Thermodynamic analysis of autothermal steam and CO2 reforming of methane
Thermodynamic analysis of autothermal steam and CO2 reforming of methane
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DOI：
10.1016/j.ijhydene.2008.02.051
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发表时间：
2008-05-01
影响因子：
7.2
通讯作者：
Mi, Zhentao
中科院分区：
文献类型：
--
作者：
Li, Yunhua;Wang, Yaquan;Mi, Zhentao
采用Gibbs自由最小化法研究了甲烷、H2O或CO2转化率、H2产率和结焦与H2O/CH4、CO2/CH4、O2/CH4、重整温度和压力之间的热力学平衡。给出了重整的最佳反应条件和消除焦炭的途径。结果表明，在相同的反应条件下，CO2重整比水蒸气重整更容易生成焦炭。应通过提高CO2重整反应温度和增加蒸汽重整进料的水蒸气含量来实现除焦。通过对CO2氧化重整反应的热力学平衡分析，得出最佳的CH4/CO2/O2进料比为1：0.8~1.0：0.1~0.2，反应温度高于800℃时，积炭随压力的升高而增加，而高温对此有抑制作用。(C)2008年国际氢能协会。爱思唯尔有限公司出版。保留所有权利。
Thermodynamic equilibrium of methane autothermal reforming was studied by Gibbs free minimization for methane and H2O or CO2 conversions, H-2 yield and coke deposition as a function of H2O-to-CH4 ratio, CO2-to-CH4 ratio, O-2-to-CH4 ratio, reforming temperature and pressure. The optimal reaction conditions for reforming and the ways for coke elimination were given. The results showed that coke formed in CO2 reforming was easier than that formed in steam reforming under similar conditions. Coke elimination should be done by increasing the reaction temperatures in CO2 reforming while by increasing steam content fed in steam reforming. The optimal CH4/CO2/O-2 feed ratios 1:0.8-1.0:0.1-0.2 through the analysis of thermodynamic equilibrium in the oxidative CO2 reforming were corresponding to the reaction temperature higher than 800 degrees C. Carbon deposition increased with the increase in pressures while a high temperature can suppress this effect. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.