submitted by :-
Suhail ahmad mansoori

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INTRODUCTION
A boiler is an enclosed vessel that provides a means for combustion heat to be transferred into water until it becomes heated water or steam. The hot water or steam under pressure is then usable for transferring the heat to a process. Water is a useful and cheap medium for transferring heat to a process. When water is boiled into steam its volume increases about 1,600 times, producing a force that is almost as explosive as gunpowder. This causes the boiler to be extremely dangerous equipment that must be treated with utmost care. The process of heating a liquid until it reaches its gaseous state is called evaporation. Heat is transferred from one body to another by means of (1) radiation, which is the transfer of heat from a hot body to a cold body without a conveying medium, (2) convection, the transfer of heat by a conveying medium, such as air or water and (3) conduction, transfer of heat by actual physical contact, molecule to molecule.
The heating surface is any part of the boiler metal that has hot gases of combustion on one side and water on the other. Any part of the boiler metal that actually contributes to making steam is heating surface. The amount of heating surface of a boiler is expressed in square meters. The larger the heating surface a boiler has, the more efficient it becomes. The quantity of the steam produced is indicated in tons of water evaporated to steam per hour.
A boiler is an important part of any thermal power plant. The boiler used in the Jojobera Power Plant is the water tube boiler. The Jojobera Plant works on the modified form of the Rankine Cycle. Boiling and subsequent steam generation is the basic function of the boiler. The proper functioning of the boiler is possible with the help of a furnace, boiler drum, water walls, super heaters, reheater, economiser, down comers, draft system & necessary control valves. Steam generator is radiant reheat, wet bottom, natural circulation, single drum, direct corner fired, tilting burners, balanced draft, top supported type boiler.