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Pictures of Purge Blower in the ESP Back to

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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Last updated: May 27, 2011.
Copyright 1997 TRK Engineering Services, Inc. All rights reserved.
For more information contact: TRK Engineering Services - 95 Clarks Farm Road - Carlisle, MA 01741 - Telephone: 978-287-0550 - Fax: 978-287-0569 - email: trkeng@apcnetwork.com