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The history of boilers began with steam boilers that were used to power transportation, such as those seen in early trains and ships.
Early models like the “Scotch Marine” and similar early fire tube boilers were made from a steel shell with rounded tube sheets that were welded at both ends.
The boiler is like a closed vessel from which steam is used produced from the several methods like in
Fire tube: Water surrounded by a tube and Hot gas flowing in the tube and
Water tube: Hot gases surrounded by tube and Water flowing in the tube.
A boiler is a closed vessel in which fluid (generally water) is heated up to high-pressure steam.
The boilers are used in power plants, for the generation of steam.
They are mostly used in the power plants where steam turbines are used for the generation of electricity.
Fuel Used in Boilers:
I have been categorized the fuel in three formats:
1. Solid fuels:
Wood, Coal, Briquettes (a block of compressed coal dust ), Pet Coke, Rice Husk.
2. Liquid Fuels:
LDO (Light Diesel Oil), Furnace oil.
3. Gaseous Fuels:
LPG (Liquified Petroleum Gas), LNG (Liquified Natural Gas), PNG (Piped Natural Gas) can be used to carry out the combustion for a specific purpose.
Types or Classification:
According to several Purpose Like:
1. The Position of water and hot gasses:
- Fire Tube and
- Water Tube
2. Axis of Shell:
- Horizontal and
3. The position of the boiler:
- External Fired
- Internally Fired
5. Use of boilers:
6. Method of circulation:
- Natural Circulation
- forced Circulation
- Single drum
- Multi drum
8. Nature of drought:
- Forced drought
- Natural drought
9. Fuel firing:
- Solid fuel fired
- Liquid fuel-fired
- Gaseous fuel-fired
10. According to furnace
- Single furnace
- Dual furnace
Fire tube boiler:
Fire tube boiler is those boiler in which the fire or hot gas is present inside the tubes and water surrounds these fire tubes.
Since fire is inside the tubes and hence it is named as fire tube boiler. The heat from the hot gases is conducted through the walls of the tube to the water.
Water tube boiler:
Water tube boiler is those boiler in which the water is present inside the tubes and fire or hot gases surrounds these fire tubes.
Difference Between Fire Tube Boiler and Water Tube Boiler:
|SL NO||FIRE TUBE BOILER||WATER TUBE BOILER|
|1.||Hot flue gases flow inside the tube and the water outsides the tubes.||Water flow inside the turbine and hot flue gases outside the tube.|
|2.||These boilers are generally internally fired.||These boilers are generally extra really fired.|
|3.||The boiler pressure limited to 20 bar.||The boiler pressure is limited up to 100 bar.|
|4.||Fire tube boiler has a lower rate of steam production.||A higher rate of steam production.|
|5.||Not suitable for larger power plants.||Suitable for larger power plants.|
|6.||Involves lesser risk of explosion due to low pressure.||Risk of the explosion is higher due to high boiler pressure.|
|7.||For a given power, it occupies large floor space.||For a given power, it occupies small floor space.|
|8.||This boiler is difficult to construct.||Simple in construction.|
|9.||Difficult in transportation.||Simple in transportation.|
|10.||They require less skill to operate, as compare to the water tube boiler.||They required a skilled operator.|
|11.||They are difficult to repair and cleaning as they are internally fired.||They are easy to repair and clean as they are externally fired.|
|12.||They required a large shell diameter. Because the firetube situated inside the shell.||They required a small shell diameter.|
|13.||The efficiency of the fire tube boiler is less as compared to the water tube boiler.||The efficiency of the water tube boiler is more.|
|14.||The maintenance of this boiler is costly. It requires regular inspection.||They are easy to maintain as they are externally fired.|
|15.||Ex: Cornish Boiler, Lancashire Boiler.||Ex: Babcock and Wilcox Boiler.|
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