The issue of continuous nitrogen supply to the distillation tower
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The reformed depentane oil is fed into the deheptane column; during operation of this column, nitrogen must be continuously supplied at a low flow rate to maintain the operating pressure, otherwise it will drop. Question 1: Where does the nitrogen added to the tower go? Question 2: Can the tower pressure be maintained by adjusting reboiling and reflux?
It could be due to the venting of the reflux tank or a minor leak somewhere else. One of our methanol tanks had the same problem: the spool of the pressure relief control valve was leaking, and nitrogen needed to be continuously supplied to maintain the nitrogen seal pressure
Equipment and valves that cause leaks are excluded; additionally, increasing the temperature at the bottom of the tower can raise the pressure, but reflux has little impact