Weir type mist eliminator and tubular mist eliminator are decorated
in the upper part of absorption tower. The equipment contains a
layer of weir type mist eliminator and a layer of tubular mist
eliminator as well as three layers of flushing device
The mist tubular eliminator on the first layer removes coarse
particle fog drops and the weir type mist eliminator on the second
layer removes fine particle fog drops.
Flushing system including: nozzle, pipeline, pipe clamp, etc.
Water pipe of mist eliminator is made by anti-corrosive carbon
steel or stainless steel and the nozzle is made of 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. Critical separation size of weir
type mist eliminator: 15-30um for second level, 20-30um for first
The advantage of weir type mist eliminator is that the velocity of
flue gas passing through the normal of blade is smaller than the
average velocity when passing through horizontal cross-section in
tower. In this way, even if the velocity of flue gas in tower flow
is high, it decreases when passing through the mist eliminator as
the flow area increases. Weir type mist eliminator needs a
rectangular channel on the surface of the cross section in
absorption tower. However, the absorption tower is round, so part
of it requires to be sealed with blind ram to set off a part of the
edge. In addition, the structure of wire type mist eliminator is
more stable than that of flat type mist eliminator. It can stand
higher temperature, therefore, it is recommended when the
desulphurization system is not on GGH setting. The general height
of weir type mist eliminator with single beam is 2850mm while that
of two-stage plate type mist eliminator is 3230mm, namely, weir
type mist eliminator with single beam occupies little space.
However, considering decreasing the amount of water, it is usually
required that the flue gas changes flow direction and improves the
flow velocity at 1m above the blade of mist eliminator. In this
way, big particles can fall back on the mist eliminator. If adding
this 1 m of reserved space, weir type and plate type mist
eliminator occupies similar total space.
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.
|1||Haina has 20-year experience on Flue Gas Treatment Solutions that
widely used in various industries .|
|2||Large stock of devices and big-scale assembly line to satisfy any
urgent orders from customers .|
|3||Talented technical team to solve any difficult gas treatment
proposes and special orders .|
|4||Exported all over the world with rich experience on international