Evaluation of Performance of Combined Gas Units Using Steam Injection Technique
AL-Rafdain Engineering Journal (AREJ),
Volume 22, Issue 5, Pages 85-96
AbstractThe present workhas been carriedout ona gas turbine unitof a power output of 123MW operates on asimple cycle mode.Thestudy involvestwo main parts. The first part has been focusedon the effect of the ambient temperature rise on the performance of simplegas turbine unit,while the second part was concentrated toevaluate the extra power output that can obtained ,”with and without steam injection technique”, was applied to the combustion chamber of the simple gas turbine unit.Regarding the simple gas turbine,results show that the compressor mass flow rate of air power output, and thermal efficiency decreases, nearly by (9.43%),(22.627%) and(5.7%) respectively, as the ambient temperature increases from 15℃ to45 ℃ .While, the specific fuel consumption increasesby nearly(8%), as the ambienttemperature rises from 15℃-45℃.However, when the combined cycle modeis applied ,results show that the generated power output for the combined unit,has been increased nearly by (59.195%)over that one generated from simple cycleunit.Results also showed that when steam injection is used, in the combined power units, the power generated was increased by (13.931%)over that one which is generated when steam injection was not used atthesame operating condition. Key words:-Gas turbine, combined power plant, steam injection technique.
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