Technical description of the burner
11
20160778
GB
3.6.1
Procedure to refer burner operating condition at an altitude and/or at a combustion supporter air
temperature different to the standard values (328 ft above sea level, 68 °F)
Tab. E
F
- correction factor of discharge head and delivery in relation to temperature and altitude.
Reference conditions:
–
Air temperature 68 °F (20 °C)
–
Barometric pressure 394 ''w.c. (1000 mbar)
–
Altitude 328 ft a.s.l. (100 m a.s.l.)
Example
Using the Tab. E, for an altitude of 3,000 ft and an air temperature
of 68 °F, an
F
factor value is obtained equal to 0.908;
if the capacity at the boiler furnace is Qfoc = 4,500 Mbtu/h, the cor-
rect output will be equal to:
Qburner = Qfoc / F = 4,500 / 0.908 = 4,956 Mbtu/h
3.7
Minimum furnace dimensions
The firing rates were set in relation to certified test boilers.
Fig. 3 indicates the diameter and length of the test combustion
chamber.
Example:
Output 2579 MBtu/hr:
diameter 24 inch - length 6.6 ft
AIR TEMPERATURE
Altitude
Altitude bar. press. bar. press.
0
5
10
15
20
25
30
40
°C
ft a.s.l.
m a.s.l.
"w.c.
mbar
32
41
50
59
68
77
86
104
°F
0
0
399
1013.00
1.087
1.068
1.049
1.031
1.013
0.996
0.980
0.948
328
100
394
1000.00
1.073
1.054
1,035
1,017
1.000
0.983
0.967
0.936
1.000
305
385
977.40
1.049
1.030
1.012
0.994
0.977
0.961
0.945
0.915
2.000
610
371
942.80
1.012
0.994
0.976
0.959
0.943
0.927
0.912
0.883
3.000
915
358
908.20
0.975
0.957
0.940
0.924
0.908
0.893
0.878
0.850
4.000
1.220
345
875.80
0.940
0.923
0.907
0,891
0.876
0.861
0.847
0.820
5.000
1.525
332
843.50
0.905
0.889
0,873
0.858
0.844
0.829
0.816
0.790
6.000
1.830
320
811.85
0.871
0.856
0.841
0.826
0.812
0.798
0.785
0.760
7.000
2.135
307
779.80
0.837
0.822
0.807
0.793
0.780
0.767
0.754
0.730
8.000
2.440
294
747.80
0.803
0.788
0.774
0.761
0.748
0.735
0.723
0.700
D2919
L
ength (
ft
)
F
urnace dimensions
Diameter (inches)
Fig. 3
