Gas premix burner

Abstract

A gas premix burner including a perforated plate, a woven wire mesh or an expanded metal sheet; and a woven, knitted or braided burner deck having metal fibers supported by the perforated plate, woven wire mesh or expanded metal sheet. The woven, knitted or braided burner deck has at least a zone with a high density of at least 1250 g/dm 3 . The zone with a high density includes at least 25% of the surface of the burner deck

1 - 13 . (canceled) 
     
     
         14 . A gas premix burner comprising:
 a perforated plate, a woven wire mesh or an expanded metal sheet; and   a woven, knitted or braided burner deck comprising metal fibers, supported by said perforated plate, woven wire mesh or expanded metal sheet;   wherein said woven, knitted or braided burner deck comprises at least a zone with a high density of at least 1250 g/dm3; wherein the zone with a high density includes at least 25% of the surface of the burner deck.   
     
     
         15 . The gas premix burner as in  claim 14 ,
 wherein said woven, knitted or braided burner deck comprises a zone or zones with a density less than the density of said zone with high density.   
     
     
         16 . The gas premix burner as in  claim 15 ,
 wherein one or more sections of the burner deck of said burner are double curved; and wherein said zone or zones of the burner deck with density less than the density of said zone with high density, comprise at least part of said one or more sections of the burner deck that are double curved.   
     
     
         17 . The gas premix burner as in  claim 15 , wherein said zone or zones of the burner deck with density less than the density of said zone with high density comprise the circumference of the burner deck. 
     
     
         18 . The gas premix burner as in  claim 14 , wherein said zone with a high density does not cover points of the burner deck that have a smallest radius of curvature less than 5 mm. 
     
     
         19 . The gas premix burner as in  claim 14 , wherein said burner deck comprises a zone or zones with a density lower than 900 g/dm3;
 and wherein said burner comprises an ionization electrode, and wherein a zone with a density lower than 900 g/dm3 is provided at the location of said ionization electrode.   
     
     
         20 . The gas premix burner as in  claim 14 , wherein said burner deck comprises a zone or zones with a density lower than 900 g/dm3;
 and wherein said burner comprises an ignition electrode, and wherein a zone with a density lower than 900 g/dm3 is provided at the location of said ignition electrode.   
     
     
         21 . The gas premix burner as in  claim 14 , wherein said burner deck has over its full surface a constant density. 
     
     
         22 . The gas premix burner as in  claim 14 , wherein said burner deck has over its full surface a constant mass per unit of area. 
     
     
         23 . The gas premix burner as in  claim 14 , wherein said burner deck is not over its full surface bonded to said perforated plate, woven wire mesh or expanded metal sheet. 
     
     
         24 . The gas premix burner as in  claim 14 , wherein said burner deck is bonded locally to said perforated plate, woven wire mesh or expanded metal sheet. 
     
     
         25 . The gas premix burner as in  claim 14 , wherein said burner deck is bonded to said perforated plate, woven wire mesh or expanded metal sheet at edge zones of said burner deck. 
     
     
         26 . The gas premix burner as in  claim 14 , wherein said burner deck is soft welded over at least part of its surface to said perforated plate, woven wire mesh or expanded metal sheet. 
     
     
         27 . A boiler or water heater comprising a gas premix burner as in  claim 14 .