Product Overview | 6421 Take-Apart Burner
EASY ACCESS FOR CLEANING PROCESS RESIDUE FROM BURNER TILE The 6421 Quick Take-Apart Dual-Fuel Burner is designed specifically for dirty atmospheres that tend to plug burner firing tunnels. Some processes, such as a multiple hearth sludge or regeneration furnace, often have significant ash and other build- up that must be removed to maintain optimum performance. The 6421 has a readily removable backplate and internals to allow quick access to its tile, which facilitates cleaning the burner tunnel "on the fly". Cleaning a conventional burner tile requires dismantling piping and removal of the burner, which involves expensive labor and possible loss of production. Quick Take-Apart Burner performance characteristics are similar to North American’s renowned 6422 series. Thus they are appropriate for a wide variety of industrial heating applications from low temperature ovens to high temperature metallurgical, ceramic, etc. furnaces.
Removal of 6421 internals is accomplished by breaking the oil line (using quick disconnects with shutoff) and loosening four hand knobs and swinging the four bolts to the side (as shown in Figure 2) for the -4 through -6 sizes. The -7-A through -8-A sizes have six readily accessible cap screws to remove. Reassembly is just as quick and easy. QTA Burners are sealed-in, nozzle-mix units for gas and/or light oil. Models are available with air lines from 2" to 6". Capacities range from 700,000 to 4,000,000 Btu/h HHV. They have built-in limiting orifice valves for setting air/gas ratio. Flame supervision with UV detectors is strongly recommended. A 4011-12 pilot set is recommended for individual burner ignition. When multiple burners share a single pilot pre-mix header, a 4021-12 pilot tip per burner with an appropriately sized air/gas mixer is recommended. Maintain at least 14 osi atomizing air (at the burner) when burning oil, 4 osi or more (to cool the atomizer) when burning gas.
Internals removed for tile cleaning (shows hand knobs on sizes -4 through -6).
CAPACITIES in scfh--multiply by 100 for Btu/h HHV.
16 osi Main Air, 14 osi Atomizing Air
0.5 osi Main Air, 14 osi Atomizing Air
Max %
Max %
Burner
XSAir
XSAir
designation
Main
Atom.
Total
Gas
Oil
Main
Atom.
Total
Gas Oil
6421-4 6421-5 6421-6
6 690 9 900
425 400 400 480 400 400
7 115
425 475 225 875 600 250
350 575 350 525 400 180
1200 1800 2700 5400 8100 9160
430 440 400 520 600 650
1630 2240 3100 5920 8700 9810
275 150
10 300 15 400 31 080 38 800 42 700
75
75
15 000 30 600 38 400 42 300
450
125
6421-7-A 6421-7-B 6421-8-A
500 325
350
50
300 100
Burner can be operated with up to 16 osi main air pressure.
DIMENSIONS SHOWN ARE SUBJECT TO CHANGE. PLEASE OBTAIN CERTIFIED PRINTS FROM FIVES NORTH AMERICAN COMBUSTION, INC. IF SPACE LIMITATIONS OR OTHER CONSIDERATIONS MAKE EXACT DIMENSION(S) CRITICAL .
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.
Bulletin 6421 Page 2
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