Blast furnace shutdown method

A blast furnace and furnace adjustment technology, which is applied in the field of blast furnace smelting to achieve the effect of rapid furnace shutdown

Pending Publication Date: 2022-06-14
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: how to stop the furnace safely and stably during the shutdown process, and reduce the pollution to the environment during the shutdown process

Method used

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  • Blast furnace shutdown method

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Embodiment Construction

[0014] During the blast furnace shutdown process, it is estimated that the material line is 10.0-13.5m after the pre-shutdown air. After the blast furnace is supplied, the amount of water on the top of the furnace is adjusted according to the direction of the furnace top temperature, and the unidirectional furnace top temperature during the shutdown process is controlled to be ≮95 ℃, to prevent the temperature in this direction from being too low, the condensed water will flow down the blast furnace skin and reach the high temperature zone in the lower part of the blast furnace, where it will decompose to generate hydrogen and peroxygen and cause an explosion. The furnace top gas was measured by manual, online analyzer and spectrometer every 0.5h, and analyzed by comparison. During the shutdown process, the air volume is reduced or adjusted according to the pressure difference in the furnace and the air permeability index, so as to prevent the pipeline from being blown out unde...

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Abstract

The invention relates to the field of blast furnace smelting. According to the blast furnace blowing-out method, the furnace top water drawing amount and the air supply amount are adjusted so that the blast furnace top temperature can be larger than or equal to 95 DEG C in the whole blowing-out process, in the adjusting process, the water drawing amount is preferentially adopted for control, and when water drawing amount control cannot meet the requirement, the air supply amount is adjusted; in the empty stock line process, the furnace top temperature is controlled to be 450-500 DEG C, and after the stock line passes through an inflection point, the highest temperature of a soft melting zone is smaller than or equal to 600 DEG C, the temperature of an airtight box for charging at the furnace top is lower than 60 DEG C, the nitrogen consumption is 40000-6000 m < 3 >/h, and the pressure is 0.5-0.7 mpa. In the blowing-out process, air is gradually reduced according to the components of the furnace top gas, and the pressure difference is controlled.

Description

technical field [0001] The invention relates to the field of blast furnace smelting. Background technique [0002] In recent years, with the upgrading and transformation of the iron and steel industry, the environmental protection requirements have been continuously increased. Although a large number of blast furnaces with advanced technical equipment, environmental protection standards during production, good energy consumption indicators and good technical and economic indicators, with the increase of service time, a large number of blast furnaces have to wait for the service life. After the expiration date, the blast furnace needs to be shut down for the empty material line. How to safely, environmentally friendly and smoothly shut down these blast furnaces is a technical difficulty in blast furnace ironmaking production, and production accidents such as safety and environmental protection are easy to occur if the control is not good. During the shutdown process of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B5/06
CPCC21B5/00C21B5/06
Inventor 郝计根阮根基郑毅范立伟
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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