CN105509491A - Environmental-protection and energy-conservation treatment technology of sintering flue gas - Google Patents
Environmental-protection and energy-conservation treatment technology of sintering flue gas Download PDFInfo
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- CN105509491A CN105509491A CN201510894805.XA CN201510894805A CN105509491A CN 105509491 A CN105509491 A CN 105509491A CN 201510894805 A CN201510894805 A CN 201510894805A CN 105509491 A CN105509491 A CN 105509491A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 227
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 220
- 238000005245 sintering Methods 0.000 title claims abstract description 121
- 238000005516 engineering process Methods 0.000 title abstract description 8
- 238000004134 energy conservation Methods 0.000 title abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 19
- 230000023556 desulfurization Effects 0.000 claims abstract description 19
- 230000007613 environmental effect Effects 0.000 claims abstract description 14
- 239000000428 dust Substances 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 7
- 239000003517 fume Substances 0.000 claims description 62
- 238000000034 method Methods 0.000 claims description 61
- 239000000779 smoke Substances 0.000 claims description 16
- 230000001351 cycling effect Effects 0.000 claims description 11
- 208000011580 syndromic disease Diseases 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 6
- 239000002918 waste heat Substances 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 abstract 3
- 238000010531 catalytic reduction reaction Methods 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 230000000295 complement effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 20
- 238000002156 mixing Methods 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 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
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 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
- 239000003034 coal gas Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 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
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/02—Separation 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
- B01D53/04—Separation 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/502—Carbon monoxide
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treating Waste Gases (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses an environmental-protection and energy-conservation treatment technology of sintering flue gas, and belongs to the technical field of energy conservation and environmental protection. Flue gas having high SO2 concentration and very low NOx concentration at a sintering head is subjected to dust removal, and is mixed with hot flue gas in a flue gas hood at a second cooling section of a cooling machine to form circulating hot flue gas, and then flue gas circulating sintering is carried out; flue gas having high SO2 concentration and high NOx concentration at a sintering middle part is subjected to the dust removal and then flue gas desulfurization, the desulfurized flue gas is sintered and cooled by a flue gas heat exchanger, undergoes preheating temperature-rising, then undergoes pipeline complementary combustion temperature-rising to meet the requirement on SCR (Selective Catalytic Reduction) denitration temperature, flue gas denitration is carried out, and the denitrified flue gas is discharged; flue gas having low SO2 concentration and low NOx concentration at a sintering tail is subjected to the dust removal, and is mixed with hot flue gas in the flue gas hood at a first cooling section of the cooling machine to form high-temperature mixed flue gas, the high-temperature mixed flue gas is subjected to heat exchange by the flue gas heat exchanger, the flue gas after being subjected to heat exchange and cooled is directly discharged. According to the treatment technology, the effects of sectional desulfurization and denitration of sintering flue gas, and reduction in flue gas emission are realized; waste heat of the flue gas is used, so that the denitrified flue gas heating consumption is reduced; the construction investment and production running cost are reduced integrally; and the treatment technology corresponds with the running mode of energy conservation, environmental protection, emission reduction, consumption reduction, effect increasing and circular economy.
Description
Technical field
The invention belongs to the environmental protection of iron and steel metallurgical industry SINTERING PRODUCTION operation, field of energy-saving technology, relate to a kind of environmental protection and energy saving treatment process of sinter fume, be specifically related to the comprehensive processing technique of a kind of desulphurization denitration of sinter fume, flue gas recirculation sintering and fume afterheat cascade utilization, more specifically relate to a kind of based on SO under flue gas different temperatures
2, NO
xthe environmental protection and energy saving treatment process of a kind of sinter fume of CONCENTRATION DISTRIBUTION feature and flue gas recirculation, UTILIZATION OF VESIDUAL HEAT IN treatment process.
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 sintering production process, SO in different sintering section flue gases
2and NO
xconcentration and flue-gas temperature have corresponding relation.
Current sinter fume pollutant removing technology 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 investment construction of current sinter fume treatment facility and operation cost all very high, and efficiency is lower.Along with China's air environment protection emission index request is more and more tighter, in iron and steel " 13 " planning, not only require that sintering flue gas desulfurization also wants denitration.Current sintering flue gas desulfurization has started to enforce, and the main sinter fume that adopts exports complete de-process, mainly contains several modes such as wet method, dry method and semidry method; 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, if main cause to be sinter fume outlet temperature lower directly complete de-process must be heated to reaction temperature in advance, so build and operation cost too high.
Sinter cooler 1 cold section, 2 cold sections petticoat pipe flue-gas temperatures are about 280 DEG C ~ 420 DEG C, this part sensible heat accounts for 37.3% of sintering circuit total amount of heat, and the flue-gas temperature that sintering machine tail bellows high temperature section is discharged is 320 DEG C ~ 400 DEG C, this part sensible heat accounts for 23.6% of sintering circuit total amount of heat, this two large divisions's waste heat is also that single recovery producing steam is used at present, from the high efficiency and the economy point analysis that realize energy cascade utilization, be the developing direction improving effective UTILIZATION OF VESIDUAL HEAT IN to greatest extent by two large divisions's residual heat integrative process application.
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 operation cost constantly to rise; The waste heat of sintering circuit is also the recycling at single position, many-sided waste such as cause construction operation cost equally, place takies.Therefore, need according to the smoke characteristic in sintering process flow process and production process, exploitation more economically, environmental protection and energy saving technology efficiently.
Summary of the invention
In view of above-mentioned problems, the present invention have studied in Ore Sintering Process, at different sintering sections, and SO in sinter fume
2, NO
xconcentration along with material temperature constantly raise produce corresponding change, and to consider sintering machine tail flue gas, cooler 1 cold section, 2 cold sections petticoat pipe fume afterheat classified utilization, and then form the overall environmental protection energy saving technique of sinter fume.
Therefore, the object of the present invention is to provide a kind of environmental protection and energy saving treatment process of sinter fume, this technique is sinter fume environmental protection and energy saving treatment process sinter fume segmentation desulphurization denitration Processing tecchnics and flue gas recirculation SINTERING PRODUCTION technique and fume afterheat cascade utilization technique being carried out organically combining, 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:
An environmental protection and energy saving treatment process for sinter fume, according to sinter fume SO in sintering process
2, NO
xsintering machine wind box, along with the Variation Features of flue-gas temperature, is divided into four regions to add totally six regions, cooler 1 cold section, 2 cold sections petticoat pipe regions along chassis traffic direction simultaneously, is described below by concentration:
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, N0
xconcentration is very low, by one's respective area flue gas and region 6. flue gas carry out being mixed to form cycling hot flue gas, cause sintering device flue gas circulation cover and carry out flue gas recirculation sintering.
Region is (sintering machine central-fore area, flue wind-warm syndrome 100 ~ 110 DEG C) 2., SO in the sinter fume of one's respective area
2, NO
xconcentration is all higher, simultaneously causes one's respective area carry out flue gas recirculation sintering owing to 1. region to be mixed to form cycling hot flue gas with region flue gas 6., utilize original compound band in sinter bed on the one hand, cross wet bands to SO
2strong adsorption effect; On the other hand 1. CO concentration in flue gas is higher in region, and calcium ferrite can be utilized in sinter bed NO
xself catalyzed reduction effect, reach and reduce SO in flue gas simultaneously
2, NO
xconcentration.
Region is (sintering machine postmedian region, flue wind-warm syndrome 120 ~ 180 DEG C) 3., SO in the sinter fume of one's respective area
2, NO
xconcentration is all very high, simultaneously causes one's respective area carry out flue gas recirculation sintering, by SO in region 1. flue gas owing to 1. region to be mixed to form cycling hot flue gas with region flue gas 6.
2, NO
xwith SO in the flue gas of one's respective area
2, NO
xcollect, realize SO
2, NO
xflue gas desulfurization and denitrification is carried out after enrichment.
Region is (sintering machine afterbody high-temperature flue gas region, flue wind-warm syndrome 320 ~ 400 DEG C) 4., SO in the sinter fume of one's respective area
2, NO
xconcentration is all very low, flue-gas temperature more than 320 DEG C, with region 5. flue gas is formed after mixing after high temperature mixed flue gas (temperature 340 DEG C ~ 380 DEG C) introduces flue gas heat-exchange unit heat exchange and arranges outward.
Region is (cooler 1 cold section of petticoat pipe, flue-gas temperature 350 DEG C ~ 420 DEG C) 5., and one's respective area flue gas and region 4. flue gas carry out being mixed to form high temperature mixed flue gas, outer row after introducing flue gas heat-exchange unit heat exchange.
Region is (cooler 2 cold sections of petticoat pipes, flue-gas temperature 280 DEG C ~ 320 DEG C) 6., O in the flue gas of one's respective area
2content is close to O in air
2contents level, by one's respective area flue gas and region 1. flue gas carry out being mixed to form cycling hot flue gas, cause sintering device flue gas circulation cover and carry out flue gas recirculation sintering, the physical sensible heat making full use of this part flue gas improves fuel availability, reduces sintering solid burnup.
Described region 1. scope comprises the bellows of sintering machine head non-coated igniter regions, and one's respective area flue gas, through head multi-tube dust cleaner, causes circulating flue gas mixing bellows by head flue gas blower fan.
Described region 2. scope comprises the bellows of sintering machine middle front part, one's respective area flue gas and region 3. flue gas cause sinter fume denitration facility (SCR) through sintering after electric cleaner, main exhauster of sintering, sintering flue gas desulfurization facility, flue gas heat-exchange unit and flue afterburning heat up after collecting, and then cause the main smoke stack emission of sintering by discharged gas fume blower fan after flue gas heat-exchange unit cooling.
Described region 3. scope comprises the bellows of sintering machine postmedian, one's respective area flue gas and region 2. flue gas cause sinter fume denitration facility (SCR) through sintering after electric cleaner, main exhauster of sintering, sintering flue gas desulfurization facility, flue gas heat-exchange unit and flue afterburning heat up after collecting, and then cause the main smoke stack emission of sintering by discharged gas fume blower fan after flue gas heat-exchange unit cooling.
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 bellows in sintering machine afterbody sintering end point region, one's respective area flue gas is through tail multi-tube dust cleaner, by tail flue gas blower fan cause high-temperature flue gas mixing bellows and region 5. flue gas collect and form high temperature mixed flue gas, this flue gas by high-temperature flue gas blower fan cause flue gas heat-exchange unit lower the temperature after with region 2., region flue gas 3. collects, caused by discharged gas fume blower fan and sinter main smoke stack emission.
Described region 5. scope comprises cooler 1 cold section of petticoat pipe flue gas, 1 cold section of upper cover flue gas got by the sintering circular cooler (abbreviation central cooler) generally adopted at present, 1 cold section of flue gas and region 4. high-temperature flue gas are collected at high-temperature flue gas mixing bellows and are formed high temperature mixed flue gas, this flue gas by high-temperature flue gas blower fan cause flue gas heat-exchange unit lower the temperature after with region 2., region flue gas 3. collects, caused by discharged gas fume blower fan and sinter main smoke stack emission.
Described region 6. scope comprises cooler 2 cold sections of petticoat pipe flue gases, 2 cold sections of upper cover flue gases got by the sintering circular cooler (abbreviation central cooler) generally adopted at present, 2 cold sections of flue gases and region 1. flue gas are collected at circulating flue gas mixing bellows and are formed cycling hot flue gas, and this flue gas causes sintering device flue gas circulation cover by circulating flue gas blower fan and carries out flue gas recirculation 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 20%, and 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% ~ 50%, SO in desulphurization denitration section flue gas
2, NO
xconcentration improves about 50%, and the investment of flue gas desulfurization and denitrification appliance arrangement and operation cost can reduce about 40%;
3. flue gas hot gas 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. utilize the pre-thermal denitration flue gas of high-temperature flue gas in sintering circuit to greatest extent, to reduce flue gas intensification burnup, the gas consumption that de-technique heats up entirely of relative flue gas reduces by more than 35%.
Present invention achieves sinter fume segmentation desulphurization denitration Processing tecchnics and flue gas recirculation, hot gas sintering technique and fume afterheat cascade utilization technique carried out organically combine 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-central cooler; 3-coal gas; 4-igniter; 5-sintering device flue gas circulation cover; 6-head multi-tube dust cleaner; 7-head flue gas blower fan; 8-circulating flue gas mixing bellows; 9-circulating flue gas blower fan; 10-sinters electric cleaner; 11-main exhauster of sintering; 12-sintering flue gas desulfurization facility; 13-tail multi-tube dust cleaner; 14-tail flue gas blower fan; 15-high-temperature flue gas mixing bellows; 16-high-temperature flue gas blower fan; 17-flue gas heat-exchange unit; 18-pipeline afterburning heat riser; 19-sinter fume denitration facility (SCR); 20-discharged gas fume blower fan; 21-sinters main chimney; 22-region is (sintering machine head ignition zone comprises No.1 ~ No.3 bellows) 1.; 23-region is (sintering machine middle front part fume treatment region comprises No.4 ~ No.11 bellows) 2.; 24-region is (sintering machine postmedian fume treatment region comprises No.12 ~ No.19 bellows) 3.; 25-region is (sintering machine afterbody smoke-gas area comprises No.20 ~ No.22 bellows) 4.; 26-central cooler 1 cold section of upper cover; 27-central cooler 2 cold sections of upper covers.
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. 22, region 2. 23, region 3. 24, region 4. 25; Described region 1. flue gas to be caused by head flue gas blower fan 7 after circulating flue gas mixing bellows 8 collect with the flue gas of 2 cold sections of upper covers 27 of central cooler 2 through head multi-tube dust cleaner 6 after collecting and causes sintering device flue gas circulation cover 5 by circulating flue gas blower fan 9; 2. described region to heat up laggard sinter fume denitration facility (SCR) 19 through flue gas heat-exchange unit 17 and pipeline afterburning heat riser 18 after sintering electric cleaner 10 and causing sintering flue gas desulfurization facility 12 by main exhauster of sintering 11 with region flue gas 3., and then lowering the temperature through flue gas heat-exchange unit 17 causes the main chimney 21 of sintering by discharged gas fume blower fan 20; Described region 4. flue gas to be caused by tail flue gas blower fan 14 to be caused by high-temperature flue gas blower fan 16 after high-temperature flue gas mixing bellows 15 collect with the flue gas of 1 cold section of upper cover 26 of central cooler 2 to be caused by discharged gas fume blower fan 20 after flue gas heat-exchange unit 17 heat exchange is lowered the temperature through tail multi-tube dust cleaner 13 and sinters main chimney 21;
Embodiment:
With certain 210m
2sintering machine is example, to being described in detail as follows of the environmental protection and energy saving treatment process of a kind of sinter fume of the present invention:
As shown in Figure 1, at a 210m
2on sintering machine 1, after No.1 ~ No.3 bellows flue gas of described region 1. sintering machine head ignition zone is collected through head multi-tube dust cleaner 6 to be caused by head flue gas blower fan 7 circulating flue gas mixing bellows 8 and the flue gas of 2 cold sections of upper covers 27 of central cooler 2 collect form cycling hot flue gas after cause sintering device flue gas circulation cover 5 by circulating flue gas blower fan 9 and carry out flue gas recirculation sintering; No.12 ~ No.19 bellows in 2. No.4 ~ No.11 bellows flue gas of sintering machine central-fore area and region 3. sintering machine postmedian region, described region to be heated up laggard sinter fume denitration facility (SCR) 19 through flue gas heat-exchange unit 17 and pipeline afterburning heat riser 18 after sintering electric cleaner 10 and causing sintering flue gas desulfurization facility 12 by main exhauster of sintering 11, then after flue gas heat-exchange unit 17 is lowered the temperature, causes the outer row of the main chimney 21 of sintering by discharged gas fume blower fan 20; After No.20 ~ No.22 bellows flue gas in 4. sintering machine afterbody high-temperature flue gas region, described region is collected through tail multi-tube dust cleaner 13 to be caused by tail flue gas blower fan 14 high-temperature flue gas mixing bellows 15 and the flue gas of 1 cold section of upper cover 26 of central cooler 2 collect forms high temperature mixed flue gas after to be caused by high-temperature flue gas blower fan 16 to be caused by discharged gas fume blower fan 20 after flue gas heat-exchange unit 17 is lowered the temperature and sinter main chimney 21 and arrange outward; The flue gas of described region 5. 1 cold section of upper cover 26 of central cooler 2 is caused high-temperature flue gas mixing bellows 15 and region 4. flue gas collect and form high temperature mixed flue gas; The flue gas of described region 6. 2 cold sections of upper covers 27 of central cooler 2 is caused circulating flue gas mixing bellows 8 and region flue gas 1. to collect and form cycling hot flue gas;
This embodiment can reduce outer heat extraction exhaust gas volumn about 20%, and 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% ~ 50%, SO in desulphurization denitration section flue gas
2, NO
xconcentration improves about 50%, 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%; Relative to conventional flue-gas denitration process, gas burnup reduces by more than 35%.
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 environmental protection and energy saving treatment process for sinter fume, according to sinter fume SO in sintering process
2, NO
xconcentration is along with O in flue gas
2, CO
xthe Variation Features of concentration, flue-gas temperature, is divided into four regions by sintering machine wind box along chassis traffic direction, adds cooler 1 cold section, 2 cold sections petticoat pipes totally six regions: SO in the flue gas of region 1 simultaneously
2, CO concentration is higher, NO
xconcentration is very low, this part sinter fume and region 6 flue gas is mixed to form cycling hot flue gas and carries out flue gas recirculation sintering; SO in the flue gas of region 2
2concentration is lower, NO
xdense, arrange outside after carrying out dedusting, desulphurization and denitration process after this part sinter fume and region 3 flue gas being collected; SO in the flue gas of region 3
2, NO
xconcentration is all very high, arranges outside after carrying out dedusting, desulphurization and denitration process after this part sinter fume and region 2 flue gas being collected; SO in the flue gas of region 4
2, NO
xconcentration is very low, arranges outside after introducing flue gas heat-exchange unit heat exchange after this part sinter fume and region 5 flue gas are mixed to form high temperature mixed flue gas; Region 5 flue gas is cooler 1 cold section of petticoat pipe flue gas, this part heat smoke and region 4 flue gas is carried out being mixed to form high temperature mixed flue gas, outer row after introducing flue gas heat-exchange unit heat exchange; Region 6 flue gas is cooler 2 cold sections of petticoat pipe flue gases, O in flue gas
2content is close to O in air
2contents level, is mixed to form cycling hot flue gas by this part heat smoke and region 1 flue gas and carries out flue gas recirculation sintering, and the physical sensible heat making full use of flue gas improves fuel availability, reduces sintering solid burnup.
2. technique as claimed in claim 1, is characterized in that according to sinter fume SO in sintering process
2, NO
xconcentration is along with O in flue gas
2, CO
xthe Variation Features of concentration, flue-gas temperature, sintering machine wind box is divided into four regions along chassis traffic direction, flue gas desulfurization and denitrification and cooler part heat smoke is carried out to the selectable segmentation of the sinter fume in these four regions and comprehensively carries out exhaust heat stepped utilization and flue gas recirculation sintering.
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 sintering machine central-fore area, and scope comprises several bellows before in the middle part of sintering machine, flue wind-warm syndrome 100 ~ 110 DEG C; Region 3 is sintering machine postmedian region, 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 high-temperature 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 1 cold section of petticoat pipe, and scope comprises cooler 1 cold section of petticoat pipe heat smoke, flue-gas temperature 350 DEG C ~ 420 DEG C; Region 6 is cooler 2 cold sections of petticoat pipes, and scope comprises cooler 2 cold sections of petticoat pipe heat smoke, flue-gas temperature 280 DEG C ~ 320 DEG C.
4. the technique as described in one of right 1-3, is characterized in that region 1 sinter fume is mixed to form cycling hot flue gas with region 6 cooler 2 cold sections of petticoat pipe heat smoke after multi-tube dust cleaner dedusting carries out flue gas recirculation sintering.Utilize original compound band in sinter bed on the one hand, cross wet bands to SO
2strong adsorption effect, by SO in the sinter fume of region 1
2with SO in region 2, region 3 sinter fume
2carry out enrichment; On the other hand in the sinter fume of region 1, CO concentration is higher, to utilize in sinter bed calcium ferrite to NO
xself catalyzed reduction effect, further reduce NO in region 2, region 3 sinter fume
xconcentration.
5. the technique as described in one of right 1-3, it is characterized in that region 6 cooler 2 cold sections of petticoat pipe heat smoke and region 1 sinter fume are mixed to form cycling hot flue gas carries out flue gas recirculation sintering, the physical sensible heat making full use of heat smoke on the one hand improves fuel availability, reduces sintering solid burnup; On the other hand due to O in this part flue gas
2concentration is greater than 18%, can significantly improve flue gas recirculation sintering effect.
6. the technique as described in one of right 1-3, it is characterized in that region 2, region 3 sinter fume to introduce after sintering electric cleaner dedusting flue gas desulfurization facilities after desulfurization process, to cause flue gas heat-exchange unit heat up, the heat smoke after intensification directly carry out on flue afterburning be warming up to meet SCR denitrating flue gas temperature requirement after introduce denitrating flue gas facility and after denitrating flue gas process, after flue gas heat-exchange unit is lowered the temperature, cause the main chimney of sintering again arrange outward.
7. the technique as described in one of right 1-3, is characterized in that region 4 sinter fume to introduce after multi-tube dust cleaner dedusting and region 5 cooler 1 cold section of petticoat pipe heat smoke are mixed to form high temperature mixed flue gas to cause after flue gas heat-exchange unit carries out heat exchange sintering main chimney and arrange outward.
8. the technique as described in one of right 1-3, is characterized in that cold for cooler 1 section, 2 cold sections petticoat pipe heat smoke separately to utilize, to improve fume afterheat utilization ratio, realizes exhaust heat stepped utilization.
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