Moskalyna A. Improving the energy efficiency of blast furnace using pulverized coal based on the full energy balance.

Blast furnace. Energy efficiency of blast furnace thermal operation using coal dust in conjunction with oxygen converter production. The principles of system analysis and block method of studying the thermal operation of a blast furnace in relation to oxygen-converter production are used in the work. To determine the energy-efficient modes of blast furnace operation using pulverized coal (PCI) in conjunction with oxygen converter production, a complete energy balance method is adapted to blast furnace combining joint calculation and consideration of material, heat and energy balances. For the first time a method of calculating the total energy balance of blast furnace melting under the conditions of using coal dust in blast furnace production in relation to the requirements of steel production was developed. The regularities and quantitative assessment of the influence of coal grades and elements of the chemical composition of PCI on the thermal power and exergy indicators of blast furnace melting were specified. The regularities, the feasibility and the quantitative assessment of the effect of preheating PCI before its filing in the blast furnace and the injection of pulverized iron oxides on the heat and exergy indicators of blast furnace melting were specified. The regularities and quantitative estimation of the influence of PCI and natural gas application in separate and joint injection into the blast furnace, the change of the silicon content in the iron and its temperature on the distribution of exergy streams and environmental indicators in the "blast furnace – oxygen converter" plant technological system are specified. Implemented. Metallurgy.