Sheet 4624 page 2
ENGINEERING DATA Burner Capacities with 100% air through burner j
Blast tip burner designantion
"w.c. mbar
0.5 1.2
1.0 2.5
4.0 10.0
5.0 12.5
6.0 14.9
8.0 19.9
10.0 24.9
Btu/h HHV
7000
10 000
20 000
22 000
24 000
28 000
31 000
kW LHV
1.85
2.64 100
5.28 200
5.81 220
6.34 240
7.39 280
8.18 310
4624-02
Air Flow scfh
70
(Nm 3 /h)
(1.87)
(2.67)
(5.35)
(5.88)
(6.42)
(7.48)
(8.29)
Btu/h HHV
11 000
15 000
30 000
34 000
37 000
43 000
48 000
kW LHV
2.90
3.96 150
7.92 300
8.98 340
9.77 370
11.35
12.67
4624-01
Air Flow scfh
110
430
480
(Nm 3 /h)
(2.90)
(3.96)
(7.92)
(8.98)
(9.77)
(11.35)
(12.67)
Typical stoichiometric ratio by volume for air/natural gas premix = 10:1. For air/propane premix = 24:1.
j Burners can be run with less than 100% primary air (rich) if sufficient secondary airis available. If operating with 90% primary air, multiply capacities above by 1.11; multiply by 1.22 for 80% primary air. The obsolete 4622 burners were the same capacity as the 4624.
∆ P 1 ∆ P 2 √
Selection Example: Select blast tips and an aspirator mixer for 148 000 Btu/h HHV release on natural gas. Tips are to operate over 3:1 turndown on stoichiometric ratio. Minimum permissible mixture pressure is 0.25"w.c. (0.62 mbar), therefore required high fire mixture pressure to obtain 3:1 turn- down is based on the following equation: If the -02 tips are selected, 10 are required for the desired capac- ity (10 X 14,800 Btu/h HHV = 148,000 Btu/h HHV). From Bulletin 3065, a 3065-3-11 Mixer, with a capacity of 1550 scfh air at 2.5"w.c. mixture pressure will suffice. This mixer has a 1½“ pipe size outlet; so fabricate the blast tip manifold from 1½” pipe
2 × ∆ P
∴ ∆ P 1 = (Turndown Ratio)
T urndown Ratio =
2
0.25"w.c. × 3 2 = 2.25"w.c.
At this pressure, -02 tip capacity can be calculated as follows:
√ ∆ P 2 ∆ P 1
Q 2 = Q 1 Q 2 for -02 tip = 22 000 at 5"wc (from capacity chart below) 22 000 × = 14 800 Btu/h HHV.
√ 2.25" 5"
5" √
2.25"
Q 2 for -01 tip = 34 000 ×
= 22 800 Btu/h HVV.
A NPT
A NPT
E
E
B
C
B
C
F
F
4624
4622
D
D
Blast tip
dimensions in inches (mm)
weight oz (kg) 1.8 (0.05) 2.3 (0.07) 3.0 (0.09) 3.4 (0.10)
Open flow area
designation A NPT
B
C
D
E
F
inch2 0.085 0.131 0.085 0.131
mm2 (54.8) (84.5) (54.8) (84.5)
4622-02 4622-01 4624-02 4624-01
3/8 1/2 3/8 1/2
0.38 (9.5) 0.44 (11) 0.38 (9.5) 0.44 (11)
0.88 (22) 0.88 (22) 0.88 (22) 0.88 (22)
1.25 (32) 1.31 (33) 1.25 (32) 1.31 (33)
1.13 (29) 1.31 (33) 1.13 (29) 1.25 (32)
1.0 (25.4) 1.19 (30) 1.44 (37) 1.44 (37)
Note: the 4622 burners are now obsolete, replace with 4624
DIMENSIONS SHOWN ARE SUBJECT TO CHANGE. PLEASE OBTAIN CERTIFIED PRINTS FROM FIVES NORTH AMERICAN COMBUSTION, INC. IF SPACE LIMITATIONS OR OTHER CONSIDERATIONS MAKE EXACT DIMENSION(S) CRITICAL .
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