煤溶胀影响因素及溶胀技术的应用

以煤溶胀机理、溶胀动力学等为基础,综述了溶剂性质、煤阶、氧化、温度、预处理、溶胀时间、水分、煤粉粒度等对煤溶胀的影响。结果发现:溶剂的供电子数目(EDN)、溶剂碱性、溶剂类型对煤的溶胀有不同的影响。煤阶对煤的溶胀影响较大,表现在随着C的增多,溶胀度也在增大,但当C含量大于85%时,溶胀度急剧降低。氧化煤易于溶胀。升高温度和预处理均有利于煤的溶胀。煤粉粒度越小溶胀度越好。脱除煤中的矿物质后有利于提高煤的溶胀度,但增加幅度不大。最后详细介绍了煤溶胀技术在研究煤分子结构、煤热解、煤液化方面的应用。 Based on the mechanism of coal swelling and its kinetics,the influence of properties of solvents,coal rank,oxidation,temperature,pretreatment,time of swelling,moisture and size of coal fines on coal swelling were reviewed in the paper.The results show that,electron donating number(EDN),alkalinity,types of dissolvant have different effects on coal swelling.Coal rank has pronounced influence on coal swelling.With the increasing of carbon number,the coal is apt to swell.However,when the carbon mass fraction is over 85 percent,the swelling ratio decreases sharply.Oxidized coal tends to swell.Small size,high temperature and pretreatment is favorable for swelling.Removing mineral also slightly improves swelling ratio.At last,the application of coal swelling technology in studying coal molecular structure,pyrolysis and coal liquefaction were emphasized