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以随时空变化的环境温度(即动态基准温度)为基准点,对国内300 MW亚临界机组、600 MW及1 000 MW超临界机组回热系统的相关值进行了计算,在此基础上利用火用效率矩阵方程对回热系统加热器的效率进行了计算,分析了动态基准温度对回热系统加热器效率变化影响:随着基准温度升高,各加热器效率均降低,而抽汽压力越低效率降低的越多,各机组8号加热器效率降低的最大;对于各机组的8号加热器,当△Tjz=20℃时,△η分别等于-37.12%(300 MW机组)、-32.6%(600 MW机组)、-20.51%(1 000 MW机组),随机组容量增大呈现出降低的趋势。这可为回热系统乃至整个机组分析的动态基准点的选择提供参考。
Based on the ambient temperature changing with time and space (ie dynamic reference temperature), the relative values of domestic 300 MW subcritical units, 600 MW and 1 000 MW supercritical heat recovery systems were calculated. Based on this, The heat efficiency matrix equation was used to calculate the efficiency of the heater in the regenerative system. The effect of the dynamic reference temperature on the efficiency of the heater in the regenerative system was analyzed. As the reference temperature increased, the efficiency of each heater decreased The lower the extraction pressure, the more the efficiency is reduced, and the maximum efficiency decreases for No. 8 heater of each unit. For No. 8 heater of each unit, △ η equals -37.12% (300 MW units), - 32.6% (600 MW units), and - 20.51% (1 000 MW units). The capacity of the randomization group showed a decreasing trend. This provides a reference for the choice of dynamic reference points for the analysis of the regenerative system and of the entire unit.