摘要
对比了二甲醚水蒸汽重整过程中由外部供热和燃烧反应尾气供热两种方式下的热效率,并对体系进行了热力学分析,模拟考察了反应温度、压力、原料组成等因素对体系平衡组成的影响,探讨了二甲醚转化率、氢气和一氧化碳等产物的变化情况。分析发现,反应器温度在200℃,压力为0.1MPa时可以获得最佳的原料转化率。研究认为二甲醚水蒸气重整制氢的副产物甲烷可显著降低氧气的含量,一氧化碳在高温、低水/二甲醚进料比的情况下产生。催化剂应具有选择性催化功能,同时应具有低温高活性。
Thermal efficiency of dimethyl ether steam reforming （DME SR） process that heat supplied by externally or by reformate combustion were compared. The thermodynamics of hydrogen production from dimethyl ether steam reforming was calculated to study the influences of reaction temperature, pressure, feed composition on equilibrium composition. DME conversion, hydrogen and carbon monoxide selectivity were analyzed. A high conversion can be obtained at 200℃ and 0.1 MPa. It was found that the hydrogen yield would be drastically decreased by the production of methane, which was more thermodynamic favored. Carbon monoxide would be favored at high temperature and low steam-DME ratio, and selective catalysts are necessary to obtain a high activity at a low temperature.
出处
《化学反应工程与工艺》
EI
CAS
CSCD
北大核心
2007年第5期409-415,共7页
Chemical Reaction Engineering and Technology
关键词
二甲醚
水蒸汽重整
燃料电池
氢
热效率
dimethyl ether
steam reforming
fuel cells
hydrogen
thermal efficiency
