It is analyzed that the pressure at the top of the tower is higher than the pressure at the bottom of the tower
Thread Content
As shown in the diagram, the designed capacity of the hydrochloric acid stripping tower is 25 m3/h. After performing maintenance on the reboiler, it was found that when the feed flow rate exceeded 16 m3/h, the pressure at the top of the tower gradually increased compared to the pressure at the bottom, while the temperature at the top of the tower began to drop (normally around 100°C). As a result, the concentration of hydrochloric acid after stripping became too high. The packing was replaced recently; at low load, the pressure difference across the tower is around 3 kPa, so it’s likely not a problem with the packing. Let’s take a look at what factors could cause this phenomenon A normal parsing tower!
The pressure at the top of a distillation tower is usually higher than that at the bottom due to the pressure losses and gravitational effects that occur during the flow of liquid and gas within the tower. At the bottom of the tower, the static pressure of the liquid is high; as the liquid moves upward, factors such as gravity and fluid friction cause the pressure to decrease gradually. Therefore, the pressure at the top of the analyzer is relatively high. .
I really enjoy helping people solve problems. Please measure the concentration of the acid entering – is it higher than before?
The normal state of a tower is that the pressure at the top of the tower is low!
The feed concentration is the same. All around 31%!
Is something evaporating to form vapor pressure?
This tower has no reflux; the heat exchanger at the bottom is used for heat exchange between the feed and the liquid taken out from the tower bottom, and it is not a reboiler. I can’t understand thermal equilibrium. It is speculated that under special conditions, due to the absence of backflow carrying in cold energy, the rising steam cools down and its pressure decreases as it passes through the feed
Check the installation of the pressure gauge at the site to see if there is any liquid accumulation.
This post was last edited by onehai on 2024-5-13 at 16:42. 1. There is a problem with the filler installation. 2. Issues with the bottom discharge heat exchanger. It is obvious that the temperature in the middle of the tower is also very low.