CN104131120B - Improve the Burden distribution method of blast furnace of agglomerate utilising efficiency - Google Patents
Improve the Burden distribution method of blast furnace of agglomerate utilising efficiency Download PDFInfo
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- CN104131120B CN104131120B CN201410349870.XA CN201410349870A CN104131120B CN 104131120 B CN104131120 B CN 104131120B CN 201410349870 A CN201410349870 A CN 201410349870A CN 104131120 B CN104131120 B CN 104131120B
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Abstract
The invention discloses a kind of Burden distribution method of blast furnace improving agglomerate utilising efficiency, comprise the following steps: 1) agglomerate weighed and sieve, particle diameter & lt; The agglomerate of 3mm is returned mine as secondary and is returned, and the agglomerate of particle diameter >=3mm is sent in blast furnace; 2) by entering stove sintered material, to control at the distributor chute angular displacement that fascinates be the cloth width of 7 ° ~ 9 °, and to control into stove sintered material radial edges to the distance of furnace wall to be that 1/15 ~ 1/10 of burner hearth internal diameter carries out cloth.The present invention breaks through the restriction that tradition enters stove agglomerate particle diameter need >=4mm, particle diameter is included in stove agglomerate at the sintering supplied materials of 3 ~ 4mm, improve small particle size agglomerate rate of utilization, and then improve the whole utilization efficiency of agglomerate, decrease quantity of return mines, alleviate production capacity and improve the sintering pressure brought, and original " coke-Large stone agglomerate-small particle size agglomerate " three step classification distributing modes are changed into " coke-sintering " two step one circulate distributing mode, simplify cloth flow process, improve efficiency.
Description
Technical field
The present invention relates to metallurgical technology, refer to a kind of Burden distribution method of blast furnace improving agglomerate utilising efficiency particularly.
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, the burden distribution system taked 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 O greatly
lparticle diameter D>=13mm, little burning is distributed in large radial outer periphery of burning, and the usage quantity of little burning is generally 22% of total sintered material, and returning mine as secondary for the sintered material of particle diameter D≤4mm sends back to sintering plant and again sinter.
Wuhan Iron and Steel Plant iron work adds No. 2 blast furnaces for 2011, the increase of blast furnace quantity adds the progress of blast furnace operating level, pig iron production capacity is made to be increased to 1,730 ten thousand tons from 2010 1,580 ten thousand tons, 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, and increase sinter machine and will certainly strengthen equipment investment, therefore, how not increase on the basis of equipment investment, alleviating sintering pressure just can be assistant officer's problem to be solved.
The Chinese invention patent being 201110316389.7 as application number discloses a kind of sinter grading charging method, the method has carried out classification to agglomerate by particle diameter, give the size of divided particle diameter and different-grain diameter agglomerate usage ratio and distributing mode, the method can play the ventilation property effectively 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 adds workload in sinter size grading, and it is high for current ore cost, the situation of raw material anxiety adopts sinter grading charging that the agglomerate of small particle size can be caused to can not get better utilised, improve sintering cost.
Summary of the invention
Object of the present invention is exactly to provide a kind of Burden distribution method of blast furnace improving agglomerate utilising efficiency, and the method significantly improves the utilising efficiency of small sinter, alleviates production capacity and improves the sintering pressure brought.
For achieving the above object, the technical solution used in the present invention is: a kind of Burden distribution method of blast furnace improving agglomerate utilising efficiency, comprises the following steps:
1) carried out weighing and sieving by agglomerate, the agglomerate of particle diameter <3mm is returned mine to return as secondary and is again sintered, and the agglomerate of particle diameter >=3mm is sent in blast furnace;
2) by described enter stove sintered material to control at the distributor chute angular displacement that fascinates be the cloth width of 7 ° ~ 9 °, and to enter stove sintered material radial edges described in controlling to the distance of furnace wall be that 1/15 ~ 1/10 of burner hearth internal diameter carries out cloth.
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 control at the distributor chute angular displacement that fascinates be the cloth width of 7 ° ~ 8 °, and to enter stove sintered material radial edges described in controlling to the distance of furnace wall be 1/12 ~ 1/10 of burner hearth internal diameter.
Further, described step 1) in, be that the agglomerate of 3 ~ 20mm is sent in blast furnace by particle diameter.
The analysis of causes that the present invention improves small particle size agglomerate rate of utilization is as follows: traditional view thinks that sinter grading charging is conducive to bulk cargo bed particle voids and increases, thus the ventilation property of blast furnace stock column can be improved, improve gas utilization rate, but this viewpoint considers 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, reflow conductor roll, chemical composition and microtexture etc. compare known, the Metallurgical Properties of Sinter of below 10mm grade and microtexture are better than the agglomerate of more than 10mm grade, wherein, particle diameter is that the metallurgical performance of 3 ~ 10mm agglomerate is best, 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, have 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 close, small sinter can't cause disadvantageous effect in middle high-temperature zone, as can be seen here, the agglomerate of Large stone is easy to efflorescence, be difficult to reduction, advantage is there is not in reflow conductor roll, small particle size agglomerate has more stable performance on the contrary, on the basis considering gas utilization rate and agglomerate utilization ratio, the small particle size agglomerate of particle diameter at 3 ~ 4mm is also included in agglomerate raw material by the present invention.
Compared with prior art, the present invention has the following advantages:
One, the present invention breaks through the restriction that tradition enters 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, the whole utilization efficiency of agglomerate is improved by efficiency utilization small particle size agglomerate, reduce quantity of return mines, alleviate production capacity and improve the sintering pressure brought.
Its two, the present invention, by cloth narrowed width, makes edge airflow be developed, and effectively prevent furnace wall dross phenomenon.
Its three, to be not only conducive to Sinter shaping for the quantity of return mines that the present invention reduces, and promotes the intensity of SINTERING PRODUCTION ability and agglomerate, and can reduce sintering fuel consumption, thus reduce sintering cost; The incoming air area of the more existing sinter grading charging distributing process of the present invention reduces 2%, and coke load improves 10%, and the raising of coke load reduce further production cost.
They are four years old, the present invention by original " coke-Large stone agglomerate-small particle size agglomerate " three step classification distributing modes change into " coke-sintering " two step one circulate distributing mode, simplify cloth flow process, saved and got the raw materials ready and the material loading time, and then improve blast-furnace smelting efficiency.
Accompanying drawing explanation
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, is convenient to more clearly understand the present invention, but they do not form restriction to the present invention.
Improve a Burden distribution method of blast furnace for agglomerate utilising efficiency, comprise the following steps:
1) directly sintering plant supplied materials is transported in the groove of ore deposit, weigh under the groove of ore deposit, sieved by vibrating screen under groove, the screen mesh size of vibrating screen under groove is 3mm, after screening, the agglomerate of particle diameter <3mm is returned mine as secondary and turn back to sintering plant and again sinter, and the agglomerate of particle diameter >=3mm, preferably the agglomerate of 3 ~ 20mm is then sent in blast furnace, and under groove, burden distribution matrix is the pattern of a batch of material " coke-sintering " in two steps;
2) as shown in Figure 1, when entering stove sintered material feeding blast furnace, being controlled at the distributor chute angular displacement that fascinates is the cloth width of 7 ° ~ 9 °, the preferred distributor chute angular displacement that fascinates is the cloth width of 8 °, the cloth width narrowed is conducive to developing edge airflow, thus reach center edge two strands of air balances, and to enter stove sintered material radial edges 2 described in controlling 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, incoming air area can be reduced 2% in actual production operation, preferred blast furnace air inlet area is 0.21 ~ 0.23m
3, blow through power to strengthen central gas stream to mineral aggregate layer, therefore suitably can improve the coke load of 10%, 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 that tradition enters stove agglomerate particle diameter need >=4mm, 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, the whole utilization efficiency of agglomerate is improved by efficiency utilization small particle size agglomerate, decrease quantity of return mines, alleviate production capacity and improve the sintering pressure brought; And this distributing process makes conditions of blast furnace more stable.
Claims (2)
1. improve a Burden distribution method of blast furnace for agglomerate utilising efficiency, comprise the following steps:
1) carried out weighing and sieving by agglomerate, the agglomerate of particle diameter <3mm is returned mine to return as secondary and is again sintered, and the agglomerate of particle diameter >=3mm is sent in blast furnace;
2) by described enter stove sintered material to control at the distributor chute angular displacement that fascinates be the cloth width of 7 ° ~ 8 °, and to enter stove sintered material radial edges described in controlling to the distance of furnace wall be that 1/12 ~ 1/10 of burner hearth internal diameter carries out cloth; Coke load is 4.9 ~ 5.2t/t; Described blast furnace air inlet area is 0.21 ~ 0.23m
3.
2. the Burden distribution method of blast furnace of raising agglomerate utilising efficiency according to claim 1, is characterized in that: described step 1) in, be that the agglomerate of 3 ~ 20mm is sent in blast furnace by particle diameter.
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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 |
| 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 |
| CN106399606B (en) * | 2016-06-20 | 2019-04-16 | 武汉钢铁有限公司 | The secondary recoverying and utilizing method of returning mine of blast furnace |
| JP6558518B1 (en) * | 2018-03-30 | 2019-08-14 | Ｊｆｅスチール株式会社 | Raw material charging method for blast furnace |
| CN110331244B (en) * | 2019-06-28 | 2021-04-13 | 武汉钢铁有限公司 | Blast furnace burden distribution adjusting method for reasonably using multi-grade sinter |
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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 |
| CN102321798A (en) * | 2011-10-18 | 2012-01-18 | 武汉钢铁(集团)公司 | Sinter grading charging method |
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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. |