JP2001033008A - Gun type burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gun-type burner reduced in NOx value while maintaining good combustion state in which there is neither increase of CO nor generation of soot. SOLUTION: Gaps among the tip end of a flame-shaping cylinder 11 fixed to the front surface of the stabilizer 8 of a burner inner cylinder 4 and guide pieces 13 form a first air hole line 12, and in addition, the burner inner cylinder 4 is provided with second and third air hole lines 15 and 16 in the periphery thereof at the rear surface and tip end sides of the guide pieces 13, respectively, and further with a fourth air slit-shaped hole line 17 in the tip end periphery thereof, so that it is possible to supply a large amount of secondary stratified air and weak jet to the flame-keeping zone of a flame and yet supply secondary stratified air to combustion outside the burner inner cylinder 4 and reduce combustion temperature while maintaining good combustion so as to reduce NOx value as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gun type burner which is used as a burner for a household water heater or the like.

[0002]

2. Description of the Related Art Conventionally, in this type, for example, as disclosed in Japanese Utility Model Publication No. 5-39289,
By limiting the distance of the secondary air holes of the peripheral wall of the burner inner cylinder from the stabilizer, the number of secondary air holes and the opening area of the secondary air holes, efficient secondary combustion and short flame can be achieved, and low pressure It supplied a low-noise, low-noise gun-type burner.

[0003]

In recent years, global environmental problems have been highlighted, and in the case of combustion equipment, Nox
There has been an increasing demand for minimizing the generation of NOx, and among them, particularly in the case of this type of gun type burner, the generation of NOx is extremely high at 100 ppm or more.

In order to reduce the generation amount of Nox,
It is good to increase the amount of air and lower the combustion temperature,
The conventional gun type burner in which the number of secondary air holes is always increased or the opening area is increased has the following disadvantages.

That is, in the former, the number of air jets entering into the atomized fuel from the row near the nozzle body increases, and the droplets before evaporation evaporate from the outside to the inside (the center side of the burner inner cylinder). Because the nozzle spray is narrowed, the flame spreads thin and long as a result, and the extended flame hits the water cooling wall, which is the combustion chamber in the water heater, before the combustion ends.
It had the drawback of causing an increase in CO.

In the latter case, although a region of excessive air is locally generated in the direction of air ejection from the air holes, an air shortage occurs in the region between the air holes.
Although x can be reduced to some extent, there is a drawback that soot adheres to the inner wall of the burner inner cylinder and the air holes are gradually closed, causing abnormal combustion.
Was not able to be reduced.

[0007]

In order to solve the above-mentioned drawbacks in view of this point, the present invention particularly has a structure in which a secondary air passage is formed inside a burner outer cylinder between the burner outer cylinder. A burner inner cylinder, and furthermore, a plurality of primary air holes are provided at the bottom of the burner inner cylinder, and a nozzle body for fuel injection and a stabilizer for swirling the primary air are provided inward.
Further, in a device provided with a blower for supplying combustion air at the rear of the burner outer cylinder, a flame regulating cylinder extending forward is provided at the front of the stabilizer, and the flame regulating cylinder tip is fixed to the inner wall of the burner inner cylinder at the tip. A first air hole array for supplying secondary air is formed by a gap with the guide piece, and second and third air hole arrays are provided on the back surface and the tip side of the guide piece. A fourth air hole array formed of slits is formed on the peripheral wall.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A nozzle body 6 near a stabilizer 8 is shown.
First, the first row of air holes 1
The secondary air is supplied from the second air hole row 12.
The secondary air supplied from the air hole 14 on the rear surface of the flame regulating cylinder 11 is supplied to the flame in the flame holding area immediately after the flame regulating cylinder 11 through the gap between the tip of the flame regulating cylinder 11 and the guide piece 13. Since the secondary air is supplied in a stratified form, there is no shading in the supply of the secondary air, and the secondary air is supplied in the flame holding region during the swirling mixing, so that the air mixing is performed uniformly and good combustion is obtained. Things.

Further, secondary air is also supplied from second and third rows of air holes 15 and 16 comprising a plurality of secondary air holes formed on the back wall and the peripheral wall of the burner inner cylinder 4 at the end of the guide piece 13. By supplying the secondary air whose flow velocity is suppressed by the guide piece 13, it is possible to prevent the fire foot from elongating by pushing the flame inward, thereby preventing an increase in the amount of generated CO, and to prevent the weak secondary air jet. However, by supplying a large amount, the combustion temperature can be lowered and the NOx value can be reduced. Further, a fourth air hole array 17 composed of a plurality of slits is formed at the tip of the burner inner cylinder 4, and a layered structure is formed from here Strong secondary air is supplied,
Even when combustion is performed outside the burner inner cylinder 4, lean combustion is performed with a sufficient amount of air.
The combustion of the x value is obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gun type burner according to the present invention will be described below with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a burner outer cylinder having a bottomed cylindrical shape and a tapered shape. An inflow port 3 through which combustion air from a blower 2 fixed outward is introduced is formed at the bottom.

Reference numeral 4 denotes a burner inner cylinder provided inside the burner outer cylinder 1 so as to form a tapered secondary air passage 5 between the burner outer cylinder 1 and an electromagnetic pump (inside). (Not shown) and a plurality of primary air holes 7 at the bottom for allowing a part of air supplied from the inflow port 3 to flow in as primary air. Have been.

Reference numeral 8 denotes a stabilizer provided in the burner inner cylinder 4 in front of the nozzle body 6 and has a plurality of injection holes 9 formed in a central portion thereof. Of the swirl vane 10, and the swirl vane 10
On the outer periphery, a flame regulating cylinder 11 is provided that extends slightly forward.

Reference numeral 12 denotes the flame regulating cylinder 11 and a guide piece 13 having one end fixed to the inner wall of the burner inner cylinder 4 and the other end slightly overhanging by forming a gap between the flame regulating cylinder 11 and the tip. In the formed first air hole row, the secondary air supplied from the plurality of air holes 14 formed in the burner inner cylinder 4 on the back of the flame regulating cylinder 11 is supplied as a layer from the gap to the flame holding area immediately after turning. Things.

The first air hole array 12 is provided with a burner inner cylinder 4.
30-90 ° with respect to the axis center of
If it is less than 90 °, it will supply in the opposite direction and cause abnormal combustion. If it is more than 90 °, it will flow in the axial direction without being mixed. Is best performed.

Reference numeral 15 denotes a second air hole array formed of a plurality of air holes formed on the peripheral wall of the burner inner cylinder 4 on the back surface of the guide piece 13, and a third air formed by air holes of the burner inner cylinder 4 on the tip side of the guide piece 13. Along with the row of holes 16, a large amount of the secondary air whose flow velocity is suppressed by the guide piece 13 is supplied to the flame in the flame holding region to measure the secondary combustion and the decrease in the combustion temperature.

Reference numeral 17 denotes a fourth air hole array comprising a plurality of slits formed in the peripheral wall at the tip end of the burner inner cylinder 4 slightly separated from the third air hole array 16. By supplying the secondary air in a layered manner, the combustion temperature is further reduced to suppress the generation amount of NOx.

Reference numeral 18 denotes a rectifying cylinder fixed to the back side of the stabilizer 8, and 19 denotes a fixing flange for attaching a gun type burner.

Next, the operation of one embodiment of the present invention will be described. If the blower 2 and the electromagnetic pump are driven now, primary air is supplied into the burner inner cylinder 4 through the primary air hole 7, and fuel oil is sprayed from the nozzle body 6. The swirling primary air is mixed by the stabilizer 8 and ignited by the discharge of an ignition electrode (not shown), so that the primary combustion is performed in a flame holding region in the flame regulating cylinder 11.

After the primary combustion, the layered secondary air is supplied from the first air hole array 12 to the flame in the flame holding region at a predetermined angle, so that the supply unevenness of the secondary air does not occur. Good secondary combustion is started by supplying and mixing the entire circumference uniformly.

Further, the second air hole array 15 and the third air hole array 1
Since the secondary air supplied from 6 is supplied as a weak jet with the flow velocity suppressed by the guide piece 13, there is no problem that the flame is pushed inward and the flame becomes long and the amount of generated CO increases. By supplying a large amount of secondary air, secondary combustion can be promoted and the combustion temperature can be lowered to minimize the generation of NOx.

The fourth row of air holes 1 in the peripheral wall at the end of the burner inner cylinder 4
7 is formed by a plurality of slits, so that the last secondary air for completing combustion outside the burner inner cylinder 4 is supplied in a layered manner in a larger amount than the entire circumference, thereby further increasing the combustion temperature. Is reduced, and finally, without abnormal combustion,
It is possible to obtain combustion with a low Nox value of 0 ppm.

[0022]

As described above, according to the present invention, the combustion temperature is lowered as a whole while preventing the generation of CO and soot and performing good secondary combustion, and the gun type burner having a low NOx value of 80 ppm is obtained. To provide a household burner with a low Nox value.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gun type burner to which one embodiment of the present invention is applied.

FIG. 2 is an enlarged sectional view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner outer cylinder 2 Blower 4 Burner inner cylinder 5 Secondary air passage 6 Nozzle body 7 Primary air hole 8 Stabilizer 11 Flame regulating cylinder 12 First air hole array 13 Guide piece 15 Second air hole array 16 Third air hole array 17 4th air hole row

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naotaka Aizawa 7-7 Higashi-Shinbo, Sanjo-city, Niigata Prefecture (72) Inventor Yukitaka Nakamura 7-7 Higashi-Shinbo, Sanjo-shi, Niigata Prefecture Corona, Inc. F term (reference) 3K055 AA06 BA11 BB03 BB10 BC02 BC03

Claims (1)

[Claims] 1. A burner inner cylinder is formed inside a burner outer cylinder by forming a secondary air passage between the burner outer cylinder and a plurality of primary air holes at a bottom of the burner inner cylinder. ,
A nozzle body for fuel injection and a stabilizer for swirling the primary air are provided inward, and a blower for supplying combustion air is provided on the rear side of the burner outer cylinder. A first row of air holes for supplying secondary air, which is formed by a gap with a guide piece fixed to the inner wall of the burner inner cylinder, is formed at the tip of the flame control cylinder. A gun type burner characterized in that second and third air hole arrays are provided on the back surface and the front end side, and a fourth air hole array formed of slits is formed in the peripheral wall of the burner inner cylinder end.