Recovery boiler startup burner assembly

Abstract

A startup burner assembly for a recovery boiler, the startup burner assembly includes a housing having a burner end and a second end distal to the burner end; a main fuel conduit disposed within the housing; and high-pressure air conduits disposed within the burner end of the housing. The high-pressure air conduits include angled air injection nozzles configured to direct high-pressure air exiting the burner end of the startup burner assembly in a rotational direction.

What is claimed is: 
     
         1 . A startup burner assembly for a recovery boiler, the startup burner assembly comprising:
 a housing having a burner end and a second end distal to the burner end;   a main fuel conduit disposed within the housing; and   high-pressure air conduits disposed within the burner end of the housing, the high-pressure air conduits comprising angled air injection nozzles, wherein the angled air injection nozzles are configured to direct high-pressure air exiting the burner end of the startup burner assembly in a rotational direction.   
     
     
         2 . The startup burner assembly of  claim 1 , further comprising a dropletizer including a plurality of holes, the dropletizer configured to increase a surface area of fuel flowing from the main fuel conduit by dispersing the fuel into droplets as the fuel flows through the plurality of holes. 
     
     
         3 . The startup burner assembly of  claim 1 , wherein the angled air injection nozzles are configured to cause swirled high-pressure air to mix with fuel droplets to generate cyclone-shaped flames when the fuel droplets are ignited. 
     
     
         4 . The startup burner assembly of  claim 1 , wherein the angled air injection nozzles of the high-pressure air conduits are angled relative to bodies of the high-pressure air conduits. 
     
     
         5 . The startup burner assembly of  claim 1 , further comprising:
 a high-pressure air duct configured to conduct high-pressure air from a high-pressure air source; and   a manifold in fluid communication with the high-pressure air duct, the manifold being configured to distribute the high-pressure air to the high-pressure air conduits.   
     
     
         6 . The startup burner assembly of  claim 5 , wherein the manifold comprises an opening in fluid communication with the main fuel conduit. 
     
     
         7 . The startup burner assembly of  claim 1 , wherein the housing forms at least a portion of the main fuel conduit. 
     
     
         8 . A furnace for a recovery boiler, the furnace comprising:
 a windbox configured for providing air to the furnace;   a water wall configured for controlling a temperature of the furnace; and   a startup burner assembly configured to generate heat for the furnace, the startup burner assembly comprising:
 a housing having a burner end and a second end distal to the burner end; 
 a main fuel conduit disposed within the housing; and 
 high-pressure air conduits disposed within the burner end of the housing, the high-pressure air conduits comprising angled air injection nozzles, wherein the angled air injection nozzles are configured to direct high-pressure air exiting the burner end of the startup burner assembly in a rotational direction, 
 wherein the startup burner assembly is configured to extend into the furnace through openings in the windbox and the water wall. 
   
     
     
         9 . The furnace of  claim 8 , wherein the startup burner assembly further comprises:
 a dropletizer including a plurality of holes, the dropletizer configured to increase a surface area of fuel flowing from the main fuel conduit by dispersing the fuel into droplets as the fuel flows through the plurality of holes.   
     
     
         10 . The furnace of  claim 8 , wherein the angled air injection nozzles are configured to cause swirled high-pressure air to mix with fuel droplets to generate cyclone-shaped flames when the fuel droplets are ignited. 
     
     
         11 . The furnace of  claim 8 , wherein the angled air injection nozzles of the high-pressure air conduits are angled relative to bodies of the high-pressure air conduits. 
     
     
         12 . The furnace of  claim 8 , wherein the startup burner assembly further comprises:
 a high-pressure air duct configured to conduct high-pressure air from a high-pressure air source; and   a manifold in fluid communication with the high-pressure air duct, the manifold being configured to distribute the high-pressure air to the high-pressure air conduits.   
     
     
         13 . The furnace of  claim 12 , wherein the manifold comprises an opening in fluid communication with the main fuel conduit. 
     
     
         14 . The furnace of  claim 8 , further comprising a guide sleeve, wherein the housing is disposed within the guide sleeve. 
     
     
         15 . A recovery boiler, comprising:
 a furnace; and   a startup burner assembly configured to generate heat for the furnace, the startup burner assembly comprising:
 a housing having a burner end and a second end distal to the burner end; 
 a main fuel conduit disposed within the housing; and 
 high-pressure air conduits disposed within the burner end of the housing, the high-pressure air conduits comprising angled air injection nozzles, wherein the angled air injection nozzles are configured to direct high-pressure air exiting the burner end of the startup burner assembly in a rotational direction. 
   
     
     
         16 . The recovery boiler of  claim 15 , wherein the startup burner assembly further comprises:
 a dropletizer including a plurality of holes, the dropletizer configured to increase a surface area of fuel flowing from the main fuel conduit by dispersing the fuel into droplets as the fuel flows through the plurality of holes.   
     
     
         17 . The recovery boiler of  claim 15 , wherein the angled air injection nozzles are configured to cause swirled high-pressure air to mix with fuel droplets to generate cyclone-shaped flames when the fuel droplets are ignited. 
     
     
         18 . The recovery boiler of  claim 15 , wherein the angled air injection nozzles of the high-pressure air conduits are angled relative to bodies of the high-pressure air conduits. 
     
     
         19 . The recovery boiler of  claim 15 , wherein the startup burner assembly further comprises:
 a high-pressure air duct configured to conduct high-pressure air from a high-pressure air source; and   a manifold in fluid communication with the high-pressure air duct, the manifold being configured to distribute the high-pressure air to the high-pressure air conduits.   
     
     
         20 . The recovery boiler of  claim 19 , wherein the manifold comprises an opening in fluid communication with the main fuel conduit.