Gas Side Pressure Drop - Riello DB 3 SE FGR Installation, Use And Maintenance Instructions

3.9

Gas side pressure drop

Gas pressure on the basis of the maximum output developed by
the burner is given by the curves in Fig. 4.
It represents the pressure drop in the combustion head.
Natural gas G 20 - N.C.V.. = 10 kWh/Nm
The curves were taken in the following conditions:
– pressure measured at the test point on the pressure switch
downstream from the gas butterfly valve;
Combustion head pressure drop
m bar
Butterfly valve pressure drop
Technical description of the burner
3
60
50
40
30
20
10
0 1000 2000
8, 0
7, 2
6, 4
5, 6
4, 8
4, 0
3, 2
2, 4
1, 6
0, 8
0 1000
– combustion chamber at 0 mbar;
– burner working at full output.
WARNING
The pressure drop of the completely open butterfly valve is given
4000
Burner output Pb [kW]
DB3
2000 4000
Burner output Pb [kW]
10 GB
Add the pressure of the combustion chamber in
mbar to the value of the combustion head drop.
D8257
6000 8000
DB4
D8903
6000
KW
KW
Fig. 4
Fig. 5
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