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Oregen2010_new casing 27/05/10 10:33 Pagina 1 Power generation with zero additional emissions ORegen is a thermodynamic superheat cycle that recovers waste heat from gas turbine exhaust and converts it into electric energy. The thermodynamic cycle is based on an Organic Rankine Cycle (ORC). Heat from the turbine exhaust is transferred to a closed diathermic oil loop, which is used to heat an organic fluid loop. This lower temperature heat is then converted into useful work that can generate electricity. The ORC works with a hydrocarbon fluid in place of water. The system is similar to a conventional steam bottoming cycle except for the organic fluid that drives a turboexpander that in turn drives the generator. The diathermic oil and the organic fluid allow low temperature heat sources to be exploited efficiently to produce electricity over a wide range of power output, from a few MW up to 16 MW per unit. Closed loop system The organic working fluid is vaporized and pressurized in the evaporator by the application of heat taken from the gas turbine exhaust stream. Then, the vapor expands in the turboexpander and is condensed using air-cooled heat exchangers at ambient conditions. The condensate is pumped back to the evaporator, thus closing the thermodynamic cycle. The heating and cooling sources are not in direct contact with the working fluid, nor with the expander. For higher temperature applications, a high temperature thermal oil is used as the heat carrier and a regenerator is added to further improve the cycle performance. The selection of the working fluid is key in a Rankine Cycle. The features are: • Low freezing point and high temperature stability • High heat of vaporization and density • Low environmental impact • No additional EHS considerations • Readily available at low cost ORegen vs Steam Cycle Features ORegen Water free *** Low maintenance *** Power flexibility *** Low investment ** Plant simplicity *** Reduced footprint *** No replenishment of working fluid *** Unmanned capability *** Additional output ** Standard Steam Combined Cycle Expected ORegen Power Output for Mechanical Drive and Power Generation Gas Turbines Gas Turbine Model PGT25 (*) PGT25+ (*) PGT25+ G4 (*) MS5001 (*) MS5002C (*) MS5002D (*) MS6001B (*) LM6000 (**) Gas Turbine Exhaust Exhaust Power Flow Temp (KW) (Kg/sec) (°C) 23,261 68.9 525 31,364 84.3 500 33,973 89.0 510 26,830 125.2 483 28,340 124.3 517 32,580 141.4 509 43,530 145.0 544 43,397 125.6 454 * * * * * * * * *** Gas Turbine Efficiency (%) 37.7 41.1 41.1 28.4 28.8 29.4 33.3 41.7 ORegen Gross Output System Efficiency (MWe) (%) 6.9 48.9 7.9 51.5 8.6 51.5 11.3 40.4 12.4 41.4 13.8 41.9 15.6 45.2 9.7 51.1 Reference data @ISO Conditions, 100% GT Turbine load, one to one configuration (*) Values at gas turbine shaft (**) Values at generator terminals for LM6000PC coupled to 60 Hz generator Scope of Supply The basic scope of supply includes the following: • Organic fluid system • Diathermic oil system • Boilers and heat exchangers • Turboexpander genset • Piping and BOP components • Air or water cooler Waste Heat Recovery Unit Organic Fluid SystemPDF Image | ORegen superheat cycle waste heat from gas turbine exhaust
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