Cornish boiler is a simple horizontal boiler which belong to
the shell and tube class of boilers. Cornish boiler is much like the Lancashire
boiler. Cornish boiler has the ability to produce steam at the rate of 1350 kg/hr
and can take the maximum pressure of about 12 bar. Dimensions of the Cornish
boiler shell is 4 m to 7 m in length and 1.2 m to 1.8 m in diameter. Cornish
boiler is a fire tube type of boiler that is hot gases flow in tubes and water
surround these tubes in shell.
Parts of Cornish boiler
Tubes
These are present inside the shell and hot gases flow
through them.
Shell
A big shell which contain water inside it as well as tubes.
Heat transfer between hot gases and water is take place here
Side flue
Flue are the tubes which take hot gases after they passes
out from the fire tubes. Flue present at side of the horizontal shell are
called side flues.
Bottom flue
Flue present at the bottom of the shell is called bottom
flue. Bottom flue take the smoke toward the chimney.
Grate
Grate is the place where fuel is added for burning.
Ash pit
Ash pit the one which contain the ashes of fuel aster they
are completely burn.
Chimney
Chimney take smoke from the bottom flue and take it out to
the atmosphere.
Stop valve
It is used to regulate the flow of steam from boiler
Safety valve
Purpose of this valve is to stop the steam pressure from
exceeding the maximum limit
Blow of cock
Blow of cock is used to clean boiler by discharging the
water and sediments from bottom of boiler
Working of the Cornish boiler
Fuel is added in the grate area where it burn to produce hot
gases. There hot gases move into the fire tube which take it inside the shell
where it exchange its heat with surrounding water. Water take heat and after
some time it start boiling to produce steam. Hot gases upon reaching at the end
of the fire tube, divided into two section and each move into the one of two
side flue which take them once again at the front section of the boiler where
they are move into the bottom flue and bottom flue take them toward the
chimney. Chimney throw these gases out of the boiler into the atmosphere. In
this process hot gases travels complete length of boiler thrice that is once in
fire tube then in side flue and at last bottom flue. Maximum heat transfer is taken place at fire
tube and shell section then taken place at side flue and at last at bottom
flue.
Application of Cornish boiler
- Cornish boiler are used in many industries like textile, sugar, paper, tyre, chemical etc
- They are also used to produce steam to run steam turbine
- They are also used in many marines
Advantages of Cornish boiler
- Cornish boiler have simple design and easy construction
- One of its main advantages is its Compactness and Portability
- Low construction and maintenance cost
- It has ability to overcome load fluctuation
Disadvantages of Cornish boiler
- Low steam production rate = 1350 kg/hr
- Low maximum steam pressure range 12 bar
- Need more ground because of horizontal structure
you should mention its characteristics such such as single tube boiler, low pressure horizontal etc. this would really help understand better
ReplyDeleteThank's for recommendation. We will work o this and update the article the soon.
DeleteREALLY FANTASTIC...HELPED ALOT
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