Oxy-combustion combined cycle power plants

An oxy-combustion combined cycle power plant comprising:

• a gas turbine engine including a compressor section, a combustor section, and a turbine section, the gas turbine engine configured to combust fuel and oxygen to generate power, and configured to discharge exhaust gas comprising carbon dioxide therefrom;
• and,
• a heat recovery system comprising:
• a fluid path that is a closed loop, the fluid path channeling a working fluid that is carbon dioxide therethrough;
• a first heat exchanger coupled along the fluid path;
• and
• a turbine coupled downstream from the first heat exchanger along the fluid path, wherein the first heat exchanger is configured to transfer heat from the exhaust gas to the working fluid, and wherein the turbine is configured to use the heated working fluid, received from the first heat exchanger, to generate power;
• a condenser coupled downstream from the first heat exchanger of the heat recovery system for receiving the exhaust gas, the condenser discharging carbon dioxide that is mixed with an inert gas within the gas turbine engine and forming a working fluid for the gas turbine engine;
• and
• a recycle path extending between and fluidly coupling the condenser and an inlet of the compressor section of the gas turbine engine, the recycle path configured to provide the carbon dioxide discharged by the condenser to the compressor section of the gas turbine engine.

A zero emissions oxy-combustion combined cycle power plant comprising:

• a gas turbine engine including a compressor section, a combustor section, and a turbine section, the gas turbine engine configured to combust natural gas and pure oxygen to generate power, and configured to discharge exhaust gas consisting essentially of carbon dioxide and water therefrom;
• a heat recovery system comprising:
• a fluid path that is a closed loop, the fluid path channeling a working fluid that is carbon dioxide therethrough;
• a first heat exchanger coupled along the fluid path;
• and
• a turbine coupled downstream from the first heat exchanger along the fluid path, wherein the first heat exchanger is configured to transfer heat from the exhaust gas to the working fluid, and wherein the turbine is configured to use the heated working fluid, received from the first heat exchanger, to generate power;
• a condenser coupled downstream from the first heat exchanger of the heat recovery system for receiving the exhaust gas, the condenser discharging carbon dioxide that is mixed with an inert gas within the gas turbine engine and forming a working fluid for the gas turbine engine;
• and
• a recycle path extending between and fluidly coupling the condenser and an outlet and an inlet of the compressor section of the gas turbine engine, the recycle path configured to provide the carbon dioxide discharged by the condenser to the compressor section of the gas turbine engine.