A Comparative Energy and Exergy Analysis Between Organic Rankine Cycle and Kalina Cycle System 11 for the Waste Heat Recovery of a PEM Fuel Cell Power Station

Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2022-06-01 DOI:10.2478/bipie-2022-0008

V. Rezaee, A. Houshmand

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Abstract

Abstract In this study, the performance analysis of waste heat recovery systems in a power generation system consisting of 13000 Proton Exchange Membrane Fuel Cells (PEMFC) in a stack has been investigated. Organic Rankine Cycle (ORC) and Kalina Cycle System 11 (KCS11) as bottoming cycles to convert generated waste heat of stack into electricity were compared with each other in a defined hybrid system. The improvement of system with an exact energy and exergy analysis after utilizing the waste heat in the hybrid system has been analyzed. Results show that the energy efficiency of combined system using Organic Rankine Cycle and Kalina Cycle System 11 increase by about 5% and 1.75% respectively. In addition, exergy analysis results indicate that exergy efficiency of combined system using Organic Rankine Cycle and Kalina Cycle System 11 increases by about 4% and 1.5% respectively. The total exergy destruction rate obtained for the hybrid power systems is 235.5 kW when ORC is used and 329.7 kW when KCS11 is used respectively. Results show that in presented systems ORC has higher energy and exergy efficiencies than KCS11 but different used working fluids and equipment of systems must also be considered from an economical point of view.

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有机朗肯循环与Kalina循环系统11在PEM燃料电池电站余热回收中的能量与火用比较分析

摘要本研究对13000个质子交换膜燃料电池(PEMFC)堆叠发电系统中的余热回收系统进行了性能分析。以有机朗肯循环(ORC)和Kalina循环系统11 (KCS11)为底循环，在确定的混合动力系统中进行了将烟囱产生的余热转化为电能的比较。通过精确的能量和火用分析，分析了利用混合动力系统余热后对系统的改进。结果表明，采用有机朗肯循环和Kalina循环系统11的联合系统的能效分别提高了约5%和1.75%。此外，用能分析结果表明，采用有机朗肯循环和Kalina循环系统11联合系统的用能效率分别提高了约4%和1.5%。采用ORC和KCS11时，混合动力系统的总火用破坏率分别为235.5 kW和329.7 kW。结果表明，在上述系统中，ORC比KCS11具有更高的能量和火用效率，但也必须从经济的角度考虑不同系统使用的工质和设备。

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Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section

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