UNDERSTANDING GAS TURBINE PERFORMANCE

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UNDERSTANDING GAS TURBINE PERFORMANCE ( understanding-gas-turbine-performance )

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The Net Power already includes a deduction of 250 kW for the Vendor's auxiliary power losses, and thus the Heat Rate can be understood to be a "Net" heat rate. Although it doesn't specifically say so, the heat rate is probably based upon the LHV of the fuel, because of the Vendor's note at the bottom of the tabulation. 3.1.2 SiteConditions If we now wish to determine what this GTG's performance will be at the following site conditions and ambient temperature: Site Elevation: Ambient Temperature: Relative Humidity Load: NOx Suppression: Inlet System: Exhaust System: 1,000 feet AMSL 35 deg F 60 % 100% (Base) Load Steam Injection to 42 ppmvd NOx Assume the vendor's standard inlet system Unfired HRSG, with an estimated exhaust loss of: 10.0 inch H2O (i.e. an excess of 5.0 inch H2O) 3.1.3 CorrectionFactorsandCalculation By reference to the attached typical correction curves, we find the following correction factors (for power and heat rate): Baseline Value Elevation P1 Ambient Temp P2 Inlet Losses P3 Exhaust Losses P4 Stm/Fuel Ratio - Stm Injection P5 Corrected Value Power 74,750 kW 0.965 1.09 1.00 0.993 1:1 1.081 Heat Rate 10,300 btu/kw.hrLHV Figure Figure 1 Figure 2 Figure 3 Figure 4 NOx Curve Figure 8 Calc'd per below Page 19 HR1 HR2 HR3 HR4 - HR5 1.00 0.985 1.00 1.0075 1:1 0.972 84,400 kW 9,935 btu/kw.hrLHV UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900

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