CN114632408B - Dry quenching flue gas treatment system and method thereof - Google Patents
Dry quenching flue gas treatment system and method thereof Download PDFInfo
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- CN114632408B CN114632408B CN202210373571.4A CN202210373571A CN114632408B CN 114632408 B CN114632408 B CN 114632408B CN 202210373571 A CN202210373571 A CN 202210373571A CN 114632408 B CN114632408 B CN 114632408B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000003546 flue gas Substances 0.000 title claims abstract description 65
- 238000010791 quenching Methods 0.000 title claims abstract description 61
- 230000000171 quenching effect Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 49
- 230000023556 desulfurization Effects 0.000 claims abstract description 49
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004202 carbamide Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 8
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 30
- 239000000843 powder Substances 0.000 claims description 26
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 24
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 21
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 21
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 15
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 229940075507 glyceryl monostearate Drugs 0.000 claims description 12
- 239000001788 mono and diglycerides of fatty acids Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000000889 atomisation Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- PQHYOGIRXOKOEJ-UHFFFAOYSA-N 2-(1,2-dicarboxyethylamino)butanedioic acid Chemical compound OC(=O)CC(C(O)=O)NC(C(O)=O)CC(O)=O PQHYOGIRXOKOEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000008139 complexing agent Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims description 7
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000009827 uniform distribution Methods 0.000 claims description 5
- HBAGRTDVSXKKDO-UHFFFAOYSA-N dioxido(dioxo)manganese lanthanum(3+) Chemical group [La+3].[La+3].[O-][Mn]([O-])(=O)=O.[O-][Mn]([O-])(=O)=O.[O-][Mn]([O-])(=O)=O HBAGRTDVSXKKDO-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- 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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of gas purification, in particular to a dry quenching flue gas treatment system and a method thereof, wherein the dry quenching flue gas treatment system comprises a first dust remover, a wet desulfurization tower, a cooling tower, a dry desulfurization tower and a second dust remover which are connected in sequence through pipelines; the wet desulfurization tower utilizes the combined action of urea solution and catalyst to desulfurize the dry quenching flue gas once; the dry desulfurization tower performs secondary desulfurization by using a dry desulfurizing agent and dry quenching flue gas, and the dry quenching flue gas treatment system provided by the invention is used for treating SO in the dry quenching flue gas 2 Has excellent removing effect, and the desulfurization efficiency reaches more than 99.9 percent.
Description
Technical Field
The invention relates to the technical field of gas purification, in particular to a dry quenching flue gas treatment system and a method thereof.
Background
In the dry quenching process, red coke at 1000 ℃ is filled from the top of the dry quenching furnace, low-temperature inert circulating gas is blown into a layer of cooling Duan Gongjiao of the dry quenching furnace by a circulating fan to absorb red Jiao Xianre, cooled coke is discharged from the bottom of the dry quenching furnace, high-temperature inert gas discharged from an annular flue of the dry quenching furnace flows through a dry quenching boiler to perform heat exchange, steam is generated by the boiler, the cooled inert gas is blown into the dry quenching furnace again by the circulating fan, and the inert gas is recycled in a closed system.
Disclosure of Invention
The invention aims to: aiming at the technical problems, the invention provides a dry quenching flue gas treatment system and a dry quenching flue gas treatment method.
The technical scheme adopted is as follows:
a dry quenching flue gas treatment system comprises a first dust remover, a wet desulfurization tower, a cooling tower, a dry desulfurization tower and a second dust remover which are connected in sequence through pipelines;
the wet desulfurization tower utilizes the combined action of urea solution and catalyst to desulfurize the dry quenching flue gas once;
the dry desulfurizing tower is used for carrying out secondary desulfurization by using a dry desulfurizing agent and dry quenching flue gas.
Further, the first dust remover and the second dust remover are respectively cloth bag dust removers and/or electrostatic precipitators.
Further, an atomization spraying system for spraying the urea solution is arranged in the wet desulfurization tower.
Further, the urea solution contains iminodisuccinic acid.
Further, the catalyst is lanthanum manganate @ gamma-alumina.
Further, the preparation method of the lanthanum manganate @ gamma-alumina comprises the following steps:
dissolving lanthanum nitrate and manganese nitrate in water, adding citric acid as complexing agent, reacting at room temperature for 40-60min, adding gamma-alumina, stirring at 50-60 ℃ for 2-4h, filtering out solid, drying at 85-95 ℃ for 10-15h, grinding, placing the obtained powder in a muffle furnace, heating to 280-300 ℃ at a speed of 1-3 ℃/min, roasting for 1-3h, heating to 850-900 ℃ at the same speed, continuously roasting for 2-4h, and finally recovering room temperature.
Further, the preparation method of the dry desulfurizing agent comprises the following steps:
dissolving glyceryl monostearate with diethyl ether, adding sodium bicarbonate powder with particle diameter of 10-30 μm, stirring for 30-50min, transferring into oven, drying at 40-50deg.C for 10-15 hr, and grinding.
Further, the dry desulfurizing agent is sprayed into the dry desulfurizing tower from the powder bin through a feeder and a feeding fan.
Further, demisters are further arranged in the wet desulfurization tower, and a smoke inlet of the dry desulfurization tower is provided with uniform distribution devices.
The invention further provides a method for treating the dry quenching flue gas, and particularly relates to a method for treating the dry quenching flue gas by using the dry quenching flue gas treatment system.
The invention has the beneficial effects that:
the invention provides a dry quenching flue gas treatment system and a method thereof, which carry out desulfurization treatment on dry quenching flue gas by adopting a wet-dry method combined mode and carry out desulfurization treatment on SO in the dry quenching flue gas 2 Has excellent removing effect, the desulfurization efficiency reaches more than 99.9 percent, and under the action of catalyst lanthanum manganate @ gamma-alumina, urea is contacted and decomposed with high-temperature dry quenching flue gas to generate ammonia, ammonia and SO during wet desulfurization 2 React in an oxidizing atmosphere to form (NH) 4 ) 2 SO 4 The main reactions are as follows:
(NH 2 ) 2 CO+H 2 O＝NH 4 COONH 2 (1)
NH 4 COONH 2 ＝2NH 3 +CO 2 (2)
2SO 2 +4NH 3 +2H 2 O+O 2 ＝2(NH 4 ) 2 SO 4 (3)
can greatly reduce SO in the dry quenching flue gas 2 Concentration of lanthanum manganate @ gamma-alumina is used as a catalyst, lanthanum manganate is coated on gamma-alumina in a high dispersion state, more active sites are exposed, the catalyst has higher chemical adsorption oxygen proportion, the reaction is promoted, and after the surface of sodium bicarbonate powder is treated by glycerol monostearateCan promote the decomposition zone of sodium bicarbonate to decompose at proper temperature SO as to react with dry quenching flue gas more fully and make the residual SO 2 And (5) removing.
Drawings
FIG. 1 is a schematic diagram of a dry quenching flue gas treatment system in embodiment 1 of the present invention;
FIG. 2 is a first partial schematic view of the dry quenching flue gas treatment system in embodiment 1 of the present invention, wherein the arrow direction in the figure is the flow direction of the dry quenching flue gas;
FIG. 3 is a second partial schematic view of the dry quenching flue gas treatment system in embodiment 1 of the present invention, wherein the arrow direction in the figure is the flow direction of the dry quenching flue gas;
the reference numerals in the figures represent:
1-a first dust remover; 2-a wet desulfurizing tower; 201-a circulation pump; 202-a liquid storage tank; 203-a mist eliminator; 204-atomizing spray head; 205-atomizing nozzle; 206-a catalyst layer; 3-a cooling tower; 4-a dry desulfurizing tower; 401-powder bin; 402-a feeder; 403-a feeding fan; 404-uniformly distributing devices; 5-a second dust remover.
Detailed Description
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1:
referring to fig. 1, a dry quenching flue gas treatment system comprises a first dust remover 1 connected sequentially through a pipeline, wherein the first dust remover 1 comprises a cloth bag dust remover and an electrostatic dust remover, a wet desulfurization tower 2, a cooling tower 3, a dry desulfurization tower 4 and a second dust remover 5 which are connected in series, and the second dust remover 5 is a cloth bag dust remover;
referring to fig. 2, a demister 203, a catalyst layer 206 and an atomization spraying system for spraying a urea solution containing iminodisuccinic acid are arranged in the wet desulfurization tower 2, the atomization spraying system comprises a spraying pipeline 205, an atomization spray nozzle 204, a circulating pump 201 and a liquid storage tank 202, the urea solution containing iminodisuccinic acid (the mass ratio of iminodisuccinic acid to urea: water=1:10:100) is stored in the liquid storage tank 202, is pumped by the circulating pump 201 and forms atomization liquid drops through the spraying pipeline 205 and the atomization spray nozzle 204, and acts together with a catalyst lanthanum manganate @ gamma-alumina in the catalyst layer 206 to perform primary desulfurization on dry quenching flue gas reaction, the catalyst layer 206 comprises a bracket for containing the catalyst lanthanum manganate @ gamma-alumina, and the dry quenching flue gas after primary desulfurization enters the dry desulfurization tower 4 after being cooled to below 140 ℃ through a cooling tower 3, and the dry desulfurization tower 4 performs secondary desulfurization by utilizing the dry desulfurization agent and the dry quenching flue gas reaction;
referring to fig. 3 again, the dry desulfurizing agent is sprayed into the dry desulfurizing tower 4 from the powder bin 401 through the feeder 402 and the feeding fan 403, and is mixed with the dry desulfurizing agent in the pipeline in the process, and is heated, activated and activated rapidly by the flue gas in the spraying pipeline through the uniform distribution device 404, SO as to complete the full uniform mixing, the uniform distribution device 404 is arranged at the flue inlet of the dry desulfurizing tower 4, and after entering the dry desulfurizing tower 4, the dry desulfurizing agent with increased activity and specific surface area is fully contacted with pollutants in the flue gas, and physical and chemical reactions occur, SO that SO in the flue gas 2 The acid gas is efficiently absorbed and purified, the desulfurization byproducts enter a second dust remover 5 along with the flue gas for removal and purification, and the purified flue gas is discharged after detection;
the preparation method of the lanthanum manganate @ gamma-alumina comprises the following steps:
dissolving 324.9g of lanthanum nitrate and 178.9g of manganese nitrate in 8kg of water, adding 384g of citric acid as a complexing agent, reacting at room temperature for 50min, adding 1kg of gamma-alumina, stirring at 60 ℃ for 3h, filtering out the solid, drying at 90 ℃ for 15h, grinding, placing the obtained powder in a muffle furnace, heating to 300 ℃ at a speed of 2 ℃/min, roasting for 3h, heating to 900 ℃ at the same speed, continuously roasting for 4h, and finally recovering to room temperature.
The preparation method of the dry desulfurizing agent comprises the following steps:
after dissolution of glyceryl monostearate with diethyl ether, sodium bicarbonate powder with a particle size of 10-30 μm was added, and the mass ratio of glyceryl monostearate to sodium bicarbonate powder was 1:30, stirring for 40min, transferring into an oven, drying at 50 ℃ for 15h, and grinding.
The method for treating the dry quenching flue gas by using the dry quenching flue gas treatment system comprises the following steps:
the high-temperature dry quenching flue gas enters a wet desulfurization tower 2 after being dedusted by a cloth bag deduster and an electrostatic precipitator which are connected in series, urea solution containing iminodisuccinic acid is pumped by a circulating pump 201 and then becomes atomized liquid drops through a spray pipeline 205 and an atomization spray nozzle 204, the atomized liquid drops in a catalyst layer 206 interact with catalyst lanthanum manganate @ gamma-alumina to carry out primary desulfurization on the dry quenching flue gas reaction, the dry quenching flue gas after primary desulfurization is cooled to 140 ℃ by a cooling tower 3 and then enters a dry desulfurization tower 4, the dry desulfurization tower 4 carries out secondary desulfurization by utilizing the reaction of a dry desulfurizing agent and the dry quenching flue gas, the dry desulfurizing agent is sprayed into the dry desulfurization tower 4 from a powder bin 401 and is mixed with the dry desulfurizing agent in the pipeline in the process, the dry desulfurizing agent is heated, activated and activated uniformly and activated rapidly in the spray pipeline through a uniform distribution device 404, the full uniform mixing is completed, the dry desulfurizing agent with increased activity and specific surface area is arranged at a flue gas inlet of the dry desulfurization tower 4, and the dry desulfurizing agent with pollutants in the dry desulfurization tower 4 fully contacts with the pollutants in the flue gas and the chemical reaction SO that SO in the flue gas is fully reacted 2 、SO 3 Acid gases such as HCl and the like are efficiently absorbed and purified, desulfurization byproducts enter a bag-type dust remover along with the flue gas for removal and purification, and the purified flue gas is discharged after detection.
Example 2:
substantially the same as in example 1, except that lanthanum manganate @ gamma-alumina was prepared as follows:
dissolving 324.9g of lanthanum nitrate and 178.9g of manganese nitrate in 8kg of water, adding 384g of citric acid as a complexing agent, reacting at room temperature for 60min, adding 1kg of gamma-alumina, stirring at 60 ℃ for 4h, filtering out the solid, drying at 95 ℃ for 15h, grinding, placing the obtained powder in a muffle furnace, heating to 300 ℃ at a speed of 3 ℃/min, roasting for 3h, heating to 900 ℃ at the same speed, continuously roasting for 4h, and finally recovering to room temperature.
The preparation method of the dry desulfurizing agent comprises the following steps:
after dissolution of glyceryl monostearate with diethyl ether, sodium bicarbonate powder with a particle size of 10-30 μm was added, and the mass ratio of glyceryl monostearate to sodium bicarbonate powder was 1:30, stirring for 50min, transferring into an oven, drying at 50 ℃ for 15h, and grinding.
Example 3:
substantially the same as in example 1, except that lanthanum manganate @ gamma-alumina was prepared as follows:
dissolving 324.9g of lanthanum nitrate and 178.9g of manganese nitrate in 8kg of water, adding 384g of citric acid as a complexing agent, reacting at room temperature for 40min, adding 1kg of gamma-alumina, stirring at 50 ℃ for 2h, filtering out the solid, drying at 85 ℃ for 10h, grinding, placing the obtained powder in a muffle furnace, heating to 280 ℃ at a speed of 1 ℃/min, roasting for 1h, heating to 850 ℃ at the same speed, continuously roasting for 2h, and finally recovering the room temperature.
The preparation method of the dry desulfurizing agent comprises the following steps:
after dissolution of glyceryl monostearate with diethyl ether, sodium bicarbonate powder with a particle size of 10-30 μm was added, and the mass ratio of glyceryl monostearate to sodium bicarbonate powder was 1:30, stirring for 30min, transferring to an oven, drying at 40 ℃ for 10h, and grinding.
Example 4:
substantially the same as in example 1, except that lanthanum manganate @ gamma-alumina was prepared as follows:
dissolving 324.9g of lanthanum nitrate and 178.9g of manganese nitrate in 8kg of water, adding 384g of citric acid as a complexing agent, reacting at room temperature for 40min, adding 1kg of gamma-alumina, stirring at 60 ℃ for 2h, filtering out the solid, drying at 95 ℃ for 10h, grinding, placing the obtained powder in a muffle furnace, heating to 280 ℃ at a speed of 3 ℃/min, roasting for 3h, heating to 850 ℃ at the same speed, continuously roasting for 4h, and finally recovering the room temperature.
The preparation method of the dry desulfurizing agent comprises the following steps:
after dissolution of glyceryl monostearate with diethyl ether, sodium bicarbonate powder with a particle size of 10-30 μm was added, and the mass ratio of glyceryl monostearate to sodium bicarbonate powder was 1:30, stirring for 30min, transferring into an oven, drying at 50 ℃ for 10h, and grinding.
Example 5:
substantially the same as in example 1, except that lanthanum manganate @ gamma-alumina was prepared as follows:
dissolving 324.9g of lanthanum nitrate and 178.9g of manganese nitrate in 8kg of water, adding 384g of citric acid as a complexing agent, reacting at room temperature for 60min, adding 1kg of gamma-alumina, stirring at 50 ℃ for 4h, filtering out the solid, drying at 85 ℃ for 15h, grinding, placing the obtained powder in a muffle furnace, heating to 300 ℃ at a speed of 1 ℃/min, roasting for 1h, heating to 900 ℃ at the same speed, continuously roasting for 2h, and finally recovering to room temperature.
The preparation method of the dry desulfurizing agent comprises the following steps:
after dissolution of glyceryl monostearate with diethyl ether, sodium bicarbonate powder with a particle size of 10-30 μm was added, and the mass ratio of glyceryl monostearate to sodium bicarbonate powder was 1:30, stirring for 50min, transferring into an oven, drying at 40 ℃ for 15h, and grinding.
Comparative example 1:
substantially the same as in example 1, except that iminodisuccinic acid was not added to the urea solution.
Comparative example 2:
substantially the same as in example 1, except that the lanthanum manganate @ gamma-alumina was replaced with gamma-alumina.
Comparative example 3:
substantially the same as in example 1, except that sodium hydrogencarbonate powder was directly used as the dry desulfurizing agent.
Comparative example 4:
substantially the same as in example 1, except that the dry desulfurization tower 4 was not provided, only wet desulfurization was performed.
Comparative example 5:
substantially the same as in example 1, except that the wet desulfurization tower 2 was not provided, only dry desulfurization was performed.
Performance test:
the dry quenching flue gas treatment systems of examples 1-5 and comparative examples 1-5 were used to treat dry quenching flue gas, respectively, and the results are shown in table 1 below:
table 1:
as can be seen from the above Table 1, the dry quenching flue gas treatment system of the invention is applicable to SO in dry quenching flue gas 2 Has excellent removing effect, and the desulfurization efficiency reaches more than 99.9 percent.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The dry quenching flue gas treatment system is characterized by comprising a first dust remover, a wet desulfurization tower, a cooling tower, a dry desulfurization tower and a second dust remover which are connected in sequence through pipelines;
the wet desulfurization tower utilizes the combined action of urea solution and catalyst to desulfurize the dry quenching flue gas once;
the urea solution contains iminodisuccinic acid;
the catalyst is lanthanum manganate@gamma-alumina;
the dry desulfurizing tower is used for carrying out secondary desulfurization by using a dry desulfurizing agent and dry quenching flue gas.
2. The dry quenching flue gas treatment system as claimed in claim 1, wherein the first dust remover and the second dust remover are respectively a bag-type dust remover and/or an electrostatic dust remover.
3. The dry quenching flue gas treatment system as claimed in claim 1, wherein an atomization spraying system for spraying the urea solution is arranged in the wet desulfurization tower.
4. The dry quenching flue gas treatment system as claimed in claim 1, wherein the preparation method of lanthanum manganate @ gamma-alumina comprises the following steps:
dissolving lanthanum nitrate and manganese nitrate in water, adding citric acid as complexing agent, reacting at room temperature for 40-60min, adding gamma-alumina, stirring at 50-60 ℃ for 2-4h, filtering out solid, drying at 85-95 ℃ for 10-15h, grinding, placing the obtained powder in a muffle furnace, heating to 280-300 ℃ at a speed of 1-3 ℃/min for roasting for 1-3h, heating to 850-900 ℃ at the same speed for 2-4h, and finally recovering room temperature.
5. The dry quenching flue gas treatment system as claimed in claim 1, wherein the dry desulfurizing agent is prepared by the following method:
dissolving glyceryl monostearate with diethyl ether, adding sodium bicarbonate powder with particle diameter of 10-30 μm, stirring for 30-50min, transferring into oven, drying at 40-50deg.C for 10-15 hr, and grinding.
6. The dry quenching flue gas treatment system of claim 1, wherein the dry desulfurizing agent is sprayed into the dry desulfurizing tower from a powder bin via a feeder and a feed fan.
7. The dry quenching flue gas treatment system according to claim 1, wherein a demister is further arranged in the wet desulfurization tower, and a uniform distribution device is arranged at a flue gas inlet of the dry desulfurization tower.
8. A method for treating dry quenching flue gas, characterized in that the dry quenching flue gas is treated by using the dry quenching flue gas treatment system as claimed in any one of claims 1 to 7.
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