Distillation column control
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The current control scheme for the distillation tower is to control the plate temperature via the heat source at the tower bottom. Backflow flow control. Bottom extraction controls the bottom of tower liquid level, while top extraction controls the reflux tank liquid level. 1. I would like to ask everyone: when the feed composition becomes heavier, how does the temperature of the sensitive plate change? And after adjusting the heat source at the bottom of the tower, does the amount of steam rising inside the tower increase or decrease? 2. When the feed composition temporarily becomes heavier as the main disturbance, which is better: the reflux feed ratio or the reflux recovery ratio? :Q
1. If the proportion of Reorganization components in the feed increases, the temperature at the bottom of the tower will rise at a constant distillation pressure. The rising steam inside the tower will decrease
Different temperatures on the sensitivity plate correspond to different components within the tower. When the composition of the feed increases in density, the composition at the sensitivity plate also becomes denser, resulting in a higher temperature. Once the distillation tower is adjusted properly, this increase in temperature will be reduced； When the feed composition becomes heavier, it still seems that a reflux feed ratio is better. Answer provided by a non-professional; please advise, experts
1. It has switched to automatic mode, and the temperature of the sensitivity plate remains unchanged. The rising steam decreases, the reflux remains unchanged, so the recovery decreases. 2. A reflux feed ratio results in better quality.
When the feed components become heavier, if it is possible to adjust the feed inlet, it can be moved downward； Additionally, if the proportion of heavy components in the feed increases, it is necessary to adjust the heat source – its intensity must be increased. If it is not possible to increase the heat source, then the only option is to adjust the feed volume by reducing it in order to re-establish equilibrium.
Is there any difference between twin-tower series connection and single-tower reflux adjustment?
1. As the feed components become heavier, the temperature of the sensitive plate rises; after making adjustments to the heating, by controlling the temperature of the sensitive plate, the amount of steam generated decreases；
2. The reflux ratio in any distillation column is the most important parameter for ensuring separation and quality; it needs to be kept within the design operating range. If the feed composition increases, maintain or increase the reflux ratio, reduce the amount of steam rising, ensure the temperature of the sensitive plate, and increase the draw from the bottom of the tower!
As the amount of Reorganization components in the fruit raw material increases, the temperature at the bottom of the tower rises under constant distillation pressure. The rising steam inside the tower will decrease
When the two towers are connected in series, the reflux can also be kept at a single automatic level or in a ratio with the feed rate