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Method for canceling center coke charging of blast furnace

A blast furnace, ore-coke ratio technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as poor central coke cancellation and poor blast furnace operation status

Active Publication Date: 2013-02-06
SHOUGANG JINGTANG IRON & STEEL CO LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for canceling the center coking of the blast furnace, which solves the existing technology of the center coking of the blast furnace. The state becomes worse, etc., making the blast furnace go forward and form a problem of dependence on central coking

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  • Method for canceling center coke charging of blast furnace

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Embodiment Construction

[0020] The method for canceling coking at the center of the blast furnace provided by the embodiment of the present invention includes:

[0021] The first step is to control the blast furnace by stabilizing the gas intensity at the edge of the blast furnace and increasing the gas intensity at the center of the blast furnace when the operation of the blast furnace is poor, so that the operation of the blast furnace tends to be relatively stable. This step also includes the following three aspects:

[0022] First of all, the determination and adjustment of the charging system. According to the conditions of raw materials and fuels, a standard is provided for judging the matching of the blast furnace edge and center temperature, that is, if the two are properly matched, the pressure-volume relationship is stable, that is, at the full wind level (full wind level = blast furnace effective volume * 1.5 ) The downwind volume and wind pressure fluctuations are small, except for the h...

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Abstract

The invention discloses a method for canceling center coke charging of a blast furnace. The method comprise the following steps: when the blast furnace operates poorly, stabilizing the intensity of coal gas on the edge of the blast furnace and improving the intensity of the coal gas at the center of the blast furnace to control the blast furnace, so that the operation of the blast furnace tends to be relatively stable; when the operation of the blast furnace is relatively stable, stabilizing the intensity of the coal gas at the center of the blast furnace and considering the intensity of the coal gas on the edge of the blast furnace to improve the indexes of the blast furnace, so that the blast furnace tends to operate well; and after the blast furnace changes from poor operation to good operation, directly canceling center coke charging if the following conditions appear at the same time: the central temperature of the blast furnace is higher than 700 DEG C, the utilization ratio of the coal gas is 2% lower than that that in stable operation, the coal gas is unstable, and the Si content in melted iron is averagely below 0.25, thereby further improving the utilization ratio of blast furnace coal gas, reducing fuel ratio and providing better economic benefits.

Description

technical field [0001] The invention relates to the technical field of ironmaking engineering, in particular to a method for canceling coking at the center of a blast furnace. Background technique [0002] The technology of central coking is a useful technology when the condition of raw materials and fuels is poor. For bellless blast furnaces, coking can be conveniently added to the center. Center coking is to add a small amount of coke from the top of the furnace to the center of the blast furnace to reduce the ore-coke ratio in the narrow range of the center of the blast furnace, so that the air permeability of the center can be improved, so that more air can pass through. Due to the good air permeability and high temperature in the center, it is helpful to form an inverted V-shaped soft melting zone, which is beneficial to the direct movement of the blast furnace. [0003] However, when the raw materials and fuels are generally stable, central coking will also bring some...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 张贺顺王晓鹏任立军王友良王刚毅甄昆泰陈艳波黄俊杰
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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