Relationship between distillation column pressure and the cooling efficiency of wet air cooling
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May I ask, is cooling more effective using air cooling at high tower pressure in a distillation column, or at low tower pressure?
It’s best to clarify this issue; you should know the question yourself, and it’s also necessary that the participants understand what you’re saying. For example, what kind of device or apparatus it is; it would be best to include a simple diagram to facilitate discussion.
The pressure difference in a distillation tower is related to the permeability of the packing or trays, as well as the volume of gas inside the tower; it has no direct connection with the efficiency of the air-cooling tower at the top of the tower. The efficiency of the air-cooling tower only affects the pressure at the top of the tower, which in turn influences the temperature at the bottom of the tower, but it has no effect on the pressure difference across the packing
What I mean is, is there any relationship between the pressure at the top of the distillation column and the effectiveness of air cooling?
Can a high tower pressure be understood as a high flow rate and high space velocity, resulting in a shorter residence time of the material inside the air cooler and thus a poorer cooling effect? Also: Does the tower pressure level affect the inlet temperature? ?
For the same material, a higher column pressure means that the temperature of the stream exiting the top of the column and entering the air cooler is high, resulting in good air cooling efficiency. Conversely, if the temperature of the stream entering the air cooler is low, the air cooling efficiency will be poor. In engineering, it’s not the case that the higher the tower pressure, the better. It is generally appropriate to keep the temperature of the stream leaving the top of the tower and entering the air cooler between 60–80°C.