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3.8
Air side pressure drop (detected upline of the damper with complete opening)
The pressure curves refer to the combustion head adjustment
conditions according. In the event that the supplied air has a tem-
perature greater than 20°C and/or an altitude greater than 100 m.
a.s.l., the pressure drops of the head shown in the diagram are
multiplied by the coefficient K
Example:
Burnt output = 10000 kW - Altitude = 750 m. a.s.l. - Combustion
air temperature = 120 °C
m bar
Altitude
m. a.s.l.
0
20
0
0.920
0.988
100
0.932
1.000
500
0.976
1.047
750
1.007
1.080
1000
1.038
1.114
1250
1.069
1.147
1500
1.102
1.182
1750
1.130
1.213
2000
1.174
1.260
2250
1.206
1.294
2500
1.251
1.343
2750
1.284
1.378
3000
1.320
1.417
20198588
Technical description of the burner
indicated in Tab. E.
c
60
50
40
30
20
10
0
2000
4000
30
40
50
1.021
1.055
1.089
1.034
1.069
1.103
1.083
1.119
1.155
1.117
1.154
1.191
1.152
1.190
1.228
1.186
1.226
1.265
1.223
1.263
1.304
1.254
1.295
1.337
1.303
1.346
1.389
1.338
1.382
1.427
1.389
1.434
1.480
1.425
1.472
1.519
1.465
1.514
1.562
From the diagram, for an output of 10000 kW, the total pressure
drop obtained at the head is equal to: p
tion air at 20 °C and 100 m. a.s.l. altitude).
In Tab. E there is a multiplier coefficient, for combustion air at
120 °C and an altitude of 750 m. s.l.m., equal to Kc = 1.449.
The total pressure drop of the burner head is:
p = p
x K
20
c
6000
8000
10000
Burner output Pb - kW
K
c
Air temperature °C
60
70
80
1.122
1.156
1.190
1.137
1.171
1.205
1.190
1.226
1.262
1.228
1.265
1.302
1.266
1.304
1.342
1.304
1.343
1.382
1.344
1.384
1.425
1.378
1.419
1.461
1.432
1.475
1.518
1.471
1.515
1.559
1.526
1.572
1.618
1.566
1.613
1.660
1.610
1.659
1.707
10
GB
20
= 34 x 1.449 = 49.2 mbar.
D3977
12000 14000
KW
90
100
120
1.223
1.257
1.325
1.239
1.273
1.342
1.298
1.333
1.405
1.338
1.375
1.449
1.380
1.418
1.494
1.421
1.460
1.539
1.465
1.505
1.586
1.502
1.544
1.626
1.561
1.604
1.690
1.603
1.647
1.736
1.664
1.709
1.801
1.707
1.754
1.848
1.755
1.804
1.901
= 34 mbar (combus-
Fig. 5
140
150
1.392
1.426
1.410
1.444
1.477
1.512
1.523
1.560
1.570
1.608
1.617
1.656
1.667
1.707
1.709
1.751
1.776
1.819
1.824
1.868
1.893
1.939
1.942
1.989
1.997
2.046
Tab. E
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