Gas burner for premixed combustion

Abstract

A gas burner for premixed combustion is positioned in a combustion chamber and comprises two components, a first defined by a distributor for a gas and air mixture and the second defining the burner shell. The components being close together but spaced apart. The distributor has a perforated distribution surface through which the gas-air mixture passes directed towards the burner shell, which also has a perforated burning surface on which the flame caused by the combustion of said mixture is generated, to create a thermal load within the combustion chamber. The thermal load in this latter is disuniformly distributed.

1 . A gas burner for premixed combustion positioned in a combustion chamber and comprising two components, a first component defined by a distributor for a gas and air mixture and a second component defining the burner shell,
 said components being close together but spaced apart,   the distributor having a perforated distribution surface through which the gas-air mixture passes directed towards the burner shell, which also has a perforated burning surface on which the flame caused by the combustion of said mixture is generated, to create a thermal load within the combustion chamber,   wherein the thermal load in this combustion chamber is disuniformly distributed.   
     
     
         2 . A burner as claimed in  claim 1 , by comprising dishomogeneous distribution of the air-gas mixture towards the burner shell, said dishomogeneous mixture distribution generating a disuniform distribution of the thermal load within the combustion chamber. 
     
     
         3 . A burner as claimed in  claim 2 , wherein the distributor has its distribution surface at least partially perforated, mixture distribution being rendered non-homogeneous over said surface by through holes present therein at non-uniform pitch and/or by differentiation of the diameter of the holes. 
     
     
         4 . A burner as claimed in  claim 3 , wherein the distributor has its distribution surface partially perforated and presenting at least one zone provided with through holes and at least one non-perforated zone, said conformation enabling dishomogeneous distribution of the gas-air mixture. 
     
     
         5 . A burner as claimed in  claim 1 , wherein the burning surface presents at least one flame generation zone provided with through holes and/or slits and by which the flame is generated, and at least one zone not provided with holes and without flame generation. 
     
     
         6 . A burner as claimed in  claim 3 , wherein the perforated zone of the distributor only partially corresponds to the flame generation zone of the burner shell. 
     
     
         7 . A burner as claimed in  claim 1 , wherein at least part of the holes of the distributor and/or at least part of the holes and/or slits of the burner shell present mutually different sections. 
     
     
         8 . A burner as claimed in  claim 1 , wherein at least part of the holes of the distributor and/or at least part of the holes and/or slits of the burner shell are at distances apart which are different from the distances between other holes of said distributor and burner shell. 
     
     
         9 . A burner as claimed in  claim 1 , wherein those zones of the distributor provided with the holes are spaced from or not present in the opposing free edges which bound the perforated burning surface of the burner shell. 
     
     
         10 . A burner as claimed in  claim 1 , comprising at least one of the following characteristics:
 the distributor and the burner shell are of tubular cylindrical shape and are mutually coaxial, an interspace being present between said components,   the burner is located in a position eccentric to a longitudinal central axis within the combustion chamber,   the dishomogeneous distribution of the thermal load is a function of the dimension and/or form of the combustion chamber.   
     
     
         11 . A burner as claimed in  claim 4 , wherein the perforated zone of the distributor only partially corresponds to the flame generation zone of the burner shell. 
     
     
         12 . A burner as claimed in  claim 5 , wherein the perforated zone of the distributor only partially corresponds to the flame generation zone of the burner shell. 
     
     
         13 . A burner as claimed in  claim 1 , wherein those zones of the distributor provided with the holes are not present in the opposing free edges which bound the perforated burning surface of the burner shell.