Issues with the equipment conditions for urea double distillation
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Some sources state that the flow velocity of the medium in the heat exchanger for urea double vaporization must be subsonic; I’ve always found it difficult to understand this. I would appreciate it if experts could explain the theoretical knowledge or basic principles related to this topic. Thank you all.
The speed is indeed fast; it’s probably supersonic
It’s not subsonic; it’s supersonic.
At low speeds, a thicker liquid film forms on the tube wall due to the urea solution, which hinders evaporation; moreover, the retention time increases, leading to an increased formation of the side reaction product, biuret. Personal opinion
What factors should be considered when manufacturing heat exchangers? Dear friends, please share your valuable suggestions. Thank you!