Reflux tank installation height
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How is the installation height determined for the reflux tanks at the top of certain towers, such as fractionation towers and stabilization towers? This post was last edited by DAC The army rules the world on 2009-1-31 11:14.]
First, is your tower operated under vacuum? Is the reflux tank connected to the vacuum system? A typical tower system has three to four platforms; the top condenser and cooler are located at the very top, while the reflux tank is situated on the second platform, above the reflux pump. The installation height between the devices must be sufficient to overcome the vacuum resistance and pipeline resistance, as well as the pump’s effective NPSH.
Under reduced pressure, if the top of the tower is used for discharging wastewater outside, the reflux tank needs to be placed at a higher level to facilitate the removal of wastewater under vacuum conditions. In other normal cases, it can be set lower to facilitate observation and maintenance
The tank had better not be too low; it should be able to reflux on its own! Based on the pipeline resistance, eliminate the resistance in the return line to ensure that the liquid can flow back to the tower smoothly! If it’s too low, the recirculation pump needs to be increased; if it’s too high, the frame has to be raised as well!
Can it be calculated and simulated using PROⅡ?
It depends on the reflux situation; if it is self-reflux, the reflux drum at the top of the tower must be at least 2 meters above the tower top； If forced recirculation is required, it is sufficient to ensure that the minimum suction height of the recirculation pump is met; in such cases, if the frame has a three-layer structure, it is generally placed on the second layer.
It should be determined based on the specific circumstances; the zero-level tank should be located at the lowest point in the entire facility, which is beneficial for the factory’s process of resetting and emptying
It seems that PRO2 is unable to calculate the height of the reflux tank; you have to set this height based on your specific process
This generally isn’t very particular either. It is usually placed two meters away from the rotating equipment`
Hydraulic calculations are performed based on the various operating conditions that may arise during the process to determine the installation height. For example, the return tank needs to discharge the separated liquid by gravity; therefore, it is necessary to calculate whether, under the system’s vacuum level, the liquid in the tank can be discharged at its installed height and whether the liquid seal height is sufficient to prevent air from entering the system ； In the case of self-reflux, the installation height must be higher than that of the inlet reflux port; specifically, it should be greater than the total pressure drop along the self-reflux pipeline ； If it is pump backflow, the pump’s net positive suction head must be satisfied, and so on.
Under normal circumstances, the installation height of the top reflux tank is on the second floor; together with the height of the tank foundation, the height of the reflux tank should be over 6 meters. The main consideration here is the allowable net positive suction head. It is also necessary to consider that the reflux tank is located lower than the tower top condenser, to ensure that the condensate can flow into the tank.
I was on a business trip these past few days; as soon as I returned, I headed to Shanghai Chuan :lol