CN105509491B - A kind of environmental protection and energy saving handling process for sintering flue gas - Google Patents

A kind of environmental protection and energy saving handling process for sintering flue gas Download PDF

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CN105509491B
CN105509491B CN201510894805.XA CN201510894805A CN105509491B CN 105509491 B CN105509491 B CN 105509491B CN 201510894805 A CN201510894805 A CN 201510894805A CN 105509491 B CN105509491 B CN 105509491B
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flue gas
sintering
region
heat
flue
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CN105509491A (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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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001Extraction of waste gases, collection of fumes and hoods used therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D49/00Separating dispersed particles from gases, air or vapours by other methods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/60Simultaneously removing sulfur oxides and nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8637Simultaneously removing sulfur oxides and nitrogen oxides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004Systems for reclaiming waste heat
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/50Carbon oxides
    • B01D2257/502Carbon monoxide
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A kind of environmental protection and energy saving handling process for sintering flue gas, belongs to energy-conserving and environment-protective technical fiel.Will sintering head part S O2Concentration is higher, NOx concentration very low 2 cold sections of section petticoat pipe heat smokes of flue gas removing dust and cooler carry out flue gas recirculation sintering after being mixed to form circulation heat smoke;Will sintering middle part SO2, carry out flue gas desulfurization after NOx concentration all high flue gas removing dusts, the flue gas after desulfurization, using being heated up again through piping afterburning after sintering, cooling high temperature flue gas pre-heating temperature elevation, reaches and outer after denitrating flue gas arrange is carried out after SCR denitration temperature requirement through flue gas heat-exchange unit;Will sintering afterbody SO2, NOx concentration all very low 1 cold section of petticoat pipe heat smokes of flue gas removing dust and cooler be mixed to form after high temperature mixed flue gas and carry out heat exchange through flue gas heat-exchange unit, the flue gas after heat exchange cooling is directly outer to be arranged;The present invention realizes sintering flue gas segmentation desulphurization denitration and reduces smoke discharge amount, utilize fume afterheat reduction denitration flue gas heating burnup, overall reduction construction investment and production run cost, meet the operational mode of energy-saving and environmental protection, emission reduction, consumption reduction, synergy and recycling economy.

Description

A kind of environmental protection and energy saving handling process for sintering flue gas
Technical field
The invention belongs to the environmental protection of iron and steel metallurgical industry sintering production process, field of energy-saving technology, it is related to a kind of sintering cigarette The environmental protection and energy saving handling process of gas, and in particular to a kind of desulphurization denitration of sintering flue gas, flue gas recirculation sintering and fume afterheat ladder The comprehensive processing technique that level is utilized, is more particularly to a kind of based on SO under flue gas different temperatures2、NOxConcentration distribution feature and flue gas Circulation, a kind of environmental protection and energy saving handling process of sintering flue gas of UTILIZATION OF VESIDUAL HEAT IN 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 sintering production process, the SO in different sintering section flue gases2And NOxConcentration and flue gas Temperature has corresponding relation.
Sintering type smoke pollutant removal technology is the end treatment technique for Single Pollution thing mostly at present, for example, sinter Flue gas ash removal, desulfurization etc..Because sintering exhaust gas volumn is big, and SO2、NOxIt is relatively low etc. pollutant concentration, cause to sinter at flue gas at present The investment construction and operation cost for managing facility are all very high, and efficiency is relatively low.As China's air environment protection emission index request is got over Come tighter, not only require that sintering flue gas desulfurization also wants denitration in steel " 13 " planning.Current sintering flue gas desulfurization has started to Enforce, it is main that processing is taken off using sintering exhanst gas outlet entirely, mainly there are the several ways such as wet method, dry method and semidry method;Flue gas Denitration substantially has the several ways such as SNCR, SCR and catalysis oxidation, and SCR method comparative maturities are feasible, but the country does not go into operation also at present The example of operation, if main cause is sintering flue gas exit temperature, relatively low directly complete de- processing must be heated to reaction in advance Temperature, so builds and operation cost is too high.
Cold section, the 2 cold sections petticoat pipe flue-gas temperatures of sinter cooler 1 are about 280 DEG C~420 DEG C, and this part sensible heat accounts for sintering The 37.3% of process total amount of heat, and the flue-gas temperature of sintering machine tail bellows high temperature section discharge is 320 DEG C~400 DEG C, this part shows Heat accounts for the 23.6% of sintering circuit total amount of heat, and this two large divisions's waste heat is also that single recovery producing steam is used at present, It is maximum limit by the processing application of two large divisions's residual heat integrative from high efficiency and the economy point analysis for realizing energy cascade utilization Degree improves the developing direction of effective UTILIZATION OF VESIDUAL HEAT IN.
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 operation cost;The waste heat of sintering circuit is also the recycling at single position, is equally caused Construction operation cost, 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 environmental protection and energy saving 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, flue gas is sintered Middle SO2、NOxConcentration corresponding change produced by constantly being raised with material temperature, and consider cold to sintering machine tail flue gas, cooler 1 Section, 2 cold sections of petticoat pipe fume afterheat classified utilizations, and then form the overall environmentally friendly energy saving technique of sintering flue gas.
Therefore, it is an object of the invention to provide a kind of environmental protection and energy saving handling process for sintering flue gas, the technique is to burn Knot flue gas segmentation desulphurization denitration Processing tecchnics are had with flue gas recirculation sintering production technique and fume afterheat cascade utilization technique The sintering fume environment protection energy-efficient treatment technique that machine is combined, this technique integrally reduces construction investment and production run cost, meets and follow Ring economic operation model.
To achieve these goals, the present invention is adopted the following technical scheme that:
A kind of environmental protection and energy saving handling process for sintering flue gas, according to sintering flue gas SO in sintering process2、NOxConcentration is with cigarette The Variation Features of temperature degree, by sintering machine wind box along chassis traffic direction be divided into four regions and meanwhile along with cold section of cooler 1, 2 cold sections of petticoat pipe regions totally six regions, 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, N0xConcentration is very low, and by one's respective area flue gas, 6. flue gas carries out being mixed to form circulation heat smoke with region, leads to Sintering device flue gas circulation cover carries out flue gas recirculation sintering.
2. (sintering machine central-fore area, 100~110 DEG C of flue wind-warm syndrome), one's respective area sinters SO in flue gas in region2、 NOxConcentration is all higher, simultaneously because the flue gas by region 1. with region 6., which is mixed to form circulation heat smoke, leads to one's respective area progress Flue gas recirculation is sintered, and is on the one hand utilized base mix band in sinter bed, is crossed wet bands to SO2Strong adsorption effect;It is another 1. CO concentration in flue gas is higher in aspect region, it is possible to use calcium ferrite is to NO in sinter bedxSelf catalyzed reduction effect, reach SO in flue gas is reduced simultaneously2、NOxConcentration.
3. (sintering machine postmedian region, 120~180 DEG C of flue wind-warm syndrome), one's respective area sinters SO in flue gas in region2、 NOxConcentration is all very high, simultaneously because the flue gas by region 1. with region 6., which is mixed to form circulation heat smoke, leads to one's respective area progress Flue gas recirculation is sintered, by SO in region 1. flue gas2、NOxWith SO in the flue gas of one's respective area2、NOxCollect, realize SO2、NOxEnrichment is laggard Row flue gas desulfurization and denitrification.
4. (sintering machine afterbody high-temperature flue gas region, 320~400 DEG C of flue wind-warm syndrome), one's respective area sinters flue gas in region Middle SO2、NOxConcentration is all very low, and flue-gas temperature forms high temperature mixed flue gas (temperature after 5. flue gas is mixed with region more than 320 DEG C 340 DEG C~380 DEG C of degree) introduce outer after flue gas heat-exchange unit heat exchange arrange.
5. (1 cold section of petticoat pipe of cooler, 350 DEG C~420 DEG C of flue-gas temperature), 4. flue gas enters one's respective area flue gas with region in region Row is mixed to form high temperature mixed flue gas, introduces outer after flue gas heat-exchange unit heat exchange arrange.
Region 6. (2 cold sections of petticoat pipes of cooler, 280 DEG C~320 DEG C of flue-gas temperature), O in the flue gas of one's respective area2The close sky of content O in gas2Contents level, by one's respective area flue gas, 1. flue gas carries out being mixed to form circulation heat smoke with region, leads to sintering device flue gas Circulation cover carries out flue gas recirculation sintering, makes full use of the physical sensible heat of this part flue gas to improve fuel availability, reduces sintering solid Body burnup.
1. scope includes the bellows of sintering machine head non-coated igniter regions in the region, and one's respective area flue gas is through head multi-tube dusting Device, circulating flue gas mixing bellows are led to by head flue gas blower fan.
2. scope includes the bellows of sintering machine middle front part in the region, and one's respective area flue gas and region are after 3. flue gas collects through burning Burning is led to after knot electric cleaner, main exhauster of sintering, sintering flue gas desulfurization facility, flue gas heat-exchange unit and the heating of flue afterburning Denitrating flue gas facility (SCR) is tied, then leading to the main chimney of sintering by discharged gas fume blower fan after flue gas heat-exchange unit cools again arranges Put.
3. scope includes the bellows of sintering machine postmedian in the region, and one's respective area flue gas and region are after 2. flue gas collects through burning Burning is led to after knot electric cleaner, main exhauster of sintering, sintering flue gas desulfurization facility, flue gas heat-exchange unit and the heating of flue afterburning Denitrating flue gas facility (SCR) is tied, then leading to the main chimney of sintering by discharged gas fume blower fan after flue gas heat-exchange unit cools again arranges Put.
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 bellows in sintering machine afterbody sintering end point region in the region, and one's respective area flue gas is removed through tail multitube Dirt device, leading to high-temperature flue gas mixing bellows and region by tail flue gas blower fan, 5. flue gas collects and forms high temperature mixed flue gas, the cigarette Gas by high-temperature flue gas blower fan lead to flue gas heat-exchange unit cooling after with region 2., the flue gas of region 3. collect, by discharged gas fume blower fan Lead to the main smoke stack emission of sintering.
5. scope includes 1 cold section of petticoat pipe flue gas of cooler, the sintering circular cooler generally used at present (letter in the region Claim central cooler) take 1 cold section of upper cover flue gas, 4. high-temperature flue gas collects to be formed in high-temperature flue gas mixing bellows for 1 cold section of flue gas and region High temperature mixed flue gas, the flue gas by high-temperature flue gas blower fan lead to after flue gas heat-exchange unit cools with region 2., region flue gas 3. converges Collection, the main smoke stack emission of sintering is led to by discharged gas fume blower fan.
6. scope includes 2 cold sections of petticoat pipe flue gases of cooler, the sintering circular cooler generally used at present (letter in the region Claim central cooler) 2 cold sections of upper cover flue gases are taken, 1. flue gas collects to form circulation 2 cold sections of flue gases in circulating flue gas mixing bellows with region Heat smoke, the flue gas leads to sintering device flue gas circulation cover by circulating flue gas blower fan and carries out flue gas recirculation 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 20% or so, sintering electric cleaner and main exhauster of sintering configuration model 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%~50% or so, desulphurization denitration section flue gas2、NOx Concentration improves 50% or so, and the investment of flue gas desulfurization and denitrification appliance arrangement and operation cost can reduce 40% or so;
3. flue gas hot gas 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. sintering circuit high temperature smoke pre-heating denitration flue gas is utilized to greatest extent, to reduce flue gas heating burnup, relatively Flue gas takes off the gas consumption reduction by more than 35% of technique heating entirely.
The present invention is realized sintering flue gas segmentation desulphurization denitration Processing tecchnics and flue gas recirculation, hot gas sintering technique and cigarette The exhaust heat stepped environmental protection organically combined using technique of gas, emission reduction, energy-conservation, consumption reduction, the comprehensive processing technique of synergy, overall drop Low investment and operation cost, increase economic efficiency, and 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- central coolers;3- coal gas;4- igniters;5- sintering device flue gas circulation cover;6- head multi-tube dustings Device;7- head flue gas blower fans;8- circulating flue gas mixing bellows;9- circulating flue gas blower fans;10- sinters electric cleaner;11- sintering masters Air exhauster;12- sintering flue gas desulfurization facilities;13- tail multi-tube dust cleaners;14- tail flue gas blower fans;15- high-temperature flue gas is mixed Bellows;16- high-temperature flue gas blower fans;17- flue gas heat-exchange units;18- pipeline afterburning heat risers;19- sinters denitrating flue gas facility (SCR);20- discharged gas fume blower fans;21- sinters main chimney;22- regions 1. (sintering machine head ignition zone comprising No.1~ No.3 bellows);23- regions are 2. (sintering machine middle front part fume treatment region includes No.4~No.11 bellows);3. (burn in 24- regions Knot machine postmedian fume treatment region includes No.12~No.19 bellows);4. (sintering machine afterbody smoke-gas area is included in 25- regions No.20~No.22 bellows);1 cold section of upper cover of 26- central coolers;2 cold sections of upper covers of 27- central coolers.
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. 22, region 2. 23, region 3. 24, region 4. 25;Institute Through head multi-tube dust cleaner 6 circulating flue gas mixing bellows 8 are led to by head flue gas blower fan 7 after stating region 1. flue gas collecting cold with ring The flue gas of 2 cold sections of upper covers 27 of machine 2 leads to sintering device flue gas circulation cover 5 after collecting by circulating flue gas blower fan 9;The region 2. with The sintered electric cleaner 10 of the flue gas of region 3. by main exhauster of sintering 11 lead to sintering flue gas desulfurization facility 12 after changed through flue gas Hot device 17 and pipeline afterburning heat riser 18 heats up laggard sintering denitrating flue gas facility (SCR) 19, then through flue gas heat-exchange unit 17 Cooling leads to the main chimney 21 of sintering by discharged gas fume blower fan 20;The region 4. flue gas through tail multi-tube dust cleaner 13 by tail cigarette Gas blower fan 14 lead to 1 cold section of upper cover 26 of high-temperature flue gas mixing bellows 15 and central cooler 2 flue gas collect after by high-temperature flue gas wind Machine 16, which leads to be led to by discharged gas fume blower fan 20 after the heat exchange of flue gas heat-exchange unit 17 cooling, sinters main chimney 21;
Embodiment:
With certain 210m2Exemplified by sintering machine, the detailed description of the environmental protection and energy saving handling process for sintering flue gas a kind of to the present invention It is as follows:
As shown in figure 1, in a 210m2On sintering machine 1, by the region 1. sintering machine head ignition zone No.1~ It is cold with ring that No.3 bellows flue gases through head multi-tube dust cleaner 6 by head flue gas blower fan 7 lead to circulating flue gas mixing bellows 8 after collecting The flue gas of 2 cold sections of upper covers 27 of machine 2, which collects to be formed to be led to sintering device flue gas by circulating flue gas blower fan 9 after circulation heat smoke and circulated, to be covered 5 carry out flue gas recirculation sintering;3. No.4~No.11 bellows flue gas of the region 2. sintering machine central-fore area is burnt with region The sintered electric cleaner 10 of No.12~No.19 bellows in knot machine postmedian region leads to sintering flue gas by main exhauster of sintering 11 After desulfurization equipment 12 through flue gas heat-exchange unit 17 and pipeline afterburning heat riser 18 heat up it is laggard sintering denitrating flue gas facility (SCR) 19, the outer row of the main chimney 21 of sintering is led to by discharged gas fume blower fan 20 after then cooling through flue gas heat-exchange unit 17;By the region 4. No.20~No.22 bellows flue gases in sintering machine afterbody high-temperature flue gas region collect after through tail multi-tube dust cleaner 13 by tail cigarette Gas blower fan 14 leads to high-temperature flue gas mixing bellows 15 and collects to form high temperature mixing cigarette with the flue gas of 1 cold section of upper cover 26 of central cooler 2 Lead to be led to by discharged gas fume blower fan 20 after flue gas heat-exchange unit 17 cools by high-temperature flue gas blower fan 16 after gas and sinter outside main chimney 21 Row;The flue gas of the region 5. 1 cold section of upper cover 26 of central cooler 2 is led into high-temperature flue gas mixing bellows 15 and region, and 4. flue gas converges Collection forms high temperature mixed flue gas;The flue gas of the region 6. 2 cold sections of upper covers 27 of central cooler 2 is led into circulating flue gas mixing bellows 8 and the flue gas of region 1. collect to form circulation heat smoke;
The embodiment can reduce outer heat extraction exhaust gas volumn 20% or so, sintering electric cleaner and main exhauster of sintering configuration model Reduce, reduce main exhauster of sintering power 23.8%;The exhaust gas volumn handled during flue gas desulfurization and denitrification reduces 40%~50% or so, SO in desulphurization denitration section flue gas2、NOxConcentration raising 50% or so, the equipment investment of sintering flue gas desulfurization denitrification apparatus and operating cost 40% or so can be reduced;Sintering Yield can be made to improve 2%, tumbler index improves 1.5%, and yield rate improves 2%, gas burnup Reduction by 12%~15%, solid burnup reduction by 2%~4%;Relative to conventional flue-gas denitration process, gas burnup reduction by 35% with On.
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 (8)

1. a kind of environmental protection and energy saving handling process for sintering flue gas, according to sintering flue gas SO in sintering process2、NOXConcentration is with flue gas Middle O2、COXThe Variation Features of concentration, flue-gas temperature, are divided into four regions, while again by sintering machine wind box along chassis traffic direction Plus cold section of cooler 1,2 cold sections of petticoat pipes totally six regions:SO in the flue gas of region 12, CO concentration it is higher, NOXConcentration is very low, by this Partially sinter flue gas and be mixed to form circulation heat smoke progress flue gas recirculation sintering with the flue gas of region 6;SO in the flue gas of region 22Concentration Relatively low, NOXIt is dense, this is partially sintered and carried out after flue gas collects with the flue gas of region 3 outside after dedusting, desulphurization and denitration processing Row;SO in the flue gas of region 32、NOXConcentration is all very high, this is partially sintered dedusting is carried out after flue gas collects with the flue gas of region 2, is taken off It is outer after sulphur, denitration process to arrange;SO in the flue gas of region 42、NOXConcentration is very low, and this is partially sintered into flue gas with the flue gas of region 5 mixes shape Outer after flue gas heat-exchange unit heat exchange arrange is introduced after into high temperature mixed flue gas;The flue gas of region 5 is 1 cold section of petticoat pipe flue gas of cooler, will This part heat smoke carries out being mixed to form high temperature mixed flue gas with the flue gas of region 4, introduces outer after flue gas heat-exchange unit heat exchange arrange;Area The flue gas of domain 6 is O in 2 cold sections of petticoat pipe flue gases of cooler, flue gas2Content O close in air2Contents level, by this part heat smoke with The flue gas of region 1 is mixed to form circulation heat smoke and carries out flue gas recirculation sintering, makes full use of the physical sensible heat of flue gas to improve fuel profit With rate, sintering solid burnup is reduced.
2. technique as claimed in claim 1, it is characterised in that according to sintering flue gas SO in sintering process2、NOXConcentration is with cigarette O in gas2、COXThe Variation Features of concentration and flue-gas temperature, are divided into four regions by sintering machine wind box along chassis traffic direction, right The sintering flue gas in this four regions be selectively segmented progress flue gas desulfurization and denitrification and with cooler part heat smoke integrate into The exhaust heat stepped utilization of row and flue gas recirculation sintering.
3. technique as claimed in claim 1, it is characterised in that region 1 is sintering machine head ignition zone, scope includes sintering Several bellows of chain-drive section non-coated igniter regions, 110~120 DEG C of flue wind-warm syndrome;Region 2 is sintering machine central-fore area, model Enclose including preceding several bellows, 100~110 DEG C of flue wind-warm syndrome in the middle part of sintering machine;Region 3 is sintering machine postmedian region, model Enclose including several bellows, 120~180 DEG C of flue wind-warm syndrome behind sintering machine middle part;Region 4 is sintering machine afterbody high-temperature flue gas area Domain, scope includes the several bellows in sintering machine afterbody sintering end point region, 320~400 DEG C of flue wind-warm syndrome;Region 5 is cooling 1 cold section of petticoat pipe of machine, scope includes 1 cold section of petticoat pipe heat smoke of cooler, 350 DEG C~420 DEG C of flue-gas temperature;Region 6 is cooler 2 Cold section of petticoat pipe, scope includes 2 cold sections of petticoat pipe heat smokes of cooler, 280 DEG C~320 DEG C of flue-gas temperature.
4. the technique as described in one of right 1-3, it is characterised in that region 1 is sintered into flue gas through multi-tube dust cleaner dedusting Hou Yu areas 6 cooler of domain, 2 cold sections of petticoat pipe heat smokes are mixed to form circulation heat smoke and carry out flue gas recirculation sintering, on the one hand utilize sinter bed Middle base mix band, wet bands excessively are to SO2Strong adsorption effect, region 1 is sintered into SO in flue gas2Sintered with region 2, region 3 SO in flue gas2It is enriched with;The sintering CO concentration in flue gas of another aspect region 1 is higher, using calcium ferrite in sinter bed to NOX Self catalyzed reduction effect, further reduction region 2, region 3 sintering flue gas in NOXConcentration.
5. the technique as described in one of right 1-3, it is characterised in that burn 6 cooler of region, 2 cold sections of petticoat pipe heat smokes with region 1 Knot flue gas is mixed to form circulation heat smoke and carries out flue gas recirculation sintering, on the one hand makes full use of the physical sensible heat of heat smoke to improve combustion Expect utilization rate, reduce sintering solid burnup;On the other hand due to O in this partial fume2Concentration is more than 18%, can significantly improve Flue gas recirculation sinters effect.
6. the technique as described in one of right 1-3, it is characterised in that region 2, region 3 are sintered into the sintered electric cleaner of flue gas and removed Flue gas desulfurization facilities are introduced after dirt flue gas heat-exchange unit heating is led to after desulfurization process, the heat smoke after heating is on flue Directly progress afterburning is warming up to meet and introduced after SCR denitrating flue gas temperature requirements after denitrating flue gas facility is handled through denitrating flue gas again Lead to outside the main chimney of sintering and arrange after flue gas heat-exchange unit is cooled.
7. the technique as described in one of right 1-3, it is characterised in that region 4 is sintered into flue gas through multi-tube dust cleaner dedusting and region 51 cold section of cooler petticoat pipe heat smokes, which are mixed to form after high temperature mixed flue gas to introduce after flue gas heat-exchange unit carries out heat exchange, leads to burning Tie and arranged outside main chimney.
8. the technique as described in one of right 1-3, it is characterised in that cold section, the 2 cold sections petticoat pipe heat smokes of cooler 1 are separated into profit With to improve fume afterheat utilization ratio, realizing exhaust heat stepped utilization.
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