Riello RLS 280/E - 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); Minimum Furnace Dimensions

20106891
14
GB
Technical description of the burner
3.8.1 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. H
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 , 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
3.9 Minimum furnace dimensions
The firing rates were set in relation to certified test boilers.
Fig. 6 indicates the diameter and length of the test combustion
chamber.
Example RLS 510/E:
Output 19200 MBtu/hr: diameter 39.4 inch - length 16.5 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
15. 7 19. 7
23. 6
31. 5
39. 4 47. 2
ft
inches
ft= 0,12
MBtu/hr
18.9
11.3
7.5
1000
1.5
760
16.5
13.2
9.9
6.6
3.3
1.6
MBtu
hr
37870
23.0
29.6
22.7
Fig. 6
Diameter (inches)
Length (ft)
Furnace dimensions
D9396