CN104513897A - Iron ore sintering method with ultrahigh-proportion flue gas circulation - Google Patents
Iron ore sintering method with ultrahigh-proportion flue gas circulation Download PDFInfo
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- CN104513897A CN104513897A CN201410789734.2A CN201410789734A CN104513897A CN 104513897 A CN104513897 A CN 104513897A CN 201410789734 A CN201410789734 A CN 201410789734A CN 104513897 A CN104513897 A CN 104513897A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
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Abstract
The invention discloses an iron ore sintering method with ultrahigh-proportion flue gas circulation. Flue gas passing through the head of an interception part is subjected to condensation and dewatering treatment, so that the volume concentration of water vapor is smaller than or equal to 10 percent, and then the flue gas is mixed with high-O2 tail flue gas to prepare circulatory flue gas; the volume of the circulatory flue gas is controlled to account for 50-69 percent of the total column of the flue gas in a sintering machine; the temperature of the circulatory flue gas is higher than or equal to 120 DEG C, and O2 is mixed into the circulatory flue gas, so that the O2 concentration in the circulatory flue gas can meet the requirement on fuel combustion; the circulatory flue gas is introduced into a sealed flue gas hood covering the head and the middle of the sintering machine; the flue gas retained at the head and the flue gas at the middle part are discharged after being desulfured. On the premise of guaranteeing the yield of sintered ores and not affecting the quality index, the flue gas emission can be reduced by over 50 percent; meanwhile, emission of pollutants such as dust, NOx and CO in the sintered flue gas can be greatly reduced.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, be specifically related to the iron ore sintering method of a kind of superelevation ratio flue gas recirculation, to reach the object of sinter fume pollution reduction.
Background technology
China's ironmaking system is based on sintering-blast furnace process, and sintering is the important procedure of iron and steel enterprise, is also typical high energy consumption, maximum discharge, high pollution link.The exhaust gas volumn of sintering circuit discharge accounts for 40% of iron and steel enterprise's total amount, and containing CO in flue gas
x, SO
x, NO
xdeng multiple pollutant, it is the main source of atmospheric pollution of iron and steel enterprise.Therefore, reduce the discharge of sintering process greenhouse gases and dusty gas, the Sustainable development of Iron And Steel Industry is had great importance.
Sinter fume pollution reduction mainly adopts flue gases purification, removes objectionable impurities in flue gas by setting up smoke eliminator at fume emission end.But end treatment investment is large, running cost is high, brings huge cost pressure to sintering.For reducing off gas treatment cost, utilize the waste heat of sinter fume, abroad begin one's study in 20 end of the centurys method flue gas recirculation of part high temperature sintering being carried out to sinter machine forebody recycling.When flue gas recirculation is to sinter bed, the dust fractions in flue gas can be adsorbed and is stranded in sinter bed, the NO in flue gas
xat high temperature can by pyrolysis by Partial digestion ， dioxin; There is secondary combustion heat release in the compounds such as CO, CH simultaneously in flue gas, can reduce solid burnup, reduce NO further in sintering process
x, SO
2deng discharge.Therefore, flue gas recirculation has significant comprehensive emission reduction effect to pollutent.
Current, the ratio of flue gas recirculation is generally lower, and mostly about 35%, therefore most of flue gas is still discharged into air.For reducing the ratio of fume emission, need the ratio improving flue gas recirculation further, but when flue gas recirculation ratio height, O in circulating flue gas
2content is reduced to comparatively low degree, causes fuel combustion in sinter bed incomplete, affects sinter quality; And H in circulating flue gas
2o (g) content is too high, H
2o (g), in bottom bed of material condensation, causes the bed of material cross wet and affect sintering process ventilation property, causes sintering velocity slack-off; SO in circulating flue gas simultaneously
2content is too high, causes SO
2be attracted in agglomerate and enrichment occurs, add blast furnace ironmaking sulphur analysis.Therefore, flue gas recirculation reduces SINTERING PRODUCTION efficiency and agglomerate quality at high proportion.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming prior art existence, there is provided a kind of flue gas recirculation ratio high, significantly can reduce smoke discharge amount, improve flue gas pollutant emission reduction efficiency, can not have a negative impact to Sintering Yield and quality simultaneously, and the iron ore sintering method of the superelevation ratio flue gas recirculation of the sulphur content of agglomerate can not be increased.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
The iron ore sintering method of a kind of superelevation ratio flue gas recirculation, sinter fume in sinter machine is divided into head flue gas, middle part flue gas and tail flue gas successively along sinter machine length direction, head flue gas accounts for 50% ~ 55% of flue gas cumulative volume, middle part flue gas accounts for 20% ~ 30% of flue gas cumulative volume, and tail flue gas accounts for 20% ~ 25% of flue gas cumulative volume; The head flue gas of part in sinter machine is mixed as circulating flue gas with whole tail flue gas after dehydration pre-treatment and add a certain amount of O in circulating flue gas
2after deliver in the petticoat pipe of sinter machine and carry out agglomeration for iron mine, wherein, the volume of controlled circulation flue gas accounts for 50% ~ 69% of flue gas cumulative volume in sinter machine, and the temperature of controlled circulation flue gas is more than or equal to 120 DEG C.
Above-mentioned method, preferably, the described head flue gas for circulating steam-laden volumetric concentration after dehydration pre-treatment is less than or equal to 10%.
Above-mentioned method, preferably, described head flue gas adopts condensing mode to carry out dehydration pre-treatment, and the temperature of described circulating flue gas is controlled by the temperature after adjustment head flue gas condensing.
Above-mentioned method, preferably, described O
2add-on control according to formula Y>=18%+25% × (X-50%), in formula, Y represents O in circulating flue gas
2volumetric concentration, X represents recycle ratio, and described recycle ratio is the ratio of flue gas cumulative volume in the volume of circulating flue gas and sinter machine.
Above-mentioned method, preferably, described petticoat pipe arranges near sintering device handpiece and covers head and the middle part of sinter machine, and the area coverage of petticoat pipe accounts for 75% ~ 80% of sinter machine area.
Above-mentioned method, preferably, described head flue gas is derived by the Header cyclic flue under sinter machine head bellows, mix with the tail flue gas of deriving from the afterbody cycle flue under sinter machine afterbody bellows after condensing works condensation dehydration, then enter into petticoat pipe through fly-ash separator, vacuum fan successively.
Above-mentioned method, preferably, described middle part flue gas and the head flue gas do not circulated diffuse after dedusting, desulfurization.
Above-mentioned method, preferably, described middle part flue gas and the head flue gas do not circulated are that the acyclic flue of the middle part cycle flue respectively in the middle part of sinter machine under bellows and the head under sinter machine head bellows is derived, and are discharged into outside atmosphere successively again after converging through fly-ash separator, vacuum fan and desulphurization system.
Above-mentioned method, preferably, described head flue gas intercepts from the head of sinter machine, and intercepting ratio accounts for 60% ~ 80% of head flue gas volume total amount.
Above-mentioned method, preferably, joins the O in circulating flue gas
2for industrial pure oxygen, and be that the mode directly joined in petticoat pipe carries out adding.
Compared with prior art, the invention has the advantages that: the Drainage feature that the present invention is directed to pollutent in sinter fume, by appropriate design flue gas recirculation mode, develop the sintering method of a kind of superelevation ratio flue gas recirculation, under the prerequisite not affecting Sintering Yield and quality index, make flue gas recirculation ratio reach more than 50%, reach pollutent and reduce discharging object greatly.It is according to the feature of sinter machine length direction different positions smoke components, sinter fume is divided into the head flue gas of low temperature, high water vapor (accounting for flue gas cumulative volume 50% ~ 55%), high SO
2, high dust middle part flue gas (accounting for flue gas cumulative volume 20% ~ 30%), and high temperature, high O
2tail flue gas (accounting for flue gas cumulative volume 20% ~ 25%), by tail flue gas bound fraction head flue gas is circulated, make the flue gas of circulation reach the superelevation ratio of more than 50%, not only play a role in energy saving, significantly reduce dust, NO in sinter fume simultaneously
x, the pollutent such as CO discharge, fume emission more than 50% can be reduced, reduce dust discharge more than 40%, NO
xmore than 40%, more than CO50%; By adding O in circulating flue gas
2ensure O
2content, the requirement of sintering process fuel combustion can be met, ensure the consistence of sintering combustion front rate and heat front velocity, thus the seed output and quality index of agglomerate can not be affected; The SO of sinter machine head flue gas
2content is low, H
2o (g) content is high, mixes as circulating flue gas, can control H in circulating flue gas using tail flue gas with the head flue gas after dehydration
2o (g) and SO
2content remains at low levels, and can not increase the sulphur content of agglomerate; In addition, the temperature of sinter machine head flue gas is lower (50 ~ 60 DEG C), and condensation of only need slightly lowering the temperature can remove moisture content and for circulation.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the iron ore sintering method of superelevation ratio of the present invention flue gas recirculation.
Marginal data:
1, sinter machine; 2, distribution device; 3, portfire; 4, petticoat pipe; 5, Header cyclic flue; 6, the acyclic flue of head; 7, middle part flue; 8, afterbody cycle flue; 9, the first fly-ash separator; 10, the first vacuum fan; 11, desulphurization system; 12, condensing works; 13, the second fly-ash separator; 14, the second vacuum fan.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but protection scope of the present invention is not limited to following specific embodiment.
As shown in Figure 1, distribution device 2 and the portfire 3 of sinter machine 1 are arranged on head position, sinter machine 1 is divided into head L1, middle part L2 and afterbody L3 along its length successively, wherein, head L1 account for that 50% ~ 55% of sinter machine 1 length, middle part L2 accounts for sinter machine 1 length 20% ~ 30%, afterbody L3 accounts for 20% ~ 25% of sinter machine 1 length, petticoat pipe 4 arranges near sinter machine 1 head and covers head and the middle part of sinter machine 1, and the area coverage of petticoat pipe 4 accounts for 75% ~ 80% of sinter machine 1 area.The bellows connection header cycle flue 5 of head L1 leading portion, all bellows of afterbody L3 connect afterbody cycle flue 8, Header cyclic flue 5 connects condensing works 12 import by pipeline, after the pipeline of condensing works 12 outlet and the connecting tube of afterbody cycle flue 8 converge, then be connected with petticoat pipe 4 with the second vacuum fan 14 by the second fly-ash separator 13 successively.The acyclic flue 6 of bellows connection header of head L1 back segment, all bellows of middle part L2 connect middle part flue 7, after the connecting tube of the acyclic flue 6 of head and the connecting tube of middle part flue 7 converge, then be communicated with outside atmosphere by the first fly-ash separator 9, first vacuum fan 10, desulphurization system 11 successively.
Embodiment 1:
Raw materials for sintering condition: according to the mass ratio batching (obtaining agglomerate main chemical compositions is: TFe57.7%, SiO24.9%, R2.0, MgO1.8%) of mixing iron ore 61.22%, rhombspar 5.01%, Wingdale 2.33%, unslaked lime 4.51%, sinter return fine 23.08%, coke powder 3.85%.By distribution device 2 above-mentioned raw materials for sintering is distributed in sinter machine 1 and sinters.
The head flue gas of sinter machine 1 accounts for 50% of sinter fume cumulative volume, and middle part flue gas accounts for 30% of sinter fume cumulative volume, and tail flue gas accounts for 20% of sinter fume cumulative volume, and the area that petticoat pipe 4 covers sinter machine 1 is 80%.The head flue gas of 60% is intercepted for circulation by Header cyclic flue 5, head flue gas is after 10% through condensing works 12 condensation dehydration to the volumetric concentration of water vapour, converge with tail flue gas and form circulating flue gas (total flue gas recirculation ratio is 50%), circulating flue gas is passed into petticoat pipe 4 for sintering through the second fly-ash separator 13 and the second vacuum fan 14 successively, adds industrial pure oxygen to control the O of the circulating flue gas entering into petticoat pipe 4 in petticoat pipe 4 simultaneously
2concentration is 18%, and carrying out controlled circulation flue-gas temperature by regulating the temperature of condensation poll flue gas is 130 DEG C.Compared with ordinary sinter, adopt above-mentioned superelevation ratio flue gas recirculation sintering technology, decrease fume emission 50%, decrease the dust of 42%, the NO of 40%
xwith the CO discharge of 45%, the seed output and quality index of agglomerate is substantially unaffected simultaneously.
Embodiment 2:
Raw materials for sintering condition: according to the mass ratio batching (obtaining agglomerate main chemical compositions is: TFe58.33%, SiO25.0%, R1.9, MgO2.3%) of mixing iron ore 61.41%, rhombspar 5.61%, Wingdale 2.05%, unslaked lime 3.85%, sinter return fine 23.08%, coke powder 4.00%.By distribution device 2 above-mentioned raw materials for sintering is distributed in sinter machine 1 and sinters.
The head flue gas of sinter machine 1 accounts for 55% of sinter fume cumulative volume, and middle part flue gas accounts for 20% of sinter fume cumulative volume, and tail flue gas accounts for 25% of sinter fume cumulative volume, and the area that petticoat pipe 4 covers sinter machine 1 is 75%.The head flue gas of 80% is intercepted for circulation by Header cyclic flue 5, head flue gas is after 8% through condensing works 12 condensation dehydration to the volumetric concentration of water vapour, converge with tail flue gas and form circulating flue gas (total flue gas recirculation ratio is 69%), circulating flue gas is passed into petticoat pipe 4 for sintering through the second fly-ash separator 13 and the second vacuum fan 14 successively, adds industrial pure oxygen to control the O of the circulating flue gas entering into petticoat pipe 4 in petticoat pipe 4 simultaneously
2concentration is 22.75%, and carrying out controlled circulation flue-gas temperature by regulating the temperature of condensation poll flue gas is 120 DEG C.Compared with ordinary sinter, adopt above-mentioned superelevation ratio flue gas recirculation sintering technology, decrease fume emission 69%, decrease the dust of 58%, the NO of 53%
xwith the discharge of the CO of 60%, the seed output and quality index of agglomerate is substantially unaffected simultaneously.
Claims (10)
1. the iron ore sintering method of superelevation ratio flue gas recirculation, it is characterized in that: the sinter fume in sinter machine is divided into head flue gas, middle part flue gas and tail flue gas successively along sinter machine length direction, head flue gas accounts for 50% ~ 55% of flue gas cumulative volume, middle part flue gas accounts for 20% ~ 30% of flue gas cumulative volume, and tail flue gas accounts for 20% ~ 25% of flue gas cumulative volume; The head flue gas of part in sinter machine is mixed as circulating flue gas with whole tail flue gas after dehydration pre-treatment and add a certain amount of O in circulating flue gas
2after deliver in the petticoat pipe of sinter machine and carry out agglomeration for iron mine, wherein, the volume of controlled circulation flue gas accounts for 50% ~ 69% of flue gas cumulative volume in sinter machine, and the temperature of controlled circulation flue gas is more than or equal to 120 DEG C.
2. the iron ore sintering method of superelevation ratio according to claim 1 flue gas recirculation, is characterized in that: the described head flue gas for circulating steam-laden volumetric concentration after dehydration pre-treatment is less than or equal to 10%.
3. the iron ore sintering method of superelevation ratio according to claim 2 flue gas recirculation, is characterized in that: described head flue gas adopts condensing mode to carry out dehydration pre-treatment, and the temperature of described circulating flue gas is controlled by the temperature after adjustment head flue gas condensing.
4. the iron ore sintering method of superelevation ratio according to claim 1 flue gas recirculation, is characterized in that: described O
2add-on control according to formula Y>=18%+25% × (X-50%), in formula, Y represents O in circulating flue gas
2volumetric concentration, X represents recycle ratio, and described recycle ratio is the ratio of flue gas cumulative volume in the volume of circulating flue gas and sinter machine.
5. the iron ore sintering method of superelevation ratio according to claim 1 flue gas recirculation, is characterized in that: described petticoat pipe arranges near sintering device handpiece and covers head and the middle part of sinter machine, and the area coverage of petticoat pipe accounts for 75% ~ 80% of sinter machine area.
6. the iron ore sintering method of superelevation ratio according to claim 1 flue gas recirculation, it is characterized in that: described head flue gas is derived by the Header cyclic flue under sinter machine head bellows, mix with the tail flue gas of deriving from the afterbody cycle flue under sinter machine afterbody bellows after condensing works condensation dehydration, then enter into petticoat pipe through fly-ash separator, vacuum fan successively.
7. the iron ore sintering method of superelevation ratio according to claim 1 flue gas recirculation, is characterized in that: described middle part flue gas and the head flue gas do not circulated diffuse after dedusting, desulfurization.
8. the iron ore sintering method of superelevation ratio according to claim 6 flue gas recirculation, it is characterized in that: described middle part flue gas and the head flue gas do not circulated are that the acyclic flue of the middle part cycle flue respectively in the middle part of sinter machine under bellows and the head under sinter machine head bellows is derived, and are discharged into outside atmosphere successively again after converging through fly-ash separator, vacuum fan and desulphurization system.
9. the iron ore sintering method of superelevation ratio according to claim 1 flue gas recirculation, is characterized in that: described head flue gas intercepts from the head of sinter machine, and intercepting ratio accounts for 60% ~ 80% of head flue gas volume total amount.
10. the iron ore sintering method of superelevation ratio according to claim 1 flue gas recirculation, is characterized in that: join the O in circulating flue gas
2for industrial pure oxygen, and be that the mode directly joined in petticoat pipe carries out adding.
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Cited By (4)
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| CN112161484A (en) * | 2020-09-23 | 2021-01-01 | 昆明理工大学 | Recycling method of iron ore sintering gas |
| CN114849431A (en) * | 2022-04-29 | 2022-08-05 | 秦皇岛新特科技有限公司 | Air box assembly, clinker production device and flue gas pollutant treatment equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105063345A (en) * | 2015-08-27 | 2015-11-18 | 中南大学 | Control method of H2O (g) in sintering gas on high-proportion flue gas circulation condition |
| CN110953894A (en) * | 2019-12-16 | 2020-04-03 | 北京中航泰达环保科技股份有限公司 | Sintering machine flue gas circulation purification and waste heat utilization system and method |
| CN112161484A (en) * | 2020-09-23 | 2021-01-01 | 昆明理工大学 | Recycling method of iron ore sintering gas |
| CN114849431A (en) * | 2022-04-29 | 2022-08-05 | 秦皇岛新特科技有限公司 | Air box assembly, clinker production device and flue gas pollutant treatment equipment |
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