煤液化残渣中硫的迁移和转化研究现状及展望

Research progress and prospect of sulfur migration and transformation in coal liquefaction residue

为了解煤液化残渣利用过程中,硫化物迁移和转化规律,介绍了煤液化残渣中硫的来源及分布,总结了煤液化残渣在加氢液化、气化制氢、热解、燃烧等过程中硫化物的迁移和转化过程及影响因素,并对煤液化残渣中硫的迁移和转化的研究前景进行展望。结果表明,无机硫逐渐向有机硫转化,H2S是转化过程中的重要介质;H_2S、CS_2、SO_2等气态硫化物是煤液化残渣利用过程中的主要气态副产物;部分硫化物转化为大分子有机硫进入二次产品,影响产品质量和使用效果。为了合理有效地利用煤液化残渣,需寻找残渣中无机硫转化为单质硫或大分子有机硫的新方法,循环利用气体硫化物,开发新型煤液化催化剂,减少单质硫助剂使用量。

Based on the research status of sulfide migration and transformation in coal liquefaction residue, the origin and distribution of sulfur in coal liquefaction residue were introduced. The migration and transformation process of sulfide in coal liquefaction residue during hydrogenation, gasification, pyrolysis and combustion were summarized. The influencing factors of sulfur conversion were described, and the development prospect of sulfur migration and transformation in coal liquefaction residue was forecasted. The results show that sulfur in inor- ganic minerals is gradually eonvertes to organic sulfur, and H2S is the important medium in the conversion process. The gaseous sulfides, such as H2S, CS2 and SO2, are the main gaseous by-products during the conversion of coal liquefaction residue. Part of the sulfide is con- verted to macromolecular organic sulfur as the secondary product, affecting the quality and use of products. In order to rationally and effec- tively utilize the coal liquefaction residue, it is necessary to develop new approaches for converting inorganic sulfur into elemental sulfur or macromolecule organic sulfur. The recycling of gas sulfide and development of new coal liquefaction catalyst with less elemental sulfur ad- ditive are feasible.