Abstract
Oven charging is an important operation stage in coke making process which is also where most of the coal dust is commonly generated. Coal dust is seen as a major hazard due to its tendency to ignite explosively causing coal losses, environmental pollution and plant equipment damages. In this study, the effect of recycling coke oven tar addition over a loading range of 2– 8 wt.% was evaluated as a probable partial substitute for expensive coking coals. Operation under an optimum coke oven tar loading of 6 wt.% resulted in a remarkable reduction of coal fines of 56.8%. By reducing coal fines, there is a considerable reduction in coal dust that personnel are exposed to and a reduction in acid mine drainage when storing the discarded coal fines as well as a decreased likelihood of spontaneous combustion. In addition, coal dust can cause pneumoconiosis and other health related conditions. Good coke qualities compared well to other international benchmarks were obtained. Vital factors for coking pressure such as maximum dilatation and maximum contraction increased within the acceptable range of <30 and < 20 respectively. High coking pressures cause operational problems such as stickers and heavy-pushes, which result in the deterioration of the brick lining of the coke oven walls. Therefore, it is desirable that coke oven tar increase coking pressure within the acceptable range so that the life span of the coke ovens is not shortened.
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