02-08-2014, 04:52 PM
BOILERS
BOILERS.pptx (Size: 279.61 KB / Downloads: 24)
What is Boiler?
It is a device in which thermal energy released by combustion of fuel is used to make steam at the desired temperature and pressure.
Need Of Steam
The steam produced is used for:
Producing mechanical work by expanding it in steam engine or steam turbine.
Heating the residential and industrial buildings
Performing certain processes in the sugar mills, chemical and textile industries.
Efficiency
Should be able to absorb a maximum amount of heat produced due to burning of fuel in the furnace.
It should be simple in construction .
Its initial cost and maintenance cost should be low.
The boiler should have no joints exposed to flames.
Should be capable of quick starting and loading.
Advantages
The feed pipe projecting into the boiler is perforated to ensure uniform water distribution.
Its heating surface area per unit volume at the boiler is considerably large.
Its maintenance is easy.
It is suitable where a large reserve of hot water is needed. This boiler due to the large reserve capacity can easily meet load fluctuations.
Super-heater and economizer can be easily incorporated into the system, therefore; overall efficiency of the boiler can be considerably increased (80-85%).