中文摘要：

针对车载二甲醚水蒸气重整制氢反应体系,分析了重整体系的热力学效率;计算了体系中主要反应的化学平衡常数随温度的变化关系;确立了反应体系的独立方程并进行了热力学平衡计算,研究了水醚比、温度、压力等对平衡的影响。结果表明：重整气比二甲醚最高可增加15.45%的低热值;二甲醚在温度大于473 K、水醚比大于2时具有很高的转化率,平衡浓度接近于零;重整气中主要成分是H2、CO和CO2,其中H2含量最高,最大浓度为72%;二甲醚中碳元素在高温、低水醚比时主要生成CO,在低温、高水醚比时主要生成CO2;压力对反应平衡浓度影响很小。

英文摘要：

For hydrogen production in vehicle dimethyl ether（DME） steam reforming reaction system,the thermodynamic efficiency of reforming reaction system was analyzed.The change of chemical equilibrium constant in main reactions with temperature was confirmed.The effects of steam-to-DME ratio,temperature and pressure on equilibrium were studied.The results indicated that DME-reformed gas increased low heat value by 15.45%.DME had a high conversion when the temperature was higher than 473 K and steam-to-DME ratio was more than 2,and the equilibrium concentration was close to zero.The main components of reformed gas were H2,CO and CO2.The content of H2 showed the most,and the largest concentration was 72%.With high temperature and low steam-to-DME,carbon in DME would be converted to CO.With low temperature and high steam-to-DME,carbon in DME would be converted to CO2.Pressure had little effect on the reaction equilibrium concentration.