Process of producing reducing gas from solid fuels

Details Process of producing reducing gas from solid fuels Process of producing reducing gas from solid fuels

C - Chemistry, Metallurgy

10

J

39/1, 48/28

C10J 3/00 (2006.01) C10J 3/02 (2006.01) C21B 13/00 (2006.01)

Patent

CA 1146754

ABSTRACT OF THE DISCLOSURE: The invention is concerned with a process for the pro- duction of reducing gas from solid fuels, in which a reducing gas which consists in at least 80% by volume of the components hydrogen and carbon monoxide and is intended for use in the reduction of ores is produced by the gasification of solid granular fuels in a fixed bed by a treatment with oxygen and steam under a pressure in the range of 5 to 50 bars. The process of the invention is characterized in that the gas produced by the gasification is subjected to shift conversion in order to reduce its residual car- bon monoxide content to about 1 to 10 by volume of dry gas, the shift-converted gas is scrubbed to remove the sulfur compounds and to reduce its CO2 content to 3% by volume, at most, and to provide a scrubbed gas which consists in more than 70% by volume of hydro- gen and carbon monoxide and contains more than 10% by volume of methane, the scrubbed gas is mixed with a reduction process exhaust gas formed by the reduction of ores, the mixed gases are reformed under a pressure of 1.5 to 10 bars and at temperatures of 800 to 1500 °C, and at least partly reformed gas, which contains up to 3% by volume of CO2 and up to 5% by volume of methane and is at temperatures of about 700 to 1000 °C, is fed to an ore-reducing plant as reducing gas. In the process of the invention, the CO2 of the gas produced by the gasification of fuel is shift-converted to such a degree that it is not necessary to remove CO2 from the reduction process exhaust gas formed by the reduction of ores.

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