Combustion equipment and burner combustion method

Abstract

Combustion equipment of a coaxial jet combustion scheme is provided that includes: a burner plate in which fuel and air are mixed with each other while the fuel and air pass through an air hole; a burner plate extension which is a portion of the burner plate and extends toward a combustion chamber side spaced apart from the air hole; and a protrusion disposed on the combustion chamber side of the burner plate extension so as to protrude in a direction where flow of the fuel moves. In the combustion equipment, a gap between opposite portions of the protrusion is greater than a diameter of the air hole and a flame source forming area is defined between the burner plate, the burner plate extension and the protrusion. The combustion equipment of a coaxial jet combustion scheme can achieve a further reduction in NOx emissions.

1 . Combustion equipment comprising:
 a burner plate in which fuel and air are mixed with each other while the fuel and air pass through an air hole;   a burner plate extension which is a portion of the burner plate and extends toward a combustion chamber side spaced apart from the air hole; and   a protrusion disposed on the combustion chamber side of the burner plate extension so as to protrude in direction perpendicular to a direction where a flow of the fuel passes;   wherein a gap between opposite portions of the protrusion is greater than a diameter of the air hole; and   wherein a flame source forming area is defined between the burner plate, the burner plate extension and the protrusion.   
     
     
         2 . Combustion equipment comprising:
 a steplike-shaped burner plate in which fuel and air are mixed with each other while the fuel and air pass through an air hole;   a burner plate extension which is an external circumferential portion of the burner plate and extends toward a combustion chamber side spaced apart from the air hole; and   a sharply-angled protrusion disposed on the combustion chamber side of the burner plate extension so as to protrude in a direction perpendicular to a direction where a flow of the fuel passes;   wherein a gap between opposite portions of the protrusion is greater than a diameter of the air hole; and   wherein a flame source forming area is defined between the burner plate, the burner plate extension and the protrusion.   
     
     
         3 . The combustion equipment according to  claim 1 ,
 wherein the burner plate extension is formed steplike such that the burner plate is thicker in thickness on an axial center side of the burner than on an outer circumferential side thereof; and   wherein the protrusion is provided on the external circumferential side of the steplike shape.   
     
     
         4 . The combustion equipment according to  claim 1 ,
 wherein the burner plate has a uniform thickness; and   wherein the protrusion of the burner plate which disturbs the fuel flow and air flow jetted from the air hole disposed on the axial center side of the burner is located on the downstream side of a jetting-out portion of the air hole.   
     
     
         5 . The combustion equipment according to  claim 1 ,
 wherein the air hole is inclined with respect to an axial center of the burner.   
     
     
         6 . The combustion equipment according to  claim 1 ,
 wherein the protrusion is a square protrusion.   
     
     
         7 . The combustion equipment according to  claim 1 ,
 wherein the combustion equipment is provided with a plurality of the burners each provided with the burner plate.   
     
     
         8 . The combustion equipment according to  claim 6 ,
 wherein the burner having the steplike-shaped burner plate is disposed at the axial center of the combustion equipment, and a burner having the burner plate with a uniform thickness is disposed on the outer circumferential side of the combustion equipment.   
     
     
         9 . A burner combustion method comprising;
 a first step in which coaxial jet flow is formed inside an air hole provided in a burner plate, the coaxial jet flow being such that air flow is formed on the outer circumferential side of fuel flow;   a second step in which the coaxial jet flow is jetted from the air hole to a combustion chamber; and   a third step in which the coaxial jet flow collides against a protrusion of a burner plate extension which extends toward the combustion chamber side spaced apart from the air hole, thereby forming a flame source.   
     
     
         10 . The burner combustion method according to  claim 9 , wherein the fuel flow and air flow jetted from the air hole has a velocity component swirling around a central axis of the burner.