Burner with low porosity burner deck

Abstract

A gas burner ( 10 ), preferably a premix burner, comprising a support ( 12 ) which has a central gas inlet port for supply of gas into a gas supply chamber. The gas supply chamber is enclosed by a perforated metal plate ( 22 ). The perforated metal plate is connected at the bottom to the support through a base section. The perforations in the perforated metal plate provide a burner deck ( 20 ). The burner deck has an overall porosity which is equal to or lower than 11%. The present invention also provides use of this burner, e.g. in heat exchangers.

1 - 11 . (canceled) 
     
     
         12 . A gas burner, preferably a premix burner, comprising a support having a central gas inlet port for supply of gas into a gas supply chamber, said gas supply chamber being enclosed by a perforated metal plate, said perforated metal plate connected at the bottom to said support through a base section, said perforation in said perforated metal plate providing a burner deck, characterised in that said burner deck has an overall porosity being equal to or lower than 11%. 
     
     
         13 . A gas burner, as in  claim 12 , said burner further comprising an end cap substantially opposite to said gas inlet port, said end cap being connected to said perforated metal plate. 
     
     
         14 . A gas burner as in  claim 13 , wherein said end cap is also provided with perforations, said perforations thereby enlarging said burner deck. 
     
     
         15 . A gas burner as in  claim 12 , wherein more than 50% of the burner deck has a porosity being equal to or lower than 9% and wherein up to 50% of the burner deck has a porosity being higher than 11%. 
     
     
         16 . A gas burner as in  claim 12 , wherein said burner deck has different patterns of perforations. 
     
     
         17 . A gas burner as in  claim 16 , wherein said burner deck has at least two different patterns of perforations. 
     
     
         18 . A gas burner as in  claim 16 , wherein said burner deck has a gradually changing porosity. 
     
     
         19 . A gas burner as in  claim 16 , wherein said burner deck has a substantially completely random porosity. 
     
     
         20 . Use of the gas burner as in  claim 12 , in a heat exchanger. 
     
     
         21 . Use of the gas burner as in  claim 12 , in a furnace or air heater. 
     
     
         22 . A gas burner, preferably a premix burner, comprising a support having a central gas inlet port for supply of gas into a gas supply chamber, said gas supply chamber being enclosed by a perforated metal plate thereby eliminating a gas diffuser between the gas inlet port and the perforated metal plate, said perforated metal plate connected at the bottom to said support through a base section, said perforation in said perforated metal plate providing a burner deck, characterised in that said burner deck has an overall porosity being equal to or lower than 11%.