Unigas H365X, Manual Of Installation - Use - Maintenance

Page: 14 / 116

PART I: SPECIFICATIONS
14
POWER REDUCTION WITH REFERENCE TO THE BURNER OPERATING CURVE
Since depowering the burner operating range is equivalent to increasing the burner power by the same percentage, the quickest proce-
dure is described point by point below:

Choosing the burner without taking flue gas recirculation into account

estimate the amount of recirculation (see figure below) required to ensure a certain NOx value as a function of the heat load of the
boiler, for that burner

multiply the required burned power by the depowering factor expressed as follows

multiply the back pressure in the combustion chamber by the depressurisation factor squared (pressure losses vary with the
square of the change in flow rate)

choose the burner considering the new power and back pressure value

if the burner size is insufficient, a larger machine must be selected, the depowering factor must be re-checked and the above pro-
cedure repeated.
Gas pressure
in
combustion
h
ead
H365X L-
Stm
3
/h
Ga
s pre
ssu
re
in
combu
stio
n hea
d
H440X L-
Stm
3
/h
H500X L-
Stm
3
/h
Burner pow
er
re
duction %
H365X
Thermic Load (MW/m
3
)