文献类型：期刊文献

英文题名：Conversion characteristics of a single coal char particle with high porosity moving in a hot O2/CO2 atmosphere

作者：Xue, Zhicun[1];Gong, Yan[1];Guo, Qinghua[1];Wang, Yifei[1];Yu, Guangsuo[1,2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High Efficiency Coal Utilizat & Gre, Ningxia 750021, Peoples R China

年份：2019

卷号：256

外文期刊名：FUEL

收录：;EI(收录号：20193307304362);WOS:【SCI-EXPANDED(收录号:WOS:000482184800022)】；

基金：This work has been supported by the National Key R&D Program of China (2017YFB0602601) and the National Natural Science Foundation of China (21676091, 21761132034).

语种：英文

外文关键词：Coal char particle; High porosity; Particle structure; O-2/CO2 atmosphere; Stefan flow

摘要：The conversion characteristics of a single particle with high porosity moving in a high temperature O-2/CO2 atmosphere were simulated to complement the particle conversion sub-model. Considering the significant changes in the pore structure of high porosity particles, the effects of the high porosity (0.5-0.9) on conversion process were investigated. According to the experimental studies, two different types of char structures were considered for the particles with different porosity to establish the particle structure model, which include large pore structure and cenosphere structure. The reaction model contains water-gas-shift reaction, CO oxidation reaction and four heterogeneous reactions. The results show that the diffusion of the species is less limited inside the particle when the particle porosity is higher than 0.8. With the increase of particle size, the surface temperature and temperature gradient decrease. With the increase of the particle porosity, the surface temperature decreases and the temperature gradient increases. In addition, the specific carbon consumption rates decrease along with the increase of the particle size. When the particle porosity increases, the specific carbon consumption rates decrease firstly then significantly increase.