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Smelting method for medium coke used in large bell-less blast furnace in high proportion

A smelting method and bell-less technology, which is applied in the smelting field of large-scale bell-less blast furnaces where a high proportion of medium coke is used, can solve the problems such as no positive proposal for a high proportion of medium coke smelting method, and achieve long-term stability. , the effect of eliminating adverse effects

Active Publication Date: 2021-04-06
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method does not completely avoid the distribution of medium coke into the center of the blast furnace, nor does it positively propose a smelting method that uses a high proportion of medium coke, and in fact there are still the same batch of medium coke and large coke that adopt the same system of distribution

Method used

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  • Smelting method for medium coke used in large bell-less blast furnace in high proportion
  • Smelting method for medium coke used in large bell-less blast furnace in high proportion
  • Smelting method for medium coke used in large bell-less blast furnace in high proportion

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Experimental program
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Effect test

Embodiment 1

[0024] When the blast furnace uses 270Kg / t of bulk coke, 80Kg / t of medium coke (the proportion of medium coke accounts for 22.8% of the coke entering the furnace), and 58.60t / batch iron batch smelting, the specific countermeasures are as follows:

[0025] 1. Small focus cloth parameter selection (S 中 is the number of medium block batches in each cycle, S 总 is the total number of ore coke batches in each cycle, S 大 is the number of bulk coke batches per cycle, P 中 is the medium batch weight, P 大 is the bulk batch weight, P T Batch weight of small focus, Q 批 is the iron content of each batch of ore, a is the proportion of central coke, K 中 is the focal ratio of the middle block, K 大 is the bulk focal ratio):

[0026] ①, take S 中 = 1, S 总 ==8 (take an even number, not including the number of small focus batches), then S 大 =8÷2-1=3;

[0027] ②, P 中 =K 中 ×Q 批 ×S 总 ÷2÷S 中 ÷1000=80×58.60×8÷2÷1÷1000=18.76t / batch.

[0028] ③, P 大 =(K 大 ×Q 批 ×S 总 ÷2÷1000-P T )÷S 大...

Embodiment 2

[0042] When the blast furnace uses a large coke ratio of 250Kg / t, a medium coke ratio of 100Kg / t (the medium coke ratio accounts for 28.6% of the furnace coke ratio), and batch iron 58.60t / batch smelting, the specific countermeasures are as follows:

[0043] 1. Small focus cloth parameter selection (S 中 is the number of medium block batches in each cycle, S 总 is the total number of ore coke batches in each cycle, S 大 is the number of bulk coke batches per cycle, P 中 is the medium batch weight, P 大 is the bulk batch weight, P T Batch weight of small focus, Q 批 is the iron content of each batch of ore, a is the proportion of central coke, K 中 is the focal ratio of the middle block, K 大 is the bulk focal ratio):

[0044] ①, take S 中 = 1, S 总 ==6 (take an even number), then S 大 =6÷2-1=2;

[0045] ②, P 中 = K 中 ×Q 批 ×S 总 ÷2÷S 中 ÷1000=100×58.60×6÷2÷1÷1000=17.58t / batch.

[0046] ③, P 大 =(K 大 ×Q 批 ×S 总 ÷2÷1000-P T )÷S 大 =(250×58.60×8÷2÷1000-5.2)÷2=19.38t / batch. ...

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Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to a smelting method for medium coke used in a large bell-less blast furnace in a high proportion. According to the smelting method, medium coke is prevented from being distributed into the center of the blast furnace by a small coke distribution method, a damping-down material improving structure is proposed after a large amount of medium coke is used, and central airflow development and rapid recovery are guided by adopting a load sharing and central tank coke adding method; a proper edge load increasing and large batch weight smelting method is provided to inhibit edge airflow development; and a stokehole tapping structure is enhanced, the clay ramming amount is standardized, the iron notch depth is stabilized, and the effective tapping time is guaranteed. These measures are adopted when the medium coke used in the high proportion is produced, so that the medium coke can be successfully prevented from being distributed into the center of the blast furnace to influence the quality of furnace core coke under the condition of not reducing coke load, rapid recovery after damping down of the blast furnace is guaranteed, edge coal airflow can be stabilized and the central airflow can be developed in daily operation, a hearth is facilitated to be active, and long-term stable smooth operation of the blast furnace is ensured.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a smelting method for a large-scale bellless blast furnace using medium lump coke at a high proportion. Background technique [0002] In the field of metallurgical coke, the particle size of bulk coke is generally 40-60mm, and the particle size of medium coke is generally 20-40mm. The proportion of medium coke used in large blast furnaces in normal production is generally about 12%, and it is high when it exceeds 20%. Production: due to insufficient coking capacity, blast furnaces began to use a large number of floor-to-ceiling cokes for production. The coke ratio of medium cokes reached up to 110Kg / t, accounting for 31.4% of the coke ratio in the furnace. With some minor changes, the air volume began to shrink, the wind pressure increased and the stability deteriorated, the air permeability decreased, the antegrade state deteriorated, and the phenomenon of oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/007
Inventor 吴官印姜彦冰蒋益李伟伟龚继兵何冲张智勇赵华
Owner ANGANG STEEL CO LTD
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