有机工质向心透平变工况性能预测及系统性能分析  

OFF-DESIGN PERFORMANCE PREDICTION AND SYSTEM THERMAL PERFORMANCE ANALYSIS OF RADIAL TURBINE WITH ORGANIC FLUID

作　　者：韩中合[1] 赵若丞 范伟[1] Han Zhonghe;Zhao Ruocheng;Fan Wei(Key Lab of Condition Monitoring and Control for Power Plant Equipment(North China Electric Power University),Ministry of Education,Baoding 071003,China)

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室

出　　处：《太阳能学报》2019年第12期3409-3416,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金（51306059）;国家科技支撑计划（2014BAA06B00）;中央高校基本科研业务费专项（2014MS151）

摘　　要：在以工业烟气余热为热源的有机朗肯循环系统中,当工业生产过程发生调整时烟气参数会发生变化,导致系统热力参数有所改变,向心透平偏离设计工况运行,且在变工况时透平性能的变化直接影响系统热力性能。以150℃低温烟气为热源,采用R245fa为工质,确定设计工况,对向心透平进行设计。采用CFD软件模拟透平在设计工况和热源参数变动导致的变工况条件下的运行状况,提出重构过程法求解透平热力性能参数,对透平变工况热力特性进行预测,分析变工况时透平性能与系统热力性能的关系。结果表明,变工况时透平相对内效率呈现先增大后减小的趋势,功率相对设计工况下降了35.258 kW。在透平各项损失中余速损失最大,当热源温度在130℃以下时摩擦损失系数的增大仅次于余速损失系数;热源温度降低则系统热效率下降,与透平相对内效率相比,理想循环热效率对系统热效率的影响更大。The Organic Rankine Cycle system is applied effectively in the waste heat recovery.When the adjustment of industrial production process leads to the variation of heat source parameters,the system thermodynamic parameters also produce the corresponding changes,which causes the radial-inflow turbine operating in the off-design conditions.The variation of the turbine performances during the off-design conditions has an important impact on the system thermal performance.For the low-temperature gas of 150℃,the preliminary design and performance analysis of the radial-inflow turbine with R245fa is conducted.Numerical simulation is used in the design and off-design conditions for the turbine.To obtain the precise parameters about performance of the turbine,a novel method of reconfiguration process is proposed.Based on the method,the performance of the turbine in the off-design conditions can be predicted and analyzed.The results show that there is an optimal relative internal efficiency of the turbine under the off-design conditions and the decrease of the power output compared with the design condition which reaches 35.258 kW.Exhausted velocity loss is the largest among all the losses in the turbine.The rise of friction loss coefficient is the second largest next to exhausted loss coefficient at the heat source temperature of below 130℃.The drop of the heat source temperature leads to the efficiency decline.Compared with the turbine relative internal efficiency,the ideal cycle thermal efficiency has a greater impact on the system thermal efficiency.

关 键 词：有机工质朗肯循环 向心透平 变工况 系统热力性能 重构过程法 

分 类 号：TK14[动力工程及工程热物理—热能工程]