North American TwinBed ® II Overview
Bulletin 4343
TYPICAL APPLICATIONS
aluminum melter steel forge furnace heat treat furnace
glass melter
steel reheat furnace
retort furnace
TwinBed II Regenerative Burners recover waste heat from furnace exhaust gases and preheat combustion air, to significantly increase efficiency over conventional burners or burners with recuperators. NOx emissions are extremely low, even when compared with cold air burners. TwinBed II regenerators are heat and corrosion resistant and tolerate hostile environments that can destroy recuperators. TwinBed II burners save significant amounts of fuel when applied to a variety of high temperature furnaces. The higher the process temperature, the higher the potential fuel saving when compared with conventional burners. REGENERATIVE FIRING Each TwinBed II has a compact heat storage regenerator containing ceramic balls. Operating in pairs, one burner fires while the other burner exhausts. Combustion air is preheated in the regenerator of the firing burner and furnace gas gives up heat to the regenerator in the exhausting burner. Burner operations are switched within an application specific time period. The burner that was firing, now exhausts; and the burner that was exhausting, now fires. Burner operation continues cycling between firing and exhausting.
FIRST HALF OF CYCLE
FIRING
EXHAUSTING
•
•
Combustion air reclaims stored heat
Regenerator stores heat
Air closed
Exh closed
60°F air
540°F exhaust
SECOND HALF OF CYCLE
FIRING
EXHAUSTING
•
•
Regenerator stores heat
Combustion air reclaims stored heat
Exh closed
Air 540°F closed exhaust
60°F air
Maximum TwinBed II Capacities with Drop Gate or Cassette Style Regenerators, 3/4" Diameter Media, 2150°F Furnace Temperature
Pressure Drop Firing ("w.c.)
Pressure Drop Exhausting ("w.c.)
Exhaust Temp. (°F)
HHV Available Heat
TwinBed
Maximum Capacity
80%
80%
80%
80%
SCFH Air 44,000 55,000 78,100 121,000 194,700 232,100 310,200 412,500
MMBtu/h
Size
Extraction
Extraction
Extraction
Extraction
4343-7
4.0 5.0
615 610 605 595 595 590 590 585
70% 70% 70% 70% 70% 70% 70% 70%
17.5 16.5 18.0 17.0 17.0 16.0 17.5 18.0
12.5 11.5 12.5 11.5 11.5 10.5 11.5 12.0
4343-8-A 4343-8-B 4343-9 4343-10 4343-12-A 4343-12-B
7.1
11.0 17.7 21.1
28.2 37.5
4343-14
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