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256 Oil & Gas Science and Technology – Rev. IFP, Vol. 63 (2008), No. 2 t = 0.00°C t = 9.00°C t = 15.00°C t = 17.86°C t = 25.00°C t = 32.14°C t = 39.29°C t = 46.43°C t = 50.00°C tcc = 900°C patm =1.0132 bar 28 26 24 22 20 18 16 14 12 10 8 6 26 25 24 23 22 21 20 19 18 tCC = 900°C; p1/p2 = 7.3761 pAtm = 1.0132 bar 2 4 6 8 10 p2 /p1 0 10 20 30 40 50 Figure 6 Thermal efficiency vs pressure ratio at different temperatures. Figure 7 ratio. t (°C) Thermal efficiency vs ambiant temperature at fixed pressure 55000 50000 45000 40000 35000 30000 25000 20000 15000 270 280 290 300 310 320 TAmb (K) 26 25 24 23 22 21 20 19 18 270 280 290 300 310 320 TAmb (K) ηTh Simple cycle ηTh Steam injection tcc = 900°C; p1 /p1 = 7.3761 PC Steam injection PT Steam injection PUT Steam injection tcc = 900°C; p1 /p1 = 7.3761 PC Steam cycle PT Steam cycle PUT Steam cycle Figure 8 Powers without and with steam Injection. rather low pressure ratio (ε ≈ 7.3671) and then decreases as the pressure ratio increases further. This is due of the metal- lurgical consideration. Figure 7 illustrates the decrease of efficiency as function of ambient temperature for fixed value of pressure ratio. It can be seen that, with the increase of the ambient tempera- ture, the compressor work is increased and the net power out- put is decreased, which will decrease the thermal efficiency. Figure 9 Efficiency without and with steam injection. 4.2 Gas Turbine Performances Analyzes with Steam Injection Figures 8 and 9 show the comparison between simple gas turbine performance and STIG cycle performance. From Figure 8, it can be noticed that injecting steam increase the turbine power, when the ambient temperature exceeds ISO condition. Also, it should be noted that the net power output has been kept constant by injecting steam water independent with the P (kW) ηTh_g (%) ηTh (%) ηTh (%)PDF Image | Gas Turbine Improvement with Steam Injection Combustion Sahara Conditions
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