Riello 40 FS - Firing Rate; Test Boiler; Commercial Boilers; Correlation between Gas Pressure and Burner Output

9
20063732
GB
Technical description of the burner
4.6 Firing rate
The burner output is chosen from within the diagram area
(Fig. 2).
4.6.1 Test boiler
The firing rate has been defined according to EN 676 standard.
4.6.2 Commercial boilers
The burner-boiler matching is assured if the boiler conforms to
EN 303 and the combustion chamber dimensions are similar to
those shown in the diagram EN 676.
For applications where the boiler does not conform to EN 303, or
where the combustion chamber is much smaller than the dimen-
sions given in EN 676, please consult the manufacturers.
4.7 Correlation between gas pressure and burner output
To obtain the maximum burner output (Fig. 3), 5.8 mbar meas-
ured at the pipe coupling are needed (M2, Fig. 14 on page 16)
with the combustion chamber at 0 mbar and gas G20 - Ncv = 10
kWh/Nm
3
(8,570 kcal/Nm
3
).
WARNING
The firing rate value (Fig. 2) has been obtained
considering an ambient temperature of 20°C, an
atmospheric pressure of 1013 mbar (approx. 0 m
above sea level), and with the combustion head
adjusted as shown on pag. 15.
Combustion chamber
pressure - mbar
Fig. 2
Thermal power
D5256
0.8
0
0.2
0.4
0.6
40,000 50,000 60,000 70,000 kcal/h
1206050 70 80 kW
1.0
110
80,000
1.2
90 100
90,000
1.4
40
1.6
100,000
Thermal power
D5257
Fig. 3
4
1
2
3
5
6
7
40,000 50,000 60,000 70,000 kcal/h
1206050 70 80 kW110
80,000
90 100
90,000
40
100,000
Gas pressure in the
pressure - mbar