Riello RS 28/E, Инструкции по установке, использованию и обслуживанию

Страница: 12 / 36

20044359 10
Technical description of the burner
Proceed as follows:

find the correction factor F in the Tab. E, page 10 for the
plant's air temperature and altitude.

Divide the burner's delivery Q by F in order to obtain the equiv-
alent delivery Qe:

In the firing rate range of the burner (Fig. 5) indicate the work
point defined by:
– Qe = equivalent delivery
– H1 = combustion chamber pressure
– The resulting point A must remain within the firing rate range

Plot a vertical line from Point A (Fig. 5), and find the maximum
pressure H2 of the firing rate.

Multiply H2 by F to obtain the maximum reduced pressure H3
of the firing rate.
If H3 is greater than H1 (Fig. 5), the burner delivers the output re-
quired.
If H3 is lower than H1, the burner's delivery must be reduced.
A reduction in delivery is accompanied by a reduction of the pres-
sure in the combustion chamber:
• Qr = reduced delivery
• H1r = reduced pressure
Example, a 5% delivery reduction:
• Qr = Q x 0.95
• H1r = H1 x (0.95)
2
Steps 2 - 5 must now be repeated using the new Qr and H1r values.
Tab. E
Qe = Q : F (MBtu/hr)
H3 = H2 x F (“ WC)
WARNING
The combustion head must be adjusted in respect
to the equivalent delivery Qe.
H1r = H1 x
( )
Qr
Q
2
"w.c.
MBtu/hr
Qe
H1
H3
H2
A
Fig. 5
D2617
Above
sea level
Average barom.
pressure
CORRECTION FACTOR
F
Air temperature °F (°C)
ft m “ WC mbar 0 (0°C) 41 (5°C) 50 (10°C) 59 (15°C) 68 (20°C) 77 (25°C) 86 (30°C) 104 (40°C)
0
329
658
987
1316
1645
1974
2303
2632
2961
3290
3947
4605
5263
5921
6579
0
100
200
300
400
500
600
700
800
900
1000
1200
1400
1600
1800
2000
399
394
389
385
380
376
372
367
363
358
354
346
337
329
321
313
1013
1000
989
978
966
955
944
932
921
910
898
878
856
836
815
794
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
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
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
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
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
0.996
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
0.980
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
0.948
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