文献类型：期刊文献

中文题名：Intrinsic kinetics and external diffusion of catalytic steam gasification of fine coal char particles under pressurized and fluidized conditions

作者：Xuantao Wu[1];Jie Wang[1]

机构：[1]Department of Chemical Engineering for Energy,Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education,East China University of Science and Technology,Shanghai 200237,China

年份：2019

卷号：13

期号：2

起止页码：415

中文期刊名：Frontiers of Chemical Science and Engineering

外文期刊名：化学科学与工程前沿（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2019_2020】；PubMed;

基金：the National Natural Science Foundation of China (Grand No.21376080).

语种：英文

中文关键词：coal;char;catalytic;steam;gasification;pressure;kinetics;diffusion

摘要：Catalytic steam gasification of fine coal char particles was carried out using a self-made laboratory reactor to determine the intrinsic kinetics and external diffusion under varying pressures (0.1-0.5 MPa) and superficial gas flow velocities (GF Vs) of 13.8- 68.8 cm· s^-1. In order to estimate the in-situ gas release rate at a low GFV, the transported effect of effluent gas on the temporal gasification rate pattern was simulated by the Fluent computation and verified experimentally. The external mass transfer coefficients(kmam) and the effectiveness factors were determined at lower GF Vs, based on the intrinsic gasification rate obtained at a high GFV of 55.0 cm·s^-1. The kmamwas found to be almost invariable in a wider carbon conversion of 0.2-0.7. The variations of kmam at a median carbon conversion with GFV, temperature and pressure were found to follow a modified Chilton-Colburn correlation:Sh=0.311Re^2.83Sc1/3(P/P0)^-2.07 (0.04