Carbon dioxide gas method
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Dear sea friends: In the carbon dioxide stripping process, there are three condensate outlet valves on the shell side of the stripping tower. Normally, the middle valve is opened; when can the other valves be used, and what are the advantages or disadvantages of using them? Please give some guidance, thank you!
Regarding this issue, I think in the case of CO2-stripped urea production, different design approaches are used by various design institutes; I have seen small units designed by one institute, as mentioned by the original poster, while those on a scale of over 300,000 tons have a condensate outlet； Additionally, the system I’m using currently is the predecessor of the CO2-stripped urea systems from the Stamicarbon series (this claim is based on an analysis of its age); it features a interface for shell-level measurement as well as a design for monitoring the liquid level in the shell ； So when the design is different, we consider this issue from a production perspective only – it is sufficient to ensure that this heat exchanger (stripper) has an effective heat exchange performance; in other words, its opening degree can be adjusted according to the process requirements to ensure proper operation of the stripper. There is no need to focus on when it should be turned on or off, or to what extent it should be opened! These are my personal opinions; I hope the original poster and my colleagues will offer their criticism and suggestions.
In simple terms, it involves adjusting the condensate level on the shell side of the stripping tower, thereby changing the heat exchange area
The answer on the 3rd floor is correct, but it’s not that strict; in most cases, all the valves are opened. There are two liquid outlet ports here, and both of those ports are also open. According to traditional practices, these ports are used to adjust the heat load – the lower port should be closed when the load is low – but these days, operations at low load levels are rare, as everyone wants to operate at high load levels to earn more money.