Different types of boilers

Types of boilers

a) Fire tube boilers
b) Water tube boilers.

a) Fire tube boilers:-.  Fire tube boilers are those boilers in which hot gases produced by the combustion of fuel in the boiler furnace, while on their way to chimney pass through a number of tubes( call did glue tubes or smoke tubes) which are immersed in water.
Heat is transferred from the hot gases to water through the walls of the tubes. Examples of fire tube boilers are Cochran boilers, locomotive boilers, etc. Fire tube boilers are also known as smoke tube boilers.

b) Water tube boilers:-  water tube boilers are those boilers in which water flow through a number of tubes( called water tubes) and the hot gases produced by the combustion of fuel in the boiler furnace, while on their way to Chimney pass surrounding the tubes, heat from the hot gases is transferred to the water through the walls of the water tubes. Examples of water tube boilers are Babcock and Wilcox, Benson boiler, etc.

Classification of the boiler:-
Basis of classification:-
Boilers are classified on the basis of the following
i)  nature of use.
ii) the relative position of water and flue gases in the boiler.
iii)  position of the axis of the boiler shell.
iv)  position of the Furnace.
v)  nature of fuels used.
vi)  nature of circulations.
vii)  number of tubes used.

i). According to the nature of use, boilers are classified as stationary boilers, locomotive boilers, Marine boilers. For a generation of thermal power and for process work( in chemical, sugar, and textile industries) boilers used are called stationary boilers. Boilers used in locomotive steam engines are called a locomotive boiler. Boilers used in steam ships are called Marine boilers. Babcock and Wilcox’s boiler is a stationary boiler.

ii). Into the relative position of the water and flue gases boilers are classified as fire tube boilers and water tube boilers. In a fire tube boiler, flue gases flow through a number of tubes and water circulation surrounding those tubes. In a water tube boiler, water flow through a number of tubes, and flue gases flow surrounding those tubes. Cochran boilers, Lancashire boiler, etc. Are fire tube boilers and Babcock and Wilcox boiler is water tube boiler.

iii)  according to the position of the axis of the boiler shell, boilers are classified as vertical boiler and horizontal boiler. If the boiler axis is vertical it is called a vertical boiler. If the boiler axis is horizontal it is called a horizontal boiler. The Cochran boiler is a vertical boiler. Lancashire boiler is a horizontal boiler.

iv). According to the position of the Furnace, boiler is classified as internally fired boiler and externally fired boilers. If the Furnace of the boiler is located inside the boiler sale it is called an internally fired boiler. When the boiler furnace is located outside the boiler it is called an externally fired boiler. Lancashire boiler is an internally fired boiler, and Babcock and Wilcox boiler is an externally fired boiler.

v)  according to the nature of fuels used boiler may be solid fuel fired, gas-fired, liquid fuel-fired, electrically fired or nuclear fuel-fired. Babcock And Wilcox boiler use solid or gas fuels. The Velox Boiler uses oil fuel.

vi)  according to the nature of circulation boilers may be of free circulation or forced circulation. Lancashire, Cochran, Babcock, and Wilcox are free circulation. Modern high-pressure boilers like Benson boiler, La Mont boiler Loeffler boiler, etc. Are off forced circulation type boilers.

vii)  according to the number of tubes boilers may be classified as single tubular boiler and multi-tubular boiler. Cornish boiler may be a single tubular boiler because it has only one fuel tube. Cochran boiler may be termed a multi-tubular boiler because it has a number of fuel tubes.

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