Installation comprising a premixing burner

Abstract

A premixing burner intended to be mounted in a combustion chamber, the burner being configured to be supplied with oxidant and with fuel, the burner comprising a central annular shroud and a peripheral annular shroud, the central shroud being positioned inside the peripheral shroud so as to form an annular space between these central and peripheral shrouds, the burner further comprising at least one injection of fuel and at least one injection of oxidant into the annular space so as to premix the fuel and the oxidant in the annular space.

1 - 12 . (canceled) 
     
     
         13 . A premixing burner intended to be mounted in a combustion chamber, said burner being configured to be supplied with oxidant and with fuel, said burner comprising;
 a central annular shroud; and   a peripheral annular shroud, the central shroud being positioned inside the peripheral shroud so as to form an annular space between said central and peripheral shrouds, the burner comprising at least one injection of fuel and at least one injection of oxidant into the annular space so as to premix the fuel and the oxidant in said annular space,   wherein the central shroud comprises a first angled portion defining a central angle with a central longitudinal axis of said burner,   wherein the peripheral shroud comprises a second angled portion defining a peripheral angle with the central longitudinal axis of said burner, the central angle being between zero degrees and the degree of the peripheral angle, and   wherein the first angled portion and the second angled portion define a convergent zone such that the fuel and oxidant are oriented in the direction of the central longitudinal axis.   
     
     
         14 . The burner according to  claim 13 , wherein the peripheral angle and the central angle are measured counterclockwise. 
     
     
         15 . The burner according to  claim 13 , wherein the peripheral angle is between 30 degrees and 70 degrees. 
     
     
         16 . The burner according to  claim 13 , wherein the central shroud comprises a first linear portion substantially parallel to the central longitudinal axis located upstream of the first portion angled in the direction of travel of the oxidant, wherein the peripheral shroud comprises a second linear portion substantially parallel to the central longitudinal axis located upstream of the second angled portion, said second linear portion being arranged opposite the first linear portion, wherein the annular space comprises a linear premixing zone delimited transversely by the first linear portion and the second linear portion, said linear premixing zone having a linear length measured along the central longitudinal axis and a spacing measured between the first linear portion of the central shroud and the second linear portion of the peripheral shroud in a direction perpendicular to the central longitudinal axis, said spacing being constant along the linear length, said linear premixing zone being delimited longitudinally by a proximal end located on the side of the convergent zone and by a distal end opposite the proximal end along the central longitudinal axis. 
     
     
         17 . The burner according to  claim 16 , wherein the linear length is at least equal to 3 times said spacing. 
     
     
         18 . The burner according to  claim 17 , further comprising a fuel injection system arranged in the linear premixing zone at a fuel injection distance measured from the distal end, said fuel injection distance being at least equal to 0.5 times said spacing. 
     
     
         19 . The burner according to  claim 16 , wherein the linear premixing zone is fluidly connected to an oxidant supply. 
     
     
         20 . The burner according to  claim 13 , wherein the central shroud comprises a first annular end portion defining a first end diameter and arranged downstream of the first portion angled in the direction of movement of the oxidant, wherein the peripheral shroud comprises a second end portion defining a second end diameter and arranged downstream of the second portion angled in the direction of travel of the oxidant, wherein the first end portion and the second end portion are substantially parallel to the longitudinal central axis of the burner and together define an end duct capable of ejecting at least part of the fuel/oxidant mixture from the burner in a direction substantially parallel to the longitudinal central axis. 
     
     
         21 . The burner according to  claim 20 , wherein the first end portion has a first end length measured along the longitudinal axis, wherein the second end portion has a second end length measured along the central longitudinal axis, the first end length being less than or equal to the second end length. 
     
     
         22 . An installation comprising a burner according to  claim 13  and a combustion chamber delimited laterally by a wall, said wall comprising an opening through which the burner can be inserted into said combustion chamber, wherein a longitudinal end of the peripheral shroud is located in the combustion chamber and is arranged at a first insertion length measured from the opening and along the central longitudinal axis. 
     
     
         23 . The installation according to  claim 22 , wherein the burner comprises fuel injection devices arranged in the peripheral shroud, said fuel injection devices being able to inject fuel through an injection end, the longitudinal end and the injection end being separated from one another by an offset length of between zero and the first insertion length measured along the central longitudinal axis, the injection end being arranged upstream of the longitudinal end in the direction of travel of the oxidant. 
     
     
         24 . The installation according to  claim 22 , wherein two fuel injection devices arranged in opposed position by a center of the burner are separated by a distance, wherein each fuel injection device has an injection diameter, said distance being between a summed distance of the second end diameter of the second end portion of the peripheral shroud and the injection diameter and a distance from the wall corresponding to an equivalent diameter of said wall and the injection diameter.