CN108645230A - A kind of segmented treatment process of sintering flue gas - Google Patents
A kind of segmented treatment process of sintering flue gas Download PDFInfo
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- CN108645230A CN108645230A CN201810773773.1A CN201810773773A CN108645230A CN 108645230 A CN108645230 A CN 108645230A CN 201810773773 A CN201810773773 A CN 201810773773A CN 108645230 A CN108645230 A CN 108645230A
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- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
A kind of segmented treatment process of sintering flue gas, belongs to that Ferrous Metallurgy is environmentally friendly, energy saving, technical field of emission reduction.Cycle heat smoke is mixed to form with cooler middle-temperature section petticoat pipe flue gas carry out flue gas recirculation sintering after sintering machine tail flue gas is collected after UTILIZATION OF VESIDUAL HEAT IN with head flue gas；Sintering machine middle part flue gas is arranged outside after dedusting, flue gas desulfurization and denitrification integration removing processing；Cooler high temperature section petticoat pipe flue gas is led back into cooler after UTILIZATION OF VESIDUAL HEAT IN as circulating cooling wind；The present invention is realized to the flue gas selectivity segment processing in sintering production, is reduced desulphurization denitration treatment quantity and is improved SO in processing flue gas2、NOXConcentration, realize fume afterheat cascade utilization simultaneously, reduce sintering circuit burnup, reduce whole discharged gas fume amount in sintering production, to reduce the flue gas desulfurization and denitrification in sintering production, the construction investment that fume afterheat utilizes and production run cost, meet environmentally friendly, energy saving, emission reduction, consumption reduction green circulation economy operational mode.
Description
Technical field
The environmentally friendly, energy saving of sintering circuit, technical field of emission reduction in being produced the invention belongs to iron and steel metallurgical industry, are related to one kind
The segmented treatment process of sintering flue gas, and in particular to a kind of desulphurization denitration of sintering flue gas, flue gas recirculation and fume afterheat
The comprehensive processing technique utilized is more particularly to a kind of based on flue gas SO in sintering production2、NOXThe characteristic distributions of concentration, flue gas
A kind of segmented treatment process for sintering flue gas that cycle, fume afterheat utilize.
Background technology
Sintering circuit is one of the main air exhaust emission source in steel and iron industry production, especially SO2、NOXMaximum production
Source of students, there are about 51%~62% SO in steel smelting procedure2And 48% NOXFrom sintering circuit, with China's non-electrical industry cigarette
Gas discharge index it is increasingly strict, the minimum discharge of steel industry transformation is also gradually unfolded.It is different from the past to sintering flue gas
Monotechnics series connection removing mode, sintering flue gas desulfurization denitrification integral removing sulfuldioxide is gradually ripe at present, main active
A variety of dry method such as coke, organic complex, catalysis oxidation, wet method, semidry process approach, relative to being needed after flue gas desulfurization before
Heat up denitration（SCR）Many technologies, one big advantage of integrated removing sulfuldioxide be exactly heat up substantially without flue gas, but simultaneously this
Class technology still takes end flue gas to take off processing mode entirely mostly, since sintering flue gas amount is big, and SO2、NOXEtc. pollutant concentrations
It is relatively low, cause the construction investment of current sintering flue gas integration removing facility and operating cost all very high.
Sinter cooler at present mostly or use high temperature section fume collection UTILIZATION OF VESIDUAL HEAT IN, in, low-temperature zone flue gas it is open
The form of uncontrollable discharge, as the improvement for flue gas uncontrollable discharge in sintering production is brought into schedule, cooler is also gradually
It is changed to complete machine totally enclosed type, thus cooler high temperature section petticoat pipe flue gas（2 cold sections of 1 cold section+part, temperature are about 320 DEG C~450
℃）With cooler middle-temperature section petticoat pipe flue gas（2 cold sections+3 cold sections of part, temperature are about 180 DEG C~280 DEG C）, this part sensible heat is about
Account for the 37.3% of sintering circuit total amount of heat, and the high-temperature flue gas of sintering machine tail portion bellows（Temperature is about 320 DEG C~400 DEG C）, this portion
Sensible heat is divided to account for about the 23.6% of total amount of heat, from high efficiency and the economy point analysis for realizing energy cascade utilization, by this two parts
The comprehensive utilization of fume afterheat step is the developing direction for improving waste heat to greatest extent and efficiently using.
In conclusion sintering flue gas desulfurization denitrification integral removing sulfuldioxide takes end flue gas to take off processing side entirely mostly at present
Formula, equipment take up an area big, construction investment and operating cost height；The waste heat of cooler is also the recycling at single position, is equally made
At various wastes such as construction operation cost, place occupancy.Therefore, it is necessary to special according to the flue gas in sintering production process
Point develops more economical, efficient technology.
Invention content
In view of above-mentioned problems, the present invention has studied in Ore Sintering Process, in different sintering section sintering flue gases
SO2、NOXThe characteristic distributions of concentration, while considering to sintering machine tail portion high-temperature flue gas, cooler high temperature section petticoat pipe and middle-temperature section cigarette
The flue gas of cover takes comprehensive exhaust heat stepped utilization, and then forms the segmented treatment process to flue gas in sintering production.
Therefore, the purpose of the present invention is to provide a kind of segmented treatment process of sintering flue gas, which is that will be sintered
Flue gas segmentation desulphurization denitration Processing tecchnics carry out organic with flue gas recirculation production technology, fume afterheat cascade utilization technique in production
In conjunction with sintering flue gas segmented treatment process, this technique integrally reduces construction investment and production run cost, greatly subtracts
Lack the discharged gas fume amount in sintering production, meets green circulation economy operational mode.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of segmented treatment process of sintering flue gas, according to sintering flue gas SO in sintering production process2、NOXThe distribution of concentration
Sintering machine wind box is divided into 3 regions along trolley traffic direction, while totally enclosed type cooler petticoat pipe is divided into high temperature by feature
Section, middle-temperature section, 3 part of low-temperature zone take 2 high temperature section, middle-temperature section petticoat pipe regions, and totally 5 regions, are described as follows：
Region（Sintering machine head smoke-gas area）, SO in the flue gas of one's respective area2、NOXConcentration is relatively low, by the flue gas of one's respective area with
Region after UTILIZATION OF VESIDUAL HEAT INAfter flue gas collects and regionFlue gas is mixed to form cycle heat smoke, leads to sintering machine cycle cigarette
Gas hood carries out flue gas recirculation sintering.
Region（Sintering machine middle part flue gas region）, SO in the flue gas of one's respective area2、NOXConcentration is higher, simultaneously because by area
DomainWith regionFlue gas lead to one's respective area carry out flue gas recirculation sintering, realize regionWith regionFlue gas in SO2、NOX
With SO in the flue gas of one's respective area2、NOXOuter row after progress flue gas desulfurization and denitrification integration removing after enrichment.
Region（Sintering machine tail portion smoke-gas area）, SO in the flue gas of one's respective area2、NOXConcentration is relatively low and temperature is higher, will
The flue gas of one's respective area after UTILIZATION OF VESIDUAL HEAT IN with regionAfter flue gas collects and regionFlue gas is mixed to form cycle heat smoke, leads to
Sintering machine circulating flue gas cover carries out flue gas recirculation sintering.
Region（Cooler high temperature section petticoat pipe）, the flue gas of one's respective area leads back after UTILIZATION OF VESIDUAL HEAT IN as circulating cooling wind cold
But machine is realized and cools down to sinter step, sinter is avoided to cause pulverization rate to increase because of chilling.
Region（Cooler middle-temperature section petticoat pipe）, O in the flue gas of one's respective area2Content O close in air2Contents level incite somebody to action this
The flue gas in region and region, regionFlue gas be mixed to form cycle heat smoke, lead to sintering machine circulating flue gas cover carry out cigarette
Gas cycle sintering makes full use of the physical sensible heat of this part flue gas, reduces sintering circuit burnup.
The regionRange includes the bellows of sintering machine head ignition zone, the flue gas of one's respective area with after UTILIZATION OF VESIDUAL HEAT IN
RegionFlue gas collects through sintering process deduster, and circulating flue gas mixing bellows are led to by sintering process wind turbine.
The regionRange includes the bellows in the middle part of sintering machine, and the flue gas of one's respective area is through being sintered electric precipitator, sintering master
Sintering smoke stack emission is led to after exhaust fan, flue gas desulfurization and denitrification integration removing facility.
The visual field condition of process choice and practical condition of the flue gas desulfurization and denitrification integration removing, select and live
A variety of dry method, wet method, the semidry process approach such as property coke, organic complex, catalysis oxidation.
The regionRange includes the bellows in sintering machine tail portion high-temperature flue gas region, and the flue gas of one's respective area is through UTILIZATION OF VESIDUAL HEAT IN
Afterwards with regionFlue gas collects through sintering process deduster, and circulating flue gas mixing bellows are led to by sintering process wind turbine.
The regionRange includes cooler high temperature section petticoat pipe flue gas, the sintering circular cooler generally used at present
（Abbreviation ring cold machine）, take 1 cold section of ring cold machine and the petticoat pipe flue gas of 2 cold sections of part as high temperature section petticoat pipe flue gas, more than flue gas warp
Ring cold machine is led back by cooling blower as circulating cooling wind after heat utilization.
The regionRange includes cooler middle-temperature section petticoat pipe flue gas, the sintering circular cooler generally used at present
（Abbreviation ring cold machine）, take the petticoat pipe flue gas of 2 cold sections and 3 cold sections of ring cold machine part as middle-temperature section petticoat pipe flue gas, with region, area
DomainFlue gas be mixed to form cycle heat smoke in circulating flue gas mixing bellows, which leads to sintering machine by circulating flue gas wind turbine
Circulating flue gas cover carries out flue gas recirculation sintering.
RegionThe steam and region that flue gas is generated through UTILIZATION OF VESIDUAL HEAT INThe steam that flue gas is generated through UTILIZATION OF VESIDUAL HEAT IN, can be used for
Cogeneration drags the power source that Sinter air machine is run in technology as vapour.
The Process configuration of the present invention has the following advantages that compared with normal sintering production technology configures：
1. the exhaust gas volumn handled when flue gas desulfurization and denitrification reduces by 30% or so, while SO in flue gas2、NOXIt is left that concentration improves 50%
The right side, corresponding flue gas desulfurization and denitrification facility investment and operating cost can reduce by 30% or so；
2. carrying out exhaust heat stepped utilization to each section flue gas in sintering production to greatest extent, gas burnup can in sintering production
12%~15% is reduced, solid burnup can reduce by 2%~4%；
Whole discharged gas fume amount in sintering production is set to reduce 48% or so 3. the flue gas recirculation of sintering machine, cooler flue gas utilizes.
The present invention is realized sintering flue gas segmentation desulphurization denitration Processing tecchnics and flue gas recirculation production technology, fume afterheat
Environmentally friendly, energy saving, emission reduction the comprehensive processing technique that cascade utilization technique is organically combined, it is whole to reduce construction investment and production
Operating cost is increased economic efficiency, and green circulation economy operational mode is met.
Description of the drawings
Fig. 1 is the process flow diagram of the specific embodiment of the invention 1.
It is marked in figure as follows：1- sintering machines；2- ring cold machines；3- igniters；4- sintering machine circulating flue gas covers；5- sintering machine cigarettes
Gas waste heat utilization facility；6- sintering process dedusters；7- sintering process wind turbines；8- circulating flue gas mixing bellows；9- circulating flue gas
Wind turbine；10- is sintered electric precipitator；11- main exhauster of sintering；12- flue gas desulfurization and denitrification integrations remove facility；13- is sintered cigarette
Chimney；14- ring cold machine fume afterheats utilize facility；15- cooling blowers；The regions 16-（Sintering machine head smoke-gas area）；The areas 17-
Domain（Sintering machine middle part flue gas region）；The regions 18-（Sintering machine tail portion smoke-gas area）；The regions 19-（Ring cold machine high temperature section
Petticoat pipe）；The regions 20-（Ring cold machine middle-temperature section petticoat pipe）.
Specific implementation mode
With reference to the accompanying drawings and examples to the present invention specific implementation mode be described further, but not as
Limit.
As shown in Figure 1, the system comprises：Sintering machine 1, ring cold machine 2, igniter 3, region16, region17, region18, region19, region20；The regionFlue gas and the region after the cooling of sintering device flue gas waste heat utilization facility 5Flue gas through sintering process deduster 6 leads to circulating flue gas mixing bellows 8 and region after collecting by sintering process wind turbine 7Flue gas
Sintering machine circulating flue gas cover 4 is led to by circulating flue gas wind turbine 9 after mixing；The regionFlue gas is through being sintered electric precipitator 10 by burning
Knot main exhauster 11 leads to after flue gas desulfurization and denitrification integration removing facility 12 carries out flue gas desulfurization and denitrification integration removing and leads to
It is sintered outside chimney 13 and arranges；The regionFlue gas through ring cold machine fume afterheat using facility 14 cool down after as circulating cooling wind by
Cooling blower 15 leads back ring cold machine 2.
Embodiment：
By taking 230 ㎡ sintering machines as an example, elaborate to a kind of segmented treatment process of sintering flue gas of the present invention：
As shown in Figure 1, a 230 ㎡ sintering machines 1 have No.1~No.24 totally 24 bellows, by regionSintering machine head flue gas
The flue gas of No.1~No.3 bellows in region and the region after the cooling of sintering device flue gas waste heat utilization facility 5Sintering machine tail portion
The flue gas of No.22~No.24 bellows of smoke-gas area is led to by sintering process wind turbine 7 through sintering process deduster 6 after collecting and is followed
Ring flue gas mixing bellows 8 and regionRing cold machine middle-temperature section petticoat pipe flue gas is mixed to form after cycle heat smoke by circulating flue gas wind turbine
9, which lead to sintering machine circulating flue gas cover 4, carries out flue gas recirculation sintering；By regionThe No.4 in sintering machine middle part flue gas region~
The flue gas of No.21 bellows leads to flue gas desulfurization and denitrification integration removing facility through being sintered electric precipitator 10 by main exhauster of sintering 11
It leads to outside sintering chimney 13 and arranges after 12 progress flue gas desulfurization and denitrification integration removings；By regionRing cold machine high temperature section petticoat pipe flue gas
Ring cold machine 2 is led back by cooling blower 15 as circulating cooling wind after ring cold machine fume afterheat is cooled down using facility 14；By regionRing cold machine middle-temperature section petticoat pipe flue gas leads to circulating flue gas mixing bellows 8 and region, regionFlue gas be mixed to form cycle
Heat smoke leads to sintering machine circulating flue gas cover 4 by circulating flue gas wind turbine 9 and carries out flue gas recirculation sintering.
The embodiment can reduce discharged gas fume amount 48% or so；Exhaust gas volumn when flue gas desulfurization and denitrification processing can reduce by 30% left side
The right side, while SO in flue gas2、NOXConcentration improves 50% or so, and flue gas desulfurization and denitrification facility investment and operating cost can reduce by 30% left side
It is right；Sintering production process gases burnup 12%~15%, solid burnup 2%~4% can be reduced.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can be described
Various deformations or amendments are made in the scope of the claims.
Claims (6)
1. the segmented treatment process of a kind of sintering flue gas, according to sintering flue gas SO in sintering process2、NOXThe distribution of concentration is special
Sintering machine wind box is divided into 3 regions along trolley traffic direction, while taking totally enclosed type cooler high temperature section petticoat pipe, medium temperature by point
Section petticoat pipe this 2 regions, totally 5 regions：SO in 1 flue gas of region2、NOXConcentration is relatively low, by this partial fume and by waste heat profit
After 3 flue gas of region collects and 5 flue gas of region is mixed to form progress flue gas recirculation sintering after cycle heat smoke；2 flue gas of region
Middle SO2、NOXConcentration is higher, this partial fume is dusted, outer row after desulphurization and denitration processing；SO in 3 flue gas of region2、NOX
Concentration is relatively low, and cycling hot cigarette is mixed to form with 5 flue gas of region after this partial fume is collected after UTILIZATION OF VESIDUAL HEAT IN with 1 flue gas of region
Flue gas recirculation sintering is carried out after gas；4 flue gas of region leads back cooler after UTILIZATION OF VESIDUAL HEAT IN as circulating cooling wind；5 flue gas of region
Flue gas recirculation sintering is carried out with region 1, collecting after flue gas is mixed to form cycle heat smoke for region 3.
2. technique as described in claim 1, it is characterised in that according to sintering flue gas SO in sintering process2、NOXThe distribution of concentration
Sintering machine wind box is divided into 3 regions by feature along trolley traffic direction, and flue gas desulfurization is carried out to the flue gas segmentation in this 3 regions
Denitration, flue gas recirculation sintering and fume afterheat utilize.
3. technique as described in claim 1, it is characterised in that by totally enclosed type cooler petticoat pipe be divided into high temperature section, middle-temperature section and
3 part of low-temperature zone takes 2 high temperature section, middle-temperature section petticoat pipe regions, and flue gas recirculation, exhaust heat stepped is carried out to the flue gas in this 2 regions
Comprehensive utilization.
4. the technique as described in one of right 1-3, it is characterised in that by 1 flue gas of region and 3 flue gas of region after UTILIZATION OF VESIDUAL HEAT IN
It is mixed to form cycle heat smoke with 5 flue gas of region after collecting and carries out flue gas recirculation sintering.
5. the technique as described in one of right 1-3, it is characterised in that remove 2 flue gas of region through dedusting, desulfurization and denitrification integral
It leads to outside sintering chimney and arranges after processing.
6. the technique as described in one of right 1-3, it is characterised in that regard 4 flue gas of region as circulating cooling wind after UTILIZATION OF VESIDUAL HEAT IN
Lead back ring cold machine.
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| US20170108275A1 (en) * | 2015-03-27 | 2017-04-20 | Insttute Of Process Engineering, Chinese Academy Of Sciences | Process and system for waste heat grading cyclic utilization and pollutant emission reduction of sintering flue gas |
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2018
- 2018-07-15 CN CN201810773773.1A patent/CN108645230A/en active Pending
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| CN101893384A (en) * | 2009-05-21 | 2010-11-24 | 宝山钢铁股份有限公司 | Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof |
| CN104195326A (en) * | 2014-08-19 | 2014-12-10 | 浙江大学 | Sintering energy-saving technique and system capable of removing multiple pollutants |
| US20170108275A1 (en) * | 2015-03-27 | 2017-04-20 | Insttute Of Process Engineering, Chinese Academy Of Sciences | Process and system for waste heat grading cyclic utilization and pollutant emission reduction of sintering flue gas |
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