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Low-nitrogen combustion process for blast-furnace hot blast stove

A technology of low-nitrogen combustion and hot blast stove, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve environmental pollution and other problems, achieve the effect of improving atmospheric environment, less one-time investment, good environmental benefits and social benefits

Inactive Publication Date: 2020-08-28
鞍钢集团工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In blast furnace production, blast furnace hot blast stove flue gas contains dust particles, SO 2 , NOx and other harmful substances are likely to pollute the environment

Method used

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  • Low-nitrogen combustion process for blast-furnace hot blast stove
  • Low-nitrogen combustion process for blast-furnace hot blast stove

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Embodiment Construction

[0023] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0024] A low-nitrogen combustion process for a blast furnace hot blast stove according to the present invention, comprising:

[0025] Such as Figure 1-Figure 3 As shown, a secondary combustion air pipeline 3 is set between the combustion air inlet pipeline and the hot blast outlet pipeline outside the blast furnace hot blast stove; the corresponding end of the secondary combustion air pipeline 3 extends into the hot blast outlet pipeline and a secondary combustion air injector 1 is provided , the injection direction faces the inner side of the blast furnace hot blast stove; the secondary combustion air pipeline 3 is provided with a pressure transmitter 6, a flow meter 5 and a secondary combustion air regulating valve 4 in sequence along the flow direction of the combustion air; a pressure transmitter 6, a flow meter 5 and the secondary combustio...

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Abstract

The invention relates to a low-nitrogen combustion process for a blast-furnace hot blast stove. A combustion stage in the blast-furnace hot blast stove is divided into a primary combustion stage and asecondary combustion stage; the primary combustion stage refers to feeding combustion-supporting air, amount of which is less than theoretical air quantity needed for sufficiently combusting fuels, into the blast-furnace hot blast stove, and combusting the fuels under an oxygen-poor condition; and the secondary combustion stage refers to feeding combustion-supporting air, amount of which is morethan theoretical air quantity needed for sufficiently combusting the rest of the fuels, into the blast-furnace hot blast stove in the form of secondary air, and sufficiently combusting the rest of thefuels under an excess air condition. The low-nitrogen combustion process disclosed by the invention can effectively reduce NOx emission amount of the blast-furnace hot blast stove by 20%-40%, so thatrequirements of ultralow-emission standards are met.

Description

technical field [0001] The invention relates to the technical field of ultra-low emission of blast furnace hot blast stoves, in particular to a low-nitrogen combustion process for blast furnace hot blast stoves. Background technique [0002] As my country's environmental protection emission standards become more and more stringent, enterprises continue to increase pollution control efforts. In blast furnace production, blast furnace hot blast stove flue gas contains dust particles, SO 2 , NOx and other harmful substances are likely to pollute the environment. According to my country's ultra-low emission standards, the emission of harmful substances in blast furnace hot blast stove flue gas is particulate matter, SO 2 , NOx emission indicators are 10mg / m 3 , 50mg / m 3 , 200mg / m 3 the following. Among these harmful substances, NOx is mainly produced by the high-temperature hot air burned in the hot blast stove. Therefore, the reduction of NOx in the combustion products of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B9/00C21B9/10
CPCC21B9/00C21B9/10
Inventor 李益民赵波李世明潘涛杨占春徐平
Owner 鞍钢集团工程技术有限公司