Abstract
The method for calculating indicators of blast furnace smelting with replacement of part of coke with additional fuels has been developed on the basis of full and complex compensation and compensating measures. Efficiency of the use of natural gas and pulverized coal in the blast furnace conditions of the Enakievo Metallurgical Plant was calculated and it has been confirmed as rather high. Increase in the consumption of natural gas from the baseline (71.8 m3/t of iron) to 110 m3/t ensures a corresponding increase in productivity of the blast furnace to 107.6 % and a decrease in the consumption of coke to 417.3 kg/t of iron (–38.4 kg/t, –8.42 %). Replacing natural gas with pulverized coal in the amount of 160 kg/t of iron made it possible to completely remove it from the blast. At the same time, coke consumption decreased to 354.59 kg/t of iron (–101.1 kg/t; –22.18 %). Increasing the consumption of pulverized coal fuel up to 200 kg/t of iron with compensation of the blast temperature of1200 °Cand oxygen of the blast of 25 % provides an increase in the productivity of the blast furnace to 105.8 % and reduction of coke consumption to 303.8 kg/t of iron (–151.9 kg/t, –33.33 %). High efficiency of the use of pulverized coal in conditions of the Enakievo Metallurgical Plant is explained by its lower cost compared to natural gas, high carbon content in coal and a significantly lower effecton the theoretical combustion temperature and other technological parameters.
Highlights
The method for calculating indicators of blast furnace smelting with replacement of part of coke with additional fuels has been developed on the basis of full and complex compensation and compensating measures
Increase in the consumption of natural gas from the baseline (71.8 m3/t of iron) to 110 m3/t ensures a corresponding increase in productivity of the blast furnace to 107.6 % and a decrease in the consumption of coke to 417.3 kg/t of iron (–38.4 kg/t, –8.42 %)
Coke consumption decreased to 354.59 kg/t of iron (–101.1 kg/t; –22.18 %)
Summary
Выполнены расчеты изменения технико-экономических показателей доменной плавки при изменении расхода ПГ от 72 до 140 м3/т чугуна и ПУТ от 0 до 200 кг/т чугуна при использовании следующих компенсирующих факторов: вывод ПГ, повышение температуры дутья до 1150 и 1200 °С и повышение содержания кислорода в дутье до 26 %. Данные расчетов эффективности вдувания ПГ приведены в табл. 3 указаны режимы работы доменной печи: базовый режим 1 (расход ПГ составляет [71,8] м3/т чугуна), повышение температуры дутья до 1150 и 1200 °С (соответственно режимы 2 и 3) и после достижения температуры дутья 1200 °С повышение содержания кислорода в дутье до [24, 25] и 26 % (режимы [4, 5, 6]). На основании промышленного опыта и расчетов принимали, что по мере.
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