JPH07151317A - Thick and thin fuel combustion device - Google Patents

Abstract

PURPOSE:To permit a large turn down ratio while contriving the simplification of structure and improvement of air and fuel mixing property. CONSTITUTION:In a constitution wherein flat type thick fuel combustion burner 3, in which a thick flame port 7, a thick mixing chamber 8 and a thick fuel introducing port 9 are formed, are provided in parallel with a predetermined space, a thin combustion burner, provided with a thin flame port, a thin mixing chamber and a thin introducing port, is formed between neighboring thick combustion burners 3 and a thick gas supplying means 14, supplying fuel gas into the thick fuel introducing port 9, as well as air supplying means 4, 5, supplying air into thick fuel and thin fuel introducing port 9 respectively, are provided, a thin fuel gas introducing passage 16, guiding thin mixture fuel gas, is formed in the thick fuel combustion burner 3. A plurality of injection ports 18, injecting the fuel gas of the thin gas introducing passage 16 into the thin mixing chamber, are arranged while being distributed in the lengthwise direction of the thin flame port to form the side wall section of the thick fuel combustion burner 3 while a thin gas supplying means 20, supplying fuel gas into the thin gas introducing passage 16, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rich upper flame outlet for discharging a rich air-fuel mixture, a rich mixing chamber communicating with the rich upper flame orifice, and a fuel gas and a combustion chamber for the rich mixing chamber. A flat-shaped rich combustion burner formed with a rich inlet for introducing air is arranged side by side at a predetermined interval, and a light upper flame outlet for discharging a light air-fuel mixture,
A lean combustion chamber that communicates with the light burn upper flame port, and a burner for lean burn that includes a lean burn inlet that introduces combustion air into the lean burn chamber, using the rich burner as a constituent member. , A rich gas supply means which is formed between adjacent burners for rich combustion and supplies a fuel gas to the rich inlet, and a burn gas for each of the rich inlet and the light lean inlet. The present invention relates to a rich / lean combustion device provided with an air supply means for supplying air.

[0002]

2. Description of the Related Art In the above rich / lean burner (see FIGS. 8 and 9), the flat rich burner 3 is used as a constituent member of the lean burner 6 so that the adjacent rich burners 3 are adjacent to each other. By forming the light burner burner 6 therebetween, the light burner burner 6 positioned between the adjacent rich burner burners 3 is configured as an exclusive member different from the rich burner burner 3 as compared with the device structure. In order to simplify the burner structure as well as the fuel gas supply structure for the lean burner 6, the following device configuration was previously proposed ( See Japanese Patent Application No. 4-266907).

That is, as shown in FIGS. 8 and 9, a plurality of ejection ports 18 for ejecting a part of the air-fuel mixture in the rich mixing chamber 8 to the light mixing chamber 11 are provided in the light upper flame port 10. The fuel gas for producing a lean mixture is formed by being dispersedly arranged in the longitudinal direction on the side wall portion of the burner 3 for rich combustion, and the fuel gas for producing a lean mixture is ejected from the jets 18 of these dispersed arrangements in the longitudinal direction of the lean upper flame port 10. The burner 6 is supplied in a state that is as uniform as possible in the direction.

Then, as another method, there is provided a gas dispersion supply structure for light combustion in which the fuel gas for generating the light air-fuel mixture is dispersed in the longitudinal direction of the upper flame nozzle 10 for light combustion and is supplied to the light mixing chamber 11. In comparison with the case where a dedicated member other than the rich combustion burner 3 is provided and an auxiliary equipment is provided for each of the light burn burners 6, by adopting the above-mentioned jet outlet configuration, the dedicated burn member This eliminates the need to construct and equip a gas distribution and supply structure for use, thereby further simplifying the structure.

In FIGS. 8 and 9, 7 is an upper flame outlet for rich, 9 is a rich inlet for introducing fuel gas and combustion air into the rich mixing chamber 8, and 12 is a light mixing chamber 11. A light introduction port for introducing combustion air, 14 is a gas nozzle as a concentration gas supply means for supplying fuel gas to the concentration introduction port 4,
Reference numerals 5 and 5 are a fan and an air chamber as air supply means for supplying combustion air to the rich inlet 9 and the light inlet 12, respectively.

[0006]

However, the above-mentioned proposed structure in which a part of the air-fuel mixture in the rich mixing chamber 8 is jetted from the plurality of jet outlets 18 to the light mixing chamber 11 can simplify the structure of the device. At the same time, although a light air-fuel mixture having a uniform mixed state can be discharged from the light-air upper flame port 10, a fuel gas for producing a light-air mixture is jetted and supplied from the jet outlet 18 to the light-air mixing chamber 11 in a rich air-fuel mixture state. And the distribution ratio of the fuel gas on the rich combustion side, which is originally sent from the rich mixing chamber 8 to the rich upper flame port 7 in a rich mixture state, the distribution ratio is a predetermined amount from the rich gas supply means 14. Even if the opening area of the jet port 18 and the opening areas of the flame openings 7 and 10 are designed so as to have a constant ratio with respect to the fuel gas supply of the rich gas supply means 14
If the amount of fuel gas supplied from the fuel cell is changed (that is, the input of the entire rich / lean combustion device is changed), the distribution ratio may change correspondingly.

Due to the eventual change of the distribution ratio, the fuel gas for producing the light air-fuel mixture tends to be less than the fuel gas for the rich combustion side, or conversely, the fuel gas for producing the light air-fuel mixture is changed. In comparison, since the fuel gas on the rich combustion side tends to be too small, the combustion in each of the rich combustion burner 3 and the light combustion burner 6 is stabilized in a good state against the above input change. Therefore, there is a problem that the so-called turndown ratio (in other words, input adjustable range) becomes a limited device.

An object of the present invention is to effectively eliminate the above-mentioned problems while simplifying the structure of the apparatus and improving the mixing property of the light air-fuel mixture by rational improvement.

[0009]

[Means for Solving the Problems]

[First Characteristic Configuration] A first characteristic structure of a rich-lean combustion device according to the present invention is a rich upper flame port for discharging a rich air-fuel mixture, a rich mixing chamber communicating with the rich upper flame port, and a rich fuel chamber for the rich fuel chamber. Flat rich combustion burners having a rich inlet for introducing fuel gas and combustion air into the mixing chamber are arranged in parallel at a predetermined interval, and a lean upper flame outlet for discharging a lean air-fuel mixture and its light A burner for light combustion provided with a light mixing chamber communicating with the upper flame port for combustion, and a light introducing port for introducing combustion air into the light mixing chamber, using the rich combustion burner as a constituent member A rich gas supply unit that is formed between matching rich burners and supplies a fuel gas to the rich inlet, and combustion air to each of the rich inlet and the lean inlet. In the structure provided with the air supply means for supplying, the light gas guide for passing the fuel gas for generating the light air-fuel mixture is conducted. A plurality of ejection ports for ejecting the fuel gas, which is guided by the light-gas mixing passage, into the light-mixing chamber, while forming a passage in the thick-burning burner by partitioning the passage from the thick-mixing chamber; Distributing gas is formed in the side wall portion of the rich combustion burner by being dispersed in the longitudinal direction of the light burn upper flame port, and fuel gas is supplied to the lean gas supply passage separately from the rich gas supply means. There is provision of supply means.

[Second Characteristic Configuration] A second characteristic configuration of the rich-lean combustion device according to the present invention specifies a configuration suitable for carrying out the first characteristic configuration. The fuel gas supply means supplies the combustion gas from the air supply means and the fuel gas supply means supplies the combustion gas from the air supply means.

[0011]

[Action]

[Operation of First Characteristic Configuration] That is, in the first characteristic configuration, for the generation of the rich mixture, the rich gas supply means and the air supply means supply the fuel gas and the combustion air to the rich introduction port. As a result, a rich mixture is produced in the rich mixing chamber of the rich burner, and this rich mixture is discharged from the rich upper flame port of the rich burner.

On the other hand, for the production of the lean gas mixture, the lean gas supply passage separate from the rich mixing chamber and formed in the rich combustion burner is supplied to the lean gas supply means other than the rich gas supply means. By supplying the fuel gas by the means, a plurality of ejection ports formed in the side wall portion of the rich combustion burner in a state in which the conduction fuel gas in the light gas passage is dispersed in the longitudinal direction of the light upper flame nozzle. From the light-burning burner to the light-mixing chamber, and in parallel to this, by supplying combustion air to the light-burning inlet of the light-burning burner by means of an air supply means, An air-fuel mixture is mixed and produced, and this light air-fuel mixture is discharged from the light upper burner of the light combustion burner.

[Operation of Second Characteristic Configuration] In the second characteristic configuration, the fuel gas and the combustion air are supplied to the above-described light gas communicating passage by the light gas supply means and the air supply means. The fuel gas and the combustion air are pre-mixed in the course of the passage in the fresh gas passage to form the fuel gas for producing the lean mixture, Is jetted and supplied to the mixing chamber for light from the plurality of jet outlets in the state of the air-fuel mixture.

[0014]

【The invention's effect】

[Effects of First Characteristic Configuration] That is, according to the first characteristic structure of the present invention, fuel is separately supplied to the rich mixing chamber and the light gas communicating passage, which are partitioned from each other, by the rich and light gas supply means. Since the gas is supplied and the conductive fuel gas in the light gas communication passage is jetted and supplied as the fuel gas for producing the light air-fuel mixture from the plurality of jet outlets to the light-air mixing chamber, the fuel gas supply amount of the entire rich-lean combustion device is reduced. Regardless of a change (input change), etc., the rich gas supply means or the light gas supply means is adjusted so that combustion in each of the rich burn burner and the lean burn burner is maintained well. It is possible to appropriately adjust the fuel gas ratio between the combustion side and the light combustion side, which makes it possible to adjust the turndown ratio (that is, the input adjustable range) compared to the previously proposed configurations shown in FIGS. 8 and 9 described above. ) Larger It can be a thick and thin fuel combustion apparatus.

Regarding the mixing property of the light air-fuel mixture and the apparatus configuration, as in the previously proposed configuration shown in FIGS. 8 and 9 described above, a plurality of jet nozzles dispersedly arranged on the side wall portion of the burner for rich combustion. By adopting a mode in which the fuel gas for producing the light air-fuel mixture is jetted and supplied to the light-air mixing chamber, it is possible to secure a high mixing effect in the light-air mixing chamber also in the longitudinal direction of the light-air upper flame port, It is possible to stably deliver a light air-fuel mixture in a uniform mixed state to the light-air upper flame tip, and in the state where the fuel gas for producing the light-air mixture is thus dispersed in the longitudinal direction of the light-air upper flame mouth. Compared to the configuration in which the gas distribution and supply structure for lean combustion that is supplied to the light mixing chamber is composed of a dedicated member separate from the burner for rich combustion, the construction and equipment of a gas dispersion and supply structure using such dedicated separate members is provided. By making it unnecessary, the effect of simplifying the overall device configuration It can be achieved.

[Effect of Second Characteristic Configuration] If the second characteristic configuration of the present invention is adopted, the fuel gas for producing the light air-fuel mixture which is jetted into the light-air mixing chamber is supplied to the air for combustion in the light-air passage for light air. In addition, since it is pre-mixed and is jetted and supplied to the light-mixing chamber from a plurality of jet ports in the state of air-fuel mixture, the mixed state of the light-air mixture discharged from the light-flame upper flame port can be more effectively uniformized, As a result, it is possible to more effectively achieve the improvement of the combustibility of the rich / lean combustion device as a whole.

[0017]

EXAMPLES Next, examples will be described.

1 to 3 show a rich / lean combustion device as a burner unit used in a hot water supply device or the like, in which a flat rich burner 3 for flat combustion is provided at predetermined intervals inside a box-shaped frame body 2 installed in a burner case 1. In the bottom of the burner case 1 below the box-shaped frame 2, an air chamber 5 is formed as an air supply means in which a discharge port 4a of a combustion air supply fan 4 is opened.

Further, the flat burners 3 for rich combustion are arranged side by side at a predetermined interval as described above, so that the adjacent burners 3 for rich combustion function as the burner 6 for light combustion. In this way, the burner 3 for rich combustion is used as a burner constituent member to form the burner 6 for light combustion that is positioned between the adjacent burners 3 for rich combustion, thereby simplifying the overall apparatus configuration. is there.

The rich combustion burner 3 discharges a rich air-fuel mixture having a low primary air ratio, a rich upper flame port 7, a rich mixing chamber 8 communicating with the rich upper flame port 7, and a rich combustion chamber. A rich side inlet 9 for introducing combustion air for producing a rich mixture and fuel gas is formed in the mixing chamber 8. On the other hand, for a lean combustion formed between the rich burners 3 Burner 6
An upper light burner outlet 10 for discharging a light air fuel mixture having a large primary air ratio, and a lighter mixing chamber 1 communicating with the upper light burn outlet 10 for light use.
1, and a lighter lower inlet 12 for introducing combustion air into the lighter mixing chamber 11, to the lighter lower inlet 12 for air conditioning forming the bottom wall of the box-shaped frame 1. Combustion air is supplied upward from the air chamber 5 through the perforated plate 13.

Reference numeral 14 denotes a rich side inlet 9 of each burner 3 for rich combustion of the fuel gas supplied from the rich gas supply passage 15.
Is a rich gas nozzle as a rich gas supply means for individually blowing the gas, and the combustion air introduced from the air chamber 5 is ejected at a predetermined ratio by the ejector action when the fuel gas is blown from the rich gas nozzle 14. It is configured such that it is sucked into the rich side introduction port 9, and thereby, a rich air-fuel mixture is mixed and generated in the course of passing through the thickening mixing chamber 8, and this rich air-fuel mixture is discharged from the thickening upper flame port 7.

On the other hand, the light upper burner 10 of the light combustion burner 6
As for the light air-fuel mixture to be discharged from the air-fuel mixture, the light-gas flow passage 16 for introducing the fuel gas for producing the air-fuel mixture, and the light-air side introduction for introducing the fuel gas and the combustion air into the light-gas flow passage 16 for light are introduced. Ports 17 are formed in each of the rich combustion burners 3 in a state where they are separated from the rich mixing chamber 8 and the rich side inlet 9 and the conducting gas by the lean gas conducting passage 16 is provided laterally. A plurality of ejection ports 18 that are ejected obliquely upward to the light mixing chamber 11 are dispersedly arranged in the longitudinal direction of the light upper flame port 10 and are formed on the side wall portion of each rich combustion burner 3.

Separately from the rich gas nozzle 14, the fuel gas supplied from the light gas supply passage 19 is individually blown into the light side inlets 17 to serve as light gas supply means. A light gas nozzle 20 is provided.

That is, as for the lean air-fuel mixture, the combustion air introduced from the air chamber 5 along with the injection of the fuel gas from the lean gas nozzle 20 into the lean side inlet 17 is leaned at a predetermined ratio by the ejector action. The blown fuel gas and the intake air are sucked into the side introduction port 17 and premixed in the course of the conduction in the fresh gas introduction passage 16, and the combustion air is ventilated from the lower fresh introduction port 12. By causing the above-described generated air-fuel mixture in the light-gas mixing passage 16 to be jetted in a dispersed state from the plurality of jet outlets 18 into the light-air mixing chamber 11, the light-air mixture having a uniform mixed state in the light-air mixing chamber 11. Are mixed and generated, and this light air-fuel mixture is discharged from the light upper flame outlet 10.

Regarding the combustion mode of the rich / lean combustion device,
By burning the rich air-fuel mixture, which enables a stable independent combustion by reducing the primary air ratio, at the above-mentioned thick upper flame port 7, the primary air ratio discharged from the adjacent light upper flame port 10 is large. The light air-fuel mixture is stably and continuously combusted by the flame holding effect of the rich air-fuel mixture combustion flame, whereby the NO
It is intended to reduce the generation of x.

Each of the rich gas supply passage 15 and the light gas supply passage 19 has both gas supply passages 15 and 1.
The individual gas amount adjustment valves V1 and V2 for individually adjusting the fuel gas supply amount of No. 6 are provided, and both gas supply passages 15,
The main gas supply path 21 on the upstream side of the branch point of 19 is provided with a main gas amount adjusting valve V3 for adjusting the total amount of the supplied fuel gas, and the main gas supply amount of the fuel gas supply amount of the rich-lean combustion device is adjusted. The adjustment (in other words, the input adjustment of the entire device) is basically performed by the main gas amount adjusting valve V3, while the combustion in the rich burner 3 and the light burner 6 is favorably performed. Adjusting the fuel gas ratio on the rich burn side and the lean burn side so that it is maintained (ie,
(Adjusting the fuel gas ejection amount ratio between the rich gas nozzle 14 and the light gas nozzle 20) is performed by both gas supply paths 15 and 19.
The individual gas amount adjusting valves V1 and V2 are used.

[Other Embodiments] Next, other embodiments will be listed.

(1) In the above-described embodiment, the light gas passage 16 is formed below the rich mixing chamber 8 in the rich burner 3, but instead of this, as shown in FIG. In addition, the structure may be such that the light gas communication passage 16 is formed between the lower portion 8a and the upper portion 8b of the rich mixing chamber 8.

(2) Further, in the above-described embodiment, the fuel gas and the combustion air are introduced into the rich mixing chamber 8 and the introduction port 9 for introducing the fuel gas and the combustion air, and the light gas communication passage 16. Although the introduction ports 17 for introducing and are formed on the lateral side of the burner 3 for rich combustion, instead of this, as shown in FIG. 5 and FIG. 6 or FIG. 9,
17 is formed on the lower side of the rich combustion burner 3, and correspondingly, the rich gas nozzle 14 as the rich gas supply means and the light gas nozzle 20 as the lean gas supply means are respectively burned with rich combustion. It may be arranged below the burner 3 for combustion, and furthermore, one of the pair of inlets for rich and light and the gas supply means may be disposed on the side of the rich burner 3. On the other hand, a configuration may be adopted in which the other side is disposed below the rich combustion burner 3.

(3) As shown in FIG. 5, in one rich combustion burner 3, the light gas passage 16 may be divided into a plurality of parts, and in the rich combustion burner 3, rich mixing is performed. In order to form the light gas communication passage 16 in a state of being partitioned from the chamber 8, the shapes of the rich mixing chamber 8 and the light gas passage 16 can be changed in various ways.

(4) In the above embodiment, the combustion gas is supplied together with the fuel gas to the light gas passage 16 so that the light gas passage 16 serves as a mixture air passage for premixing. Although the configuration is made to function, instead of this, a configuration may be adopted in which only the fuel gas is supplied to the light gas passage 16 by the light gas supply means 20.

(5) The rich gas supply means 14 and the light gas supply means 20 are not limited to the nozzle configurations as shown in the above-mentioned embodiments, and various modifications can be made. Also, various adjustment types can be adopted for the specific gas amount adjusting structure for adjusting the fuel gas ratio between the rich combustion side and the light combustion side in the rich and light gas supply means 14 and 20.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view enlarged cross-sectional view showing an embodiment.

FIG. 2 is an enlarged sectional view of a front view showing an embodiment.

FIG. 3 is a cutaway perspective view showing an embodiment.

FIG. 4 is a front view enlarged cross-sectional view showing another embodiment.

FIG. 5 is an enlarged front sectional view showing another embodiment.

FIG. 6 is an enlarged cross-sectional view showing a cross section taken along the line Ey and the line Roro in FIG.

FIG. 7 is an enlarged front cross-sectional view showing another embodiment.

FIG. 8 is a side view enlarged cross-sectional view showing a conventional example.

FIG. 9 is an enlarged cross-sectional view from a front view showing a conventional example.

[Explanation of symbols]

 3 Burner for rich combustion 4,5 Air supply means 6 Burner for lean combustion 7 Upper flame mouth for rich 8 Rich mixing chamber 9 Thick inlet for intake 10 Upper upper flame outlet for light 11 Light mixing chamber 12 Light inlet for darkening 14 Thick Gas supply means 16 light gas communication path 18 fresh gas outlet 20 light gas supply means

Front page continuation (72) Inventor Hiroshi Kamiya 1-152 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Harman Co., Ltd.

Claims (2)

[Claims] 1. A rich upper flame outlet (7) for discharging a rich air-fuel mixture.
A rich mixing chamber (8) communicating with the rich upper flame port (7), and a rich introducing port (9) for introducing fuel gas and combustion air into the rich mixing chamber (8). The formed flat burners (3) for rich combustion are arranged side by side at a predetermined interval, and the upper flame outlet (10) for light that discharges a lean air-fuel mixture and the upper flame outlet (10) for light that communicates lightly are used. A burner (6) for light combustion, which comprises a mixing chamber (11) and a light introduction port (12) for introducing combustion air into the light mixing chamber (11), is provided for the rich combustion burner (3). As a constituent member, which is formed between adjacent rich burners (3) for supplying rich gas to the rich introduction port (9), and the rich introduction. A rich / lean combustion apparatus provided with air supply means (4,5) for supplying combustion air to each of the mouth (9) and the light introduction port (12). A lean gas passage (16) for passing a fuel gas for producing a lean mixture is formed in the rich burner (3) so as to be separated from the rich mixing chamber (8), and A plurality of jet outlets (18) for jetting the fuel gas guided by the gas-use gas passage (16) into the light-mixing chamber (11) are distributed in the longitudinal direction of the light-flame upper flame port (10). A lean gas supply means (20) which is formed on the side wall of the rich burner (3) and supplies fuel gas to the lean gas conduit (16) separately from the rich gas supply means (14). ) Is provided in the dark and light combustion device. 2. The fresh gas passage (16) receives fuel gas supply from the fresh gas supply means (20) and combustion air supply from the air supply means (4,5). The rich / lean combustion device according to claim 1, wherein the rich / lean combustion device serves as a mixture passage.