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工质的热力性能是朗肯循环的重要影响因素,故为了回收处于不同品味的发动机排气、冷却水余热、汽轮机中膨胀后的工质乏气的能量,本文针对一种双朗肯联合循环,选择了water-Ethanol,water-R123,water-R1270,water-R134a和water-R290五种工质来进行研究,并对不同工质下系统的性能进行比较.结果表明,在循环热效率方面,water-Ethanol系统最优;在系统膨胀功方面,water-R123系统最优。Water-Ethanol系统的第二级循环的体积膨胀比最大,需采用两级或多级膨胀机。
Therefore, in order to recover the energy of engine exhaust gas, cooling water remaining heat, and working gas exhausted in the steam turbine, in order to recover a double Rankine cycle, the thermal performance of working fluid is an important factor of Rankine cycle. , And five working fluids such as water-Ethanol, water-R123, water-R1270, water-R134a and water-R290 were chosen to study the performance of the system under different working conditions.The results showed that in the aspect of thermal efficiency, The water-Ethanol system is optimal; the water-R123 system is optimal in terms of system expansion work. The second cycle of the Water-Ethanol system has the largest volume expansion ratio, requiring two or more stages of expansion.