JP2894014B2 - 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 low noise combustion apparatus.

[0002]

In a conventional combustion method, and a small dense mixture of large pale mixture and the excess air ratio of the excess air ratio in order to achieve low NO _X reduction is burned, rich mixture of pale mixture flame It is well-known that a so-called lean-burn system in which a flame is held is effective.

FIGS. 2 and 3 show an example of a conventional lean-burn combustion apparatus. The combustion apparatus 11 has a flame plate 12 provided with a large number of flame holes, and a main mixing chamber 13 for producing a lean mixture.
And a sub-mixing chamber 14 for forming a rich mixture having a higher gas concentration than the main mixing chamber 13 is formed separately by the partition wall 15, and communicates with the main mixing chamber 13 to guide the light mixture to the flame plate 12. A light-mixture passage 16 and a rich-mixture passage 17 that communicates with the sub-mixing chamber 14 and guides the rich mixture from around the light-mixture passage 16 to the flame plate 12 are formed by partition walls 18. 19 is a speed reducing means provided in the rich mixture passage 17, 20,
21 is a gas nozzle.

[0004] Thus, the lean mixture produced in the main mixing chamber 13 forms a main flame on the flame plate 12, and the rich mixture produced in the sub-mixing chamber 14 forms on the flame plate 12. Light and rich combustion for holding the main flame is performed by the supplementary flame.

[0005]

The conventional combustion device 1
In the case of 1, a separation passage of a light mixture passage 16 and a rich mixture passage 17 for supplying two types of mixture is required,
This is separated and formed by the partition 18. However, since no flame is formed in the flame hole located directly above the partition 18, the flame holding power is weakened and the combustion noise is increased.
Further, since a dead space is formed on the partition wall 18, there is a problem in terms of effective use of the area of the flame hole plate 12.

[0006] The present invention has been made in view of the above problems, in shading combustion system to reduce the NO _X reduction, 2 flame hole plate
By forming the joint of the partition wall with the flame hole plate that separates and supplies different types of air-fuel mixture into an edge shape, a flame is formed on the partition wall, and the area efficiency of the flame hole plate is improved to achieve low noise. It is an object of the present invention to provide an improved combustion device.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a combustion apparatus according to the present invention provides a lean mixture passage for guiding a lean mixture to a flame plate, and a rich mixture for surrounding a lean mixture passage. In a structure in which a rich mixture passage leading to a burner plate is formed separately by a partition, a contact portion of the partition with the burner plate is formed in an edge shape.

[0008]

During combustion, the lean mixture supplied to the flame plate from the lean mixture passage forms a main flame, and the rich mixture supplied to the flame plate from the rich mixture passage forms a supplementary flame. Since the contact portion of the partition wall that separates and forms the light mixture passage and the rich mixture passage with the flame hole plate is formed in an edge shape, the main flame and the supplementary flame on the flame hole plate are not separated. It can be formed to improve the holding effect of the main flame, improve the area efficiency of the flame hole plate, reduce the flame hole load, and reduce the combustion noise.

[0009]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, and the same components as those in FIG. 2 are not shown. A light mixture passage 2 which communicates with a main mixing chamber (not shown) for producing a light mixture in which the excess air ratio exceeds 1 and guides the light mixture to a flame plate 1 having a plurality of flame holes; A rich mixture passage 3 which communicates with a sub-mixing chamber (not shown) for producing a rich mixture having a higher gas concentration and guides the rich mixture from the periphery of the light mixture passage 2 to the flame plate 1 and a partition 4 The contact portion 5 of the partition wall 4 with the flame hole plate 1 is formed in an edge shape.

During combustion, a main flame is formed on the flame-perforated plate 1 supplied with the lean mixture from the lean-mixture passage 2, and on the flame-perforated plate 1 supplied with the rich mixture from the rich-mixture passage 3. A supplementary flame is formed. The main flame is held by this supplementary flame and burns stably. At this time, since the contact portion 5 of the partition wall 4 in which the light mixture passage 2 and the rich mixture passage 3 are separately formed is formed in an edge shape, the partition wall 4 is formed on the flame plate 1. The main flame and the supplementary flame can be formed in a connected state without separation, and the holding effect of the main flame is improved.

In addition, since a flame can be formed on the flame hole plate on the partition wall where the flame has not been formed conventionally, the area efficiency can be improved, the flame hole load can be reduced, and the noise can be reduced in combination with the improvement of the hold effect described above. can do.

[0012]

As described above, according to the combustion apparatus of the present invention, the contact portion of the partition wall for separating and forming the lean mixture passage and the rich mixture passage with the flame hole plate is formed in an edge shape. Since the main flame and the auxiliary flame formed on the flame hole plate are burned in a connected state without separation, the holding effect of the auxiliary flame on the main flame is improved, and stable combustion is obtained.

In addition, since the flame is formed also on the flame hole plate in a portion where the flame is not formed by the conventional partition wall,
The area efficiency of the flame hole plate is improved, and the flame hole load can be reduced.

[0014] can it is possible to lower NO _X by this way thick and thin fuel combustion, to achieve a low noise by reducing the increase and the burner port loading the hold effect of the flame.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional example.

FIG. 3 is an enlarged sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flame hole plate 2 Light mixture passage 3 Rich mixture passage 4 Partition wall 5 Contact part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23D 14/02 F23D 14/14-14/16 F23D 14/62 F23C 11/00 329-330

Claims (1)

(57) [Claims] 1. A method in which a light mixture passage for guiding a light mixture to a flame plate and a rich mixture passage for guiding a rich mixture from the periphery of the light mixture passage to the flame plate are formed separately by partition walls. A combustion device characterized in that an abutting portion of a partition wall with a flame plate is formed in an edge shape.