Today I am
going to tell you about Lamont boiler. Lamont boiler is the first forced convection
boiler which is introduce in the year 1925. A water circulating pump is used in
the boiler to circulate water inside the boiler. This pump is driven by the steam
turbine which uses steam of boiler. It is used in power plant
industries to generate electricity.
Lamont Boiler:
Principle:
This boiler works on basic principle of
forced convection. If the water is circulate by a pump inside the tube, the
heat transfer rate from gas to the water is increases. It is the basic
principle of it.
Construction:
This boiler
is the first force circulation boiler. This boiler consist various part which
are as follow.
Economizer:
Economizer use
to preheat the water by using remaining heat of the combustion gases. It increases
the boiler efficiency. The feed water first supplied to the economizer before
entering to the boiler.
Centrifugal pump:
The Lamont
boiler is a force convection boiler. So a centrifugal pump is used to circulate
water inside the boiler. This pump is driven by a steam turbine. The steam for
the turbine is taken by the boiler.
Evaporator tube:
The
evaporator tube or can say water tubes are situated at furnace wall which
increase the heating surface of boiler. This is also at the up side and down
side of the furnace and other equipment. The main function of these tubes to
evaporate water into steam. This also
cools down the furnace wall.
Grate:
The space in
the furnace where the fuel is burn is called grate. It is bottom side of furnace.
Furnace:
In the Lamont
boiler vertical furnace is used. The main function of Furnace is to burn the
fuel.
Super heater:
The steam
generated by the evaporator tube is saturated steam. If it directly used in steam
turbine can cause the corrosion. So the saturated steam sends to the super
heater where it can increase the temperature of steam.
Water steam separator drum:
The steam separator
is situated outside from the boiler. The mixture of water and steam from the evaporator
tube send to the steam separator where it separate the steam and send it to super
heater. The remaining water again sends to the economizer.
Air preheater:
It’s main
function to preheat air before entering into furnace.
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Working:
Lamont
boiler is a forced circulation, internally fired water tube boiler. The fuel is
burn inside the boiler and the water is circulating by a centrifugal pump through
evaporator tubes. The working of this boiler is as follow.
A feed pump
forces the water into the economizer where the temperature of water increases. This water forced
into the evaporator tube by using a centrifugal pump driven by steam turbine.
Water passes 10 - 15 times into the evaporator tube. The mixture of saturated
steam and water is formed inside the tube.
This mixture
sends to the steam separator drum which is outside the boiler. Steam from
the separator sends to the super heater, where the saturated steam converts
into superheated steam. The water again
sends to the economizer where it again passes by the evaporator tubes.
The air from
the air preheater enter into the furnace where fuel burn. The flue gases first heat
the evaporator tube then passes by the super heater. These gases from the super
heater again use to preheat the air into air preheater before exhaust into
atmosphere.
This working
pressure of this boiler is above 170 bar and have the steam generation capacity
of about 50000 kg/hour at temperature 773 K .
Advantages:
1. It can high
pressure boiler.
2. It is
flexible in design.
3. This boiler
can reassemble in natural circulation boiler.
4. It can
easily start.
5. It has high steam
generation capacity of about 50 ton/ hour.
6. This boiler
has higher heat transfer rate.
Today we have learnt about Lamont boiler. If you have any query regarding this boiler, ask by commenting.