CN105135895A - Selective sintering flue gas sectional type comprehensive treatment technology - Google Patents
Selective sintering flue gas sectional type comprehensive treatment technology Download PDFInfo
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- 238000005245 sintering Methods 0.000 title claims abstract description 153
- 239000003546 flue gas Substances 0.000 title claims abstract description 142
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 238000005516 engineering process Methods 0.000 title abstract description 14
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 39
- 230000023556 desulfurization Effects 0.000 claims abstract description 38
- 238000011084 recovery Methods 0.000 claims abstract description 27
- 239000000428 dust Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 69
- 239000003517 fume Substances 0.000 claims description 65
- 239000000779 smoke Substances 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 9
- 208000011580 syndromic disease Diseases 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000010276 construction Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010248 power generation Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 206010017472 Fumbling Diseases 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Treating Waste Gases (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a selective sintering flue gas sectional type comprehensive treatment technology, and belongs to the technical field of energy conservation and environmental protection. Flue gas circulation sintering is performed on ignition section flue gas with the high SO2 concentration and the low NOx concentration at a sintering head part; dust removal and desulfurization are performed on flue gas with the high SO2 concentration at a sintering middle part and then the flue gas is exhausted out; dust removal is performed on flue gas with the low SO2 concentration and the low NOx concentration at the sintering middle part and then the flue gas is exhausted out; dust removal and denitrification are performed on flue gas with the low SO2 concentration and the high NOx concentration at a sintering tail part, then the flue gas is mixed with flue gas at a high temperature section of a cooler, and waste heat recovery is performed; heated air circulation sintering is performed on the recycled hot flue gas; and steam generated after waste heat recycling can be used for waste heat power generation or steam-driving sintering of a main suction fan. According to the selective sintering flue gas sectional type comprehensive treatment technology, sintering flue gas section desulfurization and denitrification are achieved, and the flue gas discharge amount is decreased; and the flue gas waste heat recycling efficiency is improved, the construction investment and production running cost are lowered on the whole, and the selective sintering flue gas sectional type comprehensive treatment technology conforms to the energy-saving, environment-friendly, emission reduction, consumption reduction, efficiency increase and recycling economic running mode.
Description
Technical field
The invention belongs to the energy-conserving and environment-protective of iron and steel metallurgical industry SINTERING PRODUCTION operation, reduce discharging consumption-reducing technological field, relate to the segmented comprehensive processing technique of a kind of sintering flue gas desulfurization denitration and fume afterheat cascade utilization, be specifically related to the comprehensive processing technique of a kind of optionally sinter fume segmented desulphurization denitration, hot air circulation sintering and flue gas heat recovery, more specifically relate to a kind of based on SO under flue gas different temperatures
2, NO
x, CO
xthe one optionally sinter fume segmented comprehensive processing technique of CONCENTRATION DISTRIBUTION feature.
Background technology
Steel and iron industry is energy consumption rich and influential family, Ye Shi heavy polluter, and sintering circuit is one of primary pollution source of discharged air pollutant in steel and iron industry, especially SO
2and NO
xmaximum generation source, about have the SO of 51% ~ 62% in steel smelting procedure
2and the NO of 48%
xfrom sintering circuit.In Ore Sintering Process, the sulphur brought into by crude fuel is oxidized to the SO of gaseous state in high-temperature sintering process
2, and the nitrogen oxide brought into by fuel is oxidized to the NO of gaseous state in high-temperature sintering process
x.At different sintering sections, along with material temperature constantly raises and O in sintering atmosphere
2and CO
xthe change of concentration, SO in sinter fume
2and NO
xconcentration also produces corresponding change.
Current sinter fume pollutant removing technology is a lot, but is the end treatment technique for Single Pollution thing mostly, such as sinter fume dedusting, desulfurization etc.Because sinter fume amount is large, and SO
2, NO
xlower etc. pollutant levels, cause the construction of current sinter fume treatment facility and production run cost all very high, and efficiency is lower.Along with China's air environment protection emission index request is more and more tighter, and require that sinter fume not only wants desulfurization also to want denitration in iron and steel " 13 " planning.Current sintering flue gas desulfurization has started to enforce, and the main sinter fume that adopts exports complete de-process, and flue gas desulfurization can be divided into several modes such as wet method, dry method and semidry method, and all kinds of technique removal effect is generally overall; Denitrating flue gas roughly has several mode such as SNCR, SCR and catalytic oxidation, SCR method comparative maturity is feasible, but the domestic example run of also not going into operation at present, main cause is that lower cannot the realization of sinter fume outlet temperature directly takes off process entirely, flue gas must be heated to reaction temperature in advance, increases so again and builds and production run cost.
Along with the successive optimization of steel and iron industry production procedure and the continuous decline of process energy consumption, the residual heat and energy recycling each production process becomes one of the most effective approach of iron and steel enterprise's energy-saving and emission-reduction.Sintering plant revamp accounts for 10% ~ 15% of iron and steel enterprise's total energy consumption, is only second to Iron-smelting.The external advanced index of average energy loss-rate of current Chinese sintering circuit sintering deposit per ton exceeds about 20%, its one of the main reasons is waste heat recovery and utilizes level lower, current China sintering circuit utilization rate of waste heat is also less than 30%, and therefore high efficiente callback utilizes waste heat resources in sintering process and improves sintering waste heat recovery utilization rate is one of the Main way and approach that reduce sintering plant revamp.
Sintering process waste heat recovery source mainly contains two large divisions: be 1. about 350 DEG C ~ 420 DEG C in the heat smoke temperature of cooler high temperature section, this part sensible heat accounts for 29.3% of total amount of heat, in recent years, be widely used sinter cooler heat smoke heat recovery technology (waste heat producing steam moves main exhauster of sintering in order to generating or vapour traction) popularization; 2. the flue-gas temperature of discharging in sintering machine tail bellows high temperature section is 320 DEG C ~ 400 DEG C, this part sensible heat accounts for 23.6% of total amount of heat, sintering machine tail high-temperature flue gas heat recovery technology is in the stage of fumbling, is mainly used in hot gas sintering technique at present, and waste heat producing steam technology is not also applied.Two large divisions's residual heat integrative process application, from the high efficiency and the economy point analysis that realize energy cascade utilization, is the developing direction improving effective UTILIZATION OF VESIDUAL HEAT IN to greatest extent by two large divisions's waste heat also just single recovery utilization at present of sintering process.
In sum, the control of current sinter fume pollutant, removal methods belong to the end-o f-pipe-control technique of function singleness more, and along with increasing of pollutant limiting emission kind, end-o f-pipe-control process facility can only get more and more, take up an area increasing, cause construction investment and operating cost constantly to rise; The waste heat of sintering circuit is also the recycling at single position, many-sided waste such as cause equipment investment operation equally, place takies.Therefore, need according to the smoke characteristic in sintering process flow process and production process, exploitation more economically, energy-conserving and environment-protective efficiently, reduce discharging consumption reduction technology.
Summary of the invention
In view of above-mentioned problems, the present invention have studied in Ore Sintering Process, at different sintering sections, along with O in sintering atmosphere
2the change of concentration, SO in sinter fume
2, NO
xand CO
xconcentration along with material temperature constantly raise produce corresponding change, and consider sintering machine tail flue gas, part cooler high-temperature hot fume afterheat are carried out to classification, recycle, so realize sinter fume whole energy environmental protection, reduce discharging consumption reduction technique.
Therefore, the object of the present invention is to provide one optionally sinter fume segmented comprehensive processing technique, this technique be sinter fume segmentation desulphurization denitration Processing tecchnics and sinter fume cycle production process and fume afterheat Comprehensive recycle technology are carried out organically combine sintering flue gas desulfurization denitration, reduction of discharging improve the comprehensive processing technique of heat recovery rate, this technique entirety reduces construction investment and production run cost, meets operating Mode of Circular Economy.
To achieve these goals, the present invention adopts following technical scheme:
One is sinter fume segmented comprehensive processing technique optionally, according to sinter fume SO in sintering process
2, NO
x, CO
xconcentration is along with O in flue gas
2the Variation Features of concentration, flue-gas temperature, is divided into four regions to add totally five regions, cooler high temperature section region along chassis traffic direction sintering machine wind box simultaneously, is described below:
Region is (sintering machine head ignition zone, flue wind-warm syndrome 110 ~ 120 DEG C) 1., SO in the sinter fume of one's respective area
2, CO concentration is higher, NO
xconcentration is very low;
Region 2. (in the middle part of sintering machine smoke directly ventilating region, flue wind-warm syndrome 100 ~ 110 DEG C), SO in the sinter fume of one's respective area
2, NO
xconcentration is very low, and simultaneously due to 4. with after the heat of mixing flue gas heat recovery 5. of region region is caused one's respective area and carry out hot air circulation sintering, the physical sensible heat making full use of flue gas on the one hand improves fuel availability, reduces sintering solid burnup; Utilize original compound band in sinter bed on the other hand, cross wet bands to SO
2strong adsorption effect, calcium ferrite can also to be utilized in sinter bed NO simultaneously
xself catalyzed reduction effect, synchronous reduce SO in line flue gas
2, NO
xconcentration;
Region 3. (in the middle part of sintering machine flue gas desulfurization region, flue wind-warm syndrome 120 ~ 180 DEG C), SO in the sinter fume of one's respective area
2dense, NO
xconcentration is lower, simultaneously due to by region 1. flue gas cause one's respective area and carry out flue gas recirculation sintering, on the one hand by SO in region 1. flue gas
2with SO in the flue gas of one's respective area
2collect, realize SO
2flue gas desulfurization is carried out after enrichment; On the other hand 1. CO concentration in flue gas is higher in region, and calcium ferrite can be continued to utilize in sinter bed NO
xself catalyzed reduction effect, further reduce NO in desulfurization fume
xconcentration;
Region is (sintering machine afterbody denitrating flue gas region, flue wind-warm syndrome 320 ~ 400 DEG C) 4., NO in the sinter fume of one's respective area
x, O
2content concn is very high, SO
2, CO
xconcentration is very low, and flue-gas temperature, more than 320 DEG C, can carry out SCR denitrating flue gas.After denitration heat smoke and region 5. the mixed flue gas of flue gas (be called for short heat of mixing flue gas, temperature is at 340 DEG C ~ 380 DEG C) cause region after introducing the heat exchange of flue gas heat recovery facility and 2. carry out hot air circulation sintering.
Region is (cooler high-temperature flue gas region, heat smoke temperature 350 DEG C ~ 420 DEG C) 5., O in the flue gas of one's respective area
2content is close to O in air
2contents level, therefore one's respective area flue gas can carry out being mixed to form heat of mixing flue gas with the flue gas of region 4. after SCR denitration, causes region and 2. carry out hot air circulation sintering after the heat exchange of heat recovery facility.
Described region 1. scope comprises several bellows of sintering machine head non-coated igniter regions, causes region and 3. carries out flue gas recirculation sintering after bellows flue gas is pooled to head flue through head multi-tube dust cleaner, head circulating fan;
Described region 2. scope comprises several bellows before in the middle part of sintering machine, causes the main chimney of sintering and directly discharges after bellows flue gas is pooled in line flue through sintering electric cleaner, main exhauster of sintering;
Described region 3. scope to comprise in the middle part of sintering machine after several bellows, after bellows flue gas is pooled to desulfurization fume pipeline through electric cleaner, sintering flue gas desulfurization facility, desulphurization devices cause in line flue collect after by main smoke stack emission;
The visual sintering field condition of process choice of described sintering flue gas desulfurization facility and actual production situation, select the mode such as wet method, semidry method, and conventional process is as ammonia process, magnesium processes, calcium method, lime stone-gypsum method, SDA rotary spraying technique etc.
Described region 4. scope comprises the several bellows in sintering machine afterbody sintering end point region, after bellows flue gas is pooled to denitration flue after tail multi-tube dust cleaner, sinter fume denitration facility (SCR), denitration booster fan and region flue gas be 5. pooled to waste heat recovery flue and form heat of mixing flue gas, this flue gas causes region by tail circulating fan through tail circulating flue gas pipeline and 2. carries out hot air circulation sintering after sinter fume heat recovery facility.
Described region 5. scope comprises cooler high temperature section heat smoke, the desirable central cooler of sintering circular cooler (abbreviation central cooler) high temperature section one cold section generally adopted at present and part secondary cooling zone heat smoke, high-temperature hot flue gas causes region by tail circulating fan through tail circulating flue gas pipeline after being pooled to region waste heat recovery flue 4. and 2. carries out hot air circulation sintering after sinter fume heat recovery facility.
Described sinter fume heat recovery facility comprises a whole set of waste heat producing steam facilities such as waste heat boiler, drum, oxygen-eliminating device, according to sintering field condition and actual production situation, can select the steam of different size waste heat boiler production various criterion.According to prior art, saturated vapor can be produced for sintering the compound steam preheating in second drum mixer and sintering machine head mixed-hopper, also can produce superheated steam to deliver to power generating equipment and carry out cogeneration (this technology is in and promotes the stage on a large scale), also steam directly can be caused the vapour dragging device in main exhauster of sintering room, main exhauster of sintering is dragged by electricity and is transformed into vapour and drags or vapour-electricity is mixed drags (this technology is in and promotes the stage among a small circle, directly can save the huge power consumption of main exhauster of sintering).
Compared with Process configuration of the present invention configures with conventional sintering process, the configuration of the sintering such as sintering machine and igniter main equipment is identical, and the main distinction is the Process configuration of sinter fume system.Tool has the following advantages compared with traditional handicraft:
1. sintering circuit reduces outer heat extraction exhaust gas volumn about 23.6%, and corresponding sintering electric cleaner and main exhauster of sintering configuration model reduce, and reduce main exhauster of sintering power 23.8%, reduce construction investment and production run cost;
2. the exhaust gas volumn processed during flue gas desulfurization and denitrification reduces about 40% ~ 60%, SO in desulfurization section flue gas
2nO in concentration and denitration section flue gas
xconcentration improves about 50%, and desulfurization off sulfide effect can improve about 4%, and the equipment investment of sintering flue gas desulfurization denitrification apparatus and operating cost can reduce about 40%;
3. hot air circulation sintering can make Sintering Yield improve 2%, and tumbler index improves 1.5%, and yield rate improves 2%, and gas burnup reduces by 12% ~ 15%, and solid burnup reduces by 2% ~ 4%;
4. heat of mixing fume afterheat producing steam can issue additional 5kWh for generating relatively conventional central cooler heat smoke cogeneration sintering deposit per ton; Afterheat steam is used for vapour and drags main exhauster of sintering to be equivalent to sintering deposit per ton saving power consumption 25kWh, and the economic benefit therefore produced is considerable.
Present invention achieves sinter fume segmentation desulphurization denitration Processing tecchnics and SINTERING PRODUCTION flue gas recirculation technique and fume afterheat Comprehensive recycle technology carried out organically combine sinter fume environmental protection, reduction of discharging, energy-conservation, lower consumption, the comprehensive processing technique of synergy, overall reduction is invested and operation cost, increase economic efficiency, meet operating Mode of Circular Economy.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the specific embodiment of the invention 1.
In figure, mark is as follows:
1-sintering machine; 2-ignition furnace; 3-hot air circulation cover; 4-flue gas recirculation cover; 5-head multi-tube dust cleaner; 6-head circulating fan; 7-sinters electric cleaner; 8-main exhauster of sintering; 9-desulfurization electric cleaner; 10-sintering flue gas desulfurization facility; 11-desulphurization devices; 12-tail multi-tube dust cleaner; 13-sinter fume denitration facility (SCR); 14-denitration booster fan; 15-tail circulating fan; 16-heat smoke mixing bellows; 17-sinter fume heat recovery facility; 18-sinter cooler (central cooler); 19-cooler high temperature section petticoat pipe; 20-sinters main chimney; 21-region is (sintering machine head ignition zone comprises No.1 ~ No.3 bellows) 1.; 22-region is (in the middle part of sintering machine, smoke directly ventilating region comprises No.4 ~ No.11 bellows) 2.; 23-region is (in the middle part of sintering machine, flue gas desulfurization region comprises No.12 ~ No.19 bellows) 3.; 24-region is (sintering machine afterbody denitrating flue gas region comprises No.20 ~ No.22 bellows) 4.; 25-region is (cooler high-temperature flue gas region comprises cold section of central cooler one and part secondary cooling zone heat smoke petticoat pipe) 5..
Fig. 2 is the sintering machine wind box flue gas inspection wind-warm syndrome table of instantiation 1 of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described further, but not as limit.
As shown in Figure 1, described system comprises sintering machine 1, region 1. 21, region 2. 22, region 3. 23, region 4. 24; Be connected with the flue gas recirculation cover 4 of head circulating fan 6 and sintering machine 1 respectively again after described region bellows 1. connect head multi-tube dust cleaner 5; Described region bellows 2. after connecting sintering electric cleaner 7 more respectively with main exhauster of sintering 8 with sinter main chimney 20 and be connected; Described region bellows 3. after connecting desulfurization electric cleaner 9 more respectively with sintering flue gas desulfurization facility 10 and desulphurization devices 11 and sinter main chimney 20 and be connected; Be connected with the hot air circulation cover 3 of sinter fume denitration facility (SCR) 13 and denitration booster fan 14, heat smoke mixing bellows 16, sinter fume heat recovery facility 17, tail circulating fan 18 and sintering machine 1 respectively again after described region bellows 4. connect tail multi-tube dust cleaner 12; Be connected with the hot air circulation cover 3 of sinter fume heat recovery facility 17, tail circulating fan 18 and sintering machine 1 respectively again after the heat smoke petticoat pipe in 5. cooler high-temperature flue gas region, described region connects heat smoke mixing bellows 16;
Embodiment:
With certain 210m
2sintering machine is example, to being described in detail as follows of the present invention's a kind of optionally sinter fume segmented comprehensive processing technique:
As shown in Figure 1, at a 210m
2on sintering machine 1, the flue gas recirculation cover 4 causing sintering machine 1 through head multi-tube dust cleaner 5 by head circulating fan 6 after No.1 ~ No.3 bellows sinter fume of described region 1. sintering machine head ignition zone is pooled to head flue carries out flue gas recirculation sintering; Directly discharge causing the main chimney 20 of sintering through sintering electric cleaner 7 by main exhauster of sintering 8 after No.4 ~ No.11 bellows sinter fume in smoke directly ventilating region is pooled in line flue in the middle part of described region 2. sintering machine; Discharged entering to be caused after in line flue collects by desulphurization devices 11 after sintering flue gas desulfurization facility 10 carries out flue gas desulfurization process through desulfurization electric cleaner 9 after in the middle part of described region 3. sintering machine, No.12 ~ No.19 bellows sinter fume in flue gas desulfurization region is pooled to desulfurization fume pipeline by the main chimney 20 of sintering; Enter through tail multi-tube dust cleaner 12 after No.20 ~ No.22 bellows sinter fume in 4. sintering machine afterbody denitrating flue gas region, described region is pooled to denitration flue and cause heat smoke mixing bellows 16 and region flue gas 5. by denitration booster fan 14 after sinter fume denitration facility (SCR) 13 carries out denitrating flue gas process and collect and form heat of mixing flue gas, the hot air circulation cover 3 that this flue gas causes sintering machine 1 by tail circulating fan 18 through tail circulating flue gas pipeline after sinter fume heat recovery facility 17 carries out hot air circulation sintering; The cooler high temperature section heat smoke of described region 5. cooler high-temperature flue gas region (cold section of central cooler one and part secondary cooling zone heat smoke petticoat pipe) is pooled to heat smoke mixing bellows 16 and the region heat smoke after denitrating flue gas 4. to collect and form heat of mixing flue gas, the hot air circulation cover 3 that this flue gas causes sintering machine 1 by tail circulating fan 18 through tail circulating flue gas pipeline after sinter fume heat recovery facility 17 carries out hot air circulation sintering;
This embodiment can reduce outer heat extraction exhaust gas volumn about 23.6%, and corresponding sintering electric cleaner and main exhauster of sintering configuration model reduce, and reduce main exhauster of sintering power 23.8%; The exhaust gas volumn processed during flue gas desulfurization and denitrification reduces about 40% ~ 60%, SO in desulfurization section flue gas
2nO in concentration and denitration section flue gas
xconcentration improves about 50%, and desulfurization off sulfide effect can improve about 4%, and the equipment investment of sintering flue gas desulfurization denitrification apparatus and operating cost can reduce about 40%; Sintering Yield can be made to improve 2%, and tumbler index improves 1.5%, and yield rate improves 2%, and gas burnup reduces by 12% ~ 15%, and solid burnup reduces by 2% ~ 4%; Relatively conventional central cooler heat smoke cogeneration sintering deposit per ton can issue additional 5kWh; Afterheat steam is used for vapour and drags main exhauster of sintering to be equivalent to sintering deposit per ton saving power consumption 25kWh.
Although describe embodiments of the present invention by reference to the accompanying drawings, those of ordinary skill in the art can make various distortion or amendment in the scope of described claim.
Claims (8)
1. an optionally sinter fume segmented comprehensive processing technique, according to sinter fume SO in sintering process
2, NOx, COx concentration is along with O in flue gas
2the Variation Features of concentration, flue-gas temperature, is divided into four regions by sintering machine wind box along chassis traffic direction, adds totally five regions, cooler high temperature section region: SO in the sinter fume of region 1 simultaneously
2, CO concentration is higher, NO
xconcentration is very low, and this part flue gas is carried out flue gas recirculation sintering; SO in the sinter fume of region 2
2, NO
xconcentration is very low, arranges directly outer after this part flue gas ash removal; SO in the sinter fume of region 3
2dense, NO
xconcentration is lower, outer row after this part flue gas being carried out desulfurization process; NO in the sinter fume of region 4
x, O
2content concn is very high, SO
2, CO
xconcentration is very low, carries out flue gas heat recovery and then carry out hot air circulation sintering after this part flue gas is carried out denitration with region 5 flue gas after mixing; O in the cooler high-temperature flue gas of region 5
2content is close to O in air
2contents level, carries out flue gas heat recovery after being mixed by this part flue gas and then carry out hot air circulation sintering with flue gas after the denitration of region 4.
2. technique as claimed in claim 1, is characterized in that according to sinter fume SO in sintering process
2, NOx, COx concentration is along with O in flue gas
2the Variation Features of concentration, flue-gas temperature, sintering machine wind box is divided into four regions along chassis traffic direction, to the sinter fume in these four regions optionally carry out flue gas desulfurization and denitrification, flue gas recirculation sintering, flue gas hot gas sintering and and cooler high temperature section smoke comprehensive carry out the segment processing of heat recovery.
3. technique as claimed in claim 1, it is characterized in that region 1 is for sintering machine head ignition zone, scope comprises several bellows of sintering machine head non-coated igniter regions, flue wind-warm syndrome 110 ~ 120 DEG C; Region 2 is smoke directly ventilating region in the middle part of sintering machine, and scope comprises several bellows before in the middle part of sintering machine, flue wind-warm syndrome 100 ~ 110C; Region 3 is flue gas desulfurization region in the middle part of sintering machine, and scope comprises several bellows after in the middle part of sintering machine, flue wind-warm syndrome 120 ~ 180 DEG C; Region 4 is sintering machine afterbody denitrating flue gas region, and scope comprises the several bellows in sintering machine afterbody sintering end point region, flue wind-warm syndrome 320 ~ 400 DEG C; Region 5 is cooler high-temperature flue gas region, and scope comprises cooler high temperature section and to give up flue gas, useless flue-gas temperature 350 DEG C ~ 420 DEG C.
4. the technique as described in one of right 1-3, it is characterized in that region 1 sinter fume is caused region 3 after multi-tube dust cleaner dedusting carries out flue gas recirculation sintering, and region 3 flue gas collects to realize SO
2enrichment, carries out arranging outward after sintering flue gas desulfurization process reaches national regulation requirement.
5. the technique as described in one of right 1-3, is characterized in that hot air circulation sintering is carried out in region 2, and the physical sensible heat making full use of flue gas on the one hand improves fuel availability, reduces sintering solid burnup; Utilize original compound band in sinter bed on the other hand, cross wet bands to SO
2strong adsorption effect, to utilize in sinter bed calcium ferrite to NO simultaneously
xself catalyzed reduction effect, further reduce SO in line flue gas
2, NO
xconcentration, sinter fume to reach after national regulation requirement outer row through the dedusting of head electric cleaner.
6. the technique as described in one of right 1-3, is characterized in that flue gas recirculation sintering is carried out in region 3, on the one hand by SO in the sinter fume of region 1
2with SO in the flue gas of one's respective area
2collect, realize SO
2flue gas desulfurization process is carried out after enrichment; On the other hand region 1 CO concentration in flue gas is higher, and calcium ferrite can be continued to utilize in sinter bed NO
xself catalyzed reduction effect, further reduce NO in desulfurization fume
xconcentration, make sinter fume after electric cleaner dedusting, carry out flue gas desulfurization process and reach outer row after national regulation requirement.
7. the technique as described in one of right 1-3, it is characterized in that region 4 sinter fume carries out heat smoke after the process of SCR denitrating flue gas after multi-tube dust cleaner dedusting and region 5 cooler high-temperature waste flue gas is mixed to form heat of mixing flue gas, cause region 2 after introducing the heat exchange of flue gas heat recovery facility and carry out hot air circulation sintering, O in circulating flue gas
2concentration is greater than 18%.
8. the technique as described in one of right 1-3, it is characterized in that region 5 cooler high-temperature waste flue gas and region 4 heat smoke carried out after denitrating flue gas process are mixed to form heat of mixing flue gas, cause region 2 after introducing the heat exchange of flue gas heat recovery facility and carry out hot air circulation sintering, O in circulating flue gas
2concentration is greater than 18%.
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