ACOUSTIC CLEANING

	REDUCE/ELIMINATE PARTICULATE DEPOSITS ON THE FIRESIDE OF HEAT TRANSFER TUBING
	ELIMINATE UNSCHEDULED PLANT SHUT DOWNS
	ELIMINATE TUBING CORROSION CAUSED BY PRECIPITATING DEPOSITS OF AMMONIUM BISULFATE AND BISULFITE (ABS)

PES offers fireside tube cleaning technology based on the application of acoustics.  We use the simple term cleaning but the technology is prevention of deposits, rather than cleaning after the deposits have taken place.

In the steam generating area, the Acoustic Cleaning technology is applicable too:

	Boiler evaporator and superheater tubing
	Air heaters
	Economizers
	Flue gas handling equipment - multiclones, baghouses, electrostatic precipitators
	Thermal oil heaters

Acoustic cleaning maintains the fireside of heat transfer surfaces free of deposits thereby assuring the highest heat transfer efficiency of the system.  Rotary sootblowers clean only those surfaces that are in the line of view of the steam nozzles and require the use of valuable steam for operation .

Cleaning with acoustics has several significant benefits over traditional cleaning equipment (sootblowers):

	Sound waves work on the flue gas and on tubes/heat transfer elements
	The sound energy keeps ash entrained and can also remove existing deposits
	No tube or heating element erosion
	Sound waves can effectively cover large volumes compared to sootblowers.
	Sound waves are omni-directional at low enough frequencies – sound generators located at the right place, which is mathematically modeled, covers the volume of entire equipment.

PES has applied acoustic technology to cleaning of the fireside heat transfer surfaces in one 130,000 lb/hr superheated steam boiler and one 300,000 lb/hr heat recovery steam generator with an SCR NOx reduction system.

Comparison of the work of a low frequency, acoustic cleaning system with steam sootblower

For cleaning of flue gas handling equipment – multiclones, bag houses, electrostatic precipitators we apply acoustic generators working in the range of 75 – 230 Hz. For instance, we have applied four 75 Hz sound generators (“fog horns”) in one 52,000 cfm electrostatic precipitator initially for improving the rapping cycle; since installation of the sound generators the standard rappers have not been used. Other proven applications include multiclone hoppers (to eliminate bridging) and other chute and hopper type applications.

ACOUSTIC CLEANING QUESTIONNAIRE

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Precision Energy Services
PO Box 1004
8152 Wayne Boulevard
Hayden, Idaho 83835
Phone:  (208) 772-4457     Fax:  (208) 762-1113

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