Abstract
AbstractThe change regulations of the smelting parameters in a gas-injection blast furnace are investigated using theoretical calculations. The results show that when the volume of gas injected, the oxygen enrichment rate and the theoretical combustion temperature of tuyere are 600 m3/tHM, 10% and 1950~2200∘C, respectively, the conditions meet the smelting requirements of a blast furnace. With the increase of the oxygen enrichment rate, the required air volume decreases, the contents of CO and H2 in the top gas increase, and the content of CO2 first increases and then decreases.With an increase of the volume of gas injected, the coke rate decreases. In addition, when the oxygen enrichment rate and the volume of gas injected are 10% and 600 m3/tHM, respectively, the CO content of the top gas constantly increases with the increase of the coke rate, while the H2 and CO2 contents both decrease. With the increase of the H2 content in the gas, the direct reduction degree of iron gradually decreases and the volume shrinkage burden increases. Apparently, injecting gas into the blast furnace can prevent the theoretical combustion temperature from being too high and solve the contradiction between the upper cooling and lower heating of the blast furnace.
Highlights
The change regulations of the smelting parameters in a gas-injection blast furnace are investigated using theoretical calculations
The results show that when the volume of gas injected, the oxygen enrichment rate and the theoretical combustion temperature of tuyere are 600 m3/tHM, 10% and 1950~2200∘C, respectively, the conditions meet the smelting requirements of a blast furnace
The raw material used in the process of gas injection is the field data of a 2500 m3 blast furnace at Handan Iron and Steel Company based on 200 kg pulverized coal, in which gas serving as the alternative to pulverized coal is injected into the blast furnace
Summary
Abstract: The change regulations of the smelting parameters in a gas-injection blast furnace are investigated using theoretical calculations. The results show that when the volume of gas injected, the oxygen enrichment rate and the theoretical combustion temperature of tuyere are 600 m3/tHM, 10% and 1950~2200∘C, respectively, the conditions meet the smelting requirements of a blast furnace. Oxygen enrichment and pulverized coal injection lead to the heat distribution of the blast furnace differentiating into "upper cooling" and "lower heating", and as a result, some measures have to be taken to meet the requirement of heating in the upper part of the blast furnace. The most important characteristic of this process is that the combustion of pulverized coal in the blast furnace tuyere is moved into the gasifier, and the BF top gas is injected into the gasifier. Through the comparison of the smelting effects between the new process and the conventional blast furnace process, the operating characteristics and advantages of the new process are obtained
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