CN106582236A - Method and device for combined removal of SO2/NOx/PM2.5/Hg in coal-fired smoke - Google Patents
Method and device for combined removal of SO2/NOx/PM2.5/Hg in coal-fired smoke Download PDFInfo
- Publication number
- CN106582236A CN106582236A CN201611131300.9A CN201611131300A CN106582236A CN 106582236 A CN106582236 A CN 106582236A CN 201611131300 A CN201611131300 A CN 201611131300A CN 106582236 A CN106582236 A CN 106582236A
- Authority
- CN
- China
- Prior art keywords
- gas
- denitration demercuration
- denitration
- demercuration
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a method and device for combined removal of SO2/NOx/PM2.5/Hg in coal-fired smoke. The device comprises a multifunctional washing absorption tower, a pulp preparing tank and a pulp circulation tank. The washing absorption tower is divided into a denitration, demercuration and PM2.5 removal section at the upper portion, and a wet desulphurization section at the lower portion. The coal-fired smoke enters the wet desulphurization section of the multifunctional washing absorption tower from the bottom, after desulfuration is conducted through limestone pulp, smoke enters the denitration, demercuration and PM2.5 removal section and is in countercurrent contact with an absorbent added from the top, and NO and elemental mercury are removed; and meanwhile, in the high-temperature wet smoke and low-medium-temperature washing liquid countercurrent contact process in the denitration, demercuration and PM2.5 removal section, the smoke is subjected to humidity increasing cooling and is in a hyper-saturated state, hyper-saturated steam is subjected to the phase change with PM2.5 as a condensation nucleus, the granularity of PM2.5 is increased, and PM2.5 is captured by the washing liquid and a demister. By means of the method and device, the situation that most part of oxidization agents and urea are consumed in the SO2 removal process can be avoided, and the running expense of the adsorbent is obviously reduced.
Description
Technical field
The invention belongs to coal-fired power station boiler, Industrial Boiler flue gas multiple pollutant Collaborative Control technical field, more particularly to
SO in one kind joint removing coal-fired flue-gas2/NOx/PM2.5The method and device of/Hg.
Background technology
China's coal reserves enriches, and coal accounts for more than the 60% of primary energy consumption proportion, for a long time the energy based on coal
Structure also results in increasingly serious atmosphere polluting problem.Coal burning produce sulfur dioxide, nitrogen oxides, fine particle,
Hydrargyrum is the major reason for causing acid rain, photochemical pollution, haze weather, soil and pollution of waterhead.For this purpose, China is dirty for these
Increasingly stricter standard has been formulated in dye thing discharge.SO in coal-fired flue-gas2、NOx, fine particle and hydrargyrum emission control be current
The vital task of atmosphere pollution control field.
At present, coal-fired power station boiler, Industrial Boiler flue gas Treatment process it is more, wherein technology maturation and representative
Desulfurization technology have limestone-gypsum method, ammonia process, Dual alkali etc., though slurry wash process can be assisted under Wet Flue Gas Desulfurization Technology
With the coarse powder dirt in removing flue gas, but due to there is slurry spraying entrainment, desulfurization product crystallization, can cause on the contrary
PM2.5The problem that concentration of emission increases, and for water-fast Hg0And NO, catch effect pole not notable；Denitration technology is main
Selective catalytic reduction method (SCR), SNCR method (SNCR) combine low-NO_x combustion technology etc., wherein SCR skills
There is the problems such as catalyst costs are high, and catalyst regeneration is difficult in art, SNCR denitration is then difficult to ensure that denitration efficiency, and only relies on low
Nitrogen combustion technology is extremely difficult to discharge standard；Fine Particles technology have after wet desulfurization system set up wet electrical dust precipitator,
, there is investment cost height, removal effect in electric bag complex technique etc.；The flue gas demercuration technology country starts late,
Demercuration adsorbent be it is currently the only it is a kind of can be with the technology of business application, wherein activated carbon in terms of coal-fired plant flue gas Mercury vacancy
Adsorbent high cost, flying dust, Ca-base adsorbent etc. are still in conceptual phase.In general, the above technical equipment is all almost
Can only be removed for Single Pollution thing, and tedious process, greatly, operation expense is high for floor space, therefore, further grind
Send out coal-fired flue-gas SO2、NOx、PM2.5, Hg coordination techniques be trend of the times, have broad application prospects.
Existing coal-fired flue-gas combined desulfurization and denitration demercuration dedusting technology is developed by combined desulfurization and denitration technology mostly,
This is because many desulphurization denitration technologies have certain demercuration dust removing effects simultaneously, it is such as de- based on most of power plant's wet flue gas
The wet method combined desulfurization denitration demercuration dedusting technology of sulfur system, the key of the technology is for NO, Hg in process of wet desulphurization0's
The low problem of dissolubility, using various strong oxidizers are added, by water-fast NO, Hg0It is oxidized into NO2、Hg2+, and then
SO is realized in desulfurization washing tower2、NOx, Hg joint removing.Although program technical feasibility in principle, existing research is still deposited
In various problems, such as：Gaseous oxidation absorption technique based on calcium base wet-process is by adding ozone, Cl2Aoxidize Deng NO, Hg is improved
Rate, can greatly enhance removal effect of the WFGD system for NO, Hg, but operating cost is high, and gas transport storage is difficult；Carbamide is assisted
Refer to oxidative absorption technique and introduce NO in existing wet desulfurizing processxAbsorbent carbamide and sorbefacient strong oxidizer, make
Original wet method fume desulfurizing system has denitration function simultaneously, but due to SO in flue gas2Concentration is typically much higher than NO, Hg, plus
Most of oxidant, the carbamide for entering all is consumed in SO2Oxidation, subtractive process, carbamide, the oxygen higher with respect to limestone price
A large amount of additions of agent cause operating cost to increase, additionally due to carbamide denitration product mixes with desulfurization product, resource
Using being difficult to；Existing desulfurization denitration demercuration technology is not paid special attention to dedusting, in desulfurization denitration demercuration
During it is also possible to making PM2.5Concentration increases.This invention address that exploitation this new product, can effectively make up the above this
The deficiency of a little techniques, reduces operating cost and floor space, for Collaborative Control multiple pollutant has highly important meaning
Justice.
The content of the invention
The purpose of the present invention is for coal-fired power station boiler, Industrial Boiler flue gas SO2、NOx, Hg individual processing investment operation
It is costly, there is provided SO in one kind joint removing coal-fired flue-gas2/NOx/PM2.5The method and device of/Hg.
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
SO in one kind joint removing coal-fired flue-gas2/NOx/PM2.5The device of/Hg, including it is multi-functional washing absorption tower, fresh
Lime stone slurry make-up tank, lime stone slurry circulating slot, desulfuration demercuration serum recycle groove and fresh denitration demercuration River Bank Stability groove.
The multi-functional washing absorption tower is disposed with from the bottom to top the de- PM of wet desulphurization section, denitration demercuration2.5Section.Institute
State washing absorption tower bottom and be provided with gas approach, top and be provided with exhanst gas outlet.Coal-fired flue-gas import is arranged on the wet desulphurization
Duan Shang, neat stress outlet is arranged on the de- PM of the denitration demercuration2.5Duan Shang.The wet desulphurization section and the de- PM of denitration demercuration2.5Section
Between the gas cap or liquid collecting slot device for only passing through for flue gas is set.The denitration demercuration on top is taken off PM by the gas cap or collecting tank2.5
Section, the respective serum recycle of wet desulphurization section of bottom separate.
Using spray tower structure, inside is provided with desulfurization slurry spraying layer, the desulfurization slurry spray to the wet desulphurization section
Layer is connected with the lime stone slurry circulating slot being located at outside multi-functional washing absorption tower by pipeline by desulfurization slurry circulating pump；
The desulfurizer slurry spraying layer is arranged between coal-fired flue-gas import and the gas cap or liquid collecting slot device.
The wet desulphurization section is provided with lime stone slurry entrance and lime stone slurry outlet.The lime stone slurry entrance and
Lime stone slurry outlet is connected with the lime stone slurry circulating slot.The desulfurizer slurry spraying layer and the limestone slurry
Liquid circulating slot is connected, and is imported in the serosity in the lime stone slurry circulating slot by the circulating pump of the outside described de-
In sulfur agent serosity spraying layer, serum recycle loop is constituted.
The denitration demercuration takes off PM2.5Duan Caiyong filler tower structures, inside is provided with packing layer, and described filler layer is arranged on institute
State between gas cap or collecting tank and neat stress outlet.
The denitration demercuration takes off PM2.5Section is provided with denitration demercuration injection point and denitration demercuration serum outlet.The denitration takes off
Hydrargyrum injection point and denitration demercuration serum outlet are connected with the denitration demercuration serum recycle groove.The denitration demercuration serosity Jing
The denitration demercuration injection point takes off PM from denitration demercuration2.5Duan Shangfang enters the inner stuffing, occurs with flue gas in filler
Denitration demercuration serum outlet described in Jing is connected with denitration demercuration serum recycle groove after gas-to-liquid contact and reaction, configured described de-
Nitre demercuration takes off PM2.5Circulating pump outside section leads back the de- PM of the denitration demercuration2.5Section, constitutes serum recycle loop.
The denitration demercuration takes off PM2.5Demister is additionally provided with section, the demister is arranged in the denitration demercuration serosity
Entrance top.
The fresh limestone River Bank Stability groove connects lime stone slurry circulating slot by pipeline, and limestone is added to described
Fresh limestone River Bank Stability groove, is re-introduced into the lime stone slurry circulating slot.
The fresh denitration demercuration River Bank Stability groove connects desulfuration demercuration serum recycle groove by pipeline.Carbamide and the liquid
Phase oxidation agent is to add the fresh denitration demercuration River Bank Stability groove, is re-introduced into the denitration demercuration serum recycle groove.
It is provided with above the desulfurization slurry spraying layer into cold-air duct, after flue gas wet desulphurization section desulfurization described in,
Add cold air in the saturated flue gas after desulfurization, make the saturated flue gas reach hypersaturated state, cold air addition is de-
The 10～20% of sulfur saturated flue gas volume, air temperature is lower than desulfurization saturated flue gas more than 40 DEG C, so that desulfurization saturation cigarette
Flue gas degree of supersaturation S increases to S=1.05～1.20 by S ≈ 1.00 after gas mixes with cold air.
Denitration demercuration serosity into packing layer completes denitration demercuration except PM2.5Jing gas caps or collecting tank are collected after flow process
Denitration demercuration serum recycle groove is returned to by pipeline.
Invention additionally discloses SO in a kind of joint removing coal-fired flue-gas using said apparatus2/NOx/PM2.5The method of/Hg, bag
Include following steps：
The wet type desulfurizing stage：Flue gas initially enters the wet desulphurization section of multi-functional washing absorption tower bottom, de- with from wet method
The lime stone slurry counter current contacting that sulfur section top sprays into, removes SO during haptoreaction2, flue gas is humidified and in wet method
Desulfurization section top reaches saturation；
Saturated flue gas humidification stage：Adding cold air in saturated flue gas after desulfurization makes flue gas reach hypersaturated state；
Denitration demercuration takes off PM2.5Stage：Flue gas enters the de- PM of denitration demercuration of multi-functional washing absorption tower2.5Section, from denitration
Demercuration takes off PM2.5Pars infrasegmentalis is sailed against the current by the filler hole of packing layer, and the denitration with packing layer top spray to packing layer takes off
Hydrargyrum serosity close contact reacts, NO, the Hg in flue gas0NO is oxidized to respectively2、Hg2+, and then washed removing；
In the de- PM of denitration demercuration2.5In section, during high temperature saturated flue gas and the de- liquid counter current contacting of middle low-temperature denitration demercuration,
Flue gas is humidified and cools down and reach hypersaturated state, and oversaturated steam is in PM2.5Coring and condense in surface, PM there is2.5Granularity increases
Greatly, the dust-laden drop of condensation growth is removed by denitration demercuration serosity and demister；The PM of removing2.5Except in original coal-fired flue-gas
PM2.5Outward, also including the PM formed in desulfurization washing2.5, including SO3Acid mist drop, inorganic salt microgranule.
Jing desulfurization and removing PM2.5Purifying smoke afterwards is discharged from the exhanst gas outlet of function washing absorption column overhead；Desulfurization is produced
Thing enters lime stone slurry circulating slot by pipeline, excludes from lime stone slurry circulation trench bottom；Carbamide denitration product is by pipe
Road enters denitration demercuration serum recycle groove, discharges from denitration demercuration serum recycle trench bottom.
The de- liquid of the denitration demercuration is made up of carbamide, Oxygen in Liquid agent；The denitration demercuration absorption liquid temp ratio is entered to be filled out
The flue-gas temperature of material is low more than 20 DEG C.The Oxygen in Liquid agent is one or more combination of following material：Ammonium persulfate., diformazan
Base sulfoxide, sodium hypochlorite, sodium chlorite, hydrogen peroxide, potassium hydrogen persulfate, ethylenediamine, triethanolamine, bleaching powder.
The invention has the advantages that：
1. compared with the technologies such as WFGD, SCR, wet electrical dust precipitator, the device can be while efficient removal multiple pollutant, carries
The high efficiency of gas pollution control.And the apparatus main body simple structure, floor space is little, and investment cost is few, operation maintenance into
This is low.
2. Oxygen in Liquid agent, carbamide price are higher than limestone, and SO in coal-fired flue-gas2Concentration is generally significantly higher then NO, hydrargyrum,
So that most of oxidant, carbamide are consumed in SO2Oxidation removal during, the carbamide and oxidant of a large amount of additions make operation into
This increase.The present invention uses lime stone slurry to be only used for desulfurization denitration demercuration as absorbent, carbamide and oxidant in desulfurization section
De- PM2.5During, although need to suitably increase and need to build respectively limestone, denitration demercuration serum recycle because absorbing tower
The equipment such as groove and make-up tank, investment cost can increased, but the expense for purchasing oxidant and carbamide will be substantially reduced.
3. carbamide denitration product and desulfurization product Gypsum Fibrosum separate, it is possible to achieve the recycling of desulphurization denitration product.
4. by the Hg in flue gas while wet desulphurization2+Together washing removing, it is difficult to the Hg being removed0Can be in denitration
Simultaneously secondary removing is carried out, substantially increase the removal efficiency of hydrargyrum.And this technique is without being individually reconfigured at demercuration system, phase
Than in the mercury removal device for industrially independently using, greatling save expenses of environmental protection and floor space, the economic effect of enterprise is improve
Benefit.
5. compared with desulfurization denitration demercuration coordination technique before, the present invention has efficient removal PM simultaneously2.5Ability.
Add cold air in the saturated flue gas after desulfurization, make the saturated flue gas reach hypersaturated state, oversaturated steam
In PM2.5Coring and condense in surface, PM there is2.5Granularity increases, the dust-laden drop of condensation growth by the denitration demercuration absorbing liquid and
The demister removing.
6. wet desulphurization section takes off PM with denitration demercuration2.5Section is connected up and down but relatively independent mutually, can be according to each in flue gas
Pollutant levels height is adjusted flexibly two sections of height, improves pollutant removing efficiency.
Description of the drawings
Fig. 1：The apparatus structure schematic diagram of the present invention.
In figure：1. fresh limestone River Bank Stability groove；2. lime stone slurry circulating slot；3-1. wet desulphurization sections；3-2. it is de-
Nitre demercuration takes off PM2.5Section；4. gas cap or collecting tank；5. denitration demercuration serum recycle groove；6. fresh denitration demercuration River Bank Stability groove；
7. desulfurization slurry spraying layer；8. filler；9. demister；10. desulfurization slurry circulating pump；11. denitration demercuration slurry circulating pumps.
Specific embodiment
With reference to specific embodiment, the invention will be further described.
As shown in figure 1, SO in a kind of joint removing coal-fired flue-gas of the present invention2/NOx/PM2.5The device of/Hg, mainly by wrapping
The 3-1 of section containing wet desulphurization, denitration demercuration take off PM2.5Multi-functional washing absorption tower, the fresh limestone River Bank Stability of section 3-2 compositions
Groove 1, lime stone slurry circulating slot 2, desulfuration demercuration serum recycle groove 5, fresh denitration demercuration River Bank Stability groove 6 are constituted.Wet method takes off
Sulfur section 3-1 is located at the de- PM of denitration demercuration2.5Section 3-2 lower sections, centre is provided with gas cap or collecting tank 4 by two sections of respective serum recycles
Separate, due to SO2, carbamide there are corrosivity, multi-functional washing absorption tower and gas cap or collecting tank 4 adopt resistant material system
Make.Wet desulphurization section 3-1 is provided with desulfurization slurry spraying layer 7 using spray tower structure, inside, nozzle can select solid-cone (type) nozzle or
Spiral nozzle.Desulfurization slurry spraying layer 7 is by pipeline and the lime stone slurry circulating slot 2 being located at outside multi-functional washing absorption tower
It is connected by desulfurization slurry circulating pump 10.Cold air is added in the top of desulfurization slurry spraying layer 7.Denitration demercuration takes off PM2.5Section 3-2
Using filler tower structure, inside is provided with filler 8, and the top of filler 8 is provided with demister 9.Denitration demercuration serosity is from denitration demercuration serosity
The Jing denitration demercurations slurry circulating pump 11 of circulating slot 5 enters filler 8 from top, completes denitration demercuration except PM2.5Jing gas caps after flow process
Or return to denitration demercuration serum recycle groove 5 after the collection of collecting tank 4.The update mode of desulfurizing agent is to fresh limestone River Bank Stability
Limestone is added in groove 1, then fresh desulfurizing agent is introduced by lime stone slurry from fresh limestone River Bank Stability groove 1 by pipeline and followed
Annular groove.Equally, the update mode of denitration demercuration serosity is that carbamide and oxidation are added in fresh denitration demercuration River Bank Stability groove 6
Agent, then fresh denitration demercuration serosity is introduced by denitration demercuration serum recycle from fresh denitration demercuration River Bank Stability groove 6 by pipeline
Groove 5.
SO in one kind joint removing coal-fired flue-gas2/NOx/PM2.5The method of/Hg is：From coal-fired power station boiler or industrial pot
The flue gas of stove initially enters wet desulphurization section 3-1 of multi-functional washing absorption tower bottom, sprays into from the top of wet desulphurization section 3-1
Lime stone slurry counter current contacting, SO is removed during haptoreaction2, flue gas be humidified and wet desulphurization section 3-1 top
Portion reaches saturation.Adding cold air in saturated flue gas after desulfurization makes flue gas reach hypersaturated state, cold air addition
Measure as the 10～20% of desulfurization saturated flue gas volume, air temperature is lower than desulfurization saturated flue gas more than 40 DEG C, so that desulfurization
Flue gas degree of supersaturation S increases to S=1.05～1.20 by S ≈ 1.00 after saturated flue gas mix with cold air.Flue gas is in denitration demercuration
De- PM2.5Section 3-2 is sailed against the current from bottom by the hole of filler 8, with the reaction of denitration demercuration serosity close contact, NO, Hg0Respectively
It is oxidized to NO2、Hg2+, and then wash removing.The de- liquid of denitration demercuration is made up of carbamide, Oxygen in Liquid agent, and Oxygen in Liquid agent is following
One or more combination of material：Ammonium persulfate., dimethyl sulfoxide, sodium hypochlorite, sodium chlorite, hydrogen peroxide, potassium hydrogen persulfate,
Ethylenediamine, triethanolamine, bleaching powder.In the de- PM of denitration demercuration2.5High temperature saturated flue gas and middle low temperature absorption liquid counter current contacting in section
During, flue gas is humidified and cools down and reach hypersaturated state, and it is lower 20 DEG C than import cigarette temperature that the denitration demercuration absorbs liquid temp
More than.In the de- PM of denitration demercuration2.5Section 3-2, oversaturated steam is in PM2.5Coring and condense in surface, PM there is2.5Granularity increases, and coagulates
The dust-laden drop that knot is grown up is removed by denitration demercuration serosity and demister 9.The PM of removing2.5Except the PM in original coal-fired flue-gas2.5
Outward, also including the PM formed in desulfurization washing2.5, such as SO3Acid mist drop, inorganic salt microgranule etc.；Jing desulfurization and removing PM2.5Afterwards net
Change flue gas to discharge from tower top exhanst gas outlet.Desulfurization product is excluded from the bottom of lime stone slurry circulating slot 2, and carbamide denitration product is from de-
The bottom of nitre demercuration serum recycle groove 5 is discharged, can in addition recycling.
With reference to embodiments the invention will be further described, but the present invention is not limited solely to this embodiment.
Embodiment 1
Flue gas is produced by fully-automatic coal-fired boiler, and exhaust gas volumn is 300Nm3/ h, SO2And NO is provided by air distribution system, by matter
Amount effusion meter control SO2Concentration in flue gas is 2286mg/m3, NO concentration in flue gas is 1071mg/m3, it is aided with SAG-410
Type aerosol generator adds appropriate burned-coal fly ash in flue gas, makes dust content in coal-fired flue-gas be 4750mg/m3, wherein
PM2.5Concentration is 165mg/m3。
Multi-functional washing absorbing tower footpath 200mm, total high 4600mm, except filler interval adopts glass cylinder shell, other
Part is using 316 type stainless steel materials or anti-corrosion accessory.The high 2800mm of wet desulphurization section, using spray tower structure, inside sets
There are three layers of spray, using spiral nozzle.Denitration demercuration takes off PM2.5The high 1800mm of section, using filler tower structure, packing layer is adopted
250Y type corrosion resistant plate corrugated regular fillers, filler floor height 900mm, denitration demercuration takes off PM2.5Section top is installed by deflection plate demisting
Device.Ash-laden gas initially enters wet desulphurization section, the lime stone slurry counter current contacting sprayed into top, in catalytic process
Middle removing SO2, desulfurization inlet flue gas temperature is 181 DEG C, Jing three-levels spray, liquid-gas ratio 15L/Nm3, temperature is reduced to 105 DEG C, relatively wet
Degree increases to 74.5%.The de- PM of denitration demercuration is entered in flue gas2.5The cold air that temperature is 25 DEG C, cold air addition are passed through before section
Measure as the 20% of desulfurization saturated flue gas volume, make wet flue gas reach supersaturation, oversaturated steam is in PM2.5There is core in surface
Change and condense, dust-laden drop condensation growth.In the de- PM of denitration demercuration2.5Section entrance, to 85 DEG C, denitration demercuration serosity is adopted cigarette temperature drop
Carbamide and bleaching powder are configured, and temperature is 20 DEG C.Flue gas counter current contacting reaction, Jing denitration demercurations in filler with denitration demercuration serosity
De- PM2.5Section top demister removed and discharged after drop.The parallel full-automatic smoke dust sampler test of Jing WJ-60B type pitot tubes, it is many
Function washing absorption tower outlet dust concentration is 72mg/m3；Wherein, it is many using Electrical low pressure impactor ELPI on-line testings
PM2.5Mass concentration is 23mg/m3.The many J2KN Pro types Multifunctional smoke analyser tests of Jing, the outlet of function washing absorption tower
SO2, NO mass concentrations be respectively 207.5mg/m3、318.5mg/m3。
Comparative example 1
Wet desulphurization section top is not passed through cold air, and remaining is with embodiment 1.Jing is determined, and denitration demercuration takes off PM2.5Section entrance
Flue-gas temperature is 105 DEG C, and multi-functional washing absorption tower outlet dust concentration is 114mg/m3, PM2.5Mass concentration is 43mg/m3,
Function washing absorption tower exports SO2, NO mass concentrations be respectively 247.4mg/m3、351.1mg/m3。
Claims (8)
1. a kind of joint removes SO in coal-fired flue-gas2/NOx/PM2.5The device of/Hg, it is characterised in that：Inhale including multi-functional washing
Receive tower, fresh limestone River Bank Stability groove, lime stone slurry circulating slot, desulfuration demercuration serum recycle groove and fresh denitration demercuration slurry
Liquid make-up tank；
The washing absorption tower bottom is provided with gas approach, top and is provided with exhanst gas outlet, and the washing absorption tower is de- including wet method
Sulfur section and the de- PM of denitration demercuration2.5Section；The wet desulphurization section is located at the de- PM of denitration demercuration2.5Section lower section, centre be provided with gas cap or
Collecting tank separates two sections of respective serum recycles；
Using spray tower structure, inside is provided with desulfurization slurry spraying layer to the wet desulphurization section, and the desulfurization slurry spraying layer leads to
Piping is connected with the lime stone slurry circulating slot being located at outside multi-functional washing absorption tower by desulfurization slurry circulating pump；
The denitration demercuration takes off PM2.5Duan Caiyong filler tower structures, inside is provided with packing layer, is provided with above described filler layer and removes
Day with fog, denitration demercuration serosity takes off PM from denitration demercuration serum recycle groove Jing denitration demercurations slurry circulating pump from denitration demercuration2.5Duan Shang
Side enters packing layer；
The fresh limestone River Bank Stability groove connects lime stone slurry circulating slot by pipeline；
The fresh denitration demercuration River Bank Stability groove connects desulfuration demercuration serum recycle groove by pipeline.
2. joint according to claim 1 removes SO in coal-fired flue-gas2/NOx/PM2.5The device of/Hg, it is characterised in that：
The desulfurization slurry spraying layer top is provided with into cold-air duct.
3. joint according to claim 1 removes SO in coal-fired flue-gas2/NOx/PM2.5The device of/Hg, it is characterised in that：Enter
The denitration demercuration serosity for entering packing layer completes denitration demercuration except PM2.5Jing pipelines are returned Jing after gas cap or collecting tank are collected after flow process
To denitration demercuration serum recycle groove.
4. it is a kind of to remove SO in coal-fired flue-gas using claim 1-3 described device joint2/NOx/PM2.5The method of/Hg, it is special
Levy and be：Comprise the following steps：
1) flue gas initially enters the wet desulphurization section of multi-functional washing absorption tower bottom, with the stone sprayed into from wet desulphurization section top
Lime stone serosity counter current contacting, removes SO during haptoreaction2, flue gas is humidified and reaches at the top of wet desulphurization section full
And state；
2) adding cold air in the saturated flue gas after desulfurization makes flue gas reach hypersaturated state；
3) flue gas enters the de- PM of denitration demercuration of multi-functional washing absorption tower2.5Section, from the de- PM of denitration demercuration2.5Pars infrasegmentalis is by filling out
The filler hole of the bed of material is sailed against the current, and is reacted with the denitration demercuration serosity close contact of packing layer top spray to packing layer, cigarette
NO, Hg in gas0NO is oxidized to respectively2、Hg2+, and then washed removing；
4) in the de- PM of denitration demercuration2.5In section, during high temperature saturated flue gas and the de- liquid counter current contacting of middle low-temperature denitration demercuration, cigarette
Gas is humidified and cools down and reach hypersaturated state, and oversaturated steam is in PM2.5Coring and condense in surface, PM there is2.5Granularity increases,
The dust-laden drop of condensation growth is removed by denitration demercuration serosity and demister；
5) Jing desulfurization and removing PM2.5Purifying smoke afterwards is discharged from the exhanst gas outlet of function washing absorption column overhead；Desulfurization product
Lime stone slurry circulating slot is entered by pipeline, is excluded from lime stone slurry circulation trench bottom；Carbamide denitration product passes through pipeline
Into denitration demercuration serum recycle groove, discharge from denitration demercuration serum recycle trench bottom.
5. joint according to claim 4 removes SO in coal-fired flue-gas2/NOx/PM2.5The method of/Hg, it is characterised in that：Step
It is rapid 2) in, cold air addition for desulfurization saturated flue gas volume 10～20%, air temperature is lower than desulfurization saturated flue gas
More than 40 DEG C so that after desulfurization saturated flue gas mix with cold air flue gas degree of supersaturation S by S ≈ 1.00 increase to S=1.05～
1.20。
6. joint according to claim 4 removes SO in coal-fired flue-gas2/NOx/PM2.5The method of/Hg, it is characterised in that：Institute
State the de- liquid of denitration demercuration to be made up of carbamide, Oxygen in Liquid agent；The denitration demercuration absorbs liquid temp than the flue gas temperature into filler
Spend low more than 20 DEG C.
7. joint according to claim 6 removes SO in coal-fired flue-gas2/NOx/PM2.5The method of/Hg, it is characterised in that：Institute
State one or more combination that Oxygen in Liquid agent is following material：Ammonium persulfate., dimethyl sulfoxide, sodium hypochlorite, sodium chlorite,
Hydrogen peroxide, potassium hydrogen persulfate, ethylenediamine, triethanolamine, bleaching powder.
8. joint according to claim 4 removes SO in coal-fired flue-gas2/NOx/PM2.5The method of/Hg, it is characterised in that：Step
It is rapid 4) in, the PM of removing2.5Except the PM in original coal-fired flue-gas2.5Outward, also including the PM formed in desulfurization washing2.5, including SO3
Acid mist drop, inorganic salt microgranule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611131300.9A CN106582236A (en) | 2016-12-09 | 2016-12-09 | Method and device for combined removal of SO2/NOx/PM2.5/Hg in coal-fired smoke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611131300.9A CN106582236A (en) | 2016-12-09 | 2016-12-09 | Method and device for combined removal of SO2/NOx/PM2.5/Hg in coal-fired smoke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106582236A true CN106582236A (en) | 2017-04-26 |
Family
ID=58598625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611131300.9A Pending CN106582236A (en) | 2016-12-09 | 2016-12-09 | Method and device for combined removal of SO2/NOx/PM2.5/Hg in coal-fired smoke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106582236A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107638792A (en) * | 2017-09-26 | 2018-01-30 | 大连理工大学 | A kind of compound flue gas denitration oxidizing agent and application process |
| CN109045958A (en) * | 2018-08-03 | 2018-12-21 | 杭州电子科技大学 | The equipment for denitrifying flue gas and method of urea and dioxygen water mixed liquid combination SNCR |
| CN109260919A (en) * | 2018-09-10 | 2019-01-25 | 杭州电子科技大学 | The integration desulfurization denitration device and its desulfurization denitration method of ozone combination urea |
| CN109316941A (en) * | 2018-09-10 | 2019-02-12 | 杭州电子科技大学 | The equipment for denitrifying flue gas and its method of denitration of ozone combination urea combination SNCR |
| CN109589767A (en) * | 2018-12-17 | 2019-04-09 | 郑州大学 | The method and apparatus of pollutant integration removing in a kind of glass furnace fume |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101219333A (en) * | 2007-09-14 | 2008-07-16 | 东南大学 | Method and device for cooperation-removal of PM2,5 in flue gas wet desulphurization |
| CN101224367A (en) * | 2007-10-26 | 2008-07-23 | 东南大学 | Method of removing PM2.5 and gaseous pollutant using steam phase transition and device thereof |
| CN101732970A (en) * | 2010-01-20 | 2010-06-16 | 东南大学 | Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process |
| CN102553428A (en) * | 2012-01-10 | 2012-07-11 | 华北电力大学（保定） | Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method |
| CN203525547U (en) * | 2013-10-30 | 2014-04-09 | 上海龙净环保科技工程有限公司 | Wet-type integrated removal tower for desulfurization, denitration, demercuration, and PM2.5 removal |
| CN103721548A (en) * | 2014-01-17 | 2014-04-16 | 东南大学 | Desulfurization device and desulfurization method for promoting removal of PM2.5 in clean flue gas after wet desulphurization |
| CN103801178A (en) * | 2014-03-06 | 2014-05-21 | 汤宁 | Smoke purification device and method with integration of desulfuration, denitration, dust removal and mercury removal |
| CN104707432A (en) * | 2015-03-11 | 2015-06-17 | 高境 | System and method for synergistically removing dust and condensable particles in flue gas |
| CN105107340A (en) * | 2015-08-17 | 2015-12-02 | 南京师范大学 | Desulfurization, denitrification and demercuration integration apparatus based on amino absorber and method therefor |
| CN205055806U (en) * | 2015-09-30 | 2016-03-02 | 南京东大能源工程设计院有限公司 | Wet flue gas desulfurization denitration dust removal integration system |
-
2016
- 2016-12-09 CN CN201611131300.9A patent/CN106582236A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101219333A (en) * | 2007-09-14 | 2008-07-16 | 东南大学 | Method and device for cooperation-removal of PM2,5 in flue gas wet desulphurization |
| CN101224367A (en) * | 2007-10-26 | 2008-07-23 | 东南大学 | Method of removing PM2.5 and gaseous pollutant using steam phase transition and device thereof |
| CN101732970A (en) * | 2010-01-20 | 2010-06-16 | 东南大学 | Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process |
| CN102553428A (en) * | 2012-01-10 | 2012-07-11 | 华北电力大学（保定） | Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method |
| CN203525547U (en) * | 2013-10-30 | 2014-04-09 | 上海龙净环保科技工程有限公司 | Wet-type integrated removal tower for desulfurization, denitration, demercuration, and PM2.5 removal |
| CN103721548A (en) * | 2014-01-17 | 2014-04-16 | 东南大学 | Desulfurization device and desulfurization method for promoting removal of PM2.5 in clean flue gas after wet desulphurization |
| CN103801178A (en) * | 2014-03-06 | 2014-05-21 | 汤宁 | Smoke purification device and method with integration of desulfuration, denitration, dust removal and mercury removal |
| CN104707432A (en) * | 2015-03-11 | 2015-06-17 | 高境 | System and method for synergistically removing dust and condensable particles in flue gas |
| CN105107340A (en) * | 2015-08-17 | 2015-12-02 | 南京师范大学 | Desulfurization, denitrification and demercuration integration apparatus based on amino absorber and method therefor |
| CN205055806U (en) * | 2015-09-30 | 2016-03-02 | 南京东大能源工程设计院有限公司 | Wet flue gas desulfurization denitration dust removal integration system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107638792A (en) * | 2017-09-26 | 2018-01-30 | 大连理工大学 | A kind of compound flue gas denitration oxidizing agent and application process |
| CN107638792B (en) * | 2017-09-26 | 2019-12-27 | 大连理工大学 | Composite flue gas denitration oxidant and application method thereof |
| CN109045958A (en) * | 2018-08-03 | 2018-12-21 | 杭州电子科技大学 | The equipment for denitrifying flue gas and method of urea and dioxygen water mixed liquid combination SNCR |
| CN109260919A (en) * | 2018-09-10 | 2019-01-25 | 杭州电子科技大学 | The integration desulfurization denitration device and its desulfurization denitration method of ozone combination urea |
| CN109316941A (en) * | 2018-09-10 | 2019-02-12 | 杭州电子科技大学 | The equipment for denitrifying flue gas and its method of denitration of ozone combination urea combination SNCR |
| CN109589767A (en) * | 2018-12-17 | 2019-04-09 | 郑州大学 | The method and apparatus of pollutant integration removing in a kind of glass furnace fume |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102302849B1 (en) | Method for controlling aerosol production during absorption in ammonia desulfurization | |
| CN102512927B (en) | Integrated flue gas desulfurizing and denitrating purification system and purification technology for same | |
| CN106582236A (en) | Method and device for combined removal of SO2/NOx/PM2.5/Hg in coal-fired smoke | |
| CN106166434B (en) | A kind of ozone oxidation double tower ammonia process of desulfurization denitrating technique and its system | |
| CN102225303B (en) | Combined apparatus and method for dedusting, desulphurization, denitration, demercuration and smoke extraction of coal-fired flue gas | |
| CN109529549A (en) | Ultra-clean ammonia-process desulfurization technique is applied to the method for carbon capture process | |
| CN102658021A (en) | Advanced technology and device for integrating oxidation catalysis, desulfurization and denitrification | |
| CN1321723C (en) | Method of separating and recovering sulfur dioxide in smoke using ammonia method | |
| CN104524935A (en) | Single-tower type double-circulation sprinkling composite absorption device and method | |
| CN105727723A (en) | Three-cycle desulphurization method for wet type ammonia-process desulphurization and flue gas desulfurization tower or system | |
| CN205760545U (en) | Three circulating flue gas desulfurization tower or the systems for wet ammonia process desulfurizing | |
| CN105148698A (en) | Boiler flue gas desulfurization and denitrification system | |
| CN205760536U (en) | A kind of device of oxidizing process gas cleaning desulfurization denitration demercuration | |
| CN205796943U (en) | Ozone oxidation double tower ammonia process of desulfurization denitrating system | |
| CN103357260A (en) | Flue gas desulfurization-denitration integrated process for strengthening urea by applying ferrous complexing agent | |
| CN204247052U (en) | Single tower type double-cycle spray composite absorption device | |
| CN105032173A (en) | Device and process of ammonia-soda-process combined desulfurization and denitrification | |
| CN203916431U (en) | A kind of gaseous oxidation is in conjunction with the flue gas combined desulfurization and denitration device of wet absorption | |
| CN202683045U (en) | High-level oxidizing, catalyzing, desulfurizing and denitrating integral device | |
| CN105727712B (en) | A kind of flue gas desulfurization denitration dust-removing integrated equipment of coal-fired ceramic kiln | |
| CN205055777U (en) | Boiler flue gas desulfurization deNOx systems | |
| CN204619706U (en) | A kind of ozone oxidation coordinated desulfurization denitrating system | |
| CN106621663A (en) | Boiler flue gas treatment device and method | |
| CN105709595A (en) | System and method for synchronously performing low-temperature denitration and desulfuration on coke oven smoke | |
| CN205948624U (en) | Industry flue gas dry -type low temperature is in coordination with removing dust SOx/NOx control removal of mercury integrated device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170426 |
|
| RJ01 | Rejection of invention patent application after publication |