Experimental study on conversion path of sulfur in coal slime preheating combustion

作     者：Jiahang Zhang Jianguo Zhu Qinggang Lv Yi Zhang Jiahang Zhang;Jianguo Zhu;Qinggang Lv;Yi Zhang

作者机构：Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Waste Disposal and Sustainable Energy》 (废弃物处置与可持续能源（英文）)

年 卷 期：2022年第4卷第1期

页      面：63-68页

核心收录：

学科分类：0820[工学-石油与天然气工程] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：This study is supported by the high-efficiency and low-nitrogen combustion technology and demonstration of coal-fired industrial boilers(XDA20140100). 

主　　题：Preheating combustion Sulfur Conversation path Coal slime Experimental study 

摘      要：In this study,coal slime was mainly utilized to conduct experiments on a 30 kW preheating combustion test rig to analyze the conversion pathway of sulfur during the experiment,aiming at reducing slime pollution,controlling sulfur emission reasonably,and providing theoretical support for the preheating combustion technology.The results showed that after the coal slime was preheated,a large number of elements were released.The maximum release rates for H and S were 94.0%and 73.3%,respectively.The released S was converted into the sulfur-containing gases like H_(2)S,COS,CS_(2),and the rest existed in the solid in the five forms of mercaptan,thiophene,sulfoxide,sulfone,and sulfate.Besides,during the combustion process,the gas was oxidized continuously and finally converted into SO2,leaving only the sulfate in the fly ash.In the preheating combustion process,26.7%of the S was released from the coal,73.3%of the S was retained in the semi-coke,and the final SO2 emission concentration of combustion was 959 ppm.