| 摘要 |
PROBLEM TO BE SOLVED: To surely suppress thermal decomposition of coal, when coal is preheated at elevated temperature in the coal-preheating step. SOLUTION: Before coal is charged in a coke furnace for producing metallurgical coke, the coal is preheated by heat exchange with the hot gas. In this preheating, the coal is preheated until the coal reaches in the temperature ranges from 200 deg.C to 300 deg.C so that the coal is perfectly dried in the first step. Then, without the cooling step the dried coal is led to the solid-gas separator and separated from the hot gas and directly introduced into the coal preheater and further heated over 300 deg.C, preferably at 340-430 deg.C.
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