Discussion on the main cooling and drying evaporation phenomena and their causes
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What is main cold dry evaporation? Let’s discuss this issue.
“\"Dry evaporation\" and \"dead-end boiling\" occur mainly because blocking components (such as perlite and nitrous oxide) obstruct the oxygen channels, resulting in a decrease or even a complete cessation of the circulation rate. This in turn leads to the accumulation of hydrocarbons, which can cause combustion and explosion accidents. There have been numerous cases of combustion explosions in the main cooler caused by nitrous oxide. Meanwhile, research reports from Air Liquide and Linde indicate that the design of the liquid oxygen circulation rate in the falling film main cooler is too low, leading to easy \"dry evaporation\". In contrast, traditional fully submersion main coolers require full submersion operation to maintain an oxygen output of 1% in the form of liquid oxygen emissions.
Thank you for the data provided by the person above; I’ve learned something from it
Thank you for the data provided by the person above; I’ve learned something from it
Thank you for the data provided by the person above; I’ve learned something from it
This post was last edited by Ameba on 2015-12-8 at 11:10. Here’s my personal understanding: First, dry evaporation – literally, it occurs when there is no liquid present; thus, it refers to a situation where the liquid oxygen level in the main cooler is too low. I’ve worked with fully submersed systems, and a low liquid level reduces the heat exchange area of the main cooler. This in turn leads to a decrease in the reflux liquid flowing downward, as well as a reduction in the reflux liquid flowing upward. Eventually, this creates a vicious cycle that results in an even lower liquid level, i.e., dry evaporation. Moreover, a low liquid level allows hydrocarbons to accumulate, increasing the risk of explosions and other hazards. That’s my personal view