WNS Series horizontal Oil-fired (Gas) Boiler
-5-
to the stipulation of the item 7 of this operation manual.
Ⅲ、
Introduction for boiler structure
①
Boiler body structure
1.1The boiler heating surface is arranged as three returns structure. The horizontal and
longitudinal furnace is the first return, the front section is corrugated furnace which can
decrease the bad influence to the boiler body because of heat expansion. The smoke tube
bundle welded between front & back tube plate forms the second and the third return that can
reduce the exhaust gas temperature.
1.2 The upper part of boiler drum is steam space. In order to improve steam quality, there are
steam-water separating unit inside upper part. The middle and lower part is water space, even
at the low water level, also can insure all tubes of the highest heating surface can be immerged
into water.
1.3 The boiler front and back smoke box can be disassembled easily, so it is very convenient
for cleaning & remove ash, overhauling and maintenance.
1.4 There is fire observe hole at the back end of boiler for the convenience of check the
burning status.
1.5Boiler accessories and its function
a.
Main steam valve ---- on the top of boiler, which can transfer the steam from boiler to
steam main pipe or steam cylinder.
b.
Safety valve ---- on the top of boiler, which can discharge all the steam at full load
when the boiler is over pressure and can decrease the boiler pressure.
c.
Water level gauge and water level controller ---- on the steam
–
water interface, which
is used for boiler water level indication and for the supervision by boiler operator. The
water level controller is used for transmitting the value of boiler water level. The
control system will control the running of feeding water pump and burner emergency
stop according to the received signals.
d.
Feeding water stop valves and check valves ---- on the shell side for feeding water.
e.
Blow down valve ---- on the bottom of boiler for draining off the boiler
’
s deposition
and dirt.
f.
Gauge valve ---- on the top of boiler, to be used for connecting the instruments with
steam inside boiler.
1.6 There are necessary manhole and hand-hole on the boiler drum for the convenience of
boiler management personnel doing internal inspection.
1.7 The outside surface of boiler shell and smoke box is packed with insulation material and
cold-rolled plate.
②
Burning system
2.1 Oil-fired system
The actual working pressure should be according to the regulations of burner instruction.
2.2 Gas-fired system
The system working pressure will be confirmed according to different gas source.
2.3 Burner
2.3.1 Oil-fired burner: it is mechanical pressure type burner by the way of direct ignition,
consists of ignition transformer, ignition electrode, magnetic valve, oil gun and so on. The
wind quantity can be controlled by damper adjustment unit located the inlet position of fan. It
is permitted that the inlet oil pressure has some change at the precondition that insure
atomizing quality and oil-injection quantity, but in general condition, the oil-inlet pressure
should not less than 0.98Mpa.
2.3.2 Gas-fired burner: please refer to instruction.
③
Automatic control
The automatic control system consists of following items: water level control, pressure
