PURPOSE: To prevent deposition and growth of fused ash on oven wall and gasify coal efficiently, by cooling an upright throat connecting the oven bottom with the combustion chamber, and the oven bottom.
CONSTITUTION: Coal 1 and a gasifying agent 3 are fed into a coal gasifying oven 2 which is connected at the bottom with the top of a combustion chamber 7 by a throat 8. The coal is heated for reaction in a combustion zone 12 by heating gas blown up from the combustion chamber 7. Formed ash flocculate is discharged downwards through the throat 8 and the combustion chamber 7 and produced gas is taken out through a pipe 9. A cooling fluid 11 is blown into the throat 8 to cool the bottom of the fasifying oven 2 and the wall of the throat 8 and prevent deposition and growth of fused ash. The difference between surface temperatures of the throat 8 and a conical part 15 at the oven bottom and melting point of the ash should preferably be maintained at about 600°C or higher.
MOCHIZUKI TETSUROU
ENDOU SHIYUUJI
TANJI YASUNORI
