JPH07151318A - Combustion device - Google Patents

Abstract

PURPOSE:To enable thick and thin fuel combustion to be simply effected utilizing a general Bunsen type combustion device by a method wherein a guide section, provided below a thick gas chamber, is arranged so as to have a gap between the upper surface of a combustion tube so that gas from the injection port of a combustion tube is distributed into a thick gas chamber and a mixing chamber. CONSTITUTION:A thick and thin flame part constituting body 5, formed at the upper part of a Bunsen type combustion device, is defined and formed so that a mixing chamber 7 is positioned above an air passage 4 and a thick gas chamber 6 is positioned above a combustion tube1. A thick side flame port 8 is provided at the upper part of the thick gas chamber 6, a thin side flame port 10 is provided at the upper part of a mixing chamber 7 through a thin side flame port forming body 9 and a guide unit 11, distributing and guiding gas from the injection port 2 of the combustion tube 1 into the thick gas chamber 6 and a mixing chamber 7, is provided at the lower part of the mixing chamber. The guide unit 11 of the thick and thin flame port constituting body 5 is arranged so as to keep the gap 12 of about 1mm between the guide unit 11 and the flame port surface of a combustion tube. According to this method, thick and thin fuel combustion, can be effected simply.

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 and lean combustion system as one of combustion systems designed to reduce NOx, and various structures have been proposed. For example, there is one using a flame hole plate such as a ceramic disclosed in Japanese Patent Publication No. 57-12923, but it is expensive in manufacturing. There is a metal plate combustion tube system disclosed in, for example, Japanese Patent Application Laid-Open No. 2-306005, but this is a double structure type combustion tube and its structure is complicated. Also, for example, Japanese Patent Laid-Open No. 3-2
As described in Japanese Patent No. 63501, there are some ones in which the light side first burners and the dark side second burners are alternately arranged, but the structure is simplified but the following problems occur. .

[0003]

That is, a structure in which a large number of combustion tubes are closely arranged side by side and the combustion tubes on the dark side and the combustion side on the light side are alternately adjacent to each other is simple in the combustion tube structure, but they are closely arranged. In this case, the accuracy of the burner case (positioning of the combustion tube) is required, and if forced air supply occurs due to the inability to make close contact, air may flow between the burners. Is greatly reduced.

The present invention uses a general Bunsen type combustion apparatus in which combustion tubes are arranged in parallel with each other with a gap serving as a secondary air passage, so that the rich and lean combustion can be easily performed. The purpose is to provide a device.

[0005]

In order to achieve the above object, the present invention provides a Bunsen type combustion apparatus in which a plurality of combustion pipes having ejection holes in the upper part thereof are arranged side by side in the presence of an air passage.
In the upper part, a compartment is formed so that the rich gas chamber is located above the combustion pipe and the mixing chamber is located above the air passage.The dense side flame hole is provided at the upper part of the rich gas chamber and the light side flame hole is provided at the upper part of the mixing chamber. A dense and rich flame hole structure is formed by providing a guide section in the lower part of the gas chamber, and the guide section is provided on the upper surface of the combustion tube so that the gas from the ejection hole of the combustion tube is divided into the rich gas chamber and the mixing chamber. It is arranged with a gap.

[0006]

[Operation] During combustion, the gas ejected from the ejection holes of the combustion pipe is
The guide part splits the gas into the rich gas chamber side and the mixing chamber side, ejects and burns from the rich side flame hole in the upper part of the rich gas chamber to form a rich flame, and the gas flowing into the mixing chamber is exchanged with the air flowing through the air passage. After mixing, a light gas is generated and ejected from the light side flame hole and burned to form a light flame. In this way, by simply disposing the rich / lean flame hole structure on the upper part of the Bunsen type combustion device, it is possible to easily change to the rich / lean combustion system using an existing one.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

Reference numeral 1 is a combustion tube having a flame hole 2 in the upper portion thereof, which is provided with a venturi portion (not shown), a nozzle and the like, and also has a pressure reducing wall 3 for forming a supplementary flame. It constitutes a Bunsen type combustion device.

Reference numeral 5 is a rich / lean flame hole forming body formed in the upper part of the Bunsen type combustion apparatus, and is partitioned and formed so that the rich gas chamber 6 is located above the combustion tube 1 and the mixing chamber 7 is located above the air passage 4. A dense flame hole 8 is provided above the rich gas chamber 6, and a light flame hole 10 is provided above the mixing chamber 7 by a light flame former 9 and the gas from the ejection holes 2 of the combustion pipe 1 is provided at the lower part. 6 and a mixing chamber 7 are provided with a guide portion 11 for branching the flow. A guide portion 11 of the rich and rich flame hole structure 5 is arranged with a gap 12 of about 1 mm from the combustion pipe flame hole surface. Reference numeral 13 is a blocking plate provided on both sides of the rich and rich flame hole structure 5 to prevent air from flowing in and to form rich flame at both end portions.

The dense flame hole 8 of this embodiment is provided with a rich gas chamber 6
Although the upper surface is formed in a slit shape, the upper surface of the rich gas chamber 6 may be opened to form the thick flame hole 8 as shown in FIG.

In the above structure, during combustion, the rich gas in the combustion tube 1 is ejected from the ejection holes 2 in the upper portion, and is divided by the guide portion 11 toward the rich gas chamber 6 and the mixing chamber 7 formed above the combustion tube 1. The gas flowing and flowing into the rich gas chamber 6 is jetted and burned from the dense flame hole 8 provided at the upper portion to form a rich flame, and at the same time, the mixing chamber 7
The gas flowing into the air mixes with the air flowing through the air passage 4,
A light gas is generated and jetted and burned from the light side flame hole 10 provided in the upper part to form a light flame. Thus, the rich and rich flame hole structure 5 is provided above the combustion tubes 1 arranged side by side, so that rich and lean flames are alternately formed and stable rich and lean combustion can be performed. Further, if the outer side of the entire flame becomes a light flame, the combustion becomes unstable. Therefore, the closing plate 13 is provided on the outermost side to block the inflow of air and form the rich flame to stabilize the combustion.

[0012]

As described above, according to the present invention, a thick-side flame hole and a light-side flame hole are formed above the Bunsen type combustion apparatus in which a plurality of combustion tubes are arranged side by side with an air passage. Providing a rich and rich flame hole structure, rich gas from the ejection hole of the combustion tube to the rich side flame hole,
In addition, since the light gas generated by mixing with air is separately supplied to the light side flame hole, it is possible to easily perform rich and lean combustion, and easily change to the rich and lean combustion method using the existing Bunsen type combustion device. However, NOx can be reduced.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of an essential part showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion pipe 2 Jet hole 4 Air passage 5 Concentration flame hole structure 6 Concentration gas chamber 7 Mixing chamber 8 Thick side flame hole 10 Light side flame hole 11 Guide part 12 Gap

Claims (1)

[Claims] 1. A Bunsen type combustion apparatus in which a plurality of combustion tubes having ejection holes in the upper portion are arranged side by side with an air passage, and in the upper portion, a rich gas chamber is provided above the combustion tubes and a mixing chamber is provided above the air passage. Is formed so that the dark side flame hole is formed in the upper part of the rich gas chamber, the light side flame hole is provided in the upper part of the mixing chamber, and the guide part is provided in the lower part of the rich gas chamber. The combustion apparatus is characterized in that the guide portion is arranged with a gap from the upper surface of the combustion tube so that the gas from the ejection hole of the combustion tube is divided into the rich gas chamber and the mixing chamber.