CN105543471B - A kind of NOx control methods based on suppression Ore Sintering Process fuel bound nitrogen conversion - Google Patents
A kind of NOx control methods based on suppression Ore Sintering Process fuel bound nitrogen conversion Download PDFInfo
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- CN105543471B CN105543471B CN201610071111.0A CN201610071111A CN105543471B CN 105543471 B CN105543471 B CN 105543471B CN 201610071111 A CN201610071111 A CN 201610071111A CN 105543471 B CN105543471 B CN 105543471B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
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Abstract
The invention discloses a kind of based on the NOx control methods for suppressing the conversion of Ore Sintering Process fuel bound nitrogen, first the particle screening for being less than 1mm in sinter return fine is come out, then by 1mm sinter return fine, Fine Hematite Ore, quick lime, sintering fuel and with cementation hydrocarbon dispensing after, prefabricated grain is carried out in trommel mixer, gained compound is pelletized with remaining iron-bearing material, flux, sinter return fine；Then by its cloth, igniting, sintering.The present invention for the conversion of volatile matter nitrogen and coke nitrogen to NOx has separately designed discharge-reducing method, by suppressing fuel N oxidation reaction and promoting NOx reduction reaction two methodses, realizes the discharge of the control NOx in sintering process, with strong points, emission reduction effect is good.
Description
Technical field
The invention belongs to field of steel metallurgy, more particularly to it is a kind of based on suppressing the conversion of Ore Sintering Process fuel bound nitrogen
NOx control methods.
Background technology
NOx (nitrogen oxides) is one of main reason of photochemical fog and acid rain, and pollution problem caused by it is discharged is tight
Ghost image rings ecological environment and is detrimental to health.The most important NOx emission of industry comes from fossil fuel (coal, oil, day at present
Right gas etc.) burning, iron and steel enterprise is one of important sources of NOx emission, accounts for more than the 10% of national NOx discharge.And
In sintering circuit, substantial amounts of coke powder, anthracite etc. are consumed, its NOx discharge accounts for the 48% of iron and steel enterprise's total release.2015
On January 1, in comes into effect《Steel sintering, pelletizing industrial air pollution thing discharge standard》Middle regulation NOx emission new standard is
300mg/m3, and NOx concentration is typically in 400~600mg/m in current domestic iron and steel enterprises sintering flue gas3, realize in sintering process
NOx emission reduction is extremely urgent.
NOx is mainly fuel type NOx in sintering process, is typically derived from the burning of coke powder or anthracite etc..Common
Under ignition temperature, NO accounts for 90% or so, NO in NOx caused by solid fuel ignition2Account for 5%~10%, N2O accounts for 1% or so.Together
When, if there is reducing atmosphere and appropriate catalyst action, NOx is also possible to be reduced into N2Or the NOx of low price.Fuel type
NOx formation mechanism is more complicated, with the close phase such as distribution, ignition temperature and oxygen concentration of the nitrogen in volatile matter and coke
Close.Abundant experimental results show, heat initial stage, and volatile matter nitrogen discharges that nitrogen-containing group ratio is higher, with temperature rise and
The extension in reaction time, the nitrogen-containing group in coke nitrogen start a large amount of to participate in reaction.
At present, substantial amounts of research has been expanded for NOx abatement and removal methods domestic and foreign scholars, mainly had following
The technology of three types：1. low NOx combusting technology, by using oxygen concentration, reduction ignition temperature, reduction around reduction fuel
Fuel is in the high-temperature region residence time, the means such as addition reducing agent promote NOx to decompose or be reduced to N in stove2；2. selectivity is urged
Change reduction gas denitrifying technology, under conditions of certain temperature and with catalyst, utilize CH4、CO、H2、NH3Etc. reproducibility thing
NOx is reduced into N by matter2；3. SNCR gas denitrifying technology, it is to spray ammonia or urea etc. into flue gas to contain amino
Reducing agent, in the case of high temperature (850~1100 DEG C) and without catalyst, pass through caused ammonia free radical in flue gas stream
Reacted with NOx, NOx is reduced into N2And H2O.NOx emission reduction technically can be achieved above, but it is multiple cost height, technique to be present
The problems such as miscellaneous, and it is primarily adapted for use in coal-burning power plant.Because steel sintering smoke yields are big, flue-gas temperature is low, urged using selectivity
Changing the technique of the end treatments such as denitration needs supporting fume treatment auxiliary to put into big, cost height.And for low NOx combustion skill
Art, because sintering process is related to the course of reaction of Various Complex, change burning condition may produce considerable influence to sintering process,
Still hardly possible is applied to sintering process for it.Foreign countries have scholar to utilize microwave heating treatment upper strata sintering feed before sintering ignition, it is believed that can
To reduce NOx discharge to a certain extent, but O2Concentration need to be controlled below 18%.Domestic Wang Zhi et al. is fired using decoupling
Burn and return to denitrating technique altogether with flue gas, added into the flue gas for be recycled back to pallet and contain H2, CO and NH3, HCN pyrolysis gas
With the NOx of reduction generation so that NOx obtains a certain degree of degraded；Wuhan University Of Technology's Bi Xue works et al. are to sinter mixture
Generation NH can be decomposed under middle addition hot conditions3Ammonia additive, under the catalytic action of iron ore, NH3Burning can be reduced
The NOx generated during knot.Studies have shown that above technology can not only influence Sintering Operation Index index, and emission reduction efficiency is simultaneously
Undesirable, the use of a large amount of additives also increases cost.Therefore, a kind of easy and effective, inexpensive sintering NOx abatement is developed
Technology, pollutant emission is reduced to steel sintering factory, the environmentally friendly cost of reduction has great importance.
The content of the invention
The technical problem to be solved in the present invention is overcome the deficiencies in the prior art, there is provided one kind is fired based on sintering process is suppressed
Expect nitrogen conversion NOx control methods, the technical process is simple, low for equipment requirements, cost is cheap, do not increase sintering production into
This, do not reduce the emission reduction that NOx can be effectively realized on the basis of Sintering Operation Index.
In order to solve the above technical problems, technical scheme proposed by the present invention is：
A kind of NOx control methods based on suppression Ore Sintering Process fuel bound nitrogen conversion, first will be less than 1mm in sinter return fine
Particle screening come out, then by -1mm sinter return fine, Fine Hematite Ore, quick lime, sintering fuel and there is cementation
Hydrocarbon dispensing after, carry out prefabricated grain in trommel mixer, gained compound and remaining iron-bearing material, flux, burning
Knot, which is returned mine, carries out conventional granulation；Then by its cloth, igniting, sintering；Wherein described sintering fuel is coke powder or anthracite.
Above-mentioned method, it is preferred that during the prefabricated grain, the dosage of -1mm sinter return fines is sintering fuel quality
1.5~3.0 times.
Above-mentioned method, it is preferred that SiO in the Fine Hematite Ore2Mass content be 4~6%；The red iron of particulate
Ore deposit is more than 70% hematite concentrates for -0.074mm mass contents, or -0.5mm mass contents are more than 50% hematite ore fines, or
Both mixtures.
Above-mentioned method, it is preferred that the addition of the Fine Hematite Ore is the 20~40% of sintering iron ore gross mass.
Above-mentioned method, it is preferred that the hydrocarbon is in sucrose, starch, carboxymethyl cellulose, pendant benefit
One or several kinds, its addition be sintering fuel, -1mm sinter return fine, Fine Hematite Ore quality sum 0.1%~
0.3%.
Above-mentioned method, it is preferred that Fine Hematite Ore and the compound basicity of quick lime composition are adjusted by quick lime
(CaO and SiO2Mass ratio) be 2.0~2.4.
The present invention passes through sintering fuel and Fine Hematite Ore, particulate sinter return fine, quick lime and with cementation
Bead is made in hydrocarbon, its object is to：1. volatile matter nitrogen just starts to discharge initial stage in burning, now sintering fuel periphery
Hydrocarbon the groups such as CH, CO, H, OH can be decomposited when ignition temperature is relatively low, these groups not only can be with volatile matter
In nitrogen-containing compound response inhabitation NOx generations, additionally it is possible to the NOx that has generated of reduction；2. with the raising of ignition temperature, coke
Nitrogen takes place oxidation reaction, and the now sinter return fine of -1mm in bead, due to itself containing the catalysis NOx drops such as calcium ferrite
The material of solution, and specific surface area is larger, NOx can be promoted to be reduced to N2, simultaneously as fine-graded sinter return fine is in lower temperature
Under can form liquid phase, can promote the reaction between Fine Hematite Ore and quick lime, and due to the control of material basicity 2.0~
Between 2.4, be advantageous to fuel periphery and form more calcium ferrite systems material, so as to further promote NOx deoxidization, degradation.
Compared with prior art, the advantage of the invention is that：
(1) present invention has separately designed discharge-reducing method for the conversion of volatile matter nitrogen and coke nitrogen to NOx, by suppressing to fire
Expect N oxidation reaction and promote NOx reduction reaction two methodses, realize the discharge that NOx is controlled in sintering process, for
Property is strong, emission reduction effect is good.
(2) present invention by sintering fuel and Fine Hematite Ore, particulate sinter return fine, quick lime and has cementation
Hydrocarbon bead is made, given full play to the effect of hydrocarbon, its adhesive property is advantageous to pelletize, while is firing
The volatile generation of hydrocarbon is beneficial to suppress the groups such as CH, CO, H, OH of NO generations under the conditions of burning, and self-produced using sintering
Sinter return fine contains the characteristic of catalyst calcium ferrite, and effectively facilitates sintering process fast-growing fast at low temperature by reasonable dispensing
Into calcium ferrite, combustion process NOx deoxidization, degradation is effectively increased, realizes and NOx emission is controlled in sintering process, without follow-up
Fume treatment, and do not change conventional sintering process system, do not increase production cost, Sintering Operation Index will not be reduced.
Embodiment
For the ease of understanding the present invention, present invention work more comprehensively, is meticulously described below in conjunction with preferred embodiment,
But protection scope of the present invention is not limited to embodiment in detail below.
Unless otherwise defined, the implication that all technical terms used hereinafter are generally understood that with those skilled in the art
It is identical.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to the limitation present invention
Protection domain.
Except there is a special instruction, the various reagents used in the present invention, raw material be can be commercially commodity or
Person can pass through product made from known method.
Embodiment 1：
It is a kind of of the invention based on the NOx control methods for suppressing the conversion of Ore Sintering Process fuel bound nitrogen, comprise the following steps：
(1) -1mm sinter return fines are sifted out first；
(2) coke powder is weighed, -1mm sinter return fines (the quality of -1mm sinter return fines that step (1) is sifted out is added in coke powder
For 1.5 times of coke powder quality)；According still further to sintered iron ore gross mass 20% addition hematite concentrates (in hematite concentrates-
0.074mm concentrate mass content accounts for 75%, SiO in hematite concentrates2Content is 4%) to mix；It is red to add quick lime regulation particulate
Iron ore is 2.4 with the compound basicity that quick lime is formed；Finally adding sucrose, (addition of sucrose is coke powder, -1mm sintering returns
Ore deposit and hematite concentrates quality sum 0.3%), prefabricated grain is carried out after above proportioning materials in trommel mixer, is obtained prefabricated
Grain compound；
(3) it is the compound that step (2) obtains and the conventional granulation of remaining iron-bearing material, sinter return fine and flux progress is laggard
Row cloth, igniting, sintering.
Test sintering index and NOx abatement amount are as shown in table 1, Sintering Operation Index and benchmark the sintering index phase of this technique
Closely, and NOx discharge is from 349mg/Nm3It is reduced to 302mg/Nm3。
Embodiment 2：
It is a kind of of the invention based on the NOx control methods for suppressing the conversion of Ore Sintering Process fuel bound nitrogen, comprise the following steps：
(1) -1mm sinter return fines are sifted out first；
(2) coke powder is weighed, -1mm sinter return fines (the quality of -1mm sinter return fines that step (1) is sifted out is added in coke powder
For 3.0 times of coke powder quality)；According still further to 40% addition hematite ore fines (- 0.5mm in hematite ore fines of sintered iron ore gross mass
Fine ore mass content account for 60%, SiO in hematite ore fines2Content is 6.0%) to mix；Add quick lime regulation Fine Hematite Ore
It is 2.0 with the compound basicity that quick lime is formed；Finally add starch (addition of starch be coke powder, -1mm sinter return fines and
Hematite ore fines quality sum 0.2%), prefabricated grain is carried out after above proportioning materials in trommel mixer, prefabricated grain is obtained and mixes
Close material；
(3) it is the compound that step (2) obtains and the conventional granulation of remaining iron-bearing material, sinter return fine and flux progress is laggard
Row cloth, igniting, sintering.
Test sintering index and NOx abatement amount are as shown in table 1, Sintering Operation Index and benchmark the sintering index phase of this technique
Closely, and NOx discharge is from 349mg/Nm3It is reduced to 281mg/Nm3。
Embodiment 3：
It is a kind of of the invention based on the NOx control methods for suppressing the conversion of sintering process fuel bound nitrogen, comprise the following steps：
(1) -1mm sinter return fines are sifted out first；
(2) coke powder is weighed, -1mm sinter return fines (the quality of -1mm sinter return fines that step (1) is sifted out is added in coke powder
For 2.5 times of coke powder quality)；According still further to 30% addition hematite ore fines (- 0.5mm in hematite ore fines of sintered iron ore gross mass
Fine ore mass content account for 55%, SiO in hematite ore fines2Content is 5.0%) to mix；Add quick lime regulation Fine Hematite Ore
It is 2.2 with the compound basicity that quick lime is formed；Finally adding pendant benefit, (addition of pendant benefit is coke powder, -1mm sintering returns
Ore deposit and hematite ore fines quality sum 0.1%), prefabricated grain is carried out after above proportioning materials in trommel mixer, is obtained prefabricated
Grain compound；
(3) it is the compound that step (2) obtains and the conventional granulation of remaining iron-bearing material, sinter return fine and flux progress is laggard
Row cloth, igniting, sintering.
Test sintering index and NOx abatement amount are as shown in table 1, Sintering Operation Index and benchmark the sintering index phase of this technique
Closely, and NOx discharge is from 349mg/Nm3It is reduced to 292mg/Nm3。
Embodiment 4：
It is a kind of of the invention based on the NOx control methods for suppressing the conversion of sintering process fuel bound nitrogen, comprise the following steps：
(1) -1mm sinter return fines are sifted out first；
(2) coke powder is weighed, -1mm sinter return fines (the quality of -1mm sinter return fines that step (1) is sifted out is added in coke powder
For 2.2 times of coke powder quality)；According still further to sintered iron ore gross mass 25% addition hematite concentrates (in hematite concentrates-
0.074mm concentrate mass content accounts for 90%, SiO in hematite concentrates2Content is 5.2%) to mix；Add quick lime regulation particulate
Bloodstone is 2.1 with the compound basicity that quick lime is formed；Finally adding CMC, (CMC addition is coke powder, -1mm sintering returns
Ore deposit and hematite concentrates quality sum 0.2%), prefabricated grain is carried out after above proportioning materials in trommel mixer, is obtained prefabricated
Grain compound；
(3) it is the compound that step (2) obtains and the conventional granulation of remaining iron-bearing material, sinter return fine and flux progress is laggard
Row cloth, igniting, sintering.
Test sintering index and NOx abatement amount are as shown in table 1, Sintering Operation Index and benchmark the sintering index phase of this technique
Closely, and NOx discharge is from 349mg/Nm3It is reduced to 299mg/Nm3。
1 different embodiments of table sinter index and NOx abatement amount
It is of the invention based on the NOx control methods for suppressing the conversion of sintering process fuel bound nitrogen it was found from above-mentioned analysis, do not changing
Become conventional sintering process system, do not increase production cost, on the premise of not reducing Sintering Operation Index, realize NOx emission reduction,
Pollutant emission is reduced to steel sintering factory, the environmentally friendly cost of reduction has great importance.
Claims (3)
- It is 1. a kind of based on the NOx control methods for suppressing the conversion of Ore Sintering Process fuel bound nitrogen, it is characterised in that first by sinter return fine In come out less than 1mm particle screening, then by -1mm sinter return fine, Fine Hematite Ore, quick lime, sintering fuel and have After the hydrocarbon dispensing of cementation, prefabricated grain is carried out in trommel mixer, gained compound and remaining iron-bearing material, Flux, sinter return fine are pelletized；Then by its cloth, igniting, sintering；Wherein described sintering fuel is coke powder or smokeless Coal；During the prefabricated grain, the dosage of -1mm sinter return fines is 1.5~3.0 times of sintering fuel quality；SiO in the Fine Hematite Ore2Mass content be 4~6%；The Fine Hematite Ore is that -0.074mm mass contents are big In 70% hematite concentrates, or -0.5mm mass contents are more than 50% hematite ore fines, or both mixture；The addition of the Fine Hematite Ore is the 20%~40% of sintering iron ore gross mass；The addition of the hydrocarbon For sintering fuel, -1mm sinter return fine, Fine Hematite Ore quality sum 0.1%~0.3%.
- 2. the method as described in claim 1, it is characterised in that the hydrocarbon is selected from sucrose, starch, carboxymethyl cellulose One or several kinds in element, pendant benefit.
- 3. the method as described in claim 1, it is characterised in that adjust what Fine Hematite Ore was formed with quick lime by quick lime Compound basicity is 2.0~2.4.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106521143A (en) * | 2016-11-08 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing NOx emission in sintering process |
| CN108267023B (en) * | 2016-12-30 | 2020-03-17 | 中冶长天国际工程有限责任公司 | Nitrogen oxide emission control method and device |
| CN108823401A (en) * | 2018-05-28 | 2018-11-16 | 安徽工业大学 | A kind of method that Ore Sintering Process shunts granulation emission reduction NOX |
| CN108823402A (en) * | 2018-05-28 | 2018-11-16 | 安徽工业大学 | One kind is for emission reduction NO in sintering processXMethod for mixing |
| CN109248673B (en) * | 2018-09-21 | 2020-05-22 | 中南大学 | Method for realizing emission reduction of iron ore sintering NOx and dioxin by resource utilization of waste activated carbon |
| CN109251779B (en) * | 2018-09-30 | 2021-09-17 | 柳州钢铁股份有限公司 | NOx emission reduction method based on modified fuel iron ore sintering process |
| CN109365490B (en) * | 2018-12-07 | 2020-08-25 | 中南大学 | Method for preparing sintering NOx inhibitor by utilizing metallurgy and municipal solid wastes |
| CN110607436B (en) * | 2019-09-18 | 2021-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving sinter yield |
| CN112226613B (en) * | 2020-09-17 | 2022-04-26 | 马鞍山钢铁股份有限公司 | Multi-pollutant collaborative emission reduction method in sintering process |
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