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GAS TURBINE A natural gas GAS TURBINE B natural gas LPC air HPC exhaust gases CC OTB HPT 10 LPT TUR LPC air HPC CC exhaust gases HPT LPT PT Energy Systems Design Accounting for Dynamic Performance PT GENA2 7 water Figure 5.1: Simplified layout of the power generation system on the Draugen off-shore oil and gas platform. The organic Rankine cycle module is added to recover part of the thermal power released with the exhausts of turbine A. turbines are kept in operation at all times, each covering 50% of the load, while the third is kept on stand-by, allowing for maintenance work. Despite the low energy conversion efficiency, this strategy ensures the necessary reserve power for peak loads, and the safe operation of the engines. The design point specifications for the Siemens SGT-500 gas turbine are listed in Table 5.1 as provided by the manufacturer. The twin-spool engine employs two coaxial shafts coupling the low pressure compressor (LPC) with the low pressure turbine (LPT) and the high pressure compressor (HPC) with the high pressure turbine (HPT). The power turbine (PT) transfers mechanical power through a dedicated shaft to the electric generator (GEN). Table 5.1: Design point specifications for the Siemens SGT-500 industrial twin spool gas turbine installed on the Draugen off-shore oil and gas platform. 11 GENA1 GENB GENC 36 recuperator pump GAS TURBINE C LPC HPC air natural gas 21 8 CC exhaust gases HPT LPT PT condenser Turbine inlet temperature [o C] Exhaust gas temperature [o C] Exhaust gas mass flow [kg s−1 ] Electric power output [MWE ] Thermal efficiency [%] Fuel 850 379.2 91.5 16.5 31.3 Natural gas The performance of the power generation system may be enhanced by harvesting part of the ex- haust thermal power from one or more engines, by means of an ORC unit [10]. Figure 5.1 shows the layout of the power generation system considered in this chapter. Preliminary calculations suggest that incrementing the installed power by adding two or three ORC units (one for each gas turbine) is not economically feasible. In fact, the utilization factor of the whole plant decreases in this case, 125PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
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