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| Pictures
of Purge Blower in the ESP |
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Purge blowers pressurize
the insulator compartments, or penthouses, to maintain the cleanliness of
the housed components. Uninterrupted
purge blower operation is critical to precipitator systems that operate
under positive pressure. They
are frequently used, and often recommended, for ESP systems that operate
under negative draft to prevent contamination during startup and shutdown
conditions when pressure fluctuations occur.
Most negative draft systems that do not utilize a blower system
have purge openings and rely on the negative draft to purge the
compartments. Most systems
incorporate some type of heating, either insulator band or ring heaters
and/or heaters integral to the blower to limit condensation contamination
and prevent thermal shock of the insulators.
Failure of the purge and/or heating system is a major cause of
insulator failure.
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The purge / heater system ABOVE is on an
ESP system that operates at positive pressure.
Contamination BELOW indicates the blower was off-line at some
time. This unit suffered
widespread support insulator failure. |
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The through
bushing, located where the TR bus duct penetrates the insulator
compartment, is heavily contaminated.
Condensation was occurring due to air flow through a leaking
gasket, lack of bus duct insulation and purge blower failure.
The condensation was dripping onto, and contaminating, the
support insulator located directly beneath.
Through bushing and support insulator failure was widespread
in this unit.
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The installation of a deflector underneath
the purge opening to the insulator or penthouse ABOVE can help
distribute air flow to prevent corrosion of the ESP hot roof and/or
contamination of any insulator located directly beneath.
BELOW: Insulator
compartment filled with ash due to ineffective purge system. |
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