CN108159861A - A kind of Whole Process Control reduces the method and its device of sintering flue gas NOx emission - Google Patents

A kind of Whole Process Control reduces the method and its device of sintering flue gas NOx emission Download PDF

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Publication number
CN108159861A
CN108159861A CN201711364224.0A CN201711364224A CN108159861A CN 108159861 A CN108159861 A CN 108159861A CN 201711364224 A CN201711364224 A CN 201711364224A CN 108159861 A CN108159861 A CN 108159861A
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flue gas
flue
sintering
tail
nox
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Inventor
甘敏
范晓慧
季志云
陈许玲
姜涛
李光辉
袁礼顺
吕薇
汪国靖
王英坡
姚佳文
黄柱成
杨永斌
郭宇峰
张元波
李骞
朱忠平
许斌
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Central South University
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Central South University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76Gas phase processes, e.g. by using aerosols
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2062Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/102Carbon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The present invention provides the methods and its device that a kind of Whole Process Control reduces sintering flue gas NOx emission.This method includes the following steps:Fuel is pre-processed first, then fuel sintering region is divided by head, middle part V1, middle part V2, middle tail portion and tail portion according to sintering machine length direction, the corresponding flue gas generated of fuel sintering is respectively head flue gas, middle part V1 flue gases, middle part V2 flue gases, middle tail flue gas and tail flue gas, middle part V1 flue gases and tail flue gas are circulated again into sintering process, remaining flue gas is subjected to active carbon desulfurization denitration process, flue gas is purified and is passed through chimney and discharged.The process control of this method organic coupling, flue gas recirculation and active carbon purifying technique, by whole-process control by NOx emission concentration from 250~400mg/Nm3It is reduced to 100mg/Nm3Hereinafter, realizing NOx efficient emission-reducings, the cost of investment of denitrating flue gas is effectively reduced, reduces fume treatment operating cost.

Description

A kind of Whole Process Control reduces the method and its device of sintering flue gas NOx emission
Technical field
The invention belongs to Ferrous Metallurgy SINTERING TECHNOLOGY fields more particularly to a kind of Whole Process Control to reduce sintering flue gas The method and its device of NOx emission.
Background technology
NOx (nitrogen oxides) is one of current main atmosphere pollution, is not only directly detrimental to health and ecosystem System also causes the pollution of the composite airs such as acid rain, haze weather, photochemical fog to aggravate.The discharge of NOx in steel industry exhaust gas Amount accounts for 10% or so of the whole nation, and wherein sintering circuit is one of main source for generating NOx, accounts for iron and steel enterprise's total release 48%.
As country is to the increasingly strict of environmental requirement, in June, 2017, State Ministry of Environmental Protection issued《Steel sintering, pelletizing Industrial air pollution object discharge standard》Revision bulletin, further reduced the emission limit of pollutant, nitrogen oxides limit value tune Whole is 100mg/Nm3, the technical difficulty and requirement of denitrating flue gas are significantly increased.Since sintering flue gas temperature is only 100 DEG C~200 DEG C, it is difficult to reach the minimum temperature (300~350 DEG C) needed for the reaction of SCR methods, thus in other field application more Application of the ripe SCR methods in sintering flue gas denitration field is also seldom.Only flue gas is increased to 280 DEG C of progress SCR by Baosteel at present Method denitration, but if to reach 100mg/Nm3Concentration of emission, need further to be promoted temperature to improve denitration rate, this will lead Enable consumption continues to increase.Activated carbon synchronized desulfuring and denitrifying technology has successful application in sintering art, but single-stage denitrating tower is still difficult Reach 100mg/Nm3Emission request, investment and operating cost will be dramatically increased using multi-stage column.
Current NOx abatement technology only considers to reduce NOx emission, can not meet increasingly strict from one-sided NOx emission requirement.Therefore, exploitation organically combines the NOx abatement method of process control and end treatment, arrives NOx reduction 100mg/Nm3Discharge standard hereinafter, significant to steel clean manufacturing.
Invention content
The technical problems to be solved by the invention are to overcome the shortcomings of to mention in background above technology and defect, for NOx A concentration of 250~400mg/Nm3Sintering flue gas, a kind of method that Whole Process Control reduces sintering flue gas NOx emission is provided, should Method economy, efficiently, mainly by inhibiting NOx generations, selective circulating flue gas, the synthesis control of active carbon desulfurization denitration overall process System, 100mg/Nm is economically reduced to by NOx3Hereinafter, meet country's revision in 2017《Steel sintering, pelletizing industrial atmosphere Pollutant emission standard》Concentration requirement, while also provide implement this method device.
In order to solve the above technical problems, technical solution proposed by the present invention is:
A kind of method that Whole Process Control reduces sintering flue gas NOx emission, includes the following steps:
Carrying out pretreatment to fuel first makes fuel surface adhere to milk of lime, then according to sintering machine length direction by fuel Sintering region is divided into head, middle part V1, middle part V2, middle tail portion and tail portion, and fuel is sintered the flue gas of corresponding generation in each region Respectively head flue gas, middle part V1 flue gases, middle part V2 flue gases, middle tail flue gas and tail flue gas, by middle part V1 flue gases and tail portion Flue gas is circulated again into as circulating flue gas in sintering process, and head flue gas, middle part V2 flue gases and middle tail flue gas are lived Property the processing of charcoal desulphurization denitration, be purified flue gas, purified flue gas is passed through chimney and is discharged.
Technical scheme of the present invention, technical concept is ingenious, by cohesive process control with end treatment to agglomeration for iron mine The discharge of NOx is controlled comprehensively in the process;The generation for reducing sintering process NOx by carrying out pretreatment to fuel first, drop Low stain object handles task;Then by flue gas recirculation, treatment quantity is reduced, and degradation NOx is maximized in cyclic process, into One step mitigates the task that follow-up NOx is administered;Finally by active carbon absorption technology, under the optimal conditions of active carbon purifying technique The property of the non-circulating flue gas of regulation and control, realizes effective integrated desulphurization denitration.
Above-mentioned method, it is preferred that the head, middle part V1, middle part V2, middle tail portion, tail portion are sintered region in sintering machine In length accounting be 2~3:4~6:6~8:4~6:2~4.
Above-mentioned method, it is preferred that the head flue gas is low temperature, the flue gas of low vapor, and temperature is 50~70 DEG C, Water vapour content is less than 8%;The middle part V1 flue gases and middle part V2 flue gases are referred to as middle part flue gas, and the middle part flue gas is height NOx, high water vapor, low temperature flue gas, temperature is 50~70 DEG C, and water vapour content is 8~20%, NOx content for 250~ 400mg/Nm3;The middle tail flue gas is high SO2, high pollution object flue gas, SO2Content is 500~3000mg/Nm3;It is described Tail flue gas is high temperature, high O2Flue gas, temperature be 250~500 DEG C, O2Content is more than 19%.
Above-mentioned method, it is preferred that the pretreatment includes operating procedure in detail below:It is 50~60% stones by solid content Grey whey liquid is injected in solid fuel, and it is 2 to control the mass ratio of fuel and CaO:1~3:1, lime is made under the action of stirring Breast is adhered to the surface of fuel.
Above-mentioned method, it is preferred that the circulating flue gas is circulated again into sintering process and is referred to, first by circulating flue gas Mixed gas need to be hybridly prepared into air, then again imports mixed gas in the cycle petticoat pipe of sintering machine charge level.
Above-mentioned method, it is preferred that O in the mixed gas2Content is more than 16%.
Above-mentioned method, it is preferred that the active carbon desulfurization denitration process includes the following steps:It is taken off first using electric precipitation Except the particulate matter in flue gas, it is 130~150 DEG C to maintain flue-gas temperature, and then flue gas is passed through in activated carbon adsorber and is taken off Sulphur denitration process sprays into ammonia in flue gas, controls NH3Molar ratio with NOx is 0.5~0.7.
Above-mentioned method, it is preferred that after the active carbon absorption technology carries out desulphurization denitration processing in the outer flue gas arranged, The equivalent concentration of NOx is less than 100mg/Nm3, the equivalent concentration be 16%~17% oxygen equivalent under the conditions of NOx concentration, equivalent The computational methods of concentration are:
In formula,For the equivalent concentration of NOx, unit mg/Nm3;βO2For the actual concentrations of oxygen in flue gas, unit For %;For the actual concentrations of NOx in flue gas, unit mg/Nm3
The inventive concept total as one implements above-mentioned Whole Process Control reduction sintering flue gas the present invention also provides a kind of The device of the method for NOx emission, including raw materials for sintering storehouse, sintering machine and activated carbon adsorber, the sintering zone in the sintering machine Domain is divided into head, middle part V1, middle part V2, middle tail portion and tail portion according to the length direction of sintering machine, and the bottom of sintering machine corresponds to peace Head flue, middle part V1 flues, middle part V2 flues, middle back-end ductwork and back-end ductwork are filled, the top of sintering machine is sintering fabric, The sintering fabric is ignited cover, insulation cover, cycle petticoat pipe and all covers successively;The middle part V1 flues and back-end ductwork and One flue connects, and one end of first flue is connect with cycle petticoat pipe, is connected on first flue Air inducting device;The head flue, middle part V2 flues, middle back-end ductwork are connected with the second flue, second flue gas One end of pipeline is connect with activated carbon adsorber, and electric precipitator is connected on second flue.
Compared with prior art, the advantage of the invention is that:
(1) the NOx abatements methods such as method of the invention, coupling fuel pretreatment, flue gas recirculation, active carbon absorption technology, Whole Process Control is carried out to flue gas NOx emission reduction, compared to traditional completely using the technology of end purification, process control embodies :1. reducing the generation of sintering process NOx, pollutant process task is reduced;2. by flue gas recirculation, treatment quantity is reduced, And degradation NOx is maximized in cyclic process, further mitigate the task that follow-up NOx is administered;3. by flue gas recirculation technique, regulation and control The property of non-circulating flue gas meets the optimal conditions of active carbon purifying, realizes effective integrated desulphurization denitration.
(2) present invention reduces by 10~25% NOx emission in fuel combustion process, and being sintered again by flue gas recirculation makes 12~20% NOx is degraded, and in flue gas 50~70% NOx is further removed with reference to active carbon absorption technology, finally It realizes NOx from 250~400mg/Nm3It is reduced to 100mg/Nm3Hereinafter, meeting the strict demand of New emission standard, solve and adopt It is difficult to single NOx control technologies by sintering flue gas NOx reduction to 100mg/Nm3Problem.
(3) method of the invention, organic the advantages of having planned as a whole process control, flue gas recirculation and active carbon purifying, in NOx high On the basis of imitating emission reduction, the cost of investment 25~35% of denitrating flue gas is effectively reduced, operating cost 30~45% is reduced, realizes Efficient, the economic emission reduction of sintering flue gas NOx.
(4) the device of the invention is simple in structure, simple operation, investment and operating cost it is low, it is easy to accomplish NOx's efficiently subtracts Row, suitable for commercial Application.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention Some embodiments, for those of ordinary skill in the art, without creative efforts, can also basis These attached drawings obtain other attached drawings.
Fig. 1 is the knot for the device for implementing the method that Whole Process Control reduces sintering flue gas NOx emission in the embodiment of the present invention 1 Structure schematic diagram.
Marginal data:
1st, raw materials for sintering storehouse;2nd, igniting cover;3rd, insulation cover;4th, petticoat pipe is recycled;5th, the first flue;6th, sintering machine;7、 Head flue;8th, middle part V1 flues;9th, middle part V2 flues;10th, middle back-end ductwork;11st, back-end ductwork;12nd, electric precipitator;13、 Activated carbon adsorber;14th, the second flue;15th, air inducting device.
Specific embodiment
For the ease of understanding the present invention, done more entirely below in conjunction with Figure of description and preferred embodiment to inventing herein Face meticulously describes, but protection scope of the present invention is not limited to specific examples below.
Unless otherwise defined, all technical terms used hereinafter are generally understood meaning phase with those skilled in the art Together.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention's Protection domain.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city Field is commercially available or can be prepared by existing method.
Embodiment 1:
A kind of Whole Process Control for implementing the present invention reduces the device of the method for sintering flue gas NOx emission, the knot of the device Structure schematic diagram is as shown in Figure 1, including raw materials for sintering storehouse 1, sintering machine 6 and activated carbon adsorber 13, the sintering region in sintering machine 6 Head, middle part V1, middle part V2, middle tail portion and tail portion are divided into according to the length direction of sintering machine, the bottom of sintering machine 6 corresponds to installation Head flue 7, middle part V1 flues 8, middle part V2 flues 9, middle back-end ductwork 10 and back-end ductwork 11, the top of sintering machine 6 is burns Junction material;Sintering fabric be ignited cover 2, insulation cover 3, cycle petticoat pipe 4 successively all covering, wherein igniting cover 2, insulation cover 3, follow Length accounting of the ring petticoat pipe 4 in sintering machine charge level is 3:5:16;;11 and first fume pipe of middle part V1 flues 8 and back-end ductwork Road 5 connects, and one end of the first flue 5 is connect with cycle petticoat pipe 4, and air inducting device 15 is connected on the first flue 5; Head flue 7, middle part V2 flues 9, middle back-end ductwork 10 are connected with the second flue 14, one end of the second flue 14 with Activated carbon adsorber 13 connects, and electric precipitator 12 is connected on the second flue 14.
A kind of method that Whole Process Control reduction sintering flue gas NOx emission is carried out using above-mentioned device, including following step Suddenly:
(1) first the milk of lime slurries that solid content is 55% are injected in solid fuel, control fuel and the mass ratio of CaO It is 2.5, milk of lime is made to be adhered to the surface of fuel under the action of stirring;Pretreated fuel is added in into raw materials for sintering storehouse 1 In pelletize, then flow into sintering machine 6 in be sintered.
(2) fuel sintering region is divided into head, middle part V1, middle part V2, middle tail portion and tail according to sintering machine length direction Portion, head, middle part V1, middle part V2, middle tail portion, tail portion are 3 in the length accounting that sintering machine is sintered in region:6:8:6:3, fuel Be sintered in each region the corresponding flue gas generated be respectively head flue gas, middle part V1 flue gases, middle part V2 flue gases, middle tail flue gas and Tail flue gas;The temperature of head flue gas is 50~70 DEG C, and water vapour content is less than 8%;The temperature of middle part V1 flue gases is 50~70 DEG C, water vapour content is 8~20%, and NOx content is 250~400mg/Nm3;The temperature of middle part V2 flue gases is 50~70 DEG C, water Vapor content is 8~20%, and NOx content is 250~400mg/Nm3;SO in middle tail flue gas2Content is 500~3000mg/ Nm3;The temperature of tail flue gas is 250~500 DEG C, O2Content is more than 19%.
(3) middle part V1 flue gases and tail flue gas enter the first flue 5 by middle part V1 flues and back-end ductwork respectively In, middle part V1 flue gases and tail flue gas are as circulating flue gas, the sky in the first flue 5 with being imported by air inducting device 15 Gas is hybridly prepared into O2Content is more than 16% mixed gas, then imports following for sintering machine charge level by the first flue 5 again In ring petticoat pipe 4, so that circulating flue gas is circulated again into sintering process.
(4) head flue gas, middle part V2 flue gases and middle tail flue gas pass through head flue, middle part V2 flues, middle tail portion respectively Flue enters the second flue 14, and the particle removed in electric precipitator 12 in flue gas is introduced by the second flue 14 Object, it is 140 DEG C then to maintain flue-gas temperature, then enters progress activated carbon in activated carbon adsorber 13 through the second flue 14 and take off Sulphur denitration process sprays into ammonia in flue gas, controls NH3Molar ratio with NOx is 0.6, is purified flue gas, purified cigarette Gas is passed through chimney and is discharged.
Under the conditions of 16% oxygen equivalent, the equivalent concentration of NOx emission is less than 100mg/Nm3, and realize reduction denitrating flue gas Cost of investment 30% reduces operating cost 40%.

Claims (10)

1. a kind of method that Whole Process Control reduces sintering flue gas NOx emission, which is characterized in that include the following steps:
Carrying out pretreatment to fuel first makes fuel surface adhere to milk of lime, is then sintered fuel according to sintering machine length direction Region is divided into head, middle part V1, middle part V2, middle tail portion and tail portion, and fuel is sintered the flue gas difference of corresponding generation in each region For head flue gas, middle part V1 flue gases, middle part V2 flue gases, middle tail flue gas and tail flue gas, by middle part V1 flue gases and tail flue gas It is circulated again into sintering process as circulating flue gas, head flue gas, middle part V2 flue gases and middle tail flue gas is subjected to activated carbon Desulphurization denitration processing, is purified flue gas, purified flue gas is passed through chimney and is discharged.
2. according to the method described in claim 1, it is characterized in that, the head, middle part V1, middle part V2, middle tail portion, tail portion exist Length accounting in sintering machine sintering region is 2~3:4~6:6~8:4~6:2~4.
3. according to the method described in claim 1, it is characterized in that, the temperature of the head flue gas be 50~70 DEG C, vapor Content is less than 8%;The temperature of the middle part V1 flue gases is 50~70 DEG C, and water vapour content is 8~20%, NOx content for 250~ 400mg/Nm3;The temperature of the middle part V2 flue gases is 50~70 DEG C, and water vapour content is 8~20%, NOx content for 250~ 400mg/Nm3;SO in the middle tail flue gas2Content is 500~3000mg/Nm3;The temperature of the tail flue gas for 250~ 500 DEG C, O2Content is more than 19%.
4. according to the method described in claim 1, it is characterized in that, the pretreatment includes operating procedure in detail below:It will be solid Content is injected to for 50~60% milk of lime slurries in solid fuel, and it is 2 to control the mass ratio of fuel and CaO:1~3:1, it is stirring Milk of lime is made to be adhered to the surface of fuel under the action of mixing.
5. according to the method described in claim 1, it is characterized in that, the circulating flue gas, which is circulated again into sintering process, is Refer to, circulating flue gas first need to be hybridly prepared into mixed gas with air, mixed gas is then imported into following for sintering machine charge level again In ring petticoat pipe.
6. according to the method described in claim 5, it is characterized in that, O in the mixed gas2Content is more than 16%.
7. according to the method described in claim 1, it is characterized in that, the active carbon desulfurization denitration process includes the following steps: First using the particulate matter in electric precipitation removing flue gas, it is 130~150 DEG C to maintain flue-gas temperature, and flue gas then is passed through activity Desulphurization denitration processing is carried out in charcoal adsorption tower, ammonia is sprayed into flue gas, controls NH3Molar ratio with NOx is 0.5~0.7.
8. according to the method described in claim 1, it is characterized in that, carry out desulphurization denitration processing through the active carbon absorption technology Afterwards in the outer flue gas arranged, the equivalent concentration of NOx is less than 100mg/Nm3, the equivalent concentration is 16%~17% oxygen equivalent condition Under NOx concentration, centinormal 1 computational methods are:
In formula,For the equivalent concentration of NOx, unit mg/Nm3;βO2For the actual concentrations of oxygen in flue gas, unit %; For the actual concentrations of NOx in flue gas, unit mg/Nm3
A kind of 9. method for implementing to reduce sintering flue gas NOx emission such as Whole Process Control according to any one of claims 1 to 8 Device, which is characterized in that including raw materials for sintering storehouse (1), sintering machine (6) and activated carbon adsorber (13), the sintering machine (6) Interior sintering region is divided into head, middle part V1, middle part V2, middle tail portion and tail portion, sintering machine (6) according to the length direction of sintering machine Bottom correspond to securement head flue (7), middle part V1 flues (8), middle part V2 flues (9), middle back-end ductwork (10) and tail portion cigarette Road (11), the top of sintering machine (6) is sintering fabric, and the sintering fabric is ignited cover (2), insulation cover (3), cycle petticoat pipe (4) all coverings successively;The middle part V1 flues (8) and back-end ductwork (11) are connected with the first flue (5), and described first One end of flue (5) is connect with cycle petticoat pipe (4), and air inducting device (15) is connected on first flue (5); The head flue (7), middle part V2 flues (9), middle back-end ductwork (10) are connected with the second flue (14), second cigarette One end of feed channel (14) is connect with activated carbon adsorber (13), and electric precipitator is connected on second flue (14) (12)。
10. device according to claim 9, which is characterized in that the igniting cover (2), insulation cover (3), cycle petticoat pipe (4) Length accounting in sintering machine charge level is 2~3:4~6:12~18.
CN201711364224.0A 2017-12-18 2017-12-18 A kind of Whole Process Control reduces the method and its device of sintering flue gas NOx emission Pending CN108159861A (en)

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