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首页> 外文期刊>Journal of power sources >Thermodynamic evaluation of methanol steam reforming for hydrogen production
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Thermodynamic evaluation of methanol steam reforming for hydrogen production

机译：甲醇蒸汽重整制氢的热力学评估

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Thermodynamic equilibrium of methanol steam reforming (MeOH SR) was studied by Gibbs free minimization for hydrogen production as a function of steam-to-carbon ratio (S/C = 0-10), reforming temperature (25-1000℃), pressure (0.5-3 atm), and product species. The chemical species considered were methanol, water, hydrogen, carbon dioxide, carbon monoxide, carbon (graphite), methane, ethane, propane, i-butane, n-butane, ethanol, propanol, i-butanol, n-butanol, and dimethyl ether (DME). Coke-formed and coke-free regions were also determined as a function of S/C ratio. Based upon a compound basis set MeOH, CO_2, CO, H_2 and H_2O, complete conversion of MeOH was attained at S/C = 1 when the temperature was higher than 200 ℃ at atmospheric pressure. The concentration and yield of hydrogen could be achieved at almost 75% on a dry basis and 100%, respectively. From the reforming efficiency, the operating condition was optimized for the temperature range of 100-225℃, S/C range of 1.5-3, and pressure at 1 atm. The calculation indicated that the reforming condition required from sufficient CO concentration ( < 10 ppm) for polymer electrolyte fuel cell application is too severe for the existing catalysts (T_r = 50℃ and S/C = 4-5). Only methane and coke thermodynamically coexist with H_2O, H_2, CO, and CO_2, while C_2H_6, C_3H_8, i-C_4H_(10), n-C_4H_(10), CH_3OH, C_2H_5OH, C_3H_7OH, i-C_4H_9OH, n-C_4H_9OH, and C_2H_6O were suppressed at essentially zero. The temperatures for coke-free region decreased with increase in S/C ratios. The impact of pressure was negligible upon the complete conversion of MeOH.
机译：通过吉布斯自由最小化研究了制氢过程中甲醇蒸汽重整（MeOH SR）的热力学平衡，它是蒸汽/碳比（S / C = 0-10），重整温度（25-1000℃），压力（ 0.5-3 atm）和产品种类。所考虑的化学物质是甲醇，水，氢气，二氧化碳，一氧化碳，碳（石墨），甲烷，乙烷，丙烷，异丁烷，正丁烷，乙醇，丙醇，异丁醇，正丁醇和二甲基醚（DME）。还确定了焦炭形成区域和无焦炭区域作为S / C比的函数。以甲醇，CO_2，CO，H_2和H_2O的化合物为基准，当温度在大气压下高于200℃时，在S / C = 1时可以实现MeOH的完全转化。氢气的浓度和产率分别以干基计为75％和100％。从重整效率出发，针对温度范围为100-225℃，S / C范围为1.5-3和压力为1 atm的条件优化了操作条件。计算表明，对于现有的催化剂（T_r = 50℃和S / C = 4-5），对于聚合物电解质燃料电池而言，足够的CO浓度（<10 ppm）所需的重整条件太苛刻。仅甲烷和焦炭与H_2O，H_2，CO和CO_2热力学共存，而C_2H_6，C_3H_8，i-C_4H_（10），n-C_4H_（10），CH_3OH，C_2H_5OH，C_3H_7OH，i-C_4H_9OH，n-C_4 C_2H_6O基本上被抑制为零。随着S / C比的增加，无焦区的温度降低。对于MeOH的完全转化，压力的影响可以忽略。

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