乙醇水蒸气重整制氢模拟研究

Simulation of steam reforming of ethanol for hydrogen production

利用Aspen Plus对乙醇水蒸气重整进行模拟,分析了影响乙醇水蒸气重整制氢反应的主要因素：压力、温度、水醇比。结果显示,压力升高,H2产率降低,CO2、CH4产率变化较小,其较理想反应压力为常压;温度升高,H2、CO产率增加,当温度为350℃-650℃时,H2的增长速率较快,而当温度达到650℃以上时,H2产率基本不变;水/醇的物质的量比增加,有利于乙醇转化,综合考虑能耗等因素其较优水醇比为7左右。在选定的反应条件650℃、0.1MPa、水/醇的物质的量比为7,CO2吸收塔板数18,塔顶压力0.6MPa,所得产品气可燃性气体物质的量分数为92.914%,其中H2为82.156%。

Steam reforming of ethanol was simulated by Aspen Plus, and the key factors （pressure, temperature and mole ratio of water to ethanol） which influenced the reforming of ethanol for hydrogen production were analyzed. Results revealed that the increase of pressure could lead a decrease of H2 yield while the yields of CO2 and CH4 were little affected; the increase of temperature could enhance the yields of H2 and CO, and the yield of H2 had a rapid increase from 350℃ to 650℃ and tended to be stable at temperature of over 650℃; and the increase of of water/ethanol mole ratio was in favor of the conversion of ethanol, and the appropriate mole ratio of water to ethanol was about 7 based on the comprehensive consideration of various factors including the energy consumption. Under the optimized reaction conditions of 650℃, 0.1MPa and water/ethanol mole ratio of 7, and CO2 absorption column tray number of 18 and top pressure of the column of 0.8MPa, the mole fraction of combustible gas in the product gas was 92.914%, among which H2 occupied 82.156%.