CN108579408A - A kind of low-temperature catalyzed denitration method for flue gas - Google Patents
A kind of low-temperature catalyzed denitration method for flue gas Download PDFInfo
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- CN108579408A CN108579408A CN201810292954.2A CN201810292954A CN108579408A CN 108579408 A CN108579408 A CN 108579408A CN 201810292954 A CN201810292954 A CN 201810292954A CN 108579408 A CN108579408 A CN 108579408A
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- flue gas
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- alkali metal
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- 238000000034 method Methods 0.000 title claims abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000003546 flue gas Substances 0.000 title claims abstract description 29
- 239000003054 catalyst Substances 0.000 claims abstract description 52
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 15
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims abstract description 11
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims abstract description 11
- 239000011787 zinc oxide Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 31
- -1 nickel sulfate zinc oxide alkali metal Chemical class 0.000 claims description 20
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical group [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 229920001778 nylon Polymers 0.000 claims description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 238000002203 pretreatment Methods 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 10
- 239000002608 ionic liquid Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000003517 fume Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920000571 Nylon 11 Polymers 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims 2
- 229910052783 alkali metal Inorganic materials 0.000 claims 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 239000005864 Sulphur Substances 0.000 claims 1
- 150000001340 alkali metals Chemical class 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 150000002500 ions Chemical class 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 239000004744 fabric Substances 0.000 abstract description 8
- 231100000572 poisoning Toxicity 0.000 abstract description 4
- 230000000607 poisoning effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 23
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/80—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with zinc, cadmium or mercury
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
- B01J37/344—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electromagnetic wave energy
- B01J37/346—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electromagnetic wave energy of microwave energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Plasma & Fusion (AREA)
- Toxicology (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a kind of low temperature catalyst denitration method for flue gas, nickel sulfate, zinc oxide, alkali metal hydroxide are used first as primary raw material and are introduced complex carrier and be prepared into low temperature catalyst, afterwards after the preposition low-temperature plasma generator of denitrification apparatus carries out low-temperature plasma processing flue gas, grey mode is set low through deduster cloth again, denitrating flue gas is carried out finally by the processing of denitrification apparatus；Compared with prior art, it has the following advantages：Suitable for low grey arrangement, it is suitable for low temperature extension denitration, there is higher denitration efficiency under cryogenic, it is not easy to causes catalyst poisoning to block, have excellent catalytic activity, environmental-friendly degree high, it is not easy to generate secondary pollution.
Description
Technical field
The present invention relates to denitration method for flue gas field more particularly to a kind of low-temperature catalyzed denitration method for flue gas.
Background technology
Nitrogen oxides includes multiple compounds, but main component is nitric oxide and nitrogen dioxide.Human activity discharge
Oxynitrides is mainly caused by fuel combustion and chemical industry production, such as thermal power plant, chemical plant, steel mill
Occurring source is moved etc. fixation occurring source and motor vehicle for having fuel combustion etc..In addition, industrial processes and resident living also can
Generate a small amount of oxynitrides.Oxynitrides not only has a very strong toxic action to human body and animals and plants, or formed acid rain,
The main reason for haze and photochemical fog, also participates in the destruction of ozone layer.Control and the pollution for administering nitrogen oxides are always
The research hotspot in International Environmental Protection field, at present the nitrogen oxides control method of document report mainly selective catalytic reduction method,
Absorption method and absorption process etc., control stationary source nitrogen oxides pollution it is most effective, it is most widely used be SCR denitration technology.
In SCR denitration technology, since industrial stationary source generally uses high ash more than, it is be easy to cause catalyst poisoning, is blocked
Deng, service life is shortened, therefore develop the worth research of low temperature catalyst for being suitable for low grey arrangement, it is existing common
Titanium dioxide is that the catalyst of carrier is being generally not no denitration effect less than 300 DEG C.
Therefore, new material, structure and environmentally friendly low temperature catalyst, and corresponding denitrating flue gas side are developed
Method, makes that it is suitable under the system of low grey arrangement there is excellent denitration efficiency to be worth research.
Invention content
Goal of the invention：In order to solve the problems of in the prior art, the present invention proposes a kind of low-temperature catalyzed flue gas
Method of denitration, fitting has higher denitration efficiency and denitration effect, it is not easy to catalyst poisoning be caused to block.
Technical solution：To achieve these objectives, the present invention takes following technical scheme：A kind of low-temperature catalyzed denitrating flue gas side
Method includes the following steps：
(1) preparation of low temperature catalyst：By nickel sulfate, zinc oxide, alkali metal hydroxide merging microwave radiation reaction dress
In setting, setting microwave power is 200-300W, and adjusting pH is 6-7, reacts 4-6min, obtains nickel sulfate zinc oxide alkali metal
Hydroxide compound mixture；By silica, nylon fiber, recessed soil with 3:1:3 mass ratio merging microwave radiation reaction dress
In setting, setting microwave power is 150-200W, and adjusting pH is 6-7, reacts 7-9min, obtains complex carrier；By the compound load of step
In body, nickel sulfate zinc oxide alkali metal hydroxide compound mixture merging supercritical reaction kettle, Vltrasonic device, control are opened
Temperature processed is 120-180 DEG C, pressure 6-10MPa, is entered after ionic liquid is pressurizeed by high-pressure pump after reaction 18-20min anti-
It answers in kettle, the reaction was continued 5-12min；It opens pressure relief opening and the pressure in supercritical reaction kettle is dropped into normal pressure, obtain powder；It will receive
Absolute ethyl alcohol is added in the powder of collection, and 350-450 DEG C of evaporation drying 1.5-2.5h is carried out in Rotary Evaporators and obtains catalyst
Head product；Composite catalyst head product is calcined into 1-2h at 900-1100 DEG C, obtains required catalyst；
(2) denitration pre-treatment 1：Low-temperature plasma generator is set in denitrification apparatus front end, pending flue gas enters
After low-temperature plasma generator, temperature setting is 10-15 DEG C；Gas flow is set as 300-400mL/min；React 3-
It is handled into next device after 8min；
(3) denitration pre-treatment 2：Double dust collection arranged side by side is set before denitrification apparatus, after low-temperature plasma generator
Device carries out low ash arrangement；
(4) denitration process：Using SCR methods, denitrification reducing agent is prepared with liquefied ammonia, every stove arranges a SCR reactor,
Denitrification apparatus is designed according to 100% fume treatment at full capacity, the low temperature catalyst prepared using step (1)；By " 2+1 " pattern cloth
Three layers of catalyst are set, denitrification apparatus main design parameters are：Unit load 500MW；100-200 DEG C of temperature；Smoke moisture 10%.
More preferably, nickel sulfate described in step (1), zinc oxide, alkali metal hydroxide mass ratio be 3:2:1.
Further, alkali metal hydroxide described in step (1) is potassium hydroxide.
More preferably, nylon fiber described in step (1) is nylon 11 or nylon 22.
More preferably, ionic liquid described in step (1) is alkyl quaternaries compound ions liquid.
More preferably, complex carrier, nickel sulfate zinc oxide alkali metal hydroxide described in step (1) are compound mixed
The mass ratio for closing object is 4:1.
More preferably, the additive amount of absolute ethyl alcohol described in step (1) is 2-3 times of powder volume.
More preferably, double dust collection device described in step (3) is bag filter.
More preferably, the specific surface area of low temperature catalyst described in step (4) is 350-450m2/m3。
Advantageous effect：A kind of low-temperature catalyzed denitration method for flue gas provided by the invention has following compared with prior art
Advantage：Suitable for low grey arrangement, it is suitable for low temperature extension denitration, there is higher denitration efficiency under cryogenic, no
It is be easy to cause catalyst poisoning blocking, has excellent catalytic activity, environmental-friendly degree high, it is not easy to generate secondary pollution.
Specific implementation mode
Embodiment 1：
A kind of low-temperature catalyzed denitration method for flue gas, includes the following steps：
(1) preparation of low temperature catalyst：By nickel sulfate, zinc oxide, alkali metal hydroxide merging microwave radiation reaction dress
In setting, setting microwave power is 200W, and it is 6 to adjust pH, reacts 4min, obtains nickel sulfate zinc oxide alkali metal hydroxide
Compound mixture；By silica, nylon fiber, recessed soil with 3:1:In 3 mass ratio merging microwave radiation reaction unit, setting
Microwave power is 150W, and it is 6 to adjust pH, reacts 7min, obtains complex carrier；Step complex carrier, nickel sulfate are aoxidized
Zinc alkali metal hydroxide compound mixture is placed in supercritical reaction kettle, opens Vltrasonic device, controlled at 120- DEG C,
Pressure is 6MPa, reacts and enters in reaction kettle after ionic liquid being pressurizeed by high-pressure pump after 20min, the reaction was continued 12min；It beats
It opens pressure relief opening and the pressure in supercritical reaction kettle is dropped into normal pressure, obtain powder；Absolute ethyl alcohol is added in the powder of collection, is being revolved
Turn to carry out 350 DEG C of evaporation drying 2.5h in evaporimeter and obtains catalyst head product；By composite catalyst head product at 900 DEG C
Lower calcining 2h, obtains low temperature catalyst；
Wherein, the nickel sulfate, zinc oxide, alkali metal hydroxide mass ratio be 3:2:1；The alkali metal hydroxide
Object is potassium hydroxide；The nylon fiber is nylon 11；The ionic liquid is alkyl quaternaries compound ions liquid
Body；The complex carrier, nickel sulfate zinc oxide alkali metal hydroxide compound mixture mass ratio be 4:1；The nothing
The additive amount of water-ethanol is 2-3 times of powder volume.
(2) denitration pre-treatment 1：Low-temperature plasma generator is set in denitrification apparatus front end, pending flue gas enters
After low-temperature plasma generator, temperature setting is 10-15 DEG C；Gas flow is set as 300-400mL/min；React 3-
It is handled into next device after 8min；
(3) denitration pre-treatment 2：Before denitrification apparatus, double cloth bags arranged side by side are set after low-temperature plasma generator
Deduster carries out low ash arrangement；
(4) denitration process：Using SCR methods, denitrification reducing agent is prepared with liquefied ammonia, every stove arranges a SCR reactor,
Denitrification apparatus is designed according to 100% fume treatment at full capacity, the low temperature catalyst prepared using step (1)；By " 2+1 " pattern cloth
Three layers of catalyst are set, denitrification apparatus main design parameters are：Unit load 500MW；100-200 DEG C of temperature；Smoke moisture 10%；
The specific surface area of the low temperature catalyst is 350-450m2/m3。
Embodiment 2：
A kind of low-temperature catalyzed denitration method for flue gas, includes the following steps：
(1) preparation of low temperature catalyst：By nickel sulfate, zinc oxide, alkali metal hydroxide merging microwave radiation reaction dress
In setting, setting microwave power is 300W, and it is 7 to adjust pH, reacts 6min, obtains nickel sulfate zinc oxide alkali metal hydroxide
Compound mixture；By silica, nylon fiber, recessed soil with 3:1:In 3 mass ratio merging microwave radiation reaction unit, setting
Microwave power is 200W, and it is 7 to adjust pH, reacts 9min, obtains complex carrier；By complex carrier, nickel sulfate zinc oxide alkali
Metal hydroxides compound mixture is placed in supercritical reaction kettle, opens Vltrasonic device, and controlled at 180 DEG C, pressure is
10MPa reacts and enters in reaction kettle after ionic liquid being pressurizeed by high-pressure pump after 20min, the reaction was continued 12min；Open pressure release
Pressure in supercritical reaction kettle is dropped to normal pressure by mouth, obtains powder；Absolute ethyl alcohol is added in the powder of collection, in rotary evaporation
450 DEG C of evaporation drying 1.5h is carried out in instrument obtains catalyst head product；Composite catalyst head product is calcined at 900 DEG C
1h obtains low temperature catalyst.
Wherein, the nickel sulfate, zinc oxide, alkali metal hydroxide mass ratio be 3:2:1；The alkali metal hydroxide
Object is potassium hydroxide；The nylon fiber is nylon 22；Ionic liquid is alkyl quaternaries compound ions liquid；
The complex carrier, nickel sulfate zinc oxide alkali metal hydroxide compound mixture mass ratio be 4:1；The anhydrous second
The additive amount of alcohol is 2-3 times of powder volume.
(2) denitration pre-treatment 1：Low-temperature plasma generator is set in denitrification apparatus front end, pending flue gas enters
After low-temperature plasma generator, temperature setting is 10-15 DEG C；Gas flow is set as 300-400mL/min；React 3-
It is handled into next device after 8min；
(3) denitration pre-treatment 2：Before denitrification apparatus, double cloth bags arranged side by side are set after low-temperature plasma generator
Deduster carries out low ash arrangement；
(4) denitration process：Using SCR methods, denitrification reducing agent is prepared with liquefied ammonia, every stove arranges a SCR reactor,
Denitrification apparatus is designed according to 100% fume treatment at full capacity, the low temperature catalyst prepared using step (1)；By " 2+1 " pattern cloth
Three layers of catalyst are set, denitrification apparatus main design parameters are：Unit load 500MW；100-200 DEG C of temperature；Smoke moisture 10%；
The specific surface area of the low temperature catalyst is 350-450m2/m3。
Embodiment 3：
A kind of low-temperature catalyzed denitration method for flue gas, includes the following steps：
(1) preparation of low temperature catalyst：By nickel sulfate, zinc oxide, alkali metal hydroxide merging microwave radiation reaction dress
In setting, it is 6.5 that setting microwave power, which is 250 adjusting pH,；5min is reacted, nickel sulfate zinc oxide alkali metal hydroxide is obtained
Compound mixture；By silica, nylon fiber, recessed soil with 3:1:In 3 mass ratio merging microwave radiation reaction unit, setting
Microwave power is 175W, and it is 6.5 to adjust pH, reacts 8min, obtains complex carrier；By complex carrier, nickel sulfate zinc oxide
Alkali metal hydroxide compound mixture is placed in supercritical reaction kettle, opens Vltrasonic device, controlled at 150 DEG C, pressure
For 8MPa, reacts and enter in reaction kettle after ionic liquid being pressurizeed by high-pressure pump after 19min, the reaction was continued 8min；Open pressure release
Pressure in supercritical reaction kettle is dropped to normal pressure by mouth, obtains powder；Composite catalyst head product is calcined at 1000 DEG C
1.5h obtains low temperature catalyst；
Wherein, the nickel sulfate, zinc oxide, alkali metal hydroxide mass ratio be 3:2:1；The alkali metal hydroxide
Object is potassium hydroxide；The nylon fiber is nylon 11；The ionic liquid is alkyl quaternaries compound ions liquid
Body；The complex carrier, nickel sulfate zinc oxide alkali metal hydroxide compound mixture mass ratio be 4:1；The nothing
The additive amount of water-ethanol is 2-3 times of powder volume.
(2) denitration pre-treatment 1：Low-temperature plasma generator is set in denitrification apparatus front end, pending flue gas enters
After low-temperature plasma generator, temperature setting is 10-15 DEG C；Gas flow is set as 300-400mL/min；React 3-
It is handled into next device after 8min；
(3) denitration pre-treatment 2：Before denitrification apparatus, double cloth bags arranged side by side are set after low-temperature plasma generator
Deduster carries out low ash arrangement；
(4) denitration process：Using SCR methods, denitrification reducing agent is prepared with liquefied ammonia, every stove arranges a SCR reactor,
Denitrification apparatus is designed according to 100% fume treatment at full capacity, the low temperature catalyst prepared using step (1)；By " 2+1 " pattern cloth
Three layers of catalyst are set, denitrification apparatus main design parameters are：Unit load 500MW；100-200 DEG C of temperature；Smoke moisture 10%；
The specific surface area of the low temperature catalyst is 350-450m2/m3。
To 3 gathered data of embodiment 1- embodiments, denitration efficiency is calculated, calculation formula is as follows：
Denitration efficiency=(reactor inlet nitrogen oxide mass concentration-reactor inlet nitrogen oxide mass concentration)/anti-
Answer device inlet nitrogen oxides mass concentration；
2) test result：
1 embodiment 1-3 of table is compared with comparative example denitration efficiency
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| Denitration efficiency | 0.96 | 0.96 | 0.95 |
As it can be seen from table 1 a kind of denitration efficiency of low-temperature catalyzed denitration method for flue gas of the present invention has excellent up to 0.96
Different denitration effect.
It should be pointed out that for those skilled in the art, without departing from the principle of the present invention,
It can also make several improvements, these improvement also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of low temperature catalyst denitration method for flue gas, it is characterised in that include the following steps：
(1) preparation of low temperature catalyst：Nickel sulfate, zinc oxide, alkali metal hydroxide are placed in microwave radiation reaction unit,
Setting microwave power is 200-300W, and adjusting pH is 6-7, reacts 4-6min, obtains nickel sulfate zinc oxide alkali metal hydrogen-oxygen
Compound compound mixture；By silica, nylon fiber, recessed soil with 3:1:In 3 mass ratio merging microwave radiation reaction unit,
Setting microwave power is 150-200W, and adjusting pH is 6-7, reacts 7-9min, obtains complex carrier；By step complex carrier, sulphur
In sour nickel zinc oxide alkali metal hydroxide compound mixture merging supercritical reaction kettle, Vltrasonic device, control temperature are opened
Degree is 120-180 DEG C, pressure 6-10MPa, enters reaction kettle after ionic liquid is pressurizeed by high-pressure pump after reaction 18-20min
In, the reaction was continued 5-12min；It opens pressure relief opening and the pressure in supercritical reaction kettle is dropped into normal pressure, obtain powder；By collection
Absolute ethyl alcohol is added in powder, and 350-450 DEG C of evaporation drying 1.5-2.5h is carried out in Rotary Evaporators and obtains catalyst primiparity
Object；Composite catalyst head product is calcined into 1-2h at 900-1100 DEG C, obtains required catalyst；
(2) denitration pre-treatment 1：Low-temperature plasma generator is set in denitrification apparatus front end, pending flue gas enters low temperature
After plasma generator, temperature setting is 10-15 DEG C；Gas flow is set as 300-400mL/min；It is laggard to react 3-8min
Enter next device to be handled；
(3) denitration pre-treatment 2：Double dust collection device arranged side by side is set before denitrification apparatus, after low-temperature plasma generator, into
The low ash arrangement of row；
(4) denitration process：Using SCR methods, denitrification reducing agent is prepared with liquefied ammonia, every stove arranges a SCR reactor, according to full
100% fume treatment of load designs denitrification apparatus, the low temperature catalyst prepared using step (1)；By three layers of " 2+1 " mode arrangement
Catalyst, denitrification apparatus main design parameters are：Unit load 500MW；100-200 DEG C of temperature；Smoke moisture 10%.
2. low temperature catalyst denitration method for flue gas according to claim 1, it is characterised in that：Sulfuric acid described in step (1)
Nickel, zinc oxide, alkali metal hydroxide mass ratio be 3:2:1.
3. low temperature catalyst denitration method for flue gas as claimed in claim 2, it is characterised in that：Alkali metal described in step (1)
Hydroxide is potassium hydroxide.
4. low temperature catalyst denitration method for flue gas according to claim 1, it is characterised in that：Nylon described in step (1)
Fiber is nylon 11 or nylon 22.
5. low temperature catalyst denitration method for flue gas according to claim 1, it is characterised in that：Ion described in step (1)
Liquid is alkyl quaternaries compound ions liquid.
6. low temperature catalyst denitration method for flue gas according to claim 1, it is characterised in that：It is compound described in step (1)
Carrier, nickel sulfate zinc oxide alkali metal hydroxide compound mixture mass ratio be 4:1.
7. low temperature catalyst denitration method for flue gas according to claim 1, it is characterised in that：It is anhydrous described in step (1)
The additive amount of ethyl alcohol is 2-3 times of powder volume.
8. low temperature catalyst denitration method for flue gas according to claim 1, it is characterised in that：It is double described in step (3) to remove
Dirt device is bag filter.
9. low temperature catalyst denitration method for flue gas according to claim 1, it is characterised in that：Low temperature described in step (4)
The specific surface area of catalyst is 350-450m2/m3。
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