文献类型：期刊文献

英文题名：Morphological Evolution of a Single Char Particle with a Low Ash Fusion Temperature during the Whole Gasification Process

作者：Liu, Ming[1];Shen, Zhongjie[1];Liang, Qinfeng[1,2];Xu, Jianliang[1];Liu, Haifeng[1]

机构：[1]East China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Shanxi, Peoples R China

年份：2018

卷号：32

期号：2

起止页码：1550

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20180804822727);WOS:【SCI-EXPANDED(收录号:WOS:000426015000058)】；

基金：This study was supported by the National Natural Science Foundation of China (U1402272), the National Natural Science Foundation of China (21376082), and the Foundation of State Key Laboratory of Coal Conversion (Grant J16-17-301).

语种：英文

外文关键词：Shrinkage - Gasification - Energy dispersive spectroscopy - High resolution transmission electron microscopy - Scanning electron microscopy

摘要：The morphological evolution of a single char particle with a low ash fusion temperature (T-f) was investigated during the whole gasification process using a high-temperature stage microscope. The experimental results showed that the final shrinkage ratio of char particles at the temperature above Tf (1300 degrees C) was higher than that below the deformation temperature (1000 degrees C). The transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analysis results showed that the ash distribution in coal char was uniformly dispersed. Dispersed molten slag gradually aggregated to the molten slag layer during the gasification process at the temperature above T-f, and the slag layer evidently hindered the diffusion of the gasifying agent. Therefore, there was a critical shrinkage ratio during the gasification process when the temperature was above T-f and the critical shrinkage ratio of Xiaolongtan lignite (XLT) char particles was 0.7-0.8. The SEM energy-dispersive X-ray spectroscopy (EDS) analysis results indicated that the critical points in the curve of the shrinkage ratio with time were related to the molten slag on the char surface. In addition, the reaction mechanism in this experiment was analyzed. The calculating results indicated that the critical thickness of the molten slag layer of XLT and Shenfu bituminous (SF) coal chars with different ash contents showed good agreement and the critical thickness of the slag layer was 6-18 mu m. Finally, the sensitive analysis was performed to analyze the factors affecting the calculating results.