CN110115916A - The tapping equipment and technique of gas boiler flue gas - Google Patents
The tapping equipment and technique of gas boiler flue gas Download PDFInfo
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- CN110115916A CN110115916A CN201910090014.XA CN201910090014A CN110115916A CN 110115916 A CN110115916 A CN 110115916A CN 201910090014 A CN201910090014 A CN 201910090014A CN 110115916 A CN110115916 A CN 110115916A
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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
- B01D53/32—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 electrical effects other than those provided for in group B01D61/00
- B01D53/323—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 electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
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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
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
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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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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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
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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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
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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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
- B01D2258/025—Other waste gases from metallurgy plants
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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Abstract
This application discloses the tapping equipments and technique of a kind of gas boiler flue gas, wherein the technique is the following steps are included: the following steps are included: ammonia water spray carries out denitration；Reaction of low temperature plasma redox pollutant；Dry powder injection carries out depickling；Dry type static dust removes dust particles and solid-state salt particulate matter in flue gas；Bag-type dust is discharged after obtaining ultra-clean flue gas by chimney.The present invention can be realized steel mill gas boiler various pollutants of fume (NOX、SOXAnd dust) collaboration, efficiently, be removed in depth, can be good at control dust, NOXAnd SOXDischarge, realize the minimum discharge of steel mill's gas boiler flue gas, wherein NOX< 50mg/Nm3, SOX< 35mg/Nm3, dust < 5mg/Nm3；Meanwhile the advantages that present invention sprays the integrated apparatus designed with electrostatic precipitation and bag-type dust Combinatorial Optimization by treatment channel, spray ammonia, plasma reaction and dry powder, and the device is not only compact-sized, system flow is simple, operating cost is low, occupied area is small.
Description
Technical field
The present invention relates to field of air pollution purification more particularly to a kind of tapping equipments and work of steel mill's gas boiler flue gas
Skill.
Background technique
China is the big country of world steel production, and annual output ranks first in the world, and average daily steel output surpasses 2,000,000 tons.In order to
Green manufacturing is promoted, each iron and steel enterprise all pays much attention to the comprehensive utilization of the by-product gas generated in production process, removes
In each workshop section of metallurgical technology-such as hot-blast stove, converter, in heating furnace outside consumption 50%~60%, it is remaining to utilize boiler
It is converted into thermal energy or electric energy, to effectively reduce directly release bring energy waste and environmental pollution.Iron and steel enterprise's production
The by-product gas generated in the process mainly has blast furnace gas, coal gas of converter and coke-stove gas.Wherein the surplus of blast furnace gas is most
Greatly, the calorific value highest of coke-stove gas, therefore rich blast furnace gas and coke-stove gas is commonly used for power generation project.
As national steel mill's surplus gas is largely utilized, the operation of gas-driven generator kludge is more and more, but coal
Gas boiler flue gas emission but brings new atmosphere polluting problem.A large amount of pollutant is had in gas boiler flue gas, it is main
Pollutant component has dust, NOXAnd SOXDeng should especially be handled before being discharged to atmosphere.But with environment protection emission index mark
Alignment request is gradually increased, and emission control becomes more and more difficult, especially dust, NOXAnd SOXControl, it is domestic common at present
Tapping equipment can't be to dust, NOXAnd SOXCarry out good emission control.
Summary of the invention
The present invention is in view of the above-mentioned problems, propose the tapping equipment and technique of a kind of gas boiler flue gas.
The technical solution adopted by the present invention is as follows:
A kind of discharge technology of gas boiler flue gas, comprising the following steps:
A, ammonium hydroxide is sprayed, mixes ammonium hydroxide with flue gas；It is simultaneously that flue gas is cooling；
B, it is passed through reaction of low temperature plasma unit by the flue gas of step A, low-temperature plasma reactor discharges so that cigarette
Redox reaction occurs for the pollutant in gas；
C, dry powder is sprayed into the flue gas by step B, acid-base neutralization reaction occurs for the sour gas in dry powder and flue gas；
D, it is passed through dry type static dust unit by the flue gas of step C, the dry powder being sparged into continues and sour gas in flue gas
While precursor reactant, the dust particles and solid-state salt particulate matter in flue gas are removed；
E, it is passed through bag dust removal unit by the flue gas of step D, bag dust removal unit utilizes the powder in filtrate trapping flue gas
Dirt particle, dry powder particle and solid-state salt particulate matter, are discharged after obtaining ultra-clean flue gas.
The present invention by gas boiler flue gas injection ammonium hydroxide, the heat that ammonium hydroxide absorbs in flue gas be formed by evaporation to ammonia and
Vapor, ammonia are sufficiently mixed with flue gas；Simultaneously that flue gas is cooling, the relative humidity of flue gas increases, and formation one preferable net
Chemical industry condition；Flue gas after cooling is passed through reaction of low temperature plasma unit, in the strong electric discharge of reaction of low temperature plasma unit
Under effect, redox reaction occurs for the substance in flue gas, realizes NOXAnd SOXMost of removing；It is anti-to low temperature plasma
Acid-base neutralization reaction occurs for the sour gas in the flue gas injection dry powder after answering cell processing, dry powder and flue gas, in flue gas
Pollutant carries out depickling, purifies flue gas further；By dry powder, treated that flue gas enters dry type static dust unit,
It is dusted by dry type static dust unit, in this step, is generated in original dust particles and front end units in flue gas
Solid-state salt particulate matter, dry powder powder etc. can be removed largely together in dry type static dust unit；Pass through cloth later
Bag dust removing units carry out further dedusting, obtain after the flue gas of purification and are discharged.It can be seen that a variety of pollutions can be achieved in the present invention
The synchronization of object (including particulate matter, nitrogen oxides, oxysulfide) is efficiently removed in depth, and can be good at controlling dust, NOXWith
And SOXDischarge, realize the ultra-low concentration discharge of steel mill's gas boiler flue gas pollutant, wherein NOX< 50mg/Nm3, SOX<
35mg/Nm3, dust < 5mg/Nm3。
Optionally, the atomizing particle size of ammonium hydroxide is 30~50 μm in the step A.
Optionally, the power supply crest voltage of reaction of low temperature plasma unit is 80KV to 120KV in the step B；Institute
The power supply pulsewidth for stating reaction of low temperature plasma unit is 0.1 μ s to 1 μ s.
Optionally, the flue gas of step A discharge reaction time in reaction of low temperature plasma unit in stepb
For 2.5s.
Optionally, flow velocity is 2m/s to the flue gas of step A discharge in reaction of low temperature plasma unit in stepb.
The present invention also provides a kind of tapping equipment of gas boiler flue gas, including treatment channel, treatment channel from entrance to
Export direction is disposed with ammonium hydroxide jet pipe, reaction of low temperature plasma unit, dry powder jet pipe, dry type static dust unit and cloth
Bag dust removing units；The outlet end of the ammonium hydroxide jet pipe is equipped with twin spray gun, and tapping equipment further includes ammonium hydroxide supply system
System, the ammonium hydroxide supply system are connect with ammonium hydroxide jet pipe, for supplying ammonium hydroxide to ammonium hydroxide jet pipe；The outlet end of the dry powder jet pipe
Spray head is installed, tapping equipment further includes sequentially connected dry powder bunker and air blower, the air blower and the dry powder jet pipe
Connection, for the dry powder in dry powder bunker to be delivered to dry powder jet pipe and is sprayed from spray head.
For the present invention by being equipped with twin spray gun in the outlet end of ammonium hydroxide jet pipe, tapping equipment further includes that ammonium hydroxide supplies
System is answered, ammonium hydroxide supply system is connect with ammonium hydroxide jet pipe, for supplying ammonium hydroxide to ammonium hydroxide jet pipe；Ammonia is sprayed by ammonium hydroxide jet pipe
Water, the heat that ammonium hydroxide absorbs in flue gas are formed by evaporation to ammonia and vapor, and ammonia is sufficiently mixed with flue gas；It is simultaneously that flue gas is cold
But, the relative humidity of flue gas increases, and forms a preferable purification operating condition；Flue gas after cooling is passed through reaction of low temperature plasma
Unit, under the strong discharge process of reaction of low temperature plasma unit, redox reaction occurs for the substance in flue gas, realizes
NOXAnd SOXPartial removal；Meanwhile the outlet end of dry powder jet pipe is equipped with spray head, tapping equipment further includes sequentially connected dry
Powder bunker and air blower, air blower are connect with dry powder jet pipe, for by the dry powder in dry powder bunker be delivered to dry powder jet pipe and from
Spray head sprays；The dry powder of ejection carries out depickling to the flue gas pollutant after reaction of low temperature plasma cell processing；In addition, setting
Dry type static dust unit is set, to treated that flue gas is dusted by dry powder, removes original dust in most of flue gas
Solid-state salt particulate matter, dry powder powder for being generated in particle and front end units etc.；Finally carry out by bag dust removal unit into one
Dedusting is walked, the flue gas of purification and discharge are obtained.It follows that the achievable multiple pollutant of the present invention (including particulate matter, nitrogen oxidation
Object, oxysulfide) synchronization, efficiently be removed in depth, can be good at control dust, NOXAnd SOXDischarge, realize steel mill's coal
The ultra-low concentration discharge of gas boiler flue gas pollutant, wherein NOX< 50mg/Nm3, SOX< 35mg/Nm3, dust < 5mg/Nm3；Together
When, the present invention by treatment channel, ammonium hydroxide jet pipe, reaction of low temperature plasma unit, dry powder jet pipe, dry type static dust unit and
Bag dust removal unit is integrated setting so that apparatus of the present invention structure is more compact, system flow is simple, operation at
This is low, occupied area is small.
Optionally, the reaction of low temperature plasma unit use line plank frame, including plasma ground pole and etc. from
Electron discharge pole, discharge type are corona discharge；The electricity of 21 peak value of plasma power supply used by reaction of low temperature plasma unit 2
Pressure is 80KV to 120KV, and pulsewidth is 0.1 μ s to 1 μ s.Flue gas reaction time in reaction of low temperature plasma unit 2 is
2.5s；Flue gas flow rate is 2m/s；It is generated with the mixed flue gas of ammonia by plasma discharge pole 23 and plasma ground pole 22
Plasma pulse corona discharge strong effect, excitation generates strong redox reaction.Reaction of nitrogen oxides is nitre
Sour ammonia particulate matter and part NO2、HNO3, part of nitrogen oxides can be reduced to N2；SOXGas is anti-single in low-temperature plasma
In member, it can be sulfate of ammoniac by part reaction, realize partial removal purpose.
Optionally, the air blower is Roots blower, and the dry powder in dry powder bunker is calcium hydroxide or sodium bicarbonate powder, is used
In the pollutant reaction with the flue gas after reaction of low temperature plasma unit process, the sour gas in flue gas is further removed
Body.
Optionally, the dry type static dust unit includes high frequency electric source, dry electrically grounded pole and dry discharge of electricity pole；In dry type
In electrostatic precipitation unit, calcium hydroxide or little Su dry powder have enough room and time continuation to react with acid gas in flue gas；Together
When flue gas in solid-state salt particulate matter, the dry powder powder etc. that generate in original dust particles and above-mentioned apparatus removed in dry electrostatic
It is largely removed together in dirt unit 4.
Optionally, the treatment channel, ammonium hydroxide jet pipe, reaction of low temperature plasma unit, dry powder jet pipe, dry electrostatic remove
Dirt unit and bag dust removal unit are integrated setting；The setting takes up an area face so that whole device structure is more compact
Product is small.
Optionally, tapping equipment further includes chimney, for that will be discharged by the flue gas for the treatment of channel entrance.
The beneficial effects of the present invention are: the present invention sprays ammonium hydroxide by ammonium hydroxide jet pipe, ammonium hydroxide absorbs the heat quilt in flue gas
Evaporation forms ammonia and vapor, and ammonia is sufficiently mixed with flue gas；Simultaneously that flue gas is cooling, the relative humidity of flue gas increases, shape
At a preferable purification operating condition；Flue gas after cooling is passed through reaction of low temperature plasma unit, in reaction of low temperature plasma
Under the strong discharge process of unit, redox reaction occurs for the substance in flue gas, realizes NOXAnd SOXMost of removing；It is low
Treated that flue gas enters between reaction of low temperature plasma unit and dry type static dust unit for isothermal plasma reaction member,
Dry powder is sprayed by dry powder jet pipe, depickling is carried out to the pollutant in flue gas, purify flue gas further；At dry powder
Flue gas after reason enters dry type static dust unit, is dusted by dry type static dust unit, removes in most of flue gas
Solid-state salt particulate matter, dry powder powder for being generated in original dust particles and front end units etc.；Pass through bag-type dust list later
Member carries out further dedusting, obtains after the flue gas of purification and is discharged.It can be seen that the achievable multiple pollutant of the present invention (including
Particulate matter, nitrogen oxides, oxysulfide) synchronization, efficiently be removed in depth, can be good at control dust, NOXAnd SOXRow
It puts, realizes the ultra-low concentration discharge of steel mill's gas boiler flue gas pollutant, wherein NOX< 50mg/Nm3, SOX< 35mg/Nm3, powder
Dirt < 5mg/Nm3；Meanwhile compare traditional handicraft, the present invention by treatment channel, ammonium hydroxide jet pipe, reaction of low temperature plasma unit,
Dry powder jet pipe, dry type static dust unit and bag dust removal unit are integrated setting, so that apparatus of the present invention structure is tight
It gathers, system flow is simple, invests the advantages that low with operating cost, occupied area is small.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of the tapping equipment of gas boiler flue gas of the invention.
Each appended drawing reference in figure are as follows: 1, ammonium hydroxide jet pipe；2, reaction of low temperature plasma unit；3, dry powder jet pipe；4, dry type
Electrostatic precipitation unit；5, bag dust removal unit；11, ammonium hydroxide supply system；12, twin spray gun；21, plasma power supply；
22, plasma ground pole；23, plasma discharge pole；31, dry powder bunker；32, air blower；41, high frequency electric source；42, electrical ground is done
Pole；43, discharge of electricity pole is done；50, first part；51, second part；52, Part III；53, Part IV；54, Part V.
Specific embodiment:
Below with reference to each attached drawing, the present invention will be described in detail.
Fig. 1 is the structural schematic diagram of the tapping equipment of gas boiler flue gas of the invention.As shown in Figure 1, the present invention provides
A kind of tapping equipment of gas boiler flue gas, including including treatment channel, treatment channel is set gradually from entrance to export direction
There are ammonium hydroxide jet pipe 1, reaction of low temperature plasma unit 2, dry powder jet pipe 3, dry type static dust unit 4 and bag dust removal unit 5；
The outlet end of ammonium hydroxide jet pipe 1 is equipped with twin spray gun 12, and tapping equipment further includes ammonium hydroxide supply system 11, ammonium hydroxide supply
System 11 is connect with ammonium hydroxide jet pipe 1, for supplying ammonium hydroxide to ammonium hydroxide jet pipe；The outlet end of dry powder jet pipe 3 is equipped with spray head, discharge
Device further includes sequentially connected dry powder bunker 31 and air blower 32, and air blower 32 is connect with dry powder jet pipe 3, for storing dry powder
Dry powder in storehouse 31 is delivered to dry powder jet pipe 3 and sprays from spray head.
For the present invention by being equipped with twin spray gun 12 in the outlet end of ammonium hydroxide jet pipe 1, tapping equipment further includes ammonia
Water supply system 11, ammonium hydroxide supply system 11 are connect with ammonium hydroxide jet pipe 1, for supplying ammonium hydroxide to ammonium hydroxide jet pipe；It is sprayed by ammonium hydroxide
Pipe inspection ammonium hydroxide, the heat that ammonium hydroxide absorbs in flue gas are formed by evaporation to ammonia and vapor, and ammonia is sufficiently mixed with flue gas；Simultaneously
Flue gas is cooling, and the relative humidity of flue gas increases, and forms a preferable purification operating condition；Flue gas after cooling be passed through low temperature etc. from
Daughter reaction member 2, under the strong discharge process of reaction of low temperature plasma unit 2, oxidation occurs for the substance in flue gas also
Original reaction, realizes NOXAnd SOXPartial removal；Meanwhile the outlet end of dry powder jet pipe 3 is equipped with spray head, tapping equipment further includes
Sequentially connected dry powder bunker 31 and air blower 32, air blower 32 are connect with dry powder jet pipe 3, for that will do in dry powder bunker 31
Powder is delivered to dry powder jet pipe 3 and sprays from spray head；The dry powder of ejection is to through treated the flue gas of reaction of low temperature plasma unit 2
Pollutant carries out depickling；In addition, setting dry type static dust unit 4 is removed to by dry powder, treated that flue gas is dusted
Solid-state salt particulate matter, the dry powder powder etc. generated in original dust particles and front end units in most of flue gas；Most pass through afterwards
Cloth bag dust removing units 5 carry out further dedusting, obtain the flue gas of purification and discharge.It follows that the present invention can be achieved it is a variety of
The synchronization of pollutant (including particulate matter, nitrogen oxides, oxysulfide), efficiently be removed in depth, can be good at control dust,
NOXAnd SOXDischarge, realize the ultra-low concentration discharge of steel mill's gas boiler flue gas pollutant, wherein NOX< 50mg/Nm3, SOX
< 35mg/Nm3, dust < 5mg/Nm3；Meanwhile the present invention by treatment channel, ammonium hydroxide jet pipe, reaction of low temperature plasma unit,
Dry powder jet pipe, dry type static dust unit and bag dust removal unit are integrated setting, so that apparatus of the present invention structure is more
Add it is compact, system flow is simple, operating cost is low, occupied area is small.
In this present embodiment, treatment channel include the first part 50 being sequentially communicated, second part 51, Part III 52,
The cross-sectional area of Part IV 53 and Part V 54, first part 50 is less than the cross section face of second part 51 everywhere
Product, the setting of ammonium hydroxide jet pipe 1 are arranged in first part, reaction of low temperature plasma unit 2 in second part 51, the Part III
52 cross-sectional area is less than the cross-sectional area of second part 51 everywhere, again smaller than the cross section face of Part IV 53 everywhere
Product, the setting of dry powder jet pipe 3 are arranged in Part III 52, dry type static dust unit 4 in Part IV 53, bag dust removal unit 5
It is arranged in Part V 54；In the present arrangement, the cross-sectional area of first part is less than the cross-sectional area of second part, can
It concentrates the flue gas being passed through from treatment channel entrance more, mixes the ammonium hydroxide of injection adequately with flue gas, further increase
Except the efficiency of nitre sulphur removal.Meanwhile the cross-sectional area of Part III is respectively less than the cross section face of second part and Part IV
Product, the injection flue gas for enabling the dry powder of injection more to concentrate carry out the pollutant in dry powder and flue gas in sufficient soda acid
And reaction, further increase the efficiency except nitre sulphur removal.
In this present embodiment, reaction of low temperature plasma unit 2 uses line plank frame, including 22 He of plasma ground pole
Plasma discharge pole 23, discharge type are corona discharge；21 peak of plasma power supply used by reaction of low temperature plasma unit 2
Threshold voltage is 80KV to 120KV, and pulsewidth is 0.1 μ s to 1 μ s.When flue gas reacts stop in reaction of low temperature plasma unit 2
Between be 2.5s；Flue gas flow rate is 2m/s；With the mixed flue gas of ammonia by plasma discharge pole 23 and plasma ground pole 22
The strong effect of the plasma pulse corona discharge of generation, excitation generate strong redox reaction.Reaction of nitrogen oxides
For nitric acid ammonia particulate matter and part NO2、HNO3, part of nitrogen oxides can be reduced to N2；SOXGas is in low-temperature plasma
In anti-unit, it can be sulfate of ammoniac by part reaction, realize partial removal purpose.
In this present embodiment, air blower 32 is Roots blower, and the dry powder in dry powder bunker is calcium hydroxide or saleratus power
End further removes in flue gas for the pollutant reaction with the flue gas after reaction of low temperature plasma unit process
Sour gas.
In this present embodiment, dry type static dust unit includes high frequency electric source 41, dry electrically grounded pole 42 and dry discharge of electricity pole
43；In dry type static dust unit 4, calcium hydroxide or little Su dry powder have enough room and times to continue and sour gas in flue gas
Precursor reactant；Solid-state salt particulate matter, dry powder powder generated in flue gas in original dust particles and above-mentioned apparatus simultaneously etc. exists
It is largely removed together in dry type static dust unit 4.
Solid-state salt particulate matter, dry powder powder generated in original dust particles and above-mentioned apparatus in flue gas etc. is in cloth bag
It further being removed together in dust removing units 5, the concentration of pollutant reaches the requirement of minimum discharge standard in final flue gas, wherein
NOX< 50mg/Nm3, SOX< 35mg/Nm3, dust < 5mg/Nm3。
In this present embodiment, by by treatment channel, ammonium hydroxide jet pipe, reaction of low temperature plasma unit, dry powder jet pipe, dry
Formula electrostatic precipitation unit and bag dust removal unit are integrated setting, and the setting is so that whole device structure is more tight
It gathers, occupied area is small.
It can be seen from the above, the present invention is by spraying treatment channel, ammonium hydroxide jet pipe, reaction of low temperature plasma unit, dry powder
Pipe, dry type static dust unit and bag dust removal unit are integrated, and that achievable steel mill's gas boiler flue gas is arranged is a variety of
Pollutant (NOX、SOXAnd dust) collaboration, efficiently, be removed in depth, can be good at control dust, NOXAnd SOXDischarge,
Realize the ultra-low concentration discharge of steel mill's gas boiler flue gas pollutant, wherein NOX< 50mg/Nm3, SOX< 35mg/Nm3, dust
< 5mg/Nm3；Meanwhile traditional handicraft is compared, the device of the invention has simple compact-sized, system flow, investment and operation
At low cost, the advantages that occupied area is small.
The present embodiment additionally provides a kind of discharge technology of gas boiler flue gas, is carried out using the tapping equipment of the present embodiment
Implement, comprising the following steps:
A, ammonium hydroxide is sprayed, mixes ammonium hydroxide with flue gas；It is simultaneously that flue gas is cooling；
B, it is passed through reaction of low temperature plasma unit by the flue gas of step A, low-temperature plasma reactor discharges so that cigarette
Redox reaction occurs for the pollutant in gas；
C, dry powder is sprayed into the flue gas by step B, acid-base neutralization reaction occurs for the sour gas in dry powder and flue gas；
D, it is passed through dry type static dust unit by the flue gas of step C, the dry powder being sparged into continues and sour gas in flue gas
While precursor reactant, the dust particles and solid-state salt particulate matter in flue gas are removed；
E, it is passed through bag dust removal unit by the flue gas of step D, bag dust removal unit utilizes the powder in filtrate trapping flue gas
Dirt particle, dry powder particle and solid-state salt particulate matter, are discharged after obtaining ultra-clean flue gas.
The present invention by gas boiler flue gas injection ammonium hydroxide, the heat that ammonium hydroxide absorbs in flue gas be formed by evaporation to ammonia and
Vapor, ammonia are sufficiently mixed with flue gas；Simultaneously that flue gas is cooling, the relative humidity of flue gas increases, and formation one preferable net
Chemical industry condition；Flue gas after cooling is passed through reaction of low temperature plasma unit, in the strong electric discharge of reaction of low temperature plasma unit
Under effect, redox reaction occurs for the substance in flue gas, realizes NOXAnd SOXMost of removing；It is anti-to low temperature plasma
Acid-base neutralization reaction occurs for the sour gas in the flue gas injection dry powder after answering cell processing, dry powder and flue gas, in flue gas
Pollutant carries out depickling, purifies flue gas further；By dry powder, treated that flue gas enters dry type static dust unit,
It is dusted by dry type static dust unit, in this step, is generated in original dust particles and front end units in flue gas
Solid-state salt particulate matter, dry powder powder etc. can be removed largely together in dry type static dust unit；Pass through cloth later
Bag dust removing units carry out further dedusting, obtain after the flue gas of purification and are discharged.It can be seen that a variety of pollutions can be achieved in the present invention
The synchronization of object (including particulate matter, nitrogen oxides, oxysulfide) is efficiently removed in depth, and can be good at controlling dust, NOXWith
And SOXDischarge, realize the ultra-low concentration discharge of steel mill's gas boiler flue gas pollutant, wherein NOX< 50mg/Nm3, SOX<
35mg/Nm3, dust < 5mg/Nm3。
When practice, bag dust removal unit is to be filtered using the filtration of fabric to dusty gas, when
After dusty gas enters sack cleaner, particle is big, heavy dust since the effect of gravity settles down falls into ash bucket,
For gas containing relatively fine dust when passing through filtrate, dust is purified flue gas by detention.
In this present embodiment, the atomizing particle size of ammonium hydroxide is 30~50 μm in step A.
In this present embodiment, the power supply crest voltage of reaction of low temperature plasma unit is 80KV to 120KV in step B；
The power supply pulsewidth of the reaction of low temperature plasma unit is 0.1 μ s to 1 μ s.
In this present embodiment, the flue gas of step A discharge reacts in reaction of low temperature plasma unit in stepb when stopping
Between be 2.5s.
In this present embodiment, flow velocity is 2m/ to the flue gas of step A discharge in reaction of low temperature plasma unit in stepb
s。
The above description is only a preferred embodiment of the present invention, not thereby limits scope of patent protection of the invention, all
It is directly or indirectly to be used in other relevant technologies with equivalent structure transformation made by description of the invention and accompanying drawing content
Field similarly includes within the scope of the present invention.
Claims (10)
1. a kind of discharge technology of gas boiler flue gas, which comprises the following steps:
A, ammonium hydroxide is sprayed, mixes ammonium hydroxide with flue gas；It is simultaneously that flue gas is cooling；
B, it is passed through reaction of low temperature plasma unit by the flue gas of step A, low-temperature plasma reactor discharges so that in flue gas
Pollutant occur redox reaction；
C, dry powder is sprayed into the flue gas by step B, acid-base neutralization reaction occurs for the sour gas in dry powder and flue gas；
D, it is passed through dry type static dust unit by the flue gas of step C, the dry powder being sparged into continues anti-with acid gas in flue gas
While answering, the dust particles and solid-state salt particulate matter in flue gas are removed；
E, it is passed through bag dust removal unit by the flue gas of step D, bag dust removal unit utilizes the dust in filtrate trapping flue gas
Grain, dry powder particle and solid-state salt particulate matter, are discharged after obtaining ultra-clean flue gas.
2. the discharge technology of gas boiler flue gas as described in claim 1, which is characterized in that the mist of ammonium hydroxide in the step A
Changing partial size is 30~50 μm.
3. the discharge technology of gas boiler flue gas as described in claim 1, which is characterized in that in the step B low temperature etc. from
The power supply crest voltage of daughter reaction member is 80KV to 120KV；The power supply pulsewidth of the reaction of low temperature plasma unit is
0.1 μ s to 1 μ s.
4. the discharge technology of gas boiler flue gas as described in claim 1, which is characterized in that the flue gas of the step A discharge
Reaction time is 2.5s in reaction of low temperature plasma unit in stepb.
5. the discharge technology of gas boiler flue gas as described in claim 1, which is characterized in that the flue gas of the step A discharge
Flow velocity is 2m/s in reaction of low temperature plasma unit in stepb.
6. a kind of tapping equipment of gas boiler flue gas, which is characterized in that for implementing described in 5 any one of Claims 1 to 5
Blast furnace gas burning flue gas discharge technology, the tapping equipment includes: treatment channel, and treatment channel is from entrance to exporter
To being disposed with ammonium hydroxide jet pipe, reaction of low temperature plasma unit, dry powder jet pipe, dry type static dust unit and bag-type dust
Unit；The outlet end of the ammonium hydroxide jet pipe is equipped with twin spray gun, and tapping equipment further includes ammonium hydroxide supply system, described
Ammonium hydroxide supply system is connect with ammonium hydroxide jet pipe, for supplying ammonium hydroxide to ammonium hydroxide jet pipe；The outlet end of the dry powder jet pipe is equipped with
Spray head, tapping equipment further include sequentially connected dry powder bunker and air blower, and the air blower is connect with the dry powder jet pipe, are used
In by the dry powder in dry powder bunker be delivered to dry powder jet pipe and from spray head spray.
7. the tapping equipment of gas boiler flue gas as claimed in claim 6, which is characterized in that the reaction of low temperature plasma
Unit uses line plank frame, including plasma ground pole and plasma discharge pole, discharge type are corona discharge.
8. the tapping equipment of gas boiler flue gas as claimed in claim 6, which is characterized in that the dry type static dust unit
Including high frequency electric source, dry electrically grounded pole and dry discharge of electricity pole.
9. the tapping equipment of gas boiler flue gas as claimed in claim 6, which is characterized in that the treatment channel, ammonium hydroxide spray
Pipe, reaction of low temperature plasma unit, dry powder jet pipe, dry type static dust unit and bag dust removal unit are integrated and set
It sets.
10. the tapping equipment of gas boiler flue gas as claimed in claim 6, which is characterized in that the air blower is Roots's drum
Blower, tapping equipment further include chimney, for that will be discharged by the flue gas for the treatment of channel entrance.
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| CN201910090014.XA CN110115916A (en) | 2019-01-30 | 2019-01-30 | The tapping equipment and technique of gas boiler flue gas |
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