HU Fating;WANG Xueyun;MAO Xuefeng;LI Junfang;ZHAO Peng;

• 1:Coal Chemistry Branch of China Coal Research Institute
• 2:State Key Laboratory of Coal Mining and Clean Utilization
• 3:National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control

Abstract：

Direct coal liquefaction technology is an important way to promote the clean and efficient utilization of coal,alleviate the contradiction between oil supply and demand,and ensure the energy security in China.In order to fully understand the whole process of coal liquefaction reaction mechanism,kinetics,catalyst and technology,and promote the rapid progress of basic research of coal direct liquefaction technology and the development of new technology,the research results of the mechanism,reaction kinetics,catalyst and liquefaction process of the hydrogenation liquefaction were introduced. In this paper,the coal liquefaction processes of German IGOR,Japan NEDOL and Shenhua in China were mainly introduced,and the development history and characteristics of these typical coal liquefaction processes were analyzed.The development trend of direct coal liquefaction to oil technology were pointed out.The hydrogenation liquefaction reaction of the coal is a free radical reaction mechanism,which is a comprehensive result of a series of sequential reactions and parallel reactions,and includes pyrolysis of coal,hydrogenation of free radicals,removal of impurity atoms and condensation reaction,etc.In general,the sequential reaction is dominant.With the help of modern analytical methods and experimental methods such as isotope tracing,in situ detection,plasma and microwave rapid heating,the research on the production rate of free radicals,the active hydrogen production rate and the quantitative transfer mechanism of free radical is helpful to further understand and accurately elucidate the mechanism of coal hydrogenation and liquefaction.Using different research methods,the various kinetic models for different coal types,catalysts,process conditions and hydrogen supply solvents have been established in various countries. The kinetic models range from single-component to two-component and multi-component,from continuous reaction,parallel reaction to complex network reaction,from the initial one-step reaction to the later more reasonable multi-stage reaction. The models are becoming more and more complex and closer to industrial applications. The multi-component " lumped" reaction kinetic model based on the different stages of the reaction will be the main direction for the development of coal hydrolique reaction kinetics in the future.By means of the advanced analysis means and the treatment method,it is the development trend in the future to establish the model of the coal liquefaction dynamics law under different conditions.With the help of hightech such as nano-synthesis and plasma,it is an effective method for the preparation of highly active catalysts by controlling the compatibility of components,reducing the particle size of catalyst and optimizing the preparation method. The future development trend of direct coal liquefaction is to strengthen the rational configuration and optimization integration of the system,pay attention to the mild liquefaction and classification transformation of coal,optimize the product structure,and develop the coupling technology of direct and indirect liquefaction.

Key Words： direct coal liquefaction;reaction mechanism;reaction kinetics;catalysts;technological process

Abstract:

Keywords:

Foundation: 国家重点研发计划资助项目(2016YFB0600303)

Authors: HU Fating;WANG Xueyun;MAO Xuefeng;LI Junfang;ZHAO Peng;

DOI: 10.13226/j.issn.1006-6772.19121601

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