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GE Gas Turbine Performance Characteristics 30 20 10 0 60 50 40 30 20 10 100% H4H10 100 100% H2 100% CH4 100% CO 105 110 75% N2 - 25% CH4 75% CO2 - 25% CH4 115 120 125 130 Output - Percent C Figure 13. Effect of fuel heating value on output GT25842 ■ Lower-Btu gases are frequently saturated with water prior to deliver y to the turbine. This increases the combustion products heat transfer coefficients and raises the metal temperatures in the turbine section which may require lower operating firing temperature to preserve parts lives ■ As the Btu value drops, more air is required to burn the fuel. Machines with high firing temperatures may not be able to burn low Btu gases ■ Most air-blown gasifiers use air supplied from the gas turbine compressor discharge ■ The ability to extract air must be evaluated and factored into the overall heat and material balances Asa result of these influences, each turbine model will have some application guidelines on flows, temperatures and shaft output to preserve its design life. In most cases of operation with lower heating value fuels, it can be assumed that output and efficiency will be equal to or higher than that obtained on natural gas. In the case of higher heating value fuels, such as refinery gases, output and efficiency may be equal to or lower than that obtained on natural gas. Fuel Heating Most of the combined cycle turbine installations are designed for maximum efficiency. These plants often utilize integrated fuel gas heaters. Heated fuel results in higher turbine efficiency due to the reduced fuel flow required to raise the total gas temperature to firing temperature. Fuel heating will result in slightly lower gas tur- bine output because of the incremental volume flow decrease. The source of heat for the fuel typically is the IP feedwater. Since use of this energy in the gas turbine fuel heating system is thermodynamically advantageous, the com- bined cycle efficiency is improved by approxi- mately 0.6%. GE Power Systems ■ GER-3567H ■ (10/00) 11 Kcal/kg (Thousands) LHV-Btu/lb (Thousands)PDF Image | GE Gas Turbine Performance Characteristics
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