Classifications of Steam Boilers:
Though there are many classifications of steam boiler, yet the following are the important from the subject point of view:
(i) Fire tube Boiler: A boiler in which the hot combustion gases pass through the boiler tubes, which are surrounded by water. e.g. Lancashire boiler, Cochran boiler, Locomotive boiler etc.
(ii) Water tube Boiler: A boiler in which the water flows a number of small tubes which are surrounded by hot combustion gases. e.g. Babcock and Wilcox boiler, Stirling boiler, Bension boilers etc.
(i) Internally fired boiler: In internally fired steam boilers, the furnace is located inside the boiler shell. Most of the fire tube boilers are internally fired.
(ii) Externally fired boiler: In externally fired steam boilers, the furnace is arranged underneath in a brick work setting. Water tube steam boilers are always externally fired.
➦ According to the axis of the shell
(i) Vertical boilers: In vertical steam boilers, the axis of the shell is vertical. Simple vertical boiler and Cochran boiler are vertical boilers.
(ii) Horizontal boilers: In horizontal steam boilers, the axis of the shell is horizontal. Lancashire boiler, Locomotive boiler and Babcock and Wilcox boiler are horizontal boilers.
(i) Single tube boilers: In single tube steam boilers, there is only one fire tube or water tube. Simple vertical boiler and Cornish boiler are single tube boilers.
(ii) Multitubular boilers: In multitubular steam boilers, there are two or more fire tubes or water tubes. Lancashire boiler, Locomotive boiler, Cochran boiler, Babcock and Wilcox boiler are multitubular boilers.
(i) Natural circulation boilers: the circulation of water is by natural convection currents, which are setup during the heating of water. In most of the steam boilers, there is a natural circulation of water.
(ii) Forced circulation: there is a forced circulation of water by a centrifugal pump driven by some external power. Use of forced circulation is made in high pressure boilers such as La-Mont boiler, Bension boiler, Loeffler boiler and Velcon boiler.
(i) Stationary boilers: The stationary boilers are used in power plants and in industrial process work.
(ii) Mobile boilers: The mobile boilers are those which move from one place to another place. These boilers are Locomotive boilers.
(i) Solid fuel
(ii) Liquid fuel
(iii) Gaseous fuel
(iv) Electrical energy
(v) Nuclear energy
Nice post...Steam boiler manufacturers India
ReplyDeleteIndustrial Steam boiler
Thermic Fluid Heater