MJTR主热交换器清洗时间的估算
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摘要
主热交换器是岷江试验堆(MJTR)的关键部件之一,其换热能力决定MJTR能否安全运行,为保证其换热能力,换热器运行一段时间后需要清洗。本文介绍了在已知主热交换器总传热系数,一次水、二次水的出、入口水温等条件下,通过对对数平均温差、换热面积的估算,并结合二次水出、入口压差,判得出主热交换器二次侧压差大于或等于35.15 kPa时,主热交换器换热性能已有所下降,应对主热交换器进行清洗的结论。
Primary heat exchanger is the main equipment of MJTR. As the heat transfer capacity is the main factor that affect the safety of the reactor operation, the heat exchanger need to be cleared after some time of operation. In this paper, for the total heat exchange coefficient of MJTR primary heat exchanger, the inlet and outlet water temperature of the primary and secondary cooling system are known, through calculating the logarithmic average temperature margin, heat exchange area and considering the pressure margin of the secondary cooling system, it is shown that when the differential pressure of the second side is greater than or equal to 35.15 kPa, the ability of the primary heat exchanger has descended, and the primary heat exchanger should be cleaned.
Primary heat exchanger is the main equipment of MJTR. As the heat transfer capacity is the main factor that affect the safety of the reactor operation, the heat exchanger need to be cleared after some time of operation. In this paper, for the total heat exchange coefficient of MJTR primary heat exchanger, the inlet and outlet water temperature of the primary and secondary cooling system are known, through calculating the logarithmic average temperature margin, heat exchange area and considering the pressure margin of the secondary cooling system, it is shown that when the differential pressure of the second side is greater than or equal to 35.15 kPa, the ability of the primary heat exchanger has descended, and the primary heat exchanger should be cleaned.
引文
[1]杨世铭,陶文铨.传热学[M].北京:高等教育出版社,1998.