JP3246578B2 - 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. 004 publication. This is achieved by disposing a combustion inner pipe at the center of the combustion pipe, providing a rich gas flame hole on the upper surface of the combustion inner pipe, and installing a rich gas flame above the mixing chamber formed between the combustion pipe and the combustion inner pipe. A flame is provided on the dark side at the center and the light side on both sides. However, in the case where the center is dark and the outside is light, the light outer portion is easy to lift.

[0003] Therefore, the applicant of the present application has previously made the center light side,
There has been proposed a combustion apparatus in which the outside is made to be the deep side, and a rich flame slowed down between the rich and pale flames is formed to stabilize combustion (see Japanese Patent Application No. 4-358480).

[Problems to be solved by the invention]

[0004] However, in the above-described apparatus, the rich flame and the light flame are burned at the same height, and there is a problem that when the turn-down occurs, oscillating combustion occurs. This is because when the turndown occurs, the flame of the auxiliary flame formed by the decompression wall becomes an extremely small flame, so the flame is easily disturbed by the influence of disturbance, and it becomes impossible to suppress the vibration of the light flame It is.

An object of the present invention is to provide a combustion apparatus which stabilizes combustion in which oscillating combustion hardly occurs.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a light emitting device in which a light side flame hole is formed in a central portion and a dark side flame hole is provided on both sides. The upper flame hole surface of the side flame hole structure is made higher than the dense flame hole on both sides, and the light flame hole of the same height as the dense flame hole is formed on both sides and both ends. .

[0007]

When burning, the rich flame is formed on both sides of the light-side flame hole , and the light flame is formed at a position higher than both sides in the center, and burns. Concentrated this time, a light side fire hole structure pale gas <br/> scan ejected from pale side flame holes of both sides are formed in concentrated side fire hole of the same height were ejected from the dark side burner ports When mixed with the gas, it becomes an intermediate concentration to form an intermediate flame between the light flame and the rich flame, and acts on the base of the light flame to stabilize the flame and prevent oscillating combustion. Also, cut off both ends of the light side flame hole structure,
Place the light side flame hole at the same or lower position than the flame hole surface.
By forming, the light flame of both ends gushes outward
No longer burns the inside of the burner case
Therefore, it is possible to prevent the burner case from being damaged by heating.

[0008]

FIG. 1 is a sectional view of a main part of a combustion apparatus showing an embodiment of the present invention, and FIG. 2 is a plan view of a main part.

[0009] In the reference numeral 1, a mixing chamber 2 is formed in the center, and a rich gas chamber 3 is formed on both sides of the mixing chamber 2. It is a combustion tube. Reference numeral 6 denotes a decompression wall provided on the inner side wall of the dense gas chamber 2, provided between the light-side flame hole 4 and the rich-side flame hole 5, and communicates with the dense gas chamber 2 through a through hole 7.
On the upper surface, a dark-side flame extinguishing hole 8 is formed. Reference numeral 9 denotes a light-side flame hole structure provided between the pressure-reducing walls 6 in the upper part of the mixing chamber 2, the upper end of which is higher than the dark-side flame hole 5 and the auxiliary flame hole 8, and the light-side flame hole 4 is formed on the upper surface. A light-side flame hole 10 having the same height as the deep-side flame hole 5 and the supplementary flame hole 8 is formed between both side surfaces and the pressure-reducing wall 6.

With the above configuration, during combustion, a rich gas having a low excess air ratio is supplied to the rich gas chamber 3 to form a rich flame in the rich flame hole 5 on the upper surface, and the inside of the pressure reducing wall 6 through the through hole 7. The concentrated gas that has flowed into the gas is decelerated to form a flame in the flame-supply hole 8 on the upper surface. Further, the rich gas supplied to the mixing chamber 2 is mixed with air taken in from the lower air port to generate a light gas in the mixing chamber 2 and form a light-side flame on the light-side flame hole 4 on the upper surface. Then, light flame is disposed at the center, supplementary flame and rich flame are disposed at both sides, and the flame is burned.

Light gas ejected from the light-side flame holes 10 formed on both sides of the light-side flame structure 9 and the light-side flame holes 10 having the same height as the auxiliary-fire holes 8 is concentrated gas from the auxiliary-flame holes 8. And an intermediate concentration to form an intermediate flame of dark and light and stabilize the flame. Even when the amount of combustion is small, the intermediate flame has a certain amount of combustion, so that it does not become unstable under the influence of disturbance.

[0012] As shown in FIG.
Is higher than the dark side flame hole surface, both ends A in the longitudinal direction also become higher than the case surface of the combustion tube 1, and the light side flame holes 4 at both ends are formed.
From there, there is a problem that gas is blown out laterally or obliquely upward, and the burner case is blown up and lifted to emit unburned gas.

[0013] Therefore, as shown in FIG. 4, notched longitudinal ends A pale side fire hole structure 9, so that the notched surface B lower than the case the same plane or combustion tube 1 When this is set, the fresh gas that has been squirting outward will squirt upward, and the inner surface of the burner case will be blown.
And heat damage can be eliminated.

[0014]

As described above, according to the present invention, the light hole surface of the light side flame hole structure is made higher than the dark side flame hole, and both sides and both ends of the light side flame hole have the same height as the dark side flame hole. Since the side flame holes were formed, a flame of intermediate concentration between the light flame and the rich flame was formed in the light side flame holes on both sides , and the light side flame was heated by heating the base of the light side flame.
Vibration combustion can be prevented by improving the flame hole fixing property of the flame, and the combustion can be stabilized.

Further, since the flame having the above-mentioned intermediate concentration is formed in a part of the light-side flame, a certain amount of combustion can be secured even if the flame is turned down, and the flame is hardly affected by disturbance. Can be widened. Ma
In addition, cut off both ends of the light-side flame hole structure, and
Form a light side flame hole at the same or lower position than
By doing so, the light flame at both ends does not squirt outward
The inside of the burner case
The heat damage of the corner case can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a main part of the same example.

FIG. 3 is a perspective view of relevant parts showing both ends of the example.

FIG. 4 is a perspective view of an essential part showing an embodiment in which both ends of the light side flame hole structure of the same example are cut off.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion pipe 4 Light side flame hole 5 Rich side flame hole 8 Supplementary flame hole 9 Light side flame hole constituent 10 Light side flame hole

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-306805 (JP, A) JP-A-5-231621 (JP, A) JP-A-4-186004 (JP, A) JP-A-2- 33509 (JP, A) JP-A-7-42913 (JP, A) JP-A-6-84117 (JP, A) JP-A-6-82011 (JP, A) JP-A-6-82010 (JP, A) JP-A-5-306806 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/02-14/10 F23C 11/00 329-330

Claims (1)

(57) [Claims] 1. A light-side flame hole having a light-side flame hole in the center and a dark-side flame hole on both sides. A combustion apparatus characterized in that it is higher than a flame hole and light side flame holes having the same height as the dense side flame hole are formed on both sides and both ends thereof.