What does a reboiler look like once it reaches film boiling?
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Boiling is generally divided into nucleate boiling and film boiling. When the heat flux exceeds a critical value, heat transfer deteriorates, and boiling changes from the efficient nucleate boiling to the less efficient film boiling. When selecting a design, if the heat transfer temperature difference is large, boiling will occur entirely in a film boiling regime, resulting in a very low heat transfer coefficient; therefore, the equipment needs to be designed to be larger in order to ensure adequate heat exchange performance. But sometimes it is near the critical value, and the equipment margin cannot be calculated accurately. I wonder if anyone has encountered reboilers experiencing film boiling or reboilers operating near the critical state in actual production processes, and whether such reboilers exhibit any differences in behavior Will the equipment’s lifespan be shortened?
I’d like to ask: Has anyone come across reboilers where the temperature difference between hot and cold streams is 100–200°C or more? How long is the typical service life of such reboilers?
When in film boiling, the heat transfer efficiency **decreases, which is not favorable for heat transfer; it is necessary to keep the boiling in the nucleate boiling range**