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of Air Inleakage in the ESP
Air / water inleakage can have a drastic adverse affect on
precipitator operation. When
outside air / water is drawn into the precipitator system, gas volume, gas
velocities, gas temperature and moisture content of the gas is affected
which can modify resistivity and reduce treatment time.
Additionally, inleakage promotes corrosion and can cause
reentrainment of collected material. Sources
of air inleakage are often ignored as insignificant, however, their
cumulative affect can be great. Below
are examples of typical Sources of inleakage.
ash patterns on the inside of this hopper door indicate air
inleakage. Air inleakage
in the hopper area can cause reentrainment of collected material as
well as corrosion of overhead collecting plates.
in a side access door coaming allow outside air to penetrate the
ESP, causing zones of high velocity and corrosion of internal
collecting plate shown in this photo is adjacent to a leaking side
access door. Air
inleakage has destroyed the lower portion of the collecting plate.
The resulting jagged edges will promote spark-over and lead
to the eventual failure of adjacent electrodes.
||Corrosion of inner
surface of access door due to air inleakage.
air inleakage in the hopper area is crucial to reducing corrosion,
and to preventing reentrainment of collected material and hopper
Note evidence of air inleakage at the hopper flange.
handling systems (screw conveyor) are often sources of air
rotary valve blades allow adjustment to obtain a seal, this valve is
worn along the edge and allowing air inleakage.
||Both double dump valves
are propped open. This
may temporarily help material flow, but the resulting air
infiltration can cause hopper buildups, corrosion and dust
||The open test post in the
inlet duct is a source of inleakage.
rapper boot seals and pipe sleeves as sources of inleakage.
||The insulation was
removed from the precipitator inlet ductwork to expose large
corrosion holes over the entire length of duct.
These holes allowed for significant inleakage.
ESP performance would vary with temperature and
|Slide gates can be a
source of inleakage. Seals
should be inspected and replaced if evidence indicates inleakage
integrity of expansion joints and repair or replace as necessary to
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