Preheating techniques to manufacture metallurgical coke.

概要

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Recently, reserves of good coking coals have become less available and comparatively more expensive. Resources are being extended by the use of coal blends with different coking properties and/or selective additive. Coal preheating technology emerged as a technique to overcome some of these problems. It has several advantages including: increases in coke oven productivity, improvements in quality of metallurgical coke, greater uniformity of charge, less air pollution by using a closed charging system, levelling of the charge, a saving in energy because dry coal is more efficient in the preheater than in a coke oven, and the possibility of using poorer and cheaper coking coals. The disadvantages of this technique are the handling of fine and hot coal, the carry-over and the preheater fines.Currently, the preheating process is being re-considered in combination with dry-cooling of coke in a European Research Project called "Jumbo Coking Reactor", which is based on past and current experience of development of modern cokemaking technology.This study reviews preheating technology as a means to widen the range of coking coals including not only the high-volatile coals which are more abundant, but also semi-anthracite and petroleum coke. A 6 t Experimental Coke Oven and a 2 t/h Preheating Pilot Plant (Precarbon Process) were used.
The Iron and Steel Institute of Japanの論文