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AALBORG
INDUSTRIES
21-54/60
I I
COMMISSIONING OM5560 97#A.2
I -
2.3.1
Change
of
fuel
Step A: Stop the burner.
Step
B: Check that oil
is
present in the heavy fuel oil tank. Open the stop valves,
which connect the heavy fuel oil tank to the oil system. To avoid cavitation
of
the ring line oil pumps, the viscosity
of
the oil in the heavy fuel oil tank
should not exceed 380 cSt. Ifnecessary, the oil tank should be heated.
Step
C: Check the tracing systems for the oil system and the burner unit
is
opera-
tional.
Step D: Select heavy fuel oil on the manually operated three-way valve. Check that
the control system indicates heavy fuel oil operation.
Step E: Adjust the oil temperature set point as well as the low and high limit set
points on the temperature controller in the control system; see also the chap-
ter "Electric pre-heater". The viscosity
of
the oil at the nozzle head should
be between
14
-
16
cSt. The pre-heating temperature can
be
determined by
means
of
the chart in the chapter "Viscosity-temperature chart".
Step F: Adjust the set points for low shut down, low alarm, and high alarm on the
control panel. Adjust
if
necessary.
Step
G: Start the burner from the control system.
It
might be necessary to start the
burner several times before the pre-heating temperature
is
sufficiently high.
Step
H: Check that the temperature is raised to
the
desired set point. Adjust
if
nec-
essary.
2.3.2 Operation on heavy fuel oil
When the burner
is
commissioned on heavy fuel oil, final adjustments
of
the combus-
tion process should be carried out to achieve high quality performance data. The aim
is to operate the burner with lowest possible
02
content and highest possible
C02
content without the risk
of
an uncompleted combustion (black smoke). At the same
time the reliability
ofthe
burner must be ensured.
The oiIlair ratio should be checked and adjusted through the complete burner range to
ensure a correct combustion. The oil/air ratio can be checked by measurements
of
the
soot spot No. and the 02 content and/or the C02 content
in
the flue gas. The visual
appearance
of
the flame should also be checked.
If
the amount
of
combustion air to
the burner for given oil flow
is
too low, the combustion will be uncompleted, and it
produces black smoke. Although the
02
content
is
low, and the
C02
content
is
high,
the air flow should be increased. If, on the other hand, the
02
content
is
high and the
C02
content
is
low,
it
indicates that the air flow for the combustion process must be
decreased.
It
is
not only the oil/air ratio which
is
an
important factor for the combustion process,
but also the air velocity for the combustion.
The air velocity
in
the combustion head can be adjusted
by
moving the adjustment
ringin relation to the flame tubeto change the distance between the adjustment ring and
the edge
of
the diffuser disc. On low capacity the adjustment ring
is
advanced and
on
high capacity retracted.
If
the adjustment ring
is
set too far forward, the combustion
air velocity
in
the combustion head
is
too high, the ignition
is
more difficult or there
is
110t
enough air to support the combustion (high CO content). Tfthe adjustment ring
Language
UK
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