文献类型：期刊文献

英文题名：Influences of Ash-Existing Environments and Coal Structures on CO2 Gasification Characteristics of Tri-High Coal

作者：Liu, Lang Jiao, Qingrui Yang, Jian Kong, Bowen Ren, Shan Liu, Qingcai

第一作者：刘浪

通信作者：Liu, L[1]

机构：[1]Guizhou Inst Technol, Chem Engn Inst, Guiyang 550003, Peoples R China;[2]Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Chem Engn Inst, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2020

卷号：8

期号：11

起止页码：1-11

外文期刊名：PROCESSES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000593743900001)】；

基金：This study was supported by the Science and Technology Planning Project of Guizhou province (Qiankehejichu [2018]1066), Young Teachers Training Project of Guizhou Institute of Technology ([2017]5789-05), Guizhou Science and Technology Support Project (Contract no: Qiankehe Zhicheng [2019]2872) and the Research Start-up Funding Project for High-level Talents of Guizhou Institute of Technology.

语种：英文

外文关键词：ash-free coal; CO2 gasification; coal structure; tri-high coal

摘要：Two kinds of tri-high coals were selected to determine the influences of ash-existing environments and coal structures on CO2 gasification characteristics. The TGA results showed that the gasification of ash-free coal (AFC) chars was more efficient than that of corresponding raw coal (RC) chars. To uncover the reasons, the structures of RCs and AFCs, and their char samples prepared at elevated temperatures were investigated with SEM, BET, XRD, Raman and FTIR. The BET, SEM and XRD results showed that the Ash/mineral matter is associated with coal, carbon forms the main structural framework and mineral matters are found embedded in the coal structure in the low-rank tri-high coal. The Raman and FTIR results show that the ash can hinder volatile matters from exposing to the coal particles. Those results indicate that the surface of AFC chars has more free active carbon sites than raw coal chars, which are favorable for mass transfer between C and CO2, thereby improving reactivity of the AFC chars. However, the gasification reactivity was dominated by pore structure at elevated gasification temperatures, even though the microcrystalline structure, functional group structure, and increase in the disorder carbon were improved by acid pickling.