Product Overview | 4422 Fire•All™
4422 Fire•All™ burners are widely used on heat treat and nonferrous melting furnaces, kilns, ovens, air heaters, dryers, chemical process equipment, and other applications where superior temperature uniformity is required.
There is a potential increase in fuel consumption because of heating extra air. The benefits, such as better products from improved heating, far outweigh the small increase in fuel costs. Consult your Fives North American Combustion, Inc. field engineer for an analysis of your application. APPLICATION TEMPERATURES The 4422 Fire•All™ burners can be used with chamber tempera- tures up to 2000 °F (1093 °C). If furnace temperature could rise above 1900 °F (1038 °C) after shutdown, some air should be maintained through the burner to prevent overheating. For higher temperature service (>2000 °F (1093 °C)), see Bulletin 4425. STANDARD CONSTRUCTION Burner bodies are heat resistant cast iron with Inconel air tubes. Mounting plate and tile assembly can be separated from the burner body for installation convenience. Air and gas connection orientation can be rotated in 90° intervals. When reassembling the burner, the pilot and flame detector notches in the tile and mounting must be in proper alignment with the pilot and flame detector connections on the burner body (applies to 4422-2 through 4422-6 sizes). Burner is complete with cast iron mounting plate and 9" (228.6 mm) long 3200 °F (1760 °C) castable burner tile which must be supported and sealed in a hard refractory furnace wall. (See page 2 for optional construction suitable for fiber lined furnaces.) When the furnace wall is thicker than the tile length, the tunnel beyond the end of the burner tile should be flared at a 30° or greater included angle, starting at the OD of the tile. Extension tiles are not recommended.
OPERATION FROM FUEL RICH TO EXCESS AIR WITH LOW NOx EMISSIONS
These sealed-in, nozzle-mix burners are stable over a wide range of air/gas ratios from large amounts of excess air, to stoichiometric (chemically correct air/gas ratio), up to 50% excess fuel (provided additional air for combustion is supplied to the furnace near the burners). Burners can be ignited at rich, lean, or correct air/gas ratio, then immediately turned to high fire. NOx emissions are low for all air/gas ratios. The most common ratio control system for 4422 Fire•All™ burners uses a cross-connected regulator. When appropriate for the application, fully metered flow systems and fuel only control are very satisfactory. Required gas pressures are low: 1.73"w.c. (4.30 mbar) at burner for coke oven gas, less for natural gas (approximately 0.52"w.c. (1.29 mbar). BENEFITS OF EXCESS AIR Excess air can improve temperature uniformity by avoiding hot spots in front of burners, by churning furnace atmosphere to reduce stratification, and by creating positive furnace pressure to eliminate cold air infiltration. Excess air can give very high effective burner turndown. Thus, a furnace used for high temperature work (such as heat treating at 1900 °F (1038 °C)) with burners firing on stoichiometric air/gas ratio can also be used for low temperature jobs (such as drawing or drying at 600 °F (316 °C)) with burners firing on lean (excess air) air/gas ratio.
Combustion Air Capacities, scfh (Nm 3 /h) (for Btu/h HHV, multiply air flow in scfh by 100) air pressure drop across the burner in various units
Approx. flame length with 27.7"w.c.
Max. percent excess air* (at 16 osi (69 mbar) & direct spark)
0.2 0.3 0.9
1
4
8
12
16
osi "w.c. mbar
(69 mbar) feet (mm)
Burner
1.7
6.9 17.2
13.9 34.6
20.8 51.8
27.7
Designation
4.3
69
4422-2 4422-3 4422-4 4422-5 4422-6
200 (5) 360 (10) 560 (15) 750 (20) 1600 (43) 1900 (51) 3100 (83) 3650 (98)
420 (11) 810 (22)
910 (24) 1800 (48) 2600 (69) 4350 (116)
1270 (34) 2450 (65) 3820 (102) 6300 (168)
1500 (40) 3100 (83) 4500 (120) 7650 (204)
1920 (51) 3600 (96) 5500 (147) 9050 (242) 14750 (394) 17300 (462) 27000 (722) 32500 (869) 43500 (1163)
1.5 (457)
300 450 450 500 500 600
2 (610)
1320 (35) 2050 (55) 3100 (83) 3400 (91)
2.5 (762) 3 (914) 4 (1219) 5 (1524) 5 (1524) 6 (1829) 7 (2134)
7200 (192) 10300 (275) 12700 (339)
4422-6-B 4422-7-A 4422-7-B 4422-8-A
8100 (217)
12100 (323)
15000 (401)
7250 (194) 14000 (374) 20200 (540) 23100 (617) 8150 (218) 16600 (444) 23550 (629) 28000 (748)
2000 2000 2000
4800 (128) 11000 (294) 22600 (604) 31500 (842) 37700 (1008)
* Excess air rates are improved with constant pilot air.
Bulletin 4422 Page 2
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