System and method for gasification

Abstract

A system includes an integrated reactor-syngas cooler that may gasify a feedstock. The integrated reactor-syngas cooler includes a reaction zone that may receive a first syngas and the feedstock, and that may gasify the feedstock to generate a second syngas. The second syngas has a composition different from the first syngas. The system also includes one or more feed injectors disposed in the integrated reactor-syngas cooler and that may supply the feedstock to the reaction zone and a cooling zone disposed downstream of the reaction zone and including one or more cooling tubes. The cooling zone may receive and cool the second syngas.

1 . A system, comprising:
 an integrated reactor-syngas cooler configured to gasify a feedstock, wherein the integrated reactor-syngas cooler comprises:   a reaction zone configured to receive a first syngas and the feedstock, and to gasify the feedstock to generate a second syngas, wherein the second syngas has a composition different from the first syngas;   one or more feed injectors disposed in the integrated reactor-syngas cooler and configured to supply the feedstock to the reaction zone; and   a cooling zone disposed downstream of the reaction zone and comprising one or more cooling tubes, wherein the cooling zone is configured to receive and cool the second syngas.   
     
     
         2 . The system of  claim 1 , comprising a gasifier fluidly coupled to the integrated reactor-syngas cooler, wherein the gasifier is configured to generate the first syngas. 
     
     
         3 . The system of  claim 1 , wherein the second syngas is at least one of quenched or partially quenched in the cooling zone by combination with a quenching or partial quenching agent, respectively, before discharge from the integrated reactor-syngas cooler. 
     
     
         4 . The system of  claim 3 , wherein the quenching or partial quenching occurs in a downstream portion of the cooling zone. 
     
     
         5 . The system of  claim 3 , wherein the quenching agent is comprised of at least one of liquid water and a solvent, and the partial quenching agent is comprised of at least one of nitrogen, recycle syngas, carbon dioxide and superheated steam. 
     
     
         6 . The system of  claim 1 , wherein the cooling tubes are aligned with an integrated reactor-syngas cooler centerline such that the cooling tubes are axially and circumferentially arranged over at least a portion of the cooling region. 
     
     
         7 . The system of  claim 1 , wherein the cooling tubes circumferentially spiral about an integrated reactor-syngas cooler centerline to form a helical configuration over at least a portion of the integrated reactor-syngas cooler. 
     
     
         8 . The system of  claim 1 , wherein at least a portion of the reaction zone of the integrated reactor-syngas cooler comprises a protective barrier. 
     
     
         9 . The system of  claim 1 , comprising a particle separation system fluidly coupled to the reaction zone, wherein the particle separation system is configured to receive the first syngas from a gasifier disposed upstream of the reaction zone to enable separation of at least one of slag or particulates from the first syngas before directing the first syngas to the reaction zone. 
     
     
         10 . The system of  claim 1 , comprising a controller configured to control an amount of at least one of the feedstock, or a moderator, or a reactive gas, or a combination thereof, supplied to the reactor to enrich the second syngas with methane or hydrogen. 
     
     
         11 . The system of  claim 1 , wherein the one or more feed injectors are circumferentially distributed in the integrated reactor-syngas cooler, and wherein the one or more feed injectors are configured to direct the feedstock axially, circumferentially or toward an integrated reactor-syngas cooler centerline axis within the integrated reactor-syngas cooler. 
     
     
         12 . A method, comprising:
 gasifying a first feedstock in a gasifier to generate a first syngas;   directing the first syngas to an integrated reactor-syngas cooler fluidly coupled to the gasifier;   supplying a second feedstock to the integrated reactor-syngas cooler, wherein the integrated reactor-syngas cooler comprises a reaction zone configured to gasify the second feedstock by reaction with the first syngas to generate a second syngas; and
 adjusting an amount of the second feedstock supplied to the reaction zone of the integrated reactor-syngas cooler to adjust a composition of the second syngas. 
   
     
     
         13 . The method of  claim 12 , comprising adjusting an amount of at least one of a moderator and a reactive gas supplied to the reaction zone to adjust the composition of the second syngas. 
     
     
         14 . The method of  claim 12 , wherein the first feedstock and the second feedstock are the same. 
     
     
         15 . The method of  claim 12 , wherein the first feedstock and the second feedstock are different. 
     
     
         16 . The method of  claim 12 , comprising separating at least one of slag and particulates from the first syngas prior to directing the first syngas into the reaction zone of the integrated reactor-syngas cooler. 
     
     
         17 . The method of  claim 12 , comprising cooling the second syngas in a cooling zone of the integrated reactor-syngas cooler. 
     
     
         18 . The method of  claim 12 , wherein the second syngas is enriched with methane or hydrogen. 
     
     
         19 . A system, comprising:
 a controller, comprising:
 one or more tangible, non-transitory, machine-readable media collectively storing one or more sets of instructions; and 
 one or more processing devices configured to execute the one or more sets of instructions to monitor or control operations of the system, wherein the one or more sets of instructions are configured to:
 supply a first feedstock to a gasifier and a second feedstock to a reaction zone of an integrated reactor-syngas cooler disposed downstream of the gasifier, wherein the gasifier is fluidly coupled to the reaction zone of the integrated reactor-syngas cooler and configured to gasify the first feedstock to generate a first syngas; 
 gasify the second feedstock in the reaction zone of the integrated reactor-syngas cooler to generate a second syngas, wherein the reaction zone of the integrated reactor-syngas cooler utilizes heat from the first syngas to gasify the second feedstock; and 
 adjust an amount of the second feedstock in the reaction zone of the integrated reactor-syngas cooler to enrich the second syngas with methane or hydrogen and adjust the temperature of the second syngas. 
 
   
     
     
         20 . The system of  claim 20 , wherein the controller adjusts an amount of moderator or reactive gas in the reaction zone of the integrated reactor-syngas cooler to modify the composition of the second syngas.