Abstract
The purpose of this study is to explore the effects of working fluid on conventional combined cycle integrated with pressurized solid oxide fuel cell (SOFC) and waste heat recovery organic Rankine cycle (ORC) for stationary utility power generation. The mathematical model of a natural gas fueled design configuration is developed in Matlab and Simulink and simulated with 14 working fluids. The effluent gases of SOFC undergo combustion in the combustion chamber and it is utilized in the gas turbine, steam turbine cycle and ORC. The model is compared with those found in literature and the parametric studies of temperature, flow rate, fuel utilization factor and exhaust gas on the system efficiency are examined. Results revealed that working fluids show a closely related behavior in efficiency at low pressure ratio and high flow fraction, fuel utilization, and temperature. R-123 was found to perform the best among 14 working fluids studied, yielding a system energy efficiency of 70% in the combined cycle integrated with SOFC and ORC.
Highlights
The United States consumed 38% of its primary energy of 97.7 quadrillion Btu on the electric power sector in 2017 [1]
The purpose of this study is to explore the effects of working fluid on conventional combined cycle integrated with pressurized solid oxide fuel cell (SOFC) and waste heat recovery organic Rankine cycle (ORC) for stationary utility power generation
The study was verified by comparing with those available in literature and the results showed that an average efficiency of 66% is obtainable
Summary
The United States consumed 38% of its primary energy of 97.7 quadrillion Btu on the electric power sector in 2017 [1]. The utility companies need to reduce cost of electricity and increase efficiency, lower air pollutants and greenhouse gas [2]. The outcomes indicate that in single power plants, R11, R141b, R113 and R123 manifest slightly higher thermodynamic performances than the others; R245fa and R245ca are the most environment-friendly working fluids for engine waste heat recovery applications
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