COMBUSTION OF POWDERED COAL OF DOWNWARDDVENTILATING TYPE CUPOLA BY PURE OXYGEN

摘要

PURPOSE:To obtain a nitrogen-free water gas at low cost without the danger of explosion by the procedure in which a pure oxygen blowing pipe and powdered coal injector on the upside of a coke-packed layer are separated from each other and surrounded by water vapor, CO2, etc., and then combustion is performed. CONSTITUTION:The lower wall of a lidded cupola furnace is provided with a flue inlet of a sectional area wider than that of the furnace and then coke is packed from the furnace bottom to the lower part of the up-stage tuyere. In such a downward-ventilating type cupola, a pure oxygen blowing pipe and a powdered coal injector are separated from each other and surrounded by water vapor, CO2, etc., and then combustion is performed. Thus, a furnace temperature reversing phenomenon in which the temperature (approx. 1600 deg.C) of the furnace lower part becomes higher than the temperature (approx. =1200 deg.C) at the tuyere portion by the combustion heat in the charging portion of upper part of the coke-packed layer is brought about, whereby CO2 and H2O as the main components of combustion gas are converted into water gas (CO and H2) and also water vapor and CO2 surrounding the pure oxygen blowing pipe and the powdered coal injector are converted into water gas likewise.