Pulverized coal injection preheating combustion device and method for ironmaking process

A combustion device and pulverized coal technology, which are applied in combustion methods, combustion control, combustion equipment, etc., can solve the problems of lack of economy, high manufacturing cost of heat exchangers, and increase the temperature of pulverized coal, so as to increase the amount of coal injection, improve the Efficiency, the effect of reducing clogging

Active Publication Date: 2016-04-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the density and specific heat capacity of pulverized coal are greater than that of gas, it is difficult to greatly increase the temperature of pulverized coal simply by using the physical heat of flue gas or hot air.
Also, heat exchangers are usually expensive to manufacture and lack economical

Method used

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  • Pulverized coal injection preheating combustion device and method for ironmaking process

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Embodiment Construction

[0026] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0027] For better illustrating the present invention, facilitate understanding technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:

[0028] A pulverized coal injection preheating combustion device for ironmaking process, the device includes a preheating chamber 3 and a pulverized coal combustion chamber 5 communicating with it; the front end of the preheating chamber 3 is respectively connected with a high-concentration pulverized coal pipeline 1 and a A secondary air duct 2; a blunt body 6 is arranged in the pulverized coal combustion chamber 5; an igniter 4 is arranged below the blunt body 6.

[0029] The position of the blunt body 6 in the pulverized coal combustion chamber 5 is adjustable.

[0030] A nitrogen purging device 7 is...

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Abstract

The invention relates to a device and method for preheating combustion of jetting pulverized coal used in an iron-making process, and belongs to the field of pulverized-coal combustion during iron and steel smelting, and aims to provide a blast furnace and a smelting reduction iron-making furnace (for example, COREX and FINEX). The technical characteristic of the device and method is that the temperature of an integral pulverized coal flow is increased due to heat emitted during uncompleted combustion of partial pulverized coal. Experimental results show that the preheating combustion device can preheat the pulverized coal flow to be hotter than 300 DEG C, and the residual liquid deposition can be higher than 50 percent.

Description

technical field [0001] The invention relates to a preheating combustion device and a preheating combustion method suitable for pulverized coal injection in ironmaking blast furnaces or smelting reduction furnaces, and belongs to the cross field of combustion technology and smelting technology. Background technique [0002] Blast furnace ironmaking and molten ironmaking (such as COREX, FINEX) both use coke as part of the fuel. Coking coal is required for coke production, and the coking process is likely to cause serious environmental pollution. Pulverized coal injection is an important way to reduce coke consumption and production costs . Therefore, the development of blast furnace coal injection and COREX coal injection technology is one of the key technologies of the current ironmaking process. [0003] COREX uses 80-90% lump coal or briquette coal as the main fuel. The cost of lump coal is high and a large amount of pulverized coal will be produced during transportation. ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): F23C7/02F23K3/02F23N1/02C21B5/00C21B7/00C21B11/00
Inventor丁玉龙黄云徐万仁王述浩
OwnerINST OF PROCESS ENG CHINESE ACAD OF SCI