气液相变换热过程中界面腐蚀的基础研究进展

Basic research progress of interface corrosion in gas-liquid phase transformation heat process

由于两相之间会不断转换,相变换热被称为复杂的传热传质过程,其过程中会引起相变腐蚀,如冷凝液滴腐蚀、气泡腐蚀以及多相流流动腐蚀等。目前对于气液相变腐蚀的研究集中在对腐蚀产物的表征、分析,忽略了相变过程中由于能量传递引起的界面变化对腐蚀的影响。本文从相变腐蚀机理、腐蚀防护两方面出发,系统地总结管道内外冷凝液滴腐蚀、气泡腐蚀与多相流流动腐蚀等气液相变腐蚀领域的研究进展,并对其中存在的问题进行总结,同时归纳了用于研究相变腐蚀过程的腐蚀预测模型,分析其应用场合以及各种模型的优势与不足,以期为研究气液相变腐蚀监测与控制的学者提供参考,并指出气液相变换热过程中的气液两相界面腐蚀问题是未来相变腐蚀研究的重要方向。

Phase change heat transfer is a complex process for the gas-liquid phase transition. This process will trigger the phase change corrosion such as condensate-droplet corrosion, bubble corrosion and multiphase flow corrosion. Almost present researches focused on the vapor-liquid phase change corrosion are carried out mainly through characterizing the corrosion products without consideration of the effect of latent heat variation and interface change on the corrosion during the phase change process. In this paper, the study on vapor-liquid phase change corrosion was systematically reviewed in terms of the mechanism of phase-change corrosion and the corrosion protection firstly to summarize the existing problems. Secondly, the corrosion prediction models were outlined with the differences of application conditions, advantages and disadvantages, in order to provide a reference or principle for corrosion determination and further control. Finally, it was pointed out that the problem of interface corrosion in the phase change heat exchange process was the hot spot of the future research.