Abstract
The aim of the work is to study the effect of pulverized coal (PCI) on the energy indicators of the technological system of steel production «blast furnace-oxygen converter». The analysis of energy use in the technological system for the best actual periods of operation of the blast furnace (BF) using only natural gas, pulverized coal and co-injection of pulverized coal with natural gas is performed. It is shown that the technology of using PCI improves technical and economic indicators and has a positive effect on the distribution of exergic flows, exergic efficiency and environmental indicators in the system «blast furnace-oxygen converter». Comparative heat and energy and exergy analysis of actual pulverized coal consumption in the amount of 135 kg/t of pig iron compared to blowing only natural gas in the amount of 35 m3/t of pig iron showed that pulverized coal leads to a decrease in coke consumption by ~ 25% due to pulverized pulverized coal. An exergetic analysis of the predicted converter heats showed that the injection of pulverized coal to the pulpwood leads to a decrease in the total exergy supplied by ~7%, and in the case of co-application of pulverized coal with natural gas, the exergy decreases by ~ 2%. Analysis of the exergy balance of converter melting showed that a change in the consumption of pulverized coal and natural gas in the blast furnace production slightly affects the change in the exergic efficiency (up to 0.4%). In general, it is shown that the technology of using PCI improves technical and economic indicators and positively affects the distribution of exergic flows, exergic efficiency and environmental indicators in the blast furnace – oxygen converter system.
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