Energy quality factor and exergy destruction processes analysis for chemical looping hydrogen generation by coal,International Journal of Energy Research

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Energy quality factor and exergy destruction processes analysis for chemical looping hydrogen generation by coal
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-11-16 , DOI: 10.1002/er.6180
Fan Zhang _{1,

2} , Lin Zhu ₂ , Yuan Wang ₂ , Ling Sun ₂

Affiliation

Chemical looping hydrogen generation (CLHG) is a hydrogen production process with broad prospects for its advantages of not requiring H₂ purification process and direct CO₂ capture. Presently, the research on the integrated system of CLHG focuses on the impact of integrated processes and operating variables on the overall energy efficiency and exergy efficiency of the system. However, the research on the matching relationship between quantity and quality in the process of energy conversion is insufficient, and the flow direction of exergy and the specific exergy destruction process for equipment are not clear. The integrated system of coal gasification (CG) and three reactors CLHG was established in this paper with a hydrogen production efficiency of 42.55% and system exergy efficiency of 52.98%. This paper studied the exergy flow direction and efficiency of the equipment in the system, providing the improved direction for the amelioration of the system; a detailed description was present on the change process of energy quality in each equipment with energy quality factor, and the concept of energy quality factor ratio was proposed as an evaluation tool for matching the quantity and quality of energy in the system. It is calculated that the ratio of energy quality factor of the integrated system of CG and CLHG is 0.944. By comparing with the energy quality ratio of the traditional CG hydrogen production system (0.896), it can be concluded that the integrated system of CG and CLHG has a better energy matching relationship.

中文翻译：

煤化学循环制氢的能量品质因数和（火用）破坏过程分析

化学循环制氢（CLHG）是一种制氢工艺，具有不需要H ₂纯化工艺和直接CO _2的优点，具有广阔的前景捕获。目前，对CLHG集成系统的研究集中在集成过程和操作变量对系统整体能效和火用效率的影响上。但是，对于能量转换过程中数量与质量的匹配关系的研究还不够，设备的火用流向和具体火用破坏过程还不清楚。本文建立了煤气化和三个反应器CLHG的集成系统，制氢效率为42.55％，系统火用效率为52.98％。研究了系统中设备的火用流向和效率，为改善系统提供了改进的方向。详细介绍了每种设备的能量质量随能量质量因数变化的过程，提出了能量质量因数比的概念作为匹配系统中能量数量和质量的评估工具。计算得出，CG与CLHG一体化系统的能量品质因数比为0.944。通过与传统CG制氢系统的能量质量比（0.896）进行比较，可以得出结论：CG与CLHG的集成系统具有更好的能量匹配关系。计算得出，CG与CLHG一体化系统的能量品质因数比为0.944。通过与传统CG制氢系统的能量质量比（0.896）进行比较，可以得出结论：CG与CLHG的集成系统具有更好的能量匹配关系。计算得出，CG与CLHG一体化系统的能量品质因数比为0.944。通过与传统CG制氢系统的能量质量比（0.896）进行比较，可以得出结论：CG与CLHG的集成系统具有更好的能量匹配关系。

更新日期：2020-11-16

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