CN106076095A - Mercury in flue gas and the control method of sulfur trioxide and device is removed based on electrostatic fabric filter - Google Patents
Mercury in flue gas and the control method of sulfur trioxide and device is removed based on electrostatic fabric filter Download PDFInfo
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- CN106076095A CN106076095A CN201610624013.5A CN201610624013A CN106076095A CN 106076095 A CN106076095 A CN 106076095A CN 201610624013 A CN201610624013 A CN 201610624013A CN 106076095 A CN106076095 A CN 106076095A
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- desulfurization wastewater
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- electrostatic fabric
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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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
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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Abstract
The invention discloses and a kind of remove mercury in flue gas and the control method of sulfur trioxide and device based on electrostatic fabric filter, first by the heavy metallic salt removed in the desulfurization wastewater flowed out by desulfurizing tower and float, and the ph value of desulfurization wastewater is regulated to the most alkaline；Then the desulfurization wastewater atomized spray after wastewater treatment equipment is internal in the flue (10) of electrostatic fabric filter gas approach, wherein, the granule after nebulizer (9) nozzle atomization evaporated before entering the bag district of electrostatic fabric filter completely；Desulfurization wastewater is bigger after spraying into flue improves the binding ability of flying dust and multi-pollutant in electrostatic fabric filter; utilize again the feature of electrostatic fabric filter Zhong Dai district's dedusting simultaneously; the collaborative efficiency improving the removing pollutant such as hydrargyrum, SO3, PM2.5 and stability; reduce demercuration cost, also can effectively protect filter bag.
Description
Technical field
The present invention relates to dedusting technology field, remove mercury in flue gas and three oxidations particularly to one based on electrostatic fabric filter
The control method of sulfur and device.
Background technology
Along with developing rapidly of modern industry, especially coal-burning power plant, metallurgy, mine, cement and the work such as chemical industry, casting
The development of industry, causes the severe contamination of China's air, the most also constrains China's expanding economy.Wherein, coal-burning power plant makes
The environmental pollution become becomes one of matter of utmost importance that is the most urgently to be resolved hurrily and that control.
The pollutant that coal-burning power plant is discharged mainly have flue dust, SOX、NOX, mercury and mercuric compounds etc..Wherein SO3Existence
The problems such as the formation that can cause the increase of burn into flue gas opacity of electric power factory equipment, acid rain.More can lead after being discharged in air
Cause respiratory tract disease.And hydrargyrum is bigger as the harm of a kind of toxic heavy metal, renal failure, infringement nervous system after poisoning, can be caused
Etc. serious consequence.Although the pollution problem that SO3 and hydrargyrum cause the most gradually starts to be subject to people's attention, but current domestic pin
Less to the emission-reduction technology of SO3 in coal-burning power plant and hydrargyrum.
In prior art, electrostatic fabric filter often uses activated carbon to strengthen the adsorption to hydrargyrum, although be also bound to SO3
There is adsorbing and removing effect.But activated carbon is for SO3Adsorption be more weak physical absorption, activated carbon is injected into cigarette
After in road, the longest with the incorporation time of flue gas, only physical absorption differs and makes SO surely3Concentration of emission be reduced to relatively low water
Flat.Meanwhile, spraying into of activated carbon, more can cause SO3Filter bag is enriched with, thus reduces life-span of the filter bag.And making of activated carbon
Higher with cost.
Further, the absorbability of activated carbon itself is certain, and SO3The most all there is stronger adsorbed energy with hydrargyrum
Power, can produce absorption competition phenomenon.For high-sulfur coal, the SO in flue gas3Content is higher, is more prone to be tightly held by activated carbon,
So must spray into more activated carbon to ensure demercuration efficiency, substantially increase the cost of demercuration.Meanwhile, more SO3 will
Being enriched on filter bag, be likely to result in the generation of filter bag burn into disrepair phenomenon, this causes traditional electrostatic fabric filter not to be suitable for height
Sulfur coal.
Therefore, it is necessary to optimize existing electrostatic fabric filter technology, improve electrostatic fabric filter dirty to the variety classes such as SO3, hydrargyrum
The removal efficiency of dye thing, expands the scope of application of electrostatic fabric filter, breaks existing electrostatic fabric filter technology limitation, reduces simultaneously
Industrial cost, to meet the requirement of modern industry economical and energy saving environmental protection.
Summary of the invention
The present invention provides a kind of and removes mercury in flue gas and the control method of sulfur trioxide, this controlling party based on electrostatic fabric filter
Method particularly as follows:
S1, the heavy metallic salt removed in the desulfurization wastewater flowed out by desulfurizing tower and float, and by the ph value of desulfurization wastewater
Regulation is to alkalescence；
S2, by the desulfurization wastewater atomized spray after wastewater treatment equipment in the flue of electrostatic fabric filter gas approach
Portion, wherein, the granule after atomizer nozzle is atomized evaporated before entering the bag district of electrostatic fabric filter completely.
Herein the ph value of desulfurization wastewater is regulated to alkalescence, the most again desulfurization wastewater is sprayed onto inside flue, alkalescence
Desulfurization wastewater be evaporated the villaumite of precipitation and hydroxide in flue with SO in flue gas3Carry out fully Deng acidic materials and mercury element
Contact, Elemental Mercury can be converted into oxidation state hydrargyrum by villaumite, improves the removal efficiency of hydrargyrum, and hydroxide can be with SO3Deng acid
Substance reaction generates sulfate, improves SO3Removal efficiency.And partly atomized granule and the fly ash granule collision in flue gas,
Separate out crystal salt after evaporation rapidly and hydroxide is attached on fly ash granule, make the ratio resistance of flying dust reduce, electricity bag can be improved
The efficiency of dust collection of cleaner unit.
The villaumite being attached on flying dust and hydroxide can increase hydrargyrum and SO on the basis of script physical absorption3More
The chemisorbed of stability and high efficiency, improves flying dust to hydrargyrum and SO3Binding ability, and then flying dust trapped by dedusting filtering bag, hydrargyrum with
SO3Also it is removed.
Partial drop, after ejection, can occur multiple impacts, collision rift, exhausted water from different fine particles such as PM2.5
Drip can combine with these trickle fly ash granules, after drop is evaporated rapidly, these trickle flying dusts will coalescence together,
Become bigger fly ash granule, thus be easier to be trapped by electrostatic fabric filter.Subsequently, hydrargyrum and SO have been adsorbed3Flying dust and waste water
Drop be evaporated after separate out crystallization major part electricity district be removed, another part electricity district charged after enter bag district, by filter bag with
Dust layer the most charged outside filter bag intercepts outside, is combined with original dust layer and forms new fluffy dust layer, new dust
Owing to having villaumite, hydroxide and bigger specific surface area on layer, stronger physical absorption and the ability of chemisorbed are permissible
Make it as last layer " filter membrane ", reduce hydrargyrum, SO3, the discharge of the various pollutant such as PM2.5.The cleaning cycle in bag district
Longer, it means that villaumite can be used more effectively with hydroxide.
Meanwhile, these dust all carrying hydroxide, these hydroxide can be with SO3It is neutralized anti-
Should, thus prevent filter bag by SO3Corrosion, extends the life-span of filter bag.Hydroxide in flue gas and SO3The sulphuric acid generated after reaction
Salt is for hydrargyrum and SO3Also there is stronger adsorption.Waste water be evaporated after product major part the most with flying dust by electricity district and bag
District traps, and therefore, the operation of desulfurizing tower will not be produced impact, cause the enrichment phenomenon of chlorine in desulfurization wastewater spray air-returen flue.And
And, the desulfurization wastewater atomizing particle in flue evaporated before entering bag district completely, will not produce paste bag phenomenon.
The method can make desulfurization wastewater and electrostatic fabric filter perfect adaptation, electrostatic fabric filter ensure villaumite not further into
On the premise of desulfurizing tower, bigger after desulfurization wastewater is sprayed into flue improve the knot of flying dust and multi-pollutant in electrostatic fabric filter
Conjunction ability, utilizes again the feature of electrostatic fabric filter Zhong Dai district's dedusting simultaneously, is greatly improved the removing pollutant such as hydrargyrum, SO3, PM2.5
Efficiency and stability, make electrostatic fabric filter reduce the straying quatity of activated carbon during removing multi-pollutant and even do not spray into
Activated carbon, efficient, the stable that can complete multi-pollutant remove.Meanwhile, existing electrostatic fabric filter demercuration is this method solved
The problem that efficiency is unstable and demercuration is relatively costly, also can effectively protect filter bag, extends life-span of the filter bag.
Optionally, step S1 particularly as follows:
S11, use calcium hydroxide to remove the heavy metallic salt in desulfurization wastewater, and regulate desulfurization wastewater ph value to 8-9；
S12, addition calcium oxide are by the ph value of desulfurization wastewater regulation further to 11-12.
Optionally, the atomizing particle grain size sprayed through described atomizer nozzle in described step S2 is less than or equal to
50μm。
Additionally, present invention also offers a kind of based on electrostatic fabric filter removal mercury in flue gas and the device of sulfur trioxide, bag
Include electrostatic fabric filter, also include with lower component:
Wastewater treatment equipment, for removing the heavy metallic salt in the desulfurization wastewater flowed out by desulfurizing tower and float, and will
The ph value regulation of desulfurization wastewater is to alkalescence；
Nebulizer, has the nozzle for being atomized by the desulfurization wastewater after wastewater treatment equipment, the spray of described nebulizer
Mouth is arranged at inside the flue of the gas approach connecting described electrostatic fabric filter, and the granule after atomization is entering electrostatic fabric filter
Bag district before evaporate completely.
Optionally, described wastewater treatment equipment includes with lower component:
Reaction tank, is arranged at the downstream of described desulfurizing tower, is loaded with to react with heavy metallic salt in desulfurization wastewater and generate and sinks
The alkaline solution formed sediment, through the ph value scope of the desulfurization wastewater of described reaction tank be: 8-9；
Depositing reservoir, is used for filtering desulfurization wastewater through float produced by described reaction tank, gives up obtaining the desulfurization of clarification
Water；
PH regulating reservoir, is arranged at the downstream of described depositing reservoir, the upstream of described nebulizer, is loaded with in described PH regulating reservoir
PH value Auto-regulator, described depositing reservoir the desulfurization wastewater flowed out flows through described PH regulating reservoir and carries out pH value regulation.
Optionally, described pH value Auto-regulator is calcium oxide, and the ph value of desulfurization wastewater after described calcium oxide regulates
In the range of: 11-12.
Optionally, the mixed solution that alkaline solution is calcium hydroxide and solvable inorganic salt contained in described reaction tank.
Optionally, the atomizing angle scope of described nebulizer 0 ° to 60 °, described nozzle is set up in parallel formation evaporating area, described
Evaporating area plane vertical flow of flue gas direction, the injection direction of described nozzle is along flow of flue gas direction.
Optionally, the atomizing particle grain size sprayed through described atomizer nozzle is less than or equal to 50 μm, and institute
State nozzle and be positioned at the flue end away from described electrostatic fabric filter.
Accompanying drawing explanation
Fig. 1 is to remove mercury in flue gas and the device schematic diagram of sulfur trioxide in detailed description of the invention；
Fig. 2 is to remove mercury in flue gas and the control method flow chart of sulfur trioxide in detailed description of the invention.
In Fig. 1:
PH regulating reservoir 1, depositing reservoir 2, reaction tank 3, chimney 4, desulfurizing tower 5, back-end ductwork 6, dedusting filtering bag district 7, prime electricity
Place 8, nebulizer 9, flue 10.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the present invention program, below in conjunction with control method, device, explanation
The present invention is described in further detail for book the drawings and specific embodiments.
The most in the lump referring to Fig. 1, Fig. 1 is to remove mercury in flue gas and sulfur trioxide based on electrostatic fabric filter in detailed description of the invention
Device schematic diagram.
The invention provides a kind of based on electrostatic fabric filter removal mercury in flue gas and the device of sulfur trioxide, remove including electricity bag
Dirt device, desulfurizing tower 5.Electrostatic fabric filter includes prime electric field region 8, dedusting filtering bag district 7, and prime electric field region 8 is provided with positive plate, the moon
Pole, negative electrode is for carrying out charged to the granule in flue gas, and positive plate primarily serves the purpose of and forms electric field with negative electrode, and acts the work that gathers dust
With.
After dedusting filtering bag district 7 is positioned at prime electric field region 8, it is provided with by the most regularly arranged filter bag.Generally dedusting filter
Being additionally provided with intermediate transition zone between bag district 7 and prime electric field region 8, be provided with import loudspeaker before prime electric field region 8, flue gas is certainly
Import loudspeaker enter the enclosure interior of electrostatic fabric filter, flow to through prime electric field region 8, intermediate transition zone, dedusting filtering bag district 7 successively
The exhanst gas outlet of electrostatic fabric filter, enters exterior line through exhanst gas outlet.Certainly, top, usual dedusting filtering bag district 7 is additionally provided with
Air-purifying chamber, the flue gas in dedusting filtering bag district 7 is flowed out by exhanst gas outlet after air-purifying chamber purifies again.
Wherein dedusting filtering bag district 7 can be primary dust removing bag, it is also possible to arrange multistage dust settling pocket.
Herein the internal structure of desulfurizing tower 5, operation principle can be same as the prior art, do not introduce at this.
Desulfurizing tower 5 can be arranged at the downstream of electrostatic fabric filter, and it is internal that flue gas enters desulfurizing tower 5 after electrostatic fabric filter, desulfurizing tower 5
Sulfur dioxide within flue gas is purged.
The device of sulfur trioxide in flue gas of removing herein still further comprises wastewater treatment equipment and nebulizer 9, useless
Water treatment facilities is used for removing the heavy metallic salt in the desulfurization wastewater that desulfurizing tower 5 flows out and float, and by the ph of desulfurization wastewater
Value regulation is to alkalescence.Wherein wastewater treatment equipment may further include the most again reaction tank 3, depositing reservoir 2, and reaction tank 3 is arranged
In the downstream of described desulfurizing tower 5, it is loaded with the alkaline solution reacting and generating precipitation with heavy metallic salt in desulfurization wastewater, through described
The ph value scope of the desulfurization wastewater of reaction tank 3 is: 8-9.Alkaline solution can be that calcium hydroxide is molten with the mixing of solvable inorganic salt
Liquid, this can stir formation by adding solid calcium hydroxide in reaction tank simultaneously.
The alkaline desulfurization wastewater in clarified pond 2 can be directly over the nozzle of nebulizer 9 and spray into flue 10 inside.
Nebulizer 9 has the nozzle for being atomized by the desulfurization wastewater after wastewater treatment equipment, and the nozzle of nebulizer 9 sets
The flue 10 of the gas approach being placed in connection electrostatic fabric filter is internal.About atomizing particle evaporation time in flue 10, this
Literary composition has done lot of experiments research, studies what the principal element not prior art finding to affect atomizing particle evaporation time was thought
The temperature of flue gas, but the size of atomizing particle diameter.Therefore herein according to the physical length of actual application environment flue 10, set
The size of nebulizer 9 nozzle, so that atomizing particle evaporated before entering the bag district of electrostatic fabric filter completely.Optimal perfect condition
Just evaporate before entering electrostatic fabric filter for atomizing particle, reduce the atomizing particle impact on electric field region dedusting as far as possible.
Generally the flow velocity of flue 10 inside smoke is 15m/s, is connected to flue 10 length before electrostatic fabric filter import
Usually 10-15m, if it is desired to atomizing particle just evaporated before entering electrostatic fabric filter, then atomizing particle is accomplished by
Evaporation is completed at about 1s.Test confirms, when the diameter of the atomizing particle of atomizer ejection is less than or equal to 50 μm, can realize
Atomizing particle just evaporated before entering electrostatic fabric filter.
Certainly, according to the difference of flue 10 length, can suitably regulate the size of atomizer, to reach above-mentioned technology effect
Really.
Refer to Fig. 2, Fig. 2 is to remove the control method flow chart of sulfur trioxide in flue gas in detailed description of the invention.
In above-mentioned removal flue gas on the basis of the device of sulfur trioxide, a kind of control method, this control are also provided herein
Method processed particularly as follows:
S1, the heavy metallic salt removed in the desulfurization wastewater flowed out by desulfurizing tower 5 and float, and by the ph value of desulfurization wastewater
Regulation is to alkalescence；
S2, by the desulfurization wastewater atomized spray after wastewater treatment equipment in the flue 10 of electrostatic fabric filter gas approach
Portion, wherein, the granule after nebulizer 9 nozzle atomization evaporated before entering the bag district of electrostatic fabric filter completely.
Further, step S1 particularly as follows:
S11, use calcium hydroxide to remove the heavy metallic salt in desulfurization wastewater, and regulate desulfurization wastewater ph value to 8-9；
The regulation further of the ph value of desulfurization wastewater is risen by S12, addition calcium oxide to 11-12, wastewater temperature.
Herein the ph value of desulfurization wastewater is regulated to alkalescence, desulfurization wastewater is sprayed onto flue 10 internal the most again, alkalescence
Desulfurization wastewater be evaporated the villaumite of precipitation and hydroxide in flue 10 with SO in flue gas3Carry out Deng acidic materials and mercury element
Being fully contacted, Elemental Mercury can be converted into oxidation state hydrargyrum by villaumite, improves the removal efficiency of hydrargyrum, and hydroxide can be with SO3Deng
Acidic materials reacting generating salt, improves SO3Removal efficiency.And partly atomized granule touches with the fly ash granule in flue gas
Hit, separate out crystal salt after evaporation rapidly and hydroxide is attached on fly ash granule, make the ratio resistance of flying dust reduce, electricity can be improved
The efficiency of dust collection of bag dust collector.
The villaumite being attached on flying dust and hydroxide can increase hydrargyrum and SO on the basis of script physical absorption3More
The chemisorbed of stability and high efficiency, improves flying dust to hydrargyrum and SO3Binding ability, and then flying dust trapped by dedusting filtering bag, hydrargyrum with
SO3Also it is removed.
Partial drop, after ejection, can occur multiple impacts, collision rift, exhausted water from different fine particles such as PM2.5
Drip can combine with these trickle fly ash granules, after drop is evaporated rapidly, these trickle flying dusts will coalescence together,
Become bigger fly ash granule, thus be easier to be trapped by electrostatic fabric filter.Subsequently, hydrargyrum and SO have been adsorbed3Flying dust and waste water
Drop be evaporated after separate out crystallization major part electricity district be removed, another part electricity district charged after enter bag district, by filter bag with
Dust layer the most charged outside filter bag intercepts outside, is combined with original dust layer and forms new fluffy dust layer, new dust
Owing to having villaumite, hydroxide and bigger specific surface area on layer, stronger physical absorption and the ability of chemisorbed are permissible
Make it as last layer " filter membrane ", reduce hydrargyrum, SO3, the discharge of the various pollutant such as PM2.5.The cleaning cycle in bag district
Longer, it means that villaumite can be used more effectively with hydroxide.
Meanwhile, these dust all carrying hydroxide, these hydroxide can be with SO3It is neutralized anti-
Should, thus prevent filter bag by SO3Corrosion, extends the life-span of filter bag.Hydroxide in flue gas and SO3The sulphuric acid generated after reaction
Salt is for hydrargyrum and SO3Also there is stronger adsorption.Waste water be evaporated after product major part the most with flying dust by electricity district and bag
District traps, and therefore, the operation of desulfurizing tower 5 will not be produced impact, cause the enrichment phenomenon of chlorine in desulfurization wastewater spray air-returen flue 10.
Further, desulfurization wastewater atomizing particle in flue 10 evaporated before entering bag district completely, will not produce paste bag phenomenon.
The method can make desulfurization wastewater and electrostatic fabric filter perfect adaptation, electrostatic fabric filter ensure villaumite not further into
On the premise of desulfurizing tower 5, bigger after desulfurization wastewater is sprayed into flue 10 improve flying dust and multi-pollutant in electrostatic fabric filter
Binding ability, utilize again the feature of electrostatic fabric filter Zhong Dai district's dedusting simultaneously, be greatly improved removing hydrargyrum, SO3, the dirt such as PM2.5
The efficiency of dye thing and stability, make electrostatic fabric filter reduce the straying quatity of activated carbon not even during removing multi-pollutant
Spraying into activated carbon, efficient, the stable that can complete multi-pollutant remove.Solve existing electrostatic fabric filter demercuration efficiency unstable
Fixed and that demercuration is relatively costly problem, also can effectively protect filter bag, improve life-span of the filter bag.
In above-described embodiment, if the alkaline solution of storage is aqua calcis in reaction tank 3, the most above-mentioned atomizing particle
The hydroxide of middle precipitation is calcium hydroxide.
In order to avoid the atomizing particle ejection impact on flue-gas temperature as far as possible, can desulfurization wastewater enter nebulizer 9 it
Before, desulfurization wastewater is carried out problem regulation.Specific as follows.
Above-mentioned wastewater treatment equipment can further include PH regulating reservoir 1, and PH regulating reservoir 1 is arranged at depositing reservoir 2 times
Trip, the upstream of described nebulizer 9, be loaded with pH value Auto-regulator in PH regulating reservoir 1, for regulation by taking off that depositing reservoir 2 flows out
Sulfur wastewater temperature is to predesigned pH value.
PH regulating reservoir 1 can by add PH regulation material with regulate desulfurization wastewater pH value, and this material dissolve
Temperature in rear PH regulating reservoir 1 raises.This material can be calcium oxide, while adding calcium oxide, and the ph value of desulfurization wastewater
Rising, after described calcium oxide regulates, the ph value of desulfurization wastewater is in the range of 11-12 the most simultaneously.
That is, the desulfurization wastewater after PH regulating reservoir 1 is high alkalinity solution, and in ie in solution, the concentration of hydroxide is higher,
So when high alkalinity solution sprays into flue 10, the beneficially quick precipitation of hydroxide.And Calcium oxide dissolution dispels the heat, desulfurization
The temperature of waste water will have a certain degree of rising, and temperature raises and is beneficial to high aqueous slkali further when spraying into flue 10, hydroxide
Precipitation.
In order to reduce the atomizing particle corrosion to flue 10 inwall as far as possible, the atomizing angle of nebulizer 9 nozzle should be the least, mist
Change angle and can select 0 °-60 °.Evaporating to make atomizing particle try one's best in flue 10, nozzle is installed on from electricity bag the most as far as possible
Flue 10 end that cleaner unit import is remote.
In a kind of detailed description of the invention, nozzle is set up in parallel formation evaporating area, the vertical flow of flue gas side of evaporating area plane
To, the injection direction of nozzle is along flow of flue gas direction.
Desulfurizing tower 5 can be arranged at the downstream of electrostatic fabric filter, the i.e. flue gas through electrostatic fabric filter and enter through back-end ductwork 6
Desulfurizing tower 5, is drained into outside by chimney 4 after desulfurizing tower 5 again.
Above to provided by the present invention based on electrostatic fabric filter remove mercury in flue gas and the control method of sulfur trioxide and
Device is described in detail.Object lesson only for the present invention is set forth herein, above detailed description of the invention
Method and the core concept thereof being only intended to help to understand the present invention is described.It should be pointed out that, the common skill for the art
For art personnel, on the premise of without departing from feature of the present invention, it is also possible to make some improvements and modifications, these improvements and modifications
Also protection scope of the present invention should be considered as.
Claims (9)
1. remove mercury in flue gas and the control method of sulfur trioxide based on electrostatic fabric filter for one kind, it is characterised in that this controlling party
Method particularly as follows:
S1, the heavy metallic salt removed in the desulfurization wastewater flowed out by desulfurizing tower (5) and float, and the ph value of desulfurization wastewater is adjusted
Joint is to alkalescence；
S2, by the desulfurization wastewater atomized spray after wastewater treatment equipment processes in the flue (10) of electrostatic fabric filter gas approach
Inside, wherein, the granule after nebulizer (9) nozzle atomization evaporated before entering the bag district of electrostatic fabric filter completely.
2. control method as claimed in claim 1, it is characterised in that step S1 particularly as follows:
S11, use calcium hydroxide to remove the heavy metallic salt in desulfurization wastewater, and regulate desulfurization wastewater ph value to 8-9；
S12, addition calcium oxide are by the ph value of desulfurization wastewater regulation further to 11-12.
3. the control method as described in any one of claim 1 to 2, it is characterised in that through described nebulizer in described step S2
(9) the atomizing particle grain size of nozzle ejection is less than or equal to 50 μm.
4. remove mercury in flue gas and the device of sulfur trioxide based on electrostatic fabric filter for one kind, it is characterised in that include electric bag dust
Device, also includes with lower component:
Wastewater treatment equipment, for removing the heavy metallic salt in the desulfurization wastewater flowed out by desulfurizing tower (5) and float, and will be de-
The ph value regulation of sulfur waste water is to alkalescence；
Nebulizer (9), has the nozzle for being atomized by the desulfurization wastewater after wastewater treatment equipment, described nebulizer (9)
The flue (10) that nozzle is arranged at the gas approach connecting described electrostatic fabric filter is internal, and the granule after atomization is entering electricity bag
Evaporate completely before the bag district of cleaner unit.
5. the device of sulfur trioxide in removal flue gas as claimed in claim 4, it is characterised in that described wastewater treatment equipment bag
Include with lower component:
Reaction tank (3), is arranged at the downstream of described desulfurizing tower (5), is loaded with and reacts with heavy metallic salt in desulfurization wastewater and generate
The alkaline solution of precipitation, through the ph value scope of the desulfurization wastewater of described reaction tank (3) be: 8-9；
Depositing reservoir (2), is used for filtering desulfurization wastewater through float produced by described reaction tank (3), the desulfurization clarified with acquisition
Waste water；
PH regulating reservoir (1), is arranged at the downstream of described depositing reservoir (2), the upstream of described nebulizer (9), described PH regulating reservoir (1)
Inside be loaded with pH value Auto-regulator, described depositing reservoir (2) desulfurization wastewater flowed out flows through described PH regulating reservoir (1) and carries out pH value
Regulation.
6. the device of sulfur trioxide in removal flue gas as claimed in claim 5, it is characterised in that the material of described PH regulation is
Calcium oxide, and after described calcium oxide regulates the ph value of desulfurization wastewater in the range of 11-12.
7. the device of sulfur trioxide in removal flue gas as claimed in claim 5, it is characterised in that contain in described reaction tank (3)
The mixed solution that alkaline solution is calcium hydroxide and solvable inorganic salt of dress.
8. the device of sulfur trioxide in removal flue gas as claimed in claim 4, it is characterised in that the mist of described nebulizer (9)
Changing angle range 0 ° to 60 °, described nozzle is set up in parallel formation evaporating area, plane vertical flow of flue gas direction, described evaporating area, institute
State the injection direction of nozzle along flow of flue gas direction.
9. the device of sulfur trioxide in the removal flue gas as described in any one of claim 4 to 8, it is characterised in that through described mist
The atomizing particle grain size changing the ejection of device (9) nozzle is less than or equal to 50 μm, and described nozzle is positioned at flue (10) far
End from described electrostatic fabric filter.
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| CN201610624013.5A CN106076095A (en) | 2016-08-02 | 2016-08-02 | Mercury in flue gas and the control method of sulfur trioxide and device is removed based on electrostatic fabric filter |
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| CN201610624013.5A CN106076095A (en) | 2016-08-02 | 2016-08-02 | Mercury in flue gas and the control method of sulfur trioxide and device is removed based on electrostatic fabric filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106621766A (en) * | 2016-12-05 | 2017-05-10 | 中国华电集团科学技术研究总院有限公司 | Method and system for removing SO3 from boiler flue gas by using desulfurization waste water |
| CN106731599A (en) * | 2016-12-14 | 2017-05-31 | 国源设计院有限公司 | A kind of flue spray dust remover |
| CN107344061A (en) * | 2017-07-07 | 2017-11-14 | 北京清新环境技术股份有限公司 | A kind of sulfur trioxide and mercury removal system and its removal methods based on magnesium processes desulfurization |
| CN109821349A (en) * | 2019-02-18 | 2019-05-31 | 浙江菲达环保科技股份有限公司 | A kind of Hg, SO3The electric-bag complex dust collector of cooperation-removal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103933838A (en) * | 2013-01-21 | 2014-07-23 | 山东大学 | Pollutant combined removal device and method through recycling of chlorine in coal |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103933838A (en) * | 2013-01-21 | 2014-07-23 | 山东大学 | Pollutant combined removal device and method through recycling of chlorine in coal |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106621766A (en) * | 2016-12-05 | 2017-05-10 | 中国华电集团科学技术研究总院有限公司 | Method and system for removing SO3 from boiler flue gas by using desulfurization waste water |
| CN106731599A (en) * | 2016-12-14 | 2017-05-31 | 国源设计院有限公司 | A kind of flue spray dust remover |
| CN107344061A (en) * | 2017-07-07 | 2017-11-14 | 北京清新环境技术股份有限公司 | A kind of sulfur trioxide and mercury removal system and its removal methods based on magnesium processes desulfurization |
| CN109821349A (en) * | 2019-02-18 | 2019-05-31 | 浙江菲达环保科技股份有限公司 | A kind of Hg, SO3The electric-bag complex dust collector of cooperation-removal |
| CN109821349B (en) * | 2019-02-18 | 2024-08-06 | 浙江菲达环保科技股份有限公司 | Hg, SO3Electric bag composite dust collector with cooperative removal function |
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