动态热源的车载有机朗肯循环系统特性分析  

Respond Performance to Dynamic Heat Resource of Organic Rankine Cycle for Waste Heat Recovery on Vehicle

作　　者：赵力[1] 黄炜[1] 

机构地区：[1]天津大学中低温热能高效利用教育部重点实验室,天津300072

出　　处：《系统仿真学报》2016年第1期1-7,共7页Journal of System Simulation

基　　金：国家科技部863项目(2012AA051103);天津市科技支撑重大项目(11ZCZDGZ19800)

摘　　要：复杂路况造成汽车尾气参数呈现较强的动态特征,故有机朗肯循环(ORC,Organic Rankine Cycle)系统在尾气余热回收实际运行中往往偏离稳态设计工况点,造成实际效率偏低。针对此问题,建立了ORC系统动态模型,将热源动态特征分解为6种模式,分析了热源温度和流量阶跃对系统稳定性的影响。基于模拟结果的分析显示阶跃时间与系统稳定时间呈线性正相关;阶跃起始流量与系统稳定时间呈线性负相关;阶跃起始温度、阶跃温度变化值和流量变化值三者与稳定时间呈二次函数关系。相关研究结论对车载ORC系统控制设计有较好的指导意义。Complex traffic leads to a dynamic behavior of exhaust gas of vehicle. Therefore, a real operating of Organic Rankine Cycle（ORC）, which is used for heat recovery, deviates the design working condition at most of time with a low operating efficiency. To solve the problem, a dynamic model of ORC system verified by experiment result was built. The dynamic behavior of the heat resource, divided into 6 modes, was used as an input of external condition to the developed model. The impact results of the step mass flow rate and the temperature of heat resource to the stability of system were analyzed. The results show that step time is appropriately positive linear to stable time. The initial mass flow rate is negative correlate to the stable time. The stable time is the quadric function of initial temperature, step span of temperature and mass flow rate. The research results show a useful meaning to understanding the dynamic behavior of ORC on vehicle and developing of control strategy.

关 键 词：尾气 余热回收 朗肯循环 动态模拟 

分 类 号：TQ441.41[化学工程—化学肥料工业]