The flat blade system consists of two parallel blades of mist
eliminator and three layers of flushing water pipe. The first layer
removes coarse particle fog drops, and the second layer removes
fine particle fog drops. Critical separation size of flat plate
mist eliminator : 28 to 40 um, 40 mm for first degree, 30 mm for
Flushing system including: nozzle, pipeline and pipe clamp, etc.
Water pipe of mist eliminator is made by anti-corrosive carbon
steel or stainless steel. The dimension of nozzle is 316L. The
layout form of flushing pipe is the top and bottom side of the
first-degree mist eliminator and bottom side of the second-degree
mist eliminator. 200% flushing water spray overlap rate ensures
demister run with low resistance.
Flue gas separates droplets away under the action of inertia force
and gravity when passing bending channel of the mist eliminator.
Then desulfurized flue gas flows through mist eliminator in a
certain speed and changes running direction quickly and
continuously. Droplets in the flue gas are captured while crashing
into mist eliminator blades under the action of centrifugal force
and inertial force. They gather and form into a stream and then
drop back to the slurry pool under gravity. Finally gas and liquid
are separated, and the flue gas which flows through mist eliminator
is discharged after meeting the standard of mist removal. Demisting
efficiency of mist eliminator increases as the air velocity gets
higher. The high flow velocity and the large inertia force acting
on the droplets are conducive to the separation of gas and liquid.
However, flow velocity improvement will increase system resistance
and energy consumption. The increase of flow velocity has certain
limits, because over-high flow velocity will bring water. It may
reduce demisting efficiency. The highest flow velocity of flue gas
with no secondary water when passing through the cross-section of
mist eliminator is always defined as the critical flow velocity.
The velocity has relation with the structure of mist eliminator,
the water load of system, flow direction, arrangement form of mist
eliminator and other factors. Flow rate is always selected between
3.5~ 5.5 m/s.
|Materials of mist eliminator||FRPP||Stainless steel||Fiberglass|
|Baffle plate thickness of mist eliminator||mm||3mm||Set by Customer Requirements||Around 2.3mm|
|Form||Horizontal Type ( Plate Type ), Herringbone Type ( Weir Type ), V
Type , Combined Type. etc.|
|Area of Mist Eliminator||㎡||The inner diameter of the desulfurization tower area or
cross-sectional area of flue|
|Flow velocity of air tower in mist eliminator||m/s||Plate Type 3-4m/s,Weir Type 2.5-5.5 m/s|
|Degree of Mist Eliminator||degree||Two degrees|
|Interval and height between baffle plates of mist eliminator||Designed by different desulphurization craft|
|Flushing layers of flushing system||layer||Upper and bottom of first-degree mist eliminator, bottom of
second-degree mist eliminator; Configurable and topper layer of
some mist eliminator be flushed in hand|
|Amount of droplets discharged by mist eliminator||mg/m³||≤75mg/Nm³|