文献类型：期刊文献

英文题名：Effect of experimental variables on coal catalytic hydrogasification in a pressurized fluidized bed

作者：Yan, Shuai[1];Qu, Xuan[2];Xia, Zihong[1];Chen, Caixia[1];Bi, Jicheng[2]

机构：[1]East China Univ Sci & Technol, Dept Energy & Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China

年份：2022

卷号：307

外文期刊名：FUEL

收录：;EI(收录号：20213510838189);WOS:【SCI-EXPANDED(收录号:WOS:000702763200004)】；

基金：The authors gratefully acknowledge financial support from the NSFC-Xinjiang joint fund (U1703253), the National Natural Science Foundation of China (21908062), and the State Key Laboratory of Coal Conversion (Grant No. J19-20-202).

语种：英文

外文关键词：Coal gasification; Catalytic hydrogasification; Methane; Liquid hydrocarbons; Pressurized fluidized bed

摘要：Catalytic hydrogasification of pulverized coal was performed using a pressurized fluidized bed to investigate the effect of experimental variables including catalyst additives, temperature (600-850 degrees C) and hydrogen (H-2) pressure (0.6-3.0 MPa) on the catalytic behavior of cobalt (Co) and formation profiles of target products, i.e., methane (CH4) and liquid hydrocarbons (HCL). The experimental results suggest that calcium (Ca) as an additive demonstrated a superior promoting effect on Co by mediating the Co-coal interaction, which initiated the catalytic depolymerization and hydrogenation of unreactive carbon. The temperature above 750 degrees C stimulated the diffusion of Co-Ca catalyst in the coal structure, and enhanced the coal catalytic hydrogasification by lowering the activation energy. However, the elevated temperature decreased the HCL yield due to the intensified hydrocracking. The elevation of H-2 pressure strengthened the Co-Ca-Coal-H-2 interaction, which conduced to the depolymerization and hydrogenation effect of Co-Ca catalyst, and improved the yield of CH4 and HCL. Based on the experimental results, a two-stage pressurized fluidized bed reactor scheme was proposed to couple the coal catalytic hydropyrolysis with char catalytic hydrogasification. Staged hydrogenation of coal was realized, and a yield of 74.2 wt% for gaseous hydrocarbons (CH4 and C-2-C-3) and 3.36 wt% of HCL (BTX, PCX, and naphthalene) were obtained.