Abstract
The present study is a thermodynamic analysis of a Regenerative Air-Bottoming combined (RABC) cycle /Steam bottoming combined (RABC) cycle operated by the exhaust gases the topping gas turbine cycle. The fractional mass of exhaust gases passes through the first heat exchanger where it exchanges heat with the compressed air from the air compressor of topping cycle and remaining amount of exhaust gasses passes through a second heat exchanger where it uses to supply heat to RABC cycle or third heat exchanger where it uses to supply heat to RSBC cycle. The energetic and exergetic performance of RABC cycle and RSBC cycle is investigated using turbine inlet temperature (1000 K⩽ TIT⩽1500 K) and mass fraction of exhaust gas (0⩽x⩽1) of the topping cycle as the input variables. The work net output attained its peak value at x=0 which is 22.1 % to 27.3 % for RABC cycle and 22.7 % to 21.5 % for RSBC cycle whereas the maximum thermal efficiency and minimum specific fuel consumption is observed at x=1. Also exergy loss by exhaust gases is minimum at x=0 for both RABC cycle and RSBC cycle. Finally, it is concluded that for the maximum work net output and minimum exergy loss by exhaust gases, RABC cycle is the best option followed by RSBC cycle but for optimum thermal efficiency and minimum specific fuel consumption purely regenerative gas turbine cycle have no comparison with RABC cycle and RSBC cycle.
Highlights
For the country’s economy and industries growth, Capacity power generation is an essential need
The mass fraction of exhaust gasses (x) and turbine inlet temperature (TIT) of topping cycle are use as the independent variables to analyse the performance of topping cycle, Regenerative Air-Bottoming combined (RABC) cycle and RSBC cycle
The present study focus on the analyses of energy related parameters like work net output, thermal efficiency, and specific fuel consumption and exergy related parameters like exhaust gasses exergy loss, plant exergy and exergy efficiency
Summary
For the country’s economy and industries growth, Capacity power generation is an essential need. By varying the turbine inlet temperature and pressure ratio of the topping cycle, this study evaluates the three suggested combined cycle energetic performance like thermal efficiency, work net output, specific fuel consumption (SFC), and exergetic performance like exhaust gas exergy losses and exergy destruction. Study focus on major parameters that effects the plant performance and suggest some section of improvement to improve the gas turbine power plant performance and min minimize the losses It is observed from the above literature survey; CCP plant performance may be enhanced by several techniques. The novelty of the present study is that it investigates the energetic and exergetic performance of the Air-bottoming/Steam-bottoming combined cycle by varying the mass fraction of exhaust gasses and TIT of the topping cycle. Energetic and exergetic performance of topping cycle, RABC cycle and RSBC cycle by varying the TIT of topping cycle (1000K⩽ TIT⩽1500K) and mass fraction of exhaust gasses (0⩽x⩽1) are presented graphically
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