JPH07103420A - Combustion device - Google Patents

Abstract

PURPOSE:To enable a stable combustion to be attained by a method wherein a flame hole structure of a thin flame burner is provided with thick gas recesses, the recesses are communicated with an adjoining thick flame burner then e thick flame is formed between the thin flames. CONSTITUTION:A thin flame is formed above a flame hole structure with thin mixture gas supplied to a thin flame burner 2 during combustion and thick flame is formed on a flame hole structure 11 with the thick mixture gas supplied to a thick flame burner 3. The flame hole structure 11 of the thin flame burner 2 is provided with thick gas recesses 13 so as to divide the thin flame holes and form them. Thick gas is flowed from the thick flame burner 3 near the thick gas recesses 13 so as to form the thick flame on the thick gas recesses 13. With such an arrangement as above, the thick flame is formed between the thin flames of the thin flame burner 2, resulting in that it is possible to restrict the lifting of the thin flame, the vibratory combustion and to make a stable combustion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rich / lean combustion type combustion device in which combustion is stabilized.

[0002]

2. Description of the Related Art Conventionally, there is a rich and lean combustion system as one of combustion systems designed to reduce NOx, for example, JP-A-3-263.
There is one described in Japanese Patent Publication No. 501. In this, the first burner tube for supplying the light air-fuel mixture and the second burner tube for supplying the rich air-fuel mixture are alternately arranged adjacent to each other, and the light flame and its neighbor are placed on the flame hole plate provided on the upper side. A dense flame is formed in the part, and the light flame is held by the rich flame to stabilize the combustion.

[0003]

However, in such rich-lean combustion, the stability is high in the vicinity of the boundary between the lean flame and the rich flame, but the flame is not stable and lifts in the center of the lean flame. Or cause oscillatory combustion. In order to improve the stability of the light burner, even if flames are appropriately divided and formed according to the flame hole pattern and the flame is held by a small flame, the small flame itself has a low gas concentration, so the flame holding effect is small and there is room for improvement. is there.

It is an object of the present invention to provide a combustion device which improves the stability of a light burner and has a wide stable combustion region.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention alternately arranges a burner for lean flame and a burner for rich flame, and a lean mixture is supplied to the burner for lean flame and a burner for rich flame. In the one in which a rich mixture is supplied to the burner for lean flame, a notch for rich gas is provided in the flame hole structure, and the notch for rich gas and an adjacent burner for rich flame are communicated with each other, It is designed to form a thick flame between light flames.

[0006]

[Function] During combustion, the light air-fuel mixture supplied to the light flame burner forms a light flame on the flame hole structure, and the light air mixture supplied to the rich flame burner causes the light air mixture to be formed on the flame hole structure. Form a rich flame. The burner structure of the lean flame burner is provided with a notch for rich gas so as to divide and form the lean flame, and rich gas flows from the burner for rich flame adjacent to the notch for rich gas. Then, a rich flame is formed on the notch for rich gas. Therefore,
A rich flame will be formed between the light flames of the light flame burner,
It suppresses light flame lift and vibration combustion, and stabilizes combustion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention,
FIG. 2 is a side view showing two kinds of flame hole plates, FIG. 3 is a side view of a main part showing a state where two kinds of flame hole plates are overlapped, FIG. 4 is a perspective view showing a burner arrangement, and FIG. FIG.

Reference numeral 1 designates a case in which a lean flame burner 2 and a rich flame burner are alternately arranged so that both ends become a rich flame burner 3, and the lean flame burner 2 has an excess air ratio. The burner 3 for lean air-fuel mixture and rich flame over 1 has a supply means for supplying a rich air-fuel mixture having an excess air ratio of 1 or less. In this supply means, the case 1 is divided into a partition plate 4 to form a light air-fuel mixture chamber 5 in the center and a rich air-fuel mixture chamber 6 at both ends, and the light flame burner 2 is provided in a portion facing the light air-fuel mixture chamber 5. An opening 7 is provided to introduce a light air-fuel mixture, and the rich flame burner 3 is provided with an opening 8 at a portion facing the rich air-fuel mixture chamber 6 to introduce the rich air-fuel mixture. The gas from 9 and the air from the fan 10 are mixed to generate and supply a light air-fuel mixture or a rich air-fuel mixture in the respective air-fuel mixture chambers 5 and 6. Reference numeral 11 denotes a flame hole structure of the light flame burner 2 or the rich flame burner 3.
Flame hole plates A and B made of two kinds of metal plates having notches and different shapes are alternately laminated, and are inserted into burners 2 and 3 to form flame holes. Light flame burner 2
The flame hole forming body 11 includes a flame hole plate A, a rich gas introduction hole 12,
The flame hole plate B is provided with a notch portion 13 for rich gas, and the rich gas introduction hole 14 provided on the side surface of the burner 2 for light flame and the rich gas introduction hole provided at the same position on the side surface of the burner 3 for rich flame ( (Not shown) communicates with the rich flame burner 3 to introduce a rich gas.

The present invention is configured as described above, and the rich gas is introduced from the rich flame burner 3 into the rich gas notch 13 of the lean flame burner 2 to form a rich flame between the lean flames. Therefore,
Both light and dark flames are formed in one light flame burner 2,
The divided light flames are stabilized by the rich flames respectively, and suppress the lift and oscillatory combustion of the light flames to stabilize the combustion.

In place of the rich gas introduction hole 12 of the flame hole plate A and the rich gas notch 13 of the flame hole plate B of the above embodiment, FIG.
As shown in FIGS. 8 to 8, U-shaped notches 15 and 16 that cross the flame hole plates A and B are provided, and a groove plate 17 is fitted into the U-shaped notches 15 and 16 to form a notch portion for rich gas. A rich gas may be introduced by communicating with the flame burner 3 to form a rich flame.

Further, as shown in FIGS. 9 to 11, if the notch 18 of the flame hole plate B is made to have a shape in which the light gas does not flow instead of the groove plate 17, it is superposed with the notch 19 of the flame hole plate A. Thereby, the notch for the rich gas can be formed, and it is advantageous only by changing the shape of the flame hole plate B that a new component is not required.

[0012]

As described above, according to the present invention, since the rich gas notch portion is provided in the flame hole structure of the light flame burner and the rich flame is formed between the light flames, the light flames that are divided and formed are divided. Each rich flame enhances the holding property with respect to the flame, and lift of the lean flame and oscillatory combustion can be suppressed. Moreover, the burner for light flame is
Since the rich gas is introduced from the adjacent rich flame burner, the structure is not so complicated, and the simple and inexpensive manufacturing is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a combustion apparatus showing an embodiment of the present invention.

FIG. 2 is a side view showing two types of flame hole plates.

FIG. 3 is a side view of an essential part showing a state in which two types of flame hole plates are overlapped.

FIG. 4 is a perspective view showing a burner array.

FIG. 5 is a sectional view showing the overall configuration.

FIG. 6 is a main part perspective view showing another embodiment of the rich gas notch of the flame hole structure.

FIG. 7 is a side view of an essential part showing two types of flame hole plates of the same example.

FIG. 8 is a side view of an essential part showing a state in which two types of flame hole plates of the same example are overlapped with each other.

FIG. 9 is a perspective view showing another embodiment of the rich gas notch portion of the flame hole structure.

FIG. 10 is a side view of an essential part showing two types of flame hole plates of the same example.

FIG. 11 is a side view of an essential part showing a state in which two types of flame hole plates of the same example are overlapped.

[Explanation of symbols]

 2 Burner for light flame 3 Burner for rich flame 11 Flame hole structure 13 Notch for rich gas

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hidehisa Hashimoto, Inventor, No. 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo (72) Inventor, Hideo Ueda, No. 32, Akashi-cho, Chuo-ku, Kobe, Hyogo

Claims (1)

[Claims] 1. A light flame burner and a rich flame burner are alternately arranged so that a lean air-fuel mixture is supplied to the lean flame burner and a rich air mixture is supplied to the rich flame burner. A rich gas notch is provided in the flame hole structure of the flame burner, and the rich gas notch and the adjacent burner for rich flame are connected to form a rich flame between the light flames. And a combustion device.