State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing

我国煤炭资源相对丰富,但炼焦煤资源所占比仅18.9%,气煤和1/3焦煤在炼焦煤查明资源储量中约占47%,而优质炼焦煤占比不到10%。许多钢铁企业为了生产更高品质的焦炭而配入过多优质炼焦煤,这为优质炼焦煤资源和高品质焦炭的持续供应带来极大困难。基于快速加热的预处理技术在拓展和节约使用优质炼焦煤资源,保证炼焦高产、优产,降低成本和提高焦炭品质等方面意义重大。综述了利用预热处理改善炼焦煤性质的研究,重点讨论了快速预热改善炼焦煤黏结性的影响规律。研究表明,炼焦煤在进行预热处理时,煤种、预热终温及升温速度等因素均会显著影响焦煤炭化过程中的结构演化。在热处理过程中,随热处理温度升高,煤的芳香结构不断发展,石墨化程度加深。快速预热一方面抑制了煤的热分解,另一方面使煤的大分子结构松弛,导致煤分子在热塑性阶段移动性增强,从而提高了煤黏结性。最后总结了快速预热技术在机理研究以及工业应用等方面存在不足。

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.

国家自然科学基金资助项目(U1960205)

薛庆国,乔子棽,张林杨,等.预热处理改善炼焦煤性质的研究进展[J].洁净煤技术,2023,29(12):65-74.

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.