Product Overview | 4950 Flame Grid
FEATURES 4950 Flame Grids are used to incinerate organic vapors from ovens and industrial processes. Flame Grid burners are inserted into fume-carrying ducts, filling the duct cross section. They release heat uniformly across the duct, using minimum gas to ignite combustible pollutants in the fumes. Incineration is completed in a suitably sized combustion chamber (user built) downstream of the burner.
FLAME GRID DUCT SECTIONS
For maximum installation convenience, 4950-0812 through -3648 Burners are available assembled to refractory-lined, cylindrical steel duct sections of short length. These assemblies, designated 4950- -D, can be attached, by welding or compression bands, to upstream and downstream duct sections furnished by the customer. Exterior dimensions of several 4950D sections match commercially available prefabricated stacks and chimneys. See Sheet 4950-4 for details.
Flame Grids can be mounted in horizontal or vertical (upflow or downflow) ducts and can be used with recuperators.
CONSTRUCTION
Adjustable mixing plates on Flame Grids permit setting of effluent pressure drop across the burner to achieve efficient mixing of fumes and flames.
Metal parts are heat-resistant cast iron and steel alloy. Burner mounting is lined with insulation to reduce its outer surface tem- perature. Optional hard refractory internal insulation (adds 6" to "A" dimension) is available for use with refractory-lined ducts and 900-1100°F inlet temperatures.
Flame Grids use combustion air from the effluent stream, so no blower is required. See page 2 for effluent oxygen requirement.
APPLICATION Flame Grid burners are suitable for the following conditions:
All Flame Grids include spark-ignited pilot assembly, observation port, and provision for flame detection device.
Fume temperature at burner inlet: 1100°F maximum
SELECTION. Because the fume stream is the burner’s air source, it must contain enough oxygen for complete combustion of all contaminants and auxiliary fuel (gas). Minimum oxygen requirements vary with fume stream temperature--see Figure 1.
Temperature at burner outlet: 1200-1600°F. Temperature required depends on nature of fume or smoke being incinerated.
Temperature rise across burner: 200°F minimum 1600°F maximum
18
Duct pressure upstream of burner: 2.0"w.c. maximum
16
Fume stream pressure drop across burner: 0.2"w.c. minimum 2.0"w.c. maximum
14
NOTE: Curve is based on 1400°F burner outlet temperature and natural gas fuel. For other conditions consult factory.
12
Minimum oxygen content of fume stream: See page 2
100
300
500
700
900
1100
Fume inlet temperature, F
Flame Grid burners are not suitable for halocarbons.
Figure 1. Minimum oxygen content in fume stream.
Bulletin 4950 Page 2
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