CN106064016A - The ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration - Google Patents
The ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration Download PDFInfo
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- CN106064016A CN106064016A CN201610640832.9A CN201610640832A CN106064016A CN 106064016 A CN106064016 A CN 106064016A CN 201610640832 A CN201610640832 A CN 201610640832A CN 106064016 A CN106064016 A CN 106064016A
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- 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
- 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
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
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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
Abstract
The invention discloses a kind of ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration, absorb gas wash tower and include synchronized desulfuring and denitrifying district and dedusting area, exhaust gas inlet connects oxidation reactor, oxidation reactor connects reduction reactor, reduction reactor connects absorption gas wash tower, the side absorbing gas wash tower is provided with alkali liquor district, circulation fluid treatment region is arranged on the bottom absorbing gas wash tower, circulation fluid treatment region is arranged over synchronized desulfuring and denitrifying district, dedusting area is arranged on the top in synchronized desulfuring and denitrifying district, dedusting area is provided with electrostatic precipitator, and dedusting area is arranged over waste gas outlet.The invention has the advantages that: achieve desulphurization denitration ultra-clean dust removal integrated, take up an area few；Cost is few；Operating cost is low；Range is wide, is not only applicable to grassroot project, is also applied for off-the-shelf item and proposes mark transformation, and the project that especially land used is nervous is with the obvious advantage.
Description
Technical field
The present invention relates to a kind of desulphurization denitration and purifying and dedusting device, particularly relate to a kind of ultra-clean dedusting of exhuast gas desulfurization denitration
Integrated apparatus, belongs to combustion products process field.
Background technology
Waste gas PM2.5 is the main cause of atmospheric haze.Nitrogen oxides is the main cause causing chemical fumes, is also acid
The major reason of rain.Sulfur dioxide is the main cause of acid rain.The ultra-clean dedusting of waste gas, desulfurization and denitration are three of waste gas pollution control and treatment
Vital task.
Waste gas dedusting method mainly has cyclone dust removal, earthenware dedusting, water bath dust-removing, bag-type dust, dry type static dust
And wet static dedusting.Cyclone dust removal utilizes centrifugal dust removal, can only remove big dust particle, and outlet particle concentration is the most only
500-800mg/Nm can be reached3.Earthenware dedusting is physics dedusting, and the particulate matter in waste gas is transferred in water by water bath dust-removing,
Earthenware and water bath dust-removing can only remove PM50, and outlet particle concentration can only achieve 200-300mg/Nm3.Bag-type dust utilizes
The filtration dedusting of cloth bag, main PM10 and PM2.5 that remove, outlet particle concentration is normally controlled in 30-50mg/Nm3.Dry
Formula electrostatic precipitation utilizes the chargeding performance of particulate matter in dry waste gas, is driven by high-voltage electrostatic field and is enriched with dedusting at anode, mainly
Removing PM10, outlet particle concentration is normally controlled in 50-100mg/Nm3.PM2.5 is superfine particulate matter, and charge capacity is poor,
Grain is not more than 2.5 μm.First wet static dedusting carries out water spray humidification to waste gas, makes the steam in waste gas reach supersaturation shape
State, is greatly increased the charging performance of superfine particulate matter, then removes superfine particulate matter by high-voltage electrostatic field, mainly remove
PM2.5, outlet particle concentration can reach 5mg/Nm3Below.Cloth bag and dry type static dust outlet particulate matter are dense in theory
Degree can reach 5mg/Nm3Hereinafter, but load rate of plant reduces at double, and pressure drop is excessive, and power consumption is too high, operating cost mistake
High.Particulate matter requires to reach generally to use combination technique during ultra-clean discharge, utilizes earthenware dedusting, water bath dust-removing etc. to remove big
Grain thing, utilizes dry type static dust, bag-type dust to remove PM10, utilizes wet static dedusting to remove PM2.5.Wet static dedusting
It is the usual technique of ultra-clean dedusting and last guarantee.
Desulfurizing method of exhaust gas mainly has dry type, half dry type and wet type desulfurizing.Dry type desulfurizing feeding lime stone, magnesium oxide etc. are dry
Powder desulfurizing agent, directly with waste gas sulfur dioxide react and generate the dry product such as calcium sulfite, magnesium sulfite, then dedusting.Half
The desulfurizer slurries such as dry type desulfurizing feeding lime, magnesium oxide, sodium hydroxide, directly react generation Asia with the sulfur dioxide in waste gas
The dry product such as calcium sulfate, magnesium sulfite, then dedusting.Dry type, the advantage of half dry type desulfurization are to need not water, there is not pulp water and divide
From with water recycle problem；Shortcoming is to react not thorough, and efficiency is low, is required for dedusting before and after desulfurization, and repeated construction is serious,
Pressure drop is big, and operating cost is high.First wet type desulfurizing sprays waste gas with doctor solution, and the sulfur dioxide in waste gas is transferred to shape in water
Becoming sulfurous acid, then feeding lime, magnesium oxide, sodium hydroxide etc. neutralize acid doctor solution, and after slag-liquid separation, doctor solution follows
Ring uses.The advantage of wet type desulfurizing is that sulfur dioxide transfer velocity is fast, and efficiency is high, effective；Shortcoming is to consume water, and doctor solution needs
Want slag-liquid separation and recycle.Generally use wet type desulfurizing at present, seldom use dry type and half dry type desulfurization.
The main selective catalytic reduction method of main flow denitration technology (SCR) and SNCR method (SNCR).Its
His technology mainly has the absorption of electronic beam method (EBA), activated coke, normal temperature oxidation reducing process etc..SCR law technology is at catalyst action
Under, reducing agent NH3(liquefied ammonia, ammonia, carbamide etc.) and the NO in flue gasXReaction, by the NO in flue gasXIt is reduced to nitrogen and water.Its
Reactor is arranged between boiler economizer outlet and air preheater entrance, and reaction temperature is typically between 320 DEG C-400 DEG C.
SNCR law technology NH3, the reducing agent such as carbamide spray into the region that in-furnace temperature is 850～1100 DEG C, reducing agent with in flue gas
NOxCarry out selective reaction, NOxIt is reduced to nitrogen and water.SCR and SNCR technology be required for specific reaction temperature condition and
Strict automatically controls, and the reaction of reducing agent deficiency is not thorough, and instead excess produces the escaping of ammonia increases nitrogen oxides, results in process
Effect reduces.The high energy particle that electronic beam method utilizes electron accelerator to produce irradiates flue gas so that it is SO2And NOxOxidation generates sulphuric acid
And nitric acid, then react generation ammonium sulphate and nitric acid ammonia with the ammonia added.This technology does not has waste water, it is not necessary to catalyst, to flue gas
Condition change strong adaptability, but power consumption is big, is not also suitable for large-scale application.Active coke absorption method activated coke carries out cigarette
Desulfurization and denitrogenation while gas.SO2Being adsorbed by activated coke, by hot recycling, product is converted into the pairs such as sulfur, sulphuric acid, chemical fertilizer
Product.NOXIt is under conditions of ammonification, generates water and nitrogen through the catalytic action of activated coke and enter air again.This technology does not has
Waste water, it is not necessary to catalyst, changes strong adaptability, but operation is more complicated flue gas condition, and side-product produces complexity, carbon consumption
Greatly, tower pressure drop is big.NO is first oxidized to NO by normal temperature oxidation reducing process2, then by NO2Transfer to water becomes HNO3, finally utilize
H2SO3By HNO3It is reduced into N2Discharge.This technical matters process is similar with desulfurization, it is not necessary to reducing agent, suitable to flue gas condition change
Ying Xingqiang, moreover it is possible to noxious substances such as simultaneous oxidation two English and remove removing heavy metals etc., operating cost is low, and difficult point is oxidation and also
Former control.
Owing to technique limits, the denitration such as SCR, SNCR, activated coke absorption Tong Bu can not be carried out with desulfurization, and both can only make
For separate unit, it is impossible to realize the integration of technique and device, floor space is big, and investment is many, and operating cost is high.Only a few example
Normal temperature oxidation reduction denitration example is the most all independent denitration after desulfurization, there is same problem.Electronic beam method denitration needs
Utilizing electron accelerator to produce high energy particle, energy consumption is very big, is difficult to commercial production.
Wet type desulfurizing and normal temperature oxidation reduction denitrating technique use the mode of spray-absorption liquid by the sulfur dioxide in waste gas
Transfer to water is formed sulfurous acid and nitric acid with oxidation product nitrogen dioxide, use Calx, magnesium oxide, sodium hydroxide etc. to neutralize acid
Property absorbing liquid, produce a large amount of water smoke during spray, containing the product such as a large amount of sulphite, sulfate, nitrate in water smoke,
Need to process further.Flap demister is generally used to process.This demister efficiency is low, weak effect, water droplet in waste gas
Concentration still reaches 70-100mg/Nm3, particle concentration still reaches 30-100mg/Nm3, it is difficult to reach ultra-clean discharge standard.
In order to reach ultra-clean discharge standard, generally wet electrostatic is set after wet type desulfurizing and normal temperature oxidation reduce denitration
Dedusting.Due to the restriction of technique, the waste gas of wet type desulfurizing and normal temperature oxidation reduction denitration can only bottom-up flow.Quiet in wet type
In electric precipitation, the anode moisture film containing particulate matter relies on gravity from up to down to flow；Smooth and easy in order to ensure the flowing of moisture film, air-flow side
To being usually designed to downwards or level.Owing to wet type desulfurizing is different from the airflow direction of wet static dedusting, both only as
Separate unit, it is impossible to realize the integration of technique and device, floor space is big, and investment is many, and pressure drop is big.
Summary of the invention
It is an object of the invention to overcome weak point in prior art, and a kind of wet type desulfurizing technology, room temperature oxygen are provided
Change reduction denitration technology and wet static dedusting technology combine, define the ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration,
Exhuast gas desulfurization, denitration, ultra-clean dedusting, hazardous contaminant process etc. are carried out in set of device, substantially increase exhuast gas desulfurization,
Denitration, ultra-clean dedusting, the effect of hazardous contaminant process and efficiency, greatly reduce investment, operating cost and occupation of land face
Long-pending.
This ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration, absorbs gas wash tower and includes synchronized desulfuring and denitrifying district and dedusting
District, exhaust gas inlet connects oxidation reactor, oxidation reactor connects reduction reactor, reduction reactor connects absorption gas wash tower,
The side absorbing gas wash tower is provided with alkali liquor district, and circulation fluid treatment region is arranged on the bottom absorbing gas wash tower, on circulation fluid treatment region
Side is provided with synchronized desulfuring and denitrifying district, and dedusting area is arranged on the top in synchronized desulfuring and denitrifying district, and dedusting area is arranged over waste gas outlet.
Described electrostatic precipitator is made up of high-voltage DC power supply, polar curve, pole plate and deflector, is provided with between two two-plates
Polar curve, polar curve connects high-voltage DC power supply, and deflector is arranged on the top of dedusting area, and the bottom of waste gas outlet.
Described circulation fluid treatment region side is provided with dope elevator pump, and circulation fluid treatment region is upper with synchronized desulfuring and denitrifying district
It is provided with dosing pump between being provided with between side below circulating pump, alkali liquor district and synchronized desulfuring and denitrifying district.
Described reduction reactor is additionally added strong acid.
The invention has the advantages that:
1. integration, oxidation of nitric oxide, sulfur dioxide absorb, nitrogen dioxide absorbs, nitrogen dioxide absorption product is reduced,
In hazardous contaminant oxidation and the ultra-clean dedusting of exhaust gas particle thing, soda acid, slag-liquid separation and water recycle etc. a set of
Facility completes, it is achieved that desulphurization denitration is ultra-clean dust removal integrated.
2. taking up an area few, desulphurization denitration is ultra-clean dust removal integrated, saves floor space 50-60%；
3. cost is few, saves cost 25-30%；
4. operating cost is low, saves operating cost 20-25%；
5. range is wide, is not only applicable to grassroot project, is also applied for off-the-shelf item and proposes mark transformation, especially land used anxiety
Project with the obvious advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of the ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration.
Labelling in figure:: 1-oxidation reactor, 2-reduction reactor, 3-high-voltage DC power supply, 4-polar curve, 5-pole plate, 6-lead
Stream plate, 7-absorb gas wash tower, 8-dosing pump, 9-circulating pump, 10-dope elevator pump, 11-waste gas outlet, the process of 12-circulation fluid
District, 13-alkali liquor district, 14-synchronized desulfuring and denitrifying district, 15-dedusting area, 16-waste gas outlet.
Detailed description of the invention
Dust removal integrated plant ultra-clean to exhuast gas desulfurization denitration is further described below in conjunction with the accompanying drawings.
This ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration, absorbs gas wash tower 7 and includes synchronized desulfuring and denitrifying district 14 He
Dedusting area 15, exhaust gas inlet 11 connects oxidation reactor 1, oxidation reactor 1 connects reduction reactor 2, reduction reactor 2 connects
Absorbing gas wash tower 7, the side absorbing gas wash tower 7 is provided with alkali liquor district 13, and circulation fluid treatment region 12 is arranged on absorption gas wash tower 7 times
Portion, circulation fluid treatment region 12 is arranged over synchronized desulfuring and denitrifying district 14, and dedusting area 15 is arranged on the upper of synchronized desulfuring and denitrifying district 14
Side, dedusting area 15 is provided with electrostatic precipitator, and dedusting area 15 is arranged over waste gas outlet 16.Described electrostatic precipitator is by high straightening
Stream power supply 3, polar curve 4, pole plate 5 and deflector 6 form, and are provided with polar curve 4 between two two-plates 5, and polar curve 4 connects high-voltage DC power supply
3, deflector 6 is arranged on the top of dedusting area 15, and the bottom of waste gas outlet 16.
Described circulation fluid treatment region 12 side is provided with dope elevator pump 10, circulation fluid treatment region 12 and synchronized desulfuring and denitrifying
It is provided with dosing pump 8 between being provided with between the top in district 14 below circulating pump 9, alkali liquor district 13 and synchronized desulfuring and denitrifying district 14.
Described reduction reactor 2 is additionally added strong acid.
Specifically wet type desulfurizing technology, normal temperature oxidation reduction denitration technology and wet static dedusting technology combines, and is formed
The ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration, exhuast gas desulfurization, denitration, ultra-clean dedusting, hazardous contaminant process etc.
Carry out in set of device, substantially increase exhuast gas desulfurization, denitration, ultra-clean dedusting, the effect of hazardous contaminant process and effect
Rate, greatly reduces investment, operating cost and floor space.
Waste gas first passes through exhaust gas inlet 11 and enters oxidation reactor 1 by Viability for inertia oxidation of nitric oxide product, so
Nitric oxide bioactivity product is reduced into nitrogen by rear entrance reduction reactor 2, and waste gas subsequently enters absorption gas wash tower 7, dosing pump 8
The bottom that alkali liquor uniformly sprays absorption gas wash tower 7 carries out acid-base neutralization, and circulation fluid is uniformly sprayed absorption and removes by circulating pump 9
The top of chimney 7 absorbs soluble gas, and waste gas continuously rises to dedusting after absorbing the synchronized desulfuring and denitrifying district 14 of gas wash tower 7
District 15, high-voltage DC power supply 3 high-voltage DC power supply is dispensed into polar curve 4, and polar curve 4 electric discharge promotes water smoke and particulate matter to move to pole plate
5 form moisture film, and moisture film is fallen synchronized desulfuring and denitrifying district 14, water smoke and particulate matter along pole plate 5 flower and is removed, and purify waste gas discharge；
Circulation fluid falls into circulation fluid treatment region 12, and circulation fluid treatment region 12 supernatant continues cycling through use, circulation fluid treatment region 12 dope
It is sent to processed facility by dope elevator pump 10.
Oxidation of nitric oxide, sulfur dioxide absorb, nitrogen dioxide absorbs, nitrogen dioxide absorption product is reduced, poisonous and harmful
In pollutant oxidation and the ultra-clean dedusting of exhaust gas particle thing, soda acid, slag-liquid separation and water recycle etc. complete in a set of facility
Become.
The present embodiment exhaust gas flow 350000Nm3/ h, reaction tower diameter 6.4m, high 26.8m；Inlet exhaust sulfur dioxide is dense
Degree 600-700mg/Nm3, nitrous oxides concentration 200-300mg/Nm3, particle concentration 50-120mg/Nm3, outlet exhaust dioxy
Change sulphur concentration 15-20mg/Nm3, nitrous oxides concentration 20-30mg/Nm3, particle concentration 1-3mg/Nm3, all reach ultra-clean discharge
Standard.
Claims (4)
1. the ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration, absorbs gas wash tower (7) and includes synchronized desulfuring and denitrifying district (14)
With dedusting area (15), it is characterised in that: exhaust gas inlet (11) connects oxidation reactor (1), oxidation reactor (1) connects reduction instead
Answering device (2), reduction reactor (2) to connect and absorb gas wash tower (7), the side absorbing gas wash tower (7) is provided with alkali liquor district (13), circulation
Liquid treatment region (12) is arranged on the bottom absorbing gas wash tower (7), and circulation fluid treatment region (12) is arranged over synchronized desulfuring and denitrifying district
(14), dedusting area (15) are arranged on the top of synchronized desulfuring and denitrifying district (14), and dedusting area (15) are provided with electrostatic precipitator, dedusting area
(15) waste gas outlet (16) it is arranged over.
The ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration the most according to claim 1, it is characterised in that: described electrostatic
Cleaner unit (13) is made up of high-voltage DC power supply (5), polar curve (6), pole plate (7) and deflector (8), and two two-plates set between (7)
Having polar curve (6), polar curve (6) connects high-voltage DC power supply (5), and deflector (8) is arranged on the top of dedusting area (12), and waste gas goes out
The bottom of mouth (14).
The ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration the most according to claim 1, it is characterised in that: described circulation
Liquid treatment region (9) side is provided with dope elevator pump (4), the top in circulation fluid treatment region (9) and synchronized desulfuring and denitrifying district (11) it
Between be provided with circulating pump (3), be provided with dosing pump (5) between alkali liquor district (10) and synchronized desulfuring and denitrifying district (11) lower section.
The ultra-clean dust removal integrated plant of exhuast gas desulfurization denitration the most according to claim 1, it is characterised in that: described reduction
Reactor is additionally added strong acid in (2).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107998859A (en) * | 2017-12-21 | 2018-05-08 | 双盾环境科技有限公司 | A kind of technique of the ultra-clean processing flue gas of the dust removal integrated wet method of desulphurization denitration |
| CN108080150A (en) * | 2018-02-05 | 2018-05-29 | 北京欧美中科学技术研究院 | A kind of desulfurization high temperature electrostatic deduster |
| CN114259852A (en) * | 2021-12-23 | 2022-04-01 | 青岛蓝博环境科技有限公司 | Sludge carbonization waste gas treatment process |
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| CN107998859A (en) * | 2017-12-21 | 2018-05-08 | 双盾环境科技有限公司 | A kind of technique of the ultra-clean processing flue gas of the dust removal integrated wet method of desulphurization denitration |
| CN108080150A (en) * | 2018-02-05 | 2018-05-29 | 北京欧美中科学技术研究院 | A kind of desulfurization high temperature electrostatic deduster |
| CN114259852A (en) * | 2021-12-23 | 2022-04-01 | 青岛蓝博环境科技有限公司 | Sludge carbonization waste gas treatment process |
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