JP3132265B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lean-burn combustion apparatus for stabilizing combustion.

[0002]

2. Description of the Related Art Conventionally, as one of combustion systems for reducing NOx, there is a lean-burn combustion system.
No. 501 is disclosed. In this method, a first burner tube for supplying a lean air-fuel mixture and a second burner tube for supplying a rich air-fuel mixture are alternately arranged side by side. A dark flame is formed in the portion, and the light flame is retained by the dark flame to stabilize combustion.

[0003]

However, in such a lean-burn combustion, the vicinity of the boundary between the lean flame and the rich flame is high in stability, but in the center of the lean flame, the flame is lifted without being stabilized. Or cause oscillating combustion. In order to improve the stability of the light burner, the flame is divided appropriately according to the flame hole pattern, and even if it is attempted to hold the flame with a small flame, the flame holding effect is small because the small flame itself has a low gas concentration, and there is room for improvement. is there.

[0004] It is an object of the present invention to improve the stability of a light burner and to provide a combustion device having a wide stable combustion region.

[0005]

According to the present invention, in order to achieve the above object, a burner for light flame and a burner for rich flame are alternately arranged, and a burner for rich flame is provided with a light mixture gas. In the configuration in which a rich mixture is supplied to the burner for light flame, a cutout for dense gas is provided in the flame hole structure, and the cutout for rich gas and the adjacent burner for rich flame are communicated, A deep flame is formed between the light flames.

[0006]

During combustion, a light mixture is supplied to the burner for light flame to form a light flame on the flame hole structure, and the mixture is supplied to the burner for rich flame to form a light flame on the structure. Forms a deep flame. The burner component for the light flame burner is provided with a notched portion for rich gas so as to divide the light flame hole, and the dense gas flows in from the burner for rich flame adjacent to the notched portion for rich gas. Then, a rich flame is formed on the rich gas notch. Therefore,
A deep flame will be formed between the light flames of the burner for light flame,
Suppresses light flame lift and oscillating combustion to stabilize combustion.

[0007]

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention.
FIG. 2 is a side view showing two types of perforated plates, FIG. 3 is a side view of a main part showing a state where two types of perforated plates are superposed, FIG. 4 is a perspective view showing a burner arrangement, and FIG. FIG.

Reference numeral 1 denotes a case, in which burners 2 for light flame and burners for rich flame are alternately arranged so that both ends become burners 3 for rich flame. The burner 3 for light mixture and rich flame in which the ratio exceeds 1 is provided with a supply means for supplying a rich mixture having an excess air ratio of 1 or less. This supply means defines a light mixture chamber 5 at the center and a rich mixture chamber 6 at both ends by a partition plate 4 inside the case 1, and the burner 2 for light flame is provided at a portion facing the light mixture chamber 5. An opening 7 is provided to introduce a lean mixture, and the burner 3 for rich flame is provided with an opening 8 at a portion facing the rich mixture chamber 6 to introduce a rich mixture. The gas from the fan 9 and the air from the fan 10 are mixed to generate and supply a lean mixture or a rich mixture in the respective mixture chambers 5 and 6. Reference numeral 11 denotes a flame hole structure of the burner 2 for light flame or the burner 3 for rich flame.
Flame holes A and B made of two types of metal plates having notches and having different shapes are alternately overlapped with each other, and are inserted into the burners 2 and 3 to form flame holes. Burner for light flame 2
In the flame hole constituting body 11, the dense gas introduction hole 12 is provided in the flame hole plate A,
A notched portion 13 for dense gas is provided in the flame hole plate B, and a concentrated gas introduction hole 14 provided on the side surface of the burner 2 for light flame and a concentrated gas introduction hole provided at the same position on the side surface of the burner 3 for rich flame ( (Not shown) to communicate with the burner for rich flame 3 to introduce a rich gas.

The present invention is constructed 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 burner 2 for light flame,
The divided light flames are stabilized by the rich flames, respectively, and suppress the lift and the oscillating combustion of the light flame to stabilize the combustion.

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

As shown in FIGS. 9 to 11, when the notch 18 of the perforated plate B is formed into a shape that does not allow a light gas to flow in place of the groove plate 17, the notch 19 of the perforated plate A is overlapped. As a result, it is possible to form the notched portion for concentrated gas, and it is advantageous that no new parts are required only by changing the shape of the flame hole plate B.

[0012]

As described above, according to the present invention, a notched portion for dense gas is provided in the flame hole structure of the burner for light flame to form a rich flame between the light flames. The rich flame enhances the hold property of the flame, and the lift and vibration combustion of the light flame can be suppressed. Moreover, the burner for light flame is
Since the concentrated gas is introduced from the adjacent rich flame burner, the structure is not so complicated, and it can be manufactured simply and inexpensively.

[Brief description of the drawings]

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

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

FIG. 3 is a main part side view showing a state in which two types of flame hole plates are superimposed.

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

FIG. 5 is a cross-sectional view showing the entire configuration.

FIG. 6 is a perspective view of an essential part showing another embodiment of a notched portion for concentrated gas of a flame hole structure.

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

FIG. 8 is a main part side view showing a state in which two types of flame hole plates of the same example are superimposed.

FIG. 9 is a perspective view showing another embodiment of the notched portion for concentrated gas of the flame hole structure.

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

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

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Ueda Examiner, Katsuyuki Higashi, Noritsu, 32nd Akashi-cho, Chuo-ku, Kobe-shi, Hyogo (56) Reference JP-A-5-223219 JP-A-5-231619 (JP, A) JP-A-3-263501 (JP, A) JP-A-6-193832 (JP, A) JP-A-6-147439 (JP, A) (58) Int.Cl. ⁷ , DB name) F23D 14/02 F23D 14/08 F23D 14/74 F23C 11/00 329-330

Claims (1)

(57) [Claims] A burner for light flame and a burner for rich flame are alternately arranged so that a light mixture is supplied to the burner for light flame and a rich mixture is supplied to the burner for rich flame. A notched portion for dense gas is provided in the flame hole structure of the burner for flame, and the notched portion for dense gas and the adjacent burner for rich flame are connected to form a rich flame between light flames. And combustion equipment.