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A Bouam et al. / Gas Turbine Performances Improvement Using Steam Injection in the Combustion Chamber 259 51000 50000 49000 48000 47000 46000 45000 44000 43000 270 280 Figure 17 Turbine power. 290 300 TAmb (K) 310 320 5 4 3 2 1 0 270 280 290 Figure 18 Steam quantity injected. 20000 15000 10000 5000 0 0.0 1.5 Figure 19 Net power output. 300 310 320 tiso = 05°C tiso = 10°C tiso = 15°C tiso = 20°C pinj = 12 bar tinj = 320°C p2 /p1 = 7.3761 tcc = 900°C tiso = 05°C tiso = 10°C tiso = 15°C tiso = 20°C tiso = 25°C tiso = 30°C tiso = 35°C tiso = 40°C tiso = 42.5°C pinj = 12 bar tinj = 320°C p2 /p1 = 7.3761 tcc = 900°C TAmb (K) The profiles of turbine power, the necessary of steam quantity injected, net power output and the total thermal effi- ciency are presented respectively in Figures 17-20. Starting the TISO temperature, power of turbine and steam injected quantity profiles changes their course evolution upwards, because the power of turbine increase when the steam injection start. We note in Figure 20 when the ambient temperature is inferior to the standard temperature (TAmb < TISO) the gas tur- bine performance decrease by increasing the ambient temper- ature this is due to the increasing of a compressor specific work. When the ambient temperature is higher than the stan- dard temperature (TAmb > TISO), the gas turbine efficiencies remains constant with the value corresponds to tISO by the suitable qantity of steam injection in the combustor. Figure 20 shows the displacement of the beginning point of an injected steam water which corresponds to TISO. 5 RESULTS VALIDATION The results obtained by the computer model have been veri- fied using data from the performance testing of an industrial gas turbine which the characteristics are known. A modifi- cation of the computer program treats steam injection effects on gas turbine performances. The previous litera- ture studies modelling the thermodynamic cycles reveal that best performance are obtained for decreasing NOx emission, and, therefore, net power output by injecting steam into combustion chamber [23-31]. The study pre- sented in this section provides that inlet conditions of com- 3.0 4.5 6.0 P2 /P1 7.5 9.0 10.5 tiso = 05°C tiso = 10°C tiso = 15°C tiso = 20°C tiso = 25°C pinj = 12 bar, pinj = 320°C tAmb = 50°C ; tcc = 900°C pressor are fixed at standard conditions. For wide range of steam injected quantities, the values obtained were com- pared with those of the literature. 5.1 Effects of Steam Injection on the Net Power Output Figure 21 shows the evolution of the net power output varia- tion as a function of steam to air ratio. Results for operation PUt (kW) ms/ma (%) PT (kW)PDF Image | Gas Turbine Improvement with Steam Injection Combustion Sahara Conditions
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