Burner assembly having a modified tile

Abstract

Process and apparatuses for providing a stable flame in a burner assembly are provided. In an embodiment, the apparatus includes a burner assembly comprising a burner tile having a top surface, an outside surface, a pre-mix region and defining an interior space for introduction of combustion air. A plurality of primary fuel tips are disposed in the interior space for injection of a primary fuel followed by mixing of a portion of the primary fuel and a portion of the combustion air mix in the pre-mix region to provide a primary fuel-air mixture. A plurality of secondary fuel tips are located on the top surface or mounted near the outside surface of the burner tile. A plurality of low velocity ports are located on the top surface of the burner tile for injecting the primary fuel-air mixture from the pre-mix region.

1 . A burner assembly comprising:
 (a) a burner tile having a top surface, an outside surface, a pre-mix region and defining an interior space for introduction of combustion air;   (b) a plurality of primary fuel tips disposed in the interior space for injection of a primary fuel followed by mixing of a portion of the primary fuel and a portion of the combustion air mix in the pre-mix region to provide a primary fuel-air mixture;   (c) a plurality of secondary fuel tips located on the top surface or mounted near the outside surface of the burner tile; and   (d) a plurality of low velocity ports located on the top surface of the burner tile for injecting the primary fuel-air mixture from the pre-mix region.   
     
     
         2 . The burner assembly of  claim 1 , wherein the plurality of low velocity ports are present in a flame stabilizing lip incorporated into the burner tile. 
     
     
         3 . The burner assembly of  claim 2 , wherein the flame stabilizing lip comprises a plurality of equally spaced channels to provide a restricted flow of the primary fuel-air mixture from the pre-mix region to a downstream end of the burner tile, wherein each channel has a low velocity port, from the plurality of low velocity ports, at the downstream end for injection of the primary fuel-air mixture. 
     
     
         4 . The burner assembly of  claim 1  further comprising a plenum chamber having an inlet for introduction of the combustion air into the burner assembly. 
     
     
         5 . The burner assembly of  claim 4  further comprising a combustion zone in fluid communication with the plenum chamber. 
     
     
         6 . The burner assembly of  claim 1  further comprising a primary fuel manifold to provide the primary fuel to the burner assembly, the primary fuel manifold for feeding a plurality of primary fuel pipes having a primary fuel tip at a downstream end. 
     
     
         7 . The burner assembly of  claim 1  further comprising a secondary fuel manifold for providing the secondary fuel to the burner assembly, the secondary fuel manifold feeding a plurality of second fuel pipes having a secondary fuel tip at a downstream end. 
     
     
         8 . A burner assembly comprising:
 (a) a burner tile having a top surface, an outside surface, a pre-mix region and defining an interior space for combustion air;   (b) a plurality of primary fuel tips disposed in the interior space for injecting a primary fuel, wherein the pre-mix region is configured so that a portion of the primary fuel and a portion of the combustion air can mix to provide a primary fuel-air mixture;   (c) a plurality of secondary fuel tips located on the top surface or mounted near the outside surface of the burner tile; and   (d) a plurality of low velocity ports located on the top surface of the burner tile for injecting the primary fuel-air mixture from the pre-mix region, the plurality of low velocity ports being present in a flame stabilizing lip incorporated into the burner tile, the flame stabilizing lip comprises a plurality of channels to provide the primary fuel-air mixture from the pre-mix region to a downstream end of burner tile, wherein each channel has a low velocity port, from the plurality of low velocity ports at the downstream end to inject the primary fuel-air mixture.   
     
     
         9 . The burner assembly of  claim 8  further comprising a plenum chamber having an inlet for introduction of the combustion air into the burner assembly. 
     
     
         10 . The burner assembly of  claim 9  further comprising a combustion zone in fluid communication with the plenum chamber. 
     
     
         11 . The burner assembly of  claim 8  further comprising a primary fuel manifold to provide the primary fuel to the burner assembly, the primary fuel manifold for feeding a plurality of primary fuel pipes having a primary fuel tip at a downstream end. 
     
     
         12 . The burner assembly of  claim 8  further comprising a secondary fuel manifold to provide the secondary fuel to the burner assembly, the secondary fuel manifold feeding a plurality of second fuel pipes having a secondary fuel tip at a downstream end. 
     
     
         13 . The burner assembly of  claim 8 , wherein the plurality of channels are equally spaced along a circumference of the flame stabilizing lip. 
     
     
         14 . A method for obtaining a stable burner flame in a burner assembly, where the method comprises:
 (a) providing a primary fuel through a plurality of primary fuel tips into an interior space of the burner, the interior space being defined by a tile having a top surface, an outside surface and a pre-mix region;   (b) providing combustion air into the interior space, wherein a portion of the combustion air mixes with a portion of the primary fuel in the pre-mix region to provide a primary fuel-air mixture;   (c) providing a secondary fuel through a plurality of secondary fuel tips located on the top surface or mounted near the outside surface of the burner tile; and   (d) providing a low-velocity primary fuel-air mixture from the pre-mix region through a plurality of low velocity ports located on the top surface of the burner tile for injecting the air-fuel mixture.   
     
     
         15 . The method of  claim 14 , wherein the plurality of low velocity ports are present in a flame stabilizing lip incorporated into the burner tile. 
     
     
         16 . The method of  claim 15 , wherein the flame stabilizing comprises a comprises a plurality of equally spaced channels to provide the primary fuel-air mixture from the pre-mix region to a downstream end of burner tile, wherein each channel has a low velocity port, from the plurality of low velocity ports, at the downstream end to inject the primary fuel-air mixture. 
     
     
         17 . The method of  claim 14  further comprising providing the combustion air to the burner assembly through a plenum chamber having an inlet. 
     
     
         18 . The method of  claim 17  further comprising providing the combustion air to the combustion zone from the plenum chamber. 
     
     
         19 . The method of  claim 14  further comprising providing the primary fuel to the burner assembly through a primary fuel manifold, the primary fuel manifold feeding a plurality of primary fuel pipes having a primary fuel tip at a downstream end. 
     
     
         20 . The method of  claim 14  further comprising providing the secondary fuel to the burner assembly through a secondary fuel manifold, the secondary fuel manifold feeding a plurality of second fuel pipes having a secondary fuel tip at a downstream end.