Bulletin 4682 Page 2
4682 Burners are open fired nozzles fed an air-gas premixture by a 3065 aspirator or 3070 inspirator mixer. They produce a well defined, medium to high velocity blue flame when at high fire on stoichiometric ratio. These nozzles are never sealed into a refractory wall, rather they provide stable combustion firing in the open or through a tunnel in the furnace wall. A 4682 nozzle can have its own air-gas mixer; or a gang of nozzles can be fed by one mixer. Mixture pressures as high as 12"w.c. and as low as 0.25"w.c. imply available turndown of about 7:1. However, such is difficult to count on in the "real world:" Certain piping arrangements can cause low pressure pockets in the mixture line that allow flashback long before the 0.25"w.c. theoretical flashback point is reached at the mixer discharge .
4682 nozzles and a 4696 compressed air torch with a nozzle -- torch is handy for many spot and preheating jobs.
4682 Burners can be run fuel rich if secondary air is available around the nozzle. This increases capacity and (in some cases) widens turndown available, but flames are longer and usually have less drive.
Table 1
Combustion Air Capacities (see note below) scfh
Mixture Pressure in inches of water
Burner designation
1
2
5
6
7
10 — — — — — — — — — — —
12 — — — — — — — — — — —
4682-0-A/BO 4682-0-B/BO 4682-0-C/BO 4682-1-A/BO 4682-1-B/BO 4682-2-A/BO 4682-2-B/BO 4682-2-C/BO 4682-2-D/BO 4682-3-A/BO 4682-3-B/BO 4682-4-A/BO 4682-4-B/BO 4682-4-C/BO 4682-5-A/BO 4682-5-B/BO 4682-6-A/BO 4682-6-B/BO 4682-6-C/BO 4682-7-A/BO 4682-7-B/BO 4682-7-C/BO 4682-8-A/BO 4682-8-B/BO 4682-8-C/BO 4682-8-D/BO
200 250 280 350 440 560 650
280 350 400 490 620 790 920
440 560 640 790 990 1260 1460 1750 1980 2200 2690 3360 4270 4610 5500 6500 7200 8650 9550
480 610 700 860 1070 1370 1590 1910 2150 2390 2930 3660 4650 5000 6000 7100 7800 9400
520 660 750 920 1160 1480 1720 2060 2320 2590 3170 3960 5000 5400 6500 7650
780 880 980 1200 1500 1900 2050 2450 2900 3200 3850 4250 4750 6000 7050
1100 1240 1380 1690 2120 2680 2890 3450 4100 4510 5450 6000 6700 8450 9950
4760 6000 6500 7750 9200
5150 6550 7050
8450
10 000
8450
10 100 12 200 13 400 15 000 19 000 22 200 33 200 41 300 57 000 68 000
11 000 13 200 14 600 17 000 20 600 24 200 36 200 44 900 62 000 74 000
10 200 11 200 12 600 15 800 18 600 27 700 34 400 47 600 57 000
10 300
10 600 13 400 15 800 23 500 29 200 40 400 48 100
11 600 14 700 17 200 25 600 31 800 44 000 52 500
10 500
14 800 18 400
1300
18 000 21 500
2500
30 200
—
—
4682-9/BO
37 700
53 000
84 500
92 000
99 500
NOTE:
For Btu/h HHV, multiply air capacity by 100. If secondary air is available around nozzle, burner can be run fuel rich and Btu/h HHV capabilities increased by factors in adjoining table.
% Combustion Air Through Burner
Multiply
Capacity by
90 80 70
1.1
1.22 1.38
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