CN106334441A - Cascade and deep coal-fired flue gas SO<3> removal system and method - Google Patents
Cascade and deep coal-fired flue gas SO<3> removal system and method Download PDFInfo
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- CN106334441A CN106334441A CN201610889777.7A CN201610889777A CN106334441A CN 106334441 A CN106334441 A CN 106334441A CN 201610889777 A CN201610889777 A CN 201610889777A CN 106334441 A CN106334441 A CN 106334441A
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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
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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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
- B01D53/79—Injecting reactants
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
- B03C3/014—Addition of water; Heat exchange, e.g. by condensation
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Abstract
The invention relates to a cascade and deep coal-fired flue gas SO<3> removal system and method. The system includes an SCR denitration device, an alkaline absorber spraying device, an air preheater, a temperature regulating and effect improving device, an electrostatic precipitator, a desulfurization tower and a wet electrostatic precipitator, wherein the temperature regulating and effect improving device comprises a cooling section and a heating section, the SCR denitration device, the air preheater, the cooling section of the temperature regulating and effect improving device, the electrostatic precipitator, the desulfurization tower and the wet electrostatic precipitator are sequentially arranged in the flue gas removal direction. The alkaline absorber spraying device is arranged in front of the SCR denitration device, behind the SCR denitration device, in front of the air preheater, behind the air preheater or in front of the cooling section of the temperature regulating and effect improving device. The cascade and deep coal-fired flue gas SO<3> removal system conducts cascade and deep removal on flue gas SO<3> through various pollutant control devices and achieves that the SO<3>emission concentration is less than 5 mg/Nm<3>.
Description
Technical field
The invention belongs to coal-fired flue-gas pollutant removing technical field, concretely relate to a kind of coal-fired flue-gas so3Ladder
Level deep removal system and method.
Background technology
Coal-fired thermal power generation is the principal mode of the current electrical energy production of China, and China's thermoelectricity generated energy is up to gross generation
More than 80%, the electric installed capacity wherein based on fire coal accounts for total capacity 75%.China's total energy consumption 36.1 hundred million in 2014
Ton standard coal, consumption of coal accounts for the 66% of total energy consumption.Energy supply general layout based on coal for the China will be in future one
Will not change in the section time.
In coal-burning power plant, so3Source mainly have two aspects: one is in combustion, and contain in coal is flammable
Property element sulphur burning generate so2Afterwards, part so2It is further oxided generation so3；Two is at selective-catalytic-reduction denitrified (scr)
During, part so2In the presence of scr catalyst, so is generated by catalysis oxidation3.
So after scr gas denitrifying technology large-scale application, in flue gas3Greatly increase, the harm causing is also increasingly
Big: to produce " Lan Yu " phenomenon, as so in flue gas3When concentration reaches 10～20ppm, arise that " Lan Yu " phenomenon；Cause sky
The dust stratification of pre- device, in air preheater, when flue-gas temperature is reduced to below acid dew point, condensation of sulfuric acid, is attached on flying dust, forms tool
The precipitate having certain viscosity is deposited on air preheater surface, causes air preheater dust stratification and fouling；Generate ammonium hydrogen sulfate, scr reacts
In device, at 300 DEG C about, so3Can be with nh3Reaction generates ammonium hydrogen sulfate, is deposited on catalyst surface, blocking catalyst hole, fall
The activity of low catalyst and life-span, so in air preheater, in the ammonia and flue gas escaped in scr reactor3React generation
Ammonium hydrogen sulfate, the viscosity of ammonium hydrogen sulfate causes the surface that flying dust is deposited on air preheater to cause the blocking of air preheater.Particularly in combustion
In the case of burning high-sulfur coal, so3Harm to power plant is more serious.
Control in equipment in existing pollution that caused by coal burning thing, also there is no specific environmental protection equipment to so in flue gas3Taken off
Remove, with environmental requirement increasingly stringent, need a kind of coal-fired flue-gas so of exploitation badly3Removing system and control method, give full play to each
Pollutant catabolic gene is equipped to so3Removing potentiality, lower flue gas in so3Harm to power plant.
Content of the invention
In order to overcome so in existing coal-fired flue-gas3The deficiency that control technology exists, particularly in the situation of burning high sulfur coal
Under, reduce so3Harm to electric power factory equipment and environment, the invention provides a kind of coal-fired flue-gas so3Step deep removal system and
Method, gives full play to each pollutant catabolic gene and equips to so3Removing potentiality, realize so3Concentration of emission control in 5mg/nm3With
Under.
A kind of coal-fired flue-gas so3Step deep removal system, described system includes scr denitrification apparatus, alkaline absorbent spray
Injection device, air preheater, homoiothermic enhancing device, electrostatic precipitator, desulfurizing tower and wet cottrell, described homoiothermic enhancing device
Including temperature descending section and warming-up section, described scr denitrification apparatus, air preheater, homoiothermic enhancing device temperature descending section, electrostatic precipitator, desulfurization
Tower, wet cottrell, homoiothermic enhancing device warming-up section are sequentially arranged along flue gas removing direction；Described alkaline absorbent injection
Device setting position be scr denitrification apparatus before, after scr denitrification apparatus, before air preheater, or after air preheater, homoiothermic
Before enhancing device temperature descending section.
Preferably, being provided with three layers of catalyst in described scr denitrification apparatus.Three layers low are arranged in scr denitrification apparatus
so2/so3The catalyst of conversion ratio, so2/so3Conversion ratio is less than 0.8%, reduces when flue gas passes through scr device, so in flue gas2
To so3Conversion, suppress so3Generation.
Preferably, being provided with booster fan between described electrostatic precipitator and desulfurizing tower.
A kind of coal-fired flue-gas so3Step deep removal method, coal-fired flue-gas out sequentially pass through scr denitration dress afterwards from boiler
Put, air preheater, the temperature descending section of homoiothermic enhancing device, electrostatic precipitator, booster fan, desulfurizing tower, wet cottrell, homoiothermic
The warming-up section of enhancing device, is finally emptied by chimney.
Homoiothermic enhancing device is divided into two sections: temperature descending section and warming-up section；Wherein, the temperature descending section of homoiothermic enhancing device is arranged on sky
After pre- device, flue gas make after homoiothermic enhancing device the flue-gas temperature of entrance electrostatic precipitator control acid dew point in flue gas with
Under, so in flue gas3It is condensed into sulfuric acid mist and adsorbs on dust surface, remove after being caught by electrostatic precipitator, exhausted in flue gas
Most of so3Removed by electrostatic precipitator.After desulfurizing tower is arranged on electrostatic precipitator, on the one hand, by the washing of desulfurization slurry
Flue-gas temperature declines further, so in flue gas3Condensation becomes big further；On the other hand, the spraying layer to desulfurizing tower and demisting
Device is optimized design, improves absorption tower serosity to so in flue gas3Removal efficiency.Wet cottrell is arranged on desulfurizing tower
Afterwards, flue gas is after desulfurizing tower, so3Mainly with h2so4Presented in microlayer model, the diameter of its average grain 0.4 μm with
Under, belong to submicron category, wet cottrell has very high capture rate to submicron particles, can effectively improve in flue gas
so3Removal efficiency.
Preferably, being additionally provided with alkaline absorbent injection apparatus before scr denitrification apparatus, coal-fired flue-gas take off in entrance scr
First pass through alkaline absorbent injection apparatus before nitre device to be processed.Alkalescence absorbs injection apparatus and is arranged on scr denitrification apparatus
Before, it is possible to decrease ammonium hydrogen sulfate is in the generation of scr catalyst upper surface.
Preferably, the position after scr denitrification apparatus, before air preheater is additionally provided with alkaline absorbent injection apparatus, combustion
Flue-gas, after processing through scr denitrification apparatus, enter air preheater through alkaline absorbent injection apparatus after processing.Alkalescence absorbs
After injection apparatus are arranged on scr denitrification apparatus, before air preheater, it is possible to decrease so in the ammonia and flue gas escaped in scr reactor3Send out
Raw reaction generates ammonium hydrogen sulfate, it is to avoid the viscosity of ammonium hydrogen sulfate causes the surface that flying dust is deposited on air preheater to cause the stifled of air preheater
Plug.
Preferably, the position after air preheater, before homoiothermic enhancing device temperature descending section is additionally provided with alkaline absorbent injection
Device, coal-fired flue-gas, after processing through air preheater, enter homoiothermic enhancing device through alkaline absorbent injection apparatus after processing
Temperature descending section.After alkalescence absorption injection apparatus are arranged on air preheater, it is to reduce so in flue gas3The optimum position of total amount.
Alkaline absorbent injection apparatus spray alkaline absorbent, so in alkaline absorbent and flue gas into flue3Reaction,
Make so3Removal efficiency more than 90%.
Preferably, the alkaline absorbent adopting in alkaline absorbent injection apparatus is magnesium hydroxide, calcium hydroxide, sulphuric acid
Any one in hydrogen sodium, sodium carbonate, calcium bicarbonate.
Preferably, described coal-fired flue-gas so3Step deep removal method, comprises the steps:
(1) coal-fired flue-gas from boiler out after, first pass around scr denitrification apparatus, so2/so3Conversion ratio is less than 0.8%；
(2) coal-fired flue-gas enter alkaline absorbent injection apparatus after scr denitrification apparatus, spray alkalescence inhale into flue
Receive agent, so in alkaline absorbent and flue gas3Reaction, so3Removal efficiency more than 90%；
(3) coal-fired flue-gas enter the temperature descending section of homoiothermic enhancing device, the temperature descending section of homoiothermic enhancing device after air preheater
The flue-gas temperature of entrance electrostatic precipitator is made to control so below the acid dew point of flue gas so that in flue gas3It is condensed into sulfuric acid mist
And adsorb on dust surface, remove after being caught by electrostatic precipitator；
(4) coal-fired flue-gas enter desulfurizing tower, the cooling effect of sprayed slurry after electrostatic precipitator, make in flue gas
so3Caragana seed pests, the spraying layer to desulfurizing tower and demister are optimized design, improve absorption tower serosity to so in flue gas3De-
Remove, reduce so in flue gas further3；
(5) coal-fired flue-gas, after desulfurizing tower, by the capture of wet cottrell, realize so3Concentration be less than
5mg/nm3；
(6) flue gas, after wet cottrell, enters the warming-up section of homoiothermic enhancing device, flue-gas temperature is increased to 85
DEG C, after through chimney emptying；
(7) so in flue gas3After each pollutant catabolic gene equipment step deep removal, make so3Concentration of emission control
5mg/nm3Below.
The beneficial effects of the present invention is:
(1) denitration reaction device adopts low so2/so3The catalyst of conversion, reduces so in denitrating system3Generation；
(2) alkaline absorbent injection apparatus, so in efficient removal flue gas are set in system3, the life of suppression ammonium hydrogen sulfate
Become；
(3) adopt homoiothermic enhancing device, make the flue-gas temperature of entrance electrostatic precipitator be less than so3Acid dew point so that cigarette
So in gas3It is condensed into sulfuric acid mist and adsorb on dust surface, by electrostatic precipitator efficient removal；
(4) pass through the condensation to flue gas of desulfurizing tower, promote so in flue gas3Cold Caragana seed pests, by spray
The optimization design of layer, improves absorption tower serosity to so3Removing；
(5) wet cottrell is set after desulfurizing tower, further so in flue gas after removing desulfurizing tower3；
(6) removed by the gradient that each pollutant catabolic gene is equipped, make so3Concentration of emission control in 5mg/nm3Below.
Brief description
Fig. 1 is the structural representation of the embodiment of the present invention 1；
Fig. 2 is the structural representation of the embodiment of the present invention 2；
Fig. 3 is the structural representation of the embodiment of the present invention 3.
Specific embodiment
Below in conjunction with the accompanying drawings and be embodied as that the present invention will be further described, but protection scope of the present invention is not limited to
This.
Embodiment 1
With reference to Fig. 1, a kind of coal-fired flue-gas so3Step deep removal system, described system includes scr denitrification apparatus 2, alkalescence
Sorbent injection device 3, air preheater 4, homoiothermic enhancing device, electrostatic precipitator 6, desulfurizing tower 8 and wet cottrell 9, institute
State homoiothermic enhancing device and include temperature descending section 5 and warming-up section 10, described scr denitrification apparatus 2, alkaline absorbent injection apparatus 3, sky are pre-
Device 4, homoiothermic enhancing device temperature descending section 5, electrostatic precipitator 6, desulfurizing tower 8, wet cottrell 9, homoiothermic enhancing device heat up
Section 10 is sequentially arranged along flue gas removing direction；It is provided with booster fan 7 between described electrostatic precipitator 6 and desulfurizing tower 8.
Coal-fired flue-gas out sequentially pass through scr denitrification apparatus 2, alkaline absorbent injection apparatus 3, air preheater afterwards from boiler 1
4th, the temperature descending section 5 of homoiothermic enhancing device, electrostatic precipitator 6, booster fan 7, desulfurizing tower 8, wet cottrell 9, homoiothermic increase
The warming-up section 10 of effect device, is finally emptied by chimney 11.
Three layers of low so are set in described scr denitrification apparatus 22/so3The catalyst of conversion ratio, so2/so3Conversion ratio is less than
0.8%, reduce flue gas so during by catalysis2To so3Conversion, suppress so3Generation；
After described alkaline absorbent injection apparatus 3 setting scr denitrification apparatus 2, before air preheater 4, spray alkali into flue
Property absorbent, so in alkaline absorbent and flue gas3Reaction, so3Removal efficiency more than 90%；
Described alkaline absorbent is magnesium hydroxide, calcium hydroxide, sodium bisulfate, sodium carbonate, arbitrary in calcium bicarbonate
Kind；
After the temperature descending section 5 of described homoiothermic enhancing device is arranged on air preheater 4, by the temperature descending section 5 of homoiothermic enhancing device
Control so below the acid dew point of flue gas so that in flue gas for the flue-gas temperature entering electrostatic precipitator 63It is condensed into sulfuric acid mist simultaneously
Absorption, on dust surface, removes after being trapped by electrostatic precipitator 6, the most sulfur trioxide in flue gas are by electrostatic precipitator 6
Removing；
After described booster fan 7 is arranged on electrostatic precipitator 6, before desulfurizing tower 8, overcome whole pollutant control system
Resistance；
After described desulfurizing tower 8 is arranged on booster fan 7, the spray of desulfurizing tower 8 is acted on, reduces flue-gas temperature, promote
So in flue gas3Caragana seed pests；By the optimization design of spraying layer and demister, improve absorption tower serosity to so in flue gas3De-
Remove；
After described wet cottrell 9 is arranged on desulfurizing tower 8, flue gas after desulfurizing tower 8, so3Mainly with h2so4
Presented in microlayer model, the diameter of its average grain, below 0.4 μm, belongs to submicron category, and wet cottrell 9 is right
Submicron particles have very high capture rate, can effectively improve so in flue gas3Removal efficiency；
Described flue gas, after wet cottrell 9, enters the warming-up section 10 of homoiothermic enhancing device, by flue-gas temperature liter
High to 85 DEG C about, after empty through chimney 11.
Embodiment 2
With reference to Fig. 2, a kind of coal-fired flue-gas so3Step deep removal system, described system includes scr denitrification apparatus 2, alkalescence
Sorbent injection device 3, air preheater 4, homoiothermic enhancing device, electrostatic precipitator 6, desulfurizing tower 8 and wet cottrell 9, institute
State homoiothermic enhancing device and include temperature descending section 5 and warming-up section 10, described scr denitrification apparatus 2, air preheater 4, the cooling of homoiothermic enhancing device
Section 5, electrostatic precipitator 6, desulfurizing tower 8, wet cottrell 9, homoiothermic enhancing device warming-up section 10 are suitable along flue gas removing direction
Secondary setting；Before the position of alkaline absorbent injection apparatus 3 setting is scr denitrification apparatus 2, described electrostatic precipitator 6 and desulfurization
It is provided with booster fan 7 between tower 8.
Coal-fired flue-gas out sequentially pass through alkaline absorbent injection apparatus 3, scr denitrification apparatus 2, air preheater afterwards from boiler 1
4th, the temperature descending section 5 of homoiothermic enhancing device, electrostatic precipitator 6, booster fan 7, desulfurizing tower 8, wet cottrell 9, homoiothermic increase
The warming-up section 10 of effect device, is finally emptied by chimney 11.
Embodiment 3
With reference to Fig. 3, a kind of coal-fired flue-gas so3Step deep removal system, described system includes scr denitrification apparatus 2, alkalescence
Sorbent injection device 3, air preheater 4, homoiothermic enhancing device, electrostatic precipitator 6, desulfurizing tower 8 and wet cottrell 9, institute
State homoiothermic enhancing device and include temperature descending section 5 and warming-up section 10, described scr denitrification apparatus 2, air preheater 4, the cooling of homoiothermic enhancing device
Section 5, electrostatic precipitator 6, desulfurizing tower 8, wet cottrell 9, homoiothermic enhancing device warming-up section 10 are suitable along flue gas removing direction
Secondary setting；Alkaline absorbent injection apparatus 3 setting position be air preheater 4 after, before homoiothermic enhancing device temperature descending section 5, institute
State and between electrostatic precipitator 6 and desulfurizing tower 8, be provided with booster fan 7.
Coal-fired flue-gas out sequentially pass through scr denitrification apparatus 2, air preheater 4, alkaline absorbent injection apparatus afterwards from boiler 1
3rd, the temperature descending section 5 of homoiothermic enhancing device, electrostatic precipitator 6, booster fan 7, desulfurizing tower 8, wet cottrell 9, homoiothermic increase
The warming-up section 10 of effect device, is finally emptied by chimney 11.
Embodiment 4
A kind of coal-fired flue-gas so3Step deep removal method, is arranged on after scr denitrification apparatus with alkaline injection apparatus and is
Example, comprises the steps:
(1) coal-fired flue-gas from boiler out after, first pass around scr denitrification apparatus, three layers of low so be set2/so3Conversion ratio
Catalyst, so2/so3Conversion ratio is less than 0.8%, reduces when flue gas passes through scr device, so in flue gas2To so3Conversion, suppression
So processed3Generation；
(2) coal-fired flue-gas enter alkaline absorbent injection apparatus after scr denitrification apparatus, spray alkalescence inhale into flue
Receive agent, so in alkaline absorbent and flue gas3Reaction, so3Removal efficiency more than 90%；
(3) coal-fired flue-gas enter the temperature descending section of homoiothermic enhancing device, the temperature descending section of homoiothermic enhancing device after air preheater
The flue-gas temperature of entrance electrostatic precipitator is made to control so below the acid dew point of flue gas so that in flue gas3It is condensed into sulfuric acid mist
And adsorb on dust surface, remove after being caught by electrostatic precipitator；
(4) coal-fired flue-gas enter desulfurizing tower, the cooling effect of sprayed slurry after electrostatic precipitator, make in flue gas
so3Caragana seed pests, the spraying layer to desulfurizing tower and demister are optimized design, improve absorption tower serosity to so in flue gas3De-
Remove, reduce so in flue gas further3；
(5) so after desulfurizing tower, in flue gas for the coal-fired flue-gas3Mainly with h2so4Presented in microlayer model, it is average
The diameter of granule, below 0.4 μm, belongs to submicron category, and wet cottrell has very high capture to submicron particles
Rate, can effectively improve so in flue gas3Removal efficiency, realize so3Concentration be less than 5mg/nm3；
(6) flue gas, after wet cottrell, enters the warming-up section of homoiothermic enhancing device, flue-gas temperature is increased to 85
DEG C about, after through chimney emptying；
(7) so in flue gas3After each pollutant catabolic gene equipment step deep removal, make so3Concentration of emission control
5mg/nm3Below.
Embodiment 5
A kind of coal-fired flue-gas so3Step deep removal method, so that alkaline injection apparatus are arranged on after air preheater as a example, bag
Include following step:
(1) coal-fired flue-gas from boiler out after, first pass around scr denitrification apparatus, three layers of low so be set2/so3Conversion ratio
Catalyst, so2/so3Conversion ratio is less than 0.8%, reduces when flue gas passes through scr device, so in flue gas2To so3Conversion, suppression
So processed3Generation；
(2) coal-fired flue-gas enter alkaline absorbent injection apparatus after scr denitrification apparatus after air preheater, to flue
So in interior injection alkaline absorbent, alkaline absorbent and flue gas3Reaction, so3Removal efficiency more than 95%；Alkalescence absorbs
After injection apparatus are arranged on air preheater, it is to reduce so in flue gas3The optimum position of total amount；
(3) coal-fired flue-gas enter the temperature descending section of homoiothermic enhancing device, and the temperature descending section of homoiothermic enhancing device makes entrance electrostatic remove
The flue-gas temperature of dirt device controls so below the acid dew point of flue gas so that in flue gas3It is condensed into sulfuric acid mist and adsorb in dust
Surface, removes after being caught by electrostatic precipitator；
(4) coal-fired flue-gas enter desulfurizing tower, the cooling effect of sprayed slurry after electrostatic precipitator, make in flue gas
so3Caragana seed pests, the spraying layer to desulfurizing tower and demister are optimized design, improve absorption tower serosity to so in flue gas3De-
Remove, reduce so in flue gas further3；
(5) so after desulfurizing tower, in flue gas for the coal-fired flue-gas3Mainly with h2so4Presented in microlayer model, it is average
The diameter of granule, below 0.4 μm, belongs to submicron category, and wet cottrell has very high capture to submicron particles
Rate, can effectively improve so in flue gas3Removal efficiency, realize so3Concentration be less than 3mg/nm3；
(6) flue gas, after wet cottrell, enters the warming-up section of homoiothermic enhancing device, flue-gas temperature is increased to 85
DEG C about, after through chimney emptying；
(7) so in flue gas3After each pollutant catabolic gene equipment step deep removal, make so3Concentration of emission control
3mg/nm3Below.
Claims (9)
1. a kind of coal-fired flue-gas so3Step deep removal system it is characterised in that: described system includes scr denitrification apparatus, alkalescence
Sorbent injection device, air preheater, homoiothermic enhancing device, electrostatic precipitator, desulfurizing tower and wet cottrell, described homoiothermic
Enhancing device includes temperature descending section and warming-up section, described scr denitrification apparatus, air preheater, homoiothermic enhancing device temperature descending section, electrostatic precipitation
Device, desulfurizing tower, wet cottrell, homoiothermic enhancing device warming-up section are sequentially arranged along flue gas removing direction；Described alkalescence is inhaled
Receive agent injection apparatus setting position be scr denitrification apparatus before, after scr denitrification apparatus, before air preheater, or air preheater it
Afterwards, before homoiothermic enhancing device temperature descending section.
2. coal-fired flue-gas so according to claim 13Step deep removal system it is characterised in that: described scr denitration dress
Three layers of catalyst are centered.
3. coal-fired flue-gas so according to claim 13Step deep removal system it is characterised in that: described electrostatic precipitator
It is provided with booster fan and desulfurizing tower between.
4. a kind of coal-fired flue-gas so3Step deep removal method it is characterised in that: coal-fired flue-gas out sequentially pass through afterwards from boiler
Scr denitrification apparatus, air preheater, the temperature descending section of homoiothermic enhancing device, electrostatic precipitator, booster fan, desulfurizing tower, wet electrostatic remove
Dirt device, the warming-up section of homoiothermic enhancing device, are finally emptied by chimney.
5. coal-fired flue-gas so according to claim 43Step deep removal method it is characterised in that: scr denitrification apparatus it
Before be additionally provided with alkaline absorbent injection apparatus, coal-fired flue-gas enter scr denitrification apparatus before first pass through alkaline absorbent injection
Device is processed.
6. coal-fired flue-gas so according to claim 43Step deep removal method it is characterised in that: scr denitrification apparatus it
Afterwards, the position before air preheater is additionally provided with alkaline absorbent injection apparatus, and coal-fired flue-gas are processing it through scr denitrification apparatus
Afterwards, enter air preheater after the process of alkaline absorbent injection apparatus.
7. coal-fired flue-gas so according to claim 43Step deep removal method it is characterised in that: after air preheater, adjust
Position before warm enhancing device temperature descending section is additionally provided with alkaline absorbent injection apparatus, and coal-fired flue-gas are processing it through air preheater
Afterwards, enter homoiothermic enhancing device temperature descending section after the process of alkaline absorbent injection apparatus.
8. according to any one described coal-fired flue-gas so in claim 5～73Step deep removal method it is characterised in that: alkali
Property sorbent injection device in adopt alkaline absorbent be magnesium hydroxide, calcium hydroxide, sodium bisulfate, sodium carbonate, bicarbonate
Any one in calcium.
9. coal-fired flue-gas so according to claim 43Step deep removal method is it is characterised in that comprise the steps:
(1) coal-fired flue-gas from boiler out after, first pass around scr denitrification apparatus, so2/so3Conversion ratio is less than 0.8%；
(2) coal-fired flue-gas enter alkaline absorbent injection apparatus after scr denitrification apparatus, spray alkalescence absorb into flue
So in agent, alkaline absorbent and flue gas3Reaction, so3Removal efficiency more than 90%；
(3) coal-fired flue-gas enter the temperature descending section of homoiothermic enhancing device after air preheater, the temperature descending section of homoiothermic enhancing device make into
The flue-gas temperature entering electrostatic precipitator controls so below the acid dew point of flue gas so that in flue gas3It is condensed into sulfuric acid mist and inhale
It is attached to dust surface, remove after being caught by electrostatic precipitator；
(4) coal-fired flue-gas enter desulfurizing tower, the cooling effect of sprayed slurry after electrostatic precipitator, make so in flue gas3Coalescence
Grow up, the spraying layer to desulfurizing tower and demister are optimized design, improve absorption tower serosity to so in flue gas3Removing, enter
One step reduces so in flue gas3；
(5) coal-fired flue-gas, after desulfurizing tower, by the capture of wet cottrell, realize so3Concentration be less than 5mg/nm3；
(6) flue gas, after wet cottrell, enters the warming-up section of homoiothermic enhancing device, flue-gas temperature is increased to 85 DEG C,
Empty through chimney after；
(7) so in flue gas3After each pollutant catabolic gene equipment step deep removal, make so3Concentration of emission control in 5mg/
nm3Below.
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