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非常规工质动力循环具有高效回收低品位热能的显著优势,CO_2环境友好,是较为理想的利用低品位热能的动力循环工质。采用理论和实验方法研究了CO_2跨临界动力循环的理论循环性能和膨胀机性能。研究结果表明,无回热时导热油出口温度随加热压力的升高而升高,并且不随膨胀机进口温度的变化而变化;有回热时导热油出口温度受回热器换热的影响存在极大值。随着超临界加热压力的升高,循环热效率和净输出功率存在极大值;回热能够显著提高循环热效率和净输出功率。初步实验结果表明内部泄露对CO_2滚动转子膨胀机性能具有重要影响,为提升膨胀机性能需尽量降低膨胀机内部泄露。
Unconventional working fluid power cycle has the obvious advantages of efficient recovery of low-grade heat energy, CO 2 environment-friendly, is an ideal use of low-grade thermal energy of the power cycle refrigerant. Theoretical and experimental methods were used to study the theoretical cycle performance and expander performance of the transcritical CO_2 cycle. The results show that the outlet temperature of the HTF increases with the increase of the heating pressure without regenerative heating and does not change with the inlet temperature of the expander. The outlet temperature of the HTF is affected by the heat transfer of the regenerator maximum. With the increase of supercritical heating pressure, there is a maximum of circulating thermal efficiency and net output power; regenerative heating can significantly improve the cycle thermal efficiency and net output power. The preliminary experimental results show that the internal leakage has an important influence on the performance of the CO_2 rolling rotor expander. To improve the performance of the expander, internal leakage of the expander must be reduced as much as possible.