Large blast furnace mixed injection meager lean coal application method

An application method and technology of lean and lean coal, applied in the field of smelting, can solve the problems of insufficient supply, low resource reserves of high-quality anthracite coal, and rising price of anthracite, so as to reduce production costs, obtain social environmental protection benefits, and reduce environmental pollution.

Inactive Publication Date: 2018-05-29
BENGANG STEEL PLATES
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

In the past, the coal used for blast furnace injection in my country's iron and steel enterprises was generally anthracite, but the high-quality anthracite resources suitable for blast furnace injection were scarce and in short supply, and the price of anthracite continued to rise, which could no longer meet the needs of blast furnace coal injection technology and actual development.

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Embodiment Construction

[0014] A method for applying mixed injection of lean coal in a large blast furnace. The ratio of anthracite, bituminous coal and lean coal is: anthracite: bituminous coal: lean coal = 70-72:10-12:20-21;

[0015] Bituminous coal has a carbon content of 75%-90%, a density of 1.2-1.5, and a volatile matter of about 10%-40%. Relative density 1.25~1.35, calorific value 27170-37200 kJ / kg (6500-8900 kcal / kg);

[0016] Anthracite has a carbon content of more than 90%, a volatile matter of less than 10%, and no colloidal layer thickness. The calorific value is about 6000-6500 kcal / kg.

[0017] The indicators of lean coal are as follows, 5500 kcal, moisture less than 6, volatile content 12-18, sulfur content less than 1.5.

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Abstract

The invention discloses a large blast furnace mixed injection meager lean coal application method. According to the component weight ratio, anthracite: bituminous coal: lean coal is 70-72:10-12:20-21.The method has the beneficial effects that the deficiency of excellent coal resources is relieved, and blast furnace normal production needs are ensured; the enterprise production cost is reduced, and energy-saving consumption-reducing aims are achieved; environment pollutions caused by coking are reduced, and the social environment-friendly benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a fuel ratio for a large-scale blast furnace injection coal system. Background technique [0002] Blast furnace coal injection refers to the direct injection of finely ground coal powder from the blast furnace tuyere into the furnace to replace coke to provide heat and reducer. It is one of the most effective measures to reduce the coke ratio and is also a first step in modern blast furnace smelting. A major technological breakthrough. [0003] As the world's largest iron-making country, my country's steel production statistics released by the National Bureau of Statistics in 2015 show that the total national steel production is about 1.1235 billion tons. Excluding the production data due to repeated processing and repeated statistics, the total actual steel production is about 779.5 million tons. . With the rapid growth of steel production capacity, coking coal and coke resour...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/003C21B5/007C21B5/008
Inventor 朱卫刚张军王金辉耿君臣
Owner BENGANG STEEL PLATES
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