In this study, the iron-based chemical looping process driven by various biomasses for hydrogen production purposes is studied and evaluated thermodynamically through energy and exergy approaches. The overall system consists of some key units (combustor, reducers and oxidizer) a torrefier, a drying chamber, an air separation unit, a heat exchanger, and auxiliary units as well. The biomasses considered are first dried and torrified in the drying chamber and sent to reactors to produce hydrogen. The exergy and energy efficiencies of the iron based chemical looping facility are investigated comparatively for performance evaluation. The maximum exergy destruction and entropy production rates are calculated for the torrefaction process as 123.15 MW and 4926 kW/K respectively. Under the steady–state conditions, a total of 8 kg/s hydrogen is produced via chemical looping process. The highest energy efficiency is obtained in the looping of rice husk with 86% while the highest exergy efficiency is obtained in the looping using sugarcane bagasse with 91%, respectively.

中文翻译：

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不同生物质供给的铁基化学循环制氢评价


在这项研究中，通过能量和火用方法对由各种生物质驱动的用于制氢目的的铁基化学循环过程进行了热力学研究和评估。整个系统由一些关键单元（燃烧器、还原器和氧化器）、烘干机、干燥室、空气分离单元、热交换器和辅助单元组成。所考虑的生物质首先在干燥室中干燥和烘烤，然后送至反应器以产生氢气。对铁基化学链装置的火用和能源效率进行了比较研究，以进行性能评估。计算得出，烘焙过程的最大火用破坏率和熵产率分别为 123.15 MW 和 4926 kW/K。在稳态条件下，通过化学循环过程总共产生 8 kg/s 的氢气。稻壳循环的能量效率最高，为 86%；甘蔗渣循环的能量效率最高，为 91%。