baltur TBML 900 ME Instruction Manual For Installation, Use And Maintenance page 60

ENGLISH
Example
• Burner
• Pressure measured on port G: Ptc = 48 mbar
• Back pressure measured in the furnace: Pcc = 10 mbar
• Head pressure value without the back pressure in the
furnace: P = 48-10 = 38 mbar
From the diagram, in correspondence of pressure P= 38 mbar, a
combusted thermal flow rate of about 7300 kW can be inferred.
POWER AT START-UP
The standard EN 676 prescribes that for burners with maximum
output above 120 kW the ignition must occur at a reduced power
Pstart than the maximum power of operation Pmax at which the
burner is calibrated.
Pstart depends on the safety time of the burner equipment; in
particular:
ts = 2s → Pstart ≤ 0.5 x Pmax.
ts = 3s → Pstart ≤ 0.333 x Pmax.
IMPORTANT
This method permits only an approximate estimate of
the combusted thermal flow rate delivered, for a precise
measuring, refer to gas meter.
Example if the maximum regulation power of the burner Pmax is
equal to 900 kW, it must be:
Pstart ≤ 450 kW where ts = 2s
Pstart ≤ 300 kW where ts = 3s
mbar
100
80
60
(Y)
40
20
0
1
X : Thermal flow rate (kW x 1000).
Y : Net pressure in gaseous fuel head (mbar).
3
2 4
5
(X)
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Check power at ignition
• Disconnect the flame sensor wire (in this case the burner
turns on and goes into lock-out after the safety time ts).
• Perform 10 consecutive ignitions and following block.
• Measure at the meter the amount of gas burned Qstart [m³]
and check that Qstart ≤ Pmax /360 ( in m³/h)
Example
Pmax = 90 m³/h (about 900 kW with natural gas)
After 10 ignitions with the related lock out, the gas consumption
read on the meter must be:
Qstart ≤ 90/360 = 0.25 [m³]
If this does not occur, reduce the flow of gas to the ignition through
the brake of the valve.
6 7 8
G
kWx1000
9