Patent GB-1263124-A (GB)
Title: Gas turbine installation using nuclear energy or fossil fuels as heat source
IPC: F02C1/02
Filed: 1969-04-24
Abstract: 1,263,124. Gas turbine plant - closed cycle type. SIEMENS A. G. April 24, 1969 [April 24, 1968], No.21111/69. Heading F1G. [Also in Division G6] The invention relates to a gas turbine plant of the closed circuit type comprising a first compressor and a second compressor, part only of the working fluid passing through the second compressor, which part is taken from the working fluid path downstream of the low-pressure side of a recuperative heat exchanger, the part being delivered after compression to re-join the remaining part of the working fluid at the high-pressure side of the heat exchanger at a point which is at a higher temperature than that at which the remaining part enters the heat exchanger. In Fig. 1 the working fluid, CO 2 , is heated in a heat exchanger 10 by heat exchange with a fluid heated in a nuclear reactor not shown, the CO 2  discharging at 300 ata and 500C. and passing through valves 30, 31 to a compressor-drive turbine 13 and a power turbine 14, the fluids discharging from the turbines at 57 ata and 320 C. being re-united and passing to the low-pressure side of a recuperative heat exchanger 19. The fluid then passes at 56 ata and 85 C. through a cooler 22 and thence through a compressor 16 driven by the turbine 14. The fluid then divides, the major portion (70%) passing through cooler 21, compressor 18 which is also driven by turbine 14, thence through the highpressure side 20 of the heat exchanger 19, the fluid finally discharging at 305 ata and 273 C. back to the working fluid heater 10. The remaining portion (30%) of the working fluid from the compressor 16 passes direct to the compressor 17 which is driven by the turbine 13, discharging therefrom at 308 ata and 190 C. and passing through non-return valve 32 to an intermediate point a of the high-pressure coil 20 of the heat exchanger 19. An auxiliary cooler 23 controlled by a valve 37 is provided; a by-pass valve 36 is also provided. In Fig. 2 the low-pressure working fluid discharging from the heat exchanger 19 is divided, part (70%) passing through cooler 21 to compressor 18 from which it passes to the high-pressure side 20 of the heat exchanger from which it discharges at 305 ata and 327 C. back to the working fluid heater 10. The remaining part (30%) of the working fluid passes through valve 35 to the compressor 17 and then passes through N R V 32 to re-unite with the 70% at intermediate point a of the high-pressure coil 20. In Fig. 3 the working fluid is heated, at relatively low-pressure directly in the nuclear reactor 11, the heated fluid passing to the lowpressure side of the heat exchanger 19 where it heats the high-pressure working fluid in coil 20, the working fluid discharging at 300 ata and 436 C. and dividing to pass to the two turbines 14 and 13, the fluid streams from the turbines re-uniting and passing at 120 ata and 334 C. to the nuclear reactor 11. The low-pressure fluid passes through the heat exchanger 19 and then divides, part (75%) passing through cooler 21 and thence at 110 ata and 40 C. to the compressor 16 from which it discharges at 305 ata and 73 C. to high-pressure coil 20 of the heat exchanger 19. The second part (25%) of the working fluid passes to the compressor 17 from which it discharges at 303 ata and 177 C. to an intermediate point a of the high-pressure coil 20, the re-united stream then passing to the turbines 13, 14. In Fig. 5 the working fluid is heated in a heat exchanger 121 by combustion gases from a furnace 12, the fluid at 300 ata and 500 C. dividing and passing to two turbines 13, 14, the exhaust streams from the turbines re-uniting at 93 ata and 364 C. and passing to the low-pressure side of the heat exchanger 19. The flow then divides, part (70%) passing through cooler 21 and thence through compressor 16 to the high-pressure coil 20 of the heat exchanger 19. The remaining part (30%) passes through the compressor 17 and discharges at 308 ata and 197 C. to re-unite with the 70% part at intermediate point a of the high-pressure coil 20. The re-united stream then passes through heater 121 and discharges therefrom at 300 ata and 500 C. to the turbines 13, 14. Part of the low-pressure fluid from the heat exchanger 19 is tapped off at point b and passed through air pre-heater 123, the working fluid being returned at point b of the cooler 21.