ZHANG Jiahang, ZHU Jianguo, ZHANG Yi

(1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China; 2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: In order to control sulfur emissions from coal burning, preheating combustion experiments of pulverized coal as well as sampling and analysis were carried out. The conversion characteristics of sulfur during coal preheating combustion were studied by gas chromatograph, gas analyzer and X-ray photoelectron spectroscopy. The results show that there are six kinds of solid sulfur in Shenmu bituminous coal: pyrite, thiophene, sulfoxide, sulfone, sulfonate and sulfate. After preheating, 40.5% of sulfur in pulverized coal still exists in semi-coke in the form of six kinds of solid sulfur, and 59.5% is converted to sulfur-containing gas. Compared with raw materials, the mass fractions of pyrite, thiophene, sulfonate and sulfate in semi-coke decreased, while the mass fractions of sulfoxide and sulfone increased. In the reduction zone of combustion process, when the temperature reaches 1 100 ℃, a large amount of solid sulfur decomposes. Thiophene, sulfoxide, sulfoxide and sulfonates decompose rapidly to H2S and COS due to the increase of oxidants in the burnout zone. In the burnout zone, only sulfonate and sulfate are left, and the mass concentration of SO2 in the tail flue gas is only 209 mg/m3.

Keywords: pulverized coal; preheating combustion; sulfur; conversion characteristics

中图分类号： TQ534

文献标志码：A

文章编号：1008-5548(2021)04-0045-09

DOI:10.13732/j.issn.1008-5548.2021.04.006

收稿日期： 2020-12-10， 修回日期：2021-03-10，在线出版时间：2021-06-03 11:24。

基金项目：中国科学院战略先导科技专项项目，编号：XDA21040100。

第一作者简介：张嘉航(1996—)，女，硕士研究生，研究方向为预热燃烧技术。E-mail： zhangjiahang@iet.cn。

通信作者简介：朱建国(1977—)，男，研究员，硕士生导师，研究方向为预热燃烧技术。E-mail： zhujianguo@iet.cn。