CN102225303B - Combined apparatus and method for dedusting, desulphurization, denitration, demercuration and smoke extraction of coal-fired flue gas - Google Patents

Combined apparatus and method for dedusting, desulphurization, denitration, demercuration and smoke extraction of coal-fired flue gas Download PDF

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CN102225303B
CN102225303B CN201110103373.8A CN201110103373A CN102225303B CN 102225303 B CN102225303 B CN 102225303B CN 201110103373 A CN201110103373 A CN 201110103373A CN 102225303 B CN102225303 B CN 102225303B
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tower
flue gas
grid
chimney
moisture film
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CN102225303A (en
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张蕊
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张蕊
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Abstract

The invention discloses a combined apparatus for dedusting, desulphurization, denitration, demercuration and smoke extraction of coal-fired flue gas, which mainly comprises a rod lattice water film tower (1) with a rod lattice layer (7) located interiorly, an electro-catalytic oxidation device (3), an oxidation tower (4), a chimney (6) with a rod lattice layer ( 7) located interiorly, and a spray liquid circulation system attached to the rod lattice water film tower (1) and the chimney (6); the rod lattice water film tower (1) is connected to the electro-catalytic oxidation device (3) and the oxidation tower (4) orderly; a flue gas outlet of the oxidation tower (4) is connected to a flue gas inlet of the chimney (6) through an induced draft fan (5); a water distributing device or a spray device disposed above the rod lattice layer (7) is communicated with the spray liquid circulation system. The combined apparatus has small occupation area, low operation cost, and high removing efficiency for pollutants in flue gas, and realizes integrated control of dedusting, desulphurization, denitration, and demercuration of flue gas.

Description

The combined unit of a kind of coal-fired flue-gas dust-removing, desulphurization and denitration, demercuration and smoke evacuation and method

Technical field

The application relates to a kind of purifying processing device and purification method of flue gas, particularly relates to a kind of combined unit and the method thereof of coal-fired flue-gas dust-removing, desulphurization and denitration, demercuration and smoke evacuation.

Background technology

Flue gas, particularly coal-fired flue-gas, contain a large amount of flue dust, sulfide, itrated compound and heavy metal (particularly mercury).Flue gas, as inadequate without purified treatment or degree for the treatment of, easily forms the pollutions such as floating dust, acid rain and heavy metal, serious environment pollution.In every profession and trade, power industry is the rich and influential family of China's Air Pollutant Emission, particularly China to take the thermal power generation proportion that the fossil fuels such as fire coal are raw material larger, the discharge of the flue dust of its discharge, sulfur dioxide, nitrogen oxide, mercury and/or carbon dioxide all occupies national every profession and trade prostatitis.Therefore the pollutant emission standard that country promulgates each period first for be power industry.

At present, the International or National emission request for pollutant is more and more stricter.Before 1980, < < Industrial " three Waste " discharge tentative standard > > (GBJ 4-1973) regulation that thermal power plant carries out, smoke discharge amount is by chimney height restriction, and utilizing high chimney emission countermeasure efficiency of dust collection is 80%~90% can be up to standard.< < Emission standards of air pollutants for coal-fired > > (GB 13223-1991) regulation of 1991, as long as dust concentration reaches 2000mg/Nm 3, even need only≤3300mg/Nm 3can be up to standard.The < < fossil-fuel power plant atmospheric pollutant emission standard > > (GB 13223-1996) of 1996 has improved discharge standard, and dust exhausting concentration limit value is brought up to 200~600mg/Nm 3.The < < fossil-fuel power plant atmospheric pollutant emission standard > > (GB 13223-2003) of 2003 has further improved discharge standard, and it stipulates newly-built fired power generating unit dust exhausting concentration execution 50mg/Nm 3standard, sulfur dioxide emissioning concentration is carried out 400mg/Nm 3.After this regulation is put into effect, the whole nation starts to start on a large scale desulfurization facility.

Except national standard, provincial standard is launched respectively in each province and city, the discharge of pollutant in strict restriction flue gas, such as the provincial standard DB11/139-2002 < < of Beijing boiler pollutant comprehensive discharge standard > > regulation, new construction of coal-fired boiler dust exhausting concentration is carried out 30mg/Nm 3standard, sulfur dioxide emissioning concentration is carried out 50mg/Nm 3standard.The restriction of provincial standard to pollutant in flue gas, be far away higher than the national standard of the same period.

In addition, national standard also has the further strict trend that limits pollutant emission in flue gas.Bis-exposure drafts of < < fossil-fuel power plant atmospheric pollutant emission standard > > of new revision send, and first meeting in 2011 is promulgated and carried out.According to the regulation of this suggestion original text, it has further strictly limited the discharge of each pollutant component, and the newly-increased restriction to discharged nitrous oxides.Meanwhile, in " 12 " planning, also clear and definite nitrogen oxide overall control will be carried out in China.Since then, there is no equipment for denitrifying flue gas, be discharged to the restriction that the nitrogen oxides in effluent of atmosphere can exceed national standard, the carrying out that impact is produced.Therefore in existing flue-gas purification equipment, increase purification of nitrogen oxides device, become industry inexorable trend.

Although the content of mercury is only within the scope of 0.012~33mg/L, due to a large amount of burnings of coal, more than the mercury total amount of overflowing every year in the whole world from fire coal reaches 3000t in raw coal.U.S. EPA estimation, the mercury of US Coal-fired Power Plants boiler emission in 1999 is about 75t, and wherein about 48t has entered in atmosphere.A large amount of mercury, by dry deposition or wet deposition polluted-water, forms hypertoxic methyl mercury (MeHg) after biological respinse, in fish and other biological body, after enrichment, can circulate and enter human body again, and the mankind are caused to great harm.U.S. scientific institution research finds, takes in and is subject to the fish of Methylmercury pollution Riverfish and seafood can cause nerve to a certain degree and the harm of development.In December, 2000, U.S. EPA announces to start to control the discharge of coal-fired plant boiler mercury in flue gas.

China has also strengthened the restriction to mercury in flue gas discharge gradually.On May 11st, 2010, the General Office of the State Council issues < < about advancing the work of atmosphere pollution groupcontrol to improve the instruction > > of region air quality, wherein has the content of " building the multi-pollutant Collaborative Control show-how engineerings such as fired power generating unit flue gas desulfurization, denitration, dedusting and the removal of mercury ".Can expect, national standard will made strict restriction to the discharge of mercury in flue gas in the near future.

Therefore, the enterprise of existing generation coal-fired flue-gas, particularly coal-burning power plant, must realize coal-fired flue-gas dust-removing, desulphurization and denitration, demercuration and smoke evacuation operation.During existing purifying coal-fired flue gas is processed, be all to adopt separate unit to realize respectively dedusting, desulphurization and denitration, demercuration and smoke evacuation operation.Wherein:

The technique of dedusting mainly contains dry dust removal and wet dust removal technique.The main of dry dust removal represents that technique is filtering technique or electrostatic precipitation technique.

In filtering technique, the most typical with sack cleaner, bag-type dusting utilizes filter bag Chalk-dust filtering.Sack cleaner is a kind of dry type dust filtration device, and it is applicable to trap tiny, dry, non-fiber dust.Filter bag adopts the filter cloth of weaving or nonwoven felt to become, utilize the filtration of fabric to filter dusty gas, when dusty gas enters sack cleaner, large, the heavy dust of particle, because the effect of gravity settles down, fall into ash bucket, contain compared with the gas of fine dusts when by filtrate, dust, by detention, is purified gas.But along with dust is the gathering of filter material surface, can make the resistance of deduster too high, cause the air quantity of dust pelletizing system significantly to decline.Therefore, the resistance of deduster reaches after certain numerical value, timely deashing, can not destroy bonding layer during deashing simultaneously, otherwise efficiency of dust collection can decline, and this just causes dust removal operation not carry out continuously.

The operation principle of electrostatic precipitation is to utilize high voltage electric field that flue gas is ionized, dust in air-flow charged under electric field action with flow separation.The negative pole of electrostatic precipitator is made by the plain conductor of different section shape, is sparking electrode, and positive pole is made by the metallic plate of different geometries, is collecting electrode.The performance of electrostatic precipitator is subject to the impact of three factors such as dust characteristic, equipment structure and flue gas flow rate.The ratio resistance of dust is the index of evaluating electric conductivity, and it has direct impact to efficiency of dust collection.More too low than resistance, grit is difficult to remain on collecting electrode, cause it to return to air-flow, compare too high in resistance, the grit electric charge that arrives collecting electrode is difficult for emitting, between knoisphere, form voltage gradient and can produce partial breakdown and electric discharge phenomena, these situations all can cause efficiency of dust collection to decline, so electrostatic precipitator is stricter to equipment requirement.

Wet dust removal is commonly called as " water dedusting ", and it is to make dusty gas and liquid (water) close contact, utilizes the inertial collision of water droplet and particle and the device that other effects trap particle or particle is increased.According to the purification mechanism of wet scrubber, it roughly can be divided into seven classes: (1) gravity spray washer, (2) cyclone scrubber, (3) self-excitation spray jet scrubber, (4) plate type washing device, (5) padding washing device, (6) Venturi scrubber, (7) mechanical induction spray jet scrubber.In existing technique, for saving space, reducing the considerations such as cost, wet dust removal is many and desulfurization unit is integrated.

Flue gas desulfurization (Flue gas desulfurization is called for short FGD), in FGD technology, divides by the kind of desulfurizing agent, can be divided into following Lung biopsy: with CaCO 3(lime stone) is basic calcium method, take MgO as basic magnesium method, with Na 2sO 3for basic sodium method, with NH 3for basic ammonia process, take organic base as basic organic alkaline process.The commercialization technology of generally using is in the world calcium method, and proportion is more than 90%.

By absorbent and desulfurization product, the dry and wet state in sweetening process can be divided into again wet method, dry method and half-dried (half is wet) method to desulfur technology.

Wet FGD technology is mainly to use lime stone (CaCO 3), lime (CaO) or sodium carbonate (Na 2cO 3) etc. slurries make washing agent, in reaction tower, flue gas is washed, thereby removes the oxysulfide in flue gas.The wet FGD technique history of existing 50 years, through after Improvement and perfection constantly, technology comparative maturity, and there is desulfuration efficiency high (90%~98%), unit capacity is large, and coal adaptability is strong, and the lower and byproduct of operating cost is the advantage such as recovery easily.According to the statistics of EPA (EPA), the whole America thermal power plant adopts in wet desulfurizer, and wet type lime method accounts for 39.6%, and limestone-based process accounts for 47.4%, two method and accounts for altogether 87%; Two alkaline process account for 4.1%, and sodium carbonate method accounts for 3.1%.Countries in the world (as German, Japanese etc.), in large thermal power plant, more than 90% adopt wet type lime/lime stone-gypsum method flue gas desulfurization technique flow process.Although this method has, desulphurization reaction speed is fast, equipment is simple, desulfuration efficiency advantages of higher, and ubiquity seriously corroded, operation and maintenance cost is high and easily cause secondary pollution problems.

The desulfurization absorption of dry method FGD technology and product are processed and all under dry state, are carried out, this method have without sewage spent acid discharge, equipment corrosion degree is lighter, flue gas in purification process without significant hypothermal, purify after cigarette temperature high, be beneficial to the advantages such as chimney exhaust diffusion, secondary pollution are few, but exist desulfuration efficiency low, the problem such as reaction speed is slow, equipment is huge.

Semidry method FGD technology refers to desulfurizing agent desulfurization under drying regime, regeneration under wet condition (as washing regenerating active carbon flow process), or desulfurization under wet condition, under dry state, processes the flue gas desulfurization technique of desulfurization product (as spray drying process).Particularly desulfurization under wet condition, under dry state, process the semidry method of desulfurization product, with its advantage that existing wet desulphurization reaction speed is fast, desulfuration efficiency is high, have again dry method without sewage spent acid discharge, the easy-to-handle advantage of desulfurization afterproduct and be subject to people and pay close attention to widely.

In desulfurization process, be only acid nitrogen oxide and be removed, NO, N 2the non-acid gases such as O are still present in flue gas, and nitrogen oxide in flue gas more than 90% the form with NO exist, therefore must the nitrogen oxide in flue gas be further processed.Because NO is insoluble in water, therefore to the processing of NO, can not use simple washing method.The main technique of denitrating flue gas has: oxidizing process, O 3oxidation absorption process, ClO 2oxidation-reduction method, selective catalytic reduction and SNCR method.

The principle of flue gas oxidizing process denitration is, with oxidant, NO is oxidized to NO 2, the NO of generation 2water or alkaline solution absorb again, thereby realize denitration.

O 3oxidation absorption process O 3nO is oxidized to NO 2, then water absorbs, the product HNO of this method 3liquid need be through concentration, and O 3need high voltage to produce, invest and operating cost is high.

ClO 2oxidation-reduction method is to use ClO 2nO is oxidized to NO 2, then use Na 2sO 3the aqueous solution is by NO 2be reduced into N 2, this method can be combined with the Wet Flue Gas Desulfurization Technique that adopts NaOH as desulfurizing agent, the product Na of desulfurization 2sO 3can be used as again NO 2reducing agent.ClO 2the denitration rate of method can reach 95%, and desulfurization simultaneously, but ClO 3higher with the price of NaOH, operating cost increases.

SNCR method (SNCR) is not used catalyst, uses reducing agent (NH in 850~1100 ℃ of temperature ranges 3, urea) and by NO xbe reduced to N 2.

Selective catalytic reduction (SCR) is the most ripe current denitration method for flue gas, and it utilizes reducing agent (NH 3, urea) under metallic catalyst effect, within the scope of 400~800 ℃ optionally with NO xreaction generates N 2and H 2o.

General three kinds of forms, the atomic state mercury (Hg of existing of mercury in flue gas 0), gaseous mercury (Hg 2+) and particle mercury.In combustion process, the volatilization of will being heated of the mercury in coal is present in flue gas with the form of mercury vapour, mainly comprises Elemental Mercury Hg 0with divalence mercury Hg 2+two kinds, Elemental Mercury (Hg 0) be the heating power stable form of mercury, the compound of most of mercury temperature during higher than 800 ℃ in thermally labile state, they will decomposes become Elemental Mercury, therefore, under furnace high-temperature (about 1200 ℃-1500 ℃), mercury in coal is nearly all transformed into Elemental Mercury, and stays in flue gas with gaseous form.

Elemental Mercury is the main existence form of mercury in atmosphere, its volatility is higher, water-soluble lower, mean residence time in atmosphere reaches half a year to two year, and very easily in atmosphere, logical long-distance atmosphere transportation forms mercury pollution widely, is one of form the most rambunctious; And divalence mercury compound is more stable, numerous species is more soluble in water, easily by wet scrubbing system, caught and remove, and in wet method fume desulfurizing system (WFGD), no matter be to adopt lime or lime stone as absorbent, all can remove approximately 90% Hg 2+so mercuric content is lower in atmosphere; And particle mercury can filtering in the lump when the filtrating smoke dust.Therefore the problem that removes that, has solved Elemental Mercury has also just solved the mercury pollution problem of coal-fired flue-gas.

Flue gas demercuration mainly contains following several method: adsorbent method, chemical precipitation method and chemical oxidization method.

Absorption method is mainly to utilize the suction-operated of porous solid material to process a kind of common method of pollutant.Comprise two kinds of modes of physical absorption and chemisorbed, physical absorption is the absorption producing due to intermolecular interaction, and not selective, adsorption strength is good, has invertibity, is exothermic process; Chemisorbed is the absorption that interacts and produce by chemical bonding force, and this adsorptive selectivity is good, absorption affinity strong, have irreversibility, is endothermic process.General absorption all has physical absorption, chemisorbed function concurrently, and two kinds of adsorption processes can be carried out simultaneously.At present, the adsorbent for flue gas demercuration mainly contains: active carbon, flying dust and metal absorbent.

Chemical precipitation method is to generate precipitation by chemical reagent and mercury generation chemical reaction, thereby mercury is removed, at present, apply many methods and mainly contain following several [4]: (1) liquor kalii iodide washing method: mercury fume enters demercuration tower, contact with liquor kalii iodide in tower, mercury oxidized with circulation solution in iodine react and generate iodine mercury complex, thereby the mercury in flue gas is removed.The method can reach 97% demercuration rate.(2) the chloridising removal of mercury: the exploitation of the method Shi You Norway company, flue gas enters demercuration tower, at the HgCl of Ta Nei and spray 2solution countercurrent washing, the mercuryvapour in flue gas is by HgCl 2solution oxide (under 30-40 ℃ of condition) generates Hg 2cl 2precipitation, thereby by Hg 0remove.Reaction equation is as follows: HgCl 2+ Hg → Hg 2cl 2↓, conventionally, by a part of Hg generating 2cl 2precipitation Cl 2oxidation, makes Hg 2cl 2be regenerated as HgCl 2solution is to recycle.Due to Hg 2cl 2precipitation severe toxicity, needs in production process strengthen management and operate.(3) sodium sulfide method: the method is the technology of Japanese Dong Bang company exploitation.Flue gas enters spray column, sprays into sodium sulfide solution in scrubbing tower, now, in flue gas the mercury of 95-98% and sodium sulfide solution generate mercuric sulphide precipitation and be able to separated, thereby remove mercury.

Chemical oxidization method: the Hg in flue gas 2+compound is more soluble in water, in wet method fume desulfurizing system (WFGD), be no matter with lime or lime stone or active carbon as absorbent, all can remove approximately 90% Hg 2+, and to Hg 0significantly do not remove effect.Catalytic action by Cucumber is by Hg 0be oxidized to Hg 2+compound, and then adopt conventional method to remove Hg 2+, Elemental Mercury is transformed into divalence mercury and just than being easier to, has removed.(1) before flue gas enters desulfurizing tower, add certain catalyst as palladium class, carbon back class material, they can impel Hg 0oxidation forms Hg 2+compound, thereby the removal efficiency of raising mercury.(2) selective catalysis reduction apparatus (SCR) can be nitrogen by reduction of nitrogen oxide, also can effectively promote Hg 0oxidation.The experimental test in Germany power station finds that flue gas is by after SCR reactor, Hg 0portion drops to 2%~12% by 40%~60% of entrance, and this has absolutely proved that catalytic reduction device (SCR) is to Hg 0also there is oxidation.

In the prior art, dedusting, desulphurization and denitration, the removal of mercury and smoke evacuation are all as independently unit operations setting, in flue gas is processed, there is independent dedusting, desulphurization and denitration, the removal of mercury and smoke evacuation unit, each unit is independent of each other, independent operation, realizes respectively dedusting, desulphurization and denitration, the removal of mercury and smoke evacuation operation, does not consider the correlation of above-mentioned pollutant removing operation.This just causes the defects such as construction cost is high, floor space is large, and removal efficiency is low, operating cost is high.

Although domestic, coal-fired plant flue gas denitration desulfurization is removed that heavy metal is integrated to be studied, such as < < coal-fired plant flue gas denitration desulfurization removes heavy metal Study on Integration > > (Hu Manyin etc., industry security and environmental protection, the 32nd the 2nd phase of volume in 2006) disclose a kind of integral process, this technique is adopting NH 3on basis as the SCR method denitration of reducing agent, in SCR reactor, adopt and take the Cu oxide absorbent denitration simultaneously desulfurization that flying dust is carrier and remove heavy metal.This technique is owing to adopting cupric oxide adsorbent, cause cost higher, its plant area area is still larger simultaneously, and absorption method is subject to the restriction of adsorption efficiency, cause removal efficiency low, the pollutant removing degree of depth is inadequate, can not meet the dedusting of existing power plant, denitration, desulfurization and remove the integrated demand of heavy metal.

Summary of the invention

The present invention is directed to prior art with the control main line of Single Pollution thing, each unit independently exists, do not take into full account the relation between various pollutants in flue gas, do not consider the defect of influencing each other between each pollutant controlled condition, each pollutant preparation, PROCESS COUPLING and chemical conversion yet, with and cause with high investment, high operating cost and floor space huge, even a lot of transformation projects do not have space to put the defect of equipment at all, have developed combined unit and the process thereof of a kind of coal-fired flue-gas dust-removing, desulphurization and denitration, demercuration and smoke evacuation.

First aspect present invention provides the combined unit of a kind of coal-fired flue-gas dust-removing, desulphurization and denitration, demercuration and smoke evacuation, its in mainly comprising, have excellent grid layer 7 excellent grid moisture film tower 1, electrocatalysis oxidation device 3, oxidizing tower 4, in the spray liquid circulatory system that has the chimney 6 of excellent grid layer 7 and be attached to excellent grid moisture film tower 1 and chimney 6.Rod grid moisture film tower 1 bottom or bottom have gas approach, its exhanst gas outlet successively connects electrocatalysis oxidation device 3 and oxidizing tower 4 by flue 2, oxidizing tower 4 exhanst gas outlets connect the smoke inlet of chimney 6 by air-introduced machine 5, rod grid moisture film tower 1 and chimney 6 inside are equipped with excellent grid layer 7, above excellent grid layer 7, be provided with water-distributing device or spray equipment, water-distributing device or spray equipment are communicated with spray liquid circulatory system fluid.

The excellent grid layer 7 of rod grid moisture film tower 1 and chimney 6 is all connected with the spray liquid circulatory system, to provide spray liquid to excellent grid layer 7.The spray liquid circulatory system mainly comprises circulation liquid pool 9, circulating pump 10 and is positioned at water-distributing device or the spray equipment of excellent grid layer 7 top.Circulation liquid pool 9 is communicated with excellent grid moisture film tower 1 and/or chimney bottom fluid, and is communicated with water-distributing device or spray equipment fluid by circulating pump 10.The spray liquid circulatory system that the excellent grid layer 7 of rod grid moisture film tower 1 and chimney 6 is connected can be identical, also can be different.

The preferred external electrocatalysis oxidation device 3 of circulation liquid pool 9, and/or fresh spray liquid adding set and/or waste liquid, sediment remove, with realize pollutant in spray liquid purification, increase fresh spray liquid, remove sediment and with the spray liquid of mistake.

In rod grid layer, preferably every 3 excellent grid are isosceles triangle arrangement.Rod grid layer 7 and water-distributing device or spray equipment can be done the setting that repeats of excellent grid layer/water-distributing device or spray equipment/excellent grid layer/water-distributing device or spray equipment from bottom to top, and repeat number is 2-7, preferably 2-4.

The top of chimney 6 is preferably provided with demister 8, more preferably below demister 8, is provided with flushing water 11 devices.

Preferably between the gas approach of excellent grid moisture film tower 1, excellent grid moisture film tower 1 exhanst gas outlet and electrocatalysis oxidation device 3 outlets, between oxidizing tower 4 exhanst gas outlets and chimney 6 smoke inlets, chimney 6 smoke outlets arrange respectively sensor, the sensor is connected with central control computer, and central control computer is controlled respectively the spray liquid circulatory system and electrocatalysis oxidation device 3.

As the improvement of the combined unit of first aspect present invention, second aspect present invention provides a kind of combined unit of coal-fired flue-gas dust-removing, desulphurization and denitration, demercuration and smoke evacuation of vertical layout.For the occupation of land space of economy system, and effectively utilize the feature that hot flue gas proportion is little, climbing power is large, thereby reduce exhaust resistance, save energy consumption, the combined unit of first aspect present invention is vertically arranged.Its in mainly comprising, have excellent grid layer 7 excellent grid moisture film tower 1, electrocatalysis oxidation device 3, oxidizing tower 4, in the spray liquid circulatory system that has the chimney 6 of excellent grid layer 7 and be attached to excellent grid moisture film tower 1 and chimney 6.Rod grid moisture film tower 1 bottom or bottom have gas approach, oxidizing tower 4 exhanst gas outlets connect the smoke inlet of chimney 6 by air-introduced machine 5, rod grid moisture film tower 1 and chimney 6 inside are equipped with excellent grid layer 7, above excellent grid layer 7, be provided with water-distributing device or spray equipment, water-distributing device or spray equipment are communicated with spray liquid circulatory system fluid.Rod grid moisture film tower 1 and oxidizing tower 4 share a tower body, tower body the latter half arranges excellent grid layer 7 and water-distributing device, form excellent grid moisture film tower 1, the external electrocatalysis oxidation device 3 of tower body the first half, form oxidizing tower 4, the compound tower body of rod grid moisture film tower 1 and oxidizing tower 4 is arranged in pedestal, arranges chimney 6 on pedestal.Chimney 6 is positioned at the top of described compound tower body.

Third aspect present invention provides the combined technique of a kind of coal-fired flue-gas dust-removing, desulphurization and denitration, demercuration and smoke evacuation.Flue gas enters from excellent grid moisture film tower 1 smoke inlet, from bottom to top through excellent grid layer 7, in excellent grid layer 7 with spray liquid counter current contacting, by flue 2 and hydroxyl free radical, active oxygen atom from electrocatalysis oxidation device 3, be mixed into oxidizing tower 4, in oxidizing tower, carry out after oxidation reaction, flue gas autoxidation tower 4 exhanst gas outlets enter the smoke inlet of chimney 6, and flue gas passes excellent grid layer 7 from bottom to top in chimney, in excellent grid layer 7, with spray liquid counter current contacting, flue gas enters atmosphere from chimney breast.

Spray liquid is after excellent grid layer 7 contacts with flue gas adverse current, and the bottom that enters excellent grid moisture film tower 1 or chimney 6 is collected, and enters subsequently circulation liquid pool 9, by circulating pump 10, spray liquid self-loopa liquid pool 9 is introduced to water-distributing device or spray equipment.Preferably with the spray liquid in 3 pairs of circulation liquid pools 9 of electrocatalysis oxidation device, process, to remove nitrogen oxide, oxysulfide and the mercury in spray liquid.Preferably regularly in circulation liquid pool 9, add fresh spray liquid, the regular sediment in cycle for the treatment of liquid pool 9, and regular discharge section spray liquid from circulation liquid pool 9.

Demister 8 is preferably set, to remove the steam of carrying secretly in flue gas in chimney top.Flushing water 11 is more preferably set below demister 8, to clean demister 8.

Preferably, by the concentration of flue dust, sulfide, nitrogen oxide and mercury in Sensor monitoring rod grid moisture film tower 1 smoke inlet place flue gas, central control computer is set the spray flux of excellent grid moisture film tower 1 spray liquid according to this monitoring concentration.

Preferably by Sensor monitoring, leave the concentration of flue dust, sulfide, nitrogen oxide and mercury in the flue gas of excellent grid moisture film tower 1 exhanst gas outlet, central control computer is according to the spray flux of this concentration adjusting rod grid moisture film tower 1 spray liquid and set the power of electrocatalysis oxidation device 3.

Preferably by Sensor monitoring, leave the concentration of flue dust, sulfide, nitrogen oxide and mercury in the flue gas of oxidizing tower 4, central control computer is adjusted the power of electrocatalysis oxidation device 3 according to this concentration and is set the spray flux of chimney 6 spray liquids.

Preferably, by the concentration of flue dust, sulfide, nitrogen oxide and mercury in Sensor monitoring chimney 6 smoke outlet flue gases, central control computer is adjusted the spray flux of chimney 6 spray liquids according to this concentration.

Described spray liquid is water or alkaline solution.

One of useful technique effect of the present invention is to utilize the process integration of front and back stages rod grid (the excellent grid in excellent grid moisture film tower and chimney) and catalytic oxidation smoke treatment to carry out flue dust, sulfide, itrated compound, mercury and the smoke evacuation in smoke treatment.Wonderful discovery, adopts front and back stages rod grid and electrocatalysis oxidation device to process coal-fired flue-gas, and under equal treatment conditions, the content of the pollutants such as the flue dust in flue gas, sulfide and itrated compound and mercury sharply reduces, and has obtained unforeseeable technique effect.

Two of useful technique effect of the present invention is to adopt two-stage rod grid moisture film to realize front and back stages dedusting, desulphurization and denitration and demercuration operation.Excellent grid have been realized the mass-transfer efficiency that approaches filler simultaneously, because excellent grid space has overcome greatly packing layer, exist quiet liquid song to cause the defect of incrustation, have strengthened the efficiency of dedusting, desulphurization and denitration and demercuration.

Three of useful technique effect of the present invention is, in dedusting, desulphurization and denitration, demercuration and smoke evacuation combined unit and technique, effectively utilized the idle space of chimney, in chimney, be provided with excellent grid layer, realized two-stage dust removal, desulphurization and denitration and demercuration operation, overcome prior art chimney and only as the technology of smoke evacuation use, be accustomed to.

Four of useful technique effect of the present invention is, dedusting, desulphurization and denitration, demercuration and smoke evacuation combined unit whole vertically (up and down) are arranged, effectively reduce the floor space of device, and reduced greatly the resistance of flue gas operation, the energy consumption of having saved air-introduced machine.

Accompanying drawing explanation

Fig. 1 is the combined unit artwork of flue gas ash removal of the present invention, desulphurization and denitration, demercuration and smoke evacuation

Fig. 2 is the combined unit artwork that the present invention vertically arranges flue gas ash removal, desulphurization and denitration, demercuration and smoke evacuation

The specific embodiment

As shown in Figure 1, flue gas ash removal of the present invention, desulphurization and denitration, demercuration and smoke evacuation combined unit mainly comprise: excellent grid moisture film tower 1, electrocatalysis oxidation device 3, oxidizing tower 4, chimney 6 and comprise that other affiliated facilities of spray liquid cycle facilities form.

Rod grid moisture film tower 1 has gas approach, and this gas approach is positioned at bottom, bottom or the ,Qi position, middle and lower part of excellent grid moisture film tower 1 can be according to concrete technique for applying condition etc., by those skilled in the art, according to design specification, is freely changed.Above gas approach, be provided with excellent grid layer 7, and the arrangement mode that is isosceles triangle according to every 3 excellent grid arranges excellent grid, the number of rod grid can arrange according to flue gas treating capacity, processing requirements etc. are concrete, the setting of this rod grid number to those skilled in the art, be easily to determine, therefore no longer specifically describe.Above whole excellent grid layer, be provided with water-distributing device or spray equipment.

As change, for increasing spray efficiency, or disposal ability causes more greatly the larger generation enlarge-effect of device diameters, can between excellent grid layer, one or more water-distributing devices or spray equipment be set, form excellent grid layer/water-distributing device (spray equipment)/excellent grid layer/water-distributing device (spray equipment) ... repeat arrange, repeat number can be 2 or larger, between layers suitable setting space.

Rod grid moisture film tower 1 is provided with the spray liquid circulatory system, and this spray liquid circulatory system mainly comprises circulation liquid pool 9, electrocatalysis oxidation device 3, circulating pump 10 and corresponding connecting pipeline.In the bottom of excellent grid moisture film tower 1, be provided with the space of storing spray liquid, to form the fluid-tight of certain ability when device moves.This storage space is communicated with circulation liquid pool 9 fluids that are arranged at device outside, and so that the spray liquid of this storage space is conveyed in circulation liquid pool 9, circulation liquid pool 9 is communicated with water-distributing device or spray equipment fluid by circulating pump 10, to spray spray liquid to excellent grid.Circulation liquid pool 9 is communicated with electrocatalysis oxidation device 3 fluids, to store the pollutant in spray liquid in purified treatment circulation liquid pool 9.

Rod grid moisture film tower 1 top is communicated with oxidizing tower 4 by flue 2, and electrocatalysis oxidation device 3 is communicated with the flue fluid between oxidizing tower 4 with excellent grid moisture film tower 1, to process the flue gas passing through.

Oxidizing tower 4 is communicated with the smoke inlet fluid of the bottom of chimney 6 by air-introduced machine 5, so that flue gas is introduced to chimney 6 from oxidizing tower 4.On the smoke inlet top of chimney, be provided with excellent grid layer 7, excellent grid are the arrangement mode setting of isosceles triangle according to every 3 excellent grid, and the number of excellent grid can arrange according to flue gas treating capacity, processing requirements etc. are concrete.Above whole excellent grid layer, be provided with water-distributing device or spray equipment.

Setting as excellent grid moisture film tower 1, as change, for increasing spray efficiency, or disposal ability causes more greatly the larger generation enlarge-effect of device diameters, can between excellent grid layer, one or more water-distributing devices or spray equipment be set, form excellent grid layer/water-distributing device (spray equipment)/excellent grid layer/water-distributing device (spray equipment) ... repeat arrange, repeat number can be 2 or larger, between layers suitable setting space.

Excellent grid layer set-up mode in chimney 6 can be identical with the set-up mode in excellent grid moisture film tower 1, also can be different, and it can freely be selected by those skilled in the art under concrete applied environment.

Chimney 6 is provided with the spray liquid circulatory system equally, identical with the spray liquid circulatory system of excellent grid moisture film tower 1, and this spray liquid circulatory system mainly comprises circulation liquid pool 9, electrocatalysis oxidation device 3, circulating pump 10 and corresponding connecting pipeline.In the bottom of chimney 6, be provided with the space of storing spray liquid, to form the fluid-tight of certain ability when device moves.This storage space is communicated with circulation liquid pool 9 fluids that are arranged at device outside, and so that the spray liquid of this storage space is conveyed in circulation liquid pool 9, circulation liquid pool 9 is communicated with water-distributing device or spray equipment fluid by circulating pump 10, to spray spray liquid to excellent grid.Circulation liquid pool 9 is communicated with electrocatalysis oxidation device 3 fluids, to store the pollutant in spray liquid in purified treatment circulation liquid pool 9.

Chimney 6 middle and upper parts, preferably top, is provided with one or more demisters 8, is provided with flushing water outlet 11 below demister 8, with to demister 8 spray irrigation water.This flushing water outlet 11 is communicated with outside flushing water source fluid.

For overcoming the corrosion of flue gas middle acid substance to device, the weight of alleviator, the material of excellent grid moisture film tower 1 and chimney 6 preferably adopts fiberglass.

As the preferred technical solution of the present invention, for realizing the Comprehensive Control of this dedusting, desulphurization and denitration, demercuration and smoke evacuation combined unit, improve removal efficiency and reduce energy consumption, this device also after the excellent grid layer 7 of excellent grid moisture film tower 1 gas approach place, excellent grid moisture film tower 1 before electrocatalysis oxidation device 3 access flues 2, after oxidizing tower 4 before chimney 6 smoke inlets, the smoke outlet of chimney 6 is respectively equipped with pollutant sensor, described sensor can effective monitoring flue gas in the concentration of flue dust, oxysulfide, nitrogen oxide and mercury.Described sensor is connected with central control computer, so that the signal recording is conveyed into central control computer, central control computer is according to predefined flue gas monitoring value, control circulating pump or controllable valve in the spray liquid circulatory system, and the power of electrocatalysis oxidation device, to control spray liquid, increase or reduce, and the power of electrocatalysis oxidation device.

As shown in Figure 1, flue gas, it can be from the boiler unit of coal-burning power plant, also can be from other coal combustion equipment, or other produce the equipment of flue gases, enter the excellent grid moisture film tower 1 of top by the smoke inlet of excellent grid moisture film tower 1, and flue gas is from bottom to top by excellent grid layer.Spray liquid in circulating pump 10 liquid pools of self-loopa in the future 9 is transported to spray equipment or the water-distributing device of tower top, by spray or distribution apparatus, spray liquid is evenly distributed on tower cross section, and spray liquid is from top to bottom by excellent grid layer.

In excellent grid layer, spray liquid, by the collision with excellent grid, flue gas, produces liquid net, liquid film or drop in excellent grid layer, and flue gas and described liquid net, liquid film or droplet collision carry out mass transfer and the concurrent biochemical reaction of conducting heat.Flue dust in flue gas is constantly assembled when contacting with spray liquid, and particle progressively increases and enters spray liquid; Sulfide in flue gas, such as SO 2, SO 3and H 2s etc., with alkali substance reaction in spray liquid and generate soluble salt or insoluble matter, thereby separation enters spray liquid from flue gas; Nitride in flue gas, such as NO 2deng, equally with alkali substance reaction in spray liquid and from flue gas the separated spray liquid that enters into; Soluble mercury in flue gas, or be dissolved in spray liquid, or react with spray liquid, thereby from flue gas, separate.The pollutant not removing is mainly NO, N xthe mercury of O and 0 valency, and at the excellent grid layer oxysulfide removing not yet in effect, nitrogen oxide and a small amount of flue dust, with flue gas, from excellent grid moisture film tower 1 tower top, leave and enter flue 2, thereby primary dust removing, first grade desulfurizing, one-level denitration and the operation of one-level demercuration completed.

Spray liquid after contacting with flue gas, after the bottom that enters excellent grid moisture film tower 1 from excellent grid layer 7 top is collected and is cushioned, bottom or lower part outlet from excellent grid moisture film tower 1 enter circulation liquid pool 9, in circulation liquid pool 9, remove sediment, reclaim the operations such as sulfide, optionally carry out alternatively spray liquid regeneration or supplement fresh spray liquid operation.Spray liquid pool is preferably connected with electrocatalysis oxidation device 3, to regenerate spray liquid reclaim sulfide.Spray liquid after treatment extracts and enters spray equipment or water-distributing device through circulating pump 10, again removes pollutant operation in flue gas, thereby completes the cyclic process of spray liquid.The composition of this spray liquid circulatory system and the method for operation can be identical with prior art, and it can have all improvement such as sulfide retracting device of prior art.Spray liquid can be water, alkaline detergent solution etc., and it is same as the prior art.

In excellent grid moisture film tower 1, due to product word arrangement and the flue gas of uniqueness and the way of contact of spray liquid of excellent grid, effectively increased the contact area of spray liquid and flue gas, increased treating capacity and the treatment effeciency of unit interval.Compared to conventional alkalescence spray, remove system, the treating capacity of this rod grid moisture film tower 1 has increased 15%, and the removal efficiency to flue dust, sulfide, nitride and mercury, has increased at least 10%.

Leave the flue gas of excellent grid moisture film tower 1, before entering oxidizing tower 4, contact with electrocatalysis oxidation device 3 with 0 valency mercury in pollutant, particularly flue gas in catalytic oxidation (Electro-Catalytic Oxidation) flue gas.Electrocatalysis oxidation device 3 (ECO) produces high energy electron, high energy electron and H by application non-thermal plasmas 2o and O 2collision, produces hydroxyl free radical and active oxygen atom, and these free radicals enter the flue gas passing through in flue 2, and enter oxidizing tower with flue gas.Follow flue gas enter the process of oxidizing tower in and in oxidizing tower, hydroxyl free radical and active oxygen atom by the NO in flue gas be transformed into can basic treatment NO 2, the mercury of 0 valency is transformed into mercury oxide (HgO), can also be the SO of a small amount of (lower than 20%) 2be transformed into SO 3.NO 2water-soluble, HgO also available alkaline spray liquid processes, and the two all can remove by alkaline solution in scrubbing tower subsequently.

Due to electrocatalysis oxidation device small volume, process the degree of depth larger, therefore adopt By Electrocatalytic Oxidation smoke treatment, can be effectively by the NO or the N that are difficult in flue gas remove by alkaline spray liquid washing xo and 0 valency Hg, change the NO that can wash removal into 2and HgO, thereby can in subsequent step, by spray washing, remove.Experiment showed, the flue gas of processing by electrocatalysis oxidation device, compare with conventional treatment method, nitrogen oxide reduces by 18%, 0 valency Hg and reduces 20%.

The flue gas of processing through catalytic oxidation, in autoxidation tower 4, by air-introduced machine 5 guiding, entered the gas approach of chimney 6, subsequently from bottom to top by the excellent grid layer 7 in chimney 6, in excellent grid layer, flue gas reacts with the spray liquid under spraying from top to bottom, its reactive mode and the method for operation are identical with excellent grid moisture film tower, repeat no more herein.The mercury of remaining a small amount of flue dust and the nitrogen oxide producing by catalytic oxidation, oxysulfide and non-zero valency in flue gas, react and enter spray liquid with alkaline spray liquid, clean flue gas makes progress along chimney, through the demister 8 of top, removes mist and/or the drop in flue gas, carried secretly.In chimney 6, two-stage dust removal, two-grade desulfurizing, secondary denitration and the secondary demercuration of flue gas have been realized, in treated flue gas, flue gas, sulfide, itrated compound and mercury emissions all reach or far below after national standard or established standards, flue gas leaves chimney 6 and enters atmosphere.

Excellent grid layer in chimney 6 has the spray liquid circulatory system equally, and this system operation mode, set-up mode are identical with excellent grid moisture film tower.That is: the spray liquid after contacting with flue gas, after the bottom that enters chimney 6 from excellent grid layer 7 top is collected and is cushioned, from chimney 6 bottom or lower part outlet enter circulation liquid pool 9, in circulation liquid pool 9, remove sediment, reclaim the operations such as sulfide, optionally carry out alternatively spray liquid regeneration or supplement fresh spray liquid operation.Spray liquid pool is preferably connected with electrocatalysis oxidation device 3, to regenerate spray liquid reclaim sulfide.Spray liquid after treatment extracts and enters spray equipment or water-distributing device through circulating pump 10, again removes pollutant operation in flue gas, thereby completes the cyclic process of spray liquid.

As described in the background section, prior art has existed coal-fired plant flue gas denitration desulfurization to remove mercury integral process, but there is not the process integration that simultaneously utilizes front and back stages rod grid (the excellent grid in excellent grid moisture film tower and chimney) and catalytic oxidation smoke treatment in prior art up to the present.And, wonderful discovery, after adopting front and back stages rod grid and electrocatalysis oxidation device, under equal treatment conditions, the content of the pollutants such as the flue dust in flue gas, sulfide and itrated compound and mercury sharply reduces.Believe that this is that front and back stages rod grid and electrocatalysis oxidation device have produced synergy.Although its synergistic principle is unknown, but by inference, the flue gas that leaves excellent grid moisture film tower 1 has carried the dust of certain moisture and alkaline matter, the collision that above-mentioned substance produces electronics through electrocatalysis oxidation device 3, with respect to the electrocatalysis oxidation device of isolated operation, more free radical and active oxygen atom have been produced; Meanwhile, after oxidizing tower 4, unreacted completely free radical and active oxygen atom enters the excellent grid layer of chimney 6, has effectively promoted reacting of spray liquid and sulfureous in flue gas oxide in excellent grid layer, nitrogen oxide, non-zero valency mercury.Through twice synergy stack, believe and produced above-mentioned cooperative effect.Applicant believes, the former of this cooperative effect ought to approach above-mentioned supposition, but above-mentioned supposition should not be considered as the restriction to this cooperative effect, that is, even if do not understand the principle that this cooperative effect produces, this cooperative effect is also true existence.

According to applicant's measuring, adopt after the combined unit and process of flue gas ash removal of the present invention, desulphurization and denitration, demercuration and smoke evacuation, leave the highest can be of removal efficiency of flue dust, sulfide, itrated compound and mercury in the flue gas that chimney enters atmosphere: 99.997%, 99.995%, 99.995% and 99.995%, it is well below the requirement of existing national standard and provincial standard.As a comparison, under equal treatment process condition, in prior art, leaving in the flue gas that chimney enters atmosphere the content of flue dust, sulfide, itrated compound and mercury is respectively and is generally 99.9%, 99.9%, 99.9%, 99.9%, the removal efficiency that is front and back stages rod grid and electrocatalysis oxidation device coupling technique is the more than at least 10 times of prior art, and cooperative effect is very remarkable.Certainly, according to different environmental protection standards, the flue gas ash removal of combined unit of the present invention and process, desulphurization and denitration, demercuration rate can adjust, such as being all reduced to 99.99%.

As the preferred technical solution of the present invention, sensor, central control computer and process control device can be set in whole device, to realize Comprehensive Control and the integrated control of technique.Be arranged at the first sensor of excellent grid moisture film tower 1 gas approach, the initial concentration of flue dust, sulfide, nitrogen oxide and the mercury of monitoring in flue gas also generates signal and is conveyed into central control computer.Central control computer is according to predefined washing intensity, controlled circulation pump 10 and relevant controllable valve, thereby the washing intensity of setting according to central control computer regulates the supply of spray liquid, thereby the removal efficiency of control rod grid moisture film tower 1 pair of flue dust, sulfide, nitrogen oxide and mercury (particularly mercury).

Between excellent grid moisture film tower 1 exhanst gas outlet and electrocatalysis oxidation device, be provided with the second sensor, this Sensor monitoring leaves content or the concentration of flue dust, sulfide, nitrogen oxide and mercury in excellent grid moisture film tower 1 flue gas, and generation signal is conveyed into central control computer.After the preset value contrast of this signal value and central control computer, make correction value, central control computer is by the spray liquid supply of aforementioned running fine regulation rod grid moisture film tower 1.Simultaneously, according to this monitor value, central control computer, according to pre-set programs, sends a signal to electrocatalysis oxidation device 3, thereby control the generation quantity that electrocatalysis oxidation device generates free radical and active oxygen atom, reach the object of controlling catalytic oxidation nitrogen oxides in effluent, oxysulfide and mercury.

Between oxidizing tower 4 exhanst gas outlets and chimney 6 smoke inlets, be provided with the 3rd sensor, this Sensor monitoring leaves concentration or the content of flue dust, sulfide, nitrogen oxide and the mercury of oxidizing tower, and generates electric signal transmission to central control computer.Central control computer is according to pre-set programs, according to the signal of the 3rd sensor, after the preset value contrast of central control computer, make correction value, feed back to electrocatalysis oxidation device 3, thereby revise free radical and active oxygen atom that electrocatalysis oxidation device produces, to reach the control to sulfide in flue gas, nitrogen oxide and mercury.Simultaneously, central control computer is according to the detected value of the 3rd sensor, control circulating pump 10 and the corresponding controllable valve of chimney 6, thereby set the supply that washing intensity regulates chimney 6 rod grid layer 7 spray liquid, and then control the removal efficiency of excellent grid layer 7 pairs of flue dust, sulfide, nitrogen oxide and heavy metal (particularly mercury) in chimney 6.

At chimney 6 exhanst gas outlet ends, four-sensor is installed, this sensor is used for monitoring flue gas flue dust, sulfide, nitrogen oxide and mercury concentration or the content that leaves chimney 6 and enter atmosphere, and this monitoring result is transferred to central control computer.Central control computer, according to preset value, with this four-sensor monitoring result comparison, is then made correction value, revises the spray liquid supply of chimney 6.

The sensor group that above-mentioned first sensor~the four-sensor can be comprised of independent dust concentration sensor, sulfide sensor, NOx sensor and mercury sensor can be to be also wholely set or integrated flue dust, sulfide, nitrogen oxide and mercury sensor.No matter be independent sensor or be wholely set or integrated sensor, are all existing products, can buy finished product or entrust relevant enterprise customed product by market, the present invention is no longer described in detail with regard to its structure or principle again.The concrete setting of the sensor type can be by person of ordinary skill in the field according to site technique condition setting.

Pre-set programs in central control computer and corresponding preset value are all routine techniques of affiliated technical field.The setting of pre-set programs, it can be the empirical equation obtaining based on experimental data, also can be the guide based on existing workshop manual, no matter based on which kind of means, it is all prior aries, person of ordinary skill in the field can obtain under the prerequisite of not paying creative work, and the present invention is no longer with regard to its detailed description.Corresponding preset value, can the experience based on corresponding experimental data set equally, or the guide of existing workshop manual, and it is prior art equally, and the present invention also no longer repeats it.

By the setting of the control appliances such as the sensor, central control computer and corresponding control valve, circulating pump, the final result realizing is when the flue gas that guarantees to enter atmosphere reaches respective standard, realizes the optimal treatment of whole technical process.Through applicant's experimental verification, realizing under the prerequisite of identical standard limit of smog release, adopt the setting of the sensor, central control computer and control appliance, can save spray liquid 18%, the energy consumption of whole technique has also reduced by 14%.The technique effect of obtaining from it, adopt after above-mentioned control mode, the present invention has realized the optimization of the combined unit technical process of flue gas ash removal, desulphurization and denitration, demercuration and smoke evacuation, and the technique effect of its generation is far beyond person of ordinary skill in the field's expection, has obtained unforeseeable technique effect.

Improvement as technology shown in accompanying drawing 1 of the present invention, as shown in Figure 2, dedusting of the present invention, desulphurization and denitration, demercuration and smoke evacuation combined unit adopt vertically and arrange, that is: this combined unit in mainly comprising, have excellent grid layer 7 excellent grid moisture film tower 1, electrocatalysis oxidation device 3, oxidizing tower 4, in the spray liquid circulatory system that has the chimney 6 of excellent grid layer 7 and be attached to excellent grid moisture film tower 1 and chimney 6.Rod grid moisture film tower 1 bottom or bottom have gas approach, oxidizing tower 4 exhanst gas outlets connect the smoke inlet of chimney 6 by air-introduced machine 5, rod grid moisture film tower 1 and chimney 6 inside are equipped with excellent grid layer 7, above excellent grid layer 7, be provided with water-distributing device or spray equipment, water-distributing device or spray equipment are communicated with spray liquid circulatory system fluid.Rod grid moisture film tower 1 and oxidizing tower 4 share a tower body as combination tower, tower body the latter half is provided with excellent grid layer 7 and water-distributing device, form excellent grid moisture film tower 1, the external electrocatalysis oxidation device 3 of tower body the first half, form oxidizing tower 4, the compound tower body of rod grid moisture film tower 1 and oxidizing tower 4 is arranged in pedestal, arranges chimney 6 on pedestal, and chimney 6 is positioned at the top of described compound tower body.

For alleviating the pressure that bears of pedestal, chimney 6 of the present invention preferably adopts glass steel material.

Flue gas is from the bottom of combination tower, and the bottom of excellent grid moisture film tower 1 enters, and flue gas is from bottom to top through excellent grid layer 7, with the cleaning solution counter current contacting from water-locator or spray equipment, the flue dust in flue gas, oxysulfide, NO 2and Hg 2+from flue gas, wash-out out enters cleaning solution, and the flue gas after washing is advanced into the upper semisection of combination tower on continuing, and oxidizing tower 4.

Electrocatalysis oxidation device produces hydroxyl free radical and active oxygen atom, and hydroxyl free radical and active oxygen atom are transported to oxidizing tower 4, and in the space of oxidizing tower 4, flue gas reacts while mixing with hydroxyl free radical and active oxygen atom, and the NO oxidation in flue gas generates NO 2, Hg generates Hg 2+, mixture, through behind the space of oxidizing tower 4, enters the smoke inlet of chimney 6 through air-introduced machine 5.

Flue gas is at interior excellent grid water film dedusting, desulphurization and denitration and the demercuration of carrying out equally of chimney 6, it is identical with technique shown in Fig. 1, and the present invention repeats no more, the demister 8 that treated flue gas arranges through chimney 6 tops, remove after the mist and/or steam that flue gas carries secretly, enter atmosphere.

Identical with the technique shown in Fig. 1, technique shown in Fig. 2 has the spray liquid circulatory system equally, and whole device arranges sensor, central control computer and process control device equally, realizes Comprehensive Control and the integrated control of technique, above-mentioned setting is identical with Fig. 1, and the present invention repeats no longer at this point.

With respect to the device shown in Fig. 1, Fig. 2 shown device vertically arranges, and the floor space of whole process equipment, less than 30% of Fig. 1, has been saved in the old technology transformation of ,Qi space, space anxiety greatly, advantageous particularly.Secondly, because the proportion of hot flue gas is little, rising power is large, and with respect to horizontally disposed, each process equipment of the present invention is vertically arranged, can greatly reduce the resistance of flue gas operation, so the energy consumption of air-introduced machine declines greatly, has saved energy consumption.

Applicant's statement, the present invention adopts aforesaid way to be described in detail, but does not mean that the present invention must rely on above-mentioned setting in detail and could implement.Understanding based on affiliated technical field technical staff, the equivalence of any technological means is replaced or the specifically selection of mode, within all dropping on protection domain of the present invention.

Claims (3)

1. the combined unit of a flue gas ash removal, desulphurization and denitration, demercuration and smoke evacuation, it is characterized in that, this combined unit in mainly comprising, have excellent grid layer (7) excellent grid moisture film tower (1), electrocatalysis oxidation device (3), oxidizing tower (4), in have the chimney (6) of excellent grid layer (7) and be attached to excellent grid moisture film tower (1) and the spray liquid circulatory system of chimney (6); Rod grid moisture film towers (1) bottom or bottom have gas approach, its exhanst gas outlet successively connects electrocatalysis oxidation device (3) and oxidizing tower (4) by flue (2), oxidizing tower (4) exhanst gas outlet connects the smoke inlet of chimney (6) by air-introduced machine (5), rod grid moisture film towers (1) and chimney (6) inside are equipped with excellent grid layer (7), in excellent grid layer (7) top, be provided with water-distributing device, water-distributing device is communicated with spray liquid circulatory system fluid.
2. a flue gas ash removal, desulfurization, denitration, the combined unit of demercuration and smoke evacuation, it is characterized in that, this combined unit has the excellent grid moisture film tower (1) of excellent grid layer (7) in mainly comprising, electrocatalysis oxidation device (3), oxidizing tower (4), inside there is the chimney (6) of excellent grid layer (7) and be attached to excellent grid moisture film tower (1) and the spray liquid circulatory system of chimney (6), rod grid moisture film towers (1) bottom or bottom have gas approach, oxidizing tower (4) exhanst gas outlet connects the smoke inlet of chimney (6) by air-introduced machine (5), rod grid moisture film towers (1) and chimney (6) inside are equipped with excellent grid layer (7), in excellent grid layer (7) top, be provided with water-distributing device, water-distributing device is communicated with spray liquid circulatory system fluid, rod grid moisture film towers (1) and oxidizing tower (4) share a tower body and form combination tower, combination tower the latter half arranges excellent grid layer (7) and water-distributing device, form excellent grid moisture film tower (1), the external electrocatalysis oxidation device of combination tower the first half (3), form oxidizing tower (4), the compound tower body of rod grid moisture film towers (1) and oxidizing tower (4) is arranged in pedestal, on pedestal, arrange chimney (6), chimney (6) is positioned at the top of described compound tower body.
3. combined unit according to claim 1 and 2, is characterized in that, the water-distributing device arranging in excellent grid layer (7) top is spray equipment.
CN201110103373.8A 2011-04-25 2011-04-25 Combined apparatus and method for dedusting, desulphurization, denitration, demercuration and smoke extraction of coal-fired flue gas CN102225303B (en)

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CN104976631A (en) * 2014-04-13 2015-10-14 祁爱儒 Totally-enclosed environment-friendly chimney
CN105879645A (en) * 2014-06-18 2016-08-24 大唐环境产业集团股份有限公司 Turbulent tube grid tower capable of improving desulfurization efficiency
CN104801163A (en) * 2015-04-30 2015-07-29 广东理文造纸有限公司 Desulfurizing tower capable of reducing discharging concentration of sulfur dioxide in smoke
CN105013276B (en) * 2015-06-16 2018-04-03 唐纯 A kind of novel coal-fired boiler smoke treatment method
CN108444773A (en) * 2018-05-10 2018-08-24 无棣县棣棠花服装加工厂 A kind of intelligentized environmental protection fume monitoring system

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