What is Combined Cycle:
The process for converting the energy in a fuel into the electric power involves the creation of mechanical work, which is then transformed into the electric power by a generator. The overall efficiency of the conversion depending on the type of fuel and the thermodynamics process used & it can be as low as 30%.
To increase the overall efficiency of a electric power plants, multiple thermodynamic processes can be introduced or combined to recover and utilize the residual heat energy in hot exhaust gases. By the using combined cycle, power plants can achieve the electrical efficiency up to 60%.
The terms “combined cycle” refers to the combining of multiple thermodynamic cycles to generate electric power. Combined cycle operation uses a heat recovery steam generator (HRSG) that captures the heat from high temperature exhaust gases to produce steam, which is then supplied to a steam turbine to generate additional electric power. The process for creating steam to produce work using a steam turbine is based on the Rankine cycle.
The most common type of combined cycle power plant utilizes gas turbines and is called a combined cycle gas turbine (CCGT) plant. Because gas turbines have low efficiency in simple cycle operation and the output produced by the steam turbine accounts for about half of the CCGT plant output.
The process for converting the energy in a fuel into the electric power involves the creation of mechanical work, which is then transformed into the electric power by a generator. The overall efficiency of the conversion depending on the type of fuel and the thermodynamics process used & it can be as low as 30%.
To increase the overall efficiency of a electric power plants, multiple thermodynamic processes can be introduced or combined to recover and utilize the residual heat energy in hot exhaust gases. By the using combined cycle, power plants can achieve the electrical efficiency up to 60%.
The terms “combined cycle” refers to the combining of multiple thermodynamic cycles to generate electric power. Combined cycle operation uses a heat recovery steam generator (HRSG) that captures the heat from high temperature exhaust gases to produce steam, which is then supplied to a steam turbine to generate additional electric power. The process for creating steam to produce work using a steam turbine is based on the Rankine cycle.
The most common type of combined cycle power plant utilizes gas turbines and is called a combined cycle gas turbine (CCGT) plant. Because gas turbines have low efficiency in simple cycle operation and the output produced by the steam turbine accounts for about half of the CCGT plant output.
Working Principles:
The following steps are carried out in combined-cycle plants to produce electricity and captures the wastage heat from the gas turbine to increase efficiency and electrical output.
- Gas turbine burns fuel (gas)
- The gas turbine compressed the air and mixed it with fuel that is heated to a very high temperature. Then the hot air-fuel mixture moves through the gas turbine blades, making them spin.
- The fast-spinning of turbine drives a generator that converts a portion of the spinning energy into electricity.
- Heat recovery system captures exhaust (HRSG)
- A Heat Recovery Steam Generator (HRSG) captures the exhaust heat energy from the gas turbine that would otherwise escape through the exhaust stack/ chimney.
- The HRSG helps to creates steam from the gas turbine exhaust heat and it delivers to the steam turbine.
- Steam turbine delivers additional electricity
- The steam turbine sends its energy to the generator drive shaft, where it is converted into additional electricity.
Dear sir, As environmentalist contributor I write articles about the Natural Environments depletions. I have red your article about CCGT which are mostly used here in Spain. I wonder wheather I could reproduce one related scheme in my blog page. Best regards
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