煤中有机硫形态结构和热解过程硫变迁特性的研究

CHARACTERIZATION OF ORGANIC SULFUR FORMS IN SOME CHINESE COALS BY HIGH PRESSURE TPR AND SULPHUR TRANSFER DURING HYDROPYROLYSIS

利用热解质谱并结合固定床热解反应装置，对煤中有机硫的形态结构及其对加氢热解过程硫变迁特性的影响，进行了较系统的研究。结果表明，煤中有机硫的形态结构在褐煤中主要以脂肪族、芳香族硫化物为主，而在烟煤中则主要以各种不同芳构化程度的噻吩结构为主，初步表明煤中有机硫形态结构随煤变质程度的变迁呈较强的连续递变性。煤热解过程中硫在各产物中的变迁和分布与煤中有机硫的形态结构特点密切相关。较高芳构化噻吩结构不完全的氢化还原反应显著制约了有机硫往气态产物中的转移，这使热解焦油中有机硫的分布量主要取决于原煤中具有较高芳构化程度的噻吩硫结构的含量，而与脂肪、芳香族硫化物甚至单环噻吩硫的含量关系不大。

The organic sulfur forms in some Chinese coals and their effect on sulfur transformation during coal hydropyrolysis were systematically characterized by high pressure TPR and in a fixed bed reactor Based on the H 2S evolution profiles of coals, the results indicated that the distribution of organic sulfur forms in coals progressively changes from aliphatic and aromatic sulfides and singlering thiophenes as the majority for lignites, to tworing or higher aromatic thiophenic structures for bituminous coal, i e the proportions of thiophenic sulfur structures and their aromaticity increase with an inerease in coal rank Different from what have been obtained, the amount of thiophenic sulfur in lignite is significant, but its majority is singlering thiophenic sulfur The sulfur transfer during coal hydropyrolysis is closely related to the distributions of organic sulfur forms The incomplete reduction of thiophenic structures, particularly those with more than two rings significantly decreases the sulfur transfer into H 2S, the extent of sulfur transfer into tar product is therefore markedly dependent on the amount of thiophenic structures of high aromaticity rather than on aliphatic and aromatic sulfides or singlering thiophenes