Sheet 4343-6 Page 3
CONTROL OF EXHAUST GAS FLOW FOR MULTIPLE ZONES OF TWINBED II BURNERS
at low fire and one zone at high fire, the low fire zone would not have sufficient combustion air blown through the regenerator for cooling. Regenerator exhaust temperature would rise (tempera- ture profile would also change), and there would be the potential for excessive temperatures in the exhaust system.
The exhaust control valve system on the front of this sheet puts equal suction on each regenerator. This is acceptable for a fur- nace with one temperature zone because air and exhaust flows through each TwinBed ® II are in balance. Multi-zone PAT or 2-position (High/Low) control presents a special problem. Equal suction at all regenerators means equal volumes of exhaust gases drawn through each regenerator. If one zone is
The system above limits exhaust flows when zone exhaust tem- peratures reach a predetermined point.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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