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Method for heating special steel with low-heat-value blast furnace coal gas

A blast furnace gas and special steel technology, applied in blast furnaces, heat treatment furnaces, blast furnace details, etc., to reduce the exhaust gas temperature, improve the heating quality, and stabilize the combustion effect

Active Publication Date: 2013-12-18
BEIJING SHOUGANG INT ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of using high calorific value fuel for traditional special steel heating

Method used

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  • Method for heating special steel with low-heat-value blast furnace coal gas
  • Method for heating special steel with low-heat-value blast furnace coal gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0022] Taking the 140t / h special steel heating furnace of Jiangsu Zhongtian Iron and Steel Group as an example, the heating furnace adopts 5-stage furnace temperature control. Section 1, the first heating section 2, the second heating section 3, the third heating section 4 and the soaking section 5 control the heating temperature of each heating section according to the heating process requirements of each steel type, and the implementation method is as follows:

[0023] (1) On the heating furnace, air and gas double regenerative combustion control mode is adopted, and a tail flue 6, a chimney and a 5m-long preheating section 1 without burners are left at the end of the furnace. By adjusting the first heating section 2 The section air-smoke regulating valve 13 and the section soot regulating valve 17 reduce the amount of flue gas entering the air and gas double regenerative storage type regenerative burner 7 from 100% to 50%, and the remaining 50% of the flue gas It flows long...

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Abstract

The invention relates to a method for heating special steel with low-heat-value blast furnace coal gas, belonging to the technical field of industrial furnaces. According to the method, an air / coal gas double-heat-accumulation combustion control mode, a sequential cutoff combustion control mode, an alternate cutoff combustion control mode and an air / coal gas double-heat-accumulation vertical partition type heat accumulation type burner are used in a special steel heating furnace, thus realizing the technological requirements that the special steel is slowly heated at in-furnace low temperature and is prevented from oxidation and decarburization at high temperature. According to the invention, the method provided by the invention breaks the heating method that the special steel heating furnace can only use high-heat-value coal gas as fuel, improves the product quality and yield, reduces the fuel consumption, widens the air / coal gas double-heat-accumulation application range, and has great economic benefits, social benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of industrial furnaces, in particular to a method for heating special steel with blast furnace gas with low calorific value. Background technique [0002] Energy is an important material basis and guarantee for national economic and social development. The ever-increasing energy consumption will inevitably lead to an increase in pollution emissions, so energy conservation and emission reduction in iron and steel enterprises has become an urgent issue. In the past, blast furnace gas, a by-product produced by iron and steel enterprises, could not be applied to steel rolling heating furnaces due to its low theoretical combustion temperature. It is directly applied to the steel rolling heating furnace to realize turning waste into treasure, and at the same time achieve the goals of energy saving and environmental protection. Double regenerative combustion expands the combustion area by organizing oxygen-lean c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/06C21D9/70
Inventor 陈迪安侯俊达苗为人汪小龙王惠家陈国海江波蹇军强刘学民刘燕燕高文葆刘磊李浩李文李辉解长举
Owner BEIJING SHOUGANG INT ENG TECH
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