刘江楠，金晶，刘敦禹.有机朗肯循环系统布置及参数优化对低速柴油机余热利用的影响及经济性分析[J].内燃机工程,2018,39(1):49-55.
有机朗肯循环系统布置及参数优化对低速柴油机余热利用的影响及经济性分析
Effect of Organic Rankine Cycle System Layout and Parameter Optimization on Low Speed Diesel Engine Waste Heat Utilization and Economic Analysis
DOI：
关键词:有机朗肯循环  Aspen Plus  经济性分析  效率
Key Words:organic Rankine cycle  Aspen Plus  economic analysis  efficiency
基金项目:
作者单位
刘江楠，金晶，刘敦禹 上海理工大学 能源与动力工程学院，上海 200093 
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摘要:利用Aspen Plus建立计算模型，分析运行参数及系统布置形式对有机朗肯循环性能的影响，并以净输出功率和系统所需的总换热面积的比值作为经济性指标分析其经济性。结果表明：蒸发温度、蒸发压力和有机工质流量对有机朗肯循环的净输出功率均有一定的影响，其中改变有机工质流量影响最大，蒸发温度次之；综合考虑经济性和净输出功率，柴油机全负荷下系统在蒸发温度160 ℃、蒸发压力2.5 MPa、有机工质流18kg/s时性能最优。工质流量影响最大且易控制，在不同柴油机运行工况下只需改变有机工质流量就可适应负荷变化，负荷越大回收的能量越多，其净输出功率均占柴油机主机功率的8%左右。添加内回热器使系统热效率提高2.65%，效率提高4.5%，再增加一个低温循环，净输出功率可增加94.90 kW。
Abstract:Based on the calculation model established by the Aspen Plus software, the influence of the operating parameters and system layout on the performance of the organic Rankine cycle was analyzed. And the economic efficiency of the system was evaluated by using the ratio of the net output power to the total heat transfer area required by the system as a judgment indicates. Results show that three parameters including evaporation temperature, evaporation pressure and organic working fluid flow have a certain effect on the net output power of the organic Ranking cycle. Among which the influence of the organic working fluid flow is the most important indicator followed by the evaporation temperature. In view of the combined consideration of economy and net output power, when the diesel engine is running at full load, the system has the best performance under the conditions of evaporation temperature of 160 ℃, evaporation pressure of 2.5 MPa and organic working fluid flow rate of 18 kg/s. The organic working fluid flow is the most influential and is easy to operate. Under different diesel engine operating conditions changing the organic working fluid flow can make the engine adapt to load changes. The greater the load, the more energy is recovered, resulting in an net output power of up to 8% of the diesel engine power. The installation of an internal regenerator in the system improves the thermal efficiency by 2.65% and then, adding a low temperature cycle an make the net power output increase by 94.90 kW.
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