System and method for treating gas turbine exhaust gas

A system for treating turbine exhaust gas comprising:

• an exhaust gas discharge structure adapted and configured to receive exhaust gas from a turbine and pass the exhaust gas through the exhaust gas discharge structure;
• an exhaust gas heat recovery device positioned within the exhaust gas discharge structure, the exhaust gas heat recovery device adapted and configured to recover heat from exhaust gas passing through the exhaust gas discharge structure through heat transfer between the exhaust gas and a first working fluid cycling through the exhaust gas heat recovery device;
• a first heat exchanger positioned at least partially within the exhaust gas discharge structure and upstream of the exhaust gas heat recovery device, the first heat exchanger adapted and configured to remove heat from an exhaust gas prior to the exhaust gas passing through the exhaust gas discharge structure by transferring heat to a second working fluid passing through the first heat exchanger, the second working fluid passing through a cooling loop to continuously provide cooling to the exhaust gas and control heat of the exhaust gas during operation of the system for treating turbine exhaust gas, the first heat exchanger being a part of the cooling loop;
• a second heat exchanger positioned downstream of the first heat exchanger in the cooling loop and being in fluid communication with the first heat exchanger, the second heat exchanger being a heat exchanger of a thermal energy storage mechanism that is adapted and configured to remove heat from the second working fluid gained at the first heat exchanger and store the removed heat in a heat storage media, the second heat exchanger being a part of the cooling loop positioned outside the exhaust gas discharge structure and outside the exhaust gas passing through the exhaust gas discharge structure;
• and a pump positioned downstream of the second heat exchanger of the thermal energy storage mechanism and being in fluid communication with the second heat exchanger of the thermal energy storage mechanism, the pump adapted and configured to cycle the second working fluid through the cooling loop, the pump being a part of the cooling loop.

A system for treating turbine exhaust gas comprising:

• a heat recovery steam generator adapted and configured to receive exhaust gas from a turbine and pass the exhaust gas through the heat recovery steam generator;
• an exhaust gas heat recovery device positioned within the heat recovery steam generator, the exhaust gas heat recovery device adapted and configured to recover heat from exhaust gas passing through the heat recovery steam generator through heat transfer between the exhaust gas and a first working fluid cycling through the exhaust gas heat recovery device;
• a first heat exchanger positioned at least partially within the heat recovery steam generator and upstream of the exhaust gas heat recovery device, the first heat exchanger adapted and configured to remove heat from an exhaust gas prior to the exhaust gas passing through the heat recovery steam generator by transferring heat to a second working fluid passing through the first heat exchanger, the second working fluid passing through a cooling loop to continuously provide cooling to the exhaust gas and control heat of the exhaust gas during operation of the system for treating turbine exhaust gas, the first heat exchanger being a part of the cooling loop;
• a second heat exchanger positioned downstream of the first heat exchanger in the cooling loop and being in fluid communication with the first heat exchanger, the second heat exchanger being a heat exchanger of a thermal energy storage mechanism that is adapted and configured to remove heat from the second working fluid gained at the first heat exchanger and store the removed heat in a heat storage media, the second heat exchanger being a part of the cooling loop positioned outside the heat recovery steam generator and outside the exhaust gas passing through the heat recovery steam generator;
• and
• a pump positioned downstream of the second heat exchanger of the thermal energy storage mechanism and being in fluid communication with the second heat exchanger of the thermal energy storage mechanism, the pump adapted and configured to cycle the second working fluid through the cooling loop, the pump being a part of the cooling loop.

A method for treating gas turbine exhaust gas flowing through an exhaust gas discharge structure comprising:

• directing a flow of exhaust gas from a gas turbine through a catalytic exhaust gas treatment device located at least partially within the exhaust gas discharge structure and treating at least one component of the exhaust gas through a catalytic reaction between a catalyst contained within the catalytic exhaust gas treatment device and the at least one component of the exhaust gas;
• directing the flow of exhaust gas from the gas turbine through a first heat exchanger located at least partially within the exhaust gas discharge structure and transferring heat from the flow of exhaust gas directed through the first heat exchanger to working fluid passing through the first heat exchanger;
• directing the working fluid through a cooling loop to continuously provide cooling to the exhaust gas directed through the first heat exchanger with the first heat exchanger being a part of the cooling loop;
• directing the working fluid through the cooling loop downstream of the first heat exchanger to a second heat exchanger in the cooling loop, the second heat exchanger being a heat exchanger of a thermal energy storage system;
• and
• removing heat from the working fluid gained at the first heat exchanger and storing the heat removed in a heat storage media of the thermal energy storage system.