| 摘要 |
PURPOSE:A low-temperature carbonization device of indirect heating type to modify especially low-quality coal with high water content into coal with high calorie, by arranging a spiral heating tube at plural steps in a cylindrical container, feeding dried coal from the top and taking out carbonized coal from the bottom. CONSTITUTION:Coarsely powdered low-quality coal is dehydrated by a dryer, and the dried coal is fed from the top entrance of a carbonization device having the heating tube 8 wherein the spiral heating tube 8a is arranged at plural steps horizontally in a cylindrical container. The coal is usually carbonized at 250-450 deg.C while being lowered on the surface of the heating tube 8, and taken out from the bottom. EFFECT:Low-temperature carbonization can be continuously carried out by a compact carbonization device of movable layer type having no power, and economic modification is done.
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