high pressure boilers & accessories_151904_power plant engineering

8/9/2019 High Pressure Boilers & Accessories_151904_Power Plant Engineering

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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.


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


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.+


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>.

#prepared by Prof. Jagdish S.

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


Talpada


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&ancashire Boiler contd>>


Talpada


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&ancashire Boiler contd>>


Talpada


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&ocomotive Boiler Is an internall! fired multitubular fire tube boiler


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.


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


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+

1#prepared by Prof. Jagdish S.

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


Talpada


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&oeffler Boiler Indirect heating is combined with forced circulation


Talpada


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(elo" boiler -ire tube forced circulation Boiler


Talpada


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LECTURE - 4


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.


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


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

high pressure boilers & accessories_151904_power plant engineering

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