Abstract
The most effective way of increasing the efficiency of a gas turbine based power plant is to turn it into a combined cycle plant. The most common configuration of this type involves adding a steam turbine bottoming cycle to the gas turbine. Hot gases from the exhaust of the gas turbine are used to raise steam in a heat recovery steam generator and this steam is used to drive a steam turbine. The best plants of this type can achieve an energy conversion efficiency of over 60%. More versatile combined cycle plants can be created by adding additional heating by burning more natural gas in the steam generator. A further configuration uses solar heat add to the heat in the gas turbine exhaust.
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