60 MW超临界CO_2分流再压缩闭式循环热力性能优化分析
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摘要
针对60 MW超临界CO_2分流再压缩闭式循环建立数学模型,采用Matlab语言编制程序,研究各循环参数对循环效率和循环功率的影响,并对循环参数进行了优化,根据优化结果给出60 MW超临界CO_2间接加热闭式循环参数方案。结果表明:随着透平进气温度的升高,循环效率与循环功率线性升高,但由于CO_2在临界点附近的物性呈非线性变化以及低温回热器冷端端差的约束限制,分流比、透平进气压力、主压缩机进气温度与压力等参数对循环效率的影响呈现非单调变化关系。
A mathematical model was established for the 60 MW supercritical CO_2 recompression closed Brayton cycle to study the effects of various cycle parameters on the cycle efficiency and cycle power using Matlab language. The cycle parameters were then optimized, after which, optimal parameters were finally presented for the 60 MW supercritical CO_2 recompression closed Brayton cycle. Results show that the cycle efficiency and cycle power increase linearly with the rise of turbine inlet temperature; however, the cycle efficiency varies non-monotonically with the split ratio, turbine inlet pressure, and main compressor outlet temperature and pressure, due to the highly non-linear change of carbon dioxide properties near critical point and the constraints of pinch point.
A mathematical model was established for the 60 MW supercritical CO_2 recompression closed Brayton cycle to study the effects of various cycle parameters on the cycle efficiency and cycle power using Matlab language. The cycle parameters were then optimized, after which, optimal parameters were finally presented for the 60 MW supercritical CO_2 recompression closed Brayton cycle. Results show that the cycle efficiency and cycle power increase linearly with the rise of turbine inlet temperature; however, the cycle efficiency varies non-monotonically with the split ratio, turbine inlet pressure, and main compressor outlet temperature and pressure, due to the highly non-linear change of carbon dioxide properties near critical point and the constraints of pinch point.
引文
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[2] 段承杰,杨小勇,王捷.超临界二氧化碳布雷顿循环的参数优化[J].原子能科学技术,2011,45(12):1489-1494.DUAN Chengjie,YANG Xiaoyong,WANG Jie.Parameters optimization of supercritical carbon dioxide Brayton cycle[J].Atomic Energy Science and Technology,2011,45(12):1489-1494.
[3] DOSTAL V.A supercritical carbon dioxide cycle for next generation nuclear reactors[D].Cambridge:Massachusetts Institute of Technology,2004.
[4] The subcommittee on generation IV technology planning.A technology roadmap for generation IV nuclear energy systems[R].US:DOE,2002.
[5] YANG Chen.Novel cycles using carbon dioxide as working fluid[D].Stockholm,Sweden:School of Industrial Engineering and Management,2006.
[6] SARKAR J.Second law analysis of supercritical CO2 recompression Brayton cycle[J].Energy,2009,34(9):1172-1178.
[7] AKBARI A D,MAHMOUDI S M S.Thermoeconomic analysis & optimization of the combined supercritical CO2 (carbon dioxide) recompression Brayton/organic Rankine cycle[J].Energy,2014,78:501-512.
[8] MUTO Y,KATO Y.Optimal cycle scheme of direct cycle supercritical CO2 gas turbine for nuclear power generation systems[C]//CEN Kefa,CHI Yong,WANG Fei.Challenges of Power Engineering and Environment.Berlin,Germany:Springer,2017:86-92.
[9] BAE S J,LEE J,AHN Y,et al.Preliminary studies of compact Brayton cycle performance for small modular high temperature gas-cooled reactor system[J].Annals of Nuclear Energy,2015,75:11-19.
[10] BRUN K,FRIEDMAN P,DENNIS R.Fundamentals and applications of supercritical carbon dioxide (sCO2) based power cycles[M].Cambridge,UK:Woodhead Publishing,2017.