CN104131120A - Blast furnace burden distribution method for improving agglomerate utilization efficiency - Google Patents
Blast furnace burden distribution method for improving agglomerate utilization efficiency Download PDFInfo
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- CN104131120A CN104131120A CN201410349870.XA CN201410349870A CN104131120A CN 104131120 A CN104131120 A CN 104131120A CN 201410349870 A CN201410349870 A CN 201410349870A CN 104131120 A CN104131120 A CN 104131120A
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Abstract
The invention discloses a blast furnace burden distribution method for improving the agglomerate utilization efficiency. The method comprises the following steps: 1, weighing and screening agglomerates, returning agglomerates with the particle size of below 3mm as secondary return mines, and sending agglomerates with the particle size of 3mm or more to a blast furnace; and 2, controlling the burden distribution width of the agglomerates in the furnace to meet a condition that the tilting angle position difference in a burden distribution chute is 7-9DEG, and controlling the burden distribution to meet a condition that a distance from the radial edge of the agglomerates in the furnace to the wall of the furnace is 1/15-1/10 of the internal diameter of a hearth. The method breaks through restriction that the particle size of agglomerates in the furnace is not less than 4mm traditionally, allows the agglomerates with the particle size of 3-4mm to enter the furnace, and improves the small-particle-size utilization rate in order to improve the whole utilization efficiency of the agglomerates, reduce the mine return amount and alleviate the sintering pressure brought by production power; the conversion of an original coke-large particle size agglomerates-small particle size agglomerates three-step grading burden distribution mode to a coke-sintering two-step circulation burden distribution mode simplifies the burden distribution flow and improves the smelting efficiency.
Description
Technical field
The present invention relates to metallurgical technology, refer to particularly a kind of blast furnace material distribution method that improves agglomerate utilising efficiency.
Background technology
The general cloth pattern that Blast Furnace is taked is that volume particle size agglomerate and small sinter classification enter stove, and blast furnace material distribution chute is radially divided into position, 11 angles, and the burden distribution system of taking is generally
wherein, C represents coke, O
lwhat represent is volume particle size agglomerate, and O
swhat represent is small sinter, and 9 rings are generally 12 ° to the angular displacement of 5 rings, and 1 bugle position is generally 10 °.Sintering plant supplied materials carries out classification by sizing screen according to particle diameter D, little burning O
sparticle diameter 4mm≤D≤13mm, burn greatly O
lparticle diameter D>=13mm, little burning is distributed in the radial outer periphery of large burning, and the usage quantity of little burning is generally 22% of total sintered material, returns mine and sends back to sintering plant sintering again as secondary for the sintered material of particle diameter D≤4mm.
Wuhan Iron and Steel Plant iron work has increased blast furnace for 2011 No. 2, the increase of blast furnace quantity adds the progress of blast furnace operating level, make pig iron production capacity be increased to 1,730 ten thousand tons from 1,580 ten thousand tons in 2010, along with the raising of pig iron production capacity, existing caking power is difficult to keep line balancing, and the problem of caking power deficiency is day by day obvious, will certainly strengthen equipment investment and increase sinter machine, therefore, how not increase on the basis of equipment investment, alleviating sintering pressure can be just assistant officer's problem to be solved.
The Chinese invention patent that is 201110316389.7 as application number discloses a kind of sinter grading charging method, the method has been carried out classification to agglomerate by particle diameter, provided divide size and different-grain diameter agglomerate usage ratio and the distributing mode of particle diameter, the method can play effective ventilation property of improving blast furnace stock column, regulate the reasonable layout of Gas Flow, indirectly improve the utilising efficiency of agglomerate, alleviate sintering pressure, but the method has increased workload aspect sinter size grading, and high for current ore cost, the situation of raw material anxiety adopts sinter grading charging can cause the agglomerate of small particle size to can not get better utilised, improve sintering cost.
Summary of the invention
Object of the present invention is exactly that a kind of blast furnace material distribution method that improves agglomerate utilising efficiency will be provided, and the method has significantly promoted the utilising efficiency of small sinter, has alleviated production capacity and has improved the sintering pressure bringing.
For achieving the above object, the technical solution used in the present invention is: a kind of blast furnace material distribution method that improves agglomerate utilising efficiency, comprises the following steps:
1) agglomerate weighed and sieve, the agglomerate of particle diameter <3mm is returned mine and is returned to sintering again as secondary, and the agglomerate of particle diameter >=3mm is sent in blast furnace;
2) by described enter stove sintered material to be controlled at the distributor chute angular displacement that fascinates be the cloth width of 7 °～9 °, and described in controlling, to enter stove sintered material radial edges be that 1/15～1/10 of burner hearth internal diameter carries out cloth to the distance of furnace wall.
Further, described step 2) in, coke load is 4.9～5.2t/t; Described blast furnace air inlet area is 0.21～0.23m
3.
Further, described step 2) in, by described enter stove sintered material to be controlled at the distributor chute angular displacement that fascinates be the cloth width of 7 °～8 °, and described in controlling, to enter stove sintered material radial edges be 1/12～1/10 of burner hearth internal diameter to the distance of furnace wall.
Further, described step 1) in, the agglomerate that is 3～20mm by particle diameter is sent in blast furnace.
It is as follows that the present invention improves the analysis of causes of small particle size agglomerate rate of utilization: traditional view thinks that sinter grading charging is conducive to bulk cargo bed particle voids and increases, thereby can improve the ventilation property of blast furnace stock column, improve gas utilization rate, but this viewpoint is to consider from the size angle of agglomerate, do not take the impact that different grain size Metallurgical Properties of Sinter difference is brought into account, by the reduction and pulverization ratio to the interval agglomerate of different-grain diameter, reduction degree, soft heat performance, chemical composition and microtexture etc. compare known, the Metallurgical Properties of Sinter of the following grade of 10mm and microtexture are better than the agglomerate of the above grade of 10mm, wherein, particle diameter is metallurgical performance the best of 3～10mm agglomerate, the value of its DI+3.15 is higher than 90%, RI value is up to more than 85%, particle diameter is that the RI value of 3～5mm agglomerate is up to 90%, and between the softened zone of each particle diameter agglomerate, there is the trend of successively decreasing along with the increase of granularity, but gap is very small, the soft heat characteristic of each granularity is very approaching, small sinter can't cause disadvantageous effect in middle high-temperature zone, as can be seen here, the agglomerate of large particle diameter is easy to efflorescence, be difficult to reduction, there is not advantage at soft heat aspect of performance, small particle size agglomerate has more stable performance on the contrary, considering on the basis of gas utilization rate and agglomerate utilization ratio, the present invention also includes particle diameter in agglomerate raw material at the small particle size agglomerate of 3～4mm.
Compared with prior art, the present invention has the following advantages:
One, the present invention breaks through tradition and enters the restriction of stove agglomerate particle diameter need >=4mm, particle diameter is included in stove agglomerate at the sintering supplied materials of 3～4mm, the rate of utilization of small particle size agglomerate is improved, by efficiently utilizing small particle size agglomerate to improve the overall utilising efficiency of agglomerate, reduce quantity of return mines, alleviated production capacity and improved the sintering pressure bringing.
Its two, the present invention, by cloth narrowed width, makes edge air-flow developed, has effectively prevented furnace wall dross phenomenon.
Its three, the quantity of return mines that the present invention reduces is not only conducive to Sinter moulding, promotes the intensity of SINTERING PRODUCTION ability and agglomerate, and can reduce sintering fuel consumption, thereby reduced sintering cost; The incoming air area of the more existing sinter grading charging distributing process of the present invention has dwindled 2%, and coke load has improved 10%, and the raising of coke load has further reduced production cost.
They are four years old, the present invention changes by original " coke-large particle diameter agglomerate-small particle size agglomerate " three step classification distributing modes the distributing mode that " coke-sintering " two steps one circulate into, simplify cloth flow process, saved and got the raw materials ready and the material loading time, and then improved blast-furnace smelting efficiency.
Brief description of the drawings
Fig. 1 is the distributing position schematic diagram of Sinter In The Blast Furnace.
Embodiment
Below in conjunction with accompanying drawing, the invention will be described in further detail, be convenient to more clearly understand the present invention, but they do not form restriction to the present invention.
A blast furnace material distribution method that improves agglomerate utilising efficiency, comprises the following steps:
1) directly sintering plant supplied materials is transported in the groove of ore deposit, under the groove of ore deposit, weigh, sieve by vibrating screen under groove, the screen mesh size of vibrating screen under groove is 3mm, after screening, return mine the agglomerate of particle diameter <3mm as secondary and turn back to sintering plant sintering again, and the agglomerate of particle diameter >=3mm, preferably the agglomerate of 3～20mm is sent in blast furnace, and under groove, burden distribution matrix is the batch of material pattern of " coke-sintering " in two steps;
2) as shown in Figure 1, when entering stove sintered material and sending into blast furnace, being controlled at the distributor chute angular displacement that fascinates is the cloth width of 7 °～9 °, preferably the distributor chute angular displacement that fascinates is the cloth width of 8 °, the cloth width narrowing is conducive to develop edge air-flow, thereby reach two strands of air balances of center edge, and described in controlling to enter stove sintered material radial edges 2 be 1/15～1/10 of burner hearth internal diameter to the distance of furnace wall 1, be preferably 1/12～1/10 of burner hearth internal diameter, in actual production operation, incoming air area can be dwindled to 2%, preferably blast furnace air inlet area is 0.21～0.23m
3, to strengthen the blow through power of central gas stream to mineral aggregate layer, therefore can suitably improve 10% coke load, coke load is 4.9～5.2t/t preferably, and this coke load can not cause large impact to Gas Flow.
The inventive method breaks through the restriction of traditional stove agglomerate particle diameter need >=4mm of entering, particle diameter is also included in stove agglomerate at the sintering supplied materials of 3～4mm, the rate of utilization of small particle size agglomerate is improved, by efficiently utilizing small particle size agglomerate to improve the overall utilising efficiency of agglomerate, reduce quantity of return mines, alleviated production capacity and improved the sintering pressure bringing; And this distributing process makes conditions of blast furnace more stable.
Claims (4)
1. a blast furnace material distribution method that improves agglomerate utilising efficiency, comprises the following steps:
1) agglomerate weighed and sieve, the agglomerate of particle diameter <3mm is returned mine and is returned to sintering again as secondary, and the agglomerate of particle diameter >=3mm is sent in blast furnace;
2) by described enter stove sintered material to be controlled at the distributor chute angular displacement that fascinates be the cloth width of 7 °～9 °, and described in controlling, to enter stove sintered material radial edges be that 1/15～1/10 of burner hearth internal diameter carries out cloth to the distance of furnace wall.
2. the blast furnace material distribution method of raising agglomerate utilising efficiency according to claim 1, is characterized in that: described step 2) in, coke load is 4.9～5.2t/t; Described blast furnace air inlet area is 0.21～0.23m
3.
3. the blast furnace material distribution method of raising agglomerate utilising efficiency according to claim 1 and 2, it is characterized in that: described step 2) in, by described enter stove sintered material to be controlled at the distributor chute angular displacement that fascinates be the cloth width of 7 °～8 °, and described in controlling, to enter stove sintered material radial edges be 1/12～1/10 of burner hearth internal diameter to the distance of furnace wall.
4. the blast furnace material distribution method of raising agglomerate utilising efficiency according to claim 1 and 2, is characterized in that: described step 1) in, the agglomerate that is 3～20mm by particle diameter is sent in blast furnace.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104313215A (en) * | 2014-11-19 | 2015-01-28 | 中冶南方工程技术有限公司 | Blast furnace sinter graded feeding technology |
| CN104946829A (en) * | 2015-07-07 | 2015-09-30 | 山西太钢不锈钢股份有限公司 | Material distribution method for improving sintered ore utilization rate of 1800 m3 blast furnace |
| CN106399606A (en) * | 2016-06-20 | 2017-02-15 | 武汉钢铁股份有限公司 | Secondary return ore recycling method for blast furnace |
| CN110331244A (en) * | 2019-06-28 | 2019-10-15 | 武汉钢铁有限公司 | A kind of blast furnace material distribution adjusting method of the more grade sinters of reasonable employment |
| CN111971400A (en) * | 2018-03-30 | 2020-11-20 | 杰富意钢铁株式会社 | Method for charging raw material into blast furnace |
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| US4400206A (en) * | 1981-05-28 | 1983-08-23 | Kawasaki Steel Corporation | Process for estimating particle size segregation of burden layer in blast furnace top |
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| US4400206A (en) * | 1981-05-28 | 1983-08-23 | Kawasaki Steel Corporation | Process for estimating particle size segregation of burden layer in blast furnace top |
| JP2011252200A (en) * | 2010-06-02 | 2011-12-15 | Jfe Steel Corp | Method for operating blast furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313215A (en) * | 2014-11-19 | 2015-01-28 | 中冶南方工程技术有限公司 | Blast furnace sinter graded feeding technology |
| CN104946829A (en) * | 2015-07-07 | 2015-09-30 | 山西太钢不锈钢股份有限公司 | Material distribution method for improving sintered ore utilization rate of 1800 m3 blast furnace |
| CN104946829B (en) * | 2015-07-07 | 2016-11-09 | 山西太钢不锈钢股份有限公司 | A kind of 1800 cubic metres of blast furnaces improve the distributing method of sintering deposit utilization rate |
| CN106399606A (en) * | 2016-06-20 | 2017-02-15 | 武汉钢铁股份有限公司 | Secondary return ore recycling method for blast furnace |
| CN111971400A (en) * | 2018-03-30 | 2020-11-20 | 杰富意钢铁株式会社 | Method for charging raw material into blast furnace |
| CN110331244A (en) * | 2019-06-28 | 2019-10-15 | 武汉钢铁有限公司 | A kind of blast furnace material distribution adjusting method of the more grade sinters of reasonable employment |
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Effective date of registration: 20170726 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Patentee before: Wuhan Iron & Steel (Group) Corp. |
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