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Optimization of the combined supercritical CO_2 cycle and organic Rankine cycle using zeotropic mixtures for gas turbine waste heat recovery

机译：共沸混合物优化超临界CO_2循环和有机朗肯循环的组合，用于燃气轮机余热回收

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摘要

In order to further improve the efficiency of the gas turbine, a novel combined supercritical CO2 regenerative cycle and organic Rankine cycle using zeotropic mixtures for waste heat recovery of gas turbine is proposed. The zeotropic mixtures used in the present study are cyclopentane/R365mfc. Exergoeconomic analysis is reported for the proposed system and parametric studies have been carried out to investigate the effect of system parameters on the exergy efficiency and the unit cost of electricity. The multi-objective optimization method based on genetic algorithm is chosen to obtain the optimum system parameters. The results show that the overall values of the exergoeconomic factor, the optimal exergy efficiency and the optimal unit cost of electricity of the proposed system are 31.88%, 62.23% and 3.95 cent/kW h, respectively. The obtained result reveals the superiority of the proposed combined regenerative S-CO2 cycle and ORC system compared to the combined basic S-CO2 cycle and ORC system, the combined recompression S-CO2 cycle and ORC system. Therefore, the proposed system is suitable for gas turbine waste heat recovery, and it has advantages of deep utilization of waste heat, high efficiency and low cost.
机译：为了进一步提高燃气轮机的效率，提出了一种新型的利用共沸混合物的超临界CO2再生循环和有机朗肯循环的组合，用于燃气轮机的余热回收。本研究中使用的共沸混合物是环戊烷/ R365mfc。报告了拟议系统的用能经济分析，并进行了参数研究，以研究系统参数对用能效率和电力单位成本的影响。选择基于遗传算法的多目标优化方法，以获得最优的系统参数。结果表明，拟议系统的能效经济因素总值，最佳火用效率和最佳单位电费分别为31.88％，62.23％和3.95分/ kWh。获得的结果表明，与基本的S-CO2循环和ORC系统，再压缩的S-CO2循环和ORC系统相结合，所提出的再生S-CO2循环和ORC系统相结合的优越性。因此，该系统适用于燃气轮机余热回收，具有余热利用深度大，效率高，成本低的优点。

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