JPH07103421A - Combustion device - Google Patents

Abstract

PURPOSE:To make a stable combustion by a method wherein both side surfaces of a thin flame burner and a thick flame burner are provided with through-pass holes and flame holes of both burners are communicated to each other through the through- pass holes. CONSTITUTION:A part of thin mixture gas of a thin flame burner 2 is flowed into a flame hole of a thick flame burner 3 having a low inner pressure through a through- pass hole 5 due to a pressure difference between a thick burner and a thin burner during combustion, injected out while being mixed with a part of the thick mixture gas at the thick flame burner 3, and flame is formed. That is, the mixture gas of intermediate concentration of the thick flame is partially injected from the flame hole surface of the thick flame burner 2, resulting in that a lack of air occurs due to an external disturbance such as applying of inverse pressure to the discharged gas and in the case that a gas concentration of the thick mixture gas becomes a high concentration where a stable combustion may not be carried out, the mixture gas with the intermediate concentration shows a well-suitable concentration, the flame is stabled and then a lifting of the thick flame is prevented under the flame holding action. With such an arrangement as above, it is possible to perform 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, first burner tubes for supplying a light air-fuel mixture and second burner tubes for supplying a rich air-fuel mixture are alternately arranged in parallel, and a light flame and a rich flame are provided on a flame hole plate provided at the upper part. Is formed, and the light flame is held by the dark flame to stabilize the combustion.

[0003]

However, in such rich and lean combustion, the lean flame and the rich flame are completely separated, so that, for example, when a back pressure is applied to the exhaust gas, an air shortage occurs, and the rich flame is rich. If the gas concentration in (1) was too high, the rich flame lifted and combustion was incomplete.

An object of the present invention is to provide a combustion device which prevents lift of rich flame and stabilizes combustion.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention arranges a light flame burner and a rich flame burner alternately so that both ends thereof become a rich flame burner, and each burner is arranged. In which a light air mixture or a rich air mixture is supplied to the both sides of the light flame burner and the rich flame burner, and the flame hole portions of both burners are communicated with each other through the through holes. It is a thing.

[0006]

[Operation] During combustion, due to the difference in burner internal pressure between the lean flame burner and the rich flame burner, a portion of the lean air-fuel mixture of the lean flame burner has a low internal pressure burner flame that is adjacent through the through hole. It flows into the holes, mixes with a part of the rich mixture of the rich flame burner, becomes a mixture having an intermediate concentration of the rich flame, and jets and burns.
In this way, the air-fuel mixture with an intermediate concentration is ejected from a part of the flame hole surface of the burner for rich flame, so the supply air amount is insufficient for some reason, and the rich air-fuel mixture of the rich flame burner becomes a high concentration that cannot be stably burned. At this time, the air-fuel mixture having the intermediate concentration has a proper concentration to form a stable flame, and the flame holding action of this flame prevents the lift of the rich flame.

[0007]

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 kinds of flame hole plates, and FIG. 3 is a stack of two kinds of flame hole plates. Side view showing the state, FIG.
FIG. 4 is a perspective view showing a burner arrangement.

Reference numeral 1 denotes a case in which light burners 2 for rich flame and burners 3 for rich flame are alternately arranged inside so that both ends are burner 3 for rich flame. The burner 3 for air and rich flame is provided with a supply means for supplying a rich air-fuel mixture. Reference numeral 4 denotes a flame hole structure of the light flame burner 2 or the rich flame burner 3, which is formed by alternately stacking flame hole plates A and B made of two kinds of metal plates having notches. 3 to form flame holes. Reference numeral 5 is a through hole provided on both side surfaces of the burners 2 and 3. The hole position is the same as the hole position of the adjacent burner, slightly below the flame hole surface, and preferably slightly below the lower end of the flame hole constituting body 4. A hole is provided above.

Since the present invention is constructed as described above and there is a difference in the internal pressure of the burner between the rich side and the light side during combustion, a part of the lean mixture of the lean flame burner 2 passes through the through hole 5. And flows into the flame hole portion of the rich flame burner 3 having a low internal pressure, and forms a jet flame while mixing with a part of the rich mixture of the rich flame burner 3. That is, a mixture gas having an intermediate concentration of light and dark is partially ejected from the flame hole surface of the burner 3 for rich flame, and an air shortage occurs due to a disturbance such as a back pressure applied to the exhaust gas, resulting in a rich mixture gas. When the gas concentration of the above becomes high enough to prevent stable combustion, the mixture with the intermediate concentration becomes the right concentration and the flame becomes stable, and the flame holding action of this flame causes the lift of the rich flame. To prevent.

[0010]

As described above, according to the present invention, since the through holes are provided on both side surfaces of both the dark and light burners, the air-fuel mixture in the intermediate region between the dark side and the light side can be formed, and the lift of the rich flame due to the decrease in the air amount can be achieved. Can be prevented and combustion can be stabilized.

[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 showing a state in which two types of flame hole plates are overlapped.

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

[Explanation of symbols]

 2 Burner for light flame 3 Burner for rich flame 7 Through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Tonai, 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Noritsu Co., Ltd. (72) Inventor Masamitsu Ishikaku 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Stock In the company Noritsu (72) Inventor Itsuo Nagai 32 No. Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture

Claims (1)

[Claims] 1. A structure in which a lean flame burner and a rich flame burner are alternately arranged so that both ends thereof become a rich flame burner, and a light air mixture or a rich air mixture is supplied to each burner. A combustion device, wherein through holes are provided on both sides of the light flame burner and the rich flame burner, and the flame hole portions of both burners are communicated with each other through the through holes.