Determination of the feed pressure for the distillation tower
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I would like to ask the experts here: the pressure before the feed flow control valve of the distillation tower is 0.5 MPAG, and the normal flow rate to be controlled is 150 T/H. The pressure at the top of the distillation tower is 11 KPA. How can we determine the feed pressure? Thank you!
What’s the use of calculating the feed pressure?
Calculated based on the length of the pipeline behind the valve and the number of straight pipe fittings
There should be a drain near the feed line at the tower body; install a pressure gauge to monitor it, as the pressure will vary depending on the flow rate. There’s no point in measuring these data, right?
There’s no point in measuring these data, right?
What use is feed pressure to you? The operating pressure of the distillation column is not regulated by feed pressure. To prevent high feed pressure from damaging the tower, a anti-backflow baffle is usually installed at the feed inlet. Once the material enters the tower, there is basically no pressure left, just like a small river flowing into the ocean.
Knowing the pressure behind the control valve, it is possible to calculate the temperature after pressure-reducing flashing. It is intended to test the effect of different feed temperatures on the separation efficiency of the distillation column, as well as their impact on the load of the reboiler and condenser.
The pressure loss should be calculated based on the equivalent length; it is not possible to determine the backpressure after the control valve reduces the pressure
Thank you. There is an air cooler in front of our control valve, which allows the feed temperature to the distillation tower to be adjusted. We want to test the effect of different feed temperatures on the distillation process. Since there is no thermometer behind the control valve at the moment, we need to calculate it instead.