文献类型：期刊文献

英文题名：Effect of temperature and hydrogen on product distribution and evolution of char structure during pyrolysis of bituminous coal in a drop tube furnace

作者：Gao, Rui[1];Dou, Benhao[1];Chang, Qinghua[1];Xu, Jianliang[1];Dai, Zhenghua[1];Yu, Guangsuo[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China

年份：2020

卷号：267

外文期刊名：FUEL

收录：;EI(收录号：20200508118094);WOS:【SCI-EXPANDED(收录号:WOS:000514171800045)】；

基金：The authors are grateful for the financial support from the National Key R&D Program of China, China (Grant 2018YFB0605000 and Grant 2018YFC0808500) and the National Natural Science Foundation of China, China (Grant No. 21776086 and Grant No. 21761132034).

语种：英文

外文关键词：Hydropyrolysis; DTF; Tar composition; Char structure evolution

摘要：This paper aims to investigate the hydropyrolysis behavior of pulverized bituminous coal in a drop-tube furnace (DTF) with a temperature of 800-1000 degrees C. The effects of temperature and hydrogen on the compositions (gases and tar) and the structure of products (char) were investigated. Hydropyrolysis between 800 and 1000 degrees C resulted in a high yield of methane, and tar production decreased with increasing temperature. Besides, the light components of tar, especially the naphthalene, were significantly increased with hydrogen. The methane yield firstly increased to a peak value of 72.83 ml/g(air-dried coal) at 900 degrees C and then decreased with increasing temperature during hydropyrolysis. Hydrogen significant improved the yield of gaseous hydrocarbon (C2H2, C2H4, and C2H6) when the temperature below 900 degrees C, while rarely change that at a higher temperature. At the temperature above 900 degrees C, the content of graphite in the hydropyrolysis char was lower than that of pyrolysis char in nitrogen. The graphite contents in the char decreased to a minimum at 950 degrees C and then gradually increased with increasing temperature. The char from hydropyrolysis has a higher condensation degree structure and higher saturation. The small aromatic molecules transformed into large aromatic molecules with increasing temperature under both pyrolysis and hydropyrolysis.