4343-A Bulletin Page 3
TWINBED II CRG
BED MEDIA REPLACEMENT Removal of existing bed material should be done as part of a regular maintenance program. However, bed material can be replaced with the furnace in operation. Typical control systems permit one burner to be shut down while the other burner fires in conventional, non-cycling mode. WARNING: Personnel should wear appropriate personal protective equipment when changing media.
North American provides a video of this procedure if required for additional guidance. Before replacing the bed material, the slide gate must be pushed back in place and secured by reversing the above procedure. To add the cleaned or new bed material, the media access cover must be first removed by removing eight nuts and bolts. To facilitate installation of the bed material, a fabricated chute (see Parts List) can be inserted through the refractory-lined opening in the regenerator. The 3⁄8 " diameter alumina balls (see Parts List) can be poured into the chute directly from 55 lb. bags or in smaller quantities from 200 lb. drums. A fill label is attached to the regenerator housing indicating the proper volume of bed material.
WARNING: Bed material must be cooled to safe temperature before opening burner.
For regenerator bed maintenance and cleaning, see Sheet 4343-4.
To remove the bed material from the non-firing burner, the slide gate located at the bottom of the air/exhaust plenum must be pulled toward the rear of the burner, away from the furnace. To free the slide gate, seven bolts which secure the bottom slide gate flange to the plenum housing must be loosened. In addition, another bolt which passes through the slide gate must be completely removed. Retracting the slide gate permits the bed material to drop vertically downward into a suitable collection vessel. Drainage of the regenerator is facilitated by a perforated cone located inside the plenum.
Supporting Documentation Dimension Information - Sheet 4343-20 Parts List - Sheet 4343-19
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Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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