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11
20098687
GB
Technical description of the burner
4.7.1
Firing rate based on the air density
The firing rate of the burner indicated in the manual refers to an
ambient temperature of 20°C and an altitude of 0 m. above sea
level. (barometric pressure about 1013 mbar).
It may happen that a burner has to operate with combustion air at
a higher temperature and/or higher altitudes.
The heating of the air and the increase in altitude produce the
same effect: the expansion of the air volume (i.e. the reduction of
its density).
The delivery of the burner fan remains essentially the same, but
the oxygen per m
3
of air, and the thrust (discharge head) of the
fan are reduced.
It is therefore important to know if the maximum output requested
from the burner at a determinate combustion chamber pressure
remains within the firing rate of the burner even with the changed
temperature and altitude conditions.
To check it, proceed as follows:
1
find the corrective factor F, relating to the air temperature
and altitude of the system, in Tab. F.
2
Divide the output Q required from the burner by F to obtain
the equivalent output Qe:
3
In the firing rate of the burner, mark the work point identified
by:
Qe = equivalent output
H1 = pressure in combustion chamber
point A that must remain within the firing rate.
4
Trace a vertical line from point A) (Fig. 3), and find the maxi-
mum pressure H2 of the firing rate.
5
Multiply H2 by F to obtain the maximum lowered pressure
H3 of the firing rate
If H3 is greater than H1)(Fig. 3), the burner can supply the re-
quired output.
If H3 is less than H1, it is necessary to reduce the burner output.
The reduction in output is accompanied by a reduction in com-
bustion chamber pressure:
Qr
= reduced output
H1r = reduced pressure
Example, 5% reduction in output:
Qr = Q x 0.95
H1r = H1 x (0.95)
2
With the new values - Qr and H1r - repeat steps 2 - 5.
Tab. F
Qe = Q : F (kW)
H3 = H2 x F (mbar)
WARNING
The combustion head should be adjusted in rela-
tion to the equivalent output Qe.
H1r = H1 x
(
)
Qr
Q
2
Qe
kg/h
mbar
Qe
kW
mbar
A
H1
H2
H3
D388
Fig. 3
Altitude
Average
barometric
pressure
F
Air temperature °C
m. a.s.l.
mbar
0
5
10
15
20
25
30
40
0
100
200
300
400
500
600
700
800
900
1000
1200
1400
1600
1800
2000
2400
2800
3200
3600
4000
1013
1000
989
978
966
955
944
932
921
910
898
878
856
836
815
794
755
714
675
635
616
1.087
1.073
1.061
1.050
1.037
1.025
1.013
1.000
0.988
0.977
0.964
0.942
0.919
0.897
0.875
0.852
0.810
0.766
0.724
0.682
0.661
1.068
1.054
1.042
1.031
1.018
1.007
0.995
0.982
0.971
0.959
0.946
0.925
0.902
0.881
0.859
0.837
0.796
0.753
0.711
0.669
0.649
1.049
1.035
1.024
1.013
1.000
0.989
0.977
0.965
0.954
0.942
0.930
0.909
0.886
0.866
0.844
0.822
0.782
0.739
0.699
0.657
0.638
1.031
1.017
1.006
0.995
0.983
0.972
0.960
0.948
0.937
0.926
0.914
0.893
0.871
0.851
0.829
0.808
0.768
0.726
0.687
0.646
0.627
1.013
1.000
0.989
0.978
0.966
0.955
0.944
0.932
0.921
0.910
0.898
0.878
0.856
0.836
0.815
0.794
0.755
0.714
0.675
0.635
0.616
0.996
0.983
0.972
0.962
0.950
0.939
0.928
0.916
0.906
0.895
0.883
0.863
0.842
0.822
0.801
0.781
0.742
0.702
0.664
0.624
0.606
0.980
0.967
0.956
0.946
0.934
0.923
0.913
0.901
0.891
0.880
0.868
0.849
0.828
0.808
0.788
0.768
0.730
0.690
0.653
0.614
0.596
0.948
0.936
0.926
0.916
0.904
0.894
0.884
0.872
0.862
0.852
0.841
0.822
0.801
0.783
0.763
0.743
0.707
0.668
0.632
0.594
0.577
Содержание 3897304
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