T o light F uel gas main burner T o operate draft gauge
The fuel gas main burner is only a big
pilot. Follow the same procedure to
light it. The only difference is that you
do not need a separate light since the
pilot burner is just there to serve you.
However, there are secondary air registers
to regulate the oxygen air requirement
for burner and pip-hole to view the flame
status. 1. Adjust the draft gauge to give you the
pressures you need across the heater by
regulating the reading on the indicator.
The gauge scale graduated in millimeters
(mm) or water.
T o light fuel oil main burner
Understanding the fuel gas burner is not
enough to light a fuel oil burner because
there are a lot of differences. Features like
atomizing steam two inlets to burner (
one for steam and the other for oil) etc
that we need to be familiar with.
Drain all condensate from the steam lines
first
1. Crack open the atomizing steam to the
burner nozzle to purge nozzle tip.
2. Crack open the fuel oil valve to
commission the oil flow to burner nozzle
making sure that the steam flow is slightly
more than the oil flow. With the pilot
already lit the oil will immediate ignite.
3. Let the fuel oil pressure differential
be within the set limit. Maintain fuel oil
circulation at all time.
4. Throttle the two valve together until
the required flame achieved.
5. Adjust the secondary air register to
regulate the flame color.
2. Keep the pressure of the heater
radiation section on the slight positive
side say 2-5mm of water.
3. Keep the pressure of heater convection
section on the slight negative side, say
2-5mm of water.
4. Above convection section should
be more negative while the below
convection section a little above zero.
Just note that the pressure should
be such that a little vacuum surge or
pressure differential is created to provide
the driving force necessary for effective
pressure control.
T o set stack damper
The stack damper is like the chimney of
the kitchen where flue gas escapes to the
atmosphere. So be careful not to loose off
the heat you generated before using it.
For efficient heater performance keep the
damper at 60% opening.
1. Adjust the damper opening by hand
turning the handle across the scale of the
damper. The scale is mostly graduated in
percentage of the damper opening.
2. Keep the setting initially at 30% and
gradually raise it to 60%. This is mostly
applicable to atmospheric heaters.
T o soot blow heater tubes
Soot blowing is the removal of carbon
deposits and ash on the surface of heater
tubes and on the flue gas passages
which result from fuel combustion.
Heater soot-blow could be carried out
manually or automatically depending
on the provision. Heater tubes are blown
with steam. Let us look at the basic
requirement needed to soot-blow heater
tubes from deposits of carbon that results
from fuel combustion.
1. Check and drain any condensate from
the steam line.
2. Hand turn the blower shaft to free it
from stiffness.
3. Inform the panel man/ chief operator
your readiness to begin soot- blowing.
4. Open the damper a little above normal
to allow quick relief of soot through the
stack.
5. Develop your sequence steps if blower
is on manual mode.
6. Advance the soot blower following the
sequence developed one after the other.
7. Isolate the steam and return the
damper setting to the position after the
soot-blowing operation.