JPH1047616A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a combustion device compact by increasing a packing or mounting density of burner units, wherein a plurality of flat-plate burner units which have air and fuel introducing portions at positions apart from burner port portions respectively are arranged in a housing in parallel and collectively, and the burner port portions form a burner port portion face. SOLUTION: Each burner unit 1a has the width of the upper and lower portions of a burner body thereof set to be greater than the width of the upper and lower portions of a burner body of each burner unit 1b. Introducing portions 4a of the burner units 1a are arranged laterally and in parallel at a position below the introducing portions 4b of the burner units 1b. The introducing portions 4b of the burner units 1b are disposed between the upper portions of the burner bodies of the burner units 1a laterally and in parallel. Due to such a construction, even when the burner units 1a have introducing portions 4a of a large diameter and mixing tube portions, the burner units 1a, 1b can be arranged such that a gap defined between the neighboring upper portions of the burner units 1a, 1b can be made as narrow as possible. Accordingly, the burner units 1a, 1b can be packaged or mounted highly densely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus suitable for home use and small business use.

[0002]

Nitrogen oxides contained in the combustion gas generated in the burner of the Related Art Various combustion apparatus (NO _X) is itself harmful, and are released into the atmosphere of acid rain and photochemical smog It is said to be the cause. Therefore, the burner to be used in the combustion apparatus, various measures to reduce the generation amount of NO _X have been taken.

[0003]

The conventional countermeasures are for a large-sized combustion device for industrial use or the like, which is legally regulated. Therefore, it cannot be said that sufficient measures have been taken. In a large combustion device, since the static pressure of the combustion fan can be increased, the flow of combustion gas and air can be easily controlled, the layout of the burner has a high degree of freedom, and noise control is easy. controlling condition is less stringent in against, and because the combustion chamber made large, which makes it easy to complete combustion be subjected to NO _X reduction measures so-called slow combustion. On the other hand, a small-sized combustion device cannot obtain a large static pressure of the combustion fan, it is difficult to control the flow of combustion gas and air, the degree of freedom in the layout of the burner is low, noise measures are troublesome, since the controlling condition against severe, also the combustion chamber can not be taken large, nO _X reduction measures are difficult in comparison to large combustion apparatus.

[0004] Therefore, an object of the present invention is to provide a combustion apparatus that increases the amount of combustion, suppresses the generation of nitrogen oxides, and reduces noise.

[0005]

As shown in FIGS. 1 to 10, a combustion apparatus according to the present invention improves the mounting density of burners (burner units 1a and 1b) to increase the amount of combustion and to reduce the fuel consumption. By stably performing the combustion of the mixed gas, generation of nitrogen oxides is suppressed and noise is reduced.

In the combustion apparatus of the present invention, the flame hole (3
a, 3b) and an introduction section (4a, 4b) for introducing air and fuel gas to a position separated from the flame hole section
A plurality of flat plate-shaped burner units (first burner unit 1a, second burner unit 1b) having a shape are assembled in a housing member (support box body 13), and a flame hole portion surface is formed by the flame hole portion. Is formed. Since a plurality of independent burner units are assembled to form a single combustion device, the ratio of air to fuel gas for each burner unit can be set arbitrarily. Various combustion modes can be set, such as using gas combustion in combination. In addition, the maximum combustion amount of this combustion device is proportional to the number of burner units, and the maximum combustion amount can be set freely by adjusting the number of burner units at the manufacturing stage, thereby increasing the degree of freedom of the required combustion amount. Can be provided.

The combustion device of the present invention has a flame hole on the upper side and introduces air and fuel gas into a position separated from the flame holes (3a, 3b).
A plurality of first and second burner units (1a, 1b) having a flat plate shape are alternately arranged and assembled in a housing member, and the flame holes of the first and second burner units are provided. And a fuel-lean mixed gas is supplied to the first burner unit, and a fuel-rich mixed gas is supplied to the second burner unit.

With such a configuration, a fuel-lean gas mixture is ejected from the flame holes of the burner unit and burns,
A fuel-rich gas mixture is ejected from the burner hole of the burner unit and burns. Combustion of excess air with a fuel-lean gas mixture alone has poor flame stability, but there is a stable flame with a fuel-rich gas mixture adjacent to these flames. Acts as a pilot flame and stabilizes the flame of excess air. Therefore, no flame lift or oscillating combustion occurs, and the generation of noise is suppressed.

Since the combustion of the fuel-lean mixed gas stabilized by the flame of the fuel-rich mixed gas is 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. Also, since the amount of fuel gas provided for combustion as a fuel-lean mixed gas is larger than the amount of fuel gas provided for fuel-rich mixed gas, the amount of NO _X generated relative to the burned amount of the entire burner is also reduced. Few.

The combustion apparatus according to the present invention is characterized in that the flame hole (3a) of the second burner unit projects from the flame hole (3a) of the first burner unit. By locating the flame of the fuel-rich gas mixture above the first burner unit, the flame holding property is enhanced.

In the combustion apparatus of the present invention, the first burner unit or the second burner unit includes a flat burner body (2a, 2b) and a flame hole formed on an upper side of the burner body. Part (3a, 3b) and an introduction part (4a, 4b) for introducing fuel gas and air to a position separated from the flame hole.
4b) and a mixing pipe section (5a, 5b) formed at a portion extending from the introduction section to the flame hole section. With such a configuration, the necessary fuel gas and air are individually applied to each independent burner unit, and a gas mixture optimal for combustion can be injected from the flame hole, and a stable flame can be maintained. .

In the combustion apparatus according to the present invention, the introduction portion is formed at a side edge of each burner unit. By adopting such a configuration, it is easy to install the air or fuel gas supply means, which contributes to downsizing of the combustion device.

In the combustion apparatus according to the present invention, the introduction portions of the first burner unit and the introduction portions of the second burner unit are alternately arranged. With such a configuration, the mounting density is increased, and the combustion device is downsized and stiffened.

In the combustion apparatus according to the present invention, the burner body of the first burner unit has a thin upper portion and a thick lower portion, a flame hole formed at an upper end of the upper portion, and a lower portion having a flame hole. The introduction section and the mixing pipe section are provided.
Such a configuration increases the mounting density and contributes to downsizing of the combustion device.

[0015] In the combustion apparatus according to the present invention, the second burner unit is provided within a space above the first burner unit. With this configuration, the first burner unit locates the fuel gas and air introduction sections below the introduction section of the second burner unit, and arranges these introduction sections in two levels. With this configuration, the first and second burner units can be arranged at high density by alternately arranging them. At this time, the upper part constituting the flame hole of the first burner unit is
If the lower part of the second burner unit is configured to be thinner than the lower part constituting the introduction part and the mixing pipe part, and the lower part of the second burner unit is made to correspond to these adjacent upper parts, higher-density mounting is possible Become.

The distance from the inlet of the first burner unit to the flame hole is longer than that of the second burner unit, so that the fuel gas and the air can be mixed well. Therefore, in the first burner unit, a large amount of the mixed gas in which the fuel is lean and uniformly mixed can be supplied to the flame hole.

[0017]

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

FIGS. 1 to 4 show a burner unit constituting the combustion apparatus of the present invention. FIG.
A first burner unit 1a shown in FIG. 4 and a second burner unit 1b shown in FIG. These burner units 1
a and 1b are respectively vertical flat burner bodies 2a,
The fuel gas and air inlets 4a and 4b are provided on the upper side of the flame holes 3a and 3b and on the lower side of the lower part 2b.
And mixing tube portions 5a and 5b extending from the nozzles to the flame hole portions 3a and 3b. And the burner unit 1a is
The vertical width of a is formed wider than the vertical width of the burner body 2b of the burner unit 1b, and the distance from the introduction portion 4a to the flame hole portion 3a is set longer than that of the burner unit 1b.

Burner body 2 of burner units 1a and 1b
a, 2b have a thin upper portion u and a thick lower portion d, the upper end of the upper portion u is provided with flame holes 3a, 3b, and the lower portion d has introduction portions 4a, 4b. Mixing pipe section 5a, 5
b is formed. The flame holes 3a, 3b are located on the upper part u
The upper long slit openings 6a and 6b are narrowed at predetermined intervals to form a plurality of short slit openings arranged in a line. In addition, a large number of slits are arranged in the flame holes 3a and 3b in the transverse direction.

The introduction portions 4a and 4b are formed as openings that open at one end of the lower portion d, and throat portions 7a and 7b are formed inside the openings. Then, the mixing pipe section 5 that extends from the throat sections 7a and 7b to the other end of the lower section d and returns to the lower end of the upper section u
a, 5b are provided. Also, the burner unit 1a
The inlet 4a and the mixing tube 5b are set to have a larger diameter than those of the burner unit 1b, so that a larger amount of fuel gas and air can be introduced.

Each of the burner units 1a and 1b has an upper portion u formed with narrow portions 8a and 8b crossing the upper portion u. The burner unit 1a is located upstream of the narrow portion 8a at predetermined intervals. The rectification part is formed by forming the constriction part 9. Outside the upper part u of the burner unit 1b, a sleeve fire forming plate 10 is provided as shown in FIG.
A mixed gas outlet (not shown) for forming a sleeve fire is provided in the upper part d corresponding to the sleeve fire forming plate 10. These are merely examples, and each component can be appropriately configured.

Next, FIGS. 5 to 8 show the burner unit 1a,
1b shows a burner as a combustion device configured with 1b. FIG. 5 is an overall plan view partially omitted, and FIG. 6 is an air chamber 11 and first and second nozzle holders 12a and 12a.
FIG. 7 is an enlarged front view of a main part showing a configuration and a combustion state by enlarging a main part of FIG.
FIG. 8 is a side view.

Each burner unit 1a, 1b
a and 3b are housed in the support box 13 which is a housing member in an alternately arranged state with the same height or a slight height difference. In this embodiment, as shown in FIG. 6 and FIG. 7, the height of the flame hole 3a of the burner unit 1a is set slightly lower than the height of the flame hole 3b of the burner unit 1b. It is installed at a height substantially equal to the upper end of the plate 10. As is clear from FIGS. 5 and 6, burner units 1b are provided at both ends of the burner unit 1a.

As described above, the burner unit 1a is configured such that the vertical width of the burner body 2a is wider than the vertical width of the burner body 2b of the burner unit 1b, as shown in FIGS. 6, 7 and 8. The introduction portions 4a of the burner unit 1a are arranged side by side in a row below the introduction portion 4b of the burner unit 1b. And the introduction part 4b of the burner unit 1b is arranged in a horizontal line between the upper part u of the burner body 2a of the burner unit 1a, and the burner unit 1a has the large diameter introduction part 4a and the mixing pipe part 5a. Regardless, the upper member u adjacent to the burner units 1a and 1b
The space between them is narrow. Therefore, the burner units 1a and 1b can be mounted at a high density.

The support box 13 has burner units 1a, 1
b, upper and lower nozzle holders 12a and 12b corresponding to the upper and lower rows of the respective introduction portions 4a and 4b, that is, a lower nozzle holder 12a corresponding to the burner unit 1a;
Upper nozzle holder 1 corresponding to burner unit 1b
2b is installed. These nozzle holders 12
a and 12b are installed in an air chamber 11 having an open front side, and air is supplied from a fan 14 into the air chamber 11.

And, these nozzle holders 12a, 1
2b is provided with nozzles 15a and 15b for ejecting fuel gas corresponding to the respective introduction portions 4a and 4b. The diameters and positions of these nozzles 15a and 15b and the opening diameters of the introduction portions 4a and 4b satisfy the following conditions. These components corresponding to the burner unit 1a supply the fuel-lean mixed gas whose fuel gas amount is larger than the supply amount to the burner unit 1b to the flame hole 3a. The above components corresponding to the burner unit 1b satisfy the condition for supplying the fuel-rich mixed gas to the flame hole 3b. For example, the air ratio of the mixed gas supplied to the flame holes 3a and 3b of the burner units 1a and 1b is λ ≒ 1.2 to 1.5 and λ ≒ 0.4, respectively, assuming that the theoretical air amount λ = 1. It can be set as follows. The ratio of the amount of fuel gas supplied to each of the flame holes 3a, 3b is, for example, the first burner unit 1a.
Fuel gas amount on the side: fuel gas amount on the second burner unit 1b side = 8: 2 to 6: 4. This is an example, and the air ratio and the fuel gas amount ratio are not limited to these ranges, but can be set appropriately beyond these ranges.

Next, FIG. 9 shows a state related to the nozzle holder when viewed from the back side of the nozzle, and FIG. 10 shows a state viewed from the side. Each of the nozzle holders 12a and 12b is divided into left, right and middle portions 1, r, and m by partitioning plates 16a and 16b. Each of the portions is connected to a communication pipe 171, 17r, and 17m, and each fuel gas Supply pipes 181, 18r, and 18m are provided. As is clear from the arrangement of the nozzles 15a, 15b, a large number of burner units 1a, 1b
Burner units 1b are provided at both ends of the burner
Is installed. The burner units 1b corresponding to the nozzles 15b at both ends of the intermediate portion m of the nozzle holder 12b are adjacent to the outside of the burner units 1a corresponding to the nozzles 15a at both ends of the intermediate portion m of the nozzle holder 12a.

In the burner thus configured, the fuel gas is supplied to all the fuel gas supply pipes 181, 18r, and 18m. Fuel gas is supplied to the nozzle holders 12a and 12b through the communication pipes 171, 17r and 17m, and air is supplied from the fans 14a and 14b into the air chamber 11 to perform combustion.

The fuel gas supplied to the nozzle holders 12a and 12b is blown out from the nozzles 15a and 15b in the direction of the inlets 4a and 4b of the corresponding burner units 1a and 1b. It is introduced into the burner bodies 2a, 2b while sucking. The fuel gas and the air introduced into the burner bodies 2a and 2b from the introduction sections 4a and 4b as described above are mixed while mixing the fuel gas and the air.
b moves to each of the flame holes 3a and 3b, from which it is ejected as a mixed gas for combustion. At this time, the fuel-lean mixed gas is blown out from the flame hole 3a of the burner unit 1a, and the flame hole 3b of the burner unit 1b.
A fuel-rich gas mixture gushes from the burner unit 1
The amount of fuel gas contained in the mixed gas ejected from the flame hole 3a is larger than the amount of fuel gas contained in the mixed gas ejected from the flame hole 3b of the burner unit 1b.

By the supply of the mixed gas as described above, a flame (first flame 19a) formed by burning the fuel-lean mixed gas is formed above the flame hole 3a of the burner unit 1a. Above the flame hole 3b, there is a flame (second flame 19) caused by the combustion of the fuel-rich mixture gas.
b) is formed. At this time, since the burner unit 1b is located at both ends of the burner unit 1a, the flame 19
The flame 19b is present on both sides of a.

Since the flame 19a is due to combustion of a fuel-lean mixed gas, the stability is poor alone, but the flames 19b located on both sides thereof are stable due to the combustion of a fuel-rich mixed gas. The stable flame 19b acts as a pilot flame to stabilize the flame 19a.
Therefore, the lift of the flame 19a and the oscillating combustion hardly occur,
Generation of noise is suppressed.

Incidentally, the flame 19 caused by the fuel-lean combustion is used.
The stability of a is also affected by the mixing state of the mixed gas, and the stability is poor if the mixing is not sufficiently uniform. In this regard, in the combustion apparatus of the present invention, the distance from the introduction portion 4a of the burner unit 1a to the flame hole 3a is longer than that of the burner unit 1b. Therefore, the mixing distance is long, so that the fuel gas and the air are well mixed, and even if the fuel is lean, a large amount of the mixed gas uniformly mixed can be supplied to the flame hole 3a. For this reason,
In the combustion device of the present invention, the stability of the flame 19a is also good in this respect.

[0033] The combustion of the fuel lean mixture gas is stabilized by as described above, excessive since air is a combustion temperature of the flame 19a is kept cool by the cooling effect NO _X
Is reduced. In addition, since the amount of fuel gas provided for combustion as a fuel-lean mixed gas is larger than the amount of fuel gas provided for fuel-rich mixed gas, NO _{X with} respect to the burned amount of the entire burner is increased. The amount of generation is also small.

Next, in the above combustion state, the supply of the fuel gas from the fuel gas supply pipe 18r on the right side in FIG. 9 is stopped, and the right and left portions r of the first and second nozzle holders 12a and 12b are stopped. When the supply of the fuel gas is stopped, the first and second burner units 1a and 1b corresponding to the nozzles 15a and 15b in this portion are extinguished, and the nozzle holder 12
a, the middle part m of 12b and the nozzle 15a of the left part 1;
Combustion of only the burner units 1a and 1b corresponding to 15b continues.

The burning burner units 1a, 1
Since the second burner unit 1b is located on both ends of the group b, the second flame 19b always exists on both sides of the first flame 19a as in the above-described combustion state. The stabilizing action of the first flame 19a by the second flame 19b is not hindered.

Next, in the above combustion state, when the supply of the fuel gas from the intermediate fuel gas supply pipe 18m is stopped, only the burner units 1a and 1b corresponding to the intermediate portion m of the nozzle holders 12a and 12b are burned. To continue. In this combustion state, since the flame 19b always exists on both sides of the flame 19a, the flame 1
The stabilizing action of 9a is not inhibited.

Thus, in the above embodiment, the flame 1
The flame hole area to be burned can be changed stepwise without obstructing the stabilizing action of the flame 19a by the flame 9a. Therefore, by using a well-known combustion amount control method such as proportional control, a wide range can be obtained. The adjustment of the amount of combustion can be suitably performed.

FIG. 11 shows NO in the combustion apparatus of the present invention.
_It shows an example of _X emission characteristics. In this example, in the burner shown in the figure, the air ratio of the fuel-rich mixed gas in the second burner unit 1b is set to λ = 0.4 to 0.5.
Of the NO _X when the air ratio of the entire burner while set to 7 were burned by adjusting the air ratio of the fuel lean mixture gas in the first burner units 1a to a value shown in abscissa It shows the amount of generation. The indicated air ratio is a value including the cooling air when the cooling air flows around the burner units 1a and 1b, and the air ratio in parentheses does not include the cooling air. Value. The ratio between the amount of fuel gas burned in the burner unit 1a and the amount of fuel gas burned in the burner unit 1b is 7.5: 2.5. As shown in the figure, in the combustion device of the present invention, it can be seen that the generation amount of NO _X is significantly reduced as compared with the conventional general Bunsen burner.

FIG. 12 shows an example of the lift limit of the flame 19a by the burner unit 1a of the combustion apparatus according to the present invention, in comparison with the others. A shows the lift limit of the burner unit 1a when the fuel-lean mixture gas is supplied only to the burner unit 1a and the flame holding of the burner unit 1b by the second flame is not performed in the combustion apparatus of the present invention. , This limit is about λ = 0.7. On the other hand, B indicates a lift limit in a conventional general Bunsen burner having a flame holding mechanism, and this limit is about λ = 1.3. C indicates the lift limit of the burner unit 1a when the burner units 1a and 1b of the combustion device of the present invention are burned, and is about λ = 3.0. Thus, the combustion device of the present invention, compared with the conventional general Bunsen burner,
Higher excess air stably performed combustion, it is understood that it is possible to reduce of the NO _X from the combustion of high excess air.

[0040]

As described above, the present invention has the following effects. a. Increasing the mounting density of the burner unit, increasing the amount of combustion,
Generation of nitrogen oxides can be suppressed and noise can be reduced. b. The first burner unit for burning the fuel-lean mixture and the second burner unit for burning the fuel-rich mixture can be densely mounted alternately, and a compact and large-burning combustion device can be provided. c. Since the ratio of the amount of fuel gas supplied to the combustion of the excess air is large, the amount of NO _X generated relative to the combustion amount of the entire combustion device can be reduced. d. The combustion of the excess air can be performed stably without causing the lift of the flame or the oscillating combustion, so that the generation of noise can be suppressed. e. Since the fuel-lean mixture gas can mix the fuel gas and air for each burner unit, flashback when mixing is not performed smoothly due to clogging and the like becomes local, generating loud noises and burning equipment. Damage can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first burner unit which is one embodiment of a combustion device of the present invention.

FIG. 2 is a cross-sectional view of the combustion device shown in FIG. 1 taken along line XX.

FIG. 3 is a sectional view taken along line YY of the combustion device shown in FIG.

FIG. 4 is a perspective view showing a second burner unit which is one embodiment of the combustion device of the present invention.

FIG. 5 is a plan view showing a part of a burner, which is one embodiment of the combustion apparatus of the present invention, with a part thereof omitted;

FIG. 6 is a front view of a burner, which is one embodiment of the combustion apparatus of the present invention, with a part cut away.

FIG. 7 is an enlarged front view showing a main part of a part of the combustion device of FIG. 6;

FIG. 8 is a side view showing a configuration of a burner which is one embodiment of the combustion device of the present invention.

FIG. 9 is a front view of the nozzle holder constituting the combustion apparatus of the present invention, viewed from the back side with respect to the nozzle.

FIG. 10 is a side view of the nozzle holder shown in FIG.

11 is a diagram showing a comparison of the combustion apparatus and NO _X generation amount of conventional Bunsen burner of the present invention.

FIG. 12 is a diagram illustrating a flame lift limit of a burner unit.

[Explanation of symbols]

 1a 1st burner unit 1b 2nd burner unit 2a, 2b Burner body 3a, 3b Flame hole 4a, 4b Introducing part 5a, 5b Mixing pipe part 13 Support box (housing member)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kimio Mochizuki 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Inside Takagi Industries Co., Ltd. (72) Inventor Shigetoshi Akiyama 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Takagi Inside the corporation

Claims (8)

[Claims] A plurality of flat burner units having a flame hole on an upper side and an introduction portion for introducing air and fuel gas at a position separated from the flame hole are provided in a housing member. A combustion device, wherein the flame hole portion surface is formed by the flame hole portion. 2. A plurality of first and second burner units each having a flat plate shape having a flame hole on an upper side and having an introduction portion for introducing air and fuel gas at a position separated from the flame hole. Are arranged alternately in a housing member, and a flame hole surface is formed by the flame holes of the first and second burner units, and a fuel-lean mixed gas is provided in the first burner unit. And a fuel-rich gas mixture is supplied to the second burner unit. 3. The combustion apparatus according to claim 2, wherein the flame hole of the second burner unit projects from the flame hole of the first burner unit. 4. The first burner unit or the second burner unit, a burner body having a flat plate shape, a flame hole formed on an upper side of the burner body, and being separated from the flame hole. 3. The combustion apparatus according to claim 2, further comprising: an introduction portion for introducing fuel gas and air to the position; and a mixing pipe portion formed at a portion extending from the introduction portion to the flame hole. 5. The burn-in unit according to claim 1, wherein the introduction portion is formed at a side edge of each burner unit.
Or the combustion device according to claim 4. 6. The combustion apparatus according to claim 2, wherein the introduction portions of the first burner unit and the introduction portions of the second burner unit are alternately arranged. 7. The burner body of the first burner unit has a thin upper portion and a thick lower portion, a flame hole formed at an upper end of an upper portion, and the introduction portion and the mixing pipe at a lower portion. The combustion device according to claim 2 or 4, wherein a part is disposed. 8. The combustion device according to claim 7, wherein the second burner unit is installed within an interval on an upper side of the first burner unit.