System and method for treating gas turbine exhaust gas

A system for treating exhaust gas of a gas turbine comprising:

• a first heat exchanger, the first heat exchanger is adapted and configured to receive a flow of exhaust gas of a gas turbine and cool the flow of exhaust gas as the flow of exhaust gas passes through the first heat exchanger;
• a catalytic converter, the catalytic converter is adapted and configured to receive the flow of exhaust gas of the gas turbine from the first heat exchanger and reduce certain gas emissions from the flow of exhaust gas as the flow of exhaust gas passes through the catalytic converter;
• a second heat exchanger, the second heat exchanger is adapted and configured to receive the flow of exhaust gas of the gas turbine from which certain emissions have been reduced from the catalytic converter and cool the flow of exhaust gas as the flow of exhaust gas passes through the second heat exchanger;
• a district heating system, the district heating system being outside of the flow of exhaust gas of the gas turbine;
• a cooling loop, the cooling loop is adapted and configured to receive a flow of working fluid from the first heat exchanger and direct the flow of working fluid from the first heat exchanger to the district heating system, and the cooling loop is adapted and configured to receive the flow of working fluid from the district heating system and direct the flow of working fluid from the district heating system to the second heat exchanger, and the cooling loop is adapted and configured to receive the flow of working fluid from the second heat exchanger and direct the flow of working fluid from the second heat exchanger to the first heat exchange;
• an exhaust discharge structure, the exhaust discharge structure is adapted and configured to receive the flow of exhaust gas of the gas turbine and to direct the flow of exhaust gas to the first heat exchanger, and then to direct the flow of exhaust gas from the first heat exchanger to the catalytic converter, and then to direct the flow of exhaust gas from the catalytic converter to the second heat exchanger;
• and
• the district heating system being outside the exhaust gas discharge structure.

A system for treating exhaust gas comprising:

• an exhaust gas discharge structure, the exhaust gas discharge structure is adapted and configured to receive a flow of exhaust gas from a gas turbine and direct the flow of exhaust gas through the exhaust gas discharge structure;
• a first heat exchanger in the exhaust gas discharge structure, the first heat exchanger is adapted and configured to receive the flow of exhaust gas directed through the exhaust gas discharge structure and cool the flow of exhaust gas as the flow of exhaust gas passes through the first heat exchanger;
• a first catalytic converter in the exhaust gas discharge structure, the first catalytic converter is adapted and configured to receive the flow of exhaust gas directed through the exhaust gas discharge structure from the first heat exchanger and reduce certain emissions from the flow of exhaust gas received from the first heat exchanger as the flow of exhaust gas passes through the first catalytic converter;
• a second heat exchanger in the exhaust gas discharge structure, the second heat exchanger is adapted and configured to receive the flow of exhaust gas directed through the exhaust gas discharge structure from the catalytic converter and cool the flow of exhaust gas as the flow of exhaust gas passes through the second heat exchanger;
• a second catalytic converter in the exhaust gas discharge structure, the second catalytic converter is adapted and configured to receive the flow of exhaust gas directed through the exhaust gas discharge structure that has been cooled by the second heat exchanger, the second catalytic converter is adapted and configured to reduce certain gas emissions from the flow of exhaust gas received from the second heat exchanger as the flow of exhaust gas passes through the second catalytic converter;
• a district heating system outside the exhaust gas discharge structure and outside the flow of exhaust gas directed through the exhaust gas discharge structure;
• and
• a cooling loop, the cooling loop is adapted and configured to receive a flow of working fluid from the first heat exchanger and direct the flow of working fluid from the first heat exchanger to the district heating system, and the cooling loop is adapted and configured to receive the flow of working fluid from the district heating system and direct the flow of working fluid from the district heating system to the second heat exchanger, and the cooling loop is adapted and configured to receive the flow of working fluid from the second heat exchanger and direct the flow of working fluid from the second heat exchanger to the first heat exchanger.

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 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 flow of exhaust gas from the first heat exchanger through a catalytic converter located within the exhaust gas discharge structure and reducing certain gas emissions from the flow of exhaust gas directed through the catalytic converter;
• directing the flow of exhaust gas with certain gas emissions reduced from the catalytic converter through a second heat exchanger located within the exhaust gas discharge structure and transferring heat from the flow of exhaust gas directed through the second heat exchanger to working fluid passing through the second heat exchanger;
• connecting the first heat exchanger and the second heat exchanger in a cooling loop with a district heating system, the district heating system being located outside of the exhaust gas discharge structure;
• and
• cycling the working fluid in the cooling loop from the first heat exchanger, through the district heating system, through the second heat exchanger and to the first heat exchanger.