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7 EP 2 713 017 A2 8 [0043] While the disclosed embodiments of the subject matter described herein have been shown in the draw- ings and fully described above with particularity and detail in connection with several exemplary embodiments, it will be apparent to those of ordinary skill in the art that 5 many modifications, changes, and omissions are possi- ble without materially departing from the novel teachings, the principles and concepts set forth herein, and advan- tages of the subject matter recited in the appended claims. Hence, the proper scope of the disclosed inno- vations should be determined only by the broadest inter- pretation of the appended claims so as to encompass all such modifications, changes, and omissions. In addition, the order or sequence of any process or method steps may be varied or re-sequenced according to alternative 15 embodiments. 7. The system of claim 6, wherein a first inlet shaft of said two driving inlet shafts is connected to a first impeller of a first stage of the integrally geared multi- stage turboexpander. 8. The system of claim 6 or 7, wherein a second inlet shaft of said two driving inlet shafts is connected to a second impeller of a second stage of the integrally geared multi-stage turboexpander. 9. The system of claim 7 or 8, wherein the first stage is the high pressure stage of the integrally geared multi-stage turboexpander. 10. The system of claim 8 or 9, wherein the second stage is the low pressure stage of the integrally geared multi-stage turboexpander. 11. The system according of any one of claims 6 to 10, wherein said outlet shaft is connected to the shaft of the driven turbomachine. providing a gas turbine; producing mechanical power with said gas tur- bine and driving a turbomachinery therewith; transferring heat from exhaust combustion gas- es of said gas turbine to an organic Rankine cy- Claims 1. A combined thermodynamic system for the produc- tion of mechanical power, comprising: 10 20 a gas turbine (1); a turbomachinery (2) driven by said gas turbine; a thermodynamic organic Rankine cycle (5), comprising an integrally geared multi-stage tur- boexpander (13); a heat transfer arrangement (9a,9,11) for trans- ferring heat from exhaust combustion gases of 30 said gas turbine to said thermodynamic organic cle; 2. The system of claim 1, wherein said driven turboma- chine is a compressor, and preferably a centrifugal compressor. 3. The system of claim 1 or 2, wherein said heat transfer 40 arrangement comprises a closed heat-transfer loop, a heat transfer fluid circulating in said heat-transfer loop transferring heat from said exhaust combustion gases to said thermodynamic organic Rankine cycle. 45 50 55 13. The method of claim 12, further comprising the steps of: providing a heat transfer arrangement comprising a closed heat-transfer loop; circulating a heat trans- fer fluid circulating in said heat-transfer loop; trans- ferring heat from said exhaust combustion gases to said thermodynamic organic Rankine cycle by means of said heat transfer fluid. 4. The system of claim 1, 2 or 3, wherein said turboma- chinery driven by said gas turbine comprises a com- pressor or a compressor train. 5. The system of any one of the preceding claims, com- prising a mechanical transmission to mechanically couple the integrally geared multi-stage turboex- pander with the turbomachine driven by the turboex- pander. 6. The system of claim 5, wherein the mechanical trans- mission comprises a gearbox with two driving inlet shafts and one driven outlet shaft. 25 12. A method for producing mechanical power and driv- ing turbomachinery, comprising the steps of: Rankine cycle; a driven turbomachine, driven by said turboex- pander. grally geared multi-stage turboexpander and 5 producing mechanical power with said organic Rankine cycle by means of a multi-stage inte- 35 driving a turbomachine therewith.PDF Image | organic rankine cycle for mechanical drive applications
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