Preheat control for a fractional distillation process

Details Preheat control for a fractional distillation process Preheat control for a fractional distillation process

1986-07-07

1988-03-15

Sneed, Helen M. S.

Mineral oils: processes and products

Fractionation

Distillation

208DIG1, 208160, 203 1, 202160, B01D 342

Patent

active

047311754

ABSTRACT:
A computer control system for automatically optimizing the temperature of the feed supplied to a distillation column from a fuel fired preheat furnace, wherein the furnace temperature is manipulated in response to a measured ratio of distillate flow (D) from the tower to fuel flow (F) to the furnace. The D/F ratio is maximized by periodically comparing the present value of D/F to the previous value and incrementally increasing the furnace temperature as long as the D/F ratio increases. When no change is detected or the D/F ratio starts to decrease the furnace temperature is incrementally decreased until the D/F ratio again increases and reverses the control action once more.

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Application Ser. No. 589,364--Filed Mar. 14, 1984--Hofferber.

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