VODOLEY system is a steam injection system, which is known as a self-sufficient one in steam production. The amount of water vapor in combustion products will become regenerated in a contact condenser and after passing through a heat recovery boiler is injected in the transition piece after combustion chamber. In this paper the influence of steam injection in Mashad Power Plant GE-F5 gas turbine parameters, applying VODOLEY system, is being observed. Results show that in this turbine, the turbine inlet temperature (TIT) decreases in a range of %5 to %11 depending on ambient temperature, so the operating parameters in a gas turbine cycle equipped with VODOLEY system in 40º C of ambient temperature is the same as simple gas turbine cycle in 10º C of ambient temperature. Also, results show that thermal efficiency increases up to %10, but Back-Work ratio increases in a range of %15 to %30. Injected steam also reduces NO x formation during the combustion process. In this paper result of experimental investigation of Mashad Power Plant GE-F5 gas turbine steam injection on Nox reduction applying VODOLEY system is being discussed. Results show that applying this system NO x formation reduces in the range of %30 to %43 but CO production will increase up to %60.

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