Coking performance of extracts from degradative solvent extraction of low-rank coals for coal blending and coke making
At present,the use of binder additives for coal blending to reduce the proportion of coking/fat coal is an important way to decrease the cost and enhance the efficiency of the coking industry.Domestic and international studies have already demonstrated the feasibility of the substitution of coking/fat coal for coking by extracts from degradative solvent extraction of low-rank coals in the laboratory,but there has been no actual coking validation on a large scale.Accordingly,This paper built a low-rank coal degradative solvent extraction device and cooperated with several coking plants to complete the experimental validation of extracts replacing coking/fat coal in small coke ovens.The results showed that the extracts could significantly reduce the ash content of coke and maintain the coking performances of coke basically unchanged when replacing 20%of fat coal or 10%of coking coal.Moreover,the extract had a 72%—77%retention rate in the coke,which did not result in a significant reduction in coke yield.Therefore,this study clarified the feasibility of the extracts from degradative solvent extraction of low-rank coal to replace coking/fat coal,provided a new option for cost reduction and efficiency increase in the coking industry,and further promoted the progress of industrialization of the degradative solvent extraction of low-rank coal technology.
万方数据
维普
