| 摘要 |
A method and apparatus is disclosed for reducing entrainment of fines of feed stock material in tar- laden gases produced by a rotary kiln in the gasification of coal or other carbonaceous material. The fines and tar are both separated from the gas and from each other. The separated fines are recycled by admixing and churning such fines with newly provided solid carbonaceous feed material and recycled tar in a screw conveyor (8) prior to introduction of such mixture into the kiln (6). The mixing and churning action in the conveyor (8) causes the tar to coat particles of the newly provided feed material with tar and thereafter cause the fines to adhere to the tar-coated particles to form a composite agglomerate thereof. Such agglomerates when discharged into the kiln (6) by the conveyor (8), will travel a greater distance into the kiln (6) and away from the gas outlet (17) than the distance travelled by discrete fines. Fines adhering to the tar-coated particles as part of a composite agglomerate are, therefore, less likely to be carried out of the kiln by gas flow prior to gasification of such fines than are discrete fines. <IMAGE> |
