Fuel combusting method with co2 capture

Abstract

A method for capturing emissions from a fuel combustion process comprising: providing a fuel to a combustor on a gas turbine, providing an oxidant to the combustor, combusting the fuel and the oxidant in the combustor to produce an exhaust gas, passing at least a portion of the exhaust gas to one or more catalyst beds. The one or more catalyst beds promote a reaction which consumes CO and produces CO 2 and adsorb CO 2 . Pressure at the catalyst beds is reduced by outputting a blow down stream from the catalyst beds and then CO 2 is purged from the one or more catalyst beds with a regenerant stream to create a product stream.

1 . A method for capturing emissions from a fuel combustion process comprising:
 providing a fuel to a combustor on a gas turbine;   providing an oxidant to the combustor;   combusting the fuel and the oxidant in the combustor to produce an exhaust gas;   passing at least a portion of the exhaust gas to one or more catalyst beds, wherein the one or more catalyst beds:
 promote a reaction which consumes CO and produces CO 2 ; and 
 adsorb CO 2 ; 
   reducing the pressure at the catalyst beds by outputting a blow down stream from the catalyst beds; and   purging CO 2  from the one or more catalyst beds with a regenerant stream to create a recovery stream.   
     
     
         2 . The method of  claim 1 , further comprising cooling and condensing the recovery stream to recover energy and concentrated CO 2 . 
     
     
         3 . The method of  claim 1 , wherein the one or more catalyst beds comprise at least two catalyst beds. 
     
     
         4 . The method of  claim 3 , further comprising cycling the adsorption of CO 2  by the at least two catalyst beds to allow regeneration of at least one catalyst bed while at least one other bed continues to adsorb CO 2 . 
     
     
         5 . The method of  claim 1 , further comprising passing the product stream to one or more non-catalyst adsorbent beds wherein the one or more non-catalyst adsorbent beds adsorb CO 2 . 
     
     
         6 . The method of  claim 1 , further comprising passing both a second portion of the exhaust stream and the recovery stream to one or more non-catalyst adsorbent beds. 
     
     
         7 . The method of  claim 1 , wherein the regenerant stream comprises at least one of N 2 , steam, or liquid water. 
     
     
         8 . The method of  claim 1 , wherein the regenerant stream comprises liquid water. 
     
     
         9 . A system for capturing emissions from a fuel combustion process comprising:
 a combustor on a gas turbine configured to receive fuel and an oxidant;   an exhaust gas outlet to release exhaust gas from the combustor;   one or more catalyst beds positioned downstream from a portion of the exhaust gas outlet, wherein the one or more catalyst beds:
 promote a reaction which consumes CO and produces CO 2 ; 
 adsorb CO 2 ; and 
   wherein the one or more catalyst beds further comprise:
 a blow down output feed which outputs a blow down stream to reduce the pressure in the one or more catalyst beds; 
 a first purge input feed which receives regenerant stream; 
 a first purge output feed which outputs a recovery stream for purging CO 2  from the one or more catalyst beds. 
   
     
     
         10 . The system of  claim 9 , further comprising a heat exchanger and condenser downstream from the recovery stream to recover energy and concentrated CO 2 . 
     
     
         11 . The system of  claim 9 , wherein the one or more catalyst beds comprise at least two catalyst beds. 
     
     
         12 . The system of  claim 11 , wherein adsorption of CO 2  by the at least two catalyst beds is cycled to allow regeneration of at least one catalyst bed while at least one other bed continues to adsorb CO 2 . 
     
     
         13 . The system of  claim 9 , further comprising one or more non-catalyst adsorbent beds downstream from the recovery stream wherein the one or more non-catalyst adsorbent beds adsorb CO 2 . 
     
     
         14 . The system of  claim 9 , wherein the regenerant stream comprises at least one of N 2 , steam, or liquid water. 
     
     
         15 . The system of  claim 9 , wherein the regenerant stream comprises liquid water. 
     
     
         16 . A method for capturing emissions from a hydrogen generation fuel combustion process comprising:
 providing a fuel to a fuel reforming reactor;   providing an oxidant to the fuel reforming reactor;   combusting the fuel and the oxidant in the fuel reforming reactor to produce an exhaust gas;   passing at least a portion of the exhaust gas to one or more catalyst beds, wherein the one or more catalyst beds:   promote a reaction which consumes CO and produces CO 2 ; and adsorb CO 2 ;   reducing the pressure at the catalyst beds by outputting a blow down stream from the catalyst beds; and   purging CO 2  from the one or more catalyst beds with a regenerant stream to create a recovery stream;   wherein the one or more catalyst beds are configured to operate on a fast cycle on the order of seconds and are connected by rotary or non-rotary valving means.   
     
     
         17 . The method of  claim 17 , wherein the regenerant stream comprises at least one of N 2 , CO 2 , steam, or liquid water.