Patent GB-1246163-A (GB)
Title: Generation of energy in a closed gas turbine cycle
IPC: F25B11/02
Filed: 1969-01-16
Abstract: 1,246,163. Gas turbine plant-closed cycle type. BABCOCK-ATLANTIQUE. Jan.16, 1969 [Jan.18, 1968, No.2684/69. Heading F1G. [Also in Division F4] The invention relates to a gas turbine plant operating on a closed cycle and comprising a compressor, a working fluid heater and a turbine; the plant also comprises a refrigerating machine which operates by mechanical compression of a refrigerant fluid, there being means for cooling the turbine working fluid by heat exchange with the refrigerant fluid, the compression of the refrigerant fluid being performed in the working fluid compressor. The gas turbine plant shown in Fig. 1 utilizes CO 2  as the working fluid, the fluid being compressed in the compressor C, the compressed fluid being divided at F, one stream passing through a pre-heater H, then through a heater O to the turbine T which drives the compressor C and an electric generator G. The working fluid discharging from the turbine passes through heat exchanger H where it is partly cooled, then through a cooler L and then through two further heat exchangers E 1  , E 2  in series flow where it is further cooled before passing back into the compressor C at inlet point 1. The second stream of compressed fluid from the point F passes through a cooler-condenser K, the liquid then passing through two throttle valves R 1 , R 2  in parallel flow, the fluid then passing to two vessels B 1 , B 2  the gaseous fluids from which pass back to the compressor C at two different points 3 and 2 respectively, the liquids from the two vessels B 1 , B 2  passing to coils T 1 , T 2  in the heat exchangers E 1 , E 2  whereby the liquids are heated (and the turbine working fluid cooled), the heated liquid or gas passing back to the vessels B 1 , B 2 . The heater O may be a nuclear reactor. In Fig. 2 (not shown) in place of the two throttling valves R 1 , R 2  of Fig. 1, the refrigerant fluid discharging from the cooler-condenser K is de-pressurized in a turbine (T f  ) which assists in driving the compressor C and the generator (G), the low pressure fluid discharging from the turbine passing to the two vessels (B 1 ), (B 2 ) as in the first embodiment. In Fig. 3 the turbine working fluid and the refrigerant fluid are different fluids being nitrogen and CO 2  respectively, the two fluids being mixed and the mixture compressed in a single compressor C 1  . The nitrogen is compressed in a high-pressure compressor C 2  and is then preheated in heat exchanger H and heated in heater O, the heated gas then passing to turbine T which drives two compressors C 1 , C 2  and electric generator G; the nitrogen gas discharging from the turbine passes through heat exchanger H where it is partly cooled, then through cooler L, through two heat exchangers E 1 , E 2  in series flow where it is further cooled before passing into the compressor C 1  at inlet point 1. CO 2  enters the compressor C 1  at points 2 and 3 and the mixture of CO 2  and nitrogen under pressure discharges from the compressor and passes to a coolercondenser K, the liquid and gas mixture then passing to a separator S from which the nitrogen in gaseous form passes to the high pressure compressor C 2  and the liquid CO 2  passes to a vessel V. The liquid CO 2  then passes to two throttling valves R 1 , R 2  in parallel flow and then to two vessels B 1 , B 2 . The liquid CO 2  then flows through coils T 1 , T 2  in the heat exchangers E 1 , E 2  whereby the CO 2  is heated and converted to gaseous phase. The gaseous CO 2  returns to vessels B 1  , B 2  and then passes back to the compressor C 1  at points 2, 3.