PROCESS FOR PRODUCING POWDERED COKE AND REACTIVE GRANULATED COKE

摘要

1486363 Coking bituminous coal HOUILLERES DU BASSIN DE LORRAINE 26 June 1975 [27 June 1974] 27147/75 Heading C5E In a coke manufacturing process in which bituminous coal is passed downwardly through an inclined rotating tubular oven 1 and the heat required for carbonization is provided by combustion of volatiles evolved from the coal, combustion air is introduced into the oven, at a position between the coke outlet and the zone at which the coke reaches maximum carbonization temperature, in an amount in excess of that necessary to bring the coke to the maximum carbonisation temperature, and an endothermic fluid such as water or flue gases is introduced into the oven in an amount sufficient to maintain the desired carbonization temperature; the supply of combustion air and endothermic fluid is regulated to ensure that the temperature of the gases issuing from the oven is kept above 600‹ C. and that the carbonization is carried out at 600-1100‹ C. The bituminous coal used has greater that 15% volatiles content and a swelling index between 1 and 8. In the apparatus shown, combustion air is fed via fan 9 and water via tube 11. Pyrometric devices 17 spaced along the oven are connected via control circuits to valves 18, 19 in the air and water intake lines. Further combustion air may be provided along the oven by fans 14, 15, 16. The coking process is controlled, either by adjustment of the speed of rotation of the oven or by providing a widened portion of the oven, to provide a zone of lowest temperature rise of 10-15‹ C. per minute in the temperature range 300-100‹ C.