弦月形狭缝沸腾换热是一种简便而有效的强化换热技术，可直接应用于中小型空分装置的列管式主冷凝蒸发器。为探寻主冷凝蒸发器在自由液面波动时换热性能的变化情况，本文在国内外首次研究了不同间隙尺寸下，浸没度对弦月形狭缝通道沸腾换热性能的影响，并设计了一种补液措施，从而明显提高了狭缝通道沸腾换热的临界热负荷，增强了对各种浸没度的适应性。 Crescent-shaped slit boiling heat transfer is a simple and effective heat transfer enhancement technology that can be directly applied to small and medium-sized air separation unit tube main condenser evaporator. In order to find out the change of heat transfer performance when the main condenser evaporates in free surface, this paper firstly studies the influence of immersion degree on the boiling heat transfer performance of the meniscus slit channel with different gap size at home and abroad, and designs A rehydration measure, which significantly improves the critical heat load of the boiling heat transfer in the slit passage, enhances the adaptability to various immersion degrees.