基于有机朗肯循环的船用柴油机余热回收系统研究

Study of Waste Heat Recovery System for Marine Diesel Engine Based on Organic Rankine Cycle

本文针对某船用柴油机,利用有机朗肯循环技术,设计系统回收废气余热和主机冷却水余热,两套余热回收系统的热效率分别为21.1%和5.3%,总净功率为102.2 kW,可将柴油机的输出功率提升10.3%。在两套独立系统的基础上,进行优化并提出了主机冷却水预热、废气蒸发的方案,探讨了预热温度对系统性能的影响。优化后的系统,净功率为100.8kW。优化方案的净功率略有降低,但大大简化了系统、降低了投入成本和占用空间。

This paper focuses on waste heat recovery for a marine diesel engine, using ORC technology. Two separated ORC for both waste heat from jacket cooling water and engine exhaust gas are designed, with thermal efficiency of 21.1% and 5.3%, respectively. The total net power output reaches 102.2 kW and results in 10.3% increase in engine power. To simplify the waste heat recovery, an optimized system using jacket cooling water as preheating medium and engine exhaust gas for evaporation is presented. The influence of preheating temperature on system performance is evaluated. The net power output of the optimized system reaches 100.8 kW. Though the power output is a little lower, compact system structure, low capital cost and low space occupation are the advantages of the optimized ORC system.