Thermodynamic analysis of a membrane-assisted chemical looping reforming reactor concept for combined H2 production and CO2 capture
Thermodynamic analysis of a membrane-assisted chemical looping reforming reactor concept for combined H2 production and CO2 capture
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DOI：
10.1016/j.ijhydene.2013.11.126
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发表时间：
2014-03
影响因子：
7.2
通讯作者：
J. Medrano;V. Spallina;M. S. Annaland;F. Gallucci
中科院分区：
文献类型：
--
作者：
J. Medrano;V. Spallina;M. S. Annaland;F. Gallucci
人们普遍认为，氢将成为未来重要的能源载体。目前，氢主要通过天然气/甲烷的蒸汽重整在大工业规模上生产，或者当小规模氢工厂需要高纯度氢时通过水的电解生产。虽然传统的蒸汽重整工艺是目前最经济的制氢工艺，但该工艺的总体能量和碳效率仍然相对较低，并且该工艺的改进是进一步实施氢气作为燃料源的关键。在文献中已经讨论了具有集成的CO2捕获的更有效的氢气生产的不同方法：化学循环燃烧（CLC）或化学循环重整（CLC）和膜反应器已经被提出作为相对于常规蒸汽重整工艺的更有效的替代反应器概念。然而，这些系统仍然存在一些缺点。在目前的工作中，提出了一种新的混合反应器的概念，结合了膜反应器系统的膜分离技术，讨论和比较与其他几种新技术。热力学研究的新反应器的概念，被称为膜辅助化学回路重整（MA-CO2），已进行了确定的氢气回收率，甲烷转化率以及在不同的操作条件下的整体效率，这是比较有利的其他新技术的H2生产与CO2捕获。
There is great consensus that hydrogen will become an important energy carrier in the future. Currently, hydrogen is mainly produced by steam reforming of natural gas/methane on large industrial scale or by electrolysis of water when high-purity hydrogen is needed for small-scale hydrogen plants. Although the conventional steam reforming process is currently the most economical process for hydrogen production, the global energy and carbon efficiency of this process is still relatively low and an improvement of the process is key for further implementation of hydrogen as a fuel source. Different approaches for more efficient hydrogen production with integrated CO2capture have been discussed in literature: Chemical Looping Combustion (CLC) or Chemical Looping Reforming (CLR) and membrane reactors have been proposed as more efficient alternative reactor concepts relative to the conventional steam reforming process. However, these systems still present some drawbacks. In the present work a novel hybrid reactor concept that combines the CLR technology with a membrane reactor system is presented, discussed and compared with several other novel technologies. Thermodynamic studies for the new reactor concept, referred to as Membrane-Assisted Chemical Looping Reforming (MA-CLR), have been carried out to determine the hydrogen recovery, methane conversion as well as global efficiency under different operating conditions, which is shown to compare quite favorably to other novel technologies for H2production with CO2capture.