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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019028447
pages 129-146

THERMODYNAMIC ANALYSIS AND SYSTEM DESIGN OF THE SUPERCRITICAL CO2 BRAYTON CYCLE FOR WASTE HEAT RECOVERY OF GAS TURBINE

Min Xie
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, China, 710049; Harbin Electric Company Limited, Harbin, China, 150028
Yong Hui Xie
Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, China, 710049
Yichuan He
Harbin Electric Company Limited, Harbin, China, 150028
Aihua Dong
Harbin Electric Company Limited, Harbin, China, 150028
Chunwei Zhang
Harbin Electric Company Limited, Harbin, China, 150028
Yuwen Shi
Harbin Electric Company Limited, Harbin, China, 150028
Qiuhong Zhang
Harbin Electric Company Limited, Harbin, China, 150028
Qiguo Yang
Harbin Electric Company Limited, Harbin, China, 150028

ABSTRACT

The supercritical CO2 cycle is regarded as a potential replacement of steam on concentrated solar power, new generation nuclear reactor, fossil combustion power, waste heat recovery, and so on. It has advantages in high energy flux density, compact equipment, higher cycle efficiency, product modularization. In this paper, the thermodynamic analysis of supercritical CO2 Brayton cycle for the waste heat recovery of the LM2500 gas turbine is discussed with the energetic and exergetic analyses via a system simulation program. The efficiency of waste heat utilization should be considered as the prior target in the system design and optimization. As regards the basic cycle, there are huge energy/exergy losses from the boiler due to the high temperature exit gas and the temperature gap between the exhausted gas and the supercritical CO2. Besides, in the recuperator, the exergy loss is also significant due to the temperature difference on both sides. Therefore, an energy classification utilization cycle (the advanced cycle) is designed and analyzed. In both the energetic and exergetic analyses, the advanced cycle shows good system performances. Through the optimization, the advanced cycle can output the maximum net power as 8.81-MW higher 2.35MW output than the basic cycle, with the efficiency of waste heat utilization of 25.10% and the efficiency of exergy of 64.78% increased by 6.7% and 17.28% compared to the basic cycle, respectively.

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