摘要
综述了煤的热塑性、炼焦机理和焦炭质量预测的研究进展。煤的化学结构如煤中镜质组的烷基侧链和移动氢的含量决定了煤的热塑性,核磁共振、质子磁共振热分析、拉曼光谱和电子顺磁共振谱等从分子水平解释煤的热塑性、配合煤的相互作用和炼焦机理。塑性成焦机理认为,良好的氢传递和分子重排是炼焦中获得优质焦炭的重要条件,塑性成分在焦炭光学组织形成中非常关键,改变加热速率可使煤的光学组织形成机理改变。碱度指数(modified basicity index,MBI)、复合焦势(composite coking potential,CCP)和组合煤指数(combined coal index,CCI)等参数可精确地预测焦炭反应后强度和焦炭反应性。矿物质对焦炭强度的影响是研究热点,控制焦炭的裂纹和尺寸是未来焦炭质量的要求。
Coal thermoplasticity,coking mechanism and coke quality prediction are reviewed. Coal chemical structures control thermoplastic behavior of coal,such as alkyl side chains of vitrinite and mobile hydrogen content. HNMR,proton magnetic resonance thermal analysis,Raman and electron paramagnetic resonance spectroscopy provide valuable information for interpreting thermoplasticity, synergistic effects of coal blend and coking mechanism. Hydrogen transfer and molecular rearrangement are also important in the development of plasticity,and a plasticizing component is important for coke texture formation. It is also possible to pass from one mechanism to the other by changing heating rate during carbonization. Modified basicity index,composite coking potential and combined coal index of coal blend are correlated with coke strength after reaction and coke reactivity index. The effect of mineral matter on coke strength and reactivity are the focus of study. There is still much work to do in the control of fractures and coke size to guarantee coke quality.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2014年第5期1142-1150,共9页
Chemical Industry and Engineering Progress
基金
云南省教育厅科学研究基金项目(2010Y375)
关键词
热塑性
炼焦机理
焦炭质量预测
矿物质
thermoplastic
coking mechanism
coke quality prediction
mineralogy
