Burners having fuel plenums

Abstract

Burners having a fuel plenum in a base are disclosed. One disclosed example apparatus includes a base of a burner, the base comprising a fuel plenum and coupled to fuel nozzles, where at least one of the fuel nozzles is in fluid communication with the fuel plenum. The disclosed example apparatus also includes a burner head of the burner comprising nozzle passages in fluid communication with an airflow path, where the burner head defines a pilot combustion space that opens towards a flame tube of the burner, and is in fluid communication with the airflow path, and where each nozzle passage is to receive a fuel nozzle to provide fuel to entrain with air from the airflow path.

What is claimed is: 
     
         1 . A method for producing heated gas, comprising:
 providing a burner with a flame tube and a burner-head body, which comprises a combustion space positioned in the flame tube, and a pilot combustion space enclosed by the burner-head body and open towards the combustion space;   providing air and injecting fuel into the pilot combustion space;   igniting the fuel which provided into the pilot combustion space;   providing air and fuel into the combustion space as an air-fuel mixture; and   combusting the air-fuel mixture in the combustion space, wherein the burner-head body is cooled with the air provided into the combustion space.   
     
     
         2 . The method as claimed in  claim 1  wherein the air provided into the combustion space and the fuel provided into the combustion space is provided into the combustion space in a relatively swirl-free manner as a premixed air-fuel mixture. 
     
     
         3 . The method as defined in  claim 1 , wherein the burner-head body is cooled with air that flows via flow paths along the outer surface of the burner-head body and moves into the combustion space via nozzle passages formed in the burner-head body. 
     
     
         4 . The method as defined in  claim 1 , wherein the pilot combustion space is provided in an insert, fastened on a base, which has a wall that projects into a burner head, and is cooled with air which flows through at least one flow passage formed between the insert and the burner head.