Abstract In the present study, performance improvement of SRC and ORC systems used as a bottoming system in a GT based triple combined system was evaluated for varying turbine inlet temperature and pressure. In the first step, SRC was parametrically optimized for a varying pressure (from 10 bar to 100 bar) and temperature (from saturated steam temperature to 480 °C). In the second step, a parametric optimization is performed to comprehensively evaluate the effects of acetone, R113, R141b, R152a, R245fa and R365mfc on thermodynamic performances of ORC (Organic Rankine Cycle) with the increasing turbine inlet pressure and temperature. Along with the optimization, the ORC turbine inlet pressure was heightened from 7.5 bar to the critical pressures of the working fluids with the increments of 2.5 bar. The ORC turbine inlet temperature was varied between saturation temperature and the maximum working temperature of selected working fluids. Finally, energy and exergy efficiencies of the overall triple combined system (GT-SRC-ORC) was calculated by depending on pressure, temperature and working fluids. As a result, the best working fluids among the selected fluids was found as R141b. Maximum net thermal efficiency, exergy efficiency and a net power of the ORC with R141b were calculated as 22.6%, 64.76% and 780.35 kW at 40 bar and 225 °C, respectively. Net thermal and exergy efficiency of the overall system (GT-SRC-ORC) with R141b was found 47.65%, 67.35%, respectively. By this way, the waste heat recovery corresponding to 734.57 kg/h natural gas which is equivalent to 2203.73 kg-CO2/h emissions was carried out.

中文翻译：

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使用燃气轮机 (GT) 作为顶部循环的三联系统的底部蒸汽朗肯循环 (SRC) 和有机朗肯循环 (ORC) 系统的性能改进

摘要 在本研究中，在基于 GT 的三重组合系统中用作底部系统的 SRC 和 ORC 系统的性能改进评估了不同的涡轮入口温度和压力。在第一步中，SRC 针对不同的压力（从 10 bar 到 100 bar）和温度（从饱和蒸汽温度到 480 °C）进行了参数优化。第二步，进行参数优化，综合评估丙酮、R113、R141b、R152a、R245fa和R365mfc对ORC（Organic Rankine Cycle）热力学性能的影响，随着涡轮进口压力和温度的增加。随着优化，ORC涡轮入口压力从7.5 bar提高到工作流体的临界压力，增量为2.5 bar。ORC 涡轮入口温度在饱和温度和选定工作流体的最高工作温度之间变化。最后，根据压力、温度和工作流体计算整个三重组合系统 (GT-SRC-ORC) 的能量和火用效率。结果，在选定的流体中发现最好的工作流体是 R141b。使用 R141b 的 ORC 的最大净热效率、火用效率和净功率在 40 bar 和 225 °C 下分别计算为 22.6%、64.76% 和 780.35 kW。发现使用 R141b 的整个系统 (GT-SRC-ORC) 的净热效率和火用效率分别为 47.65% 和 67.35%。通过这种方式，进行了734.57 kg/h天然气对应的余热回收，相当于2203.73 kg-CO2/h排放。