JPH08200627A - Burner - Google Patents

Abstract

PURPOSE: To reduce in size a burning case and to effectively restrict the diffusion of a mixed gas by forming the end burner ports of both the ends of a burner port plate in the longitudinal direction between the inner surface of the cylindrical wall at both the ends of the plate in the longitudinal direction and both the edges of the plate placed at an interval from the inner surface in the longitudinal direction of the plate. CONSTITUTION: Burning cases 11 each having a burner port plate 9 formed with a plurality of burner ports 14 for discharging a mixed gas of a fuel gas and combustion air and a cylindrical wall 10 for connecting the upper end side to the periphery of the plate 9 are provided in parallel. Discharge ports 31 for discharging the air or thin mixed gas are provided between the adjacent cases 11, and a vent passage 18 for ventilating the air upward is formed at the outer periphery of both the ends of the case 11 in the longitudinal direction of the plate. In this case, the end burner ports 15 placed at both the ends of the plate in the longitudinal direction of the ports 14 are placed between the inner surfaces of the wall 10 in the longitudinal direction of the plate and both the edges of the plate 9 in the longitudinal direction of the plate 9 at an interval in the longitudinal direction of the plate with respect to the inner surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a narrow flame nozzle plate having a plurality of flame nozzles for discharging a mixture of fuel gas and combustion air, which are formed at intervals along the longitudinal direction. , A plurality of flat combustion cases each having a flat cylindrical wall whose upper end side is connected to the peripheral portion of the flame nozzle plate are arranged in parallel with each other with a space between adjacent combustion cases. A discharge port for discharging combustion air or a light air-fuel mixture upward is provided between them, and a ventilation path for ventilating air upward is arranged on the outer peripheral side of both ends in the longitudinal direction of the flame mouth plate of the combustion case. Combustion device.

[0002]

2. Description of the Related Art Such a combustion apparatus uses combustion air or a lean air-fuel mixture between adjacent combustion cases in order to reduce the combustion temperature of the entire apparatus to minimize the generation of NOx which is a nitrogen oxide. Discharge outlets are arranged.Ventilation passages are arranged on the outer peripheral sides of both ends in the longitudinal direction of the flame mouth plate of the combustion case, and the air flow discharged upward from the air passages is discharged from the flame mouth. The air-fuel mixture or the combustion gas generated by the combustion of the air-fuel mixture is restricted from diffusing to the outer peripheral side in the longitudinal direction of the flame mouth plate. However, conventionally, as shown in FIGS. 8 and 9,
Of the plurality of flame ports 02 formed in the narrow flame port plate 01, the end flame ports 03 located on both sides of the flame port plate in the longitudinal direction are the end walls of the tubular wall 04 on both sides of the flame port plate in the longitudinal direction. It is formed in a state in which an end plate 06 which is a part of the flame nozzle plate 01 is interposed between the end plate 06 and the pressure plate 05.

[0003]

According to the above-mentioned prior art, since the length of the flame mouth plate 01 is increased by the length of the end plate 06, there is a drawback that the combustion case 07 becomes large. In addition, the air-fuel mixture 08 that tries to flow into the end flame port 03 from the direction perpendicular to the end flame port 03 collides with the air-fuel mixture 09 that flows into the end flame port 03 from the back surface sides of the flame mouth plates on both sides of the end flame port 03. Therefore, the air-fuel mixture 010 discharged from the end flame port 03 contains many turbulent components, and the air flow 0 discharged from the ventilation passage 011 is 0.
There is also a drawback that it is difficult to regulate the diffusion effectively depending on only 12.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to effectively control the diffusion of an air-fuel mixture that has passed through an end flame opening while reducing the size of a combustion case. is there.

[0005]

In the combustion apparatus of the present invention, a plurality of flame openings for discharging a mixture of fuel gas and combustion air are formed at intervals along the longitudinal direction. A plurality of flat combustion cases, each of which has a flat mouth wall and a flat tubular wall whose upper end side is connected to the circumference of the flame mouth plate,
Discharge ports are provided in parallel with each other with a space therebetween, and between adjacent combustion cases, a discharge port for discharging combustion air or a lean mixture upward is provided, and both end portions in the longitudinal direction of the flame mouth plate of the combustion case. Is a combustion device in which a ventilation path for ventilating air upward is arranged on the outer peripheral side of the combustion device, and a first characteristic configuration thereof is located on both end sides in the longitudinal direction of the flame nozzle plate among the plurality of flame nozzles. End flame mouth, the inner surface of the flame wall of the tubular wall in the longitudinal direction both ends of the flame mouth plate, and the longitudinal end edges of the flame mouth plate located at intervals in the longitudinal direction of the flame mouth plate with respect to the inner surface. It is in the point formed between them.

A second characteristic configuration is that the combustion case is formed by bending a series of plate members, and both longitudinal edges of the flame port plate are formed at the peripheral edge of the plate member.

In a third characteristic structure, both longitudinal edges of the flame port plate are formed in a triangular chevron shape, and the inner surface of the tubular wall on both sides of the flame port plate in the longitudinal direction is a longitudinal edge of the flame port plate. It is formed in a triangular mountain shape along the shape of, and the end flame port is formed in a V shape in a plan view.

The fourth characteristic structure is that a shielding plate for restricting the blowing of the air passing through the ventilation passage toward the end flame port side is provided upright at the end of the combustion case in the flame port plate longitudinal direction. is there.

In a fifth characteristic configuration, the shielding plate is erected so as to surround the peripheral edge of the combustion case in the longitudinal direction of the flame mouth plate, and the combustion case has a mountain shape in which the center side in the flame mouth plate width direction is high. It is in the point of being formed.

A sixth characteristic configuration is that the shielding plate is formed by extending the upper end of the cylindrical wall in series.

[0011]

The operation of the first characteristic structure is as follows.
Since the end flame opening is formed between the inner surface of the tubular wall and the longitudinal edge of the flame opening plate, the length of the flame opening plate is shortened. Further, the air-fuel mixture rectified along the inner surfaces of the tubular wall on both sides in the longitudinal direction of the flame nozzle plate is discharged from the end flame orifices in the direction along the inner surface of the tubular wall.

The operation of the second characteristic structure is as follows. Since a series of plate materials are bent to form a combustion case, the number of parts of the combustion case can be reduced and the manufacturing thereof can be simplified, and moreover, both end edges in the longitudinal direction of the flame vent plate formed on the periphery of the plate material, Since the end flame opening is formed between the inner wall of the tubular wall formed by bending the plate material on both sides in the longitudinal direction of the flame opening plate, it is not necessary to form the through hole for the end flame opening in the plate material.

The operation of the third characteristic structure is as follows. Since the end flame port is formed in a V shape in a plan view, the inner surface of the tubular wall on both end sides in the longitudinal direction of the flame port plate is narrowed while reducing the area of the end flame port so as to obtain a predetermined air-fuel mixture flow velocity. By forming it wide, the air-fuel mixture can be efficiently rectified along the inner surface of the wide cylindrical wall.

The operation of the fourth characteristic structure is as follows. It is possible to prevent the air that has passed through the ventilation passage from being blown into the end-flame port side, thereby preventing the air-fuel mixture from being blown up and the excessive air supply to the air-fuel mixture discharged from the end-flame port.

The operation of the fifth characteristic structure is as follows. The periphery of the end of the combustion case in the longitudinal direction of the flame mouth plate is surrounded by a shield plate, which effectively regulates the blowing of the air passing through the ventilation passage into the air-fuel mixture discharged from the end flame mouth while burning the shield plate. The case is formed in a mountain shape having a high central portion in the width direction of the flame mouth plate, and the combustion position of the air-fuel mixture discharged from the end flame mouth can be made as low as possible near the discharge port provided between the adjacent combustion cases. .

The operation of the sixth characteristic structure is as follows. There is no need to separately manufacture and install a shielding plate, and the number of parts of the combustion case can be reduced to simplify its manufacture and installation, and the air-fuel mixture that passes through the end flame port can be The flow can be rectified in series along both the inner surface on both sides in the longitudinal direction of the flame nozzle plate and the inner surface of the shielding plate.

[0017]

The effects of the first characteristic structure are as follows. The length of the flame plate can be shortened to reduce the size of the combustion case. Further, since the air-fuel mixture rectified along the inner surface of the tubular wall is discharged from the end flame port in the direction along the inner surface of the tubular wall, the turbulent flow component contained in the discharged air mixture is small, It is possible to effectively control the diffusion of the air-fuel mixture that has passed through the flame mouth.

In addition to the effect of the first characteristic constitution, the effect of the second characteristic constitution can simplify the production of the combustion case and can easily form the end flame port, so that the cost can be reduced by improving the work efficiency. be able to.

The effect of the third characteristic configuration is the first or second
In addition to the effect of the characteristic configuration, the air-fuel mixture can be efficiently rectified along the inner surface of the cylindrical wall while ensuring a predetermined air-fuel mixture flow rate, so that the diffusion of the air-fuel mixture that has passed through the end flame port is more effectively regulated. it can.

The effect of the fourth characteristic configuration is, in addition to the effect of the first, second or third characteristic configuration, prevention of blowing up of the mixed airflow and excessive air supply to the mixed airflow discharged from the end flame port. Because it is possible, it is possible to generate CO in the generation of lift and combustion gas.
It is possible to prevent a large amount of unburned components such as HC and HC.

In addition to the effect of the fourth characteristic configuration, the effect of the fifth characteristic configuration effectively prevents the occurrence of lift and a large amount of unburned components in the combustion gas,
Since the combustion position of the air-fuel mixture discharged from the end flame port can be made as low as possible near the discharge port provided between the adjacent combustion cases, when the light air-fuel mixture is discharged from the discharge port and burned. It is possible to enhance the flame holding effect due to the combustion of the air-fuel mixture discharged from the end flame port against the light air-fuel mixture.

The effect of the sixth characteristic configuration is the fourth or fifth.
In addition to the effect of the characteristic structure, the number of parts of the combustion case can be reduced and the manufacturing and installation of the case can be simplified, so the work efficiency can be improved and the cost can be reduced. The air-fuel mixture can be rectified in series along both the inner surface of the cylindrical wall on both sides in the longitudinal direction of the flame mouth plate and the inner surface of the shielding plate, so the diffusion of the air-fuel mixture passing through the end flame mouth is more effective. Can be regulated.

[0023]

1 to 3 show a combustion device used in, for example, a burner unit of a hot water supply device, in which a large number of first vent holes 3 are formed inside a burner case 2 to which an igniter 1 is attached. A box-shaped frame body 7 having a ventilation wall 4 and a peripheral wall 6 having a plurality of second ventilation holes 5 formed in the lower part is attached, and inside the box-shaped frame body 7, a flat rich combustion is provided. A plurality of burner burners 8 are accommodated in a positioned state, and these rich burner burners 8 are arranged in parallel at predetermined intervals.

As shown in FIG. 5, each of the rich combustion burners 8 has a narrow flame mouth plate 9 and a flat cylindrical wall 10 whose upper end is connected to the periphery of the flame mouth plate 9. Below the flat combustion case 11 provided with a rich mixture chamber 12, and a rich inlet 13 for introducing a fuel gas for producing a rich mixture and combustion air into the rich mixture chamber 12. The fuel gas supplied to the rich mixing chamber 12 is provided with a plurality of rich flame openings 14 for discharging the rich air-fuel mixture at intervals along the longitudinal direction on the flame mouth plate 9. And the combustion air are mixed in the process of passing through the rich mixing chamber 12 and the combustion case 11 to generate a rich mixture, and the generated rich mixture is discharged from the rich flame port 14 and burned. Is configured.

As shown in FIGS. 6 and 7, the end flame ports 15 located on both sides of the flame ports 14 in the longitudinal direction of the rich flame ports 14 are the longitudinal direction of the tubular wall 10 in the flame port plate longitudinal direction. In a plan view, V is provided between the inner surface of the end wall 16 forming both end sides and the longitudinal end edges 26 of the flame nozzle plate 9 which are located at a distance from the inner surface in the flame nozzle plate longitudinal direction. A plurality of intermediate flame nozzles 17 each formed of a letter-like shape and having three slit-like mixture gas jets long in the direction orthogonal to the flame nozzle plate longitudinal direction are formed at positions between these end flame nozzles 15. It is arranged.

At the end of the combustion case 11 in the longitudinal direction of the flame mouth plate, there is provided a shield plate 19 for restricting the blowing of the air, which has passed through the ventilation passage 18 described later, toward the end flame mouth 15 side.
Of the combustion case 11, the shielding plate 19 is formed in a triangular mountain shape having a high center in the width direction of the flame nozzle plate.

Below the rich combustion burner 8, a light gas passage 22 having a jet hole 21 for jetting the air-fuel mixture for producing a light air-fuel mixture into a ventilation chamber 20 as a light-air mixing chamber described later.
And a light introduction port 23 for introducing the fuel gas and the combustion air into the light gas passage 22.
3 and the light introduction port 23 are connected to through holes formed in the peripheral wall 6 of the box-shaped frame body 7.

The rich combustion burner 8 and the light gas passage 2
2 and the light introduction port 23 are a series of bent thin metal plates 24.
Are bonded to each other by spot welding or the like, and the flame plate 9 is attached to the metal plate 24 as shown in FIG.
The cylindrical wall 10 is formed on both sides of the flame mouth plate equivalent portion 9a.
Corresponding to the side wall 25a forming the side wall 25 and the end wall corresponding part 16a forming the end wall 16 of the tubular wall 10.
And a shield plate corresponding portion 19a forming the shield plate 19 are provided, and edge corresponding portions 26a forming both longitudinal ends of the flame port plate 9 are formed in a triangular mountain V shape on the periphery of the metal plate 24. Has been formed.

Then, the flame mouth plate corresponding portion 9a and the side wall corresponding portion 2
The boundary with 5a is bent and the end wall equivalent part 16a
Bending each other along the V-shaped edge-corresponding portion 26a and adhering to each other in a Y-shape, the inner surface of the end wall 16 of the tubular wall 10 is formed into a triangular mountain shape that follows the shape of the longitudinal edge of the flame nozzle plate 9. Then, the combustion case 1 having the V-shaped end flame port 15 in plan view
1 is formed.

Therefore, the rich air-fuel mixture in the combustion case 11 is
As shown in FIG. 7, the rich air-fuel mixture a that has been rectified along the inner surface of the V-shaped end wall 16 and discharged from the end flame port 15 is discharged.
Are further rectified along the shield plate 19.

Ventilation passages 18 for ventilating air upward are arranged on the outer peripheral sides of both ends in the longitudinal direction of the flame case plate of the combustion case 11. The ventilation passages 18 are attached to the burner case 2 and the burner case 2. Box-shaped fuel gas supply chamber 27
And the box-shaped frame body 7 so as to surround the peripheral wall 6 of the box-shaped frame body 7.

The bottom wall 28 and the ventilation wall 4 of the burner case 2
An air chamber 29 is formed between the fan F and the bottom wall 28.
The air discharge port 30 is opened, the air discharged from the air discharge port 30 into the air chamber 29 flows into the inside of the box-shaped frame 7 and the ventilation passage 18, and the air flowing into the ventilation passage 18 is mainly It is used to generate a mixture with fuel gas, which will be described later, and the rest is discharged upward along the inner surface of the burner case 2.

A discharge port 31 for discharging combustion air or a light air-fuel mixture upward is formed between the adjacent rich combustion burners 8 and the rich combustion burner 8 is used as a constituent member of these burners for rich combustion. A flat space formed between the burners 8 is formed in the ventilation chamber 20 that communicates with the discharge port 31, and the lateral side portion of the combustion case 11 of the ventilation chamber 20 is discharged from the discharge port 31 for combustion. It is configured in the rectification path 32 that rectifies the air or the light air-fuel mixture.

In each of the straightening paths 32, four straightening plates 33 made of metal are arranged along the longitudinal direction of the discharge port 31, and these straightening plates 33 are located above the upper surface of the flame port plate 9. The ejection ports 31 are juxtaposed in a direction orthogonal to the longitudinal direction of the ejection port 31 at intervals.

In the fuel gas supply chamber 27, a rich gas nozzle 34 and a light gas nozzle 35 are attached so as to correspond to the rich inlet 13 and the light inlet 23, respectively. Each of the corresponding concentrated inlet 1
3 and each of the light gas nozzles 35 is inserted into the corresponding light introduction port 23.

In the fuel gas supply chamber 27, a lean fuel gas chamber 36 communicating with the lean gas nozzle 35 and a first rich fuel gas chamber 37 communicating with alternate ones of the rich gas nozzles 34. The remaining rich gas nozzle 34 is partitioned into a second rich fuel gas chamber 38 communicating with the remaining rich gas nozzle 34.
6, the first rich fuel gas chamber 37, and the second rich fuel gas chamber 38
Is connected to the fuel gas supply passage 39 via a gas amount adjusting valve V.

When the fuel gas is blown from the rich gas nozzle 34 into the rich inlet 13, the air in the ventilation passage 18 is sucked into the rich inlet 13 as combustion air at a predetermined ratio, and the light Gas nozzle 35 to light inlet 23
When the fuel gas is blown into, the air in the ventilation passage 18 is sucked into the light introduction port 23 as combustion air at a predetermined ratio.

The fuel gas and the combustion air supplied to the light introduction port 23 are mixed in a process of passing through the light gas passage 22 to generate a mixture for generating a mixture of light and the generated mixture. The air is ejected from the ejection holes 21 into the ventilation chamber 20, and the air-fuel mixture is further mixed with the combustion air introduced from the air chamber 29 through the first air holes 3 to generate a light air-fuel mixture.
The generated light air-fuel mixture is discharged from the discharge port 31.

When the combustion load is large and high, the light fuel gas chamber 36 and the first and second rich fuel gas chambers 37 and 3 are used.
Fuel gas is supplied to each of the fuel cells 8 and 8, and the discharge port 31 functions as a lean flame port for burning the lean air-fuel mixture, and the aeration chamber 20 functions as a light air mixing chamber for producing the lean air-fuel mixture. The rich air-fuel mixture discharged from the flame outlet 14 and the light air-fuel mixture discharged from the light flame outlet 31 are combusted.

When the combustion load is small and the load is low, the fuel gas is not supplied to the light fuel gas chamber 36, and the fuel is supplied to either the first rich fuel gas chamber 37 or the second rich fuel gas chamber 38. When the gas is supplied and the combustion load is medium and medium, the fuel gas for the fresh fuel gas chamber 36 is not supplied, and the fuel gas chamber 37 for the first rich fuel gas chamber 38 and the fuel gas chamber 38 for the second rich fuel gas chamber 38 are supplied. Fuel gas is supplied to both of them, and the first vent hole 3 is provided at the time of medium load and low load.
The air that has flowed into the ventilation chamber 20 via the burner 8 for rich combustion
The secondary air is discharged from the discharge port 31.

[Other Embodiments] 1. The shape of the end flame port is not particularly limited, and it can be formed into a desired shape by appropriately selecting the inner surface shape of the tubular wall on both sides in the longitudinal direction of the flame port plate and the shape of both end edges in the longitudinal direction of the flame port plate. 2. You may implement it by making both ends of the flame case plate longitudinal direction of a combustion case face the ventilation path. 3. The combustion device according to the present invention may not burn the light air-fuel mixture. 4. In the above embodiment, each of the light introduction ports 23 and each of the light gas nozzles 35 are connected to each other so that only the light fuel gas is supplied to the light gas passage 22.
The lean fuel gas ejected from the ejection holes 21 into the ventilation chamber 20 and the combustion air introduced into the ventilation chamber 20 through the first ventilation holes 3 may be mixed to generate a lean mixture. .

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 Partial cross-sectional side view

FIG. 2 is a partially cutaway perspective view.

FIG. 3 is a perspective view of a main part

FIG. 4 is a development view of the main part of the combustion case

FIG. 5 is a sectional view of a main part

FIG. 6 is a plan view of a main part

7 is a view taken along the line VII-VII in FIG.

FIG. 8 is a perspective view of a main part showing a conventional example.

FIG. 9 is a sectional view of a main part showing a conventional example.

[Explanation of symbols]

 9 Flame Mouth Plate 10 Cylindrical Wall 11 Combustion Case 14 Flame Mouth 15 End Flame Mouth 18 Ventilation Path 19 Shielding Plate 24 Plate Material 26 End Edge 31 Discharge Port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinobu Ishihara 1-152 Oka, Minami-shi, Minato-ku, Osaka City, Osaka Prefecture Harman Co., Ltd.

Claims (6)

[Claims] 1. A narrow flame port plate (9) having a plurality of flame ports (14) for discharging a mixture of fuel gas and combustion air, which are formed at intervals along the longitudinal direction. , A plurality of flat combustion cases (11) each having a flat tubular wall (10) whose upper end side is connected to the peripheral portion of the flame nozzle plate (9) are arranged in parallel with each other at intervals. Discharge ports (31) for discharging combustion air or a lean air-fuel mixture are provided between adjacent combustion cases (11), and both ends of the combustion case (11) in the longitudinal direction of the flame mouth plate. A combustion device in which a ventilation passage (18) for venting air upward is arranged on the outer peripheral side of the portion, and the combustion device is located at both end sides in the longitudinal direction of the flame nozzle plate of the plurality of flame nozzles (14). The end flame openings (15) are the inner surfaces of the tubular wall (10) at both end sides in the longitudinal direction of the flame opening plate, and the flame openings with respect to the inner surfaces. Combustion device formed between both end edges (26) in the longitudinal direction of the flame vent plate (9), which are spaced apart in the longitudinal direction of the plate. 2. The combustion case (11) is formed by bending a series of plate members (24), and both longitudinal edges (26) of the flame nozzle plate (9) are formed at the periphery of the plate member (24). The combustion device according to claim 1, wherein 3. The longitudinal edges (2) of the flame vent plate (9)
6) is formed into a triangular mountain shape, and the cylindrical wall (1
The inner surface of both sides of the flame vent plate in the longitudinal direction of 0) is the flame vent plate (9).
The combustion device according to claim 1 or 2, wherein the end flame port (15) is formed in a V shape in a plan view, the triangular flame shape being formed along the shape of the longitudinal end edge (26) of the. 4. A shield plate (1) for restricting blowing of air passing through the ventilation passage (18) to the end flame port (15) side.
The combustion device according to claim 1, 2 or 3, wherein 9) is erected at the end of the combustion case (11) in the flame plate direction. 5. The shield plate (19) is erected so as to surround the peripheral edge of the combustion case (11) in the longitudinal direction of the flame mouth plate, and the width direction of the flame mouth plate of the combustion case (11). The combustion device according to claim 4, wherein the central side is formed in a high mountain shape. 6. The shield plate (19) is provided with the cylindrical wall (1).
5. The upper end of 0) is formed by extending in series.
Or the combustion device according to 5.