1. Composition and layout of distillation tower system
The distillation tower system is composed of simple distillation tower,
reboiler, condenser, reflux tank and other equipment. Generally, it is arranged
in the order of the process and as close as possible to meet the requirements of
the specification to form an independent operating system. The similar equipment
is arranged centrally, such as the condenser is generally arranged on the third
floor, and the reflux tank is arranged on the second
On the floor of the first floor, the reboiler is installed at the bottom of
the distillation tower, and the pump is arranged on the first floor. This is not
only neat and beautiful, but also easy to operate. Due to the particularity of
the reboiler, the related equipment and piping need to be carefully
designed.
Distillation Technology
2. Distillation Technology system operation
The liquid at the bottom of the tower is heated by a reboiler to partially
vaporize it. The reboiler at the bottom of the tower enters the tower and enters
the tower, and contacts the descending liquid in two-phase countercurrent. The
non-volatile components in the steam are continuously transferred to the
descending liquid
Near the top of the tower, the higher the concentration of its volatile
components, and the closer the descending liquid is to the bottom of the tower,
the richer its volatile components are, to achieve the purpose of component
separation. The vapor rising from the top of the tower enters the condenser, and
part of the condensed liquid is returned to the top of the tower as reflux
liquid, and the rest is sent out as distillate. Part of the liquid flowing out
of the bottom of the column is sent to the reboiler for heating and returned to
the column, and the other part of the liquid is recovered as the residual liquid
in the kettle.
3. Thermosiphon reboiler
(1) The principle of thermosyphon reboiler
Distillation tower
The thermosiphon reboiler uses the pressure difference between the liquid
level of the distillation column and the liquid level of the reboiler as the
power to drive the gravity circulation flow of the liquid, so that the liquid at
the bottom of the distillation column flows to the reboiler. Part of the liquid
is vaporized in the reboiler and returned to the column to achieve vapor and
liquid separation. In order to ensure the normal operation of the reboiler,
there must be a certain pressure difference to overcome the pressure drop in the
pipeline, the reboiler and the static pressure of the two phases.
(2)The installation height requirements of thermosyphon reboiler
The liquid at the bottom of the distillation column flows into the pipeline,
and the lower the pressure, the higher the pressure. If the tube where the
liquid rises is high, the pressure will be reduced to cause bubbles in the tube.
The height of the siphon effect is determined by the generation of bubbles.
(3) Special requirements for vertical thermosiphon reboiler
If the vertical thermosiphon reboiler is operated in vacuum, it is not
suitable for liquids with greater viscosity and materials with solids, and the
height of the tower skirt is also required.
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