CO_2跨临界动力循环性能理论及实验研究  

Theoretical and Experimental Study on Performance of CO_2 Transcritical Power Cycle

作　　者：潘利生[1] 魏小林[1] 李博[1] 

机构地区：[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190

出　　处：《工程热物理学报》2015年第3期478-481,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51306198)

摘　　要：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。Power cycle using unconventional working fluid has significant advantages in recovering low-grade heat energy efficiently.CO_2 is environment friendly and is an ideal working fluid for power cycle using low-grade heat energy.Theoretical and experimental methods are used to study on theoretical cycle performance of CO_2 transcritical power cycle and expander performance.The results show that when regenerator is not used,thermal oil outlet temperature increases with the increase of heating pressure and doesn't vary with inlet temperature at turbine entrance.When regenerator is used,there is maximum of thermal oil outlet temperature with the increase of heating pressure.There are maximum thermal efficiency and net power output with the increase of heating pressure.Regenerator can enhance thermal efficiency and net power output significantly.Preliminary experimental results show that internal leakage impacts on CO_2 rolling rotor expander performance and internal leakage should be as lower as possible in order to enhance expander performance.

关 键 词：CO₂ 跨临界动力循环 回热器 滚动转子膨胀机 

分 类 号：TB653[一般工业技术—制冷工程]