柴油机变工况余热回收TEG-ORC联合系统的性能模拟

Performance Simulation of Diesel Engine's TEG-ORC Waste Heat Recovery System in Different Engine Conditions

对某车用柴油机进行热负荷实验,根据其不同工况下的排气特点,设计了一个用于余热回收的温差发电(thermoelectric generator,TEG)-有机朗肯循环(organic Rankine cycle,ORC)联合系统.通过模拟计算研究了柴油机不同工况下该联合系统性能的变化规律.研究结果表明:TEG-ORC联合循环实现了余热梯级利用,联合系统的输出功率最高可达30.36,k W,其中TEG系统为2.24,k W,ORC系统为28.12,k W;柴油机指示热效率最高可以提高5.52%,加装联合系统后其指示热效率最高值为47.1%.

The characteristics of vehicle diesel engine gas exhaustion under various operating conditions were studied experimentally and a set of waste heat recovery system based on thermoelectric generator （TEG） and organic Rankine cycle （ORC） was designed. The performance of combined TEG-ORC system under various operating conditions was analyzed by simulation. The results indicate that combined TEG-ORC system achieved the graded use of waste energy, the performance of which is better than that of the single TEG or ORC system. The output power of com- bined system can reach as high as 30.36 kW, with TEG＇s output power being 2.24 kW and ORC＇s output power 28.12 kW. The indicated thermal efficiency of diesel engine increases by as much as 5.52%, and the maximum indi- cated thermal efficiency of the diesel engine with combined system is 47.1%.