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空分装置中主冷凝蒸发器的自由液面常发生波动，不利于空分装置的可靠运行．为了解这种变工况下换热器传热性能的变化情况，文中研究了不同间隙尺寸下，浸没深度对弦月形狭缝微膜蒸发通道内液氮的热虹吸沸腾换热特性的影响，并设计了一种补液措施．研究结果表明，通道内流体流量随浸没度变化而变化，并进而影响其换热性能．浸没度小于１．０时，通道传热性能明显下降，但采取补液措施后，明显提高了通道沸腾换热的临界热负荷，增强了通道对自由液面波动的适应性．
Air separation plant in the main condensing evaporator free surface fluctuations occur, is not conducive to the reliable operation of air separation plant. In order to understand the variation of the heat transfer performance of the heat exchanger under varying working conditions, the effect of immersion depth on the thermosyphon boiling heat transfer characteristics of liquid nitrogen in the vapor-liquid channel of a crescent-shaped slit was studied under different gap sizes , And designed a rehydration measures. The results show that the fluid flow in the channel changes with the degree of immersion and thus affects the heat transfer performance. When the degree of immersion is less than 1.0, the heat transfer performance of the channel is obviously decreased. However, after the rehydration method is adopted, the critical heat load of channel boiling heat transfer is obviously increased and the adaptability of the channel to the free surface fluctuation is enhanced.