Control methods for the dry point of the atmospheric and vacuum side streams
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1. Are there any differences in the control of dry points on the atmospheric and reduced-pressure side streams? 2. What methods are generally used for internal control to regulate the dry point of a certain side stream? For example, in a vacuum distillation column with four side lines, the scheduling requirement is to reduce the dry point from 367–373 to 347–353. Could you explain this using this example? 3. If it is an upward adjustment, is it completely the opposite of the downward adjustment method? I hope those of you who have come here will kindly share your insights{:2_41:}{:2_43:}{:2_41:}
The dry point is primarily controlled by the side-line distillation temperature; reducing the temperature in the first reduction stage can increase the reflux in the middle section of that stage
Reduce the dry point of a certain side stream by adjusting to increase the heat removal from the reflux at the lower part of that side stream (usually by increasing the reflux flow rate or the temperature difference between the extracted stream and the tower), while reducing the heat removal from the reflux at the upper part.