Why do some fractionation towers require gas injection while others need venting?
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For reformation fractionators, why is it necessary to add gas to the reflux tank in some cases? Do some need to go to low wattage (dump)? I know it’s to maintain the pressure in the tower; so what causes the tower pressure to be high or low? I’m a complete beginner; could everyone please explain what’s going on?
When the tower pressure is low, air is added to it; when the pressure is high, air is released to maintain stable tower pressure
I understand this. My question is why does the tower pressure drop or rise?
Maintaining a constant tower pressure is to ensure operational stability. So, if it’s too low, pressure needs to be added; if it’s too high, pressure needs to be released. An increase in light components raises the tower pressure, while a decrease in light components lowers it!