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Encyclopedia > Boilers

A boiler is a closed vessel in which water or other fluid is heated under pressure. The steam or hot fluid is then circulated out of the boiler for use in various process or heating applications. A safety valve is required to prevent over pressurisation and possible explosion of a boiler.


Construction of boilers is mainly limited to steel and cast iron.


Sources of heat for the boiler can be the combustion of fuels such as wood, coal, oil or natural gas. Electric boilers use resistance or immersion type heating elements. Nuclear fission is also used as a heat source for generating steam. Waste-heat boilers use the heat rejected from other processes such as gas turbines.


Boilers can also be classified into fire-tube or water-tube boilers depending on whether the fire is inside or outside. For example, steam locomotives have fire_tube boilers, where the fire is inside the tube and the water on the outside. In water-tube boilers the water flows in tubes around the fire.




See also





  Results from FactBites:
 
Boiler (509 words)
Boiler li ha incontrati per ascoltarne i differenti punti di vista e per indagare insieme forme e concetti sviluppatisi negli ultimi anni dentro e fuori il Web.
Boiler ha incontrato Mauro Ceolin in occasione dell’ultima edizione di MiArt.
Da marzo a maggio 2004 la redazione di Boiler si trasferisce negli spazi della galleria di Franco Noero in Via Mazzini 39/A a Torino per produrre il numero (finora) più ambizioso della rivista.
Boiler - LoveToKnow 1911 (8884 words)
BOILER, a vessel in which water or other liquid is heated to the boiling point; specifically, the apparatus by which steam is produced from water, as one step in the process whereby the potential energy of coal or other fuel is converted into mechanical work by means of the steam-engine.
Boilers of the latter kind must all possess certain essential features, whilst of other qualities that are desirable some may not be altogether compatible with the special conditions under which the boilers are to be worked.
It is essential that the condition of the boiler at the conclusion of the test should be precisely the same as at the commencement, both as regards the quantity of unconsumed coals on the fire-grate and the quantity of water and the steam-pressure in the boiler.
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