System and Method for the Conditioning of Recirculated Exhaust Gas

Abstract

A system, including: a recirculated exhaust gas conditioning loop that routes exhaust gas from a heat recovery steam generator to a turbine compressor inlet, wherein the recirculated exhaust gas conditioning loop includes an exhaust gas conditioning device that cools the exhaust gas and removes particulate matter from the exhaust gas, and a dehumidifier that dehumidifies the exhaust gas.

1 . A system, comprising:
 a recirculated exhaust gas conditioning loop that routes exhaust gas from a heat recovery steam generator to a turbine compressor inlet,   wherein the recirculated exhaust gas conditioning loop includes   an exhaust gas conditioning device that cools the exhaust gas and removes particulate matter from the exhaust gas, and   a dehumidifier that dehumidifies the exhaust gas.   
     
     
         2 . The system of  claim 1 , further comprising:
 a disengagement section, between the exhaust gas condition device and the dehumidifier, that removes liquid from the exhaust gas, said liquid having been introduced by the exhaust gas conditioning device.   
     
     
         3 . The system of  claim 1 , wherein the exhaust gas conditioning device includes a vertical direct contact condenser with a spray column that generates a concurrent flow of the exhaust gas and a heat transfer liquid in a same downward direction. 
     
     
         4 . The system of  claim 1 , further comprising:
 the heat recovery steam generator, wherein an input to the recirculated gas conditioning loop is in fluid communication with a top back section of the heat recovery steam generator   
     
     
         5 . The system of  claim 1 , further comprising, prior to the exhaust gas conditioning device:
 a bypass stack that provides atmospheric venting of the exhaust gas; and   a damper assembly that routes the exhaust gas to the bypass stack or the exhaust gas conditioning device.   
     
     
         6 . The system of  claim 1 , wherein the dehumidifier includes a flue gas condenser, wherein the flue gas condenser cools and dehumidifies the exhaust gas. 
     
     
         7 . The system of  claim 1 , further comprising:
 a protection stack that provides atmospheric venting of the exhaust gas downstream from the dehumidifier and prior to the turbine compressor inlet; and   a damper assembly that routes the exhaust gas to the protection stack or the turbine compressor inlet, and downstream from the flue gas condenser.   
     
     
         8 . A method, comprising:
 recirculating exhaust gas through a conditioning loop that routes exhaust gas from a heat recovery steam generator to a turbine compressor inlet, wherein the recirculating includes:
 cooling, with an exhaust gas conditioning device, the exhaust gas, 
 removing, with the exhaust gas condition device, particulate matter from the exhaust gas, and 
 dehumidifying, with a dehumidifier, the exhaust gas. 
   
     
     
         9 . The method of  claim 8 , further comprising:
 removing, with a disengagement section between the exhaust gas conditioning device and the dehumidifier, liquid from the exhaust gas, said liquid having been introduced by the exhaust gas conditioning device.   
     
     
         10 . The method of  claim 8 , wherein the exhaust gas conditioning device includes a vertical direct contact condenser with a spray column, and the method comprises generating a concurrent flow of the exhaust gas and a heat transfer liquid emitted from the spray column in a same downward direction. 
     
     
         11 . The method of  claim 8 , further comprising:
 controlling, with a computer, a damper assembly to route the exhaust gas to a bypass stack or to the exhaust gas conditioning device, wherein the bypass stack provides atmospheric venting of the exhaust gas prior to the exhaust gas reaching the exhaust gas conditioning device.   
     
     
         12 . The method of  claim 8 , wherein the dehumidifying includes using a flue gas condenser. 
     
     
         13 . The method of  claim 13 , further comprising:
 controlling, with a computer, a damper assembly to route the exhaust gas to a protection stack or the turbine compressor inlet, wherein the protection stack provides atmospheric venting of the exhaust gas downstream from the dehumidifier and prior to the turbine compressor inlet and downstream from the flue gas condenser.