文献类型：期刊文献

英文题名：Particle Scale Study on Gasification of Char in Molten Salt Under Carbon Dioxide Atmosphere

作者：Chen, Qian[1]; Liu, Zhuoran[1]; Luo, Yi[1]; Xiang, Chong[1]; Wang, Xingjun[1]; Zhen, Haojie[1]; Yu, Guangsuo[1]; Chen, Xueli[1]; Liu, Haifeng[1]; Wang, Fuchen[1]

机构：[1] Shanghai Engineering Research Center of Coal Gasification, Institute of Clean Coal Technology, East China University of Science and Technology, P. O. Box 272, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230067370)

语种：英文

外文关键词：Carbon dioxide - Dissolution - Energy dispersive spectroscopy - Gasification - Ion beams - Morphology - Scanning electron microscopy - Shrinkage - Surface analysis

摘要：Gasification in molten salt provides a promising way for the direct carbon fuel cell. In this study, the interactions between char particles and molten salt, molten salt and coal ash during gasification in molten salt were investigated at the particle scale using visualization and surface analysis techniques. It was found that the gasification rate of char particles without molten salt coverage gradually slowed down due to the blockage of ash in the pore structure of char after a period of gasification reaction (the shrinkage rate was about 60%). At this time, the char particles covered by molten salt reacted rapidly, which accelerated the gasification rate and the conversion of char particles. It was reason that the molten salt dissolved the ash in the pores of the char particles and promoted the reaction. The char particles (the shrinkage rate was about 15%) could not react quickly after being covered by molten salt and they mainly went through the process of being covered, dissolved and broken by molten salt. In order to observe the morphology of char particles which covered by molten salt, the char particles were cut by Focused Ion Beam（FIB） combined with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. It was found that the traces of diffusion of gas products in the molten salt and the entrance of molten salt into the pore channels of char had a dissolving and pore-expanding effect on the char particles. Further analysis about the gasification reactivity of char particles was implemented by Raman analysis, found that dissolved char particles were more active than undissolved char particles and broken char particles were more active than unbroken char particles. ? 2023, The Authors. All rights reserved.