基于能量等级回收和梯级利用的原则，构建了一种燃气轮机废热利用的新型动力系统。该系统主要由燃气轮机布雷顿循环(GTC)、再压缩式超临界CO2布雷顿循环(SCO2)、朗肯循环(RC)、有机朗肯循环（ORC）和有机闪蒸循环（OFC）组成。该动力系统不仅克服了单个子循环热量回收范围窄的局限性，而且通过回热的方式实现了能量的梯级利用，进而提高了系统效率。通过Aspen HYSYS软件对构建的动力系统及各子循环分别进行模拟仿真，进一步研究了工况参数对系统的影响。与现有文献中的数据对比表明，该动力系统中各子循环均得到较好的验证。在相同工况条件下，文献中动力系统净功率为48 592.84 kW，热效率和火用效率分别为42.41%和62.02%，而本研究系统净功率为50 040.46 kW，热效率和火用效率分别达到43.673%和73.593%。因此，该新型动力系统具有较好的能源利用效果。

Based on the principle of energy grade recovery and cascade utilization, a new power system for gas turbine waste heat utilization was constructed, which was mainly composed of gas turbine Brayton cycle (GTC), recompressive supercritical CO2 Brayton cycle (SCO2), Rankine cycle (RC), organic Rankine cycle (ORC) and organic flash cycle (OFC). The power system not only overcome the limitation of the narrow range of heat recovery in a single subcycle, but also realized the cascade utilization of energy by means of heat recovery, thus improving the efficiency of the system. The dynamic system and each subcycle were simulated by Aspen HYSYS software, and the influence of working conditions parameters on the system was further studied. Compared with the data in the existing literature, it shows that each subcycle in the power system is well verified. Under the same working conditions, the net power of the power system in the literature is 48 592.84 kW, and the thermal efficiency and exergy efficiency are 42.41% and 62.02% respectively, while the net power of this research system is 50 040.46 kW, and the thermal efficiency and exergy efficiency are 43.673% and 73.593% respectively. Therefore, the new power system has good energy utilization effect.

TK123

国家自然科学基金（51774143）;唐山市科技创新团队培养计划资助项目（21130207D）