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260 Oil & Gas Science and Technology – Rev. IFP, Vol. 63 (2008), No. 2 26 25 24 23 22 21 20 19 18 270 280 Figure 20 Efficiencies. 45 40 35 30 25 20 15 10 5 0 with injection of steam are shown. The lines represent the prediction using our modified computer code and points pre- diction of the same conditions. It is shown that predictions with the proposed model are in very close agreement with data published in the literature. It is interesting to note that for higher steam to air ratio (s), the prediction of the present method is very close to the upper limit (of a range carried out for several gas turbines) [29]. 5.2 Effects of Steam Injection on the Efficiency The effect of steam injection on the gas turbine efficiency is shown in Figure 22. Typically, same evolutions are observed as the above figure. We note that our computation results are in good agreement with those of the literature [23-31]. CONCLUSION AND PERSPECTIVE The STIG cycle plant plays an important role to improve the gas turbines performances. For this purpose, detailed researches were made to study the improvement of real cycle gas turbine with and without steam injection. Under hard climatic conditions, the gas turbines of Algerian petroleum plant were used. The ambient temperature varies considerably during the year can often reach 50°C in summer which reducing 28% of net power output gas turbine. The objective of the present study is to improve the per- formances of gas turbine used under Sahara conditions by injecting suitable quantities of steam in the upstream of com- bustion chamber. The suggested method has been studied and compared with a simple cycle. Efficiency, however, is held constant when the ambient temperature increases from ISO conditions to 50°C. Computer program has been devel- oped for various gas turbine processes including the effect of ambient temperature. This is achieved by studying the effect of steam injection on the gas turbine performances. Data published in the literature from the performance test- ing are used to verify the validity of the proposed model. It was shown that general trends exist for the current prediction by using published data. The device installation with a feed water circuit, econo- mizer and evaporator is proposed. The exhaust is used as an energy source in a heat recovery steam generator (HRSG) 24 20 16 12 8 4 0 Figure 22 Thermal efficiency deviation. Simple cycle STIG cycle; tiso = 05°C STIG cycle; tiso = 10°C STIG cycle; tiso = 15°C STIG cycle; tiso = 20°C STIG cycle; tiso = 25°C STIG cycle; tiso = 30°C STIG cycle; tiso = 35°C STIG cycle; tiso = 40°C STIG cycle; tiso = 42.5°C tcc = 900°C p2 / p1 = 7.3761 290 300 310 320 TAmb (K) Predicting Manufacturer [23 and 29] Computer Model [29] Theoretical study [29, 30] (ΔP/P)Min [29] (ΔP/P)Max [29] Power station of Chambiere Metz [31] 0123456789 s (%) Figure 21 Net Power output deviation. Predicting Manufacturer [23 and 29] Computer Model [29] Theoretical study [29, 30] (Δη/η)Min [29] (Δη/η)Max [29] 0123456789 s (%) Δη/η (%) ΔP/P (%) ηTh (%)PDF Image | Gas Turbine Improvement with Steam Injection Combustion Sahara Conditions
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