回收船舶柴油机余热的有机朗肯循环系统热力学性能比较分析

利用有机朗肯循环(ORC)系统对某型号船舶柴油机(最大持续功率为996 kW)的余热进行回收,以系统净输出功为指标,对比分析5种不同结构形式的ORC系统的热力学性能,结果表明:回收柴油机排烟余热的基础ORC系统最大净输出功达49.83 kW;增设回热器进一步回收膨胀机出口工质废热后,系统最大净输出功达54.84 kW;...

Comparative Analysis of Thermodynamics Performances of ORC Systems Recovering Waste Heat from Ship Diesel Engines

ORC system was used to recover the waste heat of a certain type of ship diesel engines（maximum continuous rating 996 kW）. The performances of five different structure ORC systems were compared and analyzed on their net output powers. The results show that the maximum net output power of the basic ORC system that recovers the exhaust gas waste heat of the ship diesel engines is as 49.83 kW； by only adding a regenerator to further recover the waste heat of the expander outlet working fluid， the maximum net output power reaches 54.84 kW； while by adding a preheater to recover the waste heat of the ship diesel engine jacket cooling water， the number is up to 58.88 kW， which is 18.1% higher than that of the basic ORC systems. Using the independent dual-cycle ORC system to recover the waste heat of ship diesel engine exhaust gas and jacket cooling water simultaneously only make the maximum net output power 2.84% higher than that of the ORC system with preheater， which is as 60.6 kW. Therefore， considering of ship space constraints， operation and maintenance reliability， the ORC system with preheater should be given priority to recover the waste heat of the ship diesel engines.