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Autothermal reforming of ethanol in a fluidized bed membrane reactor for ultra-pure hydrogen production

机译：在流化床膜反应器中乙醇的自热重整以生产超纯氢

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In recent years, many efforts have been made to develop processes and reactortechnologies for the production of cheap, ultra-pure hydrogen that can be used in efficientPEM fuel cells. Nowadays, hydrogen is mainly produced by steam reforming of natural gasin multi-tubular reactors. The main drawback of natural gas reforming is that this reactionleads to a H2 rich gas mixture also containing carbon oxides and other by-products.Consequently, in order to produce pure H2, chemical processes are carried out in a numberof reaction units (typically high temperature reformer, high and low temperature shiftreactors) followed by separation units (mostly pressure swing adsorption units are used).An attractive way to produce hydrogen is the reforming of renewable fuels (e.g. bio-ethanol)inside membrane reactors, where hydrogen production and hydrogen separation throughselective membranes are integrated in one apparatus.In this paper the production of ultra-pure hydrogen via autothermal reforming ofethanol in a fluidized bed membrane reactor has been studied. The steam reforming ofethanol is an endothermic reaction requiring a great amount of heat. The needed energy forthe steam reforming is obtained by burning part of the hydrogen recovered via the hydrogenperm-selective membrane. In this configuration, the air used for the combustion is never incontact with the reacting mixture, which makes thus autothermal reforming with integratedCO_2 capture feasible. Simulation results based on a phenomenological model show that itis possible to obtain overall autothermal reforming of ethanol while 100% of hydrogen canin principle be recovered at relatively high temperatures and at high reaction pressures. Atthe same operating conditions, ethanol is completely converted, while the methaneproduced by the reaction is completely reformed to CO, CO_2 and H_2.
机译：近年来，为开发工艺和反应器做出了许多努力 生产廉价，超纯氢的技术，可以高效利用 PEM燃料电池。如今，氢气主要是通过天然气的蒸汽重整产生的 在多管反应器中。天然气重整的主要缺点是该反应 导致生成的富H2气体混合物也包含碳氧化物和其他副产物。 因此，为了生产纯净的氢气，需要进行大量的化学过程 反应单元的数量（通常是高温重整器，高低温转变 反应器），然后是分离装置（大多使用变压吸附装置）。 产生氢气的一种有吸引力的方法是可再生燃料（例如生物乙醇）的重整 在膜反应器内，通过氢产生和氢分离 选择性膜被集成在一个设备中。 本文通过自热重整制氢生产超纯氢 已经研究了流化床膜反应器中的乙醇。蒸汽重整 乙醇是需要大量热量的吸热反应。所需的能量 蒸汽重整是通过燃烧通过氢气回收的部分氢气来实现的 选择性渗透膜。在这种配置下，用于燃烧的空气永远不会进入 与反应混合物接触，从而使自热重整与 CO_2捕获可行。基于现象学模型的仿真结果表明 可以实现乙醇的整体自热重整，而100％的氢气可以 原则上，可以在较高的温度和较高的反应压力下进行回收。在 在相同的操作条件下，乙醇被完全转化，而甲烷 反应产生的产物完全重整为CO，CO_2和H_2。

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