Product Overview | Hot Spot Gas Burner
Ultraviolet flame supervision detectors are recommended for monitoring both main and pilot flames. An interrupted pilot must be used with flame supervision. Flame rods are not recommended. Bodies and internals of 4841 burners are heat-resistant cast iron, as are mounting or cover plates for the smaller sizes (-0 thru -2). Sizes -3, -4, -5, -6, and -7 have fabricated steel mounting or cover plates. Burners with cover plates (flangeless) are designated 4841; burners with mounting plates (flanges) are ordered by specifying 4841- -F (flanged mounting not available for sizes 4841-0 and -1). The tile is a dense castable refractory suitable for service at furnace temperatures to 3000°F.
4841 Hot Spot Gas Burners produce ultra-short flames with some forward direction. They combine radiation and convection heating for improved overall efficiency. Unlike Flat Flame Burners, 4841 products of combustion have no sideward travel beyond the burner tile, so they transfer less heat to the walls. Hot Spot burners provide precise flame direction and positioning. Among many applications they fire are: Slab and billet heaters . Roof-mounted Hot Spots provide more hot gas velocity on the load. Spot heating of weldments and castings. Ideal for building into automated equipment requiring compact heaters.
Continuous frit smelters. Hot Spot Burners provide radiation and convection heating for the charge end.
COMBUSTION AIR CAPACITIES, cfh (for Btu/h HHV, multiply by 100)
Burner
air pressure drop across the Burner in osi
4841 Burners are sealed-in. Their flame diameter is about the same as the tile opening. Flame length with 16 osi air varies from 3" on the 4841-0 Burner to 18" on the -7, evidence of rapid heat release that permits burners to focus intense inputs in localized areas.
designation
1
5
8
12
16
4841-0 4841-1 4841-2 4841-3 4841-4 4841-5 4841-6 4841-7
194 312
435 700
550 880
670
775
1 080 1 900 2 980
1 250 2 200 3 450
550 860
1 230 1 930
1 550 2 440
1 490 2 950 3 750 6 600
3 340 6 600 8 400 14 800
4 220 8 350 10 600 18 800
5 150
5 950
Standard ratio control systems , such as a cross connected atmospheric regulator, are suitable.
10 200 11 800 13 000 15 000 23 000 26 500
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. Operation is stable for air/gas ratios from stoichiometric to 20-70% excess air (depending on burner size and air pressure). Burners can run rich if there is free air in the combustion chamber. In a tight chamber, they must be set for about 20% excess air when chamber is cold during startup.
4841-8-A † 4841-8-B †
11 000 16 500
24 600 31 000 37 000 46 500
38 000 44 000 57 000 66 000
†See Sheet 4841-3 for information on these burners.
Figure 2. 4841-3-F Burner Flame- - ~ 8" long with 12 osi air (298 000 Btu/h HHV). Optional flanged mounting shown.
Figure 1. 4841-7 Hot Spot Burner focuses concentrated radiation heating on a specific hearth area.
Bulletin 4841 Page 2
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