Combustor

Abstract

A combustor is proposed which is compact and eliminates generation of NOx and unburned combustible and is capable of stable combustion. A combustor is accordingly provided which comprises a combustion section 11, a fuel supply section 12 coupled to the combustion section for supplying a fuel air mixture wherein the fuel supply section comprises a mixer of venturi tube type having a fuel supply port 25 on an inner peripheral surface of a throat part, a combustion air supply port 31 connected to a base end of the mixer of venturi tube type and an igniter made capable of generating a spark at an extremity of the mixer of venturi tube type and the combustion section comprises a frame 16 coupled to the boiler main body and a ceramic combustion tube 14 supported by the frame 16 via heat insulators 15 a, 15 b and 15 c and having one end lying in communication with the extremity of the mixer of venturi tube type in the fuel supply section and the other end projecting into the boiler main body and wherein the ceramic combustion tube is made of a ceramic functioning as an oxidation catalyst.

1 . A combustor comprising a fuel air mixer of venturi tube type having an igniter and a ceramic combustion tube having an oxidation catalyzing function positioned downstream of said fuel air mixer. 
   
   
       2 . A combustor as set forth in  claim 1 , further comprising a vortex generator disposed at an extremity of said fuel air mixer of venturi tube type such that the air fuel mixture becomes a vortex in said ceramic combustion tube. 
   
   
       3 . A combustor as set forth in  claim 1 , further comprising a top closed cylindrical cover member with which a downstream extremity of said ceramic combustion tube is covered to form a combustion chamber around the extremity of said ceramic combustion tube, said cover member having a cylindrical base end portion formed with an outlet for the combustion gas. 
   
   
       4 . A combustor as set forth in  claim 3 , wherein said cover member has an outer peripheral surface having a radiation promoting paint ap-plied thereto. 
   
   
       5 . A combustor as set forth in  claim 3 , wherein an oxidation catalyst layer is interposed between said ceramic combustion tube and the base end portion of said cover member. 
   
   
       6 . A combustor as set forth in  claim 2 , further comprising a top closed cylindrical cover member with which a downstream extremity of said ceramic combustion tube is covered to form a combustion chamber around the extremity of said ceramic combustion tube, said cover member having a cylindrical base end portion formed with an outlet for the combustion gas. 
   
   
       7 . A combustor as set forth in  claim 6 , wherein said cover member has an outer peripheral surface having a radiation promoting paint ap-plied thereto. 
   
   
       8 . A combustor as set forth in  claim 7 , wherein an oxidation catalyst layer is interposed between said ceramic combustion tube and the base end portion of said cover member. 
   
   
       9 . A combustor as set forth in  claim 6 , wherein an oxidation catalyst layer is interposed between said ceramic combustion tube and the base end portion of said cover member. 
   
   
       10 . A combustor as set forth in  claim 4 , wherein an oxidation catalyst layer is interposed between said ceramic combustion tube and the base end portion of said cover member.