Thermal power plant & its working mechanism

  1. boiler
  2. turbine
  3. generator
  4. condenser
  5. pumps
  6. transformer
  7. switch yard
  8. coal
  9. water
  10. air

The basic working mechanism is-

  1. Use the heat energy to boil water, producing steams
  2. The steam turbine spins and then drives the electric generator
  3. Condense the steam into water for reusing
  4. Repeat the cycle

This cycle is known as the Rankine cycle:

THERMAL POWER PLANT(TPP) works on energy conversation.Let us consider coal base TPP. In coal base TPP,  coal is used as raw material to produce heat in the boiler.

All TPP works Modified RANKIN cycle

In boiler, coal is burned to produce heat. This heat is utilized to convert water in steam in a closed vessel, like a pressure cooker in the home.The boiler is a closed container with hues structure to pressurize the steam. (here the chemical is converted into heat energy)

This steam is passed through the pipe near the turbine.We make the steam pass through turbine blades and thus the turbine rotates.(here heat energy is converted into mechanical energy).

Also Read: Laws Of Thermodynamics – A Better Explanation

The turbine shaft is coupled with the generator.The shaft also rotates as the turbine rotates. Here mechanical energy is converted into electrical energy.

The electricity which we produced is connected to the grid to pass on for the use in houses, industries etc.

The steam which is passed through the turbine is condensed into water by cooling it. This condensed steam (water) is again pumped the n boiler with help of heavy pump.

As suggested by Adnan Aslam, there are other working mechanisms used in thermal power plants—open cycle, combined cycle and co-generation.

1. Open cycle-


  1. Pedakapu November 11, 2017
  2. Johanna November 15, 2017
  3. Oke Arouna January 1, 2018

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