Selection of control valve for degassing (desorption) mode
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Hello everyone, RT. I’m not sure how to calculate or handle the selection of control valves for desorption gas. I’d like to ask for advice here. During the operation of the plant, there may be various types of wash towers, absorption towers, etc.; within these systems, liquids absorb a certain amount of gas under specific conditions, and when a pressure drop is created by control valves, a certain amount of gas will be released. This is different from cavitation flashing, in which both the liquid phase and the gas phase are of the same substance but in different phases. Desorbing gases and liquids generally belong to different categories of substances. How should the selection of control valves be handled in such a situation?
This is flash vaporization: due to an excessive pressure difference, the gases dissolved in the liquid escape and form bubbles. As the pressure increases after passing through the valve seat, these bubbles burst, a phenomenon known as cavitation. The selection should be based on considerations related to flash vaporization and cavitation
Desorption and cavitation are two different operating conditions~Cavitation calculation requires a critical pressure ratio, but desorption clearly has nothing to do with the critical pressure ratio