Test Boiler - Riello RL 190/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento

m a.s.l.
(1)
M mbar
0 1013
100 1000
200 989
300 978
400 966
500 955
600 944
700 932
800 921
900 910
1000 898
1200 878
1400 856
1600 836
1800 815
2000 794
Average barometric pressure
(1)
To check it, proceed as follows:
1 Find the corrective factor F (Tab. B) relating to the air tem-
perature and altitude of the system.
2 Divide the burner's delivery Q by F in order to obtain the
equivalent delivery Qe:
Qe = Q : F (kg/h)
mbar
D388
3 In the firing rate range of the burner, (Fig. 4), indicate the
work point defined by:
Qe = equivalent delivery
H1 = combustion chamber pressure
The resulting point A must remain within the firing rate
range.
4 Trace a vertical line from point A, (Fig. 4), 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
H3 = H2 : F (mbar)
If H3 is greater than H1, as in (Fig. 4), the burner can produce the
delivery requested.
Technical description of the burner
0 5
1,087 1,068 1,049
1,073 1,054 1,035
1,061 1,042 1,024
1,050 1,031 1,013
1,037 1,018 1,000
1,025 1,007 0,989
1,013 0,995 0,977
1,000 0,982 0,965
0,988 0,971 0,954
0,977 0,959 0,942
0,964 0,946 0,930
0,942 0,925 0,909
0,919 0,902 0,886
0,897 0,881 0,866
0,875 0,859 0,844
0,852 0,837 0,822
Qe
kg/h
F
AIR
°C
10 15 20
1,031 1,013
1,017 1,000
1,006 0,989
0,995 0,978
0,983 0,966
0,972 0,955
0,960 0,944
0,948 0,932
0,937 0,921
0,926 0,910
0,914 0,898
0,893 0,878
0,871 0,856
0,851 0,836
0,829 0,815
0,808 0,794
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)
With the new values - Qr and H1r - repeat steps 2 - 5.
the combustion head must be adjusted in respect
to the equivalent delivery Qe.
Fig. 4
WARNING
4.4.1

Test boiler

The firing rates were set in relation to special test boilers in ac-
cordance with the methods defined in EN 267 standards.
Fig. 5 indicates the diameter and length of the test combustion
chamber.
Example:
delivery 200 kg/hour:
diameter = 80 cm; length = 3,5 m.
Whenever the burner is operated in a much smaller commercial-
ly-available combustion chamber, a preliminary test should be
performed.
9 GB
25 30
0,996 0,980
0,983 0,967
0,972 0,956
0,962 0,946
0,950 0,934
0,939 0,923
0,928 0,913
0,916 0,901
0,906 0,891
0,895 0,880
0,883 0,868
0,863 0,849
0,842 0,828
0,822 0,808
0,801 0,788
0,781 0,768
Qr 2
( )
H r = H x
1 1
Q
2
D688
40
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
Tab. B
Fig. 5
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