PURPOSE: To reduce the variation in the quality of coke by charging a semicoke contg. remaining volatiles under circling into a prechamber of a dry quenching apparatus to increase the proportion of large particles near the center of the prechamber.
CONSTITUTION: A coal charge is carbonized in a chamber oven to give a semicoke contg. 1-5% remaining volatiles derived from the coal charge. After pushed out of the oven at 600-900°C, the semicoke is charged under circling into a prechamber 10 of a dry quenching apparatus through a circling and charging apparatus 13 and a circling shoot 12, increasing the proportion of large particles near the center of the prechamber 10. Simultaneously, air is supplied under circling through an air supply apparatus 28, a duct 27, and the shoot 12 to the entire surface of the semicoke layer 30 to form a burning zone 31, burning a combustible gas comprising the remaining volatiles to heat and burn the semicoke uniformly in the radial and circumferential directions.
MAENO YUKIHIKO
HARAGUCHI HIROSHI
OKUHARA KATSUAKI
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