A combined cycle power plant is more efficient than a conventional power plant as a result of it uses a higher proportion of the energy that the fuel produces when it burns.
In a combined cycle power plant (CCPP) a gas turbine produce electricity and therefore the waste heat is employed to create steam to get additional electricity through a steam turbine.
This last step improves the potency of electricity generation.
The gas turbine drives associate electrical generator. The gas turbine exhaust is then used to produce steam in a heat exchanger (steam generator) to supply a steam turbine whose output provides the means that to get more electricity.
However the Steam Turbine is not essentially in that case the plant produce electricity and industrial steam which can be used for heating or industrial purpose.
It has been found that a substantial amount of heat energy goes as a waste with the exhaust of the gas turbine.
This energy should be utilized. The complete use of the energy accessible to a system is termed the overall energy approach.
The objective of this approach is to use all of the heat energy in a power system at the various temperature levels at which it becomes accessible to produce work or steam or the heating of air or water thereby rejecting a minimum of energy waste.
Even nuclear power plant is also utilized in the combined cycles. The exhaust of gas turbine which has high oxygen content is used as the inlet gas to the steam generator where the combustion of additional fuel takes place.
This combination allows nearer equality between the power outputs of the two units than is obtained the recuperative heat exchanger.
For a given total power output the energy input is reduced and the installed cost of gas turbine per unit of power output is about one-fourth of that of steam turbine.
In other words, the combination cycles exhibit higher potency. The greater disadvantages include the complexity of the plant, different fuel requirements and possible loss of flexibility and reliability.
The system is efficient and the cost of power production per kW is less.
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