Brief Induction of Pulverized Coal Injection

With the continuous expansion of the scale of blast furnace ironmaking and the increasing demand for pig iron, the demand for raw materials for blast furnace ironmaking is also increasing. Due to the aging of existing coke ovens, the environment is seriously polluted and the reserves of coking coal are increasing. The reduction has led to an increasingly tight supply of metallurgical coke, and people are seeking to replace some of the coke with new fuels.

injecting pulverized coal

The use of water-jet fuel in the blast furnace has become a means of saving coke and strengthening smelting. Blast furnace fuels can be divided into three categories: liquid fuels, such as heavy oil, tar, etc.; solid fuels, such as anthracite, bituminous coal, lignite, etc.; gas fuels, such as natural gas, coke oven gas, etc. The choice of fuel injection depends on the conditions of fuel resources in various countries, and changes with the change of resource richness. Since the injection technology was successful in France in the 1960s, the United States and Russia have mainly injected natural gas, and Western Europe and Japan have changed from injecting heavy oil to injecting pulverized coal since the early 1980s. China is an early country that developed coal injection technology. It has been tested since the 1960s and has a history of more than 40 years. Especially in the past decade, blast furnace coal injection technology has been widely used and developed.

Blast furnace coal injection is an important technological revolution for modern blast furnace ironmaking technology. Blast furnace coal injection is the direct injection of pulverized coal powder from the blast furnace tuyere into the furnace. The raw material for injecting pulverized coal may be anthracite, bituminous coal, lignite or mixed pulverized coal. The raw materials will be grounded into fine powders and became pulverized coal injection. The use of pulverized coal can replace coke and provide heat and reducing agent to the blast furnace. The use of injecting pulverized coal can promote the rapid development of the iron and steel industry, reduce the constraints of coke resources in ironmaking production, reduce investment and save costs, and protect the environment.