CN104764340A - Flue gas circulation system and method for sintering machine flue gas recirculation denitration - Google Patents

Flue gas circulation system and method for sintering machine flue gas recirculation denitration Download PDF

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Publication number
CN104764340A
CN104764340A CN201510173251.4A CN201510173251A CN104764340A CN 104764340 A CN104764340 A CN 104764340A CN 201510173251 A CN201510173251 A CN 201510173251A CN 104764340 A CN104764340 A CN 104764340A
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China
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flue gas
recirculation
denitration
arm
sintering machine
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CN201510173251.4A
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Chinese (zh)
Inventor
宋蔷
付世龙
姚强
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清华大学
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Publication of CN104764340A publication Critical patent/CN104764340A/en

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Abstract

The invention discloses a flue gas circulation system and method for sintering machine flue gas recirculation denitration. The flue gas circulation system is composed of a sintering machine, a branch pipe I, a branch pipe II, regulating valves, a recirculation flue, a recirculation draught fan and a top-suspended flue gas hood. The method comprises the steps that the recirculation draught fan is utilized to extract flue gas in the middle section and the rear section of a wind box of the sintering machine, recirculation flue gas enters the recirculation flue through the branch pipe I and the branch pipe II, enters the top-suspended flue gas hood, and enters a high-temperature combustion zone of a trolley again from the top of the sintering machine, NOx in the flue gas is restored to be N2 through coke, and the NOx is removed. According to the flue gas circulation system and method for the sintering machine flue gas recirculation denitration, on the premise that the combustion mode of the sintering machine and the sinter quality are not changed, the NOx is removed efficiently, the changes to a system are less, the operating cost is low, the operation is simple, convenient and flexible, and the denitration efficiency is high; the flue gas circulation system and method for the sintering machine flue gas recirculation denitration have wide application prospect in the field of sintering machine flue gas denitration.

Description

A kind of smoke circulating system of sintering device flue gas recirculation denitration and method

Technical field

The invention belongs to steel industry atmosphere pollution control technology field, the smoke circulating system of particularly a kind of sintering device flue gas recirculation denitration and method.

Background technology

Sintering deposit is the indispensable raw material in steel manufacture process, and sintering process is one of the main processes during iron and steel is produced.Along with the development of China's steel industry, Sintering Yield increases greatly.But sintering process can produce a large amount of NO x, SO 2with pollutants such as dust, test is proposed to the cleaner production of steel industry and sustainable development.

At present, for sintering machine discharge SO 2wet type desulfurizing equipment and the cleaner of dust put into operation in a large number, achieve reasonable effect.But, for the NO of one of the major pollutants that sintering process produces x, be not also applicable to the practicable removing sulfuldioxide of sintering machine.Therefore, study for sintering process generation NO xcontrol technology imperative.

Existing main flow NO xcontrol technology mainly comprises denitration technology in gas denitrifying technology and burning.Gas denitrifying technology mainly contains SNCR (SNCR) technology and SCR (SCR) technology.SNCR (SNCR) technology is after reducing agent (ammoniacal liquor or urea) is mixed with suitable concentration, spurt in specific temperature range (900 ~ 1100 DEG C), denitration reaction is there is, by NO after reducing agent mixes with flue gas xbe reduced into N 2process.SNCR technological investment is few, cost is low, but requires higher to reaction temperature, only in specific temperature range, just can reach reasonable denitration effect.And the flue-gas temperature of sintering machine outlet is lower, SNCR technology is difficult to reach desirable denitration effect, and easily causes the escaping of ammonia.SCR (SCR) technology is under the effect of catalyst, utilize reducing agent (ammoniacal liquor or urea) by NO xbe reduced into N 2.SNCR technology denitration efficiency is higher, can reach more than 90%.But SNCR technical costs is high, large to the change amount of system, and a large amount of dust of sintering device flue gas easily causes the wearing and tearing of catalyst and poisoning.Therefore, existing gas denitrifying technology is difficult to be suitable in sintering machine.

In burning, denitration technology mainly comprises low-NO_x combustion technology, fractional combustion and flue gas recirculation etc.Low-NO_x combustion technology, by distributing the ratio of fuel and air in burner, realizes oxidation and the reducing atmosphere of burner local; Grading combustion technology is then form oxygen deprivation and oxygen-enriched atmosphere by the distribution of fuel and air, reaches and removes NO xobject.Low nitrogen burning and grading combustion technology all need to change combustion system.But be limited to the special combustion system of sintering machine and the quality in order to ensure sintering deposit, low nitrogen burning and grading combustion technology are not adapted at applying in sintering machine.

Summary of the invention

The object of the invention is to, overcome above-mentioned the deficiencies in the prior art, the smoke circulating system providing a kind of sintering device flue gas to recycle denitration and method.

The technical scheme adopted is:

By arranging smoke circulating system on sintering machine, realize the recirculation denitration of flue gas.Sintering machine is wherein ripe prior art, and it is made up of shop fixtures hopper, mixing container, ignition furnace, holding furnace, chassis, leading portion bellows, stage casing bellows, back segment bellows, large flue, deduster, air-introduced machine and chimney.Running is: grate-layer material and compound are laid on chassis by shop fixtures hopper and mixing container respectively, burn on chassis after ignition furnace igniting and holding furnace insulation, the flue gas produced enters large flue through leading portion bellows, stage casing bellows and back segment bellows respectively, then, after entering deduster dedusting, extract through air-introduced machine and enter air by smoke stack emission.

A smoke circulating system for sintering device flue gas recirculation denitration, is made up of sintering machine, arm one, arm two, control valve, recirculating gas duct, recirculation blower and top suspension flue gas cover; The pipeline that sintering machine stage casing bellows and back segment bellows are connected with large flue arranges arm one and arm two respectively, arm one and arm two arrange control valve, arm one is connected with recirculating gas duct respectively with arm two, recirculating gas duct arranges recirculation blower, recirculating gas duct is connected with top suspension flue gas cover, edge on the chassis that top suspension flue gas cover is horizontally placed on sintering machine.

Utilize the sintering device flue gas recirculation method of denitration of above-mentioned smoke circulating system, recirculation blower is utilized to extract the flue gas of sintering machine stage casing bellows and back segment bellows, by the flow of governor valve control flue gas recycled, flue gas recycled enters recirculating gas duct through arm one and arm two, then top suspension flue gas cover is entered, again the high temperature combustion zone chassis is passed into from sintering machine top, the NO in flue gas by top suspension flue gas cover xbe restored by coke as N 2, thus remove NO x.

The internal circulating load of described flue gas recycled is account for flue gas cumulative volume 0 ~ 60%.

Described coke is produced by the coal-fired devolatilization in high temperature combustion zone.

Describedly remove NO xflue gas enter large flue after, through air-introduced machine extract enter air by smoke stack emission.

Beneficial effect of the present invention:

(1) smoke circulating system of the present invention is under the prerequisite of the combustion system and sinter quality that do not change sintering machine, realizes NO xefficient removal.

(2) change of the present invention to system is little, has the feature of the low and convenient and flexible operation of operating cost.

(3) the present invention can regulate the internal circulating load of flue gas, and realizes the UTILIZATION OF VESIDUAL HEAT IN of flue gas, reduces sintering process energy consumption.

(4) method denitration efficiency of the present invention is high, is with a wide range of applications in sintering device flue gas denitration field.

Accompanying drawing explanation

Fig. 1 is the smoke circulating system schematic diagram of sintering device flue gas of the present invention recirculation denitration.

Number in the figure: 1-shop fixtures hopper; 2-mixing container; 3-ignition furnace; 4-holding furnace; 5-chassis; 6-leading portion bellows; 7-stage casing bellows; 8-back segment bellows; 9-arm one; 10-arm two; 11-control valve; 12-recirculating gas duct; 13-recirculation blower; 14-top suspension flue gas cover; 15-large flue; 16-deduster; 17-air-introduced machine; 18-chimney.

Detailed description of the invention

Below in conjunction with specific embodiments and the drawings, the present invention will be further described.

The smoke circulating system of sintering device flue gas recirculation denitration of the present invention as shown in Figure 1, is made up of sintering machine, arm 1, arm 2 10, control valve 11, recirculating gas duct 12, recirculation blower 13 and top suspension flue gas cover 14; The pipeline that sintering machine stage casing bellows 7 and back segment bellows 8 are connected with large flue 15 arranges arm 1 and arm 2 10 respectively, arm 1 and arm 2 10 arrange control valve 11, arm 1 is connected with recirculating gas duct 12 respectively with arm 2 10, recirculating gas duct 12 is arranged recirculation blower 13, recirculating gas duct 12 is connected with top suspension flue gas cover 14, edge on the chassis 5 that top suspension flue gas cover 14 is horizontally placed on sintering machine.

The denitrification process of above-mentioned smoke circulating system is: grate-layer material and compound are laid on chassis 5 by shop fixtures hopper 1 and mixing container 2 respectively, burns after ignition furnace 3 is lighted a fire and holding furnace 4 is incubated on chassis 5; The flue gas produced enters leading portion bellows 6, stage casing bellows 7 and back segment bellows 8 respectively; A flue gas part in stage casing bellows 7 and back segment bellows 8 enters large flue 15, and a part extracts through recirculation blower 13 and enters recirculating gas duct 12 by arm 1 and arm 2 10, and the flow of flue gas recycled is controlled by control valve 11; Flue gas in recirculating gas duct 12 passes into the high temperature combustion zone on chassis 5 again through top suspension fan housing 14, the NO in flue gas xreact with coke and be reduced into N 2, thus remove NO x; Flue gas after denitration enters large flue 15 through leading portion bellows 6, stage casing bellows 7 and back segment bellows 8, after then entering deduster 16 dedusting, extracts drain into air by chimney 18 through air-introduced machine 17.

Denitration reaction of the present invention betides the high temperature combustion zone of sintering machine, NO xhigher with the coke required temperature that reacts, be difficult to reach under low temperature and remove NO xeffect.In sintering device handpiece position, Sinter Blending Process material is in the stage of dehydrating, and material layer temperature is relatively low, and fuel does not remove devolatilization completely, and the coke ratio that can participate in reduction reaction is less; The burning of rear of sintering machine position completely, can participate in reductive NO xcoke substantially exhaust.

The present invention extracts NO simultaneously xthe sintering machine stage casing flue gas that concentration is higher and oxygen content and the higher tail flue gas of temperature, oxygen content is high on the one hand for mixed flue gas, and the normal combustion not affecting sintering breeze during recirculation is smelted, and ensures that operating mode is stable; On the other hand, the rising of circulating flue gas temperature, is conducive to the preheated burning of breeze, effectively can save fuel.

The internal circulating load of flue gas recycled of the present invention can according to the flue-gas temperature of the operating mode of sintering machine and large flue, and regulated in real time by control valve, excursion is 0 ~ 60%.If NO in sintering device flue gas xconcentration is lower, or using smoke from big gas duct temperature is down to below dew point, then reduce the internal circulating load of flue gas, prevents smoke condensation to the corrosion of large flue and deduster; If NO in sintering device flue gas xconcentration is higher, or using smoke from big gas duct temperature higher than dew point time, then increase the internal circulating load of flue gas.

The present invention adopts top suspension flue gas cover structure, and along horizontally disposed on chassis of fitting, because the chassis of sintering machine is in mobile status all the time, so flue gas recycled is when passing in the middle part of sintering machine, while not affecting chassis walking, the maximum return amount of flue gas recycled can be ensured.

Embodiment 1

Utilize a sintering device flue gas recirculation method of denitration for smoke circulating system, be implemented on certain 360m 2continuous pallettype sintering machine.Denitrification process is as follows: grate-layer material and compound are laid on chassis 5 by shop fixtures hopper 1 and mixing container 2 respectively, burns after ignition furnace 3 is lighted a fire and holding furnace 4 is incubated on chassis 5; The flue gas produced enters leading portion bellows 6, stage casing bellows 7 and back segment bellows 8 respectively; A flue gas part in stage casing bellows 7 (flue-gas temperature is about 150 DEG C) and back segment bellows 8 (flue-gas temperature is about 400 DEG C) enters large flue 15, a part extracts through recirculation blower 13 and enters recirculating gas duct 12 by arm 1 and arm 2 10, the flow of flue gas recycled is controlled by control valve 11, internal circulating load is account for flue gas cumulative volume 40%, the flue gas of stage casing bellows 7 and back segment bellows 8 is about 250 DEG C, NO in the mixed flue-gas temperature of recirculating gas duct 12 xconcentration is 300mg/m 3; Flue gas in recirculating gas duct 12 passes into the high temperature combustion zone on chassis 5 again through top suspension fan housing 14, the NO in flue gas xthe coke produced with the coal-fired devolatilization in high temperature combustion zone reacts and is reduced into N 2, thus remove NO x; Flue gas after denitration enters large flue 15 through leading portion bellows 6, stage casing bellows 7 and back segment bellows 8, after then entering deduster 16 dedusting, extracts drain into air by chimney 18 through air-introduced machine 17.

Above-mentionedly enter NO in the flue gas of air xconcentration be 105mg/m 3, denitration efficiency is 65%, and this smoke circulating system under the prerequisite of the combustion system and sinter quality that do not change sintering machine, can realize NO xefficient removal, simultaneously can according to NO in flue gas xconcentration and using smoke from big gas duct temperature, regulate the internal circulating load of flue gas, ensures the stable operation of sintering machine and dust pelletizing system, can also make full use of fume afterheat, preheating material, saves fuel.

Claims (5)

1. a smoke circulating system for sintering device flue gas recirculation denitration, is characterized in that, be made up of sintering machine, arm one, arm two, control valve, recirculating gas duct, recirculation blower and top suspension flue gas cover; The pipeline that sintering machine stage casing bellows and back segment bellows are connected with large flue arranges arm one and arm two respectively, arm one and arm two arrange control valve, arm one is connected with recirculating gas duct respectively with arm two, recirculating gas duct arranges recirculation blower, recirculating gas duct is connected with top suspension flue gas cover, edge on the chassis that top suspension flue gas cover is horizontally placed on sintering machine.
2. utilize the sintering device flue gas recirculation method of denitration of the smoke circulating system described in claim 1, it is characterized in that, recirculation blower is utilized to extract the flue gas of sintering machine stage casing bellows and back segment bellows, by the flow of governor valve control flue gas recycled, flue gas recycled enters recirculating gas duct through arm one and arm two, then enter top suspension flue gas cover, again to be passed into the high temperature combustion zone chassis from sintering machine top by top suspension flue gas cover, the NO in flue gas xbe restored by coke as N 2, thus remove NO x.
3. sintering device flue gas recirculation method of denitration according to claim 2, it is characterized in that, the internal circulating load of described flue gas recycled is account for flue gas cumulative volume 0 ~ 60%.
4. sintering device flue gas recirculation method of denitration according to claim 2, is characterized in that, described coke is produced by the coal-fired devolatilization in high temperature combustion zone.
5. sintering device flue gas according to claim 2 recirculation method of denitration, is characterized in that, described in remove NO xflue gas enter large flue after, through air-introduced machine extract enter air by smoke stack emission.
CN201510173251.4A 2015-04-13 2015-04-13 Flue gas circulation system and method for sintering machine flue gas recirculation denitration CN104764340A (en)

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Cited By (16)

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Publication number Priority date Publication date Assignee Title
CN105674290A (en) * 2016-01-15 2016-06-15 重庆盎瑞悦科技有限公司 Method for circulating flue gas to form multi-stage secondary combustion chamber for incineration disposal of solid waste flue gas and sintering machine
CN106288831A (en) * 2016-08-30 2017-01-04 中冶华天工程技术有限公司 A kind of pair takes wind single channel sintering circular-cooler waste heat boiler and takes wind flow flexible measurement method
CN106288832A (en) * 2016-08-30 2017-01-04 中冶华天工程技术有限公司 A kind of pair takes wind dual pathways sintering circular-cooler waste heat boiler and takes wind flow flexible measurement method
CN106323020A (en) * 2016-08-30 2017-01-11 中冶华天工程技术有限公司 Wind pickup flow measuring method for double-pickup single-channel sintering circular cooler waste heat boiler
CN106323019A (en) * 2016-08-30 2017-01-11 中冶华天工程技术有限公司 Wind pickup flow soft-measuring method for double-pickup single-channel sintering circular cooler waste heat boiler
CN106403632A (en) * 2016-08-30 2017-02-15 中冶华天工程技术有限公司 Measurement method for air taking flow of dual-air taking single-channel sinter ring cold machine waste heat boiler
CN106403631A (en) * 2016-08-30 2017-02-15 中冶华天工程技术有限公司 Measuring method for air intake flow of waste heat boiler of double-air-intake double-channel sintering ring cooler
CN107051202A (en) * 2017-06-13 2017-08-18 武汉钢铁有限公司 Sinter flue gas section cyclic coupling flue dust self-catalysis denitrating system
CN107081063A (en) * 2017-06-13 2017-08-22 武汉钢铁有限公司 Sinter the sintering process denitrating system of flue gas recirculation
CN107166971A (en) * 2017-06-13 2017-09-15 武汉钢铁有限公司 Sinter the low NO of flue gas recirculationxDischarge technology
CN107198962A (en) * 2017-06-13 2017-09-26 武汉钢铁有限公司 A kind of be coupled utilizes the sintering flue dust self-catalysis denitrating system for sintering flue dust waste heat
CN107238297A (en) * 2017-06-13 2017-10-10 武汉科技大学 Sinter flue gas sub-prime directed circulation and online denitrating system
CN107413193A (en) * 2017-06-13 2017-12-01 武汉钢铁有限公司 One kind sintering flue gas section cyclic flue dust catalytic denitration technique
KR20180086701A (en) * 2017-01-23 2018-08-01 주식회사 포스코 Apparatus for manufacturing sintered ore and method thereof
KR20180086702A (en) * 2017-01-23 2018-08-01 주식회사 포스코 Apparatus for manufacturing sintered ore and method thereof
CN110608618A (en) * 2019-10-14 2019-12-24 中国科学院过程工程研究所 External support type sintering flue gas circulation sealing device and stacking method thereof

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CN105674290B (en) * 2016-01-15 2017-12-08 重庆盎瑞悦科技有限公司 A kind of method and sintering machine that flue gas recirculation is formed to multistage dual firing chamber's burning disposal solid waste flue gas
CN105674290A (en) * 2016-01-15 2016-06-15 重庆盎瑞悦科技有限公司 Method for circulating flue gas to form multi-stage secondary combustion chamber for incineration disposal of solid waste flue gas and sintering machine
CN106288831A (en) * 2016-08-30 2017-01-04 中冶华天工程技术有限公司 A kind of pair takes wind single channel sintering circular-cooler waste heat boiler and takes wind flow flexible measurement method
CN106288832A (en) * 2016-08-30 2017-01-04 中冶华天工程技术有限公司 A kind of pair takes wind dual pathways sintering circular-cooler waste heat boiler and takes wind flow flexible measurement method
CN106323020A (en) * 2016-08-30 2017-01-11 中冶华天工程技术有限公司 Wind pickup flow measuring method for double-pickup single-channel sintering circular cooler waste heat boiler
CN106403632A (en) * 2016-08-30 2017-02-15 中冶华天工程技术有限公司 Measurement method for air taking flow of dual-air taking single-channel sinter ring cold machine waste heat boiler
CN106403631A (en) * 2016-08-30 2017-02-15 中冶华天工程技术有限公司 Measuring method for air intake flow of waste heat boiler of double-air-intake double-channel sintering ring cooler
CN106323019A (en) * 2016-08-30 2017-01-11 中冶华天工程技术有限公司 Wind pickup flow soft-measuring method for double-pickup single-channel sintering circular cooler waste heat boiler
KR101892147B1 (en) 2017-01-23 2018-08-27 주식회사 포스코 Apparatus for manufacturing sintered ore and method thereof
KR101892148B1 (en) 2017-01-23 2018-08-27 주식회사 포스코 Apparatus for manufacturing sintered ore and method thereof
KR20180086702A (en) * 2017-01-23 2018-08-01 주식회사 포스코 Apparatus for manufacturing sintered ore and method thereof
KR20180086701A (en) * 2017-01-23 2018-08-01 주식회사 포스코 Apparatus for manufacturing sintered ore and method thereof
CN107198962A (en) * 2017-06-13 2017-09-26 武汉钢铁有限公司 A kind of be coupled utilizes the sintering flue dust self-catalysis denitrating system for sintering flue dust waste heat
CN107413193A (en) * 2017-06-13 2017-12-01 武汉钢铁有限公司 One kind sintering flue gas section cyclic flue dust catalytic denitration technique
CN107238297A (en) * 2017-06-13 2017-10-10 武汉科技大学 Sinter flue gas sub-prime directed circulation and online denitrating system
CN107166971A (en) * 2017-06-13 2017-09-15 武汉钢铁有限公司 Sinter the low NO of flue gas recirculationxDischarge technology
CN107081063A (en) * 2017-06-13 2017-08-22 武汉钢铁有限公司 Sinter the sintering process denitrating system of flue gas recirculation
CN107051202A (en) * 2017-06-13 2017-08-18 武汉钢铁有限公司 Sinter flue gas section cyclic coupling flue dust self-catalysis denitrating system
CN107166971B (en) * 2017-06-13 2019-04-19 武汉钢铁有限公司 Sintering flue gas recycles low NOxDischarge technology
CN107081063B (en) * 2017-06-13 2020-06-02 武汉钢铁有限公司 Sintering process denitration system with sintering flue gas circulation
CN110608618A (en) * 2019-10-14 2019-12-24 中国科学院过程工程研究所 External support type sintering flue gas circulation sealing device and stacking method thereof

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