Sintering method for reducing solid fuel consumption ratio

A technology of sintering method and fuel consumption ratio, which is applied in the field of sintering to reduce the solid fuel consumption ratio, and can solve problems such as high MgO content of unsintered ore, wear of injection pipes and coal injection guns, and influence of pulverized coal combustion, etc., to achieve reduction Effects of solid fuel consumption, stable combustion, and stable energy supply

Inactive Publication Date: 2020-12-18
美匡冶金技术研究院(苏州)有限公司
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  • Application Information

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Problems solved by technology

However, its injection volume is generally required to be less than 5%, too high will affect the combustion of pulverized coal
The hardness of carbonate alkaline fluxes is relatively high, which has a certain influence on the coal mill. During injection, the injection pipes and coal injection guns are severely worn; Solving the problem of high MgO content in sinter

Method used

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Embodiment Construction

[0017] The invention discloses a sintering method for reducing the solid fuel consumption ratio, comprising the following steps,

[0018] S1. Quantitative addition step, adding a special lower hopper at the position of the raw coal feeding belt, adding heavy magnesium oxide to the raw coal through the special lower hopper, adding heavy magnesia according to 1.0% to 10% of the raw coal feeding amount % join, and enter the raw coal bunker together with the raw coal;

[0019] S2, the mixed pulverized coal preparation process, the raw materials mixed in step S1 are sent to the coal mill to make mixed pulverized coal, wherein the oxygen content at the entrance of the coal mill is ≤ 7%, and the oxygen content at the outlet of the coal mill is ≤ 10%, The inlet temperature of the coal mill is 40-50°C lower than the ignition point of the mixed pulverized coal, and the outlet temperature of the coal mill is 75°C-85°C. The outlet temperature of the powder collector is ≤85°C, the proport...

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Abstract

The invention discloses a sintering method for reducing a solid fuel consumption ratio. Heavy magnesium oxide is added to raw coal to prepare pulverized coal, and the pulverized coal is sprayed into afurnace from a blast furnace tuyere; the content of MgO in sintering is reduced, and the utilization coefficient of a sintering machine is increased; the solid fuel consumption of sintered ore is reduced, and the cost of the sintered ore and blast furnace molten iron is reduced; the heavy magnesium oxide is added to the raw coal according to 1.0%-10.0% of the raw coal amount, and then injected into the blast furnace; the problems that an injected carbonate alkaline flux is high in hardness and poor in grindability, and a coal injection gun is abraded; the tuyere combustion temperature is reduced due to decomposition and heat absorption in the furnace are solved; and MgO in the sintered ore can be controlled in the optimal state of 1.2%-1.6%. Through control over the granularity and the heat value of the mixed pulverized coal, stable combustion and energy supply of the pulverized coal for the blast furnace are guaranteed.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a sintering method for reducing the solid fuel consumption ratio. Background technique [0002] With the development of my country's blast furnace ironmaking, domestic iron ore is far from meeting the needs of modern steel production, and a large number of foreign iron concentrate powders are pouring into the country, including some high-aluminum and high-iron concentrate powders from Pan-Eastern Europe and other places. The content of Al2O3 in the slag generally increases during the blast furnace smelting process. Slag is very important to blast furnace ironmaking process. MgO is an important component of blast furnace slag. With the increase of aluminum oxide content in slag, the presence of magnesium oxide can react with aluminum oxide, silicon dioxide, and silicate to form A series of low melting point compounds can disintegrate compound anions and reduce the ...

Claims

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Application Information

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IPC IPC(8): C21B5/04C21B5/00
CPCC21B5/003C21B5/008C21B5/04
Inventor 于原浩刘力永
Owner 美匡冶金技术研究院(苏州)有限公司
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