Reflux tank level control
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Dear sea friends, how should the liquid level in the reflux tank be controlled? Should it be adjusted by changing the reflux ratio, or should the adjustments be made in the same manner for both values?
This post was last edited by netuser on 2010-9-17 at 17:57. The reflux flow is constant, while the liquid level is controlled by the amount of discharge to the outside.
With a constant reflux ratio, the liquid level is controlled by the external extraction rate
The liquid level in the reflux tank is controlled by the amount of liquid drawn off; the reflux ratio remains constant with only minor adjustments.
The size of the reflux ratio determines the distillation efficiency within the tower; therefore, the liquid level in the reflux tank is controlled by an external control valve
As the liquid level rises, while keeping the reflux flow rate constant, the liquid level in the reflux tank is controlled by an external control valve. Increase or decrease the opening of the external control valve. The temperature of the reboiler controls the reflux flow.
What was said upstairs is ambiguous. If the reflux ratio remains constant, controlling the external discharge can help regulate the liquid level; but if the amount of external discharge changes, can the reflux ratio still remain constant? The reflux ratio is the amount of fluid returned divided by the amount of fluid extracted. Level control is not based solely on external discharge control; rather, it is achieved by adjusting the return flow rate and the amount of external discharge according to product quality. When the temperature and pressure inside the tower remain constant and the liquid level rises, it indicates a high content of the product in the feed. In such cases, the output volume can be increased while maintaining product quality. The reflux ratio will decrease. If the liquid level drops, the proportion of overhead product in the feed decreases, the composition within the tower becomes heavier, and the top temperature rises. At this point, to maintain product quality, it is necessary to increase the reflux rate and reduce the amount of product taken out, which results in an increased reflux ratio.
The liquid level in the reflux tank is generally constant, and it is controlled by an external signal
It is generally controlled by external discharge; the reflux ratio should not be adjusted casually