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A smelting method for a large-scale bellless blast furnace using a high proportion of medium lump coke

A smelting method and a bellless technology, which are applied in the smelting field of large-scale bellless blast furnaces using a high proportion of medium lump coke, can solve the problem of no positive proposal for a smelting method using a high proportion of medium lump coke, etc., and achieve the effect of eliminating adverse effects.

Active Publication Date: 2022-07-19
ANGANG STEEL CO LTD
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  • Summary
  • 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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  • A smelting method for a large-scale bellless blast furnace using a high proportion of medium lump coke
  • A smelting method for a large-scale bellless blast furnace using a high proportion of medium lump coke
  • A smelting method for a large-scale bellless blast furnace using a high proportion of medium lump coke

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0026] ①, take S 中 =1, S 总 ==8 (take an even number, excluding the number of small coke 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 =(270×58.60×8÷2÷1000-5.6)÷3=19.23t / batch.

...

Embodiment 2

[0042] When the blast furnace uses 250Kg / t bulk coke ratio, 100Kg / t medium coke ratio (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 block batches in each cycle, S 总 is the total number of batches of ore coke in each cycle, S 大 Number of batches of bulk coke per cycle, P 中 is the batch weight of the medium block, P 大 For bulk batch weight, P T Small coke batch weight, Q 批 is the iron content of each batch of ore, a is the proportion of central coke, K 中 is the medium focal ratio, 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.

[0047] ④、P T =P 中 ×S 中 ×a, t...

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Abstract

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 coke in a high proportion. It is proposed to use the method of small coke distribution to avoid the distribution of medium coke into the center of the blast furnace. In view of the large amount of use of medium coke, it is proposed to improve the structure of the air break, and to adopt the method of equalizing the load and adding pot coke in the center to guide the development of the central air flow and recover quickly. ; Propose methods to properly increase edge load and mass heavy smelting to restrain the development of edge airflow; propose to strengthen the tapping structure before the furnace, standardize the amount of mud, stabilize the depth of the tap hole, and ensure the effective time of tapping. Taking these measures in the production of high proportion of medium lump coke can successfully prevent the medium lump coke from being distributed into the center of the blast furnace and affect the quality of the core coke without reducing the coke load, and ensure that the blast furnace can recover quickly after the blast furnace is turned off, and can be stable in daily operation. The edge gas flow develops the central air flow, which is conducive to activating the hearth and ensuring the long-term stability of the blast furnace.

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 coke in a high proportion. Background technique [0002] In the field of metallurgical coke, the particle size of large 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 is generally about 12%, and when it exceeds 20%, the proportion is high. Production; due to insufficient coking capacity, the blast furnace began to use a large amount of floor-to-ceiling medium coke for production. The ratio of medium lump coke was up to 110Kg / t, accounting for 31.4% of the coke entering the furnace. When the ratio of medium lump coke increased to 70Kg / tFe, the blast furnace appeared forward. With some minor changes, the air volume begins to shrink, the air pressure increases and the stability becomes worse, the a...

Claims

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Application Information

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Patent Type & Authority Patents(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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