Why is the pressure in the absorption tower and the stripping tower controlled at around 1 MPa?
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Why is the tower pressure controlled at around 1 MPa when using a stripping tower to separate the C2 and C3 components of condensed oil?
The absorption liquid in the absorption tower is made up of stabilized gasoline and crude gasoline, which are used to absorb the gaseous components in the condensate oil tank
This is mainly because the desorbed gas has to be sent to the absorption tower for re-absorption, resulting in an infinite cycle of absorption and desorption. Theoretically, high temperature and low pressure are favorable for desorption, but in practice the pressure in the desorption tower is higher than that in the absorption tower. Furthermore, the level of pressure in the absorption/desorption system mainly depends on the capacity of the rich gas compressor.
This should be determined by the pressure at the liquefied gas outlet device (the pressure in the tank used for storing and transporting liquefied gas determines the outlet device pressure); after that, the absorption stabilization pressure is determined, and finally it is decided what outlet pressure the compressor should have. It’s purely my own understanding; I’ve never seen this explanation elsewhere, but I think my understanding is correct, hehe