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Steam ________ is a device in which the exhaust steam from engines and turbines is condensed and air and other non-convertible gases are removed in a continuous process.
1. Superheater
2. Economizer
3. Condenser
4. None of the above

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Correct Answer - Option 3 : Condenser

Condensers:

A condenser is a device that condenses the steam at the exhaust of the turbine. It serves two important functions.

  • By liquidating steam at the exhaust of the turbine, a region of emptiness is created.
    • This results in very low pressure at the exhaust of the turbine.
    • This permitting expansion of the steam in the prime mover to very low pressure.
    • This helps in converting the heat energy of steam into mechanical energy in the prime mover.
  • The condensed steam can be used as feed water to the boiler.


Superheater:

  • A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam
  • Superheated steam is used in steam turbines for electricity generation, steam engines, and in processes such as steam reforming
  • While the temperature of the steam in the superheater rises, the pressure remains the same as that of the boiler.


Economiser:

  • An economiser is a mechanical device that is used as a heat exchanger by preheating a fluid to reduce energy consumption.
  • In a steam boiler, it is a heat exchanger device that heats up fluids or recovers residual heat from the combustion product i.e. flue gases in a thermal power plant before being released through the chimney.
  • Economiser is situated before air pre-heater in the flue gas path. 
  • Economiser increases the efficiency of the power plant.

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