Which of the following units requires a boiler, a superheater, an economizer, and an air preheater?
Right Answer is:
Steam generating unit
SOLUTION
The steam generating plant consists of a boiler, superheater, and economizer for the production of steam and other auxiliary equipment for the utilization of flue gases.
Boiler: The heat of the combustion of coal in the boiler is utilized to convert water into steam at high temperatures and pressure.
Superheater: The steam produced in the boiler is wet and is passed through a superheater where it is dried and superheated by the flue gases on their way to the chimney.
Economizer: An economizer is essentially a feedwater heater and derives heat from the flue gases for this purpose. The feed water is fed to the economizer before supplying to the boiler.
Air preheater: An air preheater increases the temperature of the air supplied for coal burning by deriving heat from flue gases.
Steam turbine: The dry and superheated steam from the superheater is fed to the steam turbine through the main valve.