JPH0510513A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To improve the holding effect of main flames in a thick and thin fuel combustion type combustion apparatus, and to reduce the loads on burner ports and combustion noise. CONSTITUTION:A thin fuel-air mixed gas passage 2 is separated from a thick fuel-air mixed gas passage 3 by a partition wall 4. A contact edge 5 of the partition wall 4 with a burner port plate 1 is formed into a blade-like shape. Thereby, main and auxiliary flames formed on the burner port plate 1 are not separated from each other and the holding effect of main flames is improved, resulting in stabilization of main flames. Moreover, as an area on the burner port plate 1 where flames are not formed can be eliminated, the area efficiency is improved and the loads on burner ports and combustion noise are reduced.

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 device.

[0002]

2. Description of the Related Art In a conventional combustion system, in order to achieve low NO _x , a light air-fuel mixture having a large excess air ratio and a rich air-fuel mixture having a small excess air ratio are combusted to make a light air-fuel mixture rich mixture. It is well known that a so-called light and dark combustion method of holding with a flame is effective.

2 and 3 show an example of a conventional combustion apparatus of the dark and light combustion type. This combustion device 11 has a flame hole plate 12 provided with a large number of flame holes, and a main mixing chamber 13 for producing a light air-fuel mixture.
And a sub-mixing chamber 14 for producing a rich air-fuel mixture having a gas concentration higher than that of the main mixing chamber 13 are separated and formed by a partition wall 15 and communicate with the main mixing chamber 13 to guide the light air-fuel mixture to the flame hole plate 12. A partition 18 defines 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 hole plate 12. Reference numeral 19 is a speed reducing means provided in the rich mixture passage 17,
21 is a gas nozzle.

Thus, the light air-fuel mixture produced in the main mixing chamber 13 forms a main flame on the flame hole plate 12, and the rich air mixture produced in the sub-mixing chamber 14 forms on the flame hole plate 12. Dense combustion that holds the main flame by the supplementary flame is performed.

[0005]

This conventional combustion device 1
In 1, the separation passage of the light mixture passage 16 and the rich mixture passage 17 for supplying two kinds of mixture is required,
Although this is separated and formed by the partition wall 18, since the flame is not formed in the flame hole located directly above this partition wall 18, the flame holding force is weakened and combustion noise is increased.
Further, since a dead space is formed on the partition wall 18, there is a problem in terms of effective utilization of the area of the flame hole plate 12.

The present invention has been made in view of the above-mentioned problems, and it is a rich-lean combustion system for reducing NO _x , and the flame plate has 2
By forming an edge-shaped joint between the partition wall and the flame hole plate that separates and supplies different types of air-fuel mixture, a flame is formed on the partition wall, and the area efficiency of the flame hole plate is improved to achieve low noise. The purpose of the present invention is to provide such a combustion device.

[0007]

In order to achieve the above-mentioned object, a combustion apparatus of the present invention is provided with a light air-fuel mixture passage for guiding a light air-fuel mixture to a flame hole plate and a rich air-fuel mixture from around the light air-fuel mixture passage. In the case where the partition wall separates the rich mixture passage leading to the flame hole plate from each other, the contact portion of the partition wall with the flame hole plate is formed in an edge shape.

[0008]

[Operation] During combustion, the light air-fuel mixture supplied from the light air-fuel mixture passage to the flame hole plate forms the main flame, and the heavy air-fuel mixture supplied from the rich air-fuel mixture passage to the flame hole plate forms a supplementary flame. Since the contact portion of the partition wall that separates the light-air mixture passage and the rich-air mixture passage from the flame hole plate is formed into an edge shape, the main flame and the supplementary flame on the flame hole plate do not separate. It can be formed to improve the hold effect of the main flame, improve the area efficiency of the flame hole plate to reduce the flame hole load, and reduce the combustion noise.

[0009]

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 omitted in the drawing. A main mixture chamber and a light mixture passage 2 which communicates with a main mixing chamber (not shown) for producing a light mixture having an excess air ratio of more than 1 and guides the light mixture to a flame plate 1 having a large number of flame holes. The partition wall 4 communicates with a sub-mixing chamber (not shown) that creates a rich air-fuel mixture having a higher gas concentration than that of the rich air-fuel mixture passage 3 that guides the rich air-fuel mixture from the periphery of the light air-fuel mixture passage 2 to the flame hole plate 1. The partition wall 4 is formed separately, and 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 hole plate 1 to which the light air-fuel mixture is supplied from the light air-fuel mixture passage 2, and on the flame hole plate 1 to which the rich air-fuel mixture is supplied from the rich air-fuel mixture passage 3. Inflammation is formed in. Due to this supplementary flame, the main flame is held and burns stably. At this time, since the contact portion 5 of the partition wall 4 in which the light air-fuel mixture passage 2 and the rich air-fuel mixture passage 3 are separately formed with the flame hole plate 1 is formed in an edge shape, it is formed on the flame hole plate 1. The main flame and the supplementary flame can be formed in a connected state without being separated, and the holding effect of the main flame is improved.

Moreover, since the flame can be formed on the flame hole plate on the partition wall where no flame was conventionally formed, the area efficiency can be improved and the load of the flame hole can be reduced. can do.

[0012]

As described above, according to the combustion apparatus of the present invention, since the contact portion of the partition wall which separates and forms the light air-fuel mixture passage and the rich air-fuel mixture passage is formed into an edge shape, Since the main flame and the supplementary flame formed on the flame hole plate are combusted in a connected state without being separated from each other, the hold effect of the supplementary flame on the main flame is improved, and stable combustion is obtained.

Moreover, since the flame is formed on the flame hole plate even in the 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.

As described above, the NO _x can be reduced by the rich / lean combustion, and the noise reduction can be achieved by improving the flame holding effect and reducing the flame hole load.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

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

Claims (1)

Claim: What is claimed is: 1. A partition for dividing a light air-fuel mixture passage that guides the light air-fuel mixture into the flame hole plate and a rich air-fuel mixture passage that guides the rich air-fuel mixture from the periphery of the light air-fuel mixture passage into the flame hole plate. In the case of separate formation, a combustion device characterized in that a contact portion of the partition wall with the flame hole plate is formed in an edge shape.