核电末级双联低加中湿蒸汽的影响及预防

Influence and Prevention of Wet Steam in the Last Stage Combined Low Pressure Heater of Nuclear Power Plant

核电末级双联低加是核电汽轮发电机组回热系统中不可或缺的辅助设备之一,它可以有效利用汽轮机低品位抽汽来加热再热器给水,并带走级间疏水,从而极大的提高了热力系统的循环效率。由于混入级间疏水,进入双联低加的蒸汽湿度很大。本文通过分析湿蒸汽的来源以及特点,研究了湿蒸汽对低压加热器的影响,提出了一些预防措施,以期使低压加热器在核电机组中运行的更安全,提高设备的利用效率。

The last stage combined low pressure heater is one of the important auxiliary equipments in nuclear turbine regenerative system.It uses the turbine extraction steam to heat the feedwater,and take away the interstage hydrophobic,thus greatly improving the thermodynamic cycle efficiency of the system.The steam,which flow into the combined LP heater,has a high humidity while mixed with the interstage hydrophobic.By analyzing the sources and characteristics of wet steam,this paper research on the influence of wet steam,and propose some preventive measures to make the operation of low pressure heater safer in nuclear power plants,improve the efficiency of the device.