JP3109360B2 - 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 system.

[0002]

2. Description of the Related Art Conventionally, there is a lean-burn combustion system as one of the combustion systems for reducing NOx, and various structures have been proposed. For example, Japanese Patent Publication No. 57-12923 discloses a method using a flame-perforated plate made of ceramic or the like, but is expensive in production. Further, there is a metal tube combustion tube system described in, for example, Japanese Patent Application Laid-Open No. 2-306005, which is a double-structure combustion tube and has a complicated structure. Also, for example, Japanese Patent Application Laid-Open No. 3-2
As described in JP-A-63501, there is a structure in which first burners on the light side and second burners on the dark side are alternately arranged side by side, but the structure is simplified, but there are the following problems. .

[0003]

That is, a structure in which a large number of combustion pipes are closely arranged side by side and the combustion pipes on the rich side and the light side are alternately adjacent to each other can have a simple combustion pipe structure. The accuracy of the burner case (positioning of the combustion tube) is required, and if there is a gap due to lack of closeness, air may flow between the burners. In this case, the light burner's flame resistance against lifting Greatly decreases.

[0004] The present invention provides a combustion system in which rich and light combustion can be easily performed by using a general Bunsen-type combustion device in which combustion tubes are juxtaposed with a gap serving as a secondary air passage. It is intended to provide a device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a Bunsen type combustion apparatus in which a plurality of combustion pipes having an ejection hole at an upper portion are arranged side by side with an air passage.
On the upper part, a rich gas chamber is formed above the combustion pipe, and the mixing chamber is formed above the air passage.A rich flame hole is provided above the rich gas chamber, and a light flame hole is provided above the mixing chamber. A gas flame component having a guide portion provided at a lower portion of the gas chamber, wherein the guide portion is provided on the upper surface of the combustion tube so that gas from the discharge hole of the combustion tube is divided into the rich gas chamber and the mixing chamber. It is arranged with a gap.

[0006]

[Function] At the time of combustion, the gas ejected from the ejection hole of the combustion tube is
The guide divides the mixture into the rich gas chamber side and the mixing chamber side, and blows out 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 mixed with air flowing through the air passage. The mixture is mixed to produce a lean gas, which is blown out and burned from a lean side flame hole to form a lean flame. As described above, by simply disposing the dense flame hole structure on the upper part of the Bunsen-type combustion apparatus, the existing apparatus can be used to easily change to the dense combustion method.

[0007]

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

Reference numeral 1 denotes a combustion tube having a flame hole 2 at an upper portion, which is provided with a venturi portion, a nozzle, etc. (not shown), and has a decompression wall 3 for forming a supplementary flame. It constitutes a Bunsen-type combustion device.

Reference numeral 5 designates a rich flame hole formed at the upper part of the Bunsen-type combustion device, which is defined so that a rich gas chamber 6 is located above the combustion tube 1 and a mixing chamber 7 is located above the air passage 4. In the upper part of the rich gas chamber 6, a rich flame 8 is provided in the upper part of the mixing chamber 7, and in the lower part of the mixing chamber 7, a light flame 10 is provided by a light body 9. A guide portion 11 for diverting the flow to the mixing chamber 6 and the mixing chamber 7 is provided. A guide portion 11 of the dense flame hole structure 5 is disposed with a gap 12 of about 1 mm from the combustion tube flame hole surface. Numeral 13 denotes closing plates provided on both sides of the dense flame hole structure 5 to prevent the inflow of air and form a rich flame at both ends.

The dense-side flame hole 8 of this embodiment is provided in the dense gas chamber 6.
Although a slit is formed in the upper surface, the upper surface of the dense gas chamber 6 may be opened as the dense flame hole 8 as shown in FIG.

In the above configuration, during combustion, the concentrated gas in the combustion tube 1 is ejected from the upper ejection hole 2 and divided by the guide portion 11 to the concentrated gas chamber 6 formed above the combustion tube 1 and the mixing chamber 7. The gas flowing into the rich gas chamber 6 blows out and burns from the rich side flame hole 8 provided at the upper portion to form a rich flame, and the mixture chamber 7
Is mixed with air flowing through the air passage 4,
Light gas is generated, and is blown out from a light-side flame hole 10 provided at an upper portion to form a light flame. The rich flame and the light flame are alternately formed by the dense flame hole constituting member 5 above the combustion pipes 1 arranged side by side in this way, so that stable rich and light combustion can be performed. Further, since the combustion becomes unstable when the entire flame becomes light flame, the closing plate 13 is provided on the outermost side to prevent the inflow of air, thereby stabilizing the combustion by forming a rich flame.

[0012]

As described above, according to the present invention, a dense side flame hole and a light side flame hole are defined above a Bunsen type combustion device in which a plurality of combustion tubes are juxtaposed with an air passage. A dense flame hole structure is provided, and the concentrated gas from the discharge hole of the combustion tube is
In addition, since lean gas generated by mixing with air is diverted and supplied to the light-side flame holes, it is possible to easily perform lean-burn combustion, and simply switch to the lean-burn method using the existing Bunsen-type combustion device. In addition, NOx can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a main part showing another embodiment.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-273907 (JP, A) JP-A-5-280713 (JP, A) JP-A-5-180418 (JP, A) 263507 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F23D 14/02-14/08 F23D 14/62 F23C 11/00 329-330

Claims (1)

(57) [Claims] 1. A Bunsen-type combustion apparatus having a plurality of combustion tubes having ejection holes at an upper portion thereof arranged side by side with an air passage, a rich gas chamber above the combustion tubes, and a mixing chamber above the air passages. Are formed so as to be located, and a rich-side flame hole is provided in the upper part of the rich-gas chamber, a light-side flame hole is provided in the upper part of the mixing chamber, and a rich-light-and-flame hole structure having a guide portion provided in the lower part of the rich-gas chamber is formed. The combustion device, wherein the guide portion is disposed with a gap between the upper surface of the combustion pipe and the upper surface of the combustion pipe so that the gas from the ejection hole of the combustion pipe is divided into the rich gas chamber and the mixing chamber.