Process for the production of pig iron in a blast-furnace operated with oxygen and recycled, from the liberated CO2, with the addition of hydrocarbons

摘要

The invention relates to a process for the production of pig iron in a blast furnace, in which a reducing gas is used as a substitute reducing agent, which is generated from recirculated, liberated from CO¶2¶ blast furnace gas with the addition of highly reactive hydrocarbons and oxygen and (CO¶2¶ + H¶2 ¶O) contents which are limited to 15% by volume, preferably 10% by volume. The reducing gas is fed into the high-temperature zone in the frame and / or in the latch or in the lower shaft. DOLLAR A The invention has for its object to provide a method for pig iron production in the blast furnace with simultaneous recycling of CO gas and H¶2¶-rich reducing gas produced completely or partially from top gas in the blast furnace, wherein the reducing gas to the necessary temperatures of up to 1400 ° C., preferably 800 to 1000 ° C., the (CO 2 2+ + H 2 SO 2) content of the reducing gas being reduced to 15% by volume, preferably to 10% by volume , is limited. The limitation of the (CO¶2¶ + H¶2¶O) content is necessary in order to perform the required reduction work in the blast furnace while reducing the coke consumption. DOLLAR A The object is achieved in that the blast furnace leaving the blast furnace CO¶2¶ removal is subjected to a representative of the prior art adsorptive or absorptive process and this CO¶2¶-poor blast furnace gas together with oxygen and a highly reactive Hydrocarbon of ...