CN103263832A - Method and system for decarburization through complete combustion of boiler as well as desulfurization, denitration and dust removal of exhaust gas - Google Patents

Method and system for decarburization through complete combustion of boiler as well as desulfurization, denitration and dust removal of exhaust gas Download PDF

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CN103263832A
CN103263832A CN2013100935423A CN201310093542A CN103263832A CN 103263832 A CN103263832 A CN 103263832A CN 2013100935423 A CN2013100935423 A CN 2013100935423A CN 201310093542 A CN201310093542 A CN 201310093542A CN 103263832 A CN103263832 A CN 103263832A
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gas
water
flue
ozone
dust
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黄世鲜
唐康健
陈意亮
刘白天
黄世荣
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黄世鲜
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention belongs to a technical field of atmospheric air control and treatment of exhaust gas from coal fired boilers and relates to a method and a system for decarburization through complete combustion as well as desulfurization, denitration and dust removal of exhaust gas. The method for the invention includes the decarburization of 30% oxygen-rich gas in combustion. The invention also includes that sulfur trioxide as well as other mixed acid are formed in a reaction of 30%ozone-rich gas and sulfur dioxide and nitrogen oxides in exhaust gas with water containing PX purified liquid. Exhaust gas which is treated through desulfurization and denitration is soaked into a 100 nm-500 nm wet nano filter in water containing PX purified liquid for removal of PM 2.5 dust particles. Advantages: the decarburization through complete combustion is promoted by oxygen-rich gas and the desulfurization and denitration is promoted by ozone-rich gas. A wet nano filter is used for removal of PM 2.5 dust particles. Reaction products are acid liquid and superfine powder particles which can be used in industry and civil application. No desulfurized gypsum is generated and no sulfide or nitrides will be discharged. Thus the formation of atmospheric acid rain can be prevented; pollutions of PM 2.5 dust to atmospheric air can be solved through the dust removal. Collected 2.5 Mu m dust can be applied in an industrial material field as a material. Therefore, purposes of mineral resource saving and turning waste into wealth can be reached.

Description

The method and system of charcoal and flue gas desulfurization denitration dust-removing is taken off in boiler completing combustion
Technical field
The invention belongs to atmospheric air and administer and the fire coal boiler fume processing technology field, particularly relate to the method and system to the desulfur denitrate dust collecting of flue gas.
Background technology
The Chinese patent application CN200610053090.6 of Zhejiang University " coal-burning boiler fume ozone oxidation and simultaneous desulfurization denitrification apparatus and method thereof " discloses a kind of coal-burning boiler fume ozone oxidation and simultaneous desulfurization denitrification apparatus and method thereof.Method may further comprise the steps: 1) 110~150 ℃ of low-temperature zone spray into ozone O before or after the electrostatic precipitator 5 of boiler flue 4 3The nitrogen oxide molar ratio that sprays in ozone and the boiler smoke is 0.5~1.5, water-fast lower valency nitrogen oxide in the boiler smoke is oxidized into high valence state nitrogen oxide soluble in water, and oxidizing sulfur dioxide generates sulfur trioxide, and the reaction time was at least 0.5 second; 2) will send into alkali liquid washing tower 7 through the boiler smoke that previous step is handled, in the alkali liquid washing tower, flue gas be washed, absorb high valence state nitrogen oxide and oxysulfide in the flue gas simultaneously.
This invention weak point one is to feed flue with the 21% concentration of ozone gas that contains that the normal air that only contains 21% oxygen is made, and is effective not as 30% concentration of ozone gas cyaniding to the oxidation effectiveness of the sulfide in the flue gas in the flue and nitride; The 2nd, the flue-gas temperature that ozone gas feeds the flue position is 110~150 ℃ of low-temperature zone, also makes ozone effective not as the strong ozone that 500~600 ℃ of high temperature section contain ozone 30% to the oxidation effectiveness of the sulfide in the flue gas in the flue and nitride.Weak point also is to cause in the air pollution source sulfur dioxide and in alkali lye secondary pollution to increase cost, is turned waste into wealth and should make good use of not as low cost is prepared as product with the direct formation dilute sulfuric acid soluble in water of air pollution source sulfur dioxide.2.5 microns serial dust collections in the flue gas are not handled simultaneously, be prepared as superfine powdery material and be used for the such technological innovation means in industrial materials field.
Summary of the invention
It is more abundant to the purpose of this invention is to provide in boiler coal burning, nuisance such as sulfur compound, nitride not in the discharging flue gas can be removed the coal-fired gas processing method of PM2.5 series dust granules and the annexation of employed system equipment and equipment before discharging.
The method that charcoal and flue gas desulfurization denitration dust-removing are taken off in boiler completing combustion of the present invention thes contents are as follows:
In 500-600 ℃ of high-temperature flue gas discharge tube of boiler emission, add rich ozone gas, rich ozone gas is that weight ratio is the gas that contains 30% ozone gas, high-temperature flue gas and rich ozone gas in discharge tube, fully mix and effect after, it is drained in the water of the water reaction tower that contains PX type scavenging solution, make sulfur dioxide, nitride, rich ozone gas and water in the high-temperature flue gas carry out chemical reaction generation sulfuric acid nitric acid mix acid liquor, sulfur dioxide, nitride remove from high-temperature flue gas, are the ozone desulphurization denitration.Nitride in the high-temperature flue gas and carbon monoxide etc. also can with rich ozone gas and the water-soluble acid of water generates, nitride is removed from the high-temperature flue gas of boiler emission, carbon monoxide becomes carbon dioxide or carbonic acid, also has other to react with ozone gas and generates water-soluble material and all can remove from high-temperature flue gas in the ozone sweetening process; So the sulfuric acid solution of Chenging is actual here is the mixing material of multiple DDGS, or the mixed liquor of mixed acid and other material.Can be except the harmful substance of deenergizing with ozone gas and water manyly can not discharging of carrying out chemical reaction, contaminated environment in the ozone desulphurization denitration step.
The gas of back desulphurization denitration is entered wet method nanofilter in water, and filtered smoke gas becomes the dustless gas of no sulphur to airborne release, and the superfine powder slurry that filters out is dried by the superfine powder baker, i.e. dust removal by filtration.Gas through desulphurization denitration does not produce acid in this dust removal by filtration step, 100 nanometers~500 nanofilter are not caused harmful corrosion, so will carry out ozone desulphurization denitration step before the dust removal by filtration step.Also should remove thicker particle refuse with removing PM2.0~3.0 particulate filtration devices before this dust removal by filtration step.
This method can be used for the purified treatment of any coal-burning boiler institute smoke discharging, and significant especially for the purified treatment of coal-fired plant boiler institute smoke discharging can significantly reduce the coal-burning power plant to the pollution of environment, particularly prevents the following dust of PM2.5 ParticleWith the pollution of sulfur dioxide acid rain to air, soil environment.
2, according to claim 1, it is characterized in that: rich ozone gas to the input quantity in the discharge tube is: the molal quantity of ozone in the rich ozone gas: molal quantity sum=1.2~1.5 of sulfide and nitride in the discharge tube: 1.0.Except sulfide and nitride, also have other need consume ozone, so the molal quantity of ozone should be greater than the molal quantity sum of sulfide and nitride
3, according to claim 1 and 2, it is characterized in that: charge into oxygen rich gas in the combustion chamber of boiler, oxygen rich gas is that weight ratio is the oxygen rich gas that contains 30% oxygen, and coal can fully be burnt, reduce the discharging of imperfect combustion thing, be oxygen enrichment and take off charcoal.The oxygen rich gas that contains 30% oxygen is more conducive to coal than normal air and fully burns, and significantly reducing does not have clean-burning ultra-fine carbon oxide particle, reaches and takes off the charcoal purpose.
The present invention finishes that charcoal is taken off in boiler completing combustion and the employed system for content of flue gas desulfurization denitration dust-removing method is as follows:
(1) the oxygen enrichment converter connects coal-burning boiler and ozone generator, and the oxygen enrichment converter is to coal-burning boiler and ozone generator output oxygen rich gas, and oxygen rich gas is that weight ratio is the gas that contains 30% oxygen; The oxygen enrichment converter is communicated with coal-burning boiler and ozone generator, and oxygen rich gas is defeated by coal-burning boiler and ozone generator.The oxygen enrichment converter is that to make weight ratio be the oxygen rich gas that contains 30% oxygen to raw material with containing 21% normal air.
(2) coal-burning boiler connects flue, and the flue gas of coal-burning boiler is discharged from flue.Coal-burning boiler is to contain in the environment of oxygen rich gas of 30% oxygen in that weight ratio is arranged, coal is fully burnt, the coal smoke of burning is that flue gas is discharged from the flue that coal-burning boiler is communicated with, and the preceding high temperature section flue dust gas in the flue is that flue-gas temperature is 500-600 ℃ gas.
(3) ozone generator is communicated with flue, and the other end of flue is communicated with the multistage rotary dust collector of band nanometer film; Ozone generator is weight ratio that to become weight ratio be the rich ozone gas that contains 30% ozone gas for the oxygen rich gas that contains 30% oxygen, ozone generator is defeated by rich ozone gas among the flue of 500-600 ℃ of high temperature section, in this flue, 500-600 ℃ of high-temperature smoke gas and rich ozone gas fully act on, after the sulfide in the flue dust gas and the abundant oxidation of nitride, carry out dedusting among the multistage rotary dust collector of input tape nanometer film.Under the 500-600 ℃ of condition, the abundant oxidation of sulfide and nitride refers to the low price sulphion is oxidized to the high price sulphion, as being oxidizing sulfur dioxide sulfur trioxide, so that sulfur trioxide and water chemistry reaction become sulfuric acid.In like manner be used for the abundant oxidation of nitride, become nitric acid with the water chemistry reaction.
(4) the top of the multistage rotary dust collector of band nanometer film is communicated with the water reaction tower with pipeline, and the following of the multistage rotary dust collector of band nanometer film is communicated with the thickness particle collector with pipeline; Filtering material in the multistage rotary dust collector of band nanometer film is particle filterings a large amount of in the flue dust gas, make the dust granules thing separated from the gas, dust granules thing gravitate drop to the band nanometer film multistage rotary dust collector below dust collection in, gas from the band nanometer film multistage rotary dust collector above enter the water reaction tower by pipeline.The effect of the multistage rotary dust collector of band nanometer film is material divided gas flow and the dust granules thing that filters.The dust granules of remaining a small amount of PM2.5 and so on is removed in follow-up wet method nanofilter.So, the above particulate filtration material of the most handy PM10.0 of removing of multistage rotary dust collector of band nanometer film and three grades of difference dedustings successively of filtering material of removing PM2.0~3.0 dust granules such as grade.
(5) the water reaction tower is communicated with scavenging solution adjuster and wet method nanofilter, mixed acid liquid pool and drier respectively;
The water of PX type scavenging solution is housed in the water reaction tower, is soaked with the porous water-permeable pipe in the water, the porous water-permeable pipe is the pipeline that tube wall has a large amount of apertures; Porous water-permeable pipe one end connects electric cleaner, and the porous water-permeable pipe other end is communicated with the wet method nanofilter; High-temperature smoke gas in the porous water-permeable pipe and rich ozone gas contain in the water reaction tower in the water of PX type scavenging solution and produce chemical reaction, and wherein sulfur dioxide, ozone gas and scavenging solution water carry out chemical reaction and produces dilute sulfuric acid; Dilute sulfuric acid in the water reaction tower is discharged into the mixed acid liquid pool to dilute sulfuric acid from the water reaction tower behind finite concentration; In the water reaction tower, the nitride in the flue dust gas is produced nitric acid by rich ozone oxidation and water reaction, and the sulfuric acid nitric acid liquid that the water reaction tower is collected all is the useful products material of industry agricultural.So be the mixture of multiple acid in the acid bath, i.e. mixed acid liquid pool.
Gas in the water reaction tower in the porous water-permeable pipe is defeated by the wet method nanofilter, also is through being defeated by the wet method nanofilter by the gas after the water dedusting in the water reaction tower; So that further dedusting.
After the scavenging solution of in the water reaction tower, adorning and water and the effect of flue dust gas, also be dissolved with the ultrafine dust particle in the flue dust gas in the water, form the ultrafine dust underflow, below the water reaction tower, through piping underflow is discharged into baker.Baker is discharged into oneself dry thing in the gatherer and stores.
(6) escape pipe of wet method nanofilter is communicated with chimney, and the grout outlet below the wet method nanofilter is communicated with the superfine powder baker; What the escape pipe of wet method nanofilter was discharged into chimney is dustless no sulphur flue gas, and the superfine powder baker is micro-nano powder with the fine dust slurry oven dry of wet method nanofilter.Be dustless no sulphur flue gas through the gas after the nanofilter in the wet method nanofilter water, this nanofilter is with the nanometer film stacked laminator filtration of 100 nanometers~500 nanometers, but the dustless no sulphur flue gas gas that is exactly the safety dumping of very environmental protection then.Nanofilter is filtering material with the nanometer film of 100 nanometers~500 nanometers, make the soot dust granule path nanofiltration filtration of material that is removed PM5.0, PM2.0~3.0, also removed the gas of dirt by the water reaction tower, use the nano-film filtration of 100 nanometers~500 nanometers again, remove micro/nano level dust granules more micro-in the more preceding step, make the last chimney of its coal-burning boiler not discharge harmful dust granules such as PM2.5, particularly solve the PM2.5 dust dust granules of coal-burning power plant to the pollution of air.Through the nano-film filtration of 100 nanometers~500 nanometers and the micro-nano powder that obtains is rare, valuable micro-nano powder material, these micro-nano powder materials are the ceramic powders through the boiler high temperature sintering, chemical property and shape and structure are highly stable, and this micro-nano powder material has very high economic worth.
5, according to claim 4, it is characterized in that: the nanofilter in the described wet method nanofilter is that the micropore size is the stacked device of the filter membrane of 100 nanometers~500 nanometers.
6, the system of boiler completing combustion decarburization according to claim 1 and flue gas desulfurization denitration dust-removing is characterized in that: described PX1, PX2... type scavenging solution are at least a in the liquid such as water, ethanol, ethylene glycol, propyl alcohol.
Advantage of the present invention:
(1) oxygen enrichment promotes completing combustion: make strong oxidizer with the oxygen enrichment of content 30% and replace always directly with 21% the abundant fuel of oxygen promotion coal in the air, make the oxygen enrichment of 99% coal combustible and 30% can burn more thoroughly, safer.Can improve the utilization rate of fuel significantly, can shorten burning time again more than 80%, can also fundamentally eliminate the toxic and harmfuls such as carbon monoxide that produce in the fuel combustion.
(2) rich ozone desulfurization, denitrogenation and removal of carbon monoxide: because ozone has extremely strong oxidisability, the ozone of content 30% can be direct oxidation into CO2, NO2, H2OS4 and SO3 to the toxic and harmfuls such as CO, NO, H2S and SO2 that fuel is got rid of after burning.And being dissolved in (H2O) water, NO2 and SO3 become acid solution.Above-mentioned have the poison gas thing by strong oxidation after, have only CO2 and H2O from tail gas, to discharge.This has just fundamentally eliminated CO in the boiler of power plant flue, NO, toxic and harmfuls such as H2S and SO2 and reach, clean, efficiently, the energy-saving and environmental protection purpose.Can be reduced into small-sized water treatment desulfuring and denitrifying apparatus to the large-scale desulfurization of gypsum device of present power plant like this.Water treatment desulphurization denitration apparatus of the present invention is got large-scale desulfurization of gypsum device and the large-scale denitrification apparatus that has replaced the high big investment of power plant, has solved former desulfurization of gypsum byproduct---the environmental pollution again of sulfur-bearing gypsum.Simultaneously, rare nitric acid and dilute sulfuric acid that NO2 soluble in water and SO3 are produced can be used in the industrial and agricultural products, thoroughly solve the formation of acid rain in the air, reach the purpose that purifies air, preserves our planet, protects environment for human survival.
(3) three complete equipment classification dedustings solve the PM2.5 dust pollution: with multistage rotary dust collector, the water reaction tower that PX type scavenging solution is housed, wet method nanofilter three complete equipments of band nanometer film, press dust and can the grain size divide PM10.0, PM5.0, the multistage dedusting of PM2.5 to solve the PM2.5 dust pollution.And collect the micro-nano powder that acquisition has the PM2.5 micron level of very high economic worth, realize pollution treatment and two Luo that make a profit.The PM2.5 that thoroughly solves boiler rich anies influential family such as power plant administers a difficult problem.Reach the saving mineral resources, comprehensive utilization coal-burning boiler rich and influential family's discarded object is also turned waste into wealth, and cleaning, environmental protection, circulation, high added value, forms high-tech environmental protection industry cluster development model fast.
(4) rich ozone is to solve that PM2.5 dust is low-cost to be guaranteed: be the low-cost oxidant of removing poisonous oxide with containing 30% rich ozone desulfurization, denitrogenation and removal of carbon monoxide etc., directly to react its operating cost minimum with rich ozone oxidation agent in water for water.Also solve the problem that the nano-film filtration device of 100 nanometers~500 nanometers is not corroded, make to be worth PM2.5 dust that expensive nano-film filtration device is used for removing coal smoke to have a cost low the assurance that economic worth is high.
(5) be that also with present power plant emission air pollution source sulfur dioxide, with sulfur dioxide formation dilute sulfuric acid soluble in water, dilute sulfuric acid also can be prepared as industrial products and be applied with native system.Be that superfine spherical microballon material is used for the such technological innovation means in industrial materials field simultaneously with the PM2.5 dust collection Processing of Preparation in the flue gas.
(6) adopt oxygen content to be higher than 21% oxygen rich gas and make combustion adjuvant, 99% combustible is thoroughly burnt, and shorten burning time more than 80%.
(7) the flue feeding weight ratio in 500~600 ℃ of zones of coal-fired plant boiler smoke evacuation outlet is the rich ozone gas that contains 30% ozone, efficiently with oxidizing sulfur dioxide is soluble in water become sulfur trioxide after, enter the sulfuric acid of being dissolved into high added value in the water treatment facilities of rear end, simultaneously, also tackle 500~600 ℃ of regional temperature section flues and transform, avoiding 30% ozone with high concentration effectively is that oxygen rich gas is fed back into the unsafe factors such as blast that conflagration causes in 1400~2100 ℃ of high temperature pot thoraxes.
Relevant knowledge of the present invention: no matter being to use in the air 21% oxygen to make combustion adjuvant, also being to use 30% oxygen to make combustion adjuvant, all is to belong to " Combustion " theoretical category.In the oxidation of emitting light and heat (burning) process, the air burning of 99% combustible and oxygenous amount 21% is incomplete, cause the utilization rate deficiency of coal fuel, carbon, sulfide, nitride etc. produce toxic and harmful and PM2.5 dust granules such as a large amount of CO, NO, H2S, SO2 behind imperfect combustion.Atmospheric environment is caused severe contamination, and the harm people's is healthy.The gas of 30% oxygen concentration exceeds 9% than 21% oxygen concentration in the air.The ozone of content 30% belongs to strong oxidizer, and the oxidisability of its ratio content 30% oxygen is much better than.CO, NO, H2S, SO2 hot gas in this external high-temperature flue discharged flue gas, can by the ozone in content 30% ozone gas directly, be completely oxidized to CO2, NO2, SO3, the wherein water-soluble sulfuric acid that can be made into high added value of SO3.CO2 and H2O discharge from tail gas.Reach the purpose of cleaning, efficient, energy-saving and environmental protection.One cover is transformed the device of coal-fired station's integral loop insurance system, and it comprises the modernization system such as interpolation of the using instead of the stove hall temperature of having transformed coal-fired station's combustion furnace, incendiary agent, oxygen enrichment agent.Simultaneously, integral loop insurance system of the present invention is got the desulfurizer that has replaced coal-fired station, denitrification apparatus and dust arrester and carbon removal device.Apparatus of the present invention integral loop insurance system is that the integral loop insurance system saving of coal-fired station is invested more than 50%, saves occupation area of equipment 2/3rds, saves operating cost more than 60%.
The content that the invention belongs to reported first is that 30% oxygen rich gas is applied to carry out in the coal-burning boiler completing combustion and takes off charcoal, content is 30% ozone oxidation reaction in flue gas, when mixed flue gas places the water desulphurization denitration to take off impurity, remove the environmental protection model technology of PM2.5 ultrafine dust particle, have science, novelty and originality.
Description of drawings
Fig. 1 is each equipment connecting relation of the present invention and equipment component structural representation.
Fig. 2 is the multistage dedusting structure schematic diagram of band nanometer film of the present invention.
The specific embodiment
Method and the employed system of charcoal and flue gas desulfurization denitration dust-removing taken off in embodiment 1, boiler completing combustion
As Fig. 1,
(1) method of charcoal and flue gas desulfurization denitration dust-removing is taken off in boiler completing combustion
1, the method for charcoal is taken off in boiler completing combustion: charge into oxygen rich gas in the combustion chamber of boiler, oxygen rich gas is that weight ratio is the oxygen rich gas that contains 30% oxygen, and coal can fully be burnt, and reduces the discharging of imperfect combustion thing, is oxygen enrichment and takes off charcoal.
2, the method of flue gas desulfurization and denitrification: in 500-600 ℃ of high-temperature flue gas discharge tube of boiler emission, add rich ozone gas, rich ozone gas is that weight ratio is the gas that contains 30% ozone gas, high-temperature flue gas and rich ozone gas in discharge tube, fully mix and effect after, it is drained in the water of the water reaction tower that contains PX type scavenging solution, make the sulfur dioxide in the high-temperature flue gas, nitride and rich ozone gas and scavenging solution water carry out chemical reaction and produce sulfuric acid nitric acid, because sulfuric acid nitric acid is soluble in water, sulfur dioxide and nitrogen oxide remove from flue gas, are the ozone desulphurization denitration.Rich ozone gas to the input quantity in the discharge tube is: the molal quantity of ozone in the rich ozone gas: molal quantity sum=1.2~1.5 of sulfide and nitride in the discharge tube: 1.0.
3, flue gas removes the method for PM2.5 dust: the gas of back desulphurization denitration is fed wet method nanofilter under water, and the gas of filtration has become the dustless flue gas of no sulphur and has been discharged.The superfine powder slurry that filters out is dried by the superfine powder baker, i.e. dust removal by filtration.The wet method nanofilter is that the micropore size is the nanometer film stacked laminator of 100 nanometers~500 nanometers.
(2) finish boiler completing combustion and take off charcoal and each equipment of the employed system of flue gas desulfurization denitration dust-removing method and annexation thereof
(1) the oxygen enrichment converter connects coal-burning boiler and ozone generator, and the oxygen enrichment converter is to coal-burning boiler and ozone generator output oxygen rich gas, and oxygen rich gas is that weight ratio is the gas that contains 30% oxygen; The oxygen enrichment converter is communicated with coal-burning boiler and ozone generator, and oxygen rich gas is defeated by coal-burning boiler and ozone generator.Oxygen enrichment converter air is that to make weight ratio be the oxygen rich gas that contains 30% oxygen to raw material.
(2) coal-burning boiler connects flue, and the flue gas of coal-burning boiler is discharged from flue.Coal-burning boiler is to contain in the environment of oxygen rich gas of 30% oxygen in that weight ratio is arranged, coal is fully burnt, the coal smoke of burning is that flue gas is discharged from the flue that coal-burning boiler is communicated with, and the high-temperature smoke gas of preposition pipeline is that flue-gas temperature is 500-600 ℃ gas in the flue.
(3) ozone generator is communicated with flue, and the other end of flue is communicated with the multistage rotary dust collector of band nanometer film; Ozone generator is weight ratio that to become weight ratio be the rich ozone gas that contains 30% ozone gas for the oxygen rich gas that contains 30% oxygen, ozone generator is defeated by rich ozone gas among the flue of 500-600 ℃ of high temperature section, in this flue, 500-600 ℃ of high-temperature smoke gas and rich ozone gas fully act on, after the sulfide in the flue dust gas and the abundant oxidation of nitride, carry out dedusting among the multistage rotary dust collector of input tape nanometer film.Under the 500-600 ℃ of condition, the abundant oxidation of sulfide and nitride refers to the low price sulphion is oxidized to the high price sulphion, as being oxidizing sulfur dioxide sulfur trioxide, so that sulfur trioxide and water chemistry reaction become sulfuric acid.In like manner be used for the abundant oxidation of nitride, become nitric acid with the water chemistry reaction.
(4) the top of the multistage rotary dust collector of band nanometer film is communicated with the water reaction tower with pipeline, and the following of the multistage rotary dust collector of band nanometer film is communicated with the thickness particle collector with pipeline; Filtering material in the multistage rotary dust collector of band nanometer film is particle filterings a large amount of in the flue dust gas, make particle separated from the gas, the particle gravitate drop to the band nanometer film multistage rotary dust collector below the thickness particle collector in, gas from the band nanometer film multistage rotary dust collector above enter the water reaction tower by pipeline.The effect of the multistage rotary dust collector of band nanometer film is porose material divided gas flow and particle, and the particle in the flue dust gas varies, and the classification dedusting.The dust ultra-fine grain of remaining a small amount of PM2.5 is removed in follow-up wet method nanofilter.
(5) the water reaction tower is communicated with scavenging solution adjuster and wet method nanofilter, mixed acid liquid pool and drier respectively;
The water that contains PX type scavenging solution is housed in the water reaction tower, is soaked with the porous water-permeable pipe in the water, the porous water-permeable pipe is the pipeline that tube wall has a large amount of apertures; Porous water-permeable pipe one end is communicated with the multistage rotary dust collector of band nanometer film, and the porous water-permeable pipe other end is communicated with the wet method nanofilter; High-temperature smoke gas and rich ozone gas in the porous water-permeable pipe produce chemical reaction in the water of water reaction tower, wherein sulfur dioxide, ozone gas and scavenging solution water carry out chemical reaction generation dilute sulfuric acid; Dilute sulfuric acid in the water reaction tower is discharged into the mixed acid liquid pool to dilute sulfuric acid from the water reaction tower behind finite concentration; In the water reaction tower, the nitride in the flue dust gas is oxidized to produce nitric acid with the reaction of scavenging solution water, and sulfuric acid nitric acid liquid all is the chemical reactant that is conducive to industrial and agricultural production.So be the mixture of multiple acid in the acid bath, i.e. mixed acid liquid pool.
Gas in the water reaction tower in the porous water-permeable pipe is defeated by the wet method nanofilter, also is to be defeated by the wet method nanofilter through the gas that is cleaned in the water reaction tower after the dedusting of liquid water; So that further dedusting.
Behind the PX type scavenging solution water of in the water reaction tower, adorning and the effect of flue dust gas, also be dissolved with the superfine particulate matter in the flue dust gas in the water, form underflow, below the water reaction tower, through piping underflow is discharged in the baker.Oven dry is discharged into oneself dry thing in the gatherer and stores.
(6) escape pipe of wet method nanofilter is communicated with chimney, and the grout outlet below the wet method nanofilter is communicated with the superfine powder baker; What the escape pipe of wet method nanofilter was discharged into chimney is dustless no sulphur clean air, but the dustless no sulphur flue gas gas that is exactly the safety dumping of very environmental protection then.The superfine powder baker is micro-nano powder with the fine dust slurry oven dry of wet method nanofilter.This nanofilter is filtered with the nanometer film stacked laminator of 100 nanometers~500 nanometers, nano-film filtration with 100 nanometers~500 nanometers, more micro-nanoscale dust granules in the step before removing, make the last chimney of its coal-burning boiler not discharge harmful dust granules of PM2.5, particularly solve the PM2.5 dust granules of coal-burning boiler to the pollution of atmospheric air.Through the nano-film filtration of 100 nanometers~500 nanometers and the micro-nano powder that obtains is rare, valuable micro-nano powder material, these micro-nano powders are the ceramic particles through the boiler high temperature sintering, its chemical property and shape and structure are highly stable, and this micro-nano powder has very high economic worth.
Nanofilter in the described wet method nanofilter is that the micropore size is the stacked device of the filter membrane of 100 nanometers~500 nanometers, and this device is the filter of removing PM2.5 dust granules in the air.
Described PX1, PX2... type scavenging solution are at least a in the liquid such as water, ethanol, ethylene glycol, propyl alcohol.

Claims (6)

1. the method for charcoal and flue gas desulfurization denitration dust-removing is taken off in boiler completing combustion, it is characterized in that:
In 500-600 ℃ of high-temperature flue gas discharge tube of boiler emission, add rich ozone gas, rich ozone gas is that weight ratio is the gas that contains 30% ozone gas, high-temperature flue gas and rich ozone gas in discharge tube, fully mix and effect after, it is drained in the water of the water reaction tower that contains PX type scavenging solution, make nitrogen oxide and sulfur dioxide in the high-temperature flue gas soluble in water under rich ozone gas effect, oxidizing sulfur dioxide generates sulfur trioxide.Be ozone desulfurization denitration simultaneously;
The flue gas of back desulphurization denitration is entered wet method nanofilter in water, and the flue gas of filtration becomes the dustless gas discharging of no sulphur atmosphere, and the superfine powder that filters out slurry is become the superfine powder particle by the baker oven dry and is collected, i.e. dust removal by filtration.
2. the boiler completing combustion according to claim 1 method of taking off charcoal and flue gas desulfurization denitration dust-removing, it is characterized in that: rich ozone gas to the input quantity in the discharge tube is: the molal quantity of ozone in the rich ozone gas: molal quantity sum=1.2~1.5 of sulfide and nitride in the discharge tube: 1.0.
3. the boiler completing combustion according to claim 1 and 2 method of taking off charcoal and flue gas desulfurization denitration dust-removing, it is characterized in that: in the combustion chamber of boiler, charge into oxygen rich gas, oxygen rich gas is that weight ratio is the oxygen rich gas that contains 30% oxygen, coal can fully be burnt, reduce the discharging of imperfect combustion thing, be oxygen enrichment and take off charcoal.
4. finish boiler completing combustion and take off charcoal and the employed system of flue gas desulfurization denitration dust-removing method, it is characterized in that:
(1) the oxygen enrichment converter connects coal-burning boiler and ozone generator, and the oxygen enrichment converter is to coal-burning boiler and ozone generator output oxygen rich gas, and oxygen rich gas is that weight ratio is the gas that contains 30% oxygen; The oxygen enrichment converter is communicated with coal-burning boiler and ozone generator, and oxygen rich gas is defeated by coal-burning boiler and ozone generator;
(2) coal-burning boiler connects flue, and the flue gas of coal-burning boiler is discharged from flue;
(3) ozone generator is communicated with flue, and the other end of flue is communicated with the multistage rotary dust collector of band nanometer film; Ozone generator is weight ratio that to become weight ratio be the rich ozone gas that contains 30% ozone gas for the oxygen rich gas that contains 30% oxygen, ozone generator is defeated by rich ozone gas among the flue of 500-600 ℃ of high temperature section, in this flue, 500-600 ℃ of high-temperature smoke gas and rich ozone gas fully act on, after the sulfide in the flue dust gas and the abundant oxidation of nitride, carry out dedusting among the multistage rotary dust collector of input tape nanometer film;
(4) the top of the multistage rotary dust collector of band nanometer film is communicated with the water reaction tower with pipeline, and the following of the multistage rotary dust collector of band nanometer film is communicated with the thickness particle collector with pipeline; Filtering material in the multistage rotary dust collector of band nanometer film is particle filterings a large amount of in the flue dust gas, make particle separated from the gas, the particle gravitate drop to the band nanometer film multistage rotary dust collector below the thickness particle collector in, flue gas from the band nanometer film multistage rotary dust collector above enter the water reaction tower by pipeline;
(5) the water reaction tower is communicated with scavenging solution adjuster and wet method nanofilter, mixed acid liquid pool and drier respectively;
In the water reaction tower water is housed, is soaked with the porous water-permeable pipe in the water, the porous water-permeable pipe is the pipeline that tube wall has a large amount of apertures; Porous water-permeable pipe one end is communicated with the multistage rotary dust collector of scavenging solution adjuster and band nanometer film, and the porous water-permeable pipe other end is communicated with the wet method nanofilter; High-temperature smoke gas and rich ozone gas in the porous water-permeable pipe produce chemical reaction in the water of water reaction tower, wherein sulfur dioxide, nitrogen oxide, ozone gas and water carry out chemical reaction generation sulfuric acid mix acid liquor; Sulfuric acid nitric acid in the water reaction tower is discharged into the mixed acid liquid pool to nitric acid sulfuric acid from the water reaction tower behind finite concentration;
Gas in the water reaction tower in the porous water-permeable pipe is defeated by the wet method nanofilter;
After the water of in the water reaction tower, adorning and the effect of high-temperature smoke gas, also be dissolved with the particle of the PM2.5PM10 in the flue dust gas in the water, formation contains the underflow of ultra-fine hybrid particles, through piping the underflow that contains ultra-fine hybrid particles is discharged into drier below the water reaction tower;
(6) escape pipe of wet method nano-film filtration device is communicated with chimney, and the grout outlet below the wet method nano-film filtration device is communicated with the superfine powder baker; What the escape pipe of wet method nanofilter was discharged into chimney is dustless sweet gas body, and baker is micro-nano powder with the ultrafine dust slurry oven dry that wet method nano-film filtration device filters.
5. according to claim 4ly finish boiler completing combustion and take off charcoal and the employed system of flue gas desulfurization denitration dust-removing method, it is characterized in that: the nano-film filtration device in the described wet method nanofilter is that the micropore size is the stacked device of the filter membrane of 100 nanometers~500 nanometers.
6. the system of boiler completing combustion decarburization according to claim 1 and flue gas desulfurization denitration dust-removing is characterized in that: described PX1, PX2... type scavenging solution are at least a in the liquid such as water, ethanol, ethylene glycol, propyl alcohol.
CN2013100935423A 2013-03-22 2013-03-22 Method and system for decarburization through complete combustion of boiler as well as desulfurization, denitration and dust removal of exhaust gas Pending CN103263832A (en)

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CN201410086287.4A CN103816786A (en) 2013-03-22 2014-03-04 Method and system for boiler complete combustion decarburization and flue gas desulfurization dedusting
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CN105579116A (en) * 2013-09-25 2016-05-11 琳德股份公司 Methods for treating waste gas streams from incineration processes
CN109092018A (en) * 2018-08-13 2018-12-28 大同新成新材料股份有限公司 A kind of flue gas desulfurization and denitration method and device
CN109092018B (en) * 2018-08-13 2020-06-05 大同新成新材料股份有限公司 Flue gas desulfurization and denitrification device

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