Why does the temperature of the feed plate in the distillation tower keep rising?
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I don’t know why, but in one of our distillation columns, while the temperature of the sensitive tray remains relatively stable, the temperature of the feed tray keeps rising from time to time. Sometimes adding some reflux helps to bring it down, but other times it doesn’t work at all; in fact, the more reflux is used, the higher the temperature becomes. I would appreciate it if experts could offer some guidance.
Bro, there’s something wrong with your operation parameters – who gave you those parameters? Is it unreasonable?
Perhaps there is an issue with your feed temperature, as well as with other parameters of yours. Your control parameters can only ensure stability at the beginning; they cannot maintain that stability over time, which indicates that equilibrium has not been achieved at all
One possibility is that the liquid level at the bottom of the tower is too low； One possibility is excessive heating at the bottom of the tower ； One possible cause is a leak in the feed heater for the raw materials. One possibility is that steam or hot oil has entered the feed pipe.
Reply to 5# Canghai Yishengxiao: Its feed temperature is around 40 degrees; it can be said to be a cold-feed process
Problems with the liquid distributor at the feed location can also lead to this situation.
Which tower are you referring to, OP? Have you checked for fluctuations in the feed temperature and feed volume in this situation?
When the temperature rises, it indicates that the material below has indeed moved upward. By increasing the reflux pressure and then reducing the heating amount, things will get better after a while
How does the tower top temperature fluctuate? Is the top condenser not working? All of these need to be taken into consideration: is the heat supply at the bottom of the tower too high? Is the material level at the bottom of the tower stable?
Are there large fluctuations in the feed rate and feed temperature?
We have the same problem. Is the condenser at the top of your unit a partial condenser? Is the reflux method natural reflux or forced reflux?