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Al-Rafidain Engineering Vol.20 No. 3 June 2012 139 Introduction The use of gas turbines for power generation has been increased recently and likely to continue to do so in the near future. This is due to low capital cost to power ratio, the high flexibility and reliability achievable with simple cycle configuration as well as the high efficiency of integrated solutions of waste heat recovery [1-6]. Thermal energy available in the exhaust of gas turbine generator is usually recovered by means of steam bottoming cycle. However, over the past ten years, the combined gas-steam cycle has become the leading technology for electricity generation, and now days are widely adopted in power plant installation[6-12]. Beijee gas turbine power plant station comprises of four gas turbine generators of 150 MW power output at ISO condition operating on simple cycle mode with compressor pressure ratio of 11 and turbine inlet temperature of 1060 oC . Thus all thermal energy available in the exhaust gases is expelled to atmosphere with out being used for further thermal process. Hence in the current study an investigation is performed to assess the benefit of having a heat recovery steam generator for producing a superheated steam, by extracting thermal energy from gas turbine exhaust, to be directed via a steam turbine for further power production. Combined Cycle Power plant A typical combined cycle power plant is shown in figure (1). The topping cycle is an open Brayton cycle consisting of a compressor, combustion chamber and a gas turbine. A generator converts output shaft power to electric power. Exhaust gases from the topping cycle provides thermal energy to superheat steam in the steam cycle –based bottoming cycle. A heat recovery steam generator (HRSG) that includes an economizer, evaporator and superheater convert compressed liquid water exiting the pump into superheated steam. Heat recovery steam generator play a very important role in combined cycle power plant [8, 10], steam is generated at appropriate temperature and pressure to be provided to steam turbine for further electric power production. Stack Combustion chamber Compressor Turbine Generator

Thermal Evaluation of Applying Combined Cycle Mode to Beijee Gas Turbine Generators