潜热利用式复合有机朗肯循环余热回收系统构建及优化-partA

In order to make full use of the high exhaust gas temperature and reduce the latent heat loss,a compound organic Rankine cycle system with latent heat utilization is designed,which consists of two stages of high-temperature organic Rankine cycle(HTORC)and low-temperature organic Rankine cycle(LTORC),and is used to recover the high-temperature exhaust gas,medium-temperature coolant and latent heat of the working medium of a heavy-duty diesel engine.Wherein,the high-temperature cycle and the low-temperature cycle are coupled by an integrated evaporator/condenser,i.e.,the low-temperature side of the mass condenses the high-temperature side of the mass while realizing the function of energy quality improvement of the low-temperature side of the mass and latent heat reuse of the high-temperature side of the mass.The results show that compared with the separate waste heat recovery systems for high-temperature exhaust gas and medium-temperature coolant,the latent heat utilization type composite system uses the high-temperature cycle condenser to further heat the low-temperature cycle and enhance the evaporation state of the low-temperature cycle working mass,which can give fuller play to the work potential of the low-temperature cycle.