Fuel spraying method in liquid fuel combustion burner, and liquid fuel combustion burner

A liquid fuel combustion burner attached to a top end portion of a tube projected into the interior of a combustion apparatus proper, the tube having an interior, and the liquid fuel combustion burner having a structure in which a liquid fuel supplied through a fuel passage formed in the interior of the tube is sprayed into the interior of the combustion apparatus proper together with an atomization-promoting fluid supplied through an atomization-promoting fluid passage formed in the interior of the tube and mixed with the fuel, said burner comprising a burner proper having, formed therein:

• a liquid fuel supply passage, the liquid fuel supply passage having a downstream end;
• an atomization-promoting fluid supply passage, the atomization-promoting fluid supply passage having a downstream end;
• a plurality of injection holes, each of the plurality of injection holes having a central axis and side portions disposed about the central axis;
• a first connecting passage connecting the downstream end of the atomization-promoting fluid passage to the injection holes;
• a second connecting passage connecting the downstream end of the liquid fuel supply passage to the side portions of the injection holes;
• the injection holes being arranged in a state divided into a plurality of groups, each group including a plurality of the injection holes, and the respective injection holes are opened in such directions that in each group of the injection holes, the central axes of the injection holes within each group of injection holes extend to cross one another at a first predetermined angle;
• the burner proper having a rear end face, the rear end face having a central part and a peripheral part;
• and
• the atomization-promoting fluid supply passage comprises a circular recess at the central part of the rear end face of the burner proper.

A liquid fuel combustion burner attached to a top end portion of a tube projected into the interior of a combustion apparatus proper, the tube having an interior, and the liquid fuel combustion burner having a structure in which a liquid fuel supplied through a fuel passage formed in the interior of the tube is sprayed into the interior of the combustion apparatus proper together with an atomization-promoting fluid supplied through an atomization-promoting fluid passage formed in the interior of the tube and mixed with the fuel, said burner comprising a burner proper having, formed therein;

• a liquid fuel supply passage, the liquid fuel supply passage having a downstream end;
• an atomization-promoting fluid supply passage, the atomization-promoting fluid supply passage having a downstream end;
• a plurality of injection holes, each of the plurality of injection holes having a central axis and side portions disposed about the central axis;
• a first connecting passage connecting the downstream end of the atomization-promoting fluid passage to the injection holes;
• a second connecting passage connecting the downstream end of the liquid fuel supply passage to the side portions of the injection holes;
• the injection holes being arranged in a state divided into a plurality of groups, each group including a plurality of the injection holes, and the respective injection holes are opened in such directions that in each group of the injection holes, the central axes of the injection holes within each group of injection holes extend to cross one another at a first predetermined angle;
• the burner proper having a rear end face, the rear end face having a central part and a peripheral part;
• and
• the liquid fuel supply passage comprises an annular groove at the peripheral part of the rear end face of the burner proper.

A fluid fuel spray nozzle for use in a boiler, a heating furnace or the like, said fluid fuel spray nozzle comprising:

• at least one first supply passage for providing fluid fuel;
• at least one second supply passage for providing a fluid for dividing said fluid fuel into reduced size particles;
• at least one injection passage aligned with and connected to said at least one second supply passage;
• at least one connecting passage connecting said at least one injection passage to said at least one first supply passage, said at least one connecting passage being substantially tangentially connected to said at least one injection passage;
• at least one of:
• said at least one connecting passage, and
• said at least one injection passage comprising means for producing swirling of the fluid fuel upon the fluid fuel being introduced into said at least one injection passage through said at least one connecting passage from said at least one first supply passage;
• said division-promoting fluid and said swirling fluid fuel being mixed in said injection passage to form a mixed fluid;
• means for providing at least two streams of said mixed fluid, said means for providing at least two streams of said mixed fluid being configured so that one of said two streams of said mixed fluid impinges the other of said at least two streams of said mixed fluid at a first predetermined angle upon said at least two streams of said mixed fluid being sprayed out of said nozzle;
• said at least one injection passage comprising a plurality of injection passages;
• said plurality of injection passages comprising a plurality of groups of said plurality of injection passages;
• each of said plurality of groups of injection passages comprising at least two injection passages;
• and
• each of said plurality of groups of injection passages being spaced apart in a circumferential direction from another of said plurality of groups of injection passages at a second predetermined angle.