JPS59157413A - Premixing type combustion device - Google Patents

Abstract

PURPOSE:To enable a stable combustion to be performed with a low noise by a method wherein there are provided a distribution plate having a number of openings which are larger than that of flame openings upstream of a flame opening plate having a number of flame openings and an auxiliary mixing chamber for use in flowing out mixture in a low flow rate. CONSTITUTION:A distribution plate having a number of openings 7 is arranged upstream of a flame opening plate 9, flow of mixture is restricted by the distribution plate 6, a large flame is formed downstream of the openings 7 and a small flame is formed at a flame opening 10 downstream between the openings 7, the large flame is protected by the small flame, mixture of low flow rate is flowed out through an auxiliary mixing chamber 20 at an outer circumference of the flame opening plate 9 to form the small flame and stable flame is formed throughout the entirety.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a premixed fuel W equipped with a flame outlet plate (two-majority Q) and a flame iron.
[Prior art] An all-primary combustor with a ceramic flare plate Z is a radiant stove. It is often used for purposes.

The combustion capacity of this conventional combustor is, for example, 60 x 90
Approximately 1,000 mm for one ceramic flame plate
It burns about kcal/h, and the combustion chamber is small.

If the combustion capacity Z is increased in this combustor, the flame will lift and stable combustion will not be obtained.

Conventionally, in this type of all-primary type combustor, backfire is a possibility, so a backfire prevention mechanism such as a wire mesh or plate having a large number of small diameter openings in the mixture airtight upstream of the flame port plate is provided. [Object of the Invention] The object of the present invention is to provide a combustion system that can provide low-noise and stable combustion even when a large volume of combustion is performed using a descending flame plate with a large number of flame rons (there are two types). SUMMARY OF THE INVENTION The present invention provides a distribution plate having a large number of openings upstream of the flame port plate, regulates the flow of the air-fuel mixture with the distribution plate, and directs a large flame to the flame port downstream of the openings. A small flame is created in the downstream flame port between the opening and the small flame becomes a large flame, and a low-flow mixture is flowed out through the auxiliary mixture heat on the outer periphery of the flame port plate. This is designed to form a small flame and a stable flame as a whole.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on an embodiment shown in FIG.

Reference numeral 1 denotes a burner main body, which forms an internal C mixture chamber 22 and opens to an air population 4 through a mixing passage 3.

Reference numeral 5 denotes a gas nozzle, which is arranged opposite to the mixing passage 3 and fixed to the burner body 1 with screws or the like. , 6 is a distribution plate having a large number of open lower parts, and its periphery 6at is bent and placed on the stepped portion 8 of the air-fuel mixture chamber 2. The bent piece 6a is also provided with an appropriate number of small openings. There are notches 6 between each bent piece 6a.
tl- provided. 9 is a ceramic burner plate having a large number of burner ports 10, and a distribution v51.6+= is placed thereon. 1
Reference numeral 2 denotes a holding plate that holds down the periphery of the flame port plate 9, and is fixed to the flange 13 of the main body 1 with screws 14 or the like. The upper surface C of the flame outlet plate 9 of the presser plate 12 is located in an uneven shape as shown in FIG. C2. , the side of the flame outlet plate 9 (- is placed on the side of the flame outlet plate 9, but not shown).

The distribution plate 6 is a punched metal plate having an open lower part formed in a 0.8 mm thick iron plate by pressing. Open lower diameter is 7
It's about the same level. The opening lowers are arranged in a staggered manner with a pitch of about 3.3 mm as shown in FIG. 3.The height h of the bent pieces 6a is 1.8 mm, and the width l is 5 Inl.

The diameter of booth lower a is 2.2 mm. The total area of the small opening lower a is 3 to 12% of the total area of the auxiliary mixture chamber 20, which is composed of the bent piece 6a, the burner port plate 9, etc. (3 to 12% of the total area of the two communicating burner ports 10)
That's about it.

The flame port plate 9 is made of ceramic whose main component is Z, such as cordierite, and the diameter of the flame port 10 is 1. It is about 0mm. The arrangement of the flame ports 10 is at a pitch of 1.5 as in the arrangement of the openings in Fig. 3.
The flame opening hole 9 has dimensions of 65 mm x 93 mm and a thickness of 12 mm.

The dimensions of each part of this flame port plate 9 are similar to those used for household use.

When combustion is carried out in such a configuration, the flame aperture 10 (2) of the DC flow of the open lower flows out as it is from the open lower, and a large flame a (1) forms. Mouth 1
At 0, the large flames a flow out through the gap 7 between the distribution plate 6 and the upper surface of the flame outlet plate 9, forming small flames. Therefore, the large flames a are arranged in a staggered manner (= arranged, and each large flame aQ) A small fire pit will be formed around P'l. In addition, between the open lowers on the four sides of the open lowers (- indicates that the flame port 10 is located (2), and the small amount of mixture that entered the auxiliary mixture chamber 20 from the small open lower The air is dispersed and flows out from the flame port 10 at a low flow rate, forming a stable small flame Ct shadow.

In other words, a small flame E is formed around the flame outlet plate 90),
A large flame a and a small flame are formed inside the combustor, resulting in stable combustion as a whole, with low noise and low levels of incomplete combustion components such as CO. For example, in the combustor mentioned above. With a combustion meter running at 15,000 days/h, if a 6-ton distribution plate was not installed, lift Z would start when the air ratio N (N = l interval/theoretical air amount) became 1.2 or higher.
If the distribution plate 6 is provided, lifton can be prevented up to N=1.6.

Although there is no special de-temper piece installed between the flame outlet plate 9 and the distribution plate 6, since the distribution plate 6 is made of punched metal, distortion of the flatness of the distribution plate 6 in the open lower case and the flame outlet plate may occur. Due to the flatness and unevenness of the upstream side of the distribution plate 6.
and the upstream surface of the flame port plate 9 (it is considered that a gap is substantially formed through which the air-fuel mixture of the flame a flows). It is conceivable to provide an open lower 7 at the end of the distribution plate 6 without providing the 20 mm, but the flame at the outer periphery of the flame outlet plate 9 will become unstable.
This causes problems such as increased combustion noise and the emission of incompletely combusted CO and other substances.6゜In addition,
The small flame inside is heated by the surrounding large flame a, so it is stable.

Auxiliary mixture chamber 20? It is desirable that the flame outlet plate 9 and the distribution plate 6 on the inner side are in contact with each other, but a substantially C-bistable small flame is formed on the outer periphery of the flame outlet plate 9. This is not the case if it is done.

- According to the experimental result C2, at the flame outlet 1 (IN''-),
The diameter of the open lowers was preferably 4 to 10 mm, and the distance e between the open lowers was preferably 2.5 to 7 mm.

The area around the distribution plate 60) is bent and has some elasticity (2).
9 damage can be prevented.

Also, the contact 7 between the central part of the flame outlet plate 9θ) and the central part of the distribution plate 6
In order to improve the distribution, it is better to divide the distribution pattern into two slightly convex C parts in advance.

6 distribution plates are bent to provide 20 auxiliary mixture chambers, but 1
For example, an auxiliary mixture chamber may be provided by protruding inward from the burner body 1, and a small opening may be provided in this protrusion.In the above example, upper combustion is performed, but downward combustion is performed. But it's the same.

〔Effect of the invention〕

As described above (θ), the present invention provides a distributor having a large number of openings Z larger than the diameter of the flame openings upstream of the flame opening plate having a large number of flame openings (2. Since the auxiliary mixture chamber Z is provided to allow the C2 mixture to flow out at a low flow rate, it is possible to achieve seven good C combustions with low noise using a simple operation.

[Brief explanation of the drawing]

1 is a longitudinal sectional view of a premixing combustor according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a plan view of the distribution plate of FIG. 1. l...Burner body 2...Mixture chamber 3...
Mixture passage 4... Air inlet 5... Gas nozzle 6... Distribution plate 6a... Bent piece
7...Open Lower a...Small opening 9...
・Flame port plate 10...Flame port Zt21 f3 diagram

Claims (1)

[Claims] 1. Small flame nozzle Z Consisting of a large number of flame nozzle plates arranged at small intervals, and a large number of distribution plates T arranged at predetermined intervals with openings larger than the diameter of the flame nozzle, the air-fuel mixture chamber and the burner mouth are handled as Between Ai
i. The distribution plate is disposed close to a burner port plate, and the aperture of the distribution plate is located downstream of the aperture in the outflow direction of the air-fuel mixture. 0) Divide into two so that the other flame port is located at downstream C of FIrJ, and provide an auxiliary mixture air at the upstream of the flame port at the end of the flame port Q) 2. In claim 1, the outer circumference Z of the distribution plate upstream of the outflow direction of the air-fuel mixture ≦ the portion bent twice = the small opening is provided and the bent portion (-Therefore, the premix combustor is characterized in that the auxiliary air-fuel mixture is configured.