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Simple Vertical Boiler

Presentation By:Prakash Thakor

Kalpesh Dodiya,Ruban Saroj

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Consists of a cylindrical shell surrounding a cylindrical fire box.Heating surface is about 8-10 times the grate area.50% efficiency

Simple Cross tube verticalboiler

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The shell is vertical and it attached to thebottom of the furnace. Greater portion ofthe shell is full of ater hich surrounds thefurnace also. Remainin! portion is steamspace. The shell may be of about ".#$metres diameter and #.% meters hei!ht.

Cylindrical shell

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&ne or more cross tubes are either rivetedor 'an!ed to the furnace to increase theheatin! surface and to improve the atercirculation.

Cross-tubes

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Furnace (or fre box):(ombustion of coal takes place in the furnace )*re

bo+ .

rate:

-t is placed at the bottom of *re bo+ and coal is fed on

it for burnin!.

Fire door:(oal is fed to the !rate throu!h the *re door.

Chimney (or stac!): The chimney )stack passes from the top of the *rebo+throu!h the top of the shell.

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"anhole:-t is provided on the top of the shell to enable a manto enter into it and inspect and repair the boiler frominside it. -t is also, meant for cleanin! the interior ofthe boiler shell and e+terior of the combustionchamber and stack )chimney .

#and holes: These are provided in the shell opposite to the ends ofeach cross tube for cleanin! the cross tube.

$shipt:-t is provide for collectin! the ash deposit, hich canbe removed a ay at intervals.

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The fuel )coal is fed into the !rate throu!h the *re holeand is burnt. The ashpit placed belo the !rate collect theashes of the burnin! fuel.

The combustion !as 'o s from the furnace, passes aroundthe cross tubes and escapes to the atmosphere throu!hthe chimney.

ater !oes by natural circulation due to convectioncurrents, from the lo er end of the cross tube and comes

out from the hi!her end.

The orkin! pressure of the simple vertical boiler does note+ceed /% 01cm2#.

%or!in&

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Pressure &au&e 3 it indicates the pressure ofthe steam inside the boiler.

%ater &au&e (' ater level

indicator): this indicates the ater level inthe boiler.Sa*ety valve: it prevents an increase of

steam pressure in the boiler above its

desi!n pressure.Steam stop valve: it re!ulates the 'o of

steam supply to re5uirements.

+he *ollo in& mountin&s are ftted in the boiler:

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Required minimum floor s ace!notrequired elaborate foundations!and is

ortable.

Chea !easy to start but inefficient due tolarge "astage of fuel and less heatingsurface.#ertical $oilers are &im le'ha(ing one to

three cross tubes)! fire tubes and "atertubes ty es.

$dvanta&es o* VerticalBoilers

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Uses of Vertical Boilers

*sed in small factories!small "ater su lylants!cranes!exca(ators!"inch engines in mines

and on sites of tem orary nature such asconstruction "or+ etc.

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+han!in& ,ou