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| Performance analysis and optimization of supercritical CO2 Brayton cycle coupled with organic flash cycle |
Tingfang YU( ),Genli ZHANG,Jiapeng ZHOU,Yicun TANG*() |
| School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
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Abstract In order to improve the thermal efficiency of the supercritical CO2 recompression Brayton cycle (SCRBC), an organic flash cycle (OFC) was coupled at the waste heat end of SCRBC as the bottom cycle for low-temperature waste heat utilization, and a solar tower-based SCRBC/OFC combined cycle was established. Under the set conditions, parameter analysis and exergy analysis were conducted on the effects of the main parameters of the combined cycle such as the split ratio, top-cycle turbine inlet pressure and temperature, turbine efficiency, flash temperature, and condensation temperature on the thermal performance of the system. Parameter analysis results show that there is an optimal split ratio at different top-cycle turbine inlet pressures and temperatures, and the optimal split ratio increases with the increase of turbine inlet pressure. The thermal efficiency of the system decreases with the increase of condensation temperature, and as the flash temperature increases, the thermal efficiency first increases and then decreases. The exergy loss analysis shows that under the given condition, the printed circuit heat exchanger (PCHE) has the highest exergy loss, followed by the SCRBC turbine, precooler, and reheater. A multi-objective optimization method was used to obtain a Pareto solution set that takes both system thermal performance and unit investment cost into consideration, and the optimal compromise solution was provided as a reference for engineering design schemes. The optimized SCRBC/OFC improves the thermal efficiency of the combined cycle by 12.5% compared to the unoptimized SCRBC.
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Received: 30 November 2023
Published: 18 January 2025
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| Fund: 国家自然科学基金资助项目（52166009）. |
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Corresponding Authors:
Yicun TANG
E-mail: yutingfang@ncu.edu.cn;412400220134@email.ncu.edu.cn
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超临界CO2布雷顿循环耦合有机闪蒸循环的性能分析及优化
为了提高超临界CO2再压缩布雷顿循环（SCRBC）的热效率，在SCRBC余热端耦合有机闪蒸循环（OFC）作为低温余热利用的底循环，建立基于太阳能塔的SCRBC/OFC联合循环. 在设定条件下，进行联合循环的主要参数（如分流比、顶循环透平入口压力和温度、透平效率、闪蒸温度和冷凝温度）对系统热力性能影响的参数分析和?分析. 参数分析结果表明，在不同的顶循环透平入口压力和温度下存在最佳分流比，该分流比随透平入口压力的提高而上升；系统热效率随着冷凝温度增加而降低，随闪蒸温度的增加先增后降. ?损分析结果表明，在给定的条件下，印刷电路板式换热器（PCHE）?损失最大，之后依次为SCRBC透平、预冷器、回热器. 采用多目标优化方法得到兼顾系统热力性能和单位投资成本的Pareto解集，为工程设计方案提供了最优折中解作为参考. 相比优化前的SCRBC，优化后SCRBC/OFC使联合循环的热效率提高了12.5%.
关键词：
热力循环,
超临界CO2 再压缩布雷顿循环,
有机闪蒸循环,
热力性能分析,
多目标优化
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