F - Mech Eng,Light,Heat,Weapons – 02 – C
Patent
F - Mech Eng,Light,Heat,Weapons
02
C
F02C 6/18 (2006.01) F02C 1/10 (2006.01) F02C 3/32 (2006.01) F02C 7/143 (2006.01)
Patent
CA 2267818
An open/closed gas-turbine simple Brayton cycle or Brayton-Rankine gas- and steam-turbine combined-cycle power-producing system is disclosed, with the gas turbine recirculating a large portion of partly expanded high-temperature gas into an inverse mixing ejector. The inverse mixing ejector uses an injected-gas velocity that is necessarily greater than the jet-gas velocity to rise the hot-gas pressure up to the compressor-discharge level. This is a necessary condition for achieving very high cycle thermal efficiency. Maximum combined-cycle thermal efficiency can be expected to reach up to about 80%, that is, up to an appropriate temperature-level Carnot-cycle efficiency. The gas turbine cycle can operate in either simple-cycle, single-intercooled-cycle or multi- intercooled-cycle mode. The inverse mixing ejector can operate in either supersonic or subsonic regions of gas velocity; however for higher efficiencies supersonic velocities of injected and jet gas are recommended. For closed versions of the cycle, coal can be used as a fuel, as well as any other solid, liquid or gaseous fuel or waste material. Also, dry air or any other suitable gas, such as helium, can be used as a working gas-turbine fluid of a closed version of the cycle. High-temperature nuclear reactor cooled with helium (or any other suitable gas or gas mixture) can be used as a heat source for closed versions of the cycle. Open simple gas-turbine versions of the cycle are very suitable to be applied as highly effective aircraft engines. There are two possible configurations: (1) "MIXEJECT" in which hot recirculated partly expanded gas-turbine gas flows directly into the inverse mixing ejector, whereas at the outlet of the ejector there is a combustor (or any closed gas heater) for heating mixed gas up to a designed gas-turbine inlet temperature; and (2) "COMEJECT" in which hot recirculated partly expanded gas-turbine gas flows into the combustor (or any closed gas heater) for heating mixed gas up to a temperature higher than the designed gas-turbine inlet temperature, which is achieved at the outlet of the ejector by mixing with a stream of colder gas, compressed by a compressor. Both closed cycle configurations can be used without compressor. Instead of compressor, steam pressurized by a water pump can be mixed with a working gas in the inverse mixing ejector and expanded in the gas turbine. Exhaust gas would then be cooled in a high-temperature regenerator (or regenerative heat exchanger), heating both gas-turbine working gas and water/steam. These two fluids would be separated in an additional condenser, while water would then be pressurized by a pump. Corresponding cycle configurations are named "MIXEJECS" ("mixing ejector to combustion chamber - steam" configuration) and "COMEJECS" ("combustion chamber to mixing ejector - steam" configuration).
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