Capacities | 6422 Fire•All™
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) with burners firing on stoichiometric air/fuel ratio can also be used for low temperature jobs (such as drawing or dry- ing at 600°F) with burners firing on lean ratio.
TILE SUPPORT JACKETS (6422- -LC, 6422- -L4, 6422- -L9 )
6422 Burners with the standard 9" long square tiles are also available with support jackets for applications such as air heaters where frequently the tile is not supported by refractory. They also can be mounted in furnaces when desired. Jackets are available in three different metals and maximum temperature ratings. They must be protected with sufficient insulation so as not to exceed rated temperature. Maximum temperature rating for jacket metals depends upon frequency of heat-up/cool-down cycles. As an example, batch annealing furnaces that are heated and cooled every day should use the "intermittent exposure" ratings. Burners in a continuous annealing furnace that remain at the same temperature for months at a time, can use the higher "continuous" rating.
Table I. TOTAL AIR CAPACITIES * scfh (for Btu/hr, multiply by 100)
Burner designation
16 osi air at burner
6422-2 6422-3 6422-4 6422-5 6422-6
2 600 4 100 6 300 10 300 15 700 27 000 33 500 44 800
Continuous Intermittent
Designation Jacket Metal max.temp.
exposure
6422- -LC 6422- -L4 6422- -L9
carbon steel
700°F 1600°F 1900°F
700°F 1500°F 1800°F
304 SST 309 SST
6422-7-A 6422-7-B 6422-8-A
* Includes combustion and atomizing air.
Table II. ATOMIZING AIR CAPACITIES in scfh
air pressure drop across burner in osi
Burner designation
14
16
18
20
22
24
520 560 600
620 800
650 840
6422-2, -3, -4
500 640 800 870
6422-5 6422-6
690 720 850 910
760
950 1000
1050 1150
6422-7-A,-7-B
930 990 1040 1100
6422-8-A
2650 2840 3000 3170 3320 3480
Table III. COMBUSTION AIR CAPACITIES in scfh (not including atomizing air)
approx. flame lengths with 16 osi Main Air (in open furnace)
air pressure drop across burner in osi
Burner
designation
0.1
1
5
6
8
12
16
gas
oil
160 280 460 750
520 890
1 160 1 980 3 240 5 300
1 270 2 160 3 540 5 800 9 100 16 000 19 900 25 800
1 470 2 500 4 100 6 700
1 800 3 050 5 000 8 150
2 100 3 550 5 800 9 450
½ '
1 ½ '
6422-2 6422-3 6422-4 6422-5 6422-6
1 ½ '
2'
1 450 2 370 3 700 6 550 8 150 10 500
2'
2 ½ ' 2 ½ '
2 ½ '
1180 2070 2580 3320
8 300 14 600 18 200 23 500
10 500 18 500 23 000 29 700
12 900 22 700 28 200 36 400
14 800 26 200 32 600 42 000
3' 6' 6' 7'
4' 6' 5' 6'
6422-7-A 6422-7-B 6422-8-A
Bulletin 6422 Page 3
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