Ethylene process, propylene refrigeration assistance needed
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As shown in the figure below, the inlet side of the plate heat exchanger contains gaseous propylene, which is used as the heating source for the demethanization tower, while the outlet side contains liquid propylene. I would like to ask what are the main considerations in the design of the vertical pipe on the propylene outlet side?
Ensure adequate heat exchange; outlet standpipe; constant liquid level; ensure that the liquid phase can be discharged at all times
I’ve seen some recent designs for steam condensate that use a pipe of this kind, eliminating the need for a condensate tank
It is ensured that a phase change occurs within the plate exchanger, utilizing the latent heat. One question: is this liquid level controlled by a high-level interlock or a low-level interlock?
It’s simply to facilitate level measurement; it cannot be installed on the equipment itself – you’ll understand if you go to the site and take a look. And if you look closely at the PID, it also indicates how many mm below the bottom of the device it is