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Pre-heating technique of blast furnace before blowing coal powder

A blast furnace and pulverized coal technology, which is applied in the field of blast furnace preheating before pulverized coal injection can solve problems such as unreported process devices and operation methods, and achieves the benefits of pipeline transportation, good economic benefits, and reduction in the cost per ton of iron. Effect

Inactive Publication Date: 2009-09-02
SHANXI LUAN MINING GRP +1
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Problems solved by technology

[0005] "Coal Injection Operation of ThyssenKrupp Blast Furnace" published in the 2nd issue of "Anshan Iron and Steel Technology" in 2006 introduced that the company had conducted a preheating injection test of coal powder on an industrial blast furnace, but the process used The device and method of operation have not been reported

Method used

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  • Pre-heating technique of blast furnace before blowing coal powder

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Embodiment Construction

[0017] A preheating process before pulverized coal injection for blast furnace injection, which is characterized in that the pulverized coal is heated to 120-160°C before the pulverized coal enters the blast furnace for combustion. figure 1 The schematic heating device includes a multi-stage segmented heating delivery pipe 2, a combustion furnace 5 connected to a waste heat pipe 6, a blast furnace gas pipe 7 is connected to the combustion furnace 5, and the combustion furnace 5 is connected to a heat exchanger 8. Such as figure 2 As shown, the multi-stage segmented heating delivery pipe includes four heating units connected together, and each heating unit is formed by socketing the inner delivery pipe 11 and the outer heating pipe 12, the delivery pipe 11 and the heating The two ends of the tube 12 are closed. The heating tube 12 has a medium inlet 10 and a medium outlet 13 respectively. There are connecting flanges 9 at both ends of the heating unit, and an expansion joint 1...

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Abstract

The invention relates to a matching technology in blast furnace iron-smelting process for metallurgical industry, in particular to a preheating technology before a blast furnace sprays coal powder, which solves the problem of the realization of coal powder preheating spraying technology in industry. A preheating technology before the blast furnace sprays coal powder heats up coal powder to 120-160 DEG C with the blast furnace high temperature waste gas which is produced by a blast furnace hot blast stove before coal powder is sprayed into the blast furnace, thereby largely reducing the time of coal powder from heating up in a blast furnace air opening to firing, and increasing the combustion time of coal powder in the air opening and a convolution region, thereby increasing the combustion rate of coal powder, reducing the unfavorable affects of the non combusted coal powder for the blast furnace, increasing coal-to-coke replacement, and enlarging coal spraying quantity.

Description

technical field [0001] The invention relates to a matching process in the blast furnace ironmaking process in the metallurgical industry, in particular to a preheating process before blowing coal dust into the blast furnace. Background technique [0002] Blast furnace injection technology is to inject finely ground coal powder directly into the blast furnace to replace the resource-poor and expensive metallurgical coke, which acts as a heat generating agent and reducing agent, thereby reducing the coke ratio and pig iron cost, and is an important tool for iron and steel enterprises to save coke and increase production. As one of the most effective measures to improve the smelting process, more than 90% of the pig iron is smelted by the fuel-injected blast furnace. [0003] However, with the increase of the injection volume, after the coal injection ratio increases to a certain limit, the reduction of the coke ratio will be greatly reduced. The main reason is that the injecte...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/16C21B7/00
Inventor 刘仁生王宏强刘新斌房连增
Owner SHANXI LUAN MINING GRP
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