Vacuum residue after heat exchanged with feedstock oil, it enters
in to oxidation tower. As air is blowing from the bottom of
oxidation tower, vacuum residue in the tower is oxidizing reacting
with air. Fresh water is sprayed from the top of oxidation tower to
control the temperature of gaseous phase temperature not higher
than 160 c.
Tail gas from the top of oxidation tower will flow in to a
saturator, tail gas contact with water and cooled down to have the
dirty oil separated away from gas. The residual gas discharged from
the top of saturator will flow in to water sealed tank. And
residual gas discharged from the top of water sealed tank will be
sent to residual gas incinerator, which will be discharged to air
after burnt in a incinerator. The heat energy produced from tail
gas can be used for heating up of the feedstock oil before entering
in to vacuum tower.
The dirty oil discharged from saturator will flow in to residual
oil tank, and then pumped out of unit periodically. Circulating
diesel is pumped in to asphalt-diesel heat exchanger through diesel
circulating pump to make its temperature increased from 65c to
140c. The hot diesel will be cooled through diesel cooler with
circulating water to have it down to 65c. The cooled diesel will be
sent back to diesel circulating tank.
Compressed gas from the system pipe lines enters in to bottom of
Saturator, residual oil tank, diesel tank are in the same case.
The degree of asphalt from 60-120 is controlled by the vacuum
distillation extraction level, oxidation duration and air blowing