Power System of Diesel Engine Waste Heat Recovery With a ORC System
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摘要: 针对柴油机排气余热的特点设计了有机朗肯循环(organic Rankine cycle,ORC)系统.在该系统中,采用R245fa(1,1,1,3,3-五氟丙烷)作为循环工质,针对其不同蒸发温度以及冷凝温度,通过模拟计算研究了最终排气温度、系统净输出功率和朗肯循环实际效率的变化规律.研究结果表明,当蒸发温度低于367.46 K时应采用一级膨胀系统;当蒸发温度高于367.46 K低于404.6 K时应采用二级膨胀系统;冷凝温度恒定时,最终排气温度随蒸发温度的升高而降低,系统净输出功率和朗肯循环实际效率随蒸发温度的升高而升高;蒸发温度恒定时,最终排气温度随冷凝温度的降低而降低,系统净输出功率和朗肯循环实际效率随冷凝温度的降低而升高.Abstract: To reuse the diesel engine of waste heat in exhaust,organic Rankine cycle(ORC) was proposed.R245fa(1,1,1,3,3-pentaflu-oropropane) was used as the working fluid in the ORC system.Final exhaust temperature,net work and actual efficiency of ORC were studied under different evaporating temperature and cooling temperatures.The results show that primary expansion system should be selected when the evaporating temperature is lower than 367.46 K.However,when the evaporating temperature is higher than 367.46 K but lower than 404.6 K,two-level expansion system is recommended.For a fixed cooling temperature,final exhaust temperature is decreased,but net work and actual efficiency of ORC are increased with the increase of the evaporating temperature.Under a given evaporating temperature,final exhaust temperature is decreased,but net work and actual efficiency of ORC are increased with the decrease of cooling temperature.
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Keywords:
- waste heat /
- organic Rankine cycle /
- diesel engine
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