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i,lliil'i
AALBORG
INDl!STRIES
21-42/60
,
OPERATING
INSTRUCTIONS'
OM5560 99#A.2
I I -
In operation mode, the control system attempts to maintain the steam pressure at the
desired set point by regulation
of
the burner load. The burner can be regulated through
the complete load range from minimum load to fuIlload.
However, should the steam demand decrease below the minimum firing load
of
the
burner, the steam pressure will increase to the set point for burner stop. The burner
stops and remains stopped until the set point for burner operation
is
reach,ed again.
2.4
Change
from
diesel
oil
operation
to
heavy fuel
oil
operation
When the fuel supply
is
changed from diesel oil operatipn to heavy fuel oil operation,
the following work steps should be carried out:
Step A: 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.
Step B: Select heavy fuel oil on the manually operated three-way valve.
Note:
When
the fuel type
is
changed
from
diesel oil to heavy fuel oil, a
shut
down
for
low oil
temperature
may
arise.
If
the
burner
is in operation,
it
wiUstop
due
to this
shut
dO,wn.
.
Step C: Restart the burner when the low oil temperature shut down can be reset.
Step D: Check that the tracing systems for the oil system are operational.
Step 'E: Check the heavy fuel oil temperature. The viscosity
of
the oil at the nozzle
head'should be between 14-16 cSt. The pre-heating temperature can be de-
termined by means
of
the chart in the chapter "Viscosity-temperature chart".
2.5
Change
from
heavy
fuel
oil
operation
to
diesel
oil
operation
When the fuel supply
is
changed from heavy fuel oil operation to diesel oil operation,
the following work steps should'be carried out:
Step A: Check that oil
is
present in the diesel oil tank. Open the stop valves, which
connect the diesel oil tank to the oil system.
Step B: Select diesel oil on the manually operated three-way valve.
Step C: Check that the tracing
of
the piping system is
off
when the burner
is
in diesel
oil operation.
Caution:
Heating
of
diesel oil in the
piping
system
must
be avoided.
2.6 Change
of
heavy fuel
oil
bunker
type
If
the heavy fuel oil bunker type
is
changed and the calorific value
of
the oil changes,
the oil/air ratio should
be
checked and adjusted to obtain the correct combustion data.
For further information about adjustment
of
the oil/air ratio please see the chapter
"Commissioning".
Language
UK
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