CN106955587A - A kind of minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas - Google Patents

A kind of minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas Download PDF

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CN106955587A
CN106955587A CN201710122122.1A CN201710122122A CN106955587A CN 106955587 A CN106955587 A CN 106955587A CN 201710122122 A CN201710122122 A CN 201710122122A CN 106955587 A CN106955587 A CN 106955587A
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flue gas
gas
coal
flue
dust
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孟磊
谷小兵
申镇
江澄宇
李叶红
李小海
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Datang Environment Industry Group Co Ltd
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Datang Environment Industry Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • 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
    • 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
    • B01D53/02—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 adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8665—Removing heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/40—Mixed oxides
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The present invention provides a kind of minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas.Comprise the following steps：1) flue gas is contacted with collaboration demercuration catalyst simultaneously in denitration first, and the nonvalent mercury in flue gas is converted into bivalent mercury；2) subsequently into phase transformation agglomeration device, 10 20 degree are reduced by media for heat exchange temperature, volume reduces, the increase of flue gas particle diameter, the increase of flue gas ratio resistance, flue gas after being reunited；3) dust arrester is subsequently entered, dust content is reduced to 30mg/Nm3, obtain one-time dedusting flue gas；4) desulfuration absorbing tower is finally entered, turbulence state is formed by turbulence device first；Then sulfide removed by spraying layer, be attached to and be dissolved in drop bivalent mercury and dust in flue gas；Secondary demisting is carried out again.So as to realize the collaboration processing and minimum discharge of heavy metal Hg, sulfur dioxide and dust.

Description

A kind of minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas
Technical field
The present invention relates to environmental protection technical field, more particularly to purifying coal-fired flue gas, and in particular to a kind of coal-fired flue-gas Multi-pollutant Collaborative Control minimum discharge processing method.
Background technology
The ministries and commissions of September three in 2014, which combine, to be issued《Coal electricity energy-saving and emission-reduction upgrading and transformation action plan》, action plan pair Thermal generation unit discharge standard proposes new requirement.Then, each province has formulated corresponding discharge according to own situation again and marked It is accurate.At present, coal fired thermal power plant carries out minimum discharge transformation and has become common recognition.
At present, the key for realizing minimum discharge is to realize the minimum discharge of sulfur dioxide and dust, in order to realize titanium dioxide Sulphur minimum discharge, although this method can improve desulfuration efficiency, is made, it is necessary to increase spraying layer or using string tower technology Valency is higher, and particularly with improvement project, enforcement difficulty is larger.In order to realize dust minimum discharge, prior art adds wet Formula electrostatic precipitation technology, the technological system is complicated, and operating cost is higher.
In coal-fired flue-gas processing equipment, existing desulfurization and dedusting technology collaboration efficiency of dust collection is low, generally in 50-70%, because This requires higher, it is necessary to increase at extras or measure progress dedusting to dust concentration in desulfuration absorbing tower inlet flue gas Reason, otherwise, once the dust concentration in inlet flue gas is more than 30mg/Nm3, dust outlet concentration just do not reach 5mg/Nm3Following It is required that, do not meet discharge standard.
In addition, the pollution of coal-fired flue-gas heavy metal Hg also has become the another great society focus of attention., Chinese environmental in 2011 The new edition that protection portion is promulgated《Fossil-fuel power plant atmospheric pollutant emission standard》Regulation, performed coal-fired plant flue gas mercury since 2015 The μ g/m of emission limit 303Standard.
Utilize existing pollutant catabolic gene device demercuration, i.e. selective catalytic reduction denitration device (SCR), electric cleaner/cloth Bag dust collector (ESP/FF) and wet desulphurization device (WFGD) etc. are to each form mercury (elementary gas state mercury Hg0 (g), gas in flue gas State oxidation state mercury Hg2+(g), particle mercury Hg (p)) realize different degrees of conversion, enrichment and remove；Usual coal-burning power plant's pollution Thing control device is 40% to the cooperation-removal efficiency of mercury.
Using flue gas injection adsorbent demercuration, special demercuration adsorbent (activated carbon is set between air preheater and deduster Deng) flue gas injection device, adsorbent can remove mercury in flue gas steam by efficient absorption within 2 second residence time, or be catalyzed Readily removed oxidation state mercury is oxidized to, the adsorbent after demercuration is finally trapped by deduster.Flue gas injection demercuration is current combustion Coal-fired plant's most practical demercuration technology, efficiency can meet the mercury emissions standard in the U.S., but make using activated carbon up to more than 90% During for adsorbent, its high cost often removes 1 pound of gas mercury (0.45kg) up to 2.5~6.0 ten thousand dollars.So high operating cost exists China probably is difficult to promote.
Therefore, the art is needed badly improves for existing coal-fired flue-gas handling process, it is possessed collaboration processing function, And make every effort to reduce processing cost to a certain extent.
The content of the invention
Regarding to the issue above, the present invention provides a kind of minimum discharge processing side of the multi-pollutant Collaborative Control of coal-fired flue-gas Method.Boiler smoke initially enter with collaboration demercuration function SCR denitration reactor realize denitration, then by agglomeration device after Pass through deduster again, desulphurization and dust removal integrated device is finally entered, so as to realize the collaboration of heavy metal Hg, sulfur dioxide and dust Processing and minimum discharge.
For up to above-mentioned purpose, the concrete technical scheme that the present invention takes is：
A kind of minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas, comprises the following steps：
1) flue gas enters Benitration reactor, is contacted simultaneously with collaboration demercuration catalyst in denitration, by the nonvalent mercury in flue gas Bivalent mercury is converted into, flue gas after being catalyzed；
2) flue gas enters phase transformation agglomeration device after being catalyzed, and 10-20 degree is reduced by media for heat exchange temperature, and volume reduces, cigarette Gas particle diameter increases, the increase of flue gas ratio resistance, flue gas after being reunited；
3) flue gas enters dust arrester after reuniting, and dust content is reduced into 30mg/Nm3, obtain one-time dedusting flue gas；
4) one-time dedusting flue gas enters desulfuration absorbing tower, forms turbulence state by turbulence device first；Then spray is passed through Drenching layer removing sulfide, it is attached to and is dissolved in drop bivalent mercury and dust in flue gas；Secondary demisting is carried out again, passes through ridge respectively Formula demister and spiral-flow type electrostatic precipitator demisting, wherein system loading is judged according to exhaust gas volumn, during high load capacity, spiral-flow type electricity demisting Device demisting no power, passes through cyclone mode demisting；During underload, spiral-flow type electrostatic precipitator demisting is powered, and is coordinated by electric demisting Cyclone mode demisting.
Further, the phase transformation agglomeration device is circulated using teflon heat exchanger for heat transferring medium；The heat transferring medium For water.
Further, the dust arrester is electric cleaner.
Further, the collaboration demercuration catalyst is selected from the SiO of addition Ce elements and Zr elements2-TiO2-V2O5Catalysis Agent or bromide catalysts.
Further, step 1) afterwards be catalyzed after flue gas contact by the demercuration adsorbent with injection after enter back into phase transformation reunite Device.
Further, the turbulence device includes：If being sequentially arranged dried layer pipe row along flue gas flow, each Guan Liezhong includes many The turbulent pipe of root parallel arrangement, any Guan Liezhong each turbulent pipe is parallel with other Guan Liezhong turbulent pipe to interlock or projection friendship Fork；The percent opening that the pipe is listed in the horizontal cross-section of its place tower body is 65%-78%.
By taking above-mentioned technical proposal, flue gas enters phase transformation agglomeration device, and temperature reduces 10-20 degree after heat exchange, Flue gas volume reduces, and flue gas particle diameter becomes greatly under agglomeration, the increase of flue gas ratio resistance, due to subsequently using electric cleaner, than Resistance reduction can improve Electric Scrubber Efficiency.Grain diameter increases, and can improve deduster and desulfuration absorbing tower to tiny The arresting efficiency of particle.And turbulence device and secondary Defrosting structure, efficiency of dust collection can be further improved, desulfurization process is realized During, realize collaboration dedusting, it is ensured that sulfur dioxide reaches minimum discharge standard, and desulfuration efficiency can reach 99.95%, And collaboration efficiency of dust collection is high, can be that dust content is reduced to ＜ 5mg/Nm3；Be tod in Benitration reactor using mercury catalyst Nonvalent mercury is oxidized to bivalent mercury so as to the cooperation-removal in desulfuration absorbing tower, and after being handled through reunion, bivalent mercury is also more easy to The cooperation-removal in dust arrester and desulfuration absorbing tower, demercuration efficiency reaches 84.2-93.1%.Also, need not be higher using consuming Wet scrubber, operating cost is relatively low, and energy-saving effect is notable.
And have the advantages that operating cost is low, to reach same dust removing effects, traditional handicraft need to increase extra cigarette Cleaner before gas entrance, in contrast, the present invention can make related operating cost reduction about 40%.Reach same demercuration Effect, preferable technique is that in contrast, the present invention can be by the reduction of related operating cost about as adsorbent using activated carbon 65%.
Brief description of the drawings
Fig. 1 is the arrangement schematic diagram of smoke processing system in one embodiment of the invention.
Fig. 2 is the structural representation of phase transformation agglomeration device in one embodiment of the invention.
Fig. 3 is grain diameter in the flue gas before and after reuniting in one embodiment of the invention through the phase transformation agglomeration device shown in Fig. 2 Distribution schematic diagram.
Fig. 4 is the structural representation of desulfuration absorbing tower in one embodiment of the invention.
Fig. 5 is the structural representation of secondary demisting unit in one embodiment of the invention.
Fig. 6 is the schematic flow sheet of the minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Whole description.
As shown in fig. 6, in one embodiment there is provided a kind of minimum discharge of the multi-pollutant Collaborative Control of coal-fired flue-gas at Reason method, comprises the following steps：
1) flue gas enters Benitration reactor, is contacted simultaneously with collaboration demercuration catalyst in denitration, by the nonvalent mercury in flue gas Bivalent mercury is converted into, flue gas after being catalyzed；
2) flue gas enters phase transformation agglomeration device after being catalyzed, and 10-20 degree is reduced by media for heat exchange temperature, and volume reduces, cigarette Gas particle diameter increases, the increase of flue gas ratio resistance, flue gas after being reunited；
3) flue gas enters dust arrester after reuniting, and dust content is reduced into 30mg/Nm3, obtain one-time dedusting flue gas；
4) one-time dedusting flue gas enters desulfuration absorbing tower, forms turbulence state by turbulence device first；Then spray is passed through Drenching layer removing sulfide, it is attached to and is dissolved in drop bivalent mercury and dust in flue gas；Secondary demisting is carried out again, passes through ridge respectively Formula demister and spiral-flow type electrostatic precipitator demisting, wherein system loading is judged according to exhaust gas volumn, during high load capacity, spiral-flow type electricity demisting Device demisting no power, passes through cyclone mode demisting；During underload, spiral-flow type electrostatic precipitator demisting is powered, and is coordinated by electric demisting Cyclone mode demisting.
As shown in figure 1, to realize that above-described embodiment describes the flue gas after-treatment system of method, including along flue gas flow direction successively Connection：Boiler 1, SCR denitration reactor 2, air preheater 3, phase transformation agglomeration device 4, dust arrester 5, desulfuration absorbing tower 6 and chimney 7；
Wherein, Benitration reactor 2 is SCR denitration reactor, inside it on the basis of conventional denitrating catalyst is set, is increased Provided with collaboration demercuration catalyst layer 21.Collaboration demercuration catalyst layer 21 is disposed with catalyst, catalyst be selected from addition Ce elements and The SiO of Zr elements2-TiO2-V2O5Catalyst or bromide catalysts.Mercury In Coal Combustion Flue Gas is broadly divided into three kinds of forms, Yi Zhongwei Nonvalent mercury, particulate Hg, and bivalent mercury.The water insoluble more difficult removing of nonvalent mercury.Particulate Hg can cooperate with de- when by deduster Remove.Bivalent mercury is dissolved in water, and major part can be removed in wet desulfuration tower.The present embodiment to demercuration catalyst by changing Property, mercury oxidation performance is improved, nonvalent mercury is oxidized to bivalent mercury so as to which in wet desulphurization device cooperation-removal, the modification of use is urged Agent, it is possible to increase catalyst mercury oxidation performance.Modified catalysts mercury oxidation ability improves 30-40%, overall demercuration efficiency More than 80% is reached, current standard requirement can be met.
In a further embodiment, the device of an injection mercury absorbent is increased between air preheater and deduster, effect is most Good is activated carbon, but cost is higher, high or for the high running environment of emission request in some mercury in flue gas contents Under, it is contemplated that it is synchronous to use above-mentioned setting.
As shown in Fig. 2 phase transformation agglomeration device 4 includes：Entrance rectification section 41, phase inversion hot arc 42 and the outlet being sequentially connected Section 43；Heat exchanger is disposed with phase inversion hot arc 42, is led to for heat exchanging medium flow；Connect the medium inlet 44 at heat exchanger two ends And media outlet 45.Entrance rectification section 41 is provided with some deflectors, to make the flue gas flow field by entrance rectification section 41 equal It is even；Heat exchanger in phase inversion hot arc 42 is teflon heat exchanger；Heat transferring medium is water.Certainly, in some other embodiment, Heat transferring medium also can be replaced other, such as liquid paraffin.
As shown in figure 4, desulfuration absorbing tower 6, including：As the tower body 61 of flue gas path, with smoke inlet 62 and flue gas Outlet 67；In tower body 61, it has been sequentially arranged along flue gas flow direction：Turbulence device 63, to make flue gas form turbulent flow after State；Spraying layer 64；First demisting layer 65；Second demisting layer 66；
Wherein, if the first demisting layer 65 is disposed with dried layer ridge type demister, the second demisting layer 66 is disposed with spiral-flow type electricity Demister；Spiral-flow type electrostatic precipitator includes multiple secondary demisting units, as shown in figure 5, each secondary demisting unit includes anode Cylinder 661, anodal barrel 661 has a gas approach, and the gas approach is provided with spiral board 662；The center of anodal barrel 661 is consolidated If the pole piece 663 being insulated from, pole piece 663 electrically connects a high-voltage DC power supply (not shown).High-voltage DC power supply connection one is controlled Device processed, for example, automatic switch, the control device access a control system, for example, desulphurization system dcs (DCS).It can be realized by DCS and automatically controlling for power on/off is carried out according to system loading.
Dust arrester 5 is electric cleaner.
Turbulence device 63 includes：If being sequentially arranged dried layer pipe row along flue gas flow, each Guan Liezhong includes many parallel arrangements Turbulent pipe, any Guan Liezhong each turbulent pipe is parallel with other Guan Liezhong turbulent pipe staggeredly or projection intersects.The pipe row Percent opening where it in horizontal cross-section of tower body is 65%-78%.The turbulent pipe is circular or similar round.Concrete structure Refer to the related series of patents (patent No. that applicant has obtained mandate：ZL 201420330458.9 etc.), no longer go to live in the household of one's in-laws on getting married herein State.
Compared with disclosed patent before applicant, the percent opening that pipe is listed in the horizontal cross-section of its place tower body is 65%-78%, according to this percent opening, obtains preferably collaboration dedusting and demercuration effect.
In addition, the distance between turbulence device and spraying layer are 1.8-3.2 meters.
The flue gas discharged after boiler initially enters SCR denitration reactor, by phase transformation agglomeration device, is filled subsequently into dedusting Put, dust arrester exports dust Control in 30mg/Nm3, wet desulphurization device i.e. desulfuration absorbing tower is finally entered, rapids is sequentially passed through Device, spraying layer and high-efficiency demisting apparatus are flowed, is then discharged by chimney.
During flow of flue gas, phase transformation agglomeration device mainly by suitably reducing flue-gas temperature, makes Drop Condensation in flue gas, Drop is attached to fine dust particles surface, so as to realize that dust granules are reunited, increases big dust particle proportion, such as Fig. 3 Shown, particle size distribution changes in the flue gas before and after reuniting through reunion room.In figure abscissa be grain diameter, unit for μm, Ordinate is the percentage shared by corresponding particles, and the particle before reunion is mainly curve after less than 1 μm of little particle, reunion Crest moves right, and more than 1 μm of particle accounts for the 96% of sum, shows particle growth effect significantly, after bulky grain is more conducive to Continuous electric cleaner removing.Phase transformation can also reduce flue gas ratio resistance while reunion, so as to improve dust collector efficiency and desulfurizing tower association Same efficiency of dust collection.
Processing as described in above-mentioned embodiment is provided, and being used in SCR denitration reactor has collaboration demercuration catalyst, uses So that the nonvalent mercury in flue gas is converted into bivalent mercury, to improve wet desulfurization system to mercuric detersive efficiency, ensureing nitrogen While oxide realizes minimum discharge, mercury oxidation rate is improved, so as to improve follow-up equipment mercury removal ability.It is final to realize Demercuration efficiency reaches 82.2-90.1%.Meanwhile, the setting of turbulence device and secondary demisting can ensure sulfur dioxide removal efficiency More than 99.95%, dust removal efficiency more than 83%.Electric cleaner is mainly tentatively removed to dust in flue gas, it is ensured that powder Dust concentration drops to 30mg/Nm3Within, basis can be provided for follow-up equipment cooperation-removal dust.
And turbulence device is added in desulfuration absorbing tower, it is possible to achieve flue gas even distribution and increase gas-liquid contact time, so that Significantly improve desulfurizing tower desulfuration efficiency and collaboration dedusting demercuration effect.Spiral-flow type electric demister can improve collaboration dedusting demercuration Performance.Spiral-flow type demister be divided into above and below two regions, flue gas from bottom to top, at smoke inlet set a spiral-flow type demisting Device, top is wet type electrostatic precipitator.High load capacity or underload, usual cigarette are mainly determined by exhaust gas volumn or boiler capacity Tolerance or boiler capacity think underload specified 70% with worthwhile high load capacity, less than 70%.In the case where load is high, The spiral-plate leaf guiding high velocity smoke tangential swirl of anodal barrel bottom, the centrifugal force that flue gas eddy flow is produced is by droplet and flue dust Anodal barrel inner surface is thrown to, the liquid film on anodal barrel surface captures these droplets, and the dust droplet of capture is fallen into liquid film Lower absorbent tower reaches the effect gathered dust.When boiler load is low, when the spiral flow at inlet device can not reach optimal efficiency of dust collection, with Automatic control mode opens DC high-voltage power supply, can also realize electric power starting and closure by manually operating.Flue gas is through eddy flow Plate enters after anodal barrel, charged band anion in the particulate matter and water droplet in flue gas, these particulate matters and mist with anion Drop is attracted on the dust collector pole of positively charged, after droplet, particle are attracted to dust collector pole, is washed by water by spraying, it is dropped To the desulfurizing tower of lower section, so as to reach ＜ 5mg/Nm3Dust collection effect.The device overcome individually using spiral-flow type demister and Individually using the shortcoming of wet type electrostatic precipitator, have the advantages that operating cost is low, load adaptability is good.And as drop is removed The raising of rate, wherein the bivalent mercury adhered to also being removed with higher efficiency so that obtain collaboration demercuration effect.
Practical engineering application shows that the setting of turbulence device and secondary demisting can ensure sulfur dioxide removal efficiency More than 99.95%, dust removal efficiency more than 83%.
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.

Claims (6)

1. a kind of minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas, comprises the following steps：
1) flue gas enters Benitration reactor, is contacted simultaneously with collaboration demercuration catalyst in denitration, the nonvalent mercury in flue gas is converted For bivalent mercury, flue gas after being catalyzed；
2) flue gas enters phase transformation agglomeration device after being catalyzed, and 10-20 degree is reduced by media for heat exchange temperature, and volume reduces, flue gas grain Footpath increases, the increase of flue gas ratio resistance, flue gas after being reunited；
3) flue gas enters dust arrester after reuniting, and dust content is reduced into 30mg/Nm3Hereinafter, one-time dedusting flue gas is obtained；
4) one-time dedusting flue gas enters desulfuration absorbing tower, forms turbulence state by turbulence device first；Then spraying layer is passed through Removing sulfide, it is attached to and is dissolved in drop bivalent mercury and dust in flue gas；Secondary demisting is carried out again, is removed respectively by ridge type Day with fog and spiral-flow type electrostatic precipitator demisting, wherein judging system loading according to exhaust gas volumn, during high load capacity, spiral-flow type electrostatic precipitator is removed Mist no power, passes through cyclone mode demisting；During underload, spiral-flow type electrostatic precipitator demisting is powered, and coordinates eddy flow by electric demisting Mode demisting.
2. the minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas as claimed in claim 1, its feature exists In the phase transformation agglomeration device is circulated using teflon heat exchanger for heat transferring medium；The heat transferring medium is water.
3. the minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas as claimed in claim 1, its feature exists In the dust arrester is electric cleaner.
4. the minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas as claimed in claim 1, its feature exists In the collaboration demercuration catalyst is selected from the SiO of addition Ce elements and Zr elements2-TiO2-V2O5Catalyst or bromide catalysis Agent.
5. the minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas as claimed in claim 1, its feature exists In step 1) afterwards be catalyzed after flue gas contacted by the demercuration adsorbent with injection after enter back into phase transformation agglomeration device.
6. the minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas as claimed in claim 1, its feature exists In the turbulence device includes：If being sequentially arranged dried layer pipe row along flue gas flow, each Guan Liezhong includes the rapids of many parallel arrangements Flow tube, any Guan Liezhong each turbulent pipe is parallel with other Guan Liezhong turbulent pipe staggeredly or projection intersects；The pipe is listed in it Percent opening in the horizontal cross-section of place tower body is 65%-78%.
CN201710122122.1A 2017-03-03 2017-03-03 A kind of minimum discharge processing method of the multi-pollutant Collaborative Control of coal-fired flue-gas Pending CN106955587A (en)

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CN102794102A (en) * 2012-08-20 2012-11-28 安徽工业大学 Desulfurization tower equipped with gas-flow uniform-distribution plate
CN103994456A (en) * 2014-05-06 2014-08-20 浙江天地环保工程有限公司 Integrated system for efficiently and synergistically removing multiple pollutants

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102794102A (en) * 2012-08-20 2012-11-28 安徽工业大学 Desulfurization tower equipped with gas-flow uniform-distribution plate
CN103994456A (en) * 2014-05-06 2014-08-20 浙江天地环保工程有限公司 Integrated system for efficiently and synergistically removing multiple pollutants

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Application publication date: 20170718