回热器
布莱顿循环
烟气
超临界流体
气体压缩机
发电站
核工程
锅炉(水暖)
质量流量
朗肯循环
热交换器
热效率
热力学
化学
机械工程
工程类
功率(物理)
废物管理
燃烧
物理
有机化学
作者
Wang Li-min,Chang‐An Wang,Wengang Bai,Liyan Jin,Xiaohu Yang,Defu Che
摘要
Abstract The utilization of residual energy of high‐temperature flue gas at the tail of coal‐fired boilers has attracted widespread attention in recent years. The thermal performances of the boiler and system in different split‐flow layouts still need to be analyzed and compared in detail. Thermodynamic models for four different splitting layouts of supercritical carbon dioxide (S‐CO 2 ) Brayton cycles tailored for coal‐fired power plant are built and validated. By performing the process simulations, the effects of splitting ratios on the system thermal performance are comparatively analyzed when the secondary split point and the confluence point are set at different positions. The maximum system efficiency of the two‐split layout with a secondary splitting point at the inlet of the cold side of the high‐temperature recuperator (HTR) can be obtained within a range of secondary split ratio. The maximal and minimal boundaries are determined by the exhaust flue gas temperature and the heat capacity match in the recuperators, respectively. The mass flow rate of the cold stream in the low‐temperature recuperator (LTR) should be kept unchanged by constraining the sum of primary and secondary split ratios, the constant to prevent the cycle efficiency from decreasing dramatically, if the splitting layout with the split point at the outlet of the main compressor (MC) is used. The two‐splitting layout with a secondary splitting point at the inlet of the cold side of the HTR has the best performance by comparing the system efficiencies of different layouts. If there are any improved coupling approaches of the S‐CO 2 Brayton cycle and boiler, this paper can provide the reference for the selections of the split ratios.
科研通智能强力驱动
Strongly Powered by AbleSci AI