GB1246164A - Power generation apparatus - Google Patents

Abstract

1,246,164. Gas turbine plant. BABCOCKATLANTIQUE. Jan.17, 1969 [Jan.19, 1968], No.2918/69. Heading F1G. [Also in Division F4] The invention relates to a gas turbine power plant which comprises a working fluid circuit having a compressor, a working fluid heater and a turbine, a refrigerating circuit comprising a compressor, a cooler-condenser, a decompression device and a vaporizer, and a circuit for flow of a heat transfer fluid which comprises a tank to contain this fluid in solid-liquid phase balance, and means for causing heat interchange between the heat transfer fluid and the working fluid also between the heat transfer fluid and the refrigerant fluid. The plant shown operates with CO 2 as the working fluid. CO 2 gas enters the compressor C and is compressed therein, the CO 2 then passing through a first inter-cooler A 2 and a second inter-cooler B 2 , the fluid then passing to the HP compressor C 2 where it is further compressed. The fluid then divides, a first portion passing to a pre-heater E and then to a heater O which may be a nuclear reactor. The heated fluid then passes to the turbine T which drives the compressors C 1 , C 2 also an electric generator G. The fluid discharging from the turbine passes through preheater E where it is used to pre-heat the HP fluid. The fluid then passes to a first pre-cooler A 1 and a second pre-cooler B 1 , the cooled fluid then returning to the LP compressor C 1 . The second portion of fluid from the HP compressor C 2 passes through line L controlled by a valve K to a coolercondenser A 3 , the liquid CO 2 then passing through expansion valve D and thence to a separator S and vessel H. The liquid CO 2 then passes through a vapourizer coil V which is immersed in brine in a tank F, the gaseous fluid then returning to vessel H and then through line M controlled by valve N to an intermediate point of the LP compressor C 1 . The brine in the tank becomes cooled and partly solidifies, the liquid brine being circulated in a line controlled by valve R to the precooler B 1 and inter-cooler B 2 . The pre-cooler A 1 , the inter-cooler A 2 and the cooler-condenser As are cooled by circulation of cooling water. At low loads energy is stored in the form of ice in the brine tank, this energy being utilized at peak loads when the ice is returned to liquid form. At low loads the valves K and N are open and valve R closed so that the brine becomes colder and eventually partially freezes. At peak loads, the valves K and N are closed and valve R is opened so that the CO 2 flows wholly in the compressorturbine circuit; also, the liquid brine circulates through the pre-cooler B 1 and inter-cooler B 2 so that maximum pre-cooling and inter-cooling is obtained from the stored frozen brine, the ice gradually returning to the liquid phase.