test examples 1-9, comparative examples 1-6 as test examples 10-15, and the arsenic poisoned deactivated catalyst was taken as test example 16.
The reducing cleaning solutions of the test examples 1 to 9 were mixed with the deep reducing cleaning solution in an equal volume to one another, and subjected to ICP composition analysis of arsenic and vanadium; ICP component analysis of arsenic and vanadium was directly performed on the cleaning solutions of test examples 10 to 15; taking test examples 1-16, testing the NO conversion rate of the catalyst according to the catalyst performance test conditions, wherein the arsenic and vanadium content and the NO conversion rate of the catalyst in each test example are shown in Table 1:
TABLE 1
The results in table 1 show that, in examples 1 to 9 of the present invention, the regeneration method combining reduction cleaning and deep reduction cleaning is adopted, so that the arsenic content in the cleaning solution is greatly reduced, the loss of vanadium in the catalyst is reduced, and the activity of the regenerated catalyst is further improved.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A regeneration method of an arsenic-poisoned deactivated denitration catalyst is characterized by comprising the following steps: (1) carrying out reduction cleaning on the deactivated denitration catalyst after physical ash removal, and introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (2) further carrying out deep reduction cleaning on the denitration catalyst after reduction cleaning, and continuously introducing waste gas generated in the cleaning process into an alkaline absorption tank through negative pressure for absorption; (3) drying the deeply reduced denitration catalyst to prepare a regenerated denitration catalyst;
in the step (1), the reduction cleaning is to immerse the deactivated denitration catalyst subjected to physical ash removal into a dilute acid solution in a negative pressure reduction cleaning tank, and then add reducing metal simple substance particles to perform reduction cleaning.
2. The method for regenerating an arsenic-poisoned deactivated denitration catalyst as recited in claim 1, wherein in the step (1), the reduction cleaning is performed by soaking, bubble or ultrasonic cleaning, the reduction cleaning temperature is 20 to 80 ℃, and the reduction cleaning time is 1 to 30 min.
3. The method for regenerating a deactivated denitration catalyst poisoned with arsenic as claimed in claim 2, wherein the amount of air bubbles is 0.1 to 1m3The ultrasonic frequency is 20-120 kHz.
4. The method for regenerating a deactivated denitration catalyst poisoned with arsenic as claimed in claim 1, wherein the concentration of the dilute acid is 0.05-0.5mol/L, and the concentration of the reducing metal simple substance is 0.5-5%;
and/or the dilute acid is sulfuric acid, and the reducing metal simple substance is metal zinc;
and/or the particle shape of the simple reducing metal is spherical or clover-shaped, and the particle size is 5-50 particles/g.
5. The method for regenerating a deactivated denitration catalyst poisoned with arsenic as claimed in claim 1, wherein in the step (1), the alkaline absorption liquid of the alkaline absorption tank is dissolved in water by strong alkali to obtain alkaline solution with pH > 12.
6. The method of regenerating a deactivated denitration catalyst poisoned with arsenic as claimed in claim 5, wherein the strong base is one of sodium hydroxide and potassium hydroxide.
7. The method for regenerating an arsenic-poisoned deactivated denitration catalyst as claimed in claim 1, wherein in the step (1), the physical ash removal is performed by performing physical ash removal on the denitration catalyst through negative pressure dust collection and positive pressure purging.
8. The method for regenerating an arsenic-poisoned deactivated denitration catalyst as claimed in claim 1, wherein in the step (2), the cleaning solution of the deep reduction cleaning tank is prepared by contacting dilute acid, reducing metal salt, reducing metal simple substance and deionized water;
and/or in the step (2), the denitration catalyst cleaned by the reduction cleaning tank enters a deep reduction cleaning tank, is firstly immersed in a solution containing dilute acid and reducing metal salt, and then is added with reducing metal simple substance particles for further reduction cleaning.
9. The method for regenerating an arsenic-poisoned deactivated denitration catalyst according to claim 8, wherein the dilute acid concentration is 0.05-0.5mol/L, the concentration of the reducing metal simple substance is 0.5-5%, and the concentration of the reducing metal salt is 0.5-5%;
and/or the dilute acid is sulfuric acid, the reducing metal simple substance is metal zinc, and the reducing metal salt is one of sodium nitrite, stannous chloride and potassium borohydride;
and/or the particle shape of the simple reducing metal is spherical or clover-shaped, and the particle size is 5-50 particles/g.
10. The method for regenerating a deactivated denitration catalyst poisoned with arsenic as claimed in claim 1, wherein in the step (3), the drying temperature is 80-120 ℃ and the drying time is 1-5 hours.
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| CN106861772A (en) * | 2017-02-13 | 2017-06-20 | 武汉大学 | A kind of negative pressure combination ultrasonic wave carries out regeneration method to inactivation SCR denitration catalyst |
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| CN106861772A (en) * | 2017-02-13 | 2017-06-20 | 武汉大学 | A kind of negative pressure combination ultrasonic wave carries out regeneration method to inactivation SCR denitration catalyst |
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