boiler aads
TRANSCRIPT
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BOILER & ITS
AUXILIARIES
A TECHNICAL PROJECT REPORT
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Contents-
Introduction
Three generations of boiler
Types of boiler
Principle of steam generation
Various pressure parts of boiler
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INTRODUCTION
Steam generation is the process of
converting water into steam.
STEAM GENERATOR:
It is a complex combination of economizer, boiler drum, super
heater, reheater & air pre heater. In addition it has various
auxiliaries, such as stokers, pulverizes, burners, fans, emission
control equipment, stack & ash handling equipment.
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Three Generations of Boiler
Shell type boiler
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contd
Fire tube boiler
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contd
Water tube boiler
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Types of Boiler
Depending on application there are 3 types of
boiler- Utility or power boilers
Industrial boilers Others (Boiler used for locomotive steam
engines, Marine boilers etc.)
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PRINCIPLES OF STEAM GENERATION
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Various pressure parts of Boiler
The various pressure parts of the boiler is
as follows,
1)Economiser.
2)Boiler Drum.
3)Super Heaters.
4)Reheater.
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ECONOMISER:- Economizer are provided to extract the
heat from flue gases & add it as either sensible heat alone or
sensible heat & latent heat to the feed water . Basically it is
nothing but a tube-&-shell type heat exchanger.
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BOILER DRUM :-The drum is found in that type of boiler which
operated under sub-critical pressure. They are used to separate
the steam from saturated liquid & vapour mixture. Generally it
supply dry steam to the super heater bubble less water to the
down comer
The functions of the boiler drum as follows,
1)To provide the necessary space for separation of steam from mixture of steam& water.
2)To house the equipment needed for purification of steam after separation fromsteam-water mixture.
3)To provide a water storage for preventing the starvation of tube.
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SUPER HEATER
Super heatersare providedinthe boilertoraisethesteamtemp.
abovethesaturationtemp. by absorbing heat fromthe fluegas
CLASSIFICATION ACCORDING TO THE MODE OF HEAT TRANSFER
According to the mode of heat transfer the super heaters can be classified asfollows,
a) Radiant super heater.
b) Convective super heater.
CLASSIFICATIONACCORDING TO POSITION & SHAPE:
1.Platen Super heater
2.Horizontal Super heater
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REHEATERS:- Reheatersare usedtoraisedthetemp. of
thesteam comingout fromtheoutletofthe H.P turbine
toitssuper heatedtemp. at constant pr. tosupply super
heatedsteamtothe I.P andthento L.P turbine.
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THE END
PRESENTED BY-
ARITRA ROY
ATINDRA MANDAL
SATADRU CHAKRABORTY
DEBAPRASAD MONDAL