Chang Si Line
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What is the role of the three intermediate cooling reflux streams from the atmospheric four-line system to the vacuum tower in constant pressure and reduced pressure processes?
Avoid entering the furnace to reduce the load on the vacuum furnace
Flushing effect, to separate the four-line light components from the reduced pressure
Four wires in series, with pressure reduction for separation? ? ? ?
First, it reduces the load on the vacuum furnace; second, it supplies over-vented fuel oil to the vacuum tower to prevent dry plates in the lower section
The original design for the atmospheric distillation column here included three side streams plus a stream of vaporized oil (it was stated in the design that the vaporization rate had been taken into account); later, in order to reduce the load on the furnace, a fourth side stream was added, and the stream of vaporized oil was removed
Increasing the temperature of the reduced three-way reflux allows for the recovery of the light components in normal tetra
By feeding vaporized oil for vacuum distillation, the yield of wax oil is increased; this is mainly done to reduce the load on the vacuum distillation furnace. Everything that needs to be said has already been covered.