低阶煤溶剂萃取技术研究进展OA

The low-rank coal resources in China are very rich,accounting for 57.38%of the total predictive reserves of the country's coal resources.The low-rank coal has the characteristics of high ash,high water,poor cohesiveness,and low calorific value.It is difficult to be directly used for coking,coal liquefaction and gasification,causing waste of resources.Base on the principle of similar compatibility,the carbon skeleton structure of the low-rank coal can be broken by the solvent extraction process to prepare the modified coal,which has the characteristics of ashless,high coking property and high calorific value.Therefore,the possibility for high value utilization of low rank coal can be provided by this method.This paper introduces the extraction efficiency of pulverized coal by different solvent types such as polar solvent,nonpolar solvent,mixed solvent and biomass,and summarizes the influence mechanism of dif-ferent reaction conditions such as alkali pretreatment,temperature,initial pressure,pulverized coal particle size and pulverized coal properties on the extraction efficiency of pulverized coal.In the future,we should strengthen the research on extraction of low-rank coal by combined extraction method,screen out more biomass suitable for extrac-tion of low-rank coal by orthogonal test,and consider the influence of reaction conditions and pulverized coal properties on extraction of low-rank coal comprehensively.