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140 ® ®'\® 0:: D.. STEAM HEADER DATA Compressor Delivery Press (PSIG) Fuel Flow (MSCFH) Calculated Measured Calculated Measured Run 3 Mar. 8/89 66.4 66.3 108.1 Run 4 Mar. 8/89 69.0 68.5 1 10.3 Run 5 Mar. 8/89 65.2 65.0 DATA Steam Flow (PPH) Superheater Exit Pressure (PSIG) Water Temperature Leaving Economizer ("F) Stack Temperature ("F) CALCULATED 60,000 625 QUOTED 60,000 625 z wu 8 4 i ;:;:: ... w ::iE :: ::iE 82 20 0 � 80 180 160 c� �1,j 86 ®V"' It was concluded that the gas turbine model was valid for steam injection studies and that Unit 5 was performing close to original quotations. COMBINED CYCLE MODEL AND STEAM INJECTION POTENTIAL For the purpose of studying the effect of steam injection on combined cycle efficiency, the combined cycle was defined around an individual turbine, boiler, and steam turbine, as shown in Figure 5. � \ 1.0-10 Figure 5. Combined Cycle Schematic Representation. Boiler evaporator, superheater, and economizer surface areas given by Vogt, were combined with representative heat transfer coefficients for each surface to predict steam output. Model vs quoted boiler performance with the boiler fired is shown in Table 3. Gas turbine exhaust was from Unit 5 at site elevation and 59°F ambient temperature, and the boiler was fired to 1140°F (243°F fired temperature rise) by burning 28.9 MSCFH of fuel. It can be seen that at 60,000 pph steam flow, calculated stack temperature and water temperature leaving the economizer were similar to quoted values, while the predicted superheater exit temperature was 23°F below quoted. This 23°F difference was considered acceptable for the steam injection study. Table 3. Comparison of Calculated and Quoted Vogt Boiler Performance Data. PROCEEDINGS OF THE TWENTY-FIRST TURBOMACHINERY SYMPOSIUM -20 F'w GAS TURBIN£ FUEL BOILER FUEL FEEDWATER 1----- GAS TURBINE POWER " ::iE.. ii 1ii !:: POWER TURBINE VANE POSITION (DEG) Figure 4. Power Turbine Characteristics vs Vane Position. reasonable match of Unit 5's March test data was achieved, as shown in Table 2. The model results were then compared to the available quoted data for Unit 5. At quoted exhaust temperatures, calculated horse power was within 300 hp of quoted, similar to the match against measured data. Table 2. Unit Number 5. Comparison of Calculated and Measured Performance Data. ; ::iE 0 F' 140 - 120 -40 X 200 � 1;; z/ l; 80 ::iE1,j �(!) 100 C/) 0 +10 +20 +30 GAS TURBINE + BOILER INJEtnON STEAM 100 F' 2.0 1;; - - ... - - - - - ... - - - ... - .. .. .. - - .. - - .. .. - _, �� F' BOILER STEAM J-- ST DEAERAnON + AUX STEAM INJEtnON STEAM � 1;; STEAMTURBINE POWER (!) 150 z- I � l;lo.. Calculated Temp ("F) Measured Exhaust 106.2 109.2 885 883 875 877 97. 1 820 822 Horsepower Calculated Measured Power Turbine Vane Angle(0) Measured Calculated 7505 7764 + 1.5 +2.0 7690 7853 +2.3 +3.0 6470 6770 +3.0 +4.0 Feedwater Temperature ("F) Superheater Exit Temperature ("F) 225 727 435 413 225 750 450 409 3.0 98.7PDF Image | STEAM INJECTION SYSTEM ON AN EARLY FRAME 3 GAS TURBINE IN A COMBINED CYCLE PIPELINE COMPRESSOR STATION
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