CN114632408A - 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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- CN114632408A CN114632408A CN202210373571.4A CN202210373571A CN114632408A CN 114632408 A CN114632408 A CN 114632408A CN 202210373571 A CN202210373571 A CN 202210373571A CN 114632408 A CN114632408 A CN 114632408A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 65
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 238000010791 quenching Methods 0.000 title claims abstract description 60
- 230000000171 quenching effect Effects 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 28
- 230000023556 desulfurization Effects 0.000 claims abstract description 28
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 27
- 239000000428 dust Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 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 32
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 26
- 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 16
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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 13
- 239000001788 mono and diglycerides of fatty acids Substances 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 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
- 238000000889 atomisation Methods 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
- 238000005507 spraying Methods 0.000 claims description 6
- 238000009827 uniform distribution Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 2
- 239000000571 coke Substances 0.000 description 13
- 239000007921 spray Substances 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000779 smoke Substances 0.000 description 5
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- HBAGRTDVSXKKDO-UHFFFAOYSA-N dioxido(dioxo)manganese lanthanum(3+) Chemical compound [La+3].[La+3].[O-][Mn]([O-])(=O)=O.[O-][Mn]([O-])(=O)=O.[O-][Mn]([O-])(=O)=O HBAGRTDVSXKKDO-UHFFFAOYSA-N 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 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
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000002156 mixing Methods 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
- 239000000047 product 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
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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
- B01D53/75—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
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- 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)
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- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of gas purification, in particular to a system and a method for processing dry quenching flue gas, which comprises a first dust remover, a wet desulphurization tower, a cooling tower, a dry desulphurization tower and a second dust remover which are sequentially connected through a pipeline; the wet desulphurization tower is used for carrying out primary desulphurization on the dry quenching flue gas by utilizing the combined action of a urea solution and a catalyst; the dry desulfurizing tower utilizes a dry desulfurizing agent and dry quenching flue gas to carry out secondary desulfurization, and the dry quenching flue gas treatment system of the invention treats SO in the dry quenching flue gas2Has excellent removal 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 system and a method for processing dry quenching flue gas.
Background
In the process of dry quenching, red coke at 1000 ℃ is loaded from the top of a dry quenching furnace, low-temperature inert circulating gas is blown into a red coke layer of a cooling section of the dry quenching furnace by a circulating fan to absorb sensible heat of the red coke, the 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 carry out heat exchange, the boiler generates steam, 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 purpose of the invention is as follows: aiming at the technical problem, the invention provides a system and a method for processing dry quenching flue gas.
The adopted technical scheme is as follows:
a dry quenching flue gas treatment system comprises a first dust remover, a wet desulphurization tower, a cooling tower, a dry desulphurization tower and a second dust remover which are sequentially connected through a pipeline;
the wet desulphurization tower is used for carrying out primary desulphurization on the dry quenching flue gas by utilizing the combined action of a urea solution and a catalyst;
the dry desulfurizing tower carries out secondary desulfurization by utilizing a dry desulfurizing agent and dry quenching flue gas.
Further, the first dust remover and the second dust remover are respectively a bag-type dust remover and/or an electrostatic dust remover.
Furthermore, an atomization spraying system used for spraying the urea solution is arranged in the wet desulphurization 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 a complexing agent, reacting at room temperature for 40-60min, adding gamma-alumina, stirring and reacting at 50-60 ℃ in a water bath for 2-4h, filtering out solids, drying at 85-95 ℃ for 10-15h, grinding, placing the obtained powder in a muffle furnace, heating to 280-300 ℃ at the speed of 1-3 ℃/min, roasting for 1-3h, then heating to 850-900 ℃ at the same speed, continuing to roast for 2-4h, and finally recovering the 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 40-50 deg.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.
Furthermore, still be equipped with the defroster in the wet flue gas desulfurization tower, the smoke inlet department of dry flue gas desulfurization tower is equipped with the equipartition device.
Further, the invention also provides a dry quenching flue gas treatment method, and particularly relates to a dry quenching flue gas treatment method by using the dry quenching flue gas treatment system.
The invention has the beneficial effects that:
the invention provides a system and a method for processing coke dry quenching flue gas, which carry out desulfurization processing on coke dry quenching flue gas by adopting a wet method-dry method combined mode and are used for removing SO in the coke dry quenching flue gas2Has excellent removal effect, the desulfurization efficiency reaches more than 99.9 percent, urea is in contact decomposition with high-temperature dry quenching flue gas to generate ammonia gas under the action of lanthanum manganate @ gamma-alumina as a catalyst during wet desulfurization, and the ammonia gas and SO2Reacting under oxidizing atmosphere to generate (NH)4)2SO4The main reaction is as follows:
(NH2)2CO+H2O＝NH4COONH2 (1)
NH4COONH2＝2NH3+CO2 (2)
2SO2+4NH3+2H2O+O2＝2(NH4)2SO4 (3)
can greatly reduce SO in the dry quenching flue gas2The concentration of lanthanum manganate @ gamma-alumina is taken as a catalyst, lanthanum manganate is coated on the gamma-alumina in a high-dispersion state, more active sites are exposed, the chemical adsorption oxygen ratio is higher, the reaction is promoted, after the surface of sodium bicarbonate powder is treated by glyceryl monostearate, the decomposition interval of the sodium bicarbonate can be improved, the sodium bicarbonate can be decomposed at a proper temperature SO as to be more fully reacted with dry quenching flue gas, and the residual SO is removed2And (4) removing.
Drawings
FIG. 1 is a schematic structural diagram of a dry quenching flue gas treatment system in embodiment 1 of the invention;
FIG. 2 is a first partial schematic view of a dry quenching flue gas treatment system according to example 1 of the present invention, wherein the direction of the arrow is the flow direction of the dry quenching flue gas;
FIG. 3 is a second partial schematic view of a dry quenching flue gas treatment system according to example 1 of the invention, in which the direction of the arrow is the flow direction of the dry quenching flue gas;
the reference numbers in the figures represent respectively:
1-a first dust remover; 2-a wet desulfurization tower; 201-a circulating pump; 202-a liquid storage tank; 203-a demister; 204-atomizing spray heads; 205-an atomizer; 206-a catalyst layer; 3-a cooling tower; 4-a dry desulfurization tower; 401-powder bin; 402-a feeder; 403-a feeding fan; 404-uniform distribution device; 5-a second dust remover.
Detailed Description
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
referring to fig. 1, a dry quenching flue gas treatment system comprises a first dust collector 1 sequentially connected through a pipeline, wherein the first dust collector 1 comprises a bag-type dust collector and an electrostatic dust collector connected in series, a wet desulfurization tower 2, a cooling tower 3, a dry desulfurization tower 4 and a second dust collector 5, and the second dust collector 5 is a bag-type dust collector;
referring to fig. 2, a demister 203, a catalyst layer 206 and an atomization spray system for spraying urea solution containing iminodisuccinic acid are arranged in the wet desulfurization tower 2, the atomization spray system comprises a spray pipe 205, an atomization spray nozzle 204, a circulating pump 201 and a liquid storage tank 202, the urea solution containing iminodisuccinic acid (mass ratio of iminodisuccinic acid: urea: water: 1: 10: 100) is stored in the liquid storage tank 202, is extracted by the circulating pump 201 and becomes atomized liquid drops through the spray pipe 205 and the atomization spray nozzle 204, and is subjected to a combined action with 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, the dry flue gas subjected to primary desulfurization is cooled to below 140 ℃ through a cooling tower 3 and then enters a dry desulfurization tower 4, the dry desulfurizing tower 4 is used for carrying out secondary desulfurization by utilizing the reaction of a dry desulfurizing agent and dry quenching flue gas;
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 the dry desulfurizing agent is rapidly heated, activated and activated by the flue gas in the spraying pipeline through the uniform distribution device 404, SO as to complete sufficient and uniform mixing, the uniform distribution device 404 is arranged at the smoke inlet of the dry desulfurizing tower 4, after entering the dry desulfurizing tower 4, the dry desulfurizing agent with increased activity and specific surface area is fully contacted with the pollutants in the flue gas, SO as to generate physical and chemical reactions, SO in the flue gas2The acidic gas is efficiently absorbed and purified, the desulfurization by-products enter a second dust remover 5 along with the flue gas to be removed and purified, and the purified flue gas is discharged after being detected;
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 for 50min at room temperature, adding 1kg of gamma-alumina, stirring and reacting for 3h in a water bath at 60 ℃, filtering out solids, drying at 90 ℃ for 15h, grinding, putting the obtained powder in a muffle furnace, heating to 300 ℃ at the speed of 2 ℃/min, roasting for 3h, then heating to 900 ℃ at the same speed, continuing to roast for 4h, and finally recovering the room temperature.
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, wherein the mass ratio of glyceryl monostearate to sodium bicarbonate powder is 1: 30, stirring for 40min, transferring to an oven, drying at 50 ℃ for 15h, and grinding.
The method for treating the coke dry quenching flue gas by using the coke dry quenching flue gas treatment system comprises the following steps:
high-temperature dry quenching flue gas is dedusted by a bag-type deduster and an electrostatic deduster which are connected in series, then enters a wet desulphurization tower 2, urea solution containing iminodisuccinic acid is extracted by a circulating pump 201 and then becomes atomized liquid drops through a spray pipeline 205 and an atomization nozzle 204, the atomized liquid drops react with catalyst lanthanum manganate @ gamma-alumina in a catalyst layer 206 to carry out primary desulphurization on the dry quenching flue gas, the dry quenching flue gas after primary desulphurization is cooled to below 140 ℃ by a cooling tower 3 and then enters a dry desulphurization tower 4, the dry desulphurization tower 4 carries out secondary desulphurization by utilizing the reaction of dry desulfurizer and the dry quenching flue gas, the dry desulfurizer is sprayed into the dry desulphurization tower 4 from a powder bin 401 through a 402 and a feeding fan 403, and is mixed with the dry desulfurizer in a pipeline in the process and is rapidly heated, activated and activated by the flue gas in the spray pipeline through a uniform distribution device 404, the uniform distribution device 404 is arranged at the smoke inlet of the dry desulfurization tower 4, and after entering the dry desulfurization tower 4, the dry desulfurization agent with increased activity and specific surface area is fully contacted with pollutants in the smoke to generate physical and chemical reactions, SO in the smoke2、SO3And acidic gases such as HCl and the like are efficiently absorbed and purified, desulfurization byproducts enter a bag-type dust collector along with flue gas to be removed and purified, and the purified flue gas is discharged after detection.
Example 2:
essentially the same as 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 for 60min at room temperature, adding 1kg of gamma-alumina, stirring and reacting for 4h in a water bath at 60 ℃, filtering out solids, drying at 95 ℃ for 15h, grinding, putting the obtained powder in a muffle furnace, heating to 300 ℃ at the speed of 3 ℃/min, roasting for 3h, then heating to 900 ℃ at the same speed, continuing to roast for 4h, and finally recovering the room temperature.
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, wherein the mass ratio of glyceryl monostearate to sodium bicarbonate powder is 1: 30, stirring for 50min, transferring to an oven, drying at 50 ℃ for 15h, and grinding.
Example 3:
essentially the same as 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 for 40min at room temperature, adding 1kg of gamma-alumina, stirring and reacting for 2h in a water bath at 50 ℃, filtering out solids, drying for 10h at 85 ℃, grinding, putting the obtained powder in a muffle furnace, heating to 280 ℃ at the speed of 1 ℃/min, roasting for 1h, then heating to 850 ℃ at the same speed, continuing to roast for 2h, and finally recovering the room temperature.
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, wherein the mass ratio of glyceryl monostearate to sodium bicarbonate powder is 1: 30, stirring for 30min, transferring to an oven, drying at 40 ℃ for 10h, and grinding.
Example 4:
essentially the same as 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 for 40min at room temperature, adding 1kg of gamma-alumina, stirring and reacting for 2h in a water bath at 60 ℃, filtering out solids, drying for 10h at 95 ℃, grinding, putting the obtained powder in a muffle furnace, heating to 280 ℃ at the speed of 3 ℃/min, roasting for 3h, then heating to 850 ℃ at the same speed, continuing to roast for 4h, and finally recovering the room temperature.
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, wherein the mass ratio of glyceryl monostearate to sodium bicarbonate powder is 1: 30, stirring for 30min, transferring to an oven, drying at 50 ℃ for 10h, and grinding.
Example 5:
essentially the same as 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 for 60min at room temperature, adding 1kg of gamma-alumina, stirring and reacting for 4h in a water bath at 50 ℃, filtering out solids, drying at 85 ℃ for 15h, grinding, putting the obtained powder in a muffle furnace, heating to 300 ℃ at the speed of 1 ℃/min, roasting for 1h, then heating to 900 ℃ at the same speed, continuing to roast for 2h, and finally recovering the room temperature.
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, wherein the mass ratio of glyceryl monostearate to sodium bicarbonate powder is 1: 30, stirring for 50min, transferring to an oven, drying at 40 ℃ for 15h, and grinding.
Comparative example 1:
essentially the same as in example 1, except that iminodisuccinic acid was not added to the urea solution.
Comparative example 2:
essentially the same as example 1 except that gamma-alumina was used in place of lanthanum manganate @ gamma-alumina.
Comparative example 3:
substantially the same as in example 1 except that sodium hydrogencarbonate powder was used as a dry desulfurizing agent as it is.
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.
And (4) performance testing:
the coke dry quenching flue gas treatment systems in examples 1 to 5 and comparative examples 1 to 5 were used to treat coke dry quenching flue gas, and the results are shown in table 1 below:
table 1:
as can be seen from the above Table 1, the coke dry quenching flue gas treatment system of the invention is used for treating SO in coke dry quenching flue gas2Has excellent removal effect, and the desulfurization efficiency reaches more than 99.9 percent.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A dry quenching flue gas treatment system is characterized by comprising a first dust remover, a wet desulphurization tower, a cooling tower, a dry desulphurization tower and a second dust remover which are sequentially connected through a pipeline;
the wet desulphurization tower is used for carrying out primary desulphurization on the dry quenching flue gas by utilizing the combined action of a urea solution and a catalyst;
the dry desulfurizing tower carries out secondary desulfurization by utilizing a dry desulfurizing agent and dry quenching flue gas.
2. The dry quenching flue gas treatment system of claim 1, wherein the first dust collector and the second dust collector are a bag dust collector and/or an electrostatic dust collector, respectively.
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 desulphurization tower.
4. The dry quenching flue gas treatment system of claim 1, wherein the urea solution comprises iminodisuccinic acid.
5. The dry quenching flue gas treatment system of claim 1, wherein the catalyst is lanthanum manganate @ gamma-alumina.
6. The dry quenching flue gas treatment system of claim 5, wherein the lanthanum manganate @ gamma-alumina is prepared by the following method:
dissolving lanthanum nitrate and manganese nitrate in water, adding citric acid as a complexing agent, reacting at room temperature for 40-60min, adding gamma-alumina, stirring and reacting at 50-60 ℃ in a water bath for 2-4h, filtering out solids, drying at 85-95 ℃ for 10-15h, grinding, placing the obtained powder in a muffle furnace, heating to 280-300 ℃ at the speed of 1-3 ℃/min, roasting for 1-3h, then heating to 850-900 ℃ at the same speed, continuing to roast for 2-4h, and finally recovering the room temperature.
7. The dry quenching flue gas treatment system of 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 40-50 deg.C for 10-15 hr, and grinding.
8. The dry quenching flue gas treatment system of claim 1, wherein the dry desulfurizing agent is sprayed into the dry desulfurizing tower from the powder bin through a feeder and a feeder fan.
9. The dry quenching flue gas treatment system as claimed in claim 1, wherein a demister is further arranged in the wet desulphurization tower, and a uniform distribution device is arranged at the flue gas inlet of the dry desulphurization tower.
10. A dry quenching flue gas treatment method, 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 9.
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