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Thermodynamics analysis of air Brayton cycle for waste heat recovery of the gas turbine on off-shore platforms

ZHANG Qiang;NING Shuaiqing;CHEN Chen;School of Energy and Power Engineering, Jiangsu University of Science and Technology;  
The thermal design scheme based on air Brayton cycle is proposed to recover the waste heat of a gas turbine in off-shore platforms. Thermodynamic and economic analysis models with two stage compressors and intercooling are built. Thermodynamic analysis of working process considering the variation of air specific heat is conducted in detail. The effects of the total pressure ratio, turbine inlet temperatures, and compressor pressure ratio distribution on system performance are obtained parametrically. Results based on process simulation show that the total pressure ratio for the optimal thermodynamic performance is different from the value calculated using the economic performance as optimal objective. The system could get better trade-off between thermodynamic and economic performances when the compressor pressure ratio distribution is 6 ∶4.
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