多目标优化的双级回热循环与跨临界CO_2热泵耦合系统研究  

Study of a Multiobjective Optimized Dual-stage Recuperative Cycle System Coupled With a Transcritical CO_2 Heat Pump

作　　者：王洪利[1] 唐琦龙 贾宁[1] 

机构地区：[1]河北联合大学冶金与能源学院,河北唐山063009

出　　处：《热能动力工程》2014年第2期151-155,216,共5页Journal of Engineering for Thermal Energy and Power

基　　金：河北联合大学基金资助项目(SP201306)

摘　　要：为提高电厂双级回热循环效率,建立了双级回热朗肯循环(DSRRC)和跨临界CO2热泵(TCHP)耦合循环(DSRRC+TCHP)模型并进行了性能分析。研究表明:给定条件下,DSRRC+TCHP最优排气压力8.33 MPa,DSRRC+TCHP效率0.397 6,热泵性能系数4.217,系统采用DSRRC+TCHP最大效率提高0.43%。建立了多目标优化数学模型,获得了DSRRC+TCHP和DSRRC系统的评价函数。当温度达到722℃时,DSRRC+TCHP和DSRRC系统的评价函数最大值分别为0.005 3和0.004 51。To enhance the efficiency of a dual-stage recuperative cycle in a power plant,established was a model for a dualstage recuperative Rankine cycle( DSRRC) coupled with a transcritical CO2heat pump( TCHP) and conducted also was an analysis of its performance. The research results show that under the given condition,DSRRC + TCHP have an optimum exhaust gas pressure of 8. 33 MPa and an efficiency of 39. 76% with the performance coefficient of the heat pump being 4. 217. When the system adopts DSRRC + TCHP,the maximum efficiency can increase by0. 43%. Furthermore,the authors have established a multi-objective optimization mathematical model and obtained a function for evaluating the DSRRC + TCHP and DSRRC system. When the temperature reaches 722 ℃,the maximum values of the DSRRC + TCHP and DSRRC system obtained by using the evaluation function are 0. 0053 and0. 00451 respectively. The foregoing can offer a theoretical basis for enhancing the performance of power plants.

关 键 词：双级回热 跨临界CO2热泵 耦合循环 评价函数 多目标优化 

分 类 号：TM621.3[电气工程—电力系统及自动化]