OP-II-3

PP-III-74stove heating. Another part of the blast-furnace gas enters the gas network of themetallurgical works, and is used as a gas fuel by other workshops. About 50% ofblast furnace gas enters the converter, burns in it supporting the temperature of 1050– 1100 °C inside the converter. Smoke fumes which are formed, leave the converterand pass through the recuperator and release into the smokestack. Mixture of steamand natural gas heated to 400 °C passes through the recuperator and enters the gaspipe of reformer, filled with catalyst, where steam conversion runs. Converted gasenters the upper row of the blast furnace lances at the bottom of the blast furnacestack. Hot blast with the temperature of 1250 °C and pulverized coal enter the blastfurnacehearth through the lower lances.The proposed technology of blast-furnace melting is based on the concept ofautonomy of the upper and lower zone of a blast furnace. Pulverized coal feed (PCF)injected into the blast-furnace hearth reduces the lack of heat in the hearth and cokespecific consumption due to its direct replacement of coal dust. Hot reducing gasessupplied into the blast furnace stack eliminate the lack of reducing gases in thissection and bring down the coke specific consumption due to more completereduction of iron oxides by gases and descent of the direct iron reduction. If hotreducing gas consumption is sufficient the degree of direct iron reduction must beclosely approximated to 0 and the run of blast furnace melting – to the ideal processof Gryunerovsky [2] without any additional solid fuel consumption in the blast-furnacehearth at high technological parameters of the process. Steam conversion of naturalgas improves the efficiency of its use in blast-furnace melting 1.5 times as much.Replacement ratio of blast-furnace coke by natural gas increases from 0.7 to 1.0 –1.05 kg / m 3 by expanding the amount of the reducing gases in comparison with thetraditional blowing of natural gas into the blast-furnace hearth. The use of secondaryenergy resources such as blast furnace gas for steam conversion improves theefficiency of natural gas with minimal consumption.References[1]. Производство первичного металла в странах западной Европы / Бабич А.И., Кочура В.В.,Формосо А., Гарсия Л. // Металл и литьё Украины. - 1997. - № 5. - С. 32 – 37.[2]. Ефименко Г.Г. Металлургия чугуна // Г.Г. Ефименко, А.А. Гиммельфарб, В.Е. Левченко. – К.:Высшая школа, 1988. – 351 с.579