WO2017010402A1 - 脱硝触媒の再生方法及び脱硝触媒の再生システム、並びに脱硝触媒の洗浄剤 - Google Patents
脱硝触媒の再生方法及び脱硝触媒の再生システム、並びに脱硝触媒の洗浄剤 Download PDFInfo
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- WO2017010402A1 WO2017010402A1 PCT/JP2016/070162 JP2016070162W WO2017010402A1 WO 2017010402 A1 WO2017010402 A1 WO 2017010402A1 JP 2016070162 W JP2016070162 W JP 2016070162W WO 2017010402 A1 WO2017010402 A1 WO 2017010402A1
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- Prior art keywords
- denitration catalyst
- chemical solution
- catalyst
- surfactant
- water
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- 239000003054 catalyst Substances 0.000 title claims abstract description 409
- 238000011069 regeneration method Methods 0.000 title claims abstract description 126
- 230000008929 regeneration Effects 0.000 title claims abstract description 91
- 239000012459 cleaning agent Substances 0.000 title claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 206
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 115
- 238000004140 cleaning Methods 0.000 claims abstract description 79
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 60
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 48
- 150000002222 fluorine compounds Chemical class 0.000 claims abstract description 41
- 239000000243 solution Substances 0.000 claims description 156
- 238000005406 washing Methods 0.000 claims description 143
- 239000004094 surface-active agent Substances 0.000 claims description 82
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 70
- -1 polyoxyethylene Polymers 0.000 claims description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 31
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 229910019142 PO4 Inorganic materials 0.000 claims description 21
- 239000004327 boric acid Substances 0.000 claims description 21
- 239000002736 nonionic surfactant Substances 0.000 claims description 21
- 239000010452 phosphate Substances 0.000 claims description 21
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
- 239000003945 anionic surfactant Substances 0.000 claims description 15
- 239000000377 silicon dioxide Substances 0.000 claims description 15
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 14
- 230000001172 regenerating effect Effects 0.000 claims description 12
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 9
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 claims description 9
- 150000002334 glycols Chemical class 0.000 claims description 7
- 229920001515 polyalkylene glycol Polymers 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 239000003599 detergent Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 83
- 238000011084 recovery Methods 0.000 description 44
- 238000005259 measurement Methods 0.000 description 33
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 30
- 239000011575 calcium Substances 0.000 description 30
- 229910052791 calcium Inorganic materials 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 27
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 24
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 22
- LDDQLRUQCUTJBB-UHFFFAOYSA-O azanium;hydrofluoride Chemical compound [NH4+].F LDDQLRUQCUTJBB-UHFFFAOYSA-O 0.000 description 20
- XWIHRGFIPXWGEF-UHFFFAOYSA-N propafenone hydrochloride Chemical compound Cl.CCCNCC(O)COC1=CC=CC=C1C(=O)CCC1=CC=CC=C1 XWIHRGFIPXWGEF-UHFFFAOYSA-N 0.000 description 16
- 238000001035 drying Methods 0.000 description 15
- 239000002699 waste material Substances 0.000 description 14
- 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 description 10
- 238000012545 processing Methods 0.000 description 10
- 239000008155 medical solution Substances 0.000 description 8
- 150000003014 phosphoric acid esters Chemical class 0.000 description 7
- 230000032258 transport Effects 0.000 description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 150000007524 organic acids Chemical class 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- NFZZDOYBSGWASD-UHFFFAOYSA-N 4-amino-n-pyrimidin-2-ylbenzenesulfonamide;5-[(3,4,5-trimethoxyphenyl)methyl]pyrimidine-2,4-diamine Chemical compound C1=CC(N)=CC=C1S(=O)(=O)NC1=NC=CC=N1.COC1=C(OC)C(OC)=CC(CC=2C(=NC(N)=NC=2)N)=C1 NFZZDOYBSGWASD-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002169 ethanolamines Chemical class 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- DECIPOUIJURFOJ-UHFFFAOYSA-N ethoxyquin Chemical compound N1C(C)(C)C=C(C)C2=CC(OCC)=CC=C21 DECIPOUIJURFOJ-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 229940126062 Compound A Drugs 0.000 description 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 description 1
- 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 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910017855 NH 4 F Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- FDDDEECHVMSUSB-UHFFFAOYSA-N sulfanilamide Chemical compound NC1=CC=C(S(N)(=O)=O)C=C1 FDDDEECHVMSUSB-UHFFFAOYSA-N 0.000 description 1
- 229940124530 sulfonamide Drugs 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 description 1
- UUUGYDOQQLOJQA-UHFFFAOYSA-L vanadyl sulfate Chemical compound [V+2]=O.[O-]S([O-])(=O)=O UUUGYDOQQLOJQA-UHFFFAOYSA-L 0.000 description 1
- 229940041260 vanadyl sulfate Drugs 0.000 description 1
- 229910000352 vanadyl sulfate Inorganic materials 0.000 description 1
- 239000003981 vehicle Substances 0.000 description 1
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- 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
- 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
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- 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
- B01D53/8696—Controlling the catalytic process
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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- C—CHEMISTRY; METALLURGY
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- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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- C11D2111/10—
Definitions
- the present invention relates to a denitration catalyst regeneration method, a denitration catalyst regeneration system, and a denitration catalyst cleaning agent, and more particularly, to a regeneration method and regeneration system for a deteriorated denitration catalyst for a coal-fired boiler, and a cleaning agent.
- Equipment for burning fuels such as fossil fuels and biomass is equipped with denitration equipment for removing nitrogen oxides contained in exhaust gas generated by burning the fuel.
- Some denitration facilities include a denitration catalyst that promotes removal of nitrogen oxides. The performance of the denitration catalyst deteriorates when used. For this reason, in the denitration facility, the denitration catalyst is replaced or added during maintenance. In order to reuse the denitration catalyst, it has also been proposed to perform regeneration to restore performance.
- Japanese Patent No. 4870217 in a method for improving catalytic activity in a flue gas denitration apparatus used for boiler exhaust gas, a denitration catalyst whose activity has been reduced by a silica-alumina-calcium sulfate-based poisonous substance is previously washed with water, A method for improving the catalytic activity in a flue gas denitration apparatus is described in which a mixed solution of an organic acid and a fluoride is used to wash and remove the substance at room temperature after it has been hydrated.
- the concentration of hydrofluoric acid in the cleaning liquid is set to 0.3 to 3% by mass, and the temperature of the cleaning liquid is set to 40 to It is described that the catalyst is washed at 80 ° C.
- the catalyst performance can be recovered to a high level by using an organic acid and a fluorine compound such as fluoride for cleaning the denitration catalyst.
- catalyst regeneration components such as calcium may adhere to the catalyst surface due to the regeneration treatment. If calcium, which is a catalyst deterioration component, adheres, the catalyst performance after regeneration may be insufficient. Further, there is a problem that the crushing strength of the denitration catalyst is reduced by the regeneration treatment.
- the present invention solves the above-described problems, and can remove deposits attached to the surface of the catalyst efficiently, can recover catalyst performance at a high level, and can suppress a decrease in crushing strength. It is an object of the present invention to provide a catalyst regeneration method, a denitration catalyst regeneration system, and a denitration catalyst cleaning agent.
- a method for regenerating a denitration catalyst includes a prewashing step of washing the denitration catalyst with water, and the denitration catalyst washed with water into a chemical solution containing an inorganic acid and a fluorine compound. It includes at least a chemical solution washing step for immersing, a step for removing the denitration catalyst from the chemical solution, and a final washing step for washing the denitration catalyst taken out from the chemical solution with water or sulfamic acid-containing water as a final washing solution.
- the chemical solution further includes a surfactant.
- the surfactant is more preferably a nonionic surfactant or an anionic surfactant. With this surfactant, calcium dissolved in the cleaning liquid and calcium in the dust can be highly dispersed, and there is an effect of suppressing reattachment to the catalyst.
- the inorganic acid preferably contains hydrochloric acid.
- hydrochloric acid it is desirable to contain a boric acid in hydrochloric acid as needed.
- the inorganic acid preferably contains sulfamic acid.
- the nonionic surfactant is a surfactant mainly composed of polyoxyethylene polyoxypropylene glycol, polyoxyethylene derivative or polyalkylene glycol derivative. Preferably there is.
- the anionic surfactant is preferably a surfactant mainly composed of a polyoxyalkylene alkyl ether phosphate.
- the silica concentration on the catalyst surface is 6 mass% or less by immersing the denitration catalyst in the chemical solution.
- the denitration catalyst is immersed in water in a water tank, the water tank is sealed, and air in the water tank is sucked.
- the chemical solution is repeatedly used in the chemical solution washing step.
- a denitration catalyst regeneration system includes a prewash unit for washing the denitration catalyst with water, and a chemical solution containing the washed denitration catalyst with an inorganic acid and a fluorine compound. And a finishing washing section for finishing washing the denitration catalyst taken out from the chemical solution with water or sulfamic acid-containing water as a finishing washing solution.
- deposits attached to the surface of the catalyst can be efficiently removed, the catalyst performance is highly recovered, and the crushing strength is reduced. Can be suppressed.
- a cleaning liquid according to another aspect of the present invention is a cleaning liquid for cleaning a deteriorated denitration catalyst for a coal fired boiler, and an aqueous solution containing an inorganic acid and a fluorine compound. At least.
- the cleaning liquid preferably further contains a surfactant, and the surfactant is preferably a nonionic surfactant or an anionic surfactant.
- the inorganic acid preferably contains hydrochloric acid.
- hydrochloric acid it is desirable to contain a boric acid as a rust preventive in hydrochloric acid as needed.
- the inorganic acid preferably contains sulfamic acid.
- the nonionic surfactant is a surfactant mainly composed of polyoxyethylene polyoxypropylene glycol, polyoxyethylene derivative or polyalkylene glycol derivative. Preferably there is.
- the anionic surfactant is preferably a surfactant mainly composed of a polyoxyalkylene alkyl ether phosphate.
- FIG. 1 is a schematic diagram showing a schematic configuration of a denitration catalyst regeneration system of the first embodiment.
- FIG. 2 is a flowchart showing an example of the regeneration method of the denitration catalyst according to the first embodiment.
- FIG. 3 is a schematic diagram showing a schematic configuration of a regeneration system for a denitration catalyst according to the second embodiment.
- FIG. 4 is a flowchart showing an example of a method for regenerating a denitration catalyst according to the second embodiment.
- FIG. 5 is a graph showing the measurement result of the performance recovery rate of the catalyst of the example of the regeneration method.
- FIG. 6 is a graph showing the measurement result of the catalyst surface silica concentration in the example of the regeneration method.
- FIG. 1 is a schematic diagram showing a schematic configuration of a denitration catalyst regeneration system of the first embodiment.
- FIG. 2 is a flowchart showing an example of the regeneration method of the denitration catalyst according to the first embodiment.
- FIG. 3 is a schematic diagram showing a
- FIG. 7 is a graph showing measurement results of catalyst surface calcium in an example of the regeneration method.
- FIG. 8 is a graph showing the measurement result of the performance recovery rate of the catalyst of the example of the regeneration method.
- FIG. 9 is a graph showing the measurement result of the catalyst surface silica concentration in the example of the regeneration method.
- FIG. 10 is a graph showing the measurement results of catalyst surface calcium in an example of the regeneration method.
- FIG. 11 is a graph showing the measurement results of the relationship between the treatment time for chemical washing and the concentration of deposits on the catalyst surface.
- FIG. 12 is a graph showing the measurement results of the relationship between the treatment time for chemical washing and the performance recovery rate of the denitration catalyst.
- FIG. 13 is a graph showing measurement results of the relationship between the number of times the chemical solution is used and the performance recovery rate of the denitration catalyst.
- FIG. 14A is a graph showing a measurement result of the relationship between the number of times the finish cleaning liquid is used and the performance recovery rate of the denitration catalyst.
- FIG. 14B is a graph showing a measurement result of the relationship between the number of times the finish cleaning liquid is used and the performance recovery rate of the denitration catalyst.
- FIG. 15A is a graph showing a measurement result of the relationship between the number of times the finish cleaning liquid is used and the performance recovery rate of the denitration catalyst.
- FIG. 15B is a graph showing a measurement result of the relationship between the number of times the finish cleaning liquid is used and the performance recovery rate of the denitration catalyst.
- First Embodiment 1-1 Cleaning agent
- the cleaning agent of 1st Embodiment is demonstrated.
- the cleaning agent of this embodiment is an aqueous cleaning agent containing at least a fluorine compound and an inorganic acid.
- the fluorine compound examples include ammonium hydrogen fluoride (NH 4 HF 2 ) and ammonium fluoride (NH 4 F).
- the fluorine compound is preferably ammonium hydrogen fluoride.
- the amount of ammonium hydrogen fluoride can be, for example, 1 to 10% by mass relative to the entire cleaning agent, and is preferably in the range of 1 to 5% by mass.
- inorganic acids examples include sulfamic acid (H 3 NSO 3 ), hydrochloric acid (HCl), sulfuric acid (H 2 SO 4 ), and boric acid (H 3 BO 3 ).
- the inorganic acid is preferably hydrochloric acid or hydrochloric acid and boric acid. Boric acid can also function as a rust inhibitor.
- the amount of boric acid can be, for example, 0.001 to 10% by mass with respect to the cleaning agent.
- the inorganic acid is also preferably sulfamic acid.
- the amount of the inorganic acid is preferably added such that the pH value of the cleaning agent is in the range of pH 1 to 6, and more preferably in the range of pH 1 to 3. If the amount of the acid is such that the pH value of the cleaning agent is within the above range, other than the inorganic acid can be added.
- the cleaning agent preferably further contains a surfactant.
- a surfactant a nonionic or anionic surfactant is more preferable.
- the nonionic surfactant is preferably a non-phosphoric surfactant based on polyoxyethylene polyoxypropylene glycol, polyoxyethylene derivative, or polyalkylene glycol derivative.
- the ethylene oxide (EO) content of polyoxyethylene polyoxypropylene glycol can be, for example, 39% by mass.
- Non-phosphoric surfactants based on polyoxyethylene polyoxypropylene glycol include Braunon P-101M (Aoki Yushi Kogyo Co., Ltd.), Emulgen PP-220 (Kao Co., Ltd.), New Pole PE-61, New Pole PE-62, New Pole PE-64, New Pole PE-68, New Pole PE-71, New Pole PE-74, New Pole PE-75, New Pole PE-78, New Pole PE-108, etc. (Sanyo Evan 410, Evan 420, Evan 450, Eban 485, Evan 680, Evan 710, Evan 720, Evan 740, Evan 750, Evan 785, Evan U-103, Evan U-105, Evan U-108, etc.
- Pronon # 056 Pronon # 1 1P, Pronon # 105, Pronon # 124, Pronon # 124P, Pronon # 154, Pronon # 188P, Pronon # 201, Pronon # 202, Pronon # 204, Pronon # 208, Pronon # 235, Pronon # 235P, Pronon # 237P, Pronon # 238, Pronon # 407P, UniLube (registered trademark) 70DP-950B, Uniluve 75DE-2620R, etc.
- Non-phosphate surfactants mainly composed of a polyalkylene glycol derivative include Master Air 404 (manufactured by BASF), Foam Killer M-14 (manufactured by Aoki Yushi Kogyo Co., Ltd.), Dispanol WI-115 (Japan) Yuryu Co., Ltd.), UniLube 50MB-2, UniLube 50MB-5, UniLube 50MB-11, UniLube 50MB-26, UniLube 50MB-72, UniLube 60MB-2B, UniLube 60MB-16, UniLube 60MB-26, UniLube 75DE-15 , UNILOVE 75DE-25, UNILOVE 75DE-60, UNILOVE 75DE-170, UNILOVE 75DE-2620, UNILOVE 75DE-3800, UNILOVE 80
- a phosphate ester surfactant mainly composed of a phosphate ester such as polyoxyalkylene alkyl ether phosphate or a salt thereof is preferable.
- a surfactant mainly composed of a phosphate ester such as polyoxyethylene alkyl ether phosphate ester is preferable, and polyoxyethylene alkyl (C8) ether phosphate ester / monoethanolamine salt Of these, surfactants containing as the main component are more preferred.
- Examples of phosphate ester surfactants based on phosphate esters or salts thereof include Antox® EHD-PNA, New Coal® 100-FCP, Antox® EHD-400, etc.
- Prisurf® A208F examples include Plysurf A208N, Plysurf A210D, Plysurf M208F, etc. (manufactured by Daiichi Kogyo Co., Ltd.).
- the amount of the surfactant can be, for example, 0.001 to 10% by mass with respect to the entire cleaning agent.
- FIG. 1 shows a schematic configuration of a denitration catalyst regeneration system according to the first embodiment.
- the denitration catalyst regeneration system 100 shown in FIG. 1 executes a process for recovering the catalyst performance of the denitration catalyst.
- the target denitration catalyst was poisoned by using it for denitration of exhaust gas containing poisonous substances such as silica, calcium, phosphorus, arsenic, sodium, potassium, etc. produced from coal-fired boilers, and its catalytic performance decreased. Used denitration catalyst.
- the target denitration catalyst includes a lattice (honeycomb) catalyst, a plate catalyst, and a corrugated catalyst.
- the denitration catalyst contains, for example, titanium dioxide (TiO 2 ) as a carrier and contains at least one of vanadium (V), tungsten (W), and molybdenum (M réelle) as an active component.
- the denitration catalyst regeneration system 100 includes a pre-washing unit 102, a chemical solution washing unit 104, a finish washing unit 106, and a drying unit 108.
- the pre-washing unit 102 is configured to wash the denitration catalyst with water and remove foreign matter, ash, soluble calcium, and the like attached to the denitration catalyst.
- As the pre-washing unit 102 there can be used a water tank and a mechanism for supplying water to the water tank, in which a denitration catalyst is introduced into the water tank in which water is stored and water is immersed in the denitration catalyst.
- the pre-washing unit 102 As the pre-washing unit 102, a device that has a shower nozzle or the like, drips water on the denitration catalyst, and immerses water in the denitration catalyst can also be used.
- the denitration catalyst may be washed with water to remove foreign matters, but a liquid in which components for washing the denitration catalyst are mixed may be used.
- the chemical solution cleaning unit 104 is configured to immerse the denitration catalyst in a chemical solution (cleaning agent) and remove foreign matters attached to the denitration catalyst.
- the chemical solution of the present embodiment contains at least an inorganic acid and a fluorine compound. That is, the chemical solution is a mixed solution of an inorganic acid and a fluorine compound, and the cleaning agent of this embodiment can be suitably used.
- the chemical cleaning unit 104 has a water tank and a mechanism for supplying the chemical solution to the water tank, and a device for introducing the denitration catalyst into the water tank storing the chemical solution and immersing the chemical solution in the denitration catalyst. Can be used.
- a device that has a shower nozzle or the like applies a chemical solution to the denitration catalyst, and immerses the chemical solution in the denitration catalyst can be used.
- the finish washing unit 106 is configured to finish and wash the denitration catalyst in which the chemical solution is immersed in the chemical solution washing unit 104 with the finish washing solution, thereby removing and reducing the chemical solution adhering to the denitration catalyst.
- the finish washing unit 106 has a water tank and a mechanism for supplying the finish cleaning liquid to the water tank.
- the denitration catalyst is put into the water tank in which the finish cleaning liquid is stored, and the finish washing liquid is immersed in the denitration catalyst and adheres to the denitration catalyst.
- a device that removes and reduces the chemical solution that is present can be used.
- As the finish washing section 106 a device that has a shower nozzle or the like, applies a finish washing solution to the denitration catalyst, and removes and reduces the chemical solution adhering to the denitration catalyst can be used.
- the finish cleaning liquid examples include water (H 2 O), sulfamic acid (H 3 NSO 3 ), and a mixture thereof.
- the finishing cleaning liquid preferably contains sulfamic acid. That is, the finish cleaning liquid is preferably a mixed liquid of water and sulfamic acid having a predetermined concentration (hereinafter also referred to as sulfamic acid-containing water).
- the amount of sulfamic acid is, for example, 0.5 mol / l to 5 mol / l with respect to water.
- the drying unit 108 is configured to remove moisture from the denitration catalyst that has been finished and washed by the finish washing unit 106.
- the drying unit 108 is configured to remove moisture adhering to the denitration catalyst by ventilating a gas heated to 100 ° C. or higher, for example, 1 ° C. gas, to the denitration catalyst.
- the drying unit 108 only needs to be able to remove moisture, and the dried air may be sent to the denitration catalyst to blow off the moisture. Further, the drying unit 108 may dry the denitration catalyst in a space heated to 100 ° C. or higher.
- FIG. 2 is a flowchart showing an example of the regeneration method for the denitration catalyst according to the first embodiment.
- the denitration catalyst regeneration method shown in FIG. 2 can be realized by executing processing in each part of the denitration catalyst regeneration system 100.
- the regeneration method of the denitration catalyst of the present embodiment includes a prewashing step, a chemical solution washing step, a step of taking out the denitration catalyst, and a finishing washing step.
- the denitration catalyst is washed with water by the prewash unit 102 (step S12).
- the denitration catalyst is washed with water in the pre-washing unit 102 to remove foreign substances adhering to the surface, so that liquid can easily enter the denitration catalyst.
- the denitration catalyst regeneration system 100 as the chemical solution cleaning step, when the denitration catalyst is pre-washed, the denitration catalyst washed with water in the chemical solution cleaning unit 104 is immersed in a chemical solution containing an inorganic acid and a fluorine compound (step S14).
- the denitration catalyst is immersed in a chemical solution for 15 minutes to 60 minutes.
- a substance attached to the denitration catalyst specifically, silica (SiO 2 ) or the like is removed by immersing the denitration catalyst in a chemical solution.
- the denitration catalyst regeneration system 100 As the step of taking out the denitration catalyst, in the denitration catalyst regeneration system 100, after the denitration catalyst is immersed in the chemical solution, the denitration catalyst is taken out from the chemical solution. Thereafter, in the denitration catalyst regeneration system 100, as a final washing step, the denitration catalyst taken out from the chemical solution is subjected to final washing using the final washing liquid in the final washing unit 106 (step S16). In the denitration catalyst regeneration system 100, the chemical solution adhering to the denitration catalyst is removed by finishing washing in the finish washing unit 106.
- the present embodiment by using a mixed solution containing an inorganic acid and a fluorine compound as a chemical solution, it is possible to efficiently remove hardly soluble silica while suppressing the elution of active components such as vanadium from the denitration catalyst. It is possible to increase the recovery rate of the performance of the denitration catalyst. That is, it can be regenerated to a denitration catalyst with high catalytic performance. As a result, the catalyst performance can be improved without performing the treatment of impregnating the active component of the catalyst after the finish washing in the finish washing section.
- an impregnation step in which eluted vanadium is immersed in a vanadyl sulfate (VOSO 4 ) aqueous solution and supported again. Steps such as a subsequent drying step can be omitted. Thereby, the man-hour increase of the regeneration process by the impregnation process of an active ingredient can be suppressed.
- NaOH alkaline sodium hydroxide
- VOSO 4 vanadyl sulfate
- the chemical solution particularly preferably contains hydrochloric acid as an inorganic acid.
- hydrochloric acid as the inorganic acid, calcium can be dissolved, and calcium can be prevented from adhering to the denitration catalyst during the regeneration treatment.
- the chemical solution further contains boric acid in hydrochloric acid as an inorganic acid.
- boric acid By adding boric acid to the chemical solution, it is possible to suppress the elution of iron from the pack frame of the denitration catalyst, and it is possible to suppress an increase in the SO 2 oxidation rate in the chemical solution.
- the chemical solution preferably uses ammonium hydrogen fluoride as the fluorine compound.
- the chemical solution further contains a surfactant.
- the chemical solution is preferably a mixed solution of an inorganic acid, a fluorine compound, and a surfactant.
- medical solution can suppress that calcium adheres to a denitration catalyst at the time of a regeneration process by containing surfactant.
- the recovery rate of the performance of the denitration catalyst can be further increased, and the reduction in the crushing strength of the denitration catalyst can be suppressed. That is, it can be regenerated to a denitration catalyst with higher catalyst performance, that is, the number of times the chemical solution is used can be increased.
- the temperature required for the chemical washing step can be lowered, and the time required for the chemical washing step can be shortened. As a result, the processing cost of the reproduction process can be reduced.
- surfactants include phosphate surfactants and non-phosphate surfactants.
- examples of the phosphoric acid surfactant include phosphate esters such as polyoxyalkylene alkyl ether phosphate esters or salts thereof.
- examples of the non-phosphate surfactant include polyoxyethylene polyoxypropylene glycol, polyoxyethylene derivatives, and polyoxyethylene derivatives.
- hydrochloric acid as a mineral acid and a mixed solution of boric acid and ammonium hydrogen fluoride as a fluorine compound
- sulfamic acid as an inorganic acid and ammonium hydrogen fluoride as a fluorine compound
- a mixed liquid mixture As a chemical solution containing an inorganic acid and a fluorine compound, hydrochloric acid as a mineral acid and a mixed solution of boric acid and ammonium hydrogen fluoride as a fluorine compound; sulfamic acid as an inorganic acid and ammonium hydrogen fluoride as a fluorine compound A mixed liquid mixture; or a mixed liquid obtained by mixing hydrochloric acid as an inorganic acid and ammonium hydrogen fluoride as a fluorine compound is exemplified.
- a mixed solution in which sulfamic acid as an inorganic acid, a phosphate ester as a surfactant, and ammonium hydrogen fluoride as a fluorine compound are mixed a mixed solution in which sulfamic acid as an inorganic acid, a phosphate ester as a surfactant, and ammonium hydrogen fluoride as a fluorine compound are mixed; sulfamine as an inorganic acid Mixture of acid, polyoxyethylene derivative as surfactant and ammonium hydrogen fluoride as fluorine compound; hydrochloric acid and boric acid as inorganic acid, phosphate ester as surfactant and ammonium hydrogen fluoride as fluorine compound;
- the mixed liquid mixture include hydrochloric acid and boric acid as the inorganic acid, a polyoxyethylene derivative as the surfactant, and ammonium hydrogen fluoride as the fluorine compound.
- the finishing cleaning liquid contains sulfamic acid. That is, the finish cleaning liquid is preferably a mixed liquid of water and sulfamic acid.
- the finishing cleaning liquid containing sulfamic acid calcium and alumina on the surface of the catalyst after the regeneration treatment can be reduced. For this reason, the recovery rate of catalyst performance can be made higher. Thereby, even if a chemical
- FIG. 3 shows a schematic configuration of a regeneration system for a denitration catalyst according to the second embodiment.
- the denitration catalyst regeneration system 100a of the second embodiment shown in FIG. 3 can be combined with the denitration catalyst regeneration system 100 and other embodiments. This point is the same also in other embodiments, each embodiment is an example, and other embodiments can be combined with a part thereof.
- the denitration catalyst regeneration system 100a includes a pre-washing unit 102a, a chemical solution washing unit 104a, a finishing washing unit 106a, a drying unit 108, and a catalyst transport device 112.
- the catalyst transport device 112 is a device that removes the denitration catalyst from the denitration facility where the denitration catalyst is installed, and transports the removed denitration catalyst.
- the catalyst transport device 112 can include a crane that transports the catalyst, a vehicle, a cart that is moved manually, and the like.
- the pre-washing unit 102a includes a preliminary washing tank 114, a water supply device 116, a waste liquid tank 117, a vacuum tank 118, a waste liquid tank 119, and a vacuum pump 120.
- the preliminary rinsing tank 114 is a container that is larger than the denitration catalyst to be regenerated and can store liquid.
- the water supply device 116 has a tank for storing water, a valve for controlling the supply of water, and the like, so that water used for pre-washing and vacuuming is supplied to each of the preliminary washing tank 114 and the vacuuming tank 118. It is configured.
- the waste liquid tank 117 is a container for storing water discharged from the preliminary flush tank 114.
- the evacuation tank 118 is a container that is larger than the denitration catalyst to be regenerated and can store liquid.
- the vacuum evacuation tank 118 of the present embodiment has a lid or the like, is configured so that a denitration catalyst can be taken in and out, and the inside can be sealed.
- the waste liquid tank 119 is a container for storing water discharged from the vacuum suction tank 118.
- the pre-washing unit 102a may use the waste liquid tank 117 and the waste liquid tank 119 as one tank.
- the vacuum pump 120 is configured to suck air in the vacuum chamber 118.
- the chemical cleaning unit 104a includes a chemical cleaning tank 122, a chemical supply device 123, and a waste liquid tank 129.
- the chemical washing tank 122 is a container that is larger than the denitration catalyst to be regenerated and can store liquid.
- the chemical solution supply device 123 includes a tank that stores the chemical solution, a valve that controls supply of the chemical solution, and the like, and is configured to supply the chemical solution used for the chemical solution cleaning to the chemical washing tank 122.
- the waste liquid tank 129 is a container that stores the chemical liquid discharged from the chemical washing tank 122.
- the finishing washing section 106 a includes a finishing water washing tank 130, a supply device 132, and a waste liquid tank 134.
- the finishing water washing tank 130 is a container that is larger than the denitration catalyst to be regenerated and can store liquid.
- the supply device 132 includes a tank for storing the finishing cleaning liquid described in the present specification, a valve for controlling the supply of the finishing cleaning liquid, and the like, and is configured to supply the finishing cleaning liquid to the finishing water washing tank 130.
- the waste liquid tank 134 is a container for storing the finishing cleaning liquid discharged from the finishing water washing tank 130.
- the drying unit 108 has the same configuration as the drying unit 108 of the denitration catalyst regeneration system 100.
- FIG. 4 is a flowchart showing an example of a regeneration method for the denitration catalyst according to the second embodiment.
- the denitration catalyst regeneration method shown in FIG. 4 can be realized by executing processing in each part of the denitration catalyst regeneration system 100a.
- the method for regenerating a denitration catalyst of the present embodiment includes a pre-washing step, a chemical solution washing step, a finishing washing step, and a drying step.
- the catalyst removal device 112 takes out the denitration catalyst from the denitration facility, and moves the taken out denitration catalyst to the preliminary washing tank 114 (step S22).
- the denitration catalyst is washed with water in the preliminary washing tank 114 (step S24).
- water may be supplied to the preliminary flush tank 114 by the water supply device 116, or the preliminary flush tank 114 may be supplied by the water supply device 116.
- the denitration catalyst may be supplied to the preliminary washing tank 114 in a state where the water is stored.
- the denitration catalyst is moved to the vacuum drawing tank 118 by the catalyst transfer device 112 (step S26).
- the vacuum pump 120 sucks the air in the vacuum evacuation tank 118 into a vacuum state (step S28).
- the vacuum chamber 118 is evacuated so that foreign matter can be sucked when the inside of the denitration catalyst is clogged with foreign matter.
- the vacuum chamber 118 when the vacuum chamber 118 is in a vacuum state, the vacuum chamber 118 is opened to atmospheric pressure, and the catalyst transport device 112 moves the denitration catalyst from the vacuum chamber 118 to the chemical tank 122 (step). S30).
- pre-washing is executed by the processing from step S24 to step S28 to remove foreign matter adhering to the surface, so that liquid easily enters the inside of the denitration catalyst.
- step S32 As the chemical solution washing step, in the denitration catalyst regeneration system 100a, after the denitration catalyst is moved to the chemical washing tank 122, the denitration catalyst is immersed in the chemical solution in the chemical washing tank 122 (step S32).
- the denitration catalyst regeneration system 100 a after the denitration catalyst is moved to the chemical washing tank 122, the chemical solution is supplied into the chemical washing tank 122 so that the denitration catalyst disposed in the chemical washing tank 122 is immersed in the chemical solution.
- the denitration catalyst may be moved to the chemical washing tank 122 in which the chemical liquid is stored, and the denitration catalyst disposed in the chemical washing tank 122 may be immersed in the chemical liquid.
- the processing in step S32 is chemical cleaning.
- the catalyst removal device 122 is moved from the chemical washing tank 122 to the final water washing tank 130 by the catalyst transport device 112 (step S34).
- the denitration catalyst regeneration system 100a after the denitration catalyst is moved to the finishing water washing tank 130, the denitration catalyst is washed in the finishing water washing tank 130 (finish washing is performed) (step S36).
- the finishing cleaning liquid is supplied from the supply device 132 into the finishing water washing tank 130, and the denitration catalyst is cleaned with the finishing cleaning liquid.
- the finishing cleaning liquid may be stored in the finishing water washing tank 130, or the processing may be performed while discharging the finishing washing liquid in the finishing water washing tank 130.
- the denitration catalyst is moved to the drying unit 108, and the denitration catalyst is dried by the drying unit 108 (step S38).
- the denitration catalyst regeneration system 100a sucks air in the vacuum chamber 118 during pre-washing, thereby reducing the air pressure in the vacuum chamber 118 and bringing it closer to vacuum. As a result, the air remaining in the denitration catalyst can be sucked, and the foreign matter blocking the gap of the denitration catalyst can be more reliably removed.
- the chemical solution can be efficiently used by repeatedly using the chemical solution in the denitration catalyst regeneration system 100a.
- the chemical solution containing the inorganic acid and the fluorine compound can suppress the reattachment of calcium, so that the silica removal performance can be maintained even when used multiple times.
- the denitration catalyst is immersed in the chemical solution in the chemical washing tank 122, and the chemical solution in which the denitration catalyst is immersed is removed from the chemical washing tank 122 after that. It is not discharged into 129 but stored in the chemical washing tank 122. Thereafter, the next denitration catalyst is moved to the chemical washing tank 122 in which the chemical solution is stored.
- the chemical solution can be repeatedly used in the denitration catalyst regeneration system 100a.
- the denitration catalyst regeneration system 100a may adjust the components of the chemical solution when the second or subsequent chemical solution is used, that is, when the second and subsequent denitration catalysts are immersed.
- an inorganic acid or a fluorine compound may be additionally added.
- the denitration catalyst regeneration system 100a maintains the state in which the chemical solution is stored in the waste liquid tank 129 without being discharged from the chemical washing tank 122 even after the denitration catalyst is taken out from the chemical solution.
- the chemical cleaning unit 104a is provided with a tank for temporarily storing the chemical solution and a circulation mechanism for circulating the chemical solution.
- the chemical solution is once discharged from the chemical washing tank 122 into the tank, and when used, the chemical solution is put into the chemical washing tank 122 from the tank by the circulation mechanism.
- the chemical solution may be charged again.
- a filter or the like may be provided in the circulation mechanism to remove foreign substances in the chemical solution.
- the finishing cleaning solution is water in the denitration catalyst regeneration system 100a
- water is used efficiently by repeatedly using the water used for pre-washing and finishing washing. be able to.
- the amount of waste liquid can be reduced.
- the preliminary washing tank 114, the vacuum drawing tank 118, and the finishing washing tank 130 After the denitration catalyst that has been washed with water is taken out from the preliminary washing tank 114, the vacuum drawing tank 118, and the finishing washing tank 130, the preliminary washing tank 114, the vacuum drawing tank 118, and the finishing The state where water is stored in the water washing tank 130 may be maintained, and the next denitration catalyst may be moved to perform water washing.
- the final cleaning solution is sulfamic acid-containing water, and only the sulfamic acid-containing water in the finishing water washing tank 130 is maintained and the state where the sulfamic acid-containing water is stored is maintained. Also good.
- a tank for temporarily storing water and a circulation mechanism for circulating water are also provided for the preliminary washing tank 114, the vacuum drawing tank 118, and the finishing washing tank 130, and the preliminary washing tank 114, the vacuum drawing tank 118, and the finishing washing tank 130 are provided.
- the water may be once discharged from the tank into the tank, and when used, the water may be supplied again from the tank to the preliminary washing tank 114, the vacuum drawing tank 118, and the finishing washing tank 130 by the circulation mechanism.
- a filter or the like may be provided in the circulation mechanism to remove foreign matters contained in the water.
- the finishing washing liquid is sulfamic acid-containing water, and the tank for temporarily storing the sulfamic acid-containing water or the sulfamic acid-containing water is circulated only to the finishing washing tank 130.
- a circulation mechanism may be provided so that the sulfamic acid-containing water is once discharged from the finishing water washing tank 130 into the tank, and when used, the sulfamic acid-containing water may be reintroduced from the tank into the pre-finishing washing tank 130 by the circulation mechanism.
- a filter or the like may be provided in the circulation mechanism to remove foreign matters contained in the sulfamic acid-containing water, and a concentration meter may be provided in the circulation mechanism so that the concentration of sulfamic acid in the finish cleaning liquid Depending on, sulfamic acid-containing water may be added.
- the denitration catalyst regeneration system 100a is provided as separate water tanks for performing pre-washing, evacuation, chemical cleaning, and finishing washing, but one water tank capable of performing each step. May be provided. Further, in the above processing method, the case has been described in which the denitration catalyst is removed from the denitration facility, but the denitration catalyst may be regenerated while being installed in the denitration catalyst. In this case, water and chemicals are supplied to the denitration facility, and the waste liquid is recovered from the denitration facility.
- the denitration catalyst regeneration system 100a may further include a chemical temperature adjusting mechanism for adjusting the temperature of the chemical.
- a chemical temperature adjusting mechanism for adjusting the temperature of the chemical.
- the denitration catalyst regeneration method, the denitration catalyst regeneration system, and the denitration catalyst cleaning agent according to the present invention are not limited to the following examples.
- the denitration catalyst regeneration method is implemented using multiple chemicals with different inorganic acids and fluorine compounds to be mixed, and the catalyst performance recovery rate of the denitration catalyst when each chemical solution is used (catalyst performance after regeneration treatment / new article) Catalyst performance at the time: K / K0), silica concentration (mass%) on the surface of the denitration catalyst, and calcium concentration (mass%) on the surface of the denitration catalyst.
- the catalyst reaction rate constant was used as an indicator of catalyst performance.
- Example 1 Preparation of drug solution I
- HCl hydrochloric acid
- NH 4 HF 2 ammonium hydrogen fluoride
- Example 2 0.8% by mass of hydrochloric acid as an inorganic acid, 0.15% by mass of boric acid (H 3 BO 3 ) as an inorganic acid, and ammonium fluoride as a fluorine compound having a hydrogen fluoride content of 0.9%
- medical solution mixed in the ratio used as the mass% was used.
- Example 3 a chemical solution in which 3.5% by mass of sulfamic acid as an inorganic acid and ammonium hydrogen fluoride as a fluorine compound at a ratio of 1% by mass of hydrogen fluoride was used.
- Comparative Example 1 a chemical solution in which oxalic acid (C 2 H 2 O 4 ) is mixed as an organic acid at 2.0% by mass and ammonium fluoride as a fluorine compound at a ratio of 1% by mass is used. It was. In Comparative Example 2, oxalic acid was 2.0% by mass as an organic acid, phosphoric acid ester was 0.05% by mass as a surfactant, and ammonium fluoride was 1% by mass of hydrogen fluoride as a fluorine compound. The chemical solution mixed in was used.
- Performance I 5 to 7 show the measurement results of the denitration catalyst regenerated in Examples 1 to 3, Comparative Example 1 and Comparative Example 2, a new denitration catalyst, and the denitration catalyst before regeneration.
- the measurement result of the catalyst performance recovery rate (K / K0) of the catalyst of the Example of a regeneration method is shown.
- concentration (mass%) of the Example of a regeneration method is shown.
- concentration (mass%) of the Example of a regeneration method is shown.
- the measurement result of the catalyst surface calcium concentration (mass%) of the Example of a regeneration method is shown.
- Example 1 and Example 2 by using hydrochloric acid as the inorganic acid, the performance recovery rate of the catalyst is increased compared to Comparative Examples 1, 2, and Example 3, and the adhesion of calcium is increased. It was found that it can be drastically reduced.
- Example 4 Preparation of drug solution II
- 0.8% by mass of hydrochloric acid, 0.15% by mass of boric acid, 0.05% by mass of phosphoric acid ester as a surfactant, and 0.9% by mass of hydrogen fluoride of ammonium hydrogen fluoride A chemical solution mixed at a ratio of% was used.
- Example 5 a chemical solution prepared by mixing hydrochloric acid with 0.8% by mass, phosphoric acid ester with 0.05% by mass as a surfactant, and ammonium fluoride with a hydrogen fluoride content of 0.9% by mass was mixed. Using.
- Example 6 0.8% by mass of hydrochloric acid, 0.15% by mass of boric acid, 0.05% by mass of polyoxyethylene derivative as a surfactant, and 0.9% of hydrogen fluoride in hydrogen fluoride were used.
- medical solution mixed in the ratio used as the mass% was used.
- Example 7 a chemical solution in which sulfamic acid was mixed at 3.5% by mass, phosphoric acid ester as a surfactant was mixed at 0.05% by mass, and ammonium fluoride was mixed at a ratio of 1% by mass of hydrogen fluoride was used. It was.
- Example 8 3.5% by mass of sulfamic acid, 0.05% by mass of a phosphoric acid ester different from Example 7 as a surfactant, and 1% by mass of hydrogen fluoride of ammonium hydrogen fluoride
- medical solution mixed in the ratio used as above was used.
- Example 9 a chemical solution prepared by mixing sulfamic acid at 3.5% by mass, polyoxyethylene derivative as a surfactant at 0.05% by mass, and ammonium fluoride at a ratio of 1% by mass of hydrogen fluoride. Using.
- Performance II 8 to 10 show the measurement results of the denitration catalyst regenerated in Examples 4 to 9, Comparative Example 1 and Comparative Example 2, a new denitration catalyst, and the denitration catalyst before regeneration.
- FIG. 8 the measurement result of the catalyst performance recovery rate of the catalyst of the Example of a regeneration method is shown.
- FIG. 9 the measurement result of the catalyst surface silica density
- FIG. 10 the measurement result of the catalyst surface calcium concentration of the Example of a regeneration method is shown.
- Examples 4 to 9 the surfactant is included in the chemical solution, so that the performance recovery rate of the catalyst is increased as compared with Comparative Examples 1 and 2, and calcium is used. It was found that the adhesion of can be drastically reduced. Further, as shown in Examples 4 to 9, when only hydrochloric acid is used as an inorganic acid, hydrochloric acid and boric acid are used, and sulfamic acid is used in any case, calcium adhesion is dramatically improved. It was found that it can be reduced. That is, when hydrochloric acid is used as the inorganic acid, the adhesion of calcium is dramatically improved in Example 4 using the chemical solution containing the surfactant than in Example 1 not containing the chemical solution containing the surfactant.
- phosphorus is known to be a deterioration component of the catalyst.
- the catalyst performance is increased. It was found that the adhesion of calcium can be drastically reduced.
- treatment time the time for which the denitration catalyst is immersed in the chemical (treatment time: minutes) and the catalyst performance recovery rate of the denitration catalyst (catalyst performance after regeneration treatment / catalyst performance when new: K / K0), the silica concentration (mass%) on the surface of the denitration catalyst, and the calcium concentration (mass%) on the surface of the denitration catalyst were measured.
- FIGS. 11 and 12 The measurement results are shown in FIGS.
- FIG. 11 the measurement result of the relationship between processing time and the density
- FIG. 12 the measurement result of the relationship between processing time and the performance recovery rate of a denitration catalyst is shown.
- the performance recovery rate of the denitration catalyst is recovered to 0.8, that is, 80% or more of the new product while maintaining the calcium concentration low. I knew it was possible. Moreover, it can suppress that processing time becomes long because processing time shall be 60 minutes or less.
- Example 10 Examination of the number of times of use Next, the chemical solution was repeatedly used, and the relationship between the number of times of use and the catalyst performance recovery rate of the denitration catalyst (catalyst performance after regeneration treatment / catalyst performance when new: K / K0) was measured. Even when the chemical solution was repeatedly used, an amount of inorganic acid and fluoride corresponding to the amount reacted by the previous regeneration treatment was added each time it was used.
- Example 10 3.5% by mass of sulfamic acid as an inorganic acid, 0.05% by mass of the same phosphate ester as in Example 8 as a surfactant, and ammonium fluoride as a fluorine compound with a hydrogen fluoride content of 1%.
- Example 11 The chemical
- Example 11 the same chemical solution as in Example 10 was used, and the amount of inorganic acid and fluorine compound added each time it was used was doubled.
- Example 12 hydrochloric acid as an inorganic acid was 0.8% by mass, boric acid as an inorganic acid was 0.15% by mass, ammonium fluoride as a fluorine compound was 0.9% by mass in a hydrogen fluoride content.
- a mixed chemical was used.
- FIG. 13 shows the measurement results of the relationship between the number of times the chemical solution is used and the catalyst performance recovery rate of the denitration catalyst for Example 10 to Example 12. As shown in FIG. 13, it was found that the catalyst performance can be recovered to the same level even if the chemical solution is used repeatedly. Therefore, it was found that the amount of chemical solution used and the amount of waste can be reduced.
- Example 13 a cleaning liquid prepared so as to be 0.5 mol / l of sulfamic acid was used as a final cleaning liquid.
- Example 13 the same chemical solution as in Example 10 was used as the chemical solution.
- Example 14 a cleaning solution prepared to be 1 mol / l sulfamic acid was used as the final cleaning solution.
- Example 14 5.3% by mass of sulfamic acid as the inorganic acid, 0.075% by mass of phosphate ester as the surfactant, and 1.5% by mass of hydrogen fluoride as the fluorine compound and 1.5% by mass of hydrogen fluoride. A chemical solution mixed at a ratio of% was used.
- FIGS. 14A and 14B show the catalyst performance recovery rate for Example 13 when the cleaning liquid is used twice and eight times, and 1 when the final cleaning liquid is water.
- FIG. 14B shows the catalyst performance recovery rate of the denitration catalyst when the cleaning liquid is used once and five times for Example 13 and Example 14.
- the performance recovery of the denitration catalyst can be increased by 15% or more even when the cleaning liquid is used twice more than when the final cleaning liquid is only water. It was found that the performance recovery rate of the denitration catalyst can be maintained at a high level of 10% or more even when the cleaning liquid is repeatedly used 8 times. Further, as shown in FIG.
- Example 14B it was found that Example 14 containing 1 mol / l of sulfamic acid can maintain the same catalyst performance recovery rate as Example 13 even when the cleaning liquid is used repeatedly five times. From the results, it was found that when the concentration of sulfamic acid in the final cleaning liquid is at least 0.5 mol, the catalyst performance recovery rate of the denitration catalyst can be maintained high even if the cleaning liquid is used repeatedly.
- a denitration catalyst regeneration method was implemented using multiple chemicals (cleaning agents) with different surfactants, and the crushing strength and performance of the denitration catalyst were restored when each chemical solution was used. The rate was measured.
- a denitration catalyst a denitration catalyst after denitration treatment for 50,000 hours in an actual power plant was used as a test sample.
- the denitration catalyst was a honeycomb catalyst in which titanium dioxide (TiO 2 ) was the main component and vanadium pentoxide (V 2 O 5 ) and tungsten oxide (WO 3 ) were supported thereon.
- Example 15 Preparation of chemical solution III
- sulfamic acid 3.2% by mass of sulfamic acid, 0.05% by mass of a commercially available surfactant A mainly composed of polyoxyethylene polyoxypropylene glycol as a nonionic surfactant, and ammonium hydrogen fluoride
- a chemical solution mixed with a hydrogen fluoride content of 1.75% by mass was used.
- hydrochloric acid was 2.4% by mass
- boric acid was 0.15% by mass
- surfactant A as a nonionic surfactant was 0.05% by mass
- ammonium fluoride was 1% in hydrogen fluoride content.
- medical solution mixed in the ratio used as .26 mass% was used.
- Example 17 2.4% by mass of hydrochloric acid, 0.15% by mass of boric acid, 0.05% by mass of a commercially available surfactant B mainly composed of a polyalkylene glycol derivative as a nonionic surfactant, A chemical solution in which ammonium hydrogen fluoride was mixed at a ratio of hydrogen fluoride content of 1.26% by mass was used.
- Example 18 2.4 mass% hydrochloric acid, 0.15 mass% boric acid, and a commercially available polyoxyethylene alkyl (C8) ether phosphate ester / monoethanolamine salt as an anionic surfactant as main components
- Comparative Example 3 a chemical solution in which sulfamic acid was mixed at 3.2% by mass and ammonium hydrogen fluoride was mixed at a ratio of hydrogen fluoride content of 1.75% by mass was used.
- Comparative Example 4 a chemical solution was used in which hydrochloric acid was mixed at 2.4% by mass, boric acid at 0.15% by mass, and ammonium hydrogen fluoride in a proportion of 1.26% by mass of hydrogen fluoride.
- the reaction rate constant K0 of an unused denitration catalyst was determined by measuring the catalyst performance.
- each catalyst whose catalytic performance was lowered by the denitration treatment was subjected to a washing treatment using the washing liquid of each example.
- each catalyst was prewashed for 3 minutes and then immersed in a washing solution for 60 minutes for chemical washing. Thereafter, each catalyst after chemical washing was finished with water for 30 minutes and dried at 110 ° C. overnight.
- the reaction rate constant K was determined by the same method as the measurement of the catalyst performance.
- the catalyst performance recovery rate (catalyst performance after regeneration treatment / catalyst performance when new: K / K0) was determined in the same manner as in Examples 1 to 15.
- Example 15 As shown in Table 3, in Example 15 containing surfactant A, which is a nonionic surfactant, the wall crushing strength was 109.2 N / cm 2 , which was about 74% lower than the unwashed catalyst. It turned out that it can suppress. Moreover, in Example 15, it turned out that the catalyst performance with respect to a new denitration catalyst can be recovered to about 98%. On the other hand, in Comparative Example 3 does not contain a surfactant, the wall direction crush strength and 75.1N / cm 2, was found to decrease to about 51 percent relative to the unwashed catalyst. In Comparative Example 3, it was found that the catalyst performance for a new denitration catalyst was reduced to about 81%.
- surfactant A which is a nonionic surfactant
- Example 15 containing surfactant A which is a nonionic surfactant, can improve the reduction in the crushing strength in the wall direction and increase the recovery rate of the catalyst performance as compared with Comparative Example 3. all right.
- Example 16 containing Surfactant A which is a nonionic surfactant it was found that the wall direction crushing strength was 114.4 N / cm 2, and the decrease could be suppressed to about 77% with respect to the unwashed catalyst.
- Comparative Example 3 containing hydrochloric acid as an inorganic acid and no surfactant it was found that the wall crushing strength was 94.6 N / cm 2, which was about 64% lower than that of the unwashed catalyst.
- Example 15 and Example 16 containing surfactant A which is a nonionic surfactant, contain the same inorganic acid and fluorine compound, but compared with Comparative Example 3 and Comparative Example 4 containing no surfactant. Thus, it was found that the reduction in the crushing strength in the wall direction can be improved.
- Example 17 containing surfactant B which is a nonionic surfactant the wall direction crushing strength is 136.6 N / cm 2, which is about 92% lower than the unwashed catalyst. It turned out that it can suppress. Moreover, in Example 17, it turned out that the catalyst performance with respect to a new denitration catalyst can be recovered to about 108%. Therefore, Example 17 containing Surfactant B, which is a nonionic surfactant, can improve the reduction in the crushing strength in the wall direction as compared with Comparative Example 3 and Comparative Example 4, and recover the catalyst performance. I found that the rate could be high.
- Example 18 containing Surfactant C which is an anionic surfactant
- the wall crushing strength was 122.4 N / cm 2 and could be suppressed to about 83% of the unwashed catalyst. Therefore, it was found that Example 18 containing Surfactant C, which is an anionic surfactant, can improve the decrease in the crushing strength in the wall direction as compared with Comparative Example 3 and Comparative Example 4.
- Example 19 the same finishing cleaning liquid as in Example 14 was used as the finishing cleaning liquid, and the same chemical liquid as in Example 15 was used.
- FIGS. 15A and 15B show the catalyst performance recovery rate of the denitration catalyst in which the cleaning liquid was used once and five times for Example 19 when the final cleaning liquid was water.
- FIG. 15B shows the relationship between the number of times the cleaning liquid is used and the catalyst performance recovery rate of the denitration catalyst in Example 19.
- the catalyst performance recovery rate of the denitration catalyst was improved even when the cleaning solution was repeatedly used five times compared to the case where the final cleaning solution was only water. It was found that it can be increased by 5% or more. Further, as shown in FIG.
- the catalyst performance recovery rate of the denitration catalyst can be maintained at 90% or higher, and the cleaning liquid is used six times. However, it was found that the catalyst performance recovery rate of the denitration catalyst can be maintained as high as about 90%.
- the denitration catalyst regeneration method the denitration catalyst regeneration system, and the denitration catalyst cleaning liquid according to the present invention, it is possible to efficiently remove deposits attached to the surface of the catalyst, and to recover the catalyst performance to a high level. And the fall of crushing strength can be suppressed.
- Pulverized coal fired boiler 50 Denitration equipment 82a, 84a, 86a: Denitration catalyst 100, 100a: Denitration catalyst regeneration system 102, 102a: Pre-washing section 104, 104a: Chemical solution washing section 106, 106a: Finish washing section 108, 108a: Drying unit 112: Catalyst transfer device 114: Preliminary water washing tank 116: Water supply device 118: Vacuum suction tank 120: Vacuum pump 122: Chemical washing tank 130: Finishing water washing tank
Abstract
Description
1-1.洗浄剤
第1実施形態の洗浄剤について説明する。本実施形態の洗浄剤は、フッ素化合物と無機酸とを少なくとも含有する水溶液の洗浄剤である。
図1に、第1実施形態の脱硝触媒の再生システムの概略的な構成を示す。図1に示す脱硝触媒の再生システム100は、脱硝触媒の触媒性能を回復させる処理を実行する。対象となる脱硝触媒は、例えば、石炭焚きボイラから生じたシリカ、カルシウム、リン、砒素、ナトリウム、カリウム等の被毒物質を含む排ガスの脱硝に使用して被毒し、その触媒性能が低下した使用済みの脱硝触媒である。対象となる脱硝触媒は、格子状(ハニカム状)触媒、板状触媒、コルゲート状触媒を含む。また、脱硝触媒は、例えば、二酸化チタン(TiO2)を担体とし、活性成分としてバナジウム(V)、タングステン(W)、モリブデン(Mо)の少なくとも1つを含有する。
図2に、第1実施形態の脱硝触媒の再生方法の一例をフローチャートで示す。図2に示す脱硝触媒の再生方法は、脱硝触媒の再生システム100の各部で処理を実行することで、実現することができる。本実施形態の脱硝触媒の再生方法は、予洗いステップと、薬液洗浄ステップと、脱硝触媒を取り出すステップと、仕上げ洗いステップとを含む。
2-1.再生システム
図3に、第2実施形態の脱硝触媒の再生システムの概略的な構成を示す。図3に示す第2実施形態の脱硝触媒の再生システム100aは、脱硝触媒の再生システム100や他の実施形態と組み合わせることができる。この点は他の実施形態も同様であり、各実施形態は一例であり、その一部に他の実施形態を組み合わせることができる。
図4に、第2実施形態の脱硝触媒の再生方法の一例をフローチャートで示す。図4に示す脱硝触媒の再生方法は、脱硝触媒の再生システム100aの各部で処理を実行することで、実現することができる。本実施形態の脱硝触媒の再生方法は、予洗いステップと、薬液洗浄ステップと、仕上げ洗いステップと、乾燥ステップとを含む。
先ず、混合する無機酸とフッ素化合物を変化させた複数の薬液で脱硝触媒の再生方法を実施し、それぞれの薬液を用いた場合の脱硝触媒の触媒性能回復率(再生処理後の触媒性能/新品時の触媒性能:K/K0)、脱硝触媒の表面のシリカ濃度(質量%)、脱硝触媒の表面のカルシウム濃度(質量%)を計測した。触媒性能の指標として、触媒の反応速度定数を用いた。また、比較のために、有機酸とフッ素化合物を混合させた薬液で再生処理を行った例(比較例1)、有機酸とフッ素化合物と界面活性剤を混合させた薬液で再生処理を行った例(比較例2)についても、同様の計測を行った。また、比較のために、新品、再生前の脱硝触媒についても各値を計測した。
実施例1では、無機酸として塩酸(HCl)を0.8質量%、フッ素化合物としてフッ化水素アンモニウム(NH4HF2)をフッ化水素分が0.9質量%となる割合で混合した薬液を用いた。実施例2では、無機酸として塩酸を0.8質量%、無機酸としてホウ酸(H3BO3)を0.15質量%、フッ素化合物としてフッ化水素アンモニウムをフッ化水素分が0.9質量%となる割合で混合した薬液を用いた。実施例3では、無機酸としてスルファミン酸を3.5質量%、フッ素化合物としてフッ化水素アンモニウムをフッ化水素分が1質量%となる割合で混合した薬液を用いた。
図5から図7に、実施例1から実施例3、比較例1及び比較例2で再生した脱硝触媒、新品の脱硝触媒、再生前の脱硝触媒について計測した結果を示す。図5には、再生方法の実施例の触媒の触媒性能回復率(K/K0)の計測結果を示す。図6には、再生方法の実施例の触媒表面シリカ濃度(質量%)の計測結果を示す。図7には、再生方法の実施例の触媒表面カルシウム濃度(質量%)の計測結果を示す。
次に、界面活性剤を混合した複数の薬液を用いた脱硝触媒の再生方法を実施し、それぞれの薬液を用いた場合の脱硝触媒の触媒性能回復率(再生処理後の触媒性能/新品時の触媒性能:K/K0)、脱硝触媒の表面のシリカ濃度([質量%])、脱硝触媒の表面のカルシウム濃度(質量%)を計測した。
実施例4では、塩酸を0.8質量%、ホウ酸を0.15質量%、界面活性剤としてリン酸エステルを0.05質量%、フッ化水素アンモニウムをフッ化水素分が0.9質量%となる割合で混合した薬液を用いた。実施例5では、塩酸を0.8質量%、界面活性剤としてリン酸エステルを0.05質量%、フッ化水素アンモニウムをフッ化水素分が0.9質量%となる割合で混合した薬液を用いた。 実施例6では、塩酸を0.8質量%、ホウ酸を0.15質量%、界面活性剤としてポリオキシエチレン誘導体を0.05質量%、フッ化水素アンモニウムをフッ化水素分が0.9質量%となる割合で混合した薬液を用いた。実施例7では、スルファミン酸を3.5質量%、界面活性剤としてリン酸エステルを0.05質量%、フッ化水素アンモニウムをフッ化水素分が1質量%となる割合で混合した薬液を用いた。実施例8では、スルファミン酸を3.5質量%、界面活性剤として実施例7とは別の種類のリン酸エステルを0.05質量%、フッ化水素アンモニウムをフッ化水素分が1質量%となる割合で混合した薬液を用いた。実施例9では、スルファミン酸を3.5質量%、界面活性剤としてポリオキシエチレン誘導体を0.05質量%、フッ化水素アンモニウムをフッ化水素分が1質量%となる割合で混合した薬液を用いた。
図8から図10に、実施例4から実施例9、比較例1及び比較例2で再生した脱硝触媒、新品の脱硝触媒、再生前の脱硝触媒について計測した結果を示す。図8には、再生方法の実施例の触媒の触媒性能回復率の計測結果を示す。図9には、再生方法の実施例の触媒表面シリカ濃度の計測結果を示す。図10には、再生方法の実施例の触媒表面カルシウム濃度の計測結果を示す。
次に、1回の再生処理において、脱硝触媒を薬液に浸漬させる時間(処理時間:分)と脱硝触媒の触媒性能回復率(再生処理後の触媒性能/新品時の触媒性能:K/K0)、脱硝触媒の表面のシリカ濃度(質量%)、脱硝触媒の表面のカルシウム濃度(質量%)との関係を計測した。
計測結果を図11及び図12に示す。図11には、処理時間と触媒表面の付着物の濃度との関係の計測結果を示す。図12には、処理時間と脱硝触媒の性能回復率との関係の計測結果を示す。図11及び図12に示すように、処理時間を15分以上とすることで、カルシウムの濃度を低く維持しつつ、脱硝触媒の性能回復率を0.8、つまり新品の80%以上に回復するできることがわかった。また、処理時間を60分以下とすることで、処理時間が長くなることを抑制することができる。また、触媒に含まれるガラス繊維の溶出を抑制でき、触媒の強度低下を抑制できることがわかった。以上より、処理時間を15分以上60分以下とすることで、処理時間が長くなりすぎることを抑制し、触媒表面シリカ濃度を6質量%以下となることにより、脱硝触媒の性能回復率を高くできることがわかった。
次に、薬液を繰り返し使用し、使用回数と脱硝触媒の触媒性能回復率(再生処理後の触媒性能/新品時の触媒性能:K/K0)との関係を計測した。繰り返し薬液を利用する場合も、使用するごとに前回の再生処理によって反応した分に相当する量の無機酸及びフッ素化物を追加した。実施例10では、無機酸としてスルファミン酸を3.5質量%、界面活性剤として実施例8と同じリン酸エステルを0.05質量%、フッ素化合物としてフッ化水素アンモニウムをフッ化水素分が1質量%となる割合で混合した薬液を用いた。実施例11では、実施例10と同じ薬液を用い、使用するごとに追加する無機酸及びフッ素化合物の量を2倍とした。実施例12では、無機酸として塩酸を0.8質量%、無機酸としてホウ酸を0.15質量%、フッ素化合物としてフッ化水素アンモニウムをフッ化水素分が0.9質量%となる割合で混合した薬液を用いた。
計測結果を図13に示す。図13には、実施例10から実施例12について、薬液の使用回数と脱硝触媒の触媒性能回復率との関係の計測結果を示す。図13に示すように、薬液を繰り返し使用しても、触媒性能を同じ程度まで回復できることがわかった。従って、薬液の使用量及び廃棄量の低減が可能であることがわかった。
次に、実機スケールにて、界面活性剤を含有した薬液を用い、成分を変化させた複数の仕上げ洗浄液で脱硝触媒の再生方法を繰り返し実施し、洗浄液の繰返し使用回数と脱硝触媒の触媒性能回復率(再生処理後の触媒性能/新品時の触媒性能)との関係を計測した。実施例13では、仕上げ洗浄液としてスルファミン酸0.5mоl/lとなるように調製した洗浄液を用いた。また、実施例13では、薬液として実施例10と同様の薬液を用いた。実施例14では、仕上げ洗浄液としてスルファミン酸1mоl/lとなるように調製した洗浄液を用いた。また、実施例14では、無機酸としてスルファミン酸を5.3質量%、界面活性剤としてリン酸エステルを0.075質量%、フッ素化合物としてフッ化水素アンモニウムをフッ化水素分が1.5質量%となる割合で混合した薬液を用いた。
計測結果を図14A及び図14Bに示す。図14Aには、実施例13について、洗浄液を2回と8回繰り返し使用した場合の触媒性能回復率を、仕上げ洗浄液を水とした場合を1として示す。図14Bには、実施例13及び実施例14について、洗浄液を1回と5回繰り返し使用した場合の脱硝触媒の触媒性能回復率を示す。図14Aに示すように、スルファミン酸を含有する実施例13の方が、仕上げ洗浄液を水のみとした場合よりも、洗浄液を2回繰り返し使用しても脱硝触媒の性能回復を15%以上高くでき、洗浄液を8回繰り返し使用しても脱硝触媒の性能回復率を10%以上高く維持できることがわかった。また、図14Bに示すように、スルファミン酸1mоl/lを含有する実施例14で、洗浄液を5回繰り返し使用しても、実施例13と同程度の触媒性能回復率を維持できることがわかった。結果より、仕上げ洗浄液中のスルファミン酸の濃度が少なくとも0.5mоlであれば、洗浄液を繰り返し使用したとしても、脱硝触媒の触媒性能回復率を高く維持できることがわかった。
次に、ラボスケールにて、界面活性剤を変化させた複数の薬液(洗浄剤)を用いて脱硝触媒の再生方法を実施し、それぞれの薬液を用いた場合の脱硝触媒の圧壊強度と性能回復率を計測した。脱硝触媒として、実機発電プラントで50,000時間脱硝処理した後の脱硝触媒を供試試料とした。また、脱硝触媒は、二酸化チタン(TiO2)を主成分として、これに五酸化バナジウム(V2O5)と酸化タングステン(WO3)とを担持させたハニカム触媒とした。
実施例15では、スルファミン酸を3.2質量%、ノニオン系界面活性剤としてポリオキシエチレンポリオキシプロピレングリコールを主成分とする市販の界面活性剤Aを0.05質量%、フッ化水素アンモニウムをフッ化水素分が1.75質量%となる割合で混合した薬液を用いた。実施例16では、塩酸を2.4質量%、ホウ酸を0.15質量%、ノニオン系界面活性剤として界面活性剤Aを0.05質量%、フッ化水素アンモニウムをフッ化水素分が1.26質量%となる割合で混合した薬液を用いた。実施例17では、塩酸を2.4質量%、ホウ酸を0.15質量%、ノニオン系界面活性剤としてポリアルキレングリコール誘導体を主成分とする市販の界面活性剤Bを0.05質量%、フッ化水素アンモニウムをフッ化水素分が1.26質量%となる割合で混合した薬液を用いた。実施例18では、塩酸を2.4質量%、ホウ酸を0.15質量%、アニオン系界面活性剤としてポリオキシエチレンアルキル(C8)エーテルリン酸エステル・モノエタノールアミン塩を主成分とする市販の界面活性剤Cを0.05質量%、フッ化水素アンモニウムをフッ化水素分が1.26質量%となる割合で混合した薬液を用いた。
各触媒の触媒性能について、管式流通反応試験装置を用いて下記表1に示す性状のガスで計測した。
洗浄処理後の各触媒について、木屋式硬度計により圧壊強度を下記表2の要領で計測した。表2に示すように、触媒の壁方向の圧壊強度の値については、それぞれ5個の同様の触媒を準備して圧壊強度を計測し、それらの平均値(N/cm2)とした。触媒の壁方向の圧壊強度は、ハニカム形状の触媒のうちの流通孔のない壁面側から圧縮した強度とした。
計測結果を下記表3に示す。また、表中には、参照例として、上記洗浄処理を実施する前の使用済触媒(未洗浄触媒)の壁方向圧壊強度および触媒性能回復率を表中に示す。
次に、同一の薬液と同一の仕上げ洗浄液を用いて脱硝触媒の再生方法を繰り返し実施し、洗浄液の使用回数と脱硝触媒の触媒性能回復率(K/K0)との関係を計測した。実施例19では、仕上げ洗浄液として実施例14と同様の仕上げ洗浄液を用い、実施例15と同様の薬液を用いた。
計測結果を図15A及び図15Bに示す。図15Aには、実施例19について、洗浄液を1回と5回繰り返し使用した脱硝触媒の触媒性能回復率を、仕上げ洗浄液を水とした場合を1として示す。図15Bには、実施例19について、洗浄液の使用回数と脱硝触媒の触媒性能回復率との関係を示す。図15Aに示すように、スルファミン酸を含有する実施例19の方が、仕上げ洗浄液を水のみとした場合と比較して、洗浄液を5回繰り返し使用しても、脱硝触媒の触媒性能回復率を5%以上高くできることがわかった。また、図15Bに示すように、測定数値に誤差があるものの、洗浄液を3回繰り返し使用しても、脱硝触媒の触媒性能回復率を90%以上まで高く維持でき、洗浄液を6回繰り返し使用しても、脱硝触媒の触媒性能回復率を90%程度まで高く維持できることがわかった。
50:脱硝設備
82a、84a、86a:脱硝触媒
100、100a:脱硝触媒の再生システム
102、102a:予洗い部
104、104a:薬液洗浄部
106、106a:仕上げ洗い部
108、108a:乾燥部
112:触媒搬送装置
114:予備水洗槽
116:水供給装置
118:真空引き槽
120:真空ポンプ
122:薬洗槽
130:仕上げ水洗槽
Claims (16)
- 脱硝触媒を水洗いする予洗いステップと、
水洗いをした前記脱硝触媒を無機酸とフッ素化合物とを含む薬液に浸漬させる薬液洗浄ステップと、
前記薬液から前記脱硝触媒を取り出すステップと、
前記薬液から取り出した前記脱硝触媒を、水又はスルファミン酸含有水を仕上げ洗浄液として洗う仕上げ洗いステップと
を含む脱硝触媒の再生方法。 - 前記薬液は、界面活性剤をさらに含み、
前記界面活性剤は、ノニオン系界面活性剤またはアニオン系界面活性剤である請求項1に記載の脱硝触媒の再生方法。 - 前記ノニオン系界面活性剤は、ポリオキシエチレンポリオキシプロピレングリコール、ポリオキシエチレン誘導体またはポリアルキレングリコール誘導体を主成分とする界面活性剤である請求項2に記載の脱硝触媒の再生方法。
- 前記アニオン系界面活性剤は、ポリオキシアルキレンアルキルエーテルリン酸エステルを主成分とする界面活性剤である請求項2に記載の脱硝触媒の再生方法。
- 前記無機酸は、塩酸を含む、または塩酸及びホウ酸を含む請求項1~4のいずれか一項に記載の脱硝触媒の再生方法。
- 前記無機酸は、スルファミン酸を含む請求項1~4のいずれか一項に記載の脱硝触媒の再生方法。
- 前記脱硝触媒再生後の表面シリカ濃度を6質量%以下にする請求項1~6のいずれか一項に記載の脱硝触媒の再生方法。
- 前記予洗いステップでは、前記脱硝触媒を水槽内の水に浸漬させ、前記水槽を密閉して前記水槽内の空気を吸引する請求項1~7のいずれか一項に記載の脱硝触媒の再生方法。
- 前記薬液洗浄ステップでは、前記薬液を繰り返し使用する請求項1~8のいずれか一項に記載の脱硝触媒の再生方法。
- 脱硝触媒を水洗いする予洗い部と、
水洗いをした前記脱硝触媒を無機酸とフッ素化合物とを含む薬液に浸漬させる薬液洗浄部と、
前記薬液から取り出した前記脱硝触媒を、水又はスルファミン酸含有水を仕上げ洗浄液として仕上げ洗いする仕上げ洗い部と
を備える脱硝触媒の再生システム。 - 石炭焚きボイラ用の劣化した脱硝触媒を洗浄する洗浄剤であって、無機酸とフッ素化合物とを含有する水溶液を含む洗浄剤。
- 界面活性剤をさらに含み、
前記界面活性剤は、ノニオン系界面活性剤またはアニオン系界面活性剤である請求項11に記載の洗浄剤。 - 前記ノニオン系界面活性剤は、ポリオキシエチレンポリオキシプロピレングリコール、ポリオキシエチレン誘導体またはポリアルキレングリコール誘導体を主成分とする界面活性剤である請求項12に記載の洗浄剤。
- 前記アニオン系界面活性剤は、ポリオキシアルキレンアルキルエーテルリン酸エステルを主成分とする界面活性剤である請求項12に記載の洗浄剤。
- 前記無機酸は、塩酸を含む、または塩酸及びホウ酸を含む請求項11~14のいずれか一項に記載の洗浄剤。
- 前記無機酸は、スルファミン酸を含む請求項11~14のいずれか一項に記載の洗浄剤。
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JP2019010635A (ja) * | 2017-06-30 | 2019-01-24 | 三菱日立パワーシステムズ株式会社 | 脱硝触媒の再生方法及び脱硝触媒の再生システム |
JP7013258B2 (ja) | 2017-06-30 | 2022-01-31 | 三菱パワー株式会社 | 脱硝触媒の再生方法及び脱硝触媒の再生システム |
WO2020194851A1 (ja) * | 2019-03-28 | 2020-10-01 | 三菱日立パワーシステムズ株式会社 | 脱硝触媒の再生方法及び脱硝触媒の再生システム |
JP2020163242A (ja) * | 2019-03-28 | 2020-10-08 | 三菱日立パワーシステムズ株式会社 | 脱硝触媒の再生方法及び脱硝触媒の再生システム |
WO2021261477A1 (ja) * | 2020-06-24 | 2021-12-30 | 三菱パワー株式会社 | 触媒の再生方法、触媒の再生装置及びプログラム |
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CN107921420A (zh) | 2018-04-17 |
JP6298579B2 (ja) | 2018-03-20 |
KR20180017103A (ko) | 2018-02-20 |
TW201716138A (zh) | 2017-05-16 |
US20180185834A1 (en) | 2018-07-05 |
US11045799B2 (en) | 2021-06-29 |
JPWO2017010402A1 (ja) | 2017-08-31 |
KR102112426B1 (ko) | 2020-05-19 |
TWI640360B (zh) | 2018-11-11 |
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