压力对超临界二氧化碳布雷顿循环系统的影响  

Influence of pressure on the thermal performance of the S-CO_2 Brayton cycle

作　　者：梁墩煌 张尧立[1] 赵英汝[1] 房超[2] 郭奇勋[1] 洪钢[1] 

机构地区：[1]厦门大学能源学院,福建厦门361102 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《哈尔滨工程大学学报》2017年第4期578-582,共5页Journal of Harbin Engineering University

基　　金：教育部重点实验室开发基金项目(ARES201402)

摘　　要：为了研究S-CO_2布雷顿循环中工作温度、压力以及换热器的换热能力对系统的热效率的影响。通过计算机数值模拟的方法,建立了S-CO_2闭式再压缩布雷顿循环的热力模型。在换热器换热能力一定的条件下,通过调整压缩机出口压力、压比以及换热器压降等参数,研究系统循环最大热效率的变化。计算结果表明,压缩机出口压力以及压比均存在最优值,当压力超过一定数值后,增大系统压力并不能提高热效率。换热器的压降对系统热效率影响显著,并影响系统最大热效率情况下的再压缩份额。To study the effects of the working temperatures and pressures, and heat exchanger （ HX ） charac-teristics on the thermal efficiency of the cycle, an S- CO2 recompression closed cycle model w as established u-sing numerical simulation. By adjusting the outlet pressure of the compressor,and the pressure ratio and pres-sure loss inside the HXs, the maximum thermal efficiency of the S- CO2 Brayton cycle wa s studied. Results show that both pressure and pressure ratio have an optimal value. When the pressure exceeds a certain value, the thermal efficiency of the cycle cannot be improved by further pressure enhancement. Pressure loss signifi - cantly affects the thermal efficiency of the cycle and, at the same time, affects the re-compression ratio of the cycle for maximum thermal efficiency.

关 键 词：超临界二氧化碳 四代堆 布雷顿循环 再压缩 热效率 压力 压比 压降 换热器 

分 类 号：TL343[核科学技术—核技术及应用]