CN114713021A - Composite desulfurization and denitrification agent for power plant flue gas purification and preparation method thereof - Google Patents
Composite desulfurization and denitrification agent for power plant flue gas purification and preparation method thereof Download PDFInfo
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- CN114713021A CN114713021A CN202210489590.3A CN202210489590A CN114713021A CN 114713021 A CN114713021 A CN 114713021A CN 202210489590 A CN202210489590 A CN 202210489590A CN 114713021 A CN114713021 A CN 114713021A
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- desulfurization
- flue gas
- denitrification agent
- denitrification
- power plant
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 72
- 230000023556 desulfurization Effects 0.000 title claims abstract description 72
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 50
- 239000003546 flue gas Substances 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 35
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 238000000746 purification Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 229920000642 polymer Polymers 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000002195 synergetic effect Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 150000001412 amines Chemical class 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims description 16
- 229920002554 vinyl polymer Polymers 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 5
- 239000011118 polyvinyl acetate Substances 0.000 claims description 5
- 150000001408 amides Chemical class 0.000 claims description 4
- FNAQSUUGMSOBHW-UHFFFAOYSA-H calcium citrate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FNAQSUUGMSOBHW-UHFFFAOYSA-H 0.000 claims description 4
- 239000001354 calcium citrate Substances 0.000 claims description 4
- 150000002466 imines Chemical class 0.000 claims description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011736 potassium bicarbonate Substances 0.000 claims description 4
- 235000015497 potassium bicarbonate Nutrition 0.000 claims description 4
- 229910000028 potassium bicarbonate Inorganic materials 0.000 claims description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 235000013337 tricalcium citrate Nutrition 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group 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 claims description 3
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical group NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 3
- GEYXPJBPASPPLI-UHFFFAOYSA-N manganese(III) oxide Inorganic materials O=[Mn]O[Mn]=O GEYXPJBPASPPLI-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- QYHKLBKLFBZGAI-UHFFFAOYSA-N boron magnesium Chemical compound [B].[Mg] QYHKLBKLFBZGAI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 2
- 239000000391 magnesium silicate Substances 0.000 claims description 2
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 2
- 235000019792 magnesium silicate Nutrition 0.000 claims description 2
- 238000013021 overheating Methods 0.000 claims description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 2
- 235000011181 potassium carbonates Nutrition 0.000 claims description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 2
- 235000011151 potassium sulphates Nutrition 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 abstract description 9
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 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
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- B01D53/81—Solid phase processes
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a composite desulfurization and denitrification agent for power plant flue gas purification and a preparation method thereof. The composite desulfurization and denitrification agent comprises the following components in parts by mass: 10.0-49.0 parts of a high-molecular desulfurization and denitrification agent, 5.0-10.0 parts of a synergistic high-molecular polymer, 20-40 parts of an alkaline substance and 0-10.0 parts of an auxiliary agent, wherein the high-molecular desulfurization and denitrification agent is an ammonium and/or amine source. Sleeving a water-cooling jacket on the outer part of the high-speed mixer, putting all the components into the high-speed mixer, quickly stirring and mixing, generating heat in the mixing process, feeding back the circulating water and the stirring rotating speed in the water-cooling jacket together in the reaction process, controlling the reaction temperature at 60-80 ℃, and carrying out mixed reaction for 10-20 min. The composite desulfurization and denitrification agent can be used for simultaneously desulfurizing and denitrifying flue gas, can also be used for independently denitrifying or desulfurizing flue gas, has higher desulfurization and denitrification rate, and has the denitrification rate of 80.6-99% under the conditions of 800 and 1050 ℃, and the desulfurization efficiency of more than 90%.
Description
Technical Field
The invention belongs to the technical field of power plant flue gas purification, and particularly relates to a composite desulfurization and denitrification agent for power plant flue gas purification and a preparation method thereof.
Background
SO2And NOxPhotochemical smog can be formed, the health and life of human beings are threatened, the national requirements on emission of smoke pollutants are stricter and stricter, the desulfurization and denitration processes are complex, the desulfurization needs a wet method, a large amount of wastewater and gypsum are generated and are difficult to treat, the denitration adopts an SCR (selective catalytic reduction) process, and the waste catalyst needs to be treated as hazardous waste. Therefore, a simplified desulfurization and denitrification process is urgently needed, pollutants are removed in one step, equipment investment and operation cost are reduced, and standard emission is realized.
Most of the research and patents at present aim at denitration, for example, patent CN106621782B introduces a polymer denitration agent, which is a powder product formed by compounding an ammonia source with a polymer material and an additive, and the denitration efficiency can reach more than 90% when the denitration reaction is performed at 1050 ℃ of 800-.
CN113731159A discloses a method for preparing calcium-based particle synchronous desulfurization and denitrification agent, which is prepared by mixing Ca (OH)2Biomass ash, KMnO4Diatomite, PEO (polyethylene oxide), alumina sol and MgSO4, a molding granulation line, mixing and kneading, further adding water into the raw materials in a kneader, mixing to form uniformly dispersed wet blank, drying to obtain dry blank, cooling and discharging to obtain the finished product, the finished product is used for desulfurization and denitrification, meets the environmental protection requirements, the preparation process is quite complex, and the cost of the raw materials is high,the price is difficult to bear.
The traditional desulfurization and denitrification process has complex system and high investment and operation cost, the existing desulfurization and denitrification agent has complex preparation process, and the finished product can be obtained only after mixing, drying and cooling, thereby causing high price.
Disclosure of Invention
The invention provides a composite desulfurization and denitrification agent for purifying flue gas of a power plant and a preparation method thereof, which can optimize preparation raw materials, simplify the preparation cost of the raw materials, reduce the operation cost and meet the requirement of NO in the flue gas x And SO2The integrated simultaneous removal ensures higher desulfurization and denitrification efficiency, meets the emission standard and simplifies the process route.
In order to solve the problems of the prior art, the invention adopts the technical scheme that:
the composite desulfurization and denitrification agent for power plant flue gas purification is characterized by comprising the following components in parts by mass: 10.0-49.0 parts of high-molecular desulfurization and denitrification agent, 5.0-10.0 parts of synergistic high-molecular polymer, 20-40 parts of alkaline substance and 1-10.0 parts of assistant, wherein the high-molecular desulfurization and denitrification agent is ammonium and/or amine source.
The improvement is that the high-molecular desulfurization and denitrification agent is dicyandiamide or imine.
The improvement is that the synergistic high molecular polymer is one or a mixture of two of polyvinyl acid salt polymer and polyvinyl amide polymer.
In a further improvement, the polyvinyl acetate polymer or the polyvinyl amide polymer is sodium polyvinyl acetate, polyvinyl potassium sulfate, vinyl acetate, or poly N-vinyl butyl lactam.
The improvement is that the alkaline substance is one or a mixture of more of calcium citrate, potassium carbonate, potassium bicarbonate, magnesium carbonate, boron magnesium silicate and aluminum oxide.
As an improvement, the auxiliary agent at least comprises the following SiO2Talc, sodium bicarbonate, or Mn2O3One of them.
According to the preparation method of the composite desulfurization and denitrification agent for power plant flue gas purification, the water cooling jacket is sleeved on the outer part of the high-speed mixer, all components are put into the high-speed mixer to be rapidly stirred and mixed, heat is generated in the mixing process, the circulating water and the stirring rotating speed in the water cooling jacket are fed back together in the reaction process, the reaction temperature is controlled to be 60-80 ℃, and the mixing reaction is carried out for 10-20 min.
The preparation method of the composite desulfurization and denitrification agent for power plant flue gas purification specifically comprises the following steps:
step 1, weighing a high-molecular desulfurization and denitrification agent, a synergistic high-molecular polymer, an alkaline substance and an auxiliary agent according to the mass;
step 2, placing the components weighed in the step 1 into a reactor of a high-speed mixer, starting circulating cooling water in a control cabinet, starting stirring, gradually increasing the rotating speed according to the temperature of the mixing reaction, controlling the stirring linear speed to be below 10m/s when the temperature of the mixing reaction is increased to 60 ℃, gradually reducing the stirring linear speed when the temperature exceeds 75 ℃ to ensure that the linear speed is greater than 5m/s, increasing the flow of the cooling water under the condition of reducing the stirring linear speed and not reducing the temperature to ensure that the temperature of materials in the reactor does not exceed 80 ℃, simultaneously ensuring that the raw materials are not hung on the wall due to overheating by the cooling water, controlling the temperature to be between 60 and 80 ℃ by using a PLC module in the whole mixing reaction process, stably running for 10 to 20min, then reducing the stirring linear speed to 1m/s, and after running for 2min, opening a discharge valve to discharge the materials, and (3) the raw materials enter a finished product bin, circulating water still runs in the unloading process, the frequency of a pump can be reduced by 30% -60% of the normal operation, and meanwhile, along with the gradual unloading of the raw materials in the mixing reactor, heat flow dust exists in the reactor, and the reactor wall is too low in temperature when meeting the situation, so that the reactor is easy to agglomerate and corrode. And secondly, the raw materials are continuously discharged, the amount of cooling water required is correspondingly reduced, and the frequency is reduced to further save energy.
The composite desulfurization and denitrification agent for power plant flue gas purification can be used for simultaneously desulfurizing and denitrifying flue gas, can also be used for independently denitrifying or desulfurizing, and has higher desulfurization and denitrification rate. The detection shows that the denitration rate reaches 80.6-99% and the desulfurization efficiency is more than 90% under the conditions of 800-.
Has the advantages that:
compared with the prior art, the composite desulfurization and denitrification agent for power plant flue gas purification and the preparation method thereof have the following specific advantages:
1. the raw materials used in the invention are common commercial raw materials, the materials are simple to obtain, the cost is low, and the efficient desulfurization and denitrification agent is generated through simple metering and complex reaction;
2. the preparation process is simple, the reaction can be directly cooled in the reactor after the reaction is finished, the cooling time is short, and the process flow is simple and convenient;
3. the composite desulfurization and denitrification agent for purifying the flue gas of the power plant can be used for simultaneously desulfurizing and denitrifying the flue gas, can also be used for singly denitrifying or desulfurizing the flue gas, has higher desulfurization and denitrification rate, is simple in industrial application process, directly adopts a pneumatic conveying process, and can meet the daily flue gas purification requirement. The detection shows that the denitration rate reaches 80.6-99% and the desulfurization efficiency is more than 90% under the conditions of 800-.
Drawings
FIG. 1 is a process flow of the preparation of the composite desulfurization and denitrification agent for power plant flue gas purification of the present invention.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The preparation of the composite desulfurization and denitrification agent for power plant flue gas purification is carried out according to the flow of fig. 1, and it is noted that the raw materials 1, 2 and 3 … … marked in the figure are raw material …, which indicates that various reactants can be selected from partial components such as a high molecular desulfurization and denitrification agent, a synergistic high molecular polymer, an alkaline substance, an auxiliary agent and the like, and the general meaning is shown here.
Example 1
Weighing 40 parts by mass of dicyandiamide (serving as a desulfurization and denitrification agent), 5 parts of sodium polyvinyl acetate (serving as a synergistic high-molecular polymer), 40 parts of calcium citrate (serving as an alkaline substance), 5 parts of sodium bicarbonate (serving as an alkaline substance), 5 parts of silica powder (serving as an auxiliary agent), 3 parts of aluminum oxide (serving as an auxiliary agent), 2 parts of Mn2O3(as an auxiliary agent) is put into a reactor, the reactor is operated for 10min at a linear speed of 8m/s, and the temperature is controlled to be 65-70 ℃ under normal working conditions. Then the stirring linear velocity is reduced to 1m/s, and after 2min of operation, a discharge valve is opened for discharging.
The performance of the desulfurization and denitrification agent is tested in a 2520 stainless steel reactor with the electric heating temperature of 850-. With NO and SO2Introducing a gas steel cylinder from the bottom of the reactor by adopting N2Diluting with inert gas atmosphere to remove NO and SO2The concentrations are controlled separately to the desired concentration ranges. The composite desulfurization and denitrification agent is added from the top of the reactor through a miniature spiral, and a Gasmet DX 4000 flue gas analyzer is adopted to analyze NO and SO at the outlet2Detecting the concentration of NO and SO at 880 deg.C2The concentration is stabilized at 400mg/m3，500mg/m3Adding composite desulfurizing and denitrifying agent, discharging stably after 3min, average NO concentration is 12 mg/m3Denitration rate as high as 97%, SO2The average concentration is 40mg/m3And the desulfurization efficiency is 92 percent.
Under the above conditions, the dinitrile amine is fed into the reactor separately according to the above feeding amount, and the NO concentration is 120mg/m on average3Denitration rate is only 70%, SO2The average concentration is 400mg/m3The desulfurization efficiency was 20%.
Under the conditions, calcium citrate and sodium bicarbonate (the mass ratio is 8: 1) are separately added into the reactor according to the feeding amount, and the concentration of NO is 320mg/m on average3Denitration rate is only 20%, SO2The average concentration is 120mg/m3And the desulfurization efficiency is 76%.
Engineering application test:
the compound desulfurization and denitrification agent is further produced in an enlarged way, four spray guns are arranged on the front wall of the top layer of a flue of a 300t/d waste incineration power plant, two spray guns are respectively arranged on the left side wall and the right side wall, and the smoke gas amount is 50000Nm3H, initial NOx concentration of 350mg/Nm3，SO2The initial concentration was 190 mg/Nm3. The composite desulfurization and denitrification agent is conveyed to a temperature window of a spray gun in a furnace by adopting a Roots blower as power and a pneumatic conveying method, the continuous operation is carried out for 6 hours, and the smoke is in smokeThe height of the chimney is 20 meters, Gasmet DX 4000 is adopted for detection, and the concentration range of NOx is 50-70mg/m3，SO2The concentration is 15-28mg/m3And the denitration efficiency exceeds 80 percent and the desulfurization efficiency is more than 85 percent.
Example 2
Weighing 50 parts by mass of imine (serving as desulfurization and denitrification), 6 parts of poly (N-vinyl butyl lactam) (serving as synergistic high molecular polymer), 35 parts of potassium bicarbonate (serving as alkaline substance), 5 parts of magnesium carbonate (serving as alkaline substance), 4 parts of talcum powder (serving as auxiliary agent), 2 parts of aluminum oxide (serving as auxiliary agent) and 2 parts of sodium bicarbonate (serving as auxiliary agent), putting the materials into a mixing reactor, operating at a linear speed of 10m/s for 16min, and controlling the temperature at 60-75 ℃. Then the stirring linear velocity is reduced to 1m/s, and after 2min of operation, a discharge valve is opened for discharging.
The performance of the desulfurization and denitrification agent is tested in a 2520 stainless steel reactor with the electric heating temperature of 850-. With NO and SO2Introducing a gas steel cylinder from the bottom of the reactor by adopting N2Diluting with inert gas atmosphere to remove NO and SO2The concentrations are controlled separately to the desired concentration ranges. The composite desulfurization and denitrification agent is added from the top of the reactor through a miniature spiral, a Gasmet DX 4000 flue gas analyzer is adopted for detection, the temperature is controlled to 870 ℃, and NO and SO are waited to be added2The concentration is stabilized at 380mg/m3And 400mg/m3Then adding the composite desulfurization and denitrification agent, discharging stably after 5min, and waiting for NO and SO2After the concentration is stabilized, the NO concentration is 0mg/m on average3Denitration rate up to 100%, SO2The average concentration is 20mg/m3The desulfurization efficiency was 95%.
Under the conditions, imine is added into the reactor according to the feeding amount, and the NO concentration is 100mg/m on average3The denitration rate is only 73.6 percent, and SO2Concentration average 280mg/m3The desulfurization efficiency was 30%.
Under the conditions, potassium bicarbonate and magnesium carbonate (the mass ratio is 7: 1) are separately added into the reactor according to the feeding amount, and the average NO concentration is 300mg/m3Denitration rate is only 21%, SO2The average concentration is 100mg/m3And the desulfurization efficiency is about 75 percent.
Engineering application test:
the composite desulfurization and denitrification agent is further produced in an enlarged way, six spray guns are arranged on the middle front wall of a flue of the biomass water-cooling vibration incinerator with the evaporation capacity of 130t/d, three spray guns are arranged on the left side wall and the right side wall respectively, and the smoke quantity is 170000Nm3H, initial concentration of NOx 400mg/Nm3，SO2The initial concentration was 210 mg/Nm3. The method adopts a Roots blower as power and a pneumatic transmission method for transmission, the continuous operation is carried out for 24 hours, the height of flue gas in a chimney is 20 meters, Gasmet DX 4000 is adopted for detection, and the concentration of NOx is 40-60 mg/m3Within the range of variation, the mean value being 52mg/Nm3，SO2The concentration is 15-40 mg/m3Fluctuated between, the average value is 32mg/m3. The denitration efficiency is up to 87 percent, and the desulfurization efficiency is about 85 percent.
Examples 1 and 2 regarding NO concentration and SO2The measurement of the concentration is directly read by a flue gas analyzer, and the calculation modes of the desulfurization and denitrification efficiency are removal efficiency = (initial concentration of pollutant-average emission concentration of pollutant)/initial concentration of pollutant by a conventional method.
The embodiment 1-2 shows that the raw materials used in the invention are common commercially available raw materials, the raw materials are simple to obtain, the cost is low, the efficient desulfurization and denitrification agent is generated through simple metering and complex reaction, the composite desulfurization and denitrification agent can be used for simultaneously desulfurizing and denitrifying flue gas, can also be used for independently denitrifying or desulfurizing flue gas, has higher desulfurization and denitrification rates, is simple in industrial application process, directly adopts a pneumatic conveying process, and can meet the daily flue gas purification requirements. The detection shows that the denitration rate reaches 80.6-99% and the desulfurization efficiency is more than 90% under the conditions of 800-.
Claims (8)
1. The composite desulfurization and denitrification agent for power plant flue gas purification is characterized by comprising the following components in parts by mass: 10.0-49.0 parts of a high-molecular desulfurization and denitrification agent, 5.0-10.0 parts of a synergistic high-molecular polymer, 20-40 parts of an alkaline substance and 1-10.0 parts of an auxiliary agent, wherein the high-molecular desulfurization and denitrification agent is an ammonium and/or amine source.
2. The composite desulfurization and denitrification agent for power plant flue gas purification according to claim 1, wherein the polymeric desulfurization and denitrification agent is dicyandiamide or imine.
3. The composite desulfurization and denitrification agent for power plant flue gas purification according to claim 1, wherein the synergistic high molecular polymer is one or a mixture of two of a polyvinyl acid salt polymer and a polyvinyl amide polymer.
4. The composite desulfurization and denitrification agent for power plant flue gas purification according to claim 3, wherein the polyvinyl acetate polymer or the polyvinyl amide polymer is sodium polyvinyl acetate, polyvinyl potassium sulfate, vinyl acetate, or poly N-vinyl butyl lactam.
5. The composite desulfurization and denitrification agent for power plant flue gas purification according to claim 1, wherein the alkaline substance is one or more of calcium citrate, potassium carbonate, potassium bicarbonate, magnesium carbonate, boron magnesium silicate and aluminum oxide.
6. The composite desulfurization and denitrification agent for power plant flue gas purification as claimed in claim 1, wherein the auxiliary agent at least comprises the following SiO2Talc, sodium bicarbonate, or Mn2O3Or one of them.
7. The preparation method of the composite desulfurization and denitrification agent for power plant flue gas purification, as recited in claim 1, is characterized in that a water-cooling jacket is sleeved on the outside of the high-speed mixer, the components are put into the high-speed mixer to be rapidly stirred and mixed, heat is generated in the mixing process, the reaction process depends on the feedback of circulating water and stirring rotation speed in the water-cooling jacket, the reaction temperature is controlled at 60-80 ℃, and the mixing reaction is carried out for 10-20 min.
8. The preparation method of the composite desulfurization and denitrification agent for power plant flue gas purification according to claim 7, is characterized by comprising the following steps:
step 1, weighing a high-molecular desulfurization and denitrification agent, a synergistic high-molecular polymer, an alkaline substance and an auxiliary agent according to mass;
step 2, placing the components weighed in the step 1 into a reactor of a high-speed mixer, starting circulating cooling water in a control cabinet, starting stirring, gradually increasing the rotating speed according to the temperature of the mixing reaction, controlling the stirring linear speed to be below 10m/s when the temperature of the mixing reaction is increased to 60 ℃, gradually reducing the stirring linear speed when the temperature exceeds 75 ℃ to ensure that the linear speed is greater than 5m/s, increasing the flow of the cooling water under the condition of reducing the stirring linear speed and not reducing the temperature to ensure that the temperature of materials in the reactor does not exceed 80 ℃, simultaneously ensuring that the raw materials are not hung on the wall due to overheating by the cooling water, controlling the temperature to be between 60 and 80 ℃ by using a PLC module in the whole mixing reaction process, stably running for 10 to 20min, then reducing the stirring linear speed to 1m/s, and after running for 2min, opening a discharge valve to discharge the materials, and (3) the waste water enters a finished product bin, circulating water still runs in the discharging process, and the frequency of a pump can be reduced by 30-60% of the normal running.
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