CN104607015A - Multi-pollutant co-purification method and multi-pollutant co-purification system for sintering flue gas - Google Patents
Multi-pollutant co-purification method and multi-pollutant co-purification system for sintering flue gas Download PDFInfo
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- CN104607015A CN104607015A CN201510083009.8A CN201510083009A CN104607015A CN 104607015 A CN104607015 A CN 104607015A CN 201510083009 A CN201510083009 A CN 201510083009A CN 104607015 A CN104607015 A CN 104607015A
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Abstract
The invention provides a multi-pollutant co-purification method for a sintering flue gas. The multi-pollutant co-purification method for the sintering flue gas comprises the following steps: introducing the sintering flue gas in a concentrated-phase main flue and a dilute-phase main flue according to the temperature of the flue gas and the difference of pollutant concentrations respectively, heating the flue gas, spraying a desulfurizing agent and a denitrfying agent, enabling the flue gas mixed with the denitrfying agent to flow to a catalytic filter-type dust remover, and filtering dust on the surface of a filter bag; thoroughly decomposing nitrogen oxides and dioxin under the action of a catalyst in the filter bag; and discharging clean flue gas from a chimney. A multi-pollutant co-purification system for a sintering flue gas comprises a flue gas purification device and a flue gas heating device, wherein the flue gas purification device comprises a main flue; a desulfurizing agent jet device, a denitrfying agent jet device, a catalytic filter-type dust remover and an exhaust device are sequentially arranged on the main flue along the exhaust direction of the flue gas; the flue gas at the upstream of the filter-type dust remover in the main flue is heated by the smoke heating device. The multi-pollutant co-purification method and the multi-pollutant co-purification system for the sintering flue gas disclosed by the invention are capable of realizing one-step co-purification for many pollutants of the sintering flue gas, thus energy consumption is reduced, and cost is reduced.
Description
Technical field
The present invention relates to sintering gas purifying technical field, particularly a kind of sinter fume dust granules, sulfur dioxide, nitrogen oxide are Ji the synergistic purification method of bioxin and cleaning system.
Background technology
Current sintered particles thing purification is based on electric dust-removing process, but by the impact of sinter fume composition, electric precipitation efficiency of dust collection is lower and unstable, causes that discharge absolute figure is higher and instability is even not up to standard, must seek one dedusting method more efficiently.
Simultaneously, the environmental requirement of country is more and more stricter, be proposed stricter emission limit to pollutants such as sulfur dioxide, nitrogen oxide, bioxin, steel plant must transform old dust pelletizing system, increase the equipment of desulphurization and denitration, Tuo bioxin after deduster.
The mainstream technology of current desulfurization is lime-gypsum wet desulfurization, and active coke dry-method desulfuration.Wherein, wet desulphurization investment is large, large to equipment corrosion, and easily causes secondary pollution; Active coke desulphurizing method equipment one-time investment is huge, and occupation area of equipment is huge, and adsorbent consumption is also high, and operating cost is high.
The mainstream technology of denitration is SCR SCR technology and SNCR non-catalytic reduction method, wherein, it is even higher at 350 DEG C that SCR needs to maintain flue-gas temperature, it is large that sinter fume has exhaust gas volumn, and after mixed wind flue-gas temperature lower than 150 DEG C, if increase heater, a large amount of flue gas is increased to 350 DEG C from 150 DEG C, and operating cost is huge; SNCR is at 900 ~ 1100 DEG C, under catalyst-free exists, utilizes ammonia or amino reductive is selective that NOx in flue gas is reduced to N
2and H
2o, reaction temperature is too high, and operating cost is huge.
The mainstream technology of Tuo bioxin sprays into adsorbent in flue, and as active carbon etc., but active carbon operating cost is too high, and the active carbon simultaneously adsorbing bioxin is danger wastes, needs special installation process.
Visible, the removing of each pollutant all needs the investment increasing great number, under the severe situation of current steel industry depression, must find a kind of method being applicable to the multi-pollutant synergistic purification of steel plant.
Summary of the invention
The deficiencies in the prior art in view of the above, the object of invention is to provide a kind of sinter fume multi-pollutant synergistic purification method and cleaning system, and reduce processing cost, purification efficiency is high and stable, non-secondary pollution.
For achieving the above object and other relevant objects, the invention provides a kind of sinter fume multi-pollutant synergistic purification method, comprise the following steps:
A, sinter fume is introduced concentrated phase flue collector and dilute phase flue collector respectively according to the difference of flue-gas temperature and pollutant levels, in concentrated phase flue collector, flue-gas temperature and pollutant levels are all higher than dilute phase flue collector;
B, to flue gas in dilute phase flue collector, and in concentrated phase flue collector and dilute phase flue collector, spray into desulfurizing agent and denitrfying agent all successively along flow of flue gas direction, the sulfur dioxide in flue gas and the abundant reaction desulfuration of desulfurizing agent;
C, be mixed into denitrfying agent flue gas in fan action current downflow to filtration dust catcher, the dust in flue gas is filtered on the filter bag surface of filtration dust catcher;
D, the flue gas of nitrogen oxide He bioxin being mixed with denitrfying agent enter filter bag inside through filter bag surface coating, and under the effect of filter bag internal accelerator, nitrogen oxide, Ji bioxin is thoroughly decomposed, realizes denitrating flue gas and Tuo bioxin;
Clean flue gas after f, after filtration formula deduster filter, under fan action, is discharged from chimney.
Adopt said method, the flue gas after heating enters flue collector, and flow through cleaning shaft successively, mix with desulfurizing agent and denitrfying agent, the duct section after injection desulfurization agent, the sulfur dioxide in flue gas and desulfurizing agent fully react, and realize flue gas desulfurization; Duct section after spraying denitrfying agent, is mixed into denitrfying agent in flue gas, and in fan action current downflow to filtration dust catcher; First dust in flue gas realizes removing on filter bag of dust collector surface, be mixed with nitrogen oxide of denitrfying agent Ji the flue gas of bioxin enters filter bag inside through filter bag surface coating, under the effect of filter bag internal accelerator, nitrogen oxide, Ji the thorough catalysis of bioxin, realizes denitrating flue gas and Tuo bioxin.Finally, do not contain dust, sulfur dioxide, nitrogen oxide Ji the clean flue gas of bioxin is under fan action, discharge from chimney.The method can realize sinter fume dust granules, sulfur dioxide, nitrogen oxide Ji the disposable synergistic purification of bioxin, and heating-up temperature is not high, reduces energy resource consumption, reduces costs.Wherein said filtration dust catcher inside is catalysis coated filter material, and surface coating can filter dust, inner containing catalyst fines, can catalytic degradation nitrogen oxide Ji bioxin.
The high-temperature flue gas pipeline of sintering machine head end bellows and low-temperature flue gas pipeline completely cut off, to improve flue-gas temperature in concentrated phase flue collector, can heat and can reach temperature required, and dilute phase flue collector Nei bioxin and nitrous oxides concentration low, optionally can take to heat or the mode that do not heat.
As preferably: in described step b, the outlet of ring air-cooler is communicated with flue collector, by ring air-cooler outlet exhaust to flue gas; Or heated by jet chimney companion heat.
The ring air-cooler outlet exhaust of sintering machine and flue gas of sintering machine head mix wind and heat up, and realize the utilization of waste heat.
As preferably: in described steps d, the filtration dust catcher on concentrated phase flue collector is oxidation catalyst filter formula deduster, and its internal reaction temperature maintains 150 ~ 250 DEG C, and filtration velocity is 0.3 ~ 0.8m/s.
As preferably: in described concentrated phase flue collector, temperature is 200 ~ 300 DEG C, in dilute phase flue collector, temperature is 50 ~ 100 DEG C, in concentrated phase flue collector, flue gas bioxin and nitrous oxides concentration are higher than the flue gas of dilute phase flue collector, described dilute phase flue collector position is from the flue collector closing on sintering machine head end, and length accounts for 45% ~ 55% of flue collector total length.
The nitrogen oxide generated in sinter fume is Ji bioxin mainly concentrates on high temperature section, and high temperature section nitrogen oxide is Ji the concentration of bioxin is high, and low-temperature zone nitrogen oxide is Ji the concentration of bioxin is on the low side.Dilute phase flue collector, concentrated phase flue collector cut off completely, concentrated phase flue collector temperature 200 ~ 300 DEG C of ， bioxin and nitrous oxides concentration high, dilute phase flue collector temperature 50 ~ 100 DEG C of ， bioxin and nitrous oxides concentration low.
As preferably: the filtration dust catcher on described dilute phase flue collector is gating thorn felt filter material deduster, and operating temperature is lower than 110 DEG C, and filtration velocity is 1.0 ~ 1.1m/s; Or the filtration dust catcher on described dilute phase flue collector is oxidation catalyst filter formula deduster.
Described desulfurizing agent is gypsum reagent, activated coke or ammoniacal liquor etc.Containing the CaCO of 5% ~ 15% mass ratio in gypsum reagent
3with Ca (OH)
2, the surface area of active coke adsorbent is 600 ~ 2000m
2/ g, described ammonia concn is 20% ~ 30%.Described denitrfying agent is ammoniacal liquor, and ammonia concn is 20% ~ 30%.
As preferably: the filter bag of described oxidation catalyst filter formula deduster is oxidation catalyst filter formula filter bag, comprises surface coating and the load inner substrate of catalyst fines; Dedusting function is realized by surface coating, be mixed with the clean flue gas of denitrfying agent simultaneously, can under the catalyst action of substrate surface, thoroughly degraded bioxin and nitrogen oxide, described catalyst fines is the oxide powder of Ti, Vi, W, Mo, sticks to substrate surface by a certain percentage after mixing; This catalyst fines granularity is 200 ~ 300 orders, and filter bag load capacity is 200 ~ 300g/ ㎡.
The present invention provides a kind of sinter fume multi-pollutant cooperated purification system simultaneously, comprise smoke eliminator and Smoke-heating device, described smoke eliminator comprises the flue collector for being tightly connected with sintering machine, flue collector is disposed with desulfurizing agent injection apparatus, denitrfying agent injection apparatus, filtration dust catcher and exhaust apparatus along flue gas discharge direction, described Smoke-heating device is positioned at filtration dust catcher front, heats the flue gas of flue collector internal filtering type deduster upstream.
Flue gas is through flue collector, cleaning shaft, desulfurizing agent injection apparatus, denitrfying agent injection apparatus, through Smoke-heating device, flue-gas temperature is heated to the temperature being beneficial to smoke catalytic reaction, then filtration dust catcher is entered, the purification of dust granules and sulfur dioxide is realized on filter bag surface, realize nitrogen oxide Ji the purification of bioxin in filter bag inside, the clean flue gas after process is discharged under exhaust apparatus effect.
Described flue collector is divided into concentrated phase flue collector, dilute phase flue collector by flue-gas temperature, concentrated phase flue collector and dilute phase flue collector are spaced from each other, described concentrated phase flue collector and dilute phase flue collector are provided with desulfurizing agent injection apparatus, denitrfying agent injection apparatus and filtration dust catcher, and described concentrated phase flue collector is all connected with exhaust apparatus with dilute phase flue collector tail end.
Namely filtration dust catcher arranges concentrated phase deduster, dilute phase deduster respectively, in parallel; Concentrated phase deduster, dilute phase deduster inlet duct are separate, and outlet conduit share; Establish 1 cover blower fan, 1 cover exhaust chimney altogether.
As mentioned above, the beneficial effect of the invention is:
1) by this cleaning system, can to pollutant synergistic purifications such as the dust in sinter fume, sulfur dioxide, nitrogen oxide, bioxin, do not need to increase plurality of devices, and the flue gas nitrogen oxide concentration < 300mg/Nm purifying rear discharge can be ensured
3, sulfur dioxide concentration < 200mg/Nm
3， bioxin concentration < 0.5ng-TEQ/Nm
3, particle dust content≤20mg/m
3, reach national environmental standard.
2) the present invention according to nitrogen oxide in sinter fume Ji the regularity of distribution of bioxin, control respectively according to concentrated phase, dilute phase, select common purifying method or catalytic degradation purification method according to dilute phase flue internal contamination substrate concentration, effectively reduce one-time investment, flow process is more reasonable.
3) spray into fresh desulfurizing agent all the time, ensure desulfuration efficiency stable in running; To nitrogen oxide Ji the direct catalytic degradation of bioxin, non-secondary pollution.
4) utilize mixed wind and steam tracing, maintain oxidation catalyst filter formula deduster in range of reaction temperature, avoid utilizing electrical heating means, reduce operating cost.
5) the desulfurizing agent recoverable of sulfur dioxide has been adsorbed.
6) by appropriate design, avoid by external heat source to flue gas, greatly reduce operating cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the structural representation of the embodiment of the present invention 2;
Fig. 3 is the structural representation of the embodiment of the present invention 3;
Fig. 4 is the effect schematic diagram of oxidation catalyst filter formula deduster in the embodiment of the present invention.
Piece mark explanation
1, sintering machine head end; 2, sintering machine tail; 3, bellows; 41, dilute phase flue collector; 42, concentrated phase flue collector; 5, ring air-cooler; 52, steam tracing heater; 53, air-introduced machine; 6, desulfurizing agent; 61,62, desulfurizing agent injection apparatus; 7, denitrfying agent; 71,72, denitrfying agent injection apparatus; 81,82, oxidation catalyst filter formula deduster; 83, filtration dust catcher; 801, surperficial filter membrane; 802, base material; 803, bioxin; 804, dust granules; 805, clean flue gas; 9, flue collector; 10, blower fan; 11, chimney.
Detailed description of the invention
By particular specific embodiment, working of an invention mode is described below, person skilled in the art scholar the content disclosed by this description can understand other advantages and effect of invention easily.
Embodiment 1
As shown in Figure 1, the invention provides a kind of sinter fume multi-pollutant synergistic purification method and cleaning system, wherein cleaning system comprises smoke eliminator and Smoke-heating device, smoke eliminator comprises the flue collector for being tightly connected with sintering machine, flue collector is disposed with desulfurizing agent injection apparatus 61 along flue gas discharge direction, 62, denitrfying agent injection apparatus 71, 72, , oxidation catalyst filter formula deduster 81, 82, blower fan 10, exhaust chimney 11 and dust Pneumatic conveyer, Smoke-heating device is positioned at oxidation catalyst filter formula deduster 81, 82 fronts, to oxidation catalyst filter formula deduster 81 in flue collector, the flue gas of 82 upstreams heats, guarantee entered catalysis filter formula deduster 81, in 82, flue-gas temperature is within the scope of 150 ~ 250 DEG C, to carry out catalytic reaction.Flue gas is through flue collector, cleaning shaft, desulfurizing agent injection apparatus 61,62, denitrfying agent injection apparatus 71,72, through Smoke-heating device, flue-gas temperature is heated to 150 ~ 250 DEG C, then enters oxidation catalyst filter formula deduster 81,82, realize the purification of dust granules and sulfur dioxide on filter bag surface, realize nitrogen oxide Ji the purification of bioxin in filter bag inside, the clean flue gas after process is discharged under exhaust apparatus effect.This system can realize sinter fume dust granules, sulfur dioxide, nitrogen oxide Ji the disposable synergistic purification of bioxin.
In order to reduce energy resource consumption, in the present embodiment, flue collector is divided into concentrated phase flue collector 42, dilute phase flue collector 41 by flue-gas temperature, concentrated phase flue collector 42 and dilute phase flue collector 41 are spaced from each other, it also can be a flue collector in other embodiments, concentrated phase flue collector 42 and dilute phase flue collector 41 are all disposed with desulfurizing agent injection apparatus, denitrfying agent injection apparatus and oxidation catalyst filter formula deduster, and concentrated phase flue collector 42 is all connected with blower fan with dilute phase flue collector 41 tail end.Namely filtration dust catcher is arranged in parallel concentrated phase deduster and dilute phase deduster; Concentrated phase deduster, dilute phase deduster inlet duct are separate, and outlet conduit share; Share blower fan and exhaust chimney.Because the nitrogen oxide generated in sinter fume is Ji bioxin mainly concentrates on high temperature section, high temperature section nitrogen oxide is Ji the concentration of bioxin is high, and low-temperature zone nitrogen oxide is Ji the concentration of bioxin is on the low side.Dilute phase flue collector 41, concentrated phase flue collector 42 cut off completely, concentrated phase flue collector 42 temperature 200 ~ 300 DEG C of ， bioxin and nitrous oxides concentration high, dilute phase flue collector 41 temperature 50 ~ 100 DEG C of ， bioxin and nitrous oxides concentration low.The high-temperature flue gas pipeline of sintering machine head end bellows and low-temperature flue gas pipeline are completely cut off, to improve flue-gas temperature in high-temperature flue gas pipeline, therefore in concentrated phase flue collector 42, flue-gas temperature can reach catalytic temperature condition, can heat, only Smoke-heating device need be set at dilute phase flue collector 41, and the temperature that needs reach is not high, convenient operation, reduces energy consumption.
Ring air-cooler 5 is adopted to export the mode be communicated with dilute phase flue collector 41 in this example, utilize the heat of ring air-cooler 5 outlet exhaust to flue gas, realize mixed wind and heat up, make its temperature at 150 ~ 250 DEG C, extraneous heating can not be utilized to reduce energy resource consumption further, reduce costs.
Desulfurizing agent in desulfurizing agent injection apparatus 61,62 can be gypsum reagent, activated coke or ammoniacal liquor etc.Containing mass ratio in gypsum reagent is the CaCO of 5% ~ 15%
3with Ca (OH)
2, the surface area of active coke adsorbent is 600 ~ 2000m
2/ g, ammonia concn is 20% ~ 30%.Denitrfying agent is ammoniacal liquor, and ammonia concn is 20% ~ 30%.Dilute phase flue collector 41 position is from the flue collector closing on sintering machine head end, and length accounts for 45% ~ 55% of flue collector total length.Oxidation catalyst filter formula deduster 82 on concentrated phase flue collector 42, operating temperature maintains 150 DEG C ~ 250 DEG C, and filtration velocity is 0.3 ~ 0.8m/s.
As shown in Figure 4, the filter bag of oxidation catalyst filter formula deduster 81,82 is oxidation catalyst filter formula filter bag, comprise the inner substrate 802 of surface coating 801 and load catalyst fines, dedusting function is realized by surface coating 801, be mixed with the clean flue gas of denitrfying agent simultaneously, under the catalyst action on base material 802 surface, and surface coating 801 can have micropore, and the average grain diameter of micropore is 0.8 ~ 1.2 μm.Base material 802 is made up of polytetrafluoroethylene (PTFE) or glass fibre, base material 802 surface is sticked to after catalyst fines mixes by a certain percentage, or be blocked in the seam of base material 802 hole, or load in base material 802 with salting liquid form, thorough degraded bioxin and nitrogen oxide, catalyst fines is the oxide powder of one or more elements of Ti, Vi, W, Mo, sticks to base material 802 surface by a certain percentage after mixing; Catalyst fines granularity is 200 ~ 300 orders, and according to the difference of pollutant levels in smoke treatment, filter bag load capacity is 200 ~ 300g/ ㎡.Ash-laden gas is according to flow direction flowing from left to right, Han bioxin 803 and dust granules 804 in flue gas, dust granules 804 is blocked when passing surface coating 801, and be mixed with the nitrogen oxide of denitrfying agent with bioxin 803 is through surface coating 801, at base material 802, place is thoroughly decomposed.Finally, clean flue gas 805, through filter bag, discharges oxidation catalyst filter formula deduster 81,82.
In the present invention, purification method comprises the following steps:
A, sinter fume is introduced concentrated phase flue collector and dilute phase flue collector respectively according to the difference of flue-gas temperature and pollutant levels, temperature and the higher flue gas of pollutant levels introduce concentrated phase flue collector, flue-gas temperature and the lower introducing dilute phase flue collector of pollutant levels;
B, to flue gas in dilute phase flue collector, and in concentrated phase flue collector and dilute phase flue collector, spray into desulfurizing agent and denitrfying agent all successively along flow of flue gas direction, the sulfur dioxide in flue gas and the abundant reaction desulfuration of desulfurizing agent;
The flue gas being mixed into denitrfying agent in c, concentrated phase flue collector and in dilute phase flue collector flows to two oxidation catalyst filter formula dedusters respectively under fan action, and the dust in flue gas is filtered on the filter bag surface of filtration dust catcher;
D, the flue gas of nitrogen oxide He bioxin being mixed with denitrfying agent enter filter bag inside through filter bag surface coating, and under the effect of filter bag internal accelerator, nitrogen oxide, Ji bioxin is thoroughly decomposed, realizes denitrating flue gas and Tuo bioxin;
Clean flue gas after f, after filtration formula deduster filter imports same flue collector under fan action, and discharges from chimney.
Detailed work steps of the present invention is as follows:
Raw materials for sintering evenly adds pallet by distributing device, under belt feeder effect, move to sintering machine tail 2 from sintering machine head end 1, complete sintering through low temperature presintering, middle temperature rise temperature sintering, soak three phases, wherein in the sintering stage, temperature can reach 800 ~ 1200 DEG C.After having sintered, in tail discharging, cool by entering ring air-cooler 5 after single roll crusher fragmentation.
A large amount of flue gas can be produced in sintering process, after sinter bed, discharge from bellows 3.The pollutants such as a large amount of dust produced in sintering process, sulfur dioxide, nitrogen oxide, bioxin are discharged with flue gas, wherein, the pollutant levels that high-temperature flue gas produces are high, gather to concentrated phase flue collector 42 through bellows under blower fan 10 acts on, the pollutant levels that low-temperature flue gas produces are lower, gather to dilute phase flue collector 41 under blower fan 10 acts on through bellows.
In the present embodiment, high-temperature flue gas Zhong bioxin concentration is 0.5 ~ 2.0ngTEQ/Nm
3, nitrous oxides concentration is 300 ~ 500mg/m
3, sulfur dioxide concentration is 1000 ~ 2000mg/Nm
3, dust concentration is 10 ~ 15g/Nm
3.
Low-temperature flue gas Zhong bioxin concentration is 0.5 ~ 1.0ngTEQ/Nm
3, nitrous oxides concentration is 300 ~ 400mg/m
3, sulfur dioxide concentration is 1000 ~ 2000mg/Nm
3, dust concentration is 10 ~ 15g/Nm
3.
Ring air-cooler 5 exhaust gas volumn 300,000 ~ 400,000 Nm
3/ h, concentrated phase flue collector 42 flue gas flow 500,000 ~ 550,000 Nm
3/ h, flue-gas temperature 200 DEG C ~ 300 DEG C, dilute phase flue collector 41 flue gas flow 450,000 ~ 500,000 Nm
3/ h, flue-gas temperature 100 DEG C ~ 130 DEG C.
The flue gas of dilute phase flue collector 41 moves at blower fan 10 flows by action, and desulfurizing agent 6 sprays in flue by desulfurization injection apparatus 61, realizes flue gas desulfurization.Then export with ring air-cooler 5 after high-temp waste gas mixes and heat up, flow to oxidation catalyst filter formula deduster 81.Before this, denitrfying agent 7 sprays in flue by denitration injection apparatus 71, the high-temperature flue gas being mixed with denitrfying agent flows through oxidation catalyst filter formula deduster 81, on the surface of catalysis filter bag, dust in flue gas is filtered, flue gas after preliminary filtration flows through catalysis filter bag basic unit, and under the effect of catalyst herein, nitrogen oxide, bioxin is thoroughly decomposed.
The high-temperature flue gas of concentrated phase flue collector 42 flows to oxidation catalyst filter formula deduster 82 under fan action.Before this, desulfurizing agent 6 and denitrfying agent 7 spray in flue by desulfurization injection apparatus 62 and denitration injection apparatus 72, the high-temperature flue gas being finally mixed with denitrfying agent is purified at oxidation catalyst filter formula deduster 82 place, on the surface of catalysis filter bag, dust in flue gas is filtered, flue gas after preliminary filtration flows through catalysis filter bag basic unit, and under the effect of catalyst herein, nitrogen oxide, bioxin is thoroughly decomposed.
Concentrated phase flue collector 42 flue gas after purification and dilute phase flue collector 41 flue gas converge to flue collector 9, under blower fan 10 acts on, enter exhaust chimney 11.
Embodiment 2
As shown in Figure 2, in this example, raw materials for sintering evenly adds pallet by distributing device, under belt feeder effect, sintering machine tail 2 is moved to from sintering machine head end 1, sintering is completed through low temperature presintering, middle temperature rise temperature sintering, soak three phases, wherein in the sintering stage, temperature can reach 800 ~ 1200 DEG C.
A large amount of flue gas can be produced in sintering process, after sinter bed, discharge from bellows 3.The pollutants such as a large amount of dust produced in sintering process, sulfur dioxide, nitrogen oxide, bioxin are discharged with flue gas, wherein, the pollutant levels that high-temperature flue gas produces are high, gather to concentrated phase flue collector 42 through bellows under blower fan 10 acts on, the pollutant levels that low-temperature flue gas produces are lower, gather to dilute phase flue collector 41 under blower fan 10 acts on through bellows.
In the present embodiment, high-temperature flue gas Zhong bioxin concentration is 0.5 ~ 2.0ngTEQ/Nm
3, nitrous oxides concentration is 300 ~ 500mg/m
3, sulfur dioxide concentration is 1000 ~ 2000mg/Nm
3, dust concentration is 10 ~ 15g/Nm
3.
In the present embodiment, low-temperature flue gas Zhong bioxin concentration is 0.5 ~ 1.0ngTEQ/Nm
3, nitrous oxides concentration is 300 ~ 400mg/m
3, sulfur dioxide concentration is 1000 ~ 2000mg/Nm
3, dust concentration is 10 ~ 15g/Nm
3.
Ring air-cooler 5 exhaust gas volumn 300,000 ~ 400,000 Nm
3/ h, concentrated phase flue collector 42 flue gas flow 500,000 ~ 550,000 Nm
3/ h, flue-gas temperature 200 DEG C ~ 300 DEG C, dilute phase flue collector 41 flue gas flow 450,000 ~ 500,000 Nm
3/ h, flue-gas temperature 100 DEG C ~ 130 DEG C.
The flue gas of dilute phase flue collector 41 is in fan action current downflow, and desulfurizing agent 6 sprays in flue by desulfurization injection apparatus 61, realizes flue gas desulfurization.Then under jet chimney companion heat, the high-temperature flue gas of about 200 DEG C is progressively warming up to, flue gas flow direction oxidation catalyst filter formula deduster 81.Before this, denitrfying agent 7 sprays in flue by denitration injection apparatus 71, the high-temperature flue gas being mixed with denitrfying agent flows through oxidation catalyst filter formula deduster 81, on the surface of catalysis filter bag, dust in flue gas is filtered, flue gas after preliminary filtration flows through catalysis filter bag basic unit, and under the effect of catalyst herein, nitrogen oxide, bioxin is thoroughly decomposed.
The high-temperature flue gas of concentrated phase flue collector 42 at blower fan 10 flows by action to oxidation catalyst filter formula deduster 82.Before this, desulfurizing agent 6 and denitrfying agent 7 spray in flue by desulfurization injection apparatus 62 and denitration injection apparatus 72, the high-temperature flue gas being finally mixed with denitrfying agent is purified at oxidation catalyst filter formula deduster 82 place, on the surface of catalysis filter bag, dust in flue gas is filtered, flue gas after preliminary filtration flows through catalysis filter bag basic unit, and under the effect of catalyst herein, nitrogen oxide, bioxin is thoroughly decomposed.
Concentrated phase flue collector 42 flue gas after purification and dilute phase flue collector 41 flue gas converge to flue collector 9, under blower fan 10 acts on, enter chimney 11.
Embodiment 3
As shown in Figure 3, raw materials for sintering evenly adds pallet by distributing device, under belt feeder effect, sintering machine tail 2 is moved to from sintering machine head end 1, complete sintering through low temperature presintering, middle temperature rise temperature sintering, soak three phases, wherein in the sintering stage, temperature can reach 800 ~ 1200 DEG C.After having sintered, in tail discharging, cool by entering ring air-cooler 5 after single roll crusher fragmentation, ring air-cooler 5 waste gas is discharged under air-introduced machine 53 acts on.
A large amount of flue gas can be produced in sintering process, after sinter bed, discharge from bellows 3.The pollutants such as a large amount of dust produced in sintering process, sulfur dioxide, nitrogen oxide, bioxin are discharged with flue gas, wherein, the pollutant levels that high-temperature flue gas produces are high, gather to concentrated phase flue collector 42 through bellows under blower fan 10 acts on, the pollutant levels that low-temperature flue gas produces are lower, gather to dilute phase flue collector 41 under blower fan 10 acts on through bellows.
In the present embodiment, high-temperature flue gas Zhong bioxin concentration is 0.5 ~ 2.0ngTEQ/Nm
3, nitrous oxides concentration is 300 ~ 500mg/m
3, sulfur dioxide concentration is 1000 ~ 2000mg/Nm
3, dust concentration is 10 ~ 15g/Nm
3.
In the present embodiment, low-temperature flue gas Zhong bioxin concentration is 0.2 ~ 0.5ngTEQ/Nm
3, nitrous oxides concentration is 0 ~ 300mg/m
3, sulfur dioxide concentration is 1000 ~ 2000mg/Nm
3, dust concentration is 10 ~ 15g/Nm
3.
Ring air-cooler 5 exhaust gas volumn 300,000 ~ 400,000 Nm
3/ h, concentrated phase flue collector 42 flue gas flow 500,000 ~ 550,000 Nm
3/ h, flue-gas temperature 200 DEG C ~ 300 DEG C, dilute phase flue collector 41 flue gas flow 450,000 ~ 500,000 Nm
3/ h, flue-gas temperature 100 DEG C ~ 130 DEG C.
The flue gas of dilute phase flue collector 41 moves at blower fan 10 flows by action, exports after high-temp waste gas mixes and heat up, flow to filtration dust catcher 83 with ring air-cooler 5.Before this, desulfurizing agent 6 is sprayed in flue by desulfurization injection apparatus 61 and realizes flue gas desulfurization, and the flue gas after desulfurization is purified at filtration dust catcher 83 place, and exiting flue gas dust concentration is lower than 30mg/Nm
3, sulfur dioxide concentration is lower than 200mg/Nm
3.Because the bioxin of dilute phase flue collector 41 flue gas in this example, nitrogen oxide isoconcentration are lower, need not heat and can decompose completely with catalysis, therefore eliminate catalysis link and heating link.
The high-temperature flue gas of concentrated phase flue collector 42 at blower fan 10 flows by action to oxidation catalyst filter formula deduster 82.Before this, desulfurizing agent 6 and denitrfying agent 7 spray in flue by desulfurization injection apparatus 62 and denitration injection apparatus 72, the high-temperature flue gas being finally mixed with denitrfying agent 7 is purified at oxidation catalyst filter formula deduster 82 place, under the effect of catalysis filter bag, dust in flue gas is filtered, and nitrogen oxide, bioxin is thoroughly decomposed simultaneously.Concentrated phase flue collector 42 flue gas after purification and dilute phase flue collector 41 flue gas converge to flue collector 9, under blower fan 10 acts on, enter exhaust chimney 11.
Structure of the present invention is simple, and flow process is reasonable, stable and reliable operation, non-secondary pollution, can effectively to the dust in sinter fume, sulfur dioxide, nitrogen oxide Ji bioxin purifies simultaneously, by this system, ensure purification after discharge flue gas in particle concentration≤20mg/Nm
3, sulfur dioxide concentration≤20mg/Nm
3, nitrous oxides concentration≤300mg/Nm
3， bioxin concentration is at 0 ~ 0.5ng-TEQ/Nm
3, discharge standard is lower than existing national standard.
Any person skilled in the art scholar all under the spirit and category of invention, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that invention discloses, must be contained by the claim of inventing.
Claims (8)
1. a sinter fume multi-pollutant synergistic purification method, is characterized in that, comprise the following steps:
A, sinter fume is introduced concentrated phase flue collector and dilute phase flue collector respectively according to the difference of flue-gas temperature and pollutant levels, in concentrated phase flue collector, flue-gas temperature and pollutant levels are all higher than dilute phase flue collector;
B, to flue gas in dilute phase flue collector, and in concentrated phase flue collector and dilute phase flue collector, spray into desulfurizing agent and denitrfying agent all successively along flow of flue gas direction, the sulfur dioxide in flue gas and the abundant reaction desulfuration of desulfurizing agent;
C, be mixed into denitrfying agent flue gas in fan action current downflow to filtration dust catcher, the dust in flue gas is filtered on the filter bag surface of filtration dust catcher;
D, the flue gas of nitrogen oxide He bioxin being mixed with denitrfying agent enter filter bag inside through filter bag surface coating, and under the effect of filter bag internal accelerator, nitrogen oxide, Ji bioxin is thoroughly decomposed, realizes denitrating flue gas and Tuo bioxin;
Clean flue gas after f, after filtration formula deduster filter, under fan action, is discharged from chimney.
2. a kind of sinter fume multi-pollutant synergistic purification method according to claim 1, is characterized in that: in described step b, is communicated with, the outlet of ring air-cooler by ring air-cooler outlet exhaust to flue gas with dilute phase flue collector; Or heated by jet chimney companion heat.
3. a kind of sinter fume multi-pollutant synergistic purification method according to claim 1 and 2, it is characterized in that: in described steps d, filtration dust catcher on concentrated phase flue collector is oxidation catalyst filter formula deduster, its internal reaction temperature maintains 150 ~ 250 DEG C, and filtration velocity is 0.3 ~ 0.8m/s.
4. a kind of sinter fume multi-pollutant synergistic purification method according to claim 3, is characterized in that: the filter bag of described oxidation catalyst filter formula deduster is oxidation catalyst filter formula filter bag, comprises surface coating and the load inner substrate of catalyst fines; Described catalyst fines is the mixture of the oxide powder of Ti, Vi, W, Mo, and this catalyst fines granularity is 200 ~ 300 orders, and filter bag load capacity is 200 ~ 300g/m
2.
5. a kind of sinter fume multi-pollutant synergistic purification method according to claim 1, it is characterized in that: in described concentrated phase flue collector, temperature is 200 ~ 300 DEG C, in dilute phase flue collector, temperature is 50 ~ 100 DEG C, in concentrated phase flue collector, flue gas bioxin and nitrous oxides concentration are higher than the flue gas of dilute phase flue collector, described dilute phase flue collector position is from the flue collector closing on sintering machine head end, and length accounts for 45% ~ 55% of flue collector total length.
6. a kind of sinter fume multi-pollutant synergistic purification method according to claim 1, is characterized in that: the filtration dust catcher on described dilute phase flue collector is gating thorn felt filter material deduster, and operating temperature is lower than 110 DEG C, and filtration velocity is 1.0 ~ 1.1m/s; Or the filtration dust catcher on described dilute phase flue collector is oxidation catalyst filter formula deduster.
7. a sinter fume multi-pollutant cooperated purification system, it is characterized in that: comprise smoke eliminator and Smoke-heating device, described smoke eliminator comprises the flue collector for being tightly connected with sintering machine, flue collector is disposed with desulfurizing agent injection apparatus, denitrfying agent injection apparatus, filtration dust catcher and exhaust apparatus along flue gas discharge direction, described Smoke-heating device is positioned at filtration dust catcher front, heats the flue gas of flue collector internal filtering type deduster upstream.
8. a kind of sinter fume multi-pollutant cooperated purification system according to claim 7, it is characterized in that: described flue collector is divided into concentrated phase flue collector, dilute phase flue collector by flue-gas temperature, concentrated phase flue collector and dilute phase flue collector are spaced from each other, described concentrated phase flue collector and dilute phase flue collector are provided with desulfurizing agent injection apparatus, denitrfying agent injection apparatus and filtration dust catcher, and described concentrated phase flue collector is all connected with exhaust apparatus with dilute phase flue collector tail end.
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