JPH0742914A - Combustion device - Google Patents

Abstract

PURPOSE:To produce two kinds of rich flame and lean flame alternatively, improve a flame holding characteristic and stabilize a combustion of each of these flames by a method wherein a combustion pipe is divided by a central separation wall into both a rich gas passage and a lean gas passage, both flame ports are formed into corrugation and then both rich flame port and lean flame port are alternatively formed. CONSTITUTION:A combustion pipe 11 is comprised of a pair of right and left outer walls forming a throat part and a flame port, and of a central separating wall 12. A passage is divided by the separating wall 12 into a right one and a left one, i.e., a rich gas passage 13 and a lean gas passage 14, respectively. Flame ports 15 at the separating wall 12 are formed into corrugations. In addition, rich gas flame ports 16 and the lean gas ports 17 are alternatively formed. With such an arrangement as above, two kinds of rich and lean gas flames are alternatively formed to improve a flame holding characteristic. In turn, a pressure reducing wall 21 is arranged at an outside part of the flame port of the combustion pipe 1 through a flame holding gap 20, and a through-pass hole 22 for use in supplying rich gas from a rich gas passage 13 into the pressure reducing wall 21 is formed at a lower part of the rich flame ports 16. With such an arrangement as above, the rich gas flame is generated above the flame holding gap 20 so as to further improve the flame holding characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus of a rich and lean combustion type.

[0002]

2. Description of the Related Art Conventionally, there is a rich / lean combustion system as one of combustion systems designed to reduce NOx, and a burner realized by a combustion tube system of a metal plate has disclosed, for example, Japanese Patent Laid-Open No. 2-30.
It was a dual-structure combustion tube like the one described in Japanese Patent No. 6005. That is, the flame port is composed of an inner flame port and an outer flame port around the flame port.The venturi throat is connected with an expansion tube, which is a Venturi tube. The expansion tube is inserted, the inner expansion tube is connected to the inner flame port, and the mixed gas with a high gas concentration is supplied. The passage with the expansion tube is connected to the outer flame port to supply the lean mixed gas. .

[0003]

However, such a double tube type has the problems that the structure is very complicated, the assembling property is poor, and the manufacturing cost is high.

An object of the present invention is to provide a combustion device having a simple structure and more stable combustion.

[0005]

In order to achieve the above-mentioned object, the combustion apparatus of the present invention separates the combustion pipe into a left side gas passage and a right side gas passage by a separation wall provided in the center, and separates them. The flame mouth portion of the wall is formed in a wavy shape, and the dark side flame mouth and the light side flame mouth are alternately formed.

Further, a pressure reducing wall may be provided outside the flame opening of the combustion tube with a flame holding gap, and a through hole may be provided for supplying a rich gas from the rich gas passage to the flame holding gap.

[0007]

[Operation] The combustion tube is divided into a left side gas passage and a right side gas passage by a separating wall, and the flame side is corrugated to form the dark side flame port and the light side flame port alternately to form the rich side flame. And the light side flame are formed alternately, the structure of the combustion pipe is simple, the interval between the dense side flame port and the light side flame port can be narrowed, and the dark and light flames can be alternately formed at appropriate intervals. Improves the holdability and stabilizes combustion.

Further, a rich gas is supplied from the through hole to the flame holding gap formed by providing the pressure reducing wall to form a flame above the gap. This flame with a high gas concentration and a slow flow velocity is formed so as to surround the flame at the flame mouth from the left and right, and as a result, the light flame at the flame mouth is rich in the flame at the flame mouth and the flame at the flame holding gap. It will be surrounded by side flames,
The flame holding property is further improved.

[0009]

1 is a perspective view showing an embodiment of the present invention, FIG.
Is a plan view of the flame hole surface, and FIG. 3 is an exploded perspective view.

Reference numeral 11 denotes a combustion pipe, which is a pair of left and right outer wall portions having a throat portion and a flame port portion and a separating wall 12 provided at the center.
And the separation wall 12 allows the rich gas passage 1 to be formed.
3 and the light gas passage 14 are divided into left and right passages,
The flame opening 15 of the separation wall 12 is formed in a corrugated shape, and the dark side flame opening 16 is formed.
And light side flame ports 17 are formed alternately. 1
8 is the inlet of the dense gas passage 3, 19 is the inlet of the light gas passage 4, and nozzles (not shown) are faced to the inlets 18 and 19, respectively, and the gas concentrations of the passages 13 and 14 are arbitrarily set. Set.

With the above structure, the combustion tube 11 is divided into a left side and a right side by the separation wall 12 provided in the center.
The burner portion 15 is formed in a corrugated shape to form a darker burner tip 16 and a lighter burner tip 1.
7 and 7 are alternately formed, and the rich side gas passage 13 leads to the rich side flame port 1
The rich gas supplied to 6 forms a rich flame, and the light gas supplied from the light gas passage 14 to the light flame port 17 forms a light flame. Therefore, the structure of the combustion pipe 11 is simpler than that of the double pipe type, and the rich side flame port 16
And the light side flame port 17 are narrow, and two kinds of flames of different shades are formed alternately, so that the flame holding property is improved and the combustion is further stabilized.

Although the wave-side pattern of the flame opening 15 is square in this embodiment, it may be round, and the dark-side and light-side areas are not the same. You may make the dark side flame mouth area small.

Further, although the flame port portion 15 of the separating wall 12 is formed in a corrugated shape so that dense and rich flames are alternately formed, in this case, there is no rich flame on the left and right outer sides of the lean flame, In order to improve the problem that the flame holding property of this part is low,
As shown in other embodiments of Nos. 5 and 6, a pressure reducing wall 21 is provided outside the flame opening of the combustion tube 11 with a flame holding gap 20 and pressure is reduced from the rich gas passage 13 below the rich flame opening 16. If the through holes 22 are provided so as to supply the rich gas into the wall 21 and the dense flame is formed on the flame holding gap 20, the flow velocity around the rich / lean flame of the flame mouth portion 15 having a fast flow velocity can be improved. A slow dark flame is formed, and the flame holding property can be further improved.

[0014]

As described above, according to the present invention, the combustion pipe is divided into the left and right gas passages on the left and right sides by the central separating wall, and the flame port is formed in a corrugated shape to form the thick and light sides. Since the flame openings are formed alternately, the structure is simple and the assemblability is good, and the manufacturing cost is advantageous, and two types of flames of different shades are formed alternately, improving the holdability of the flame and stabilizing the combustion and NOx.
Occurrence of can be further reduced.

Further, if the pressure reducing wall is provided, a thick flame having a slow flow velocity is formed around the flame opening portion, so that the flame holding property can be further improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view of a flame hole surface of the same example.

FIG. 3 is an exploded perspective view of the same example.

FIG. 4 is a perspective view showing another embodiment.

FIG. 5 is a plan view of a flame hole surface of the same example.

FIG. 6 is an exploded perspective view of the same example.

[Explanation of symbols]

 11 Combustion Pipe 12 Separation Wall 13 Thick Side Gas Passage 14 Light Side Gas Passage 15 Flame Portion 16 Thick Side Flame Tip 17 Light Side Flame Tip 20 Flame Retaining Gap 21 Pressure Reduction Wall 22 Through Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Matsuda Noritsu Co., Ltd. 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture (72) Masaaki Hisamon In-house No. 32 Akashi-cho, Chuo-ku, Kobe, Hyogo Prefecture

Claims (2)

[Claims] 1. A combustion wall is divided into a left side gas passage and a right side gas passage by a separation wall provided in the center, and a flame port portion of the separation wall is formed in a corrugated shape. A combustion device characterized in that flame openings are formed alternately. 2. The combustion device according to claim 1, wherein a pressure reducing wall is provided outside the flame port of the combustion tube with a flame holding gap, and a through hole for supplying a rich gas from the rich gas passage is provided.