Post on 01-Jun-2018
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High Pressure Boilers &
AccessoriesPrepared By
Prof. Jagdish S.Talpada
Assistant Professor,
Mechanical Engineering Departent,DJM!T, Mogar
"#"$% ' P()E* P+AT E-!EE*!-
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LECTURE - 1
2prepared by Prof. Jagdish S.
Talpada
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Industrial Boilers Steam generators Closed vessels made of steel and used for generation of steam vaporizing water combustion of fuels eg. coal,coke,oil,wood,saw dust and begesse etc.
Steam used for producing power,for industrialprocess work or for heating proposes.
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Talpada
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Requirements of a erfect
Steam Boilers Should be absolutel! reliable,capable of producing
ma"imum steam at required pressure for minimum offuel consumption,with minimum attention and minimum
initial cost and operating cost. Simple constructions
#uick starting from cold
Strong enough against temp. stress $ strains
%ell design combustion chamber
&ess floor area, space $ light weight
Best gauges,safet! valves and other mountings
'asil! accessible for inspection,cleaning and repairs
4prepared by Prof. Jagdish S.
Talpada
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Classification of Steam
Boilers (ertical or )orizontal Stationar!*ower plant,industrial,central heating and combined
power and heating boilers.+,ortable,&ocomotive or arine Internall! -ired or '"ternall! -ired *&ancashire and &ocomotive
Boilers+ Solid,&iquid or as -ired -ire*Smoke+/ube0%ater is outside the tubes while the hot gases are
inside the tubeseg.(ertical,Cochran,&ancashire,Cornish,&ocomotives,etc+ or %ater/ube0 Contain a large number of small tubes through which watercirculates,the fire and hot gases being outside of thetubes.eg.Babcock and %ilco", Stirling and )igh pressure Boilersetc.+
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Talpada
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(ertical Boilers 1sed in small factories,small water suppl!
plants,cranes,e"cavators,winch engines inmines and on sites of temporar! nature suchas construction work etc.
Required minimum floor space,not requiredelaborate foundations,and is portable.
Cheap,eas! to start but inefficient due to largewastage of fuel and less heating surface.
(ertical Boilers are0Simple*having one to threecross tubes+, fire tubes and water tubes t!pes.
prepared by Prof. Jagdish S.
Talpada
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Simple Cross tube vertical
boiler consists of a c!lindrical shell surrounding a c!lindrical fire bo".
heating surface is about 2345 times the grate area.
657 efficienc!
!prepared by Prof. Jagdish S.
Talpada
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Cochran Boiler It is well design of a (ertical multitubular fire tube boiler
Improvement over the simple vertical boiler as itprovides greater heating surface.
/otal heating surface area is about 45386 times thegrate area
'fficienc! 953967
Ranges from 4m dia.:8m high,evaporation 85kg;hr to
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Cochran Boiler contd>.
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Talpada
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&ancashire Boiler Is horizontal smoke tube boiler size range from
a shell 8m dia:=m long to
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LECTURE - 2
11prepared by Prof. Jagdish S.
Talpada
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&ancashire Boiler contd>>
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Talpada
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&ancashire Boiler contd>>
13prepared by Prof. Jagdish S.
Talpada
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&ocomotive Boiler Is an internall! fired multitubular fire tube boiler
14prepared by Prof. Jagdish S.
Talpada
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Babcock and %ilco" water
tube Boiler %ater tube boiler having lager pressure ranges and
larger sizes.
/hree main parts, steam and water drum,water tubes
and furnace.
15prepared by Prof. Jagdish S.
Talpada
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Stirling Boiler '"ample of water tube boiler where bent tube are used
instead of straight tube which are used in Babcock and %ilco"boiler
1prepared by Prof. Jagdish S.
Talpada
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LECTURE - 3
1!prepared by Prof. Jagdish S.
Talpada
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)igh ressure Boilers /wo t!pes3 @atural circulation $ -orced circulation
Boilers
1"prepared by Prof. Jagdish S.
Talpada
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)igh ressure Boilers
contd>>> &a3ont Boiler* -orced circulation Boiler+
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Talpada
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Ance3/hrough -orced
Circulation Boiler oes not required a steam and water drum,saving in weight
Supercritical ressure Boiler
/wo t!pes3 Benson and Ramzin
2$prepared by Prof. Jagdish S.
Talpada
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Ramzin Boiler
21prepared by Prof. Jagdish S.
Talpada
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&oeffler Boiler Indirect heating is combined with forced circulation
22prepared by Prof. Jagdish S.
Talpada
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(elo" boiler -ire tube forced circulation Boiler
23prepared by Prof. Jagdish S.
Talpada
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LECTURE - 4
24prepared by Prof. Jagdish S.
Talpada
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-ire tubes (s water tubes
Boilers -ire tubes boilers has a large volume of water,therefore more
fle"ible and can meet the sudden demand of steam withoutmuch drop of pressure.
-ire tubes boiler is rigid and of simple mechanical
construction,so greater reliabilit! and low in first cost. -ire tube boilers can be made in smallest sizes therefore simple
to fabricate and transport, occupies less floor space but moreheight.
ue to mostl! e"ternall! fired water tubes boiler so furnacecan be altered considerabl! to meet the fuel requirements.
%ater tubes boilers are more readil! accessible forcleaning,inspection and repairs,compared to the fire tubeboilers.
odern trend is in the favors of water tube boiler due tocontinuous increase in capacities and steam pressures.
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Talpada
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Boiler ountings and
ccessories -itting and devices which are necessar! for the safet!
and control are knows as boiler mountings
-itting or devices which are provided to increase the
efficienc! of the boiler and help in the smooth workingof the plant are knows as boiler accessories.
Fittings which are essential from thesafety point of view are as follows,
%ater level indicators
Safet! valves
Combined high steam and low water safet! valve
-usible plug
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Talpada
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Boiler ountings and
ccessories contd>. Fittings which are essential from the
control point of view are as follows, ressure gauge
Dunction or stop valve -eed check valve Blow3off cock an hole and ud Bo"
The important accessories are Superheater 'conomiser ir3preheater -eed pump or inEector
2!prepared by Prof. Jagdish S.
Talpada