CN105135895B - A kind of selective sintering flue gas segmented comprehensive processing technique - Google Patents

A kind of selective sintering flue gas segmented comprehensive processing technique Download PDF

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CN105135895B
CN105135895B CN201510466012.8A CN201510466012A CN105135895B CN 105135895 B CN105135895 B CN 105135895B CN 201510466012 A CN201510466012 A CN 201510466012A CN 105135895 B CN105135895 B CN 105135895B
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flue gas
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flue
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CN105135895A (en
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郑琨
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Anqing Muer Environmental Protection Technology Co.,Ltd.
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郑琨
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Abstract

A kind of selective sintering flue gas segmented comprehensive processing technique, belongs to energy-conserving and environment-protective technical fiel.Will sintering head part S O2The igniting section flue gas that concentration is higher, NOx concentration is relatively low carries out flue gas recirculation sintering;Will sintering middle part SO2It is outer after the higher flue gas ash removal of concentration, desulfurization to arrange;Will sintering middle part SO2It is outer after concentration, NOx concentration all low flue gas ash removals to arrange;By sintering machine afterbody SO2Mixed after concentration is relatively low, NOx concentration is higher flue gas ash removal, denitration with cooler high temperature section flue gas and carry out waste heat recovery, it is recovered after heat smoke carry out hot air circulation sintering;The steam that waste heat recovery is produced can cogeneration or vapour drag driving main exhauster of sintering.The present invention realizes sintering flue gas segmentation desulphurization denitration and reduces smoke discharge amount, improves flue gas heat recovery efficiency, overall reduction construction investment and production run cost, meets the operational mode of energy-saving and environmental protection, emission reduction, consumption reduction, synergy and recycling economy.

Description

A kind of selective sintering flue gas segmented comprehensive processing technique
Technical field
The invention belongs to the energy-conserving and environment-protective of iron and steel metallurgical industry sintering production process, emission reduction consumption-reducing technological field, it is related to one Plant the segmented comprehensive processing technique of sintering flue gas desulfurization denitration and fume afterheat cascade utilization, and in particular to a kind of selective The comprehensive processing technique of flue gas segmented desulphurization denitration, hot air circulation sintering and flue gas heat recovery is sintered, is more specifically related to And it is a kind of based on SO under flue gas different temperatures2、NOx、COxA kind of selective sintering flue gas segmented of concentration distribution feature is comprehensive Close handling process.
Background technology
Steel and iron industry is energy consumption rich and influential family, is also heavy polluter, and sintering circuit is discharge air pollutants in steel and iron industry One of primary pollution source, especially SO2And NOxMaximum generating source, 51%~62% SO is there are about in steel smelting procedure2And 48% NOxFrom sintering circuit.In Ore Sintering Process, the sulphur brought into by crude fuel is oxidized to gas in high-temperature sintering process The SO of state2, and the nitrogen oxides brought into by fuel is oxidized to gaseous NO in high-temperature sintering processx.In different sintering zones Section, with material temperature constantly raise and sintering atmosphere in O2And COxSO in the change of concentration, sintering flue gas2And NOxConcentration is also produced Raw corresponding change.
Sintering type smoke pollutant removal technology is many at present, but is the end treatment technique for Single Pollution thing mostly, Such as sintering flue gas ash removal, desulfurization.Because sintering exhaust gas volumn is big, and SO2、NOxIt is relatively low etc. pollutant concentration, cause burning at present Construction and the production run cost for tying fume treatment facility are all very high, and efficiency is relatively low.As China's air environment protection emission refers to Mark requires more and more tighter, and requires that sintering flue gas not only wants desulfurization also to want denitration in steel " 13 " planning.Burn at present Knot flue gas desulfurization has started to enforce, and main to take off processing entirely using sintering exhanst gas outlet, flue gas desulfurization can be divided into wet method, dry method And the several ways such as semidry method, all kinds of technique removal effects are integrally general;Denitrating flue gas substantially has SNCR, SCR and catalysis oxidation Etc. several ways, SCR method comparative maturities are feasible, but the example of domestic operation of not going into operation also at present, and main cause is sintering cigarette Gas outlet temperature is relatively low can not to realize directly complete de- processing, and flue gas must be heated to reaction temperature in advance, so increase again Build and production run cost.
With the continuous decline of the successive optimization and process energy consumption of steel and iron industry production procedure, each production process is recycled Residual heat and energy turn into one of maximally effective approach of iron and steel enterprise's energy-saving and emission-reduction.Sintering circuit energy consumption accounts for iron and steel enterprise's total energy consumption 10%~15%, be only second to Iron-smelting.The average energy consumption of China's sintering circuit sintering deposit per ton is more advanced than foreign countries at present refers to Absolute altitude goes out 20% or so, and its one of the main reasons is waste heat recovery and, current China sintering circuit waste heat profit relatively low using level With rate also less than 30%, therefore high efficiente callback is reduction using waste heat resources in sintering process and raising sintering waste heat recovery utilization rate One of Main way and approach of sintering circuit energy consumption.
Mainly there is two large divisions in sintering process waste heat recovery source:1. it is about in the heat smoke temperature of cooler high temperature section 350 DEG C~420 DEG C, this part sensible heat accounts for the 29.3% of total amount of heat, in recent years, sinter cooler heat smoke heat recovery technology (waste heat producing steam to generate electricity or vapour traction move main exhauster of sintering) be widely used popularization;2. it is high in sintering machine tail bellows The flue-gas temperature of temperature section discharge is 320 DEG C~400 DEG C, and this part sensible heat accounts for the 23.6% of total amount of heat, sintering machine tail high temperature cigarette Gas heat recovery technology is in the stage of fumbling, is currently used primarily in hot gas sintering technique, and waste heat producing steam technology is not pushed away also Wide application.Two large divisions's waste heat of sintering process is also that single recovery is utilized at present, from realizing the efficient of energy cascade utilization Property and economy point analysis, be the development that improves effective UTILIZATION OF VESIDUAL HEAT IN to greatest extent by the processing application of two large divisions's residual heat integrative Direction.
In summary, the sintering control of flue gas pollutant at present, belonging to function single end science and engineering removal methods more Skill, with increasing for pollutant limiting emission species, end-o f-pipe -control process facility can only be more and more, and occupation of land is increasing, makes Constantly risen into construction investment and operating cost;The waste heat of sintering circuit is also the recycling at single position, is equally caused Equipment investment operation, place occupancy etc. are many to be wasted.Accordingly, it would be desirable to according to the cigarette in sintering process flow and production process Gas feature, develops more economical, efficient energy-conserving and environment-protective, emission reduction consumption reduction technology.
The content of the invention
In view of above-mentioned problems, the present invention have studied in Ore Sintering Process, in different sintering sections, with sintering O in atmosphere2SO in the change of concentration, sintering flue gas2、NOxAnd COxConcentration corresponding change produced by constantly being raised with material temperature, And consider be classified sintering machine tail flue gas, the high warm flue gas waste heat of part cooler, recycle, and then realize sintering cigarette The whole energy environmental protection of gas, emission reduction consumption reduction technique.
Therefore, it is an object of the invention to provide a kind of selective sintering flue gas segmented comprehensive processing technique, the work Skill is by sintering flue gas segmentation desulphurization denitration Processing tecchnics and sintering flue gas recirculation production technology and fume afterheat synthetical recovery profit Sintering flue gas desulfurization denitration, emission reduction and the comprehensive processing technique for improving heat recovery rate organically combined with technique, This technique integrally reduces construction investment and production run cost, meets operating Mode of Circular Economy.
To achieve these goals, the present invention is adopted the following technical scheme that:
A kind of selective sintering flue gas segmented comprehensive processing technique, according to sintering flue gas SO in sintering process2、NOx、 COxConcentration is with O in flue gas2The Variation Features of concentration, flue-gas temperature, are divided into four by sintering machine wind box along chassis traffic direction Cooler high temperature section region totally five regions are added in region simultaneously, are described as follows:
1. (sintering machine head ignition zone, 110~120 DEG C of flue wind-warm syndrome), one's respective area is sintered in flue gas in region SO2, CO concentration it is higher, NOxConcentration is very low;
2. (smoke directly ventilating region, 100~110 DEG C of flue wind-warm syndrome in the middle part of sintering machine), one's respective area sinters flue gas in region Middle SO2、NOxConcentration is very low, simultaneously because 4. region is led into one's respective area with after the heat of mixing flue gas heat recovery 5. of region Hot air circulation sintering is carried out, on the one hand makes full use of the physical sensible heat of flue gas to improve fuel availability, reduces sintering solid burnup; On the other hand utilize base mix band in sinter bed, cross wet bands to SO2Strong adsorption effect, while can also using burn Calcium ferrite is to NO in ramming material layerxSelf catalyzed reduction effect, SO in the synchronous in line flue gas of reduction2、NOxConcentration;
3. (flue gas desulfurization region, 120~180 DEG C of flue wind-warm syndrome in the middle part of sintering machine), one's respective area sinters flue gas in region Middle SO2It is dense, NOxConcentration is relatively low, simultaneously because 1. flue gas leads to one's respective area progress flue gas recirculation sintering, a side by region Face is by SO in region 1. flue gas2With SO in the flue gas of one's respective area2Collect, realize SO2Flue gas desulfurization is carried out after enrichment;Another aspect area 1. CO concentration in flue gas is higher in domain, can continue with sinter bed calcium ferrite to NOxSelf catalyzed reduction effect, further Reduce NO in desulfurization fumexConcentration;
4. (sintering machine afterbody denitrating flue gas region, 320~400 DEG C of flue wind-warm syndrome), one's respective area sinters flue gas in region Middle NOx、O2Content concn is very high, SO2、COxConcentration is very low, and flue-gas temperature can carry out SCR denitrating flue gas more than 320 DEG C. 5. the mixed flue gas of flue gas (referred to as mixing heat smoke, temperature is at 340 DEG C~380 DEG C) introduces cigarette to heat smoke with region after denitration Region, which is led to, after gas heat recovery facility heat exchange 2. carries out hot air circulation sintering.
Region 5. (cooler high-temperature flue gas region, 350 DEG C~420 DEG C of heat smoke temperature), O in the flue gas of one's respective area2Content The O close in air2Contents level, thus one's respective area flue gas can with region 4. flue gas after SCR denitration be mixed to form it is mixed Heat smoke is closed, 2. lead to region after heat recovery facility heat exchange carries out hot air circulation sintering.
1. scope includes several bellows of sintering machine head non-coated igniter regions in the region, and bellows flue gas is pooled to head cigarette Region is led to through head multi-tube dust cleaner, head circulating fan 3. carry out flue gas recirculation sintering after feed channel;
2. scope includes preceding several bellows in the middle part of sintering machine in the region, and bellows flue gas is passed through after being pooled in line flue Sintering electric cleaner, main exhauster of sintering lead to the main chimney of sintering and directly discharged;
3. scope includes several bellows behind sintering machine middle part in the region, and bellows flue gas is passed through after being pooled to desulfurization fume pipeline Electric cleaner, sintering flue gas desulfurization facility, desulphurization devices are led to after in line flue collects by main smoke stack emission;
The process choice of the sintering flue gas desulfurization facility visually sinters field condition and actual production situation, from wet The modes such as method, semidry method, conventional process such as ammonia process, magnesium processes, calcium method, lime stone-gypsum method, SDA rotary spraying techniques etc..
4. scope includes the several bellows in sintering machine afterbody sintering end point region in the region, and bellows flue gas is pooled to denitration cigarette Converged after feed channel after tail multi-tube dust cleaner, sintering denitrating flue gas facility (SCR), denitration booster fan with the flue gas of region 5. Followed after collecting waste heat recovery flue formation mixing heat smoke, the sintered flue gas heat recovery facility of the flue gas by tail Ring blower fan leads to region through tail circulating flue gas pipeline and 2. carries out hot air circulation sintering.
5. scope includes cooler high temperature section heat smoke, the sintering circular cooler generally used at present (letter in the region Claiming central cooler) high temperature section can use cold section of central cooler one and part secondary cooling zone heat smoke, and high warm flue gas is pooled to region 4. remaining After recuperation of heat flue through sinter flue gas heat recovery facility after by tail circulating fan through tail circulating flue gas pipeline Lead to region and 2. carry out hot air circulation sintering.
The sintering flue gas heat recovery facility steams comprising the production of a whole set of waste heat such as waste heat boiler, drum, oxygen-eliminating device Vapour facility, according to sintering field condition and actual production situation, may be selected the steaming that different size waste heat boiler produces various criterion Vapour.According to prior art, can produce saturated vapor is used to sinter the compound in second drum mixer and sintering machine head mixed-hopper Steam preheating, can also produce superheated steam and deliver to power generating equipment progress cogeneration (this technology is in a wide range of popularization stage), also Steam can be directed directly to the vapour dragging device in main exhauster of sintering room, main exhauster of sintering is dragged by electricity be transformed into vapour drag or vapour- Electricity is mixed to be dragged (technology is in small range and promotes the stage, can directly save the huge power consumption of main exhauster of sintering).
The Process configuration of the present invention is compared with conventional sintering process is configured, and the sintering main equipment such as sintering machine and igniter is matched somebody with somebody Put identical, the main distinction is the Process configuration for sintering flue gas system.Had the following advantages that compared with traditional handicraft:
1. sintering circuit reduces outer heat extraction exhaust gas volumn 23.6% or so, corresponding sintering electric cleaner and main exhauster of sintering Configure model to reduce, reduce main exhauster of sintering power 23.8%, reduce construction investment and production run cost;
2. the exhaust gas volumn handled during flue gas desulfurization and denitrification reduces SO in 40%~60% or so, desulfurization section flue gas2Concentration and NO in denitration section flue gasxConcentration improves 50% or so, and desulfurization off sulfide effect can improve 4% or so, sintering flue gas desulfurization denitration dress 40% or so can be reduced by putting equipment investment and operating cost;
3. hot air circulation sintering can make Sintering Yield improve 2%, tumbler index improves 1.5%, and yield rate improves 2%, Gas burnup reduction by 12%~15%, solid burnup reduction by 2%~4%;
4. heat of mixing fume afterheat producing steam is used for the relatively conventional central cooler heat smoke cogeneration sintering deposit per ton that generates electricity 5kWh can be issued additional;Afterheat steam drags main exhauster of sintering to save power consumption 25kWh equivalent to sintering deposit per ton for vapour, therefore produces Economic benefit it is considerable.
The present invention is realized sintering flue gas segmentation desulphurization denitration Processing tecchnics and sintering production flue gas recirculation technique and cigarette What gas residual heat integrative recycling technique was organically combined sinters fume environment protection, emission reduction, energy-conservation, consumption reduction, the General Office of synergy Science and engineering skill, overall reduction investment and operation cost, increase economic efficiency, meet operating Mode of Circular Economy.
Brief description of the drawings
Fig. 1 is the process flow diagram of the specific embodiment of the invention 1.
Marked in figure as follows:
1- sintering machines;2- ignition furnaces;3- hot air circulation covers;4- flue gas recirculation covers;5- head multi-tube dust cleaners;6- heads are followed Ring blower fan;7- sinters electric cleaner;8- main exhauster of sintering;9- desulfurization electric cleaners;10- sintering flue gas desulfurization facilities;11- takes off Sulphur booster fan;12- tail multi-tube dust cleaners;13- sintering denitrating flue gas facilities (SCR);14- denitration booster fans;15- tails Circulating fan;16- heat smoke mixing bellows;17- sinters flue gas heat recovery facility;18- sinter coolers (central cooler); 19- cooler high temperature section petticoat pipes;20- sinters main chimney;1. (sintering machine head ignition zone includes No.1~No.3 in 21- regions Bellows);22- regions are 2. (smoke directly ventilating region includes No.4~No.11 bellows in the middle part of sintering machine);23- regions are 3. (in sintering machine Portion flue gas desulfurization region includes No.12~No.19 bellows);4. (sintering machine afterbody denitrating flue gas region includes No.20 in 24- regions ~No.22 bellows);5. (cooler high-temperature flue gas region includes cold section of central cooler one and part secondary cooling zone heat smoke cigarette in 25- regions Cover).
Fig. 2 is the sintering machine wind box flue gas inspection wind-warm syndrome table of instantiation 1 of the present invention.
Embodiment
With reference to the accompanying drawings and examples to the present invention embodiment be described further, but not as Limit.
As shown in figure 1, the system includes sintering machine 1, region 1. 21, region 2. 22, region 3. 23, region 4. 24;Institute State after the bellows connection head multi-tube dust cleaner 5 of region 1. again respectively with head circulating fan 6 and the flue gas recirculation cover of sintering machine 1 4 connections;After the bellows connection sintering electric cleaner 7 of the region 2. again respectively with main exhauster of sintering 8 and the main chimney 20 of sintering Connection;It is pressurized respectively with sintering flue gas desulfurization facility 10 and desulfurization again after the bellows connection desulfurization electric cleaner 9 of the region 3. Blower fan 11 and the main chimney 20 of sintering are connected;Again respectively with sintering cigarette after the bellows connection tail multi-tube dust cleaner 12 of the region 4. Qi exhaustion nitre facility (SCR) 13 and denitration booster fan 14, heat smoke mixing bellows 16, sintering flue gas heat recovery facility 17th, the hot air circulation cover 3 of tail circulating fan 18 and sintering machine 1 is connected;The heat in the region 5. cooler high-temperature flue gas region Again respectively with sintering flue gas heat recovery facility 17, tail circulating fan after smoke hood connection heat smoke mixing bellows 16 18 and the hot air circulation cover 3 of sintering machine 1 connect;
Embodiment:
With certain 210m2Exemplified by sintering machine, selective sintering flue gas segmented comprehensive processing technique a kind of to the present invention Describe in detail as follows:
As shown in figure 1, in a 210m2On sintering machine 1, by the region 1. sintering machine head ignition zone No.1~ No.3 bellows sintering flue gas is pooled to after head flue through head multi-tube dust cleaner 5 leads to sintering by head circulating fan 6 The flue gas recirculation cover 4 of machine 1 carries out flue gas recirculation sintering;By the region 2. in the middle part of sintering machine smoke directly ventilating region No.4~ No.11 bellows sintering flue gas, which is pooled to after in line flue to be led to by main exhauster of sintering 8 through sintering electric cleaner 7, sinters master Chimney 20 is directly discharged;No.12~No.19 bellows sintering flue gas in flue gas desulfurization region in the middle part of the region 3. sintering machine is converged Collect after entering the progress flue gas desulfurization processing of sintering flue gas desulfurization facility 10 through desulfurization electric cleaner 9 after desulfurization fume pipeline by taking off Sulphur booster fan 11 leads to after in line flue collects and discharged by sintering main chimney 20;By the region 4. sintering machine afterbody cigarette No.20~No.22 bellows sintering flue gas in qi exhaustion nitre region is pooled to after denitration flue to enter through tail multi-tube dust cleaner 12 Enter to sinter after denitrating flue gas facility (SCR) 13 carries out denitrating flue gas processing and heat smoke mixing bellows are led to by denitration booster fan 14 16 and the flue gas of region 5. collect to form mixing heat smoke, by tail after the sintered flue gas heat recovery facility 17 of the flue gas The hot air circulation cover 3 that circulating fan 18 leads to sintering machine 1 through tail circulating flue gas pipeline carries out hot air circulation sintering;By the area The hot cigarette of cooler high temperature section in domain 5. cooler high-temperature flue gas region (cold section of central cooler one and part secondary cooling zone heat smoke petticoat pipe) Gas is pooled to the heat smoke after denitrating flue gas of heat smoke mixing bellows 16 and region 4. and collects to form mixing heat smoke, the cigarette After the sintered flue gas heat recovery facility 17 of gas sintering machine 1 is led to by tail circulating fan 18 through tail circulating flue gas pipeline Hot air circulation cover 3 carry out hot air circulation sintering;
The embodiment can reduce outer heat extraction exhaust gas volumn 23.6% or so, corresponding sintering electric cleaner and main exhauster of sintering Configure model to reduce, reduce main exhauster of sintering power 23.8%;The exhaust gas volumn reduction 40% handled during flue gas desulfurization and denitrification~ 60% or so, SO in desulfurization section flue gas2NO in concentration and denitration section flue gasxConcentration improves 50% or so, and desulfurization off sulfide effect can be carried High by 4% or so, the equipment investment of sintering flue gas desulfurization denitrification apparatus and operating cost can reduce 40% or so;Sintering Yield can be made 2% is improved, tumbler index improves 1.5%, and yield rate improves 2%, gas burnup reduction by 12%~15%, solid burnup reduction 2%~4%;Relatively conventional central cooler heat smoke cogeneration sintering deposit per ton can issue additional 5kWh;Afterheat steam drags burning for vapour Tie main exhauster and save power consumption 25kWh equivalent to sintering deposit per ton.
Although being described in conjunction with the accompanying embodiments of the present invention, one of ordinary skill in the art can be described Various deformations or amendments are made in the range of claim.

Claims (7)

1. a kind of selective sintering flue gas segmented comprehensive processing technique, according to sintering flue gas SO in sintering process2、NOx、COx Concentration is with O in flue gas2The Variation Features of concentration, flue-gas temperature, are divided into four areas by sintering machine wind box along chassis traffic direction Domain, while adding cooler high temperature section region totally five regions:Region 1 is sintering machine head ignition zone, and scope includes burning Tie SO in several bellows of chain-drive section non-coated igniter regions, 110~120 DEG C of flue wind-warm syndrome, the sintering flue gas of region 12, CO concentration Higher, NOx concentration is very low, and this partial fume is carried out into flue gas recirculation sintering;Region 2 is smoke directly ventilating region in the middle part of sintering machine, SO in several bellows before scope is included in the middle part of sintering machine, 100~110 DEG C of flue wind-warm syndrome, the sintering flue gas of region 22, NOx it is dense Degree is very low, is arranged directly outer after this partial fume dedusting;Region 3 is flue gas desulfurization region in the middle part of sintering machine, and scope includes sintering SO in several bellows after in the middle part of machine, 120~180 DEG C of flue wind-warm syndrome, the sintering flue gas of region 32It is dense, NOx concentration compared with It is low, this partial fume is subjected to outer after desulfurization process arrange;Region 4 is sintering machine afterbody denitrating flue gas region, and scope includes sintering NOx, O in the several bellows in drive end unit sintering end point region, 320~400 DEG C of flue wind-warm syndrome, the sintering flue gas of region 42Content is dense Spend very high, SO2, COx concentration it is very low, this partial fume is carried out carrying out fume afterheat time after mix with the flue gas of region 5 after denitration Receive using and then carry out hot air circulation sintering again;Region 5 is cooler high-temperature flue gas region, and scope is useless including cooler high temperature section O in flue gas, 350 DEG C~420 DEG C of flue gas temperature, the cooler high-temperature flue gas of region 52Content O close in air2Contents level, will This partial fume carries out flue gas heat recovery and then carries out hot air circulation sintering again after being mixed with flue gas after the denitration of region 4.
2. technique as claimed in claim 1, it is characterised in that according to sintering flue gas SO in sintering process2, NOx, COx concentration with O in flue gas2The Variation Features of concentration, flue-gas temperature, are divided into four regions, to this by sintering machine wind box along chassis traffic direction The carry out flue gas desulfurization and denitrification of the sintering flue gas selectivity in four regions, flue gas recirculation sintering, flue gas hot gas sintering and with it is cold But machine high temperature section smoke comprehensive carries out the segment processing of heat recovery.
3. the technique as described in one of claim 1-2, it is characterised in that region 1 is sintered into flue gas after multi-tube dust cleaner dedusting Lead to region 3 and carry out flue gas recirculation sintering, and the flue gas of region 3 collects to realize SO2Enrichment, is sintered flue gas desulfurization processing and reaches It is outer after to national regulation requirement to arrange.
4. the technique as described in one of claim 1-2, it is characterised in that region 2 carries out hot air circulation sintering, on the one hand fully Fuel availability is improved using the physical sensible heat of flue gas, sintering solid burnup is reduced;On the other hand using original in sinter bed Compound band, wet bands excessively are to SO2Strong adsorption effect, while utilizing self catalyzed reduction of the calcium ferrite in sinter bed to NOx Effect, further reduces SO in line flue gas2, NOx concentration, sintering flue gas reach national regulation through head electric cleaner dedusting It is required that after outer arrange.
5. the technique as described in one of claim 1-2, it is characterised in that region 3 carries out flue gas recirculation sintering, on the one hand by area SO in the sintering flue gas of domain 12With SO in the flue gas of one's respective area2Collect, realize SO2Flue gas desulfurization processing is carried out after enrichment;On the other hand The CO concentration in flue gas of region 1 is higher, can continue with calcium ferrite in sinter bed and NOx self catalyzed reduction is acted on, enter one NOx concentration in step reduction desulfurization fume, makes sintering flue gas carry out flue gas desulfurization processing after electric cleaner dedusting and reaches country It is outer after code requirement to arrange.
6. the technique as described in one of claim 1-2, it is characterised in that the sintering flue gas of region 4 is laggard through multi-tube dust cleaner dedusting Heat smoke after the processing of row SCR denitrating flue gas is mixed to form with the cooler high-temperature waste flue gas of region 5 mixes heat smoke, introduces cigarette Region 2 is led to after gas heat recovery facility heat exchange and carries out O in hot air circulation sintering, circulating flue gas2Concentration is more than 18%.
7. the technique as described in one of claim 1-2, it is characterised in that the cooler high-temperature waste flue gas of region 5 are carried out with region 4 Heat smoke after denitrating flue gas processing is mixed to form mixing heat smoke, draws after introducing flue gas heat recovery facility heat exchange O in hot air circulation sintering, circulating flue gas is carried out to region 22Concentration is more than 18%.
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