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from jay singh chauhan& digvijay badonia,clg-aitr bhopal


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A closed vessel made up of steel to transfer heat produced by combustion of fuel to water and ultimately generate steam . It works at low to medium pressure. Definition

Requirements of an boiler:

Requirements of an boiler Generate maximum steam. Light in weight and not occupy large space. Proper safety regulations. Cheaper in cost. Easy cope up with fluctuating demands of requirements. Easily accessible for inspection and repair.


FUEL The source of heat for a boiler are : WOOD COAL DIESEL NATURAL GAS NUCLEAR ENERGY

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Boiler shell Combustion chamber Furnace Grate Heating surface Mounting Accessories

Boiler mountings :

Boiler mountings Pressure Gauge Water level indicator Safety valve Fusible plug Blow of cock Steam stop valve Feed check valve

Boiler Accessories:

Boiler Accessories Air preheater : It utilize the heat of exhaust gases. Economizer: Heat is used to raise the temperature of feed water supplied to the boiler. Steam super heater: Used to super heat the steam. Feed pump: Raise the pressure of water and force it into the boiler. Injector: Used to feed water in boilers.

 :  Classification of boilers:

: Classification of boilers Water tube Fire tube High Externally Natura l Forced Low Internally

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Types of Boiler 1 .Fire tube boiler

2-Water tube boiler:

2-Water tube boiler * La-Mont boiler * Babcock and Wilcox boiler. 2.Water tube boiler 3-High pressure boiler

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. A high pressure, drum less, water tube steam boiler works on forced circulation. . Feed water enters at one end and discharge superheated steam at the other end. . Feed pump increase pressure of water to supercritical pressure. . Water directly transforms into steam without boiling . BENSON BOILER

Working of Benson boiler:

Working of Benson boiler * Feed water passes through economizer to water cooled walls of the furnace. * Water receives heat by radiation ,the temperature rises to critical temperature . * It then enters the evaporator and may get superheated to some degrees. * Finally passed through the superheater to obtain desired superheated steam.

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Advantages of Benson boiler 1- Steam is directly obtained without boiling. 2- Initial cost is low, as there is no water and steam drum. 3- Since there is no limit ,thus supercritical pressure may be employed. 4- Quick start ( within 15 min.) and increased heat transfer rate. 5- Light in weight. 6- Thermal efficiency 90%.

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The steam produced may be supplied : To an external combustion engine ,i.e., a steam engine and turbine. As a high pressured steam is a good source of energy it can be also used. At low pressure used in many industries like cotton mills, sugar factories, breweries, etc. Used for producing hot water further used for heat installation at low pressure. Modern applications of Benson boiler

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Boiler efficiency Ratio of heat actually utilized in the generator to the heat supplied by the fuel. Efficiency= m a ( h – h f )/c Where, C is the calorific value of the fuel.

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Conclusion The Steam Generators are one of the efficient part in any industries which effect CHRONICALY in ASCEND and DESCEND in any industrial line… Thus we must take the awareness about the STEAM GENERATORS …

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Thank you

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