China is relatively rich in coal resources, but the proportion of coking coal resource is only 18.9%. Gas coal and 1/ 3 coking coal account for 47% in the identified resource reserves of coking coal, while high-quality coking coal accounts for less than 10%.Inorder to produce higher quality coke, many iron and steel enterprises add too much high quality coking coal, which brings great difficultiesto the continuous supply of high quality coking coal resources and high quality coke. Rapid heating pretreatment technology is of great significance in expanding and saving the use of high quality coking coal resources, ensuring high and excellent coking production, reducing cost and improving coke quality. The improvement of coking coal properties by preheating treatment was reviewed. The focus is on theinfluence law of rapid preheating to improve coking coal adhesion. The results show that factors such as coal type, preheating temperature,and heating rate have a significant impact on its structural evolution during carbonization after preheating. During heat treatment, the aromatic structure of coal continuously develops, and graphitization increases. On the one hand, rapid preheating inhibits the thermal decomposition of coal, on the other hand, it relaxes the macromolecular structure of coal, which leads to enhance its fluidity during thermoplasticstage, improving its caking property. The shortcomings of rapid preheating technology in terms of mechanism research as well as industrialapplications were summarized.

薛庆国(1966—),男,北京人,教授,博士。E-mail:xueqingguo@ustb.edu.cn

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XUE Qingguo,QIAO Zishen,ZHANG Linyang,et al.Research progress on the effect of preheating on coking coal properties[J].Clean Coal Technology,2023,29(12):65-74.