文献类型：期刊文献

英文题名：Enhanced slurryability and rheological behaviors of two low-rank coals by thermal and hydrothermal pretreatments

作者：Fu, Jianmin[1];Wang, Jie[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Dept Chem Engn Energy, Shanghai 200237, Peoples R China

年份：2014

卷号：266

起止页码：183

外文期刊名：POWDER TECHNOLOGY

收录：;EI(收录号：20142817937265);WOS:【SCI-EXPANDED(收录号:WOS:000341221800021)】；

基金：This work is funded by the National "863" Scientific Research Program (2011AA05A201) and the National Program on Key Basic Research Project (973 Program, Grant No. 2010CB227005-03). The authors express thanks to Professor Yifei Wang, Ms. Xia Liu, and students Huihui Zhai, Jie Zhang and Yutao Shen at the Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education for their assistance in experiments.

语种：英文

外文关键词：Coal water slurry; Low-rank coal; Char; Hydrothermal treatment; Pyrolysis

摘要：The aim of this work is to study the slurryability of two low-rank coals (a Chinese YX lignite and a Chinese ZD subbituminous coal) and various upgraded coals or chars obtained by thermal and hydrothermal treatments. Thermal treatment was conducted in an air-isolated atmosphere at temperatures from 145 degrees C to 700 degrees C Hydrothermal treatment of coal was carried out in an autoclave at temperatures from 150 degrees C to 300 degrees C with autogenous pressure from 0.8 MPa to 92 MPa. The two raw coals exhibited the poor slurryability, and a significant enhancement in the slurryability was achieved by both the thermal and hydrothermal treatments depending on the conditions. A coal or char slurry (CWS) with the solid loading of 59 wt.% was prepared from the YX lignite by the thermal treatment at 400 degrees C, which had the apparent viscosity of 1208 mPa sand the good stability. The apparent viscosity of CWS was found to be related to but not limited to the elimination of hydrophilic groups by pretreatment. The hydrothermal treatment was more effective to decompose the hydrophilic groups than the thermal treatment for YX lignite, while this was not the case for ZD coal. The enrichment of carboxyl-bound calcium in ZD coal enabled the hydrophilic groups to be more thermally refractory, and this calcium-combining structure appeared to have a negative effect on the slurryability and the dispersion stability. The CWSs prepared from the thermally treated YX coals or chars were less pseudoplastic and less easily subjected to a pseudoplastic change with increasing solid loading than those from the parent coal. (C) 2014 Elsevier B.V. All rights reserved.