JPH1047615A - Burner device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict a generation of NOx of a burner device, wherein amounts of air supplied to first and second burners are made different from each other such that rich-fuel mixture gas is supplied to the first burners while lean-fuel mixture gas is supplied to the second burners and the flame of the second burners are held by the flame of the first burners. SOLUTION: Rich-fuel mixture gas is supplied to burner portions 1a, while lean-fuel mixture gas is supplied to burner portions 1b, and these burner portions 1a, 1b carry out their combustion independently. Provided that the theoretical air a mount λ is set to be 1, an air ratio of the mixture gas supplied to the burners 1a, 1b is set to be approximately 0.4 (λ≈0.4) at the rich-fuel mixture gas side while it is set to be approximately 1.2-1.5 (λ≈1.2-1.5) at the lean-fuel mixture gas side. Furthermore, the ratio of fuel gas amounts supplied to the burners 1a, 1b is determined such that the fuel gas amount supplied to the burners 1a relative to the fuel gas amount supplied to the burners 1b is approximately set to 3 to 7. In this manner, since the combustion gas amount of the lean-fuel mixture gas is greater than that of the rich-fuel mixture gas, the amount of NOx generated by the burner device can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner device in a combustion device for home use or small business use.

[0002]

2. Description of the Related Art Nitrogen oxides (NO _x ) contained in the combustion gas of burners in various combustion devices are toxic to the human body and, when released into the atmosphere, cause acid rain and photochemical smog. Have been done. Therefore, the burner used in a combustion apparatus, various countermeasures to reduce the generation amount of the NO _X have been taken.

[0003]

Problems to be solved by the present invention
For large-scale combustion equipment for industrial use, etc.
Household and small commercial combustion equipment
Although there are problems with sound, etc., although sufficient measures have been taken
Absent. Large combustion equipment increases the static pressure of the combustion fan
Control of the flow of combustion gases and air
Flexibility in burner layout and noise reduction
Is easy, and the conditions for countermeasures against noise are strict.
So-called slow combustion because the combustion chamber is large
NO by _XComplete combustion is easy even if reduction measures are taken. This
On the other hand, a small combustion device increases the static pressure of the combustion fan.
It is difficult to control the flow of combustion gases and air
Low degree of freedom in burner layout, noise suppression
Strict measures against noise and the combustion chamber
NO compared to large combustion equipment because it cannot be large _X
Difficult to reduce.

[0004] Therefore, an object of the present invention is to provide a burner device in which the generation of nitrogen oxides is suppressed.

[0005]

The burner device of the present invention comprises:
The ratio of air and fuel gas of the mixed gas to be burned in the first and second burners (first burner portions 1a and 4a, second burner portions 1b and 4b) is made different, so that the fuel-rich mixed gas is burned. By coexisting combustion with a lean gas mixture, the generation of nitrogen oxides is suppressed while maintaining stable combustion.

As shown in FIGS. 1 to 6, the burner apparatus according to the present invention comprises a first burner (1) having independent flame holes.
a, 4a) and a second burner (1b, 4b), wherein the first and second burners are alternately arranged adjacent to each other, and the fuel gas supplied to the first and second burners is provided. , The amount of air between the first burner and the second burner is changed, a fuel-rich mixed gas is supplied to the first burner, and a fuel-lean mixed gas is supplied to the second burner. Is supplied and burned, and the flame on the second burner side is maintained by the flame on the first burner side.

[0007] With this configuration, the combustion of excess air by the fuel-lean mixture gas alone has poor flame stability. However, the stable flame of the fuel-rich mixture gas described above is adjacent to this flame. As a result, the flame stabilizes the excess air flame as a pilot flame. As a result, the occurrence of noise is suppressed without causing the lift of the flame or the oscillating combustion.

Further, since the combustion of the fuel-lean mixed gas stabilized by the flame of the fuel-rich mixed gas is the combustion of excess air, the temperature of the flame is kept low by the cooling action of the excess air. generation of the NO _X is reduced. The amount of fuel gas provided for combustion as such a fuel-lean mixture is larger than the amount of fuel gas provided for fuel-rich mixture, and as a result, the generation of NO _X in the combustion amount of the entire burner The amount can be reduced.

The burner device according to the present invention is characterized in that the first burner and the second burner have flame holes (2a, 2a).
b) is characterized by being arranged vertically and horizontally. With such a configuration, the flame holding effect can be enhanced.

Further, the burner device of the present invention is characterized in that the first burner side flame hole and the second burner side flame hole (2a, 2b)
The size of b) is different. With such a configuration, necessary fuel gas can be supplied, and the amount of fuel supplied to the burner on the excess air side is increased,
The required amount of combustion can be maintained.

Further, in the burner device according to the present invention, the first burner is provided with a tip ejection section (6) at the center of a flame hole surrounded by a side wall member. A sleeve flame hole (9) is provided. With such a configuration, the stability of combustion can be enhanced, and the flame holding effect of combustion of the second burner can be enhanced.

Further, in the burner device according to the present invention, the second burner is characterized in that a plurality of ribbons (8) are provided and partitioned in a flame hole surrounded by a side wall (7). . With such a configuration, the stability of combustion can be improved.

Further, in the burner device according to the present invention, the first burner is characterized in that a ribbon (10) is installed in a flame hole whose opening side is expanded. With such a configuration, the stability of combustion can be further improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 and FIG. 2 show an embodiment of a burner device according to the present invention. This burner device includes a first burner portion 1a and a second burner portion 1b, and these burner portions 1a, 1b are respectively provided with slit-shaped flame holes 2a, 2b on the upper side.
Are arranged vertically, and a plurality of these burners are arranged adjacently and alternately to constitute a burner. A mixed gas of fuel gas and air having different mixing ratios is individually supplied to the burners 1a and 1b. First and second groups of flame holes A and B are formed in the first and second burner portions 1a and 1b, respectively. The same method as that of a conventional Bunsen burner or the like can be applied.

In such a configuration, a fuel-rich mixed gas is supplied to the burner section 1a, and a fuel-lean mixed gas is supplied to the burner section 1b, so that independent combustion is performed. In this case, the air ratio of the mixed gas supplied to each of the burners 1a and 1b is:
Λ ≒ 0.4 is set on the fuel-rich mixed gas side, and λ ≒ 1.2 to 1.5 on the fuel-lean mixed gas side. The ratio of the amount of fuel gas supplied to the burners 1a and 1b is
Fuel gas amount on a side: Fuel gas amount on burner section 1b side = 3:
It is about 7. That is, the amount of fuel gas supplied to the burner unit 1b is larger than the amount of fuel gas on the burner unit 1a side. As a result, a fuel-rich mixed gas is ejected from the flame holes 2a of the burner portion 1a and burns, and a fuel-lean mixed gas is ejected and burns from the flame holes 2b of the burner portion 1b.

The combustion mode in the mixed gas of the burners 1a and 1b will be described.
Because it is combustion of excess air by fuel-lean mixture gas,
When used alone, the flame 3b becomes unstable due to lift or vibration combustion. On the other hand, the combustion on the burner section 1a side is
Since the combustion is performed by the fuel-rich gas mixture, the flame 3a becomes stable. Each of the flames 3a and 3b is adjacent to each other, and the stable flame 3a of the burner 1a acts as a pilot flame to support the combustion of the burner 1b, thereby stabilizing the combustion of the burner 1b. Flame 3b
The occurrence of side lift and oscillating combustion is prevented.

[0018] Then, the combustion with excess air in the burner portion 1b side by the cooling effect of the excess air, the flame temperature 3b is low temperature, so to maintain it, occurrence of the NO _X is suppressed. In addition, the amount of fuel gas supplied for combustion of the fuel-lean mixed gas becomes larger than the fuel gas on the fuel-rich mixed gas side.
The amount of generation of O _X is also reduced.

Next, FIGS. 3 and 4 show an embodiment of the burner device of the present invention. This burner has a configuration in which a second burner section 4b for burning a fuel-lean mixed gas is provided between a first burner section 4a for burning a fuel-rich mixed gas. In such a burner, the burner portion 4a is provided with a slit-shaped flame hole 5a on the upper side thereof to form the tip ejection portion 6 thinly, and forms a space between the burner portion 4a and the side wall 7. In the burner section 4b, a ribbon 8 is provided at the tip to form a large number of flame holes 5b. Then, as shown in FIG. 4, a sleeve flame hole 9 may be formed on the side of the front end jetting portion 6 of the burner portion 4a as required.

[0020]
. Next, FIG. 5 shows another embodiment of the burner device of the present invention. The burner of this embodiment is shown in FIGS.
In place of the slit-shaped flame hole 5a of the burner portion 4a shown in FIG. 4, a ribbon 10 is provided at the tip end similarly to the burner 4b to form a large number of flame holes 5a. In addition, a side wall 7 for forming a sleeve fire is formed.

With such a configuration, the burners 4a and 4b can be unitized, and a plurality of units can be arranged in line to form a burner having a desired combustion amount. Burner part 4
b is sandwiched between the burner portions 4a on both sides thereof, so that the burner portions 4a, 4a as in the embodiment of FIGS.
A plurality of b may be alternately and continuously arranged in a row to form a burner.

In such a burner, in the burner apparatus of the present invention, in addition to the combustion action described with reference to FIGS. 1 and 2, noise is generated by the rectifying action of the mixed gas in the flame holes 5a and 5b formed by the ribbons 8 and 10. Can be further reduced, and in the case of forming the sleeve flame 11 in the burner 4a,
The flame 12a of the burner 4b can be stabilized along with the stabilization of the flame 12a of the burner 4a.

Next, FIG. 6 shows another embodiment of the burner device of the present invention. In this burner, a large number of flame holes are formed by the ceramic plate 13. Ceramic plate 13
Has a large number of flame holes arranged in a straight line to form first and second flame hole groups A and B, and these flame hole groups A and B are arranged alternately. The diameter of the flame holes 14b of the flame hole group B is smaller than the diameter of the flame holes 14a of the flame hole group A, and the number thereof is increased. In the illustrated example, the flame hole group B is composed of a large number of small diameter flame holes 14b arranged in two rows. A mixed gas having a different mixing ratio between fuel gas and air is supplied to the flame holes 14a and 14b of the flame hole groups A and B by a mixed gas distribution mechanism (not shown).

In the above configuration, the flame holes 14 of the flame hole group A
a to the fuel-rich mixture gas,
The fuel-lean mixture gas is supplied to the flame holes 14b of the first and second combustion chambers to cause the lean combustion. Since the combustion by the flame holes 14b of the flame hole group B is the combustion of the excess air described above, a large number of small diameter flame holes 14b are formed.
It is subdivided by b and burns. Temperature of the flame 15b generation of the NO _X is suppressed it is cooler during. Further, similarly to the above-described embodiment, the flame 15b is formed by the flame 15a of the fuel-rich mixed gas by the flame holes 14a of the flame hole group A.
And the occurrence of lift and vibration combustion can be further suppressed.

When a large number of flame holes are formed by the ceramic plate 13 or the like as in the above-described embodiment, although not shown, the flame holes 14a and 14b of the flame hole groups A and B are vertically and horizontally adjacent. It is good also as a structure arrange | positioned like this.

Further, in the burner of the above embodiment, a fuel-rich mixed gas or a fuel-lean mixed gas is preset and supplied to the burners 1a and 1b or the flame holes of the flame hole groups A and B. However, any of them can be supplied to perform combustion as needed.

Next, FIG. 7 shows the results of the implementation of the burner device of the present invention. The result of this execution is that, in the burner as shown in FIG. 1, the mixing ratio of fuel gas and air in the fuel-rich mixture gas is set to λ = 0.4 to 0.7, and the overall air ratio is The graph shows the amount of NO _X generated when the air ratio of the fuel-lean mixed gas is adjusted so as to be the value shown on the abscissa and burned. The ratio of the amount of combustion by the fuel-lean mixture gas to the amount of combustion by the fuel-rich mixture gas is 7.5: 2.5. The indicated air ratio is a value including the cooling air when the cooling air flows outside the burner, and the air ratio λ in parentheses is a value not including the cooling air. . As described above, it can be seen that the burner device of the present invention significantly reduces the amount of generated NO _X as compared with gas combustion in a conventional general Bunsen burner.

FIG. 8 shows an example of a flame lift limit of a burner section or a group of flame holes for supplying a fuel-lean mixture gas in the burner apparatus of the present invention, in comparison with other examples. A indicates that in the burner device of the present invention, the fuel-lean mixed gas is supplied only to one burner portion or the flame holes of the flame hole group, and the flame of the fuel-rich mixed gas of the other burner portion or the flame hole group is supplied. 3 shows a lift limit when flame holding is not performed, that is, when the burner device of the present invention is not applied, and this limit is about λ = 0.7. In contrast, B
Indicates a lift limit in a conventional general Bunsen burner having a flame holding mechanism, and this limit is λ = 1.3.
It is about. C indicates a lift limit in one burner portion or the flame hole group when the burner device of the present invention is applied, and λ is about 3.0. As described above, in the gas combustion of the burner device of the present invention, compared with the conventional combustion in the conventional general Bunsen burner, the combustion of high excess air can be performed more stably, and NO
_X can be reduced.

[0029]

As described above, according to the present invention,
Since the combustion of the combustion and the fuel rich mixture gas with excess air in the fuel lean gas mixture can coexist, excess can stabilize the combustion of the air, it is possible to reduce the NO _X, can also be suppressed generation of noise.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a burner which is an embodiment of a burner device according to the present invention.

FIG. 2 is an explanatory diagram showing a combustion state of the burner device of FIG.

FIG. 3 is a perspective view of a burner as one embodiment of the burner device of the present invention.

FIG. 4 is a sectional view showing a combustion state in the burner device of FIG. 3;

FIG. 5 is a sectional view showing a combustion mode of a burner and the like.

FIG. 6 is a perspective view of a burner as another embodiment of the burner device of the present invention.

Figure 7 shows a comparison of the NO _X generation amount in the burner device and the gas-fired conventional Bunsen burner of the present invention.

FIG. 8 is a diagram showing a flame lift limit in the gas combustion method of the burner device of the present invention and the conventional combustion method.

[Explanation of symbols]

 1a, 4a First burner portion 1b, 4b Second burner portion 2a, 2b Flame hole 3a, 3b Flame 5a, 5b Flame hole 6 Tip ejection portion 7 Side wall 8, 10 Ribbon 12a, 12b Flame 14a, 14b Flame hole 15a , 15b flame

Continued on the front page (72) Inventor Kimio Mochizuki 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Inside Takagi Industry Co., Ltd.

Claims (6)

[Claims] A first burner and a second burner having independent flame holes, wherein the first and second burners are alternately arranged adjacent to each other, and the first burner and the second burner are arranged alternately. The ratio of the fuel gas supplied to the burner is made different, the air amount of the first burner is made different from the air amount of the second burner, and a fuel-rich mixed gas is supplied to the first burner, and the second burner is supplied to the second burner. A burner apparatus characterized in that a fuel-lean mixture gas is supplied and burned, and the flame on the second burner side is maintained by the flame on the first burner side. 2. The burner device according to claim 1, wherein the flame holes of the first burner and the second burner are arranged vertically and horizontally. 3. The burner device according to claim 1, wherein the size of the first burner side flame hole is different from that of the second burner side flame hole. 4. The first burner is characterized in that a front end ejection portion is provided at a central portion of a flame hole surrounded by a side wall member, and a sleeve flame hole is provided in a member forming the front end ejection portion. The burner device according to claim 1. 5. The burner device according to claim 1, wherein the second burner is divided by providing a plurality of side walls in a flame hole surrounded by the side walls. 6. The burner device according to claim 1, wherein the first burner has a ribbon installed in a flame hole formed by expanding an opening side.