CN105444195A - Multi-pollutant synergistic treating method and system for coal-fired flue gas - Google Patents
Multi-pollutant synergistic treating method and system for coal-fired flue gas Download PDFInfo
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- CN105444195A CN105444195A CN201510982808.9A CN201510982808A CN105444195A CN 105444195 A CN105444195 A CN 105444195A CN 201510982808 A CN201510982808 A CN 201510982808A CN 105444195 A CN105444195 A CN 105444195A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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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
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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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/10—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
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Abstract
The invention discloses a multi-pollutant synergistic treating method for coal-fired flue gas. The method comprises the following steps: pre-burning the coal-fired glue gas in a low-temperature oxygen-deficient environment so as to remove nitric oxide, and then removing mercury in the flue gas; removing sulfur trioxide in the mercury-removed flue gas, and then denitrating; treating the denitrated flue gas by low-temperature electrostatic dust removal, and then performing boiling type foam desulfurization dust removing treatment and wet type electrostatic dust removing treatment for the flue gas. According to the method, the unit processes and devices for performing desulfurization, denitrating, dust removing and mercury removing for the tail flue gas of a traditional coal-fired boiler are subjected to organic reasonable combination, comprehensive integral design and high integration treatment, thus the ultra-clean emission of various pollutants can be realized, and the emission concentration of various pollutants in the flue gas can be minimized; a large smoke channel connecting system for independent operation of each unit process and device can be saved, and corresponding flue gas collecting and dispersion distribution facilities can be also saved, so that the investment and the used area can be greatly reduced; the flue gas flowing resistance of the devices can be effectively reduced; the operation cost can be saved a lot.
Description
Technical field
The present invention relates to coal-fired flue-gas process, particularly a kind of coal-fired flue-gas multi-pollutant cooperative processing method and system thereof.
Background technology
Acid rain problem and greenhouse effects are global environmental problems of face of mankind nowadays.The sulfur dioxide SO2 that fire coal produces and nitrogen oxide NOX pollution are the major primary things of acid rain, and the carbon dioxide CO2 produced is then main greenhouse gases, and wherein the discharge capacity of CO2 accounts for 30% of the CO2 total release that mankind's activity causes.The energy resource structure of China is based on coal, and polluting coal-fired flue-gas and control to be realize requirement that is economic, social, harmonious development, is also the requirement playing coal in China superiority of reserves, realize self sustainable development of society.At present, to the control technology that coal-fired flue-gas pollutes, as the great majority such as desulphurization and denitration, dedusting and decarburization or exploitation separately, form independently technical equipment and technological process separately.Domestic and international coal-burning power plant is in order to reach the requirement of environment protection emission, and SO2, NOX in removing smoke and dust, at least need employing two to overlap above independently desulphurization and denitration and cleaner.In the face of the aggravation of global greenhouse effects, domestic and international coal-burning power plant also has to the decarburization technique of studying coal-fired flue gas, and some large enterprises are even building independently power plant's decarburization engineering.In order to solve the problem existing for coal-fired flue-gas pollutant dispersion removing sulfuldioxide, publication number is that the Chinese utility model patent description of CN2712446Y and CN274697IY proposes one " flue gas desulfurization and denitrification device " and a kind of " Desulfurization and Denitration Integrated Flue Gas Purification Tower " respectively, but its desulphurization denitration equipment is the filler device of volume bulkiness, and directly employing ammonia spirit absorbs the NOX in flue gas, not only the resistance of whole desulphurization denitration equipment significantly increases, nor the NOX that can effectively remove in flue gas, because more than 90% is nitric oxide NO in NOX component, and NO is difficult to be dissolved in the water, simple washing method is adopted to be difficult to NO to absorb.Publication number is that the Chinese invention patent application prospectus of CN1559654A describes one " desulfurization, dedusting, denitrogenation, defluorinate wet-type smoke purification machine group and purification method thereof ", it utilizes alkali lye to mix the multiple pollutant removed in flue gas with flue gas, but this unit and purification method can produce a large amount of waste water, not only need to carry out reprocessing to waste water, and this technical scheme is too low to the removal efficiency of NOX, simultaneously also high to the requirement for anticorrosion of equipment, cause complex process, operating cost increases.Existing Single Pollution thing control system is simple combination just, cost is high, serious waste of resources, be difficult to realize the ultra-clean discharge of multiple pollutant, especially to sulfur trioxide, its existence can cause SCR to move back fortune when underload, discharged nitrous oxides is caused to exceed standard, even heavy corrosion post equipment.Therefore, need badly and develop cost rationally, reliable, the coal-fired flue-gas ultra-clean draining technology system of low energy consumption.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of coal-fired flue-gas multi-pollutant cooperative processing method and system thereof, realize the ultra-clean discharge of multiple pollutant, at utmost reduce the concentration of emission of various pollutants of fume.
Coal-fired flue-gas multi-pollutant cooperative processing method of the present invention, comprises the following steps:
A. fuel flue gas is made to carry out demercuration process to flue gas after precombustion denitrification under cold and oxygen deficient environment;
B. by the flue gas of demercuration process after de-sulfur trioxide process again through denitration process;
C. by the flue gas after denitration process after low low temp. electric dust removal process more first after through boiling type foam desulfurization and dedusting and wet-esp process;
Further, in step a, carry out demercuration process by mixing with flue gas after the atomization of bromination acticarbon;
Further, in step b, carry out de-sulfur trioxide process by mixing with flue gas after sulfur trioxide absorption agent atomization, described sulfur trioxide absorption agent is the mass fraction of sodium carbonate and distillation demineralized water composition is the sodium carbonate liquor of 10 ~ 30%;
Further, in step b, the temperature of described sodium carbonate liquor is 30 DEG C ~ 50 DEG C; The atomized spray coverage rate of described sodium carbonate liquor is not less than 150%;
Further, in step b, adopt the denitration of CR Selective catalytic reduction to carry out denitration process to flue gas, described catalyst to SO2 conversion ratio not higher than 1%;
Further, remove dust and sulfuric acid droplet to the flue gas before low low temp. electric dust removal process further through waste heat recovery with to the flue gas after wet-esp process, the entrance flue gas temperature of low low temp. electric dedusting is 85 ~ 95 DEG C, and flue gas ratio resistance is 10
10~ 10
11Ω cm.
Coal-fired flue-gas multi-pollutant coprocessing system of the present invention, comprise low NO, demercuration adsorbent spraying system, sulfur trioxide remove system and desulfur denitrate dust collecting system and the absorption tower that is communicated with wet electrical dust precipitator exhaust pass, fuel carries out demercuration process through demercuration adsorbent spraying system after low NO burning process, then removes after system removes sulfur trioxide through sulfur trioxide and enters desulfur denitrate dust collecting system;
Further, described desulfur denitrate dust collecting system comprises SCR denitration device, low low temp. electric deduster, boiling type foam desulfurization and dedusting absorption tower and wet electrical dust precipitator, the flue gas removing system process through sulfur trioxide enters boiling type foam desulfurization and dedusting absorption tower and carries out two-stage dust removal and desulfurization process after low low temp. electric deduster carries out primary dust removing, then carry out 3-stage dust-removal through wet electrical dust precipitator and remove the sulfuric acid droplet in flue gas, the gas approach of described low low temp. electric deduster is provided with residual neat recovering system;
Further, boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister is provided with in described boiling type foam desulfurization and dedusting absorption tower;
Further, described boiling type foam mass transfer elements arranges two-layer, ground floor foam member is from flue entrance top mark rise from being not less than 1m, second layer foam member is not less than 1.5m from ground floor spraying layer distance, between two layers of foam component, spacing is not less than 2m, described wall ring arranges 1 ~ 3 layer, wall ring width is not less than 200mm, described slurries spraying layer is intersect 3 ~ 5 layers that are dislocatedly distributed, described honeycomb fashion centrifugal demister arranges 1 ~ 2 layer, the centrifugal drift angle of demister blade is 30 °, every layer of demister arranges flushing water up and down respectively, demister outlet droplet concentration is less than 20mg/Nm
3, total pressure drag is less than 350Pa.
Beneficial effect of the present invention: coal-fired flue-gas multi-pollutant cooperative processing method of the present invention and system thereof,
To traditional coal-burning boiler tail flue gas desulfurization, denitration, dedusting and each cell process of demercuration and device carry out organic rational combination, comprehensive integrated design, the process of Highgrade integration, realize the ultra-clean discharge of multiple pollutant, at utmost reduce the concentration of emission of various pollutants of fume, eliminate the huge flue connected system needed for each cell process and device independent operating, and corresponding fume collection and diffusion profile facility, significantly decrease investment and floor space, also the smoke flow resistance of equipment is effectively reduced, save a large amount of operating cost.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Fig. 1 is structural representation of the present invention, as shown in the figure: coal-fired flue-gas multi-pollutant cooperative processing method of the present invention, comprises the following steps:
A. fuel flue gas is made to carry out demercuration process to flue gas after precombustion denitrification under cold and oxygen deficient environment; First First air and fuel rapid mixing in precombustion chamber, fuel precombustion discharge volatile matter under cold and oxygen deficient environment, thus reduce NO
xgeneration; Demercuration process adopts demercuration adsorbent inject process, improves the oxidation effectiveness to Elemental Mercury, for carrying out first demercuration to fuel flue gas;
B. by the flue gas of demercuration process after de-sulfur trioxide process again through denitration process; In coal fired power plant flue gas, SO
3from two aspects: one is in coal combustion process, in coal, flammable combustion of sulfur generates SO
2, part SO
2be oxidized to SO further
3, the wherein SO of about 0.5% ~ 2%
2be oxidized to SO3 further; Two is in SCR denitration process, part SO in flue gas
2catalyzed dose of catalytic oxidation is SO
3, the SO of about 0.5% ~ 1.5%
2catalyzedly be oxidized to SO
3, SO
2oxygenation efficiency depends on type and the operating condition of catalyst; SO in flue gas
3to denitration process and the following harm of technique existence later:
1. in denitration reaction equipment, in the temperature range of 235 ~ 308 DEG C, NH
3with SO
3react generation ammonium hydrogen sulfate, and ammonium hydrogen sulfate is deposited on catalyst surface, blocking catalyst hole, and except activity and the life-span of low catalyst, make denitration reaction equipment that spray ammonia need be stopped out of service when underload, low temperature catalyst also cannot use; The viscosity of ammonium hydrogen sulfate causes a large amount of flying dust to be deposited on air preheater surface to cause air preheater to block, and causes electric cleaner to stick with paste plate simultaneously, electric-bag complex dust collector sticks with paste the problems such as bag;
2. SO in flue gas
3in the activity of ash surface, competitive Adsorption is there is, SO with Hg
3be adsorbed on ash surface, reduce the adsorption capacity of flying dust to flue gas Hg, thus work in coordination with demercuration ability except low dust pelletizing system, at present, the desulphurization and denitration of bituminous coal power plant construction, dust removal installation are to the SO in flue gas
3remove limited in one's ability, and SCR run after, add the SO in flue gas to a certain extent
3concentration, causes the problem such as equipment corrosion, blocking, " Lan Yu ", jeopardizes the safe operation of unit and cause environmental pollution;
C. by the flue gas after denitration process after low low temp. electric dust removal process more first after through boiling type foam desulfurization and dedusting and wet-esp process; This step realizes SO
2,sO
3,the associated treatment of the pollutants such as dust (comprising PM10, PM2.5 and following particulate pollutant), mercury, finally realizes the ultra-clean discharge of multiple pollutant, at utmost reduces the concentration of emission of various pollutants of fume.
In the present embodiment, in step a, carry out demercuration process by mixing with flue gas after the atomization of bromination acticarbon; The bromination active carbon that demercuration adsorbent spraying system selects oxidability strong, eject position is that boiler furnace sprays, and improves the oxidation effectiveness to Elemental Mercury.
In the present embodiment, in step b, carry out de-sulfur trioxide process by mixing with flue gas after sulfur trioxide absorption agent atomization, described sulfur trioxide absorption agent is the mass fraction of sodium carbonate and distillation demineralized water composition is the sodium carbonate liquor of 10 ~ 30%; The solvent of obtain solution adopts power plant's distillation demineralized water, the optional SCR denitration system of eject position of sodium carbonate liquor imports and exports flue, air preheater exhaust pass, wet desulphurization absorption tower gas approach, and sodium carbonate liquor sprays to adopt and sprays grid or twin spray gun.
In the present embodiment, in step b, the temperature of described sodium carbonate liquor is 30 DEG C ~ 50 DEG C; The atomized spray coverage rate of described sodium carbonate liquor is not less than 150%; Absorbent solution storage facilities and conveyance conduit should take certain heating and thermal insulation measure; control sodium carbonate liquor temperature at 30 DEG C ~ 50 DEG C; prevent Yin Wendu from reducing and causing the problems such as crystallization; during sodium carbonate liquor spraying system employing twin lance ejection; corresponding cooling protection wind should be set, prevent sodium carbonate liquor from not spraying front solidification.
In the present embodiment, in step b, adopt the denitration of CR Selective catalytic reduction to carry out denitration process to flue gas, described catalyst to SO2 conversion ratio not higher than 1%; Denitration efficiency is not less than 80%.
In the present embodiment, remove dust and sulfuric acid droplet to the flue gas before low low temp. electric dust removal process further through waste heat recovery with to the flue gas after wet-esp process, the entrance flue gas temperature of low low temp. electric dedusting is 85 ~ 95 DEG C, and flue gas ratio resistance is 10
10~ 10
11Ω cm; Adopt Teflon plastic heat exchanger to carry out waste heat recovery, corrosion resistance is strong, and exchange capability of heat is large, degree of depth Mist heat recovering data, reduces flue-gas temperature, makes SO
3aggegation, on flue dust surface, removes after entering electric precipitation, improves SO
3removal efficiency;
The entrance flue gas temperature of low low temp. electric dedusting is low, and flue gas ratio resistance is little, and efficiency of dust collection is high, and reentrainment of dust is few, degree of depth Mist heat recovering data, reduces flue-gas temperature, makes SO
3aggegation, on flue dust surface, removes after entering electric precipitation, improves SO
3removal efficiency.
Coal-fired flue-gas multi-pollutant coprocessing system of the present invention, comprise low NO 1, demercuration adsorbent spraying system 2, sulfur trioxide remove system 3 and desulfur denitrate dust collecting system, fuel carries out demercuration process through demercuration adsorbent spraying system 2 after low NO 1 burns process, then removes after system 3 removes sulfur trioxide through sulfur trioxide and enters desulfur denitrate dust collecting system; Low NO 1 reduces NO
xgeneration, demercuration adsorbent spraying system 2 is for carrying out first demercuration to fuel flue gas, and desulfur denitrate dust collecting system is used for realizing SO
2,sO
3,the associated treatment of the pollutants such as dust (comprising PM10, PM2.5 and following particulate pollutant), mercury, finally realizes the ultra-clean discharge of multiple pollutant, at utmost reduces the concentration of emission of various pollutants of fume; Sulfur trioxide removes system 3 and removes sulfur trioxide solution NH
3with SO
3react generation ammonium hydrogen sulfate, ammonium hydrogen sulfate is deposited on catalyst surface, blocking catalyst hole, except activity and the life-span of low catalyst, causes denitrating system need stop when underload spraying the problem that in the out of service and subsequent technique of ammonia, low temperature catalyst also cannot use; The blockage problem that the viscosity simultaneously solving ammonium hydrogen sulfate causes a large amount of flying dust to be deposited on equipment surface to cause, and and then the safe operation problem that causes equipment short circuit to cause.
In the present embodiment, described desulfur denitrate dust collecting system comprises SCR denitration device 4, low low temp. electric deduster 6, boiling type foam desulfurization and dedusting absorption tower 7 and wet electrical dust precipitator 8 and the absorption tower 9 be communicated with wet electrical dust precipitator exhaust pass, remove through sulfur trioxide the flue gas that system 3 processes after low low temp. electric deduster 6 carries out primary dust removing, to enter boiling type foam desulfurization and dedusting absorption tower 7 carry out two-stage dust removal and desulfurization process, then carry out 3-stage dust-removal through wet electrical dust precipitator 8 and absorption tower 9 and remove the sulfuric acid droplet in flue gas, the gas approach of described low low temp. electric deduster 6 is provided with residual neat recovering system, sulfur trioxide removes after system 3 removes sulfur trioxide, avoids NH
3with SO
3react generation ammonium hydrogen sulfate, ammonium hydrogen sulfate is deposited on catalyst surface, ensure activity and the life-span of catalyst, guarantee the normal operation of SCR, low low temp. electric deduster 6, boiling type foam desulfurization and dedusting absorption tower 7 and wet electrical dust precipitator 8 and air preheater, avoid causing simultaneously wet electrical dust precipitator 8 break down problem (as electric cleaner stick with paste plate, electric-bag complex dust collector sticks with paste the problems such as bag).Each equipment there will not be the problem such as burn into blocking, " Lan Yu ", ensures the safe operation of each equipment of unit and avoids problem of environmental pollution.
In the present embodiment, in described boiling type foam desulfurization and dedusting absorption tower 7, be provided with boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister; Foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister are existing structure, repeat no longer one by one herein.
In the present embodiment, described boiling type foam mass transfer elements arranges two-layer, ground floor foam member is from flue entrance top mark rise from being not less than 1m, second layer foam member is not less than 1.5m from ground floor spraying layer distance, between two layers of foam component, spacing is not less than 2m, described wall ring arranges 1 ~ 3 layer, wall ring width is not less than 200mm, described slurries spraying layer is intersect 3 ~ 5 layers that are dislocatedly distributed, described honeycomb fashion centrifugal demister arranges 1 ~ 2 layer, the centrifugal drift angle of demister blade is 30 °, every layer of demister arranges flushing water up and down respectively, demister outlet droplet concentration is less than 20mg/Nm
3, total pressure drag is less than 350Pa, by improving fume treatment effect to the position distribution of foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister, improve desulfurization dust-removing efficiency, flue gas is with demister intra vane rotating centrifugal, and every layer of demister arranges flushing water up and down respectively, described wet scrubber can select tubular type and board-like two kinds of forms, preferential employing and absorption tower integral arrangement, wet scrubber import and export arranges airflow uniform distribution device, wet scrubber power acquisition constant flow high pressure power supply, cathode line adopts needle-penetrating, flushing water system adopts indirect backwashing manner, washing time interval 24h.
Embodiment one
A. coal-fired flue-gas is passed into low NO 1, first First air and fuel rapid mixing in precombustion chamber, fuel precombustion discharge volatile matter under cold and oxygen deficient environment, thus reduce NO
xgeneration; Spray demercuration adsorbent to the flue gas processed through low NO 1 by demercuration adsorbent spraying system 2, the bromination active carbon that adsorbent selects oxidability strong, eject position is that boiler furnace sprays;
B. mixed through the sulfur trioxide absorption agent after atomization by the flue gas of demercuration process and carry out de-sulfur trioxide process, described sulfur trioxide absorption agent is the mass fraction of sodium carbonate and distillation demineralized water composition is the sodium carbonate liquor of 10%; The solvent of obtain solution adopts power plant's distillation demineralized water, the optional SCR denitration system of eject position of sodium carbonate liquor imports and exports flue, air preheater exhaust pass, wet desulphurization absorption tower gas approach, sodium carbonate liquor sprays to adopt and sprays grid or twin spray gun, and the atomized spray coverage rate of sodium carbonate liquor is not less than 160%; Absorbent solution storage facilities and conveyance conduit should take certain heating and thermal insulation measure, control sodium carbonate liquor temperature at 30 DEG C; During sodium carbonate liquor spraying system employing twin lance ejection, corresponding cooling protection wind should be set, prevent sodium carbonate liquor from not spraying front solidification;
C. after the flue gas after denitration process being carried out waste heat recovery after low low temp. electric dust removal process more first after process through boiling type foam desulfurization and dedusting and wet electrical dust precipitator 8 and the absorption tower 9 that is communicated with wet electrical dust precipitator exhaust pass; The entrance flue gas temperature of low low temp. electric dedusting is 85 DEG C, and flue gas ratio resistance is 10
10Ω cm
Select Teflon plastic heat exchanger, corrosion resistance is strong, and exchange capability of heat is large, degree of depth Mist heat recovering data, reduces flue-gas temperature, makes SO
3aggegation, on flue dust surface, removes after entering electric precipitation, improves SO
3removal efficiency; Boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister is provided with in described boiling type foam desulfurization and dedusting absorption tower 7; Described boiling type foam mass transfer elements arranges two-layer, ground floor foam member is from flue entrance top mark rise from being 2m, second layer foam member is 2.5m from ground floor spraying layer distance, between two layers of foam component, spacing is 2m, described wall ring arranges 3 layers, wall ring width is 200mm, described slurries spraying layer is intersect 5 layers that are dislocatedly distributed, described honeycomb fashion centrifugal demister arranges 2 layers, the centrifugal drift angle of demister blade is 30 °, every layer of demister arranges flushing water up and down respectively, and demister outlet droplet concentration is less than 20mg/Nm
3, total pressure drag is less than 350Pa; Flue gas is with demister intra vane rotating centrifugal, and every layer of demister arranges flushing water up and down respectively; Described wet scrubber can select tubular type and board-like two kinds of forms, preferential employing and absorption tower integral arrangement, wet scrubber import and export arranges airflow uniform distribution device, wet scrubber power acquisition constant flow high pressure power supply, cathode line adopts needle-penetrating, flushing water system adopts indirect backwashing manner, washing time interval 24h.
Embodiment two
A. coal-fired flue-gas is passed into low NO 1, first First air and fuel rapid mixing in precombustion chamber, fuel precombustion discharge volatile matter under cold and oxygen deficient environment, thus reduce NO
xgeneration; Spray demercuration adsorbent to the flue gas processed through low NO 1 by demercuration adsorbent spraying system 2, the bromination active carbon that adsorbent selects oxidability strong, eject position is that boiler furnace sprays;
B. mixed through the sulfur trioxide absorption agent after atomization by the flue gas of demercuration process and carry out de-sulfur trioxide process, described sulfur trioxide absorption agent is the mass fraction of sodium carbonate and distillation demineralized water composition is the sodium carbonate liquor of 30%; The solvent of obtain solution adopts power plant's distillation demineralized water, the optional SCR denitration system of eject position of sodium carbonate liquor imports and exports flue, air preheater exhaust pass, wet desulphurization absorption tower gas approach, sodium carbonate liquor sprays to adopt and sprays grid or twin spray gun, and the atomized spray coverage rate of sodium carbonate liquor is not less than 150%; Absorbent solution storage facilities and conveyance conduit should take certain heating and thermal insulation measure, control sodium carbonate liquor temperature at 50 DEG C; During sodium carbonate liquor spraying system employing twin lance ejection, corresponding cooling protection wind should be set, prevent sodium carbonate liquor from not spraying front solidification;
C. after the flue gas after denitration process being carried out waste heat recovery after low low temp. electric dust removal process more first after process through boiling type foam desulfurization and dedusting and wet electrical dust precipitator 8 and the absorption tower 9 that is communicated with wet electrical dust precipitator 8 exhaust pass; The entrance flue gas temperature of low low temp. electric dedusting is 95 DEG C, and flue gas ratio resistance is 10
11Ω cm; Select Teflon plastic heat exchanger, corrosion resistance is strong, and exchange capability of heat is large, degree of depth Mist heat recovering data, reduces flue-gas temperature, makes SO
3aggegation, on flue dust surface, removes after entering electric precipitation, improves SO
3removal efficiency; Boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister is provided with in described boiling type foam desulfurization and dedusting absorption tower 7; Described boiling type foam mass transfer elements arranges two-layer, ground floor foam member is from flue entrance top mark rise from being 1m, second layer foam member is 2m from ground floor spraying layer distance, between two layers of foam component, spacing is 2.5m, described wall ring arranges 1 layer, wall ring width is 220mm, described slurries spraying layer is intersect 5 layers that are dislocatedly distributed, described honeycomb fashion centrifugal demister arranges 1 layer, the centrifugal drift angle of demister blade is 30 °, every layer of demister arranges flushing water up and down respectively, and demister outlet droplet concentration is less than 20mg/Nm
3, total pressure drag is less than 350Pa; Flue gas is with demister intra vane rotating centrifugal, and every layer of demister arranges flushing water up and down respectively; Described wet scrubber can select tubular type and board-like two kinds of forms, preferential employing and absorption tower integral arrangement, wet scrubber import and export arranges airflow uniform distribution device, wet scrubber power acquisition constant flow high pressure power supply, cathode line adopts needle-penetrating, flushing water system adopts indirect backwashing manner, washing time interval 24h.
Embodiment three
A. coal-fired flue-gas is passed into low NO 1, first First air and fuel rapid mixing in precombustion chamber, fuel precombustion discharge volatile matter under cold and oxygen deficient environment, thus reduce NO
xgeneration; Spray demercuration adsorbent to the flue gas processed through low NO 1 by demercuration adsorbent spraying system 2, the bromination active carbon that adsorbent selects oxidability strong, eject position is that boiler furnace sprays;
B. mixed through the sulfur trioxide absorption agent after atomization by the flue gas of demercuration process and carry out de-sulfur trioxide process, described sulfur trioxide absorption agent is the mass fraction of sodium carbonate and distillation demineralized water composition is the sodium carbonate liquor of 20%; The solvent of obtain solution adopts power plant's distillation demineralized water, the optional SCR denitration system of eject position of sodium carbonate liquor imports and exports flue, air preheater exhaust pass, wet desulphurization absorption tower gas approach, sodium carbonate liquor sprays to adopt and sprays grid or twin spray gun, and the atomized spray coverage rate of sodium carbonate liquor is not less than 150%; Absorbent solution storage facilities and conveyance conduit should take certain heating and thermal insulation measure, control sodium carbonate liquor temperature at 40 DEG C; During sodium carbonate liquor spraying system employing twin lance ejection, corresponding cooling protection wind should be set, prevent sodium carbonate liquor from not spraying front solidification;
C. after the flue gas after denitration process being carried out waste heat recovery after low low temp. electric dust removal process more first after process through boiling type foam desulfurization and dedusting and wet electrical dust precipitator 8 and the absorption tower 9 that is communicated with wet electrical dust precipitator 8 exhaust pass; The entrance flue gas temperature of low low temp. electric dedusting is 90 DEG C, and flue gas ratio resistance is 10
10Ω cm; Select Teflon plastic heat exchanger, corrosion resistance is strong, and exchange capability of heat is large, degree of depth Mist heat recovering data, reduces flue-gas temperature, makes SO
3aggegation, on flue dust surface, removes after entering electric precipitation, improves SO
3removal efficiency; Boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister is provided with in described boiling type foam desulfurization and dedusting absorption tower 7; Described boiling type foam mass transfer elements arranges two-layer, ground floor foam member is from flue entrance top mark rise from being 1.5m, second layer foam member is 2.5m from ground floor spraying layer distance, between two layers of foam component, spacing is 2.5m, described wall ring arranges 2 layers, wall ring width is 250mm, described slurries spraying layer is intersect 4 layers that are dislocatedly distributed, described honeycomb fashion centrifugal demister arranges 2 layers, the centrifugal drift angle of demister blade is 30 °, every layer of demister arranges flushing water up and down respectively, and demister outlet droplet concentration is less than 20mg/Nm
3, total pressure drag is less than 350Pa; Flue gas is with demister intra vane rotating centrifugal, and every layer of demister arranges flushing water up and down respectively; Described wet scrubber can select tubular type and board-like two kinds of forms, preferential employing and absorption tower integral arrangement, wet scrubber import and export arranges airflow uniform distribution device, wet scrubber power acquisition constant flow high pressure power supply, cathode line adopts needle-penetrating, flushing water system adopts indirect backwashing manner, washing time interval 24h.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. a coal-fired flue-gas multi-pollutant cooperative processing method, is characterized in that: comprise the following steps:
A. fuel flue gas is made to carry out demercuration process to flue gas after precombustion denitrification under cold and oxygen deficient environment;
B. by the flue gas of demercuration process after de-sulfur trioxide process again through denitration process;
C. by the flue gas after denitration process after low low temp. electric dust removal process more first after through boiling type foam desulfurization and dedusting and wet-esp process.
2. coal-fired flue-gas multi-pollutant cooperative processing method according to claim 1, is characterized in that: in step a, carries out demercuration process by mixing with flue gas after the atomization of bromination acticarbon.
3. coal-fired flue-gas multi-pollutant cooperative processing method according to claim 1, it is characterized in that: in step b, carry out de-sulfur trioxide process by mixing with flue gas after sulfur trioxide absorption agent atomization, described sulfur trioxide absorption agent is the mass fraction of sodium carbonate and distillation demineralized water composition is the sodium carbonate liquor of 10 ~ 30%.
4. coal-fired flue-gas multi-pollutant cooperative processing method according to claim 3, is characterized in that: in step b, and the temperature of described sodium carbonate liquor is 30 DEG C ~ 50 DEG C; The atomized spray coverage rate of described sodium carbonate liquor is not less than 150%.
5. coal-fired flue-gas multi-pollutant cooperative processing method according to claim 1, is characterized in that: in step b, adopts the denitration of CR Selective catalytic reduction to carry out denitration process to flue gas, described catalyst to SO2 conversion ratio not higher than 1%.
6. coal-fired flue-gas multi-pollutant cooperative processing method according to claim 1, it is characterized in that: also comprise the flue gas before to low low temp. electric dust removal process and remove dust and sulfuric acid droplet further through waste heat recovery with to the flue gas after wet-esp process, the entrance flue gas temperature of described low low temp. electric dedusting is 85 ~ 95 DEG C, and flue gas ratio resistance is 10
10~ 10
11Ω cm.
7. the coal-fired flue-gas multi-pollutant coprocessing system according to right 1, it is characterized in that: comprise low NO, demercuration adsorbent spraying system, sulfur trioxide remove system and desulfur denitrate dust collecting system, fuel carries out demercuration process through demercuration adsorbent spraying system after low NO burning process, then removes after system removes sulfur trioxide through sulfur trioxide and enters desulfur denitrate dust collecting system.
8. coal-fired flue-gas multi-pollutant coprocessing system according to claim 7, it is characterized in that: described desulfur denitrate dust collecting system comprises SCR denitration device, low low temp. electric deduster, boiling type foam desulfurization and dedusting absorption tower and wet electrical dust precipitator and the absorption tower be communicated with wet electrical dust precipitator exhaust pass, the flue gas removing system process through sulfur trioxide enters boiling type foam desulfurization and dedusting absorption tower and carries out two-stage dust removal and desulfurization process after low low temp. electric deduster carries out primary dust removing, then carry out 3-stage dust-removal through wet electrical dust precipitator and absorption tower and remove the sulfuric acid droplet in flue gas, the gas approach of described low low temp. electric deduster is provided with residual neat recovering system.
9. coal-fired flue-gas multi-pollutant coprocessing system according to claim 8, is characterized in that: be provided with boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister in described boiling type foam desulfurization and dedusting absorption tower.
10. coal-fired flue-gas multi-pollutant coprocessing system according to claim 9, it is characterized in that: described boiling type foam mass transfer elements arranges two-layer, ground floor foam member is from flue entrance top mark rise from being not less than 1m, second layer foam member is not less than 1.5m from ground floor spraying layer distance, between two layers of foam component, spacing is not less than 2m, described wall ring arranges 1 ~ 3 layer, wall ring width is not less than 200mm, described slurries spraying layer is intersect 3 ~ 5 layers that are dislocatedly distributed, described honeycomb fashion centrifugal demister arranges 1 ~ 2 layer, the centrifugal drift angle of demister blade is 30 °, every layer of demister arranges flushing water up and down respectively, demister outlet droplet concentration is less than 20mg/Nm
3, total pressure drag is less than 350Pa.
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