JPH05126322A - Soot generating burner - Google Patents

Abstract

PURPOSE:To provide a soon generating burner, the equipment cost of which can be reduced and which is capable of reducing the running cost for soot generation. CONSTITUTION:A cylindrical member 1 with bottom has air introduction ports 2 on the side of its bottom section, and in the bottom side of the cylindrical member 1 with bottom a flame port forming member 3 is provided. The flame port forming member 3 is for burning the fuel gas in a laminar state in the cylindrical member 1 by making the fuel gas flow out towards the open port of the cylindrical member 1 with bottom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soot generating burner.

[0002]

2. Description of the Related Art Such a soot-generating burner is, for example, a glass tube and a roller which have high heat when a desired product is processed by heating the glass tube while rotating it with a roller to perform molding and cutting. Therefore, in order to prevent the adhesion, the soot is attached to the surface of the glass tube in advance. Conventionally, a mixing chamber having one end opened is formed inside the nozzle, and fuel gas is supplied from a fuel gas supply hole provided at the bottom of the mixing chamber and oxygen is supplied to the mixing chamber from the oxygen supply hole to mix them. After that, in the burner configured to be jetted from the opening and burned, the amount of oxygen supplied is set to 10 to the amount necessary to completely burn the fuel gas.
Soot was generated by incomplete combustion at 40% (see JP-A-2-97812).

[0003]

However, in the above-mentioned conventional soot generating burner, acetylene gas or LPG is used as the fuel gas, and oxygen is used as the combustion improver, and it is necessary to adjust the supply amount of the fuel gas or oxygen. However, the cost of the burner becomes high because it is necessary to separately provide oxygen supply means and gas amount adjustment means. Also, because special fuel gas and oxygen are used, running costs for generating soot There was a problem that it would be high. The present invention has been made in view of such circumstances, and an object thereof is to reduce the cost of the soot-generating burner and the running cost for generating soot.

[0004]

The soot-generating burner according to the present invention is characterized in that a fuel gas is supplied to the bottom side of a bottomed tubular member having an air introduction hole at the bottom side. The point is that a flame port forming member is provided for flowing out toward the opening side and burning in a laminar flow state inside the bottomed tubular member.

[0005]

According to the above characteristic structure, the fuel gas flows out from the flame port forming member at a flow velocity that does not cause a turbulent state, and the combustion gas sucked from the air introduction hole by the action of the jetted fuel gas and the flow of the fuel gas. By mixing with the working air at the interface with each other, the fuel gas burns in a laminar flow state inside the bottomed tubular member. A flame that burns in a laminar state heats the air between the flame and the bottomed tubular member, and the high-temperature air thermally decomposes the fuel gas that has not completely burned, so that the thermally decomposed soot is generated. The contained incomplete combustion gas flows out from the opening of the bottomed cylindrical member, and soot can be effectively generated.

[0006]

As a result, unlike the prior art, since oxygen is not used as a combustion improver, it is not necessary to provide oxygen supply means, and the combustion air is simply sucked from the air introduction hole by the action of fuel gas flow. However, it is not necessary to provide a gas amount adjusting means because the fuel gas is simply mixed with the fuel gas and the supply amount of the combustion air does not need to be adjusted, so that the cost of the soot generating burner can be reduced. Further, a large amount of soot could be generated even with a gas having a low carbon content in the fuel gas such as methane gas. Furthermore, since oxygen is not used as a combustion improver, the running cost for generating soot can be reduced.

[0007]

Embodiments Next, embodiments will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a bottomed cylindrical member, which is located at a position on the peripheral wall of the bottomed cylindrical member 1 near the bottom 1A side.
Four air introduction holes 2 are formed on the same circumference. The bottom portion 1A of the bottomed tubular member 1 is provided with a one end side opening 3A for allowing the fuel gas supply pipe 3 as a flame port forming member to be in the same axial core state as the bottomed tubular member 1 and functioning as a flame port. The bottomed tubular member 1 is inserted in a state of being positioned at a predetermined position on the way in the length direction.

Then, the fuel gas such as natural gas is supplied to the flame outlet 3A.
Flow out toward the opening side of the bottomed tubular member 1 at a slow predetermined flow rate so as not to be in a turbulent state, and the combustion air is sucked from the air introduction hole 2 by the action of the fuel gas flow, and the fuel gas The fuel gas burns in the laminar flow state in the inside of the bottomed tubular member 1 in the state of forming the elongated flame F by the mixing of the fuel gas and the combustion air at the interface with each other.

Next, in carrying out the present invention, an example of a preferable dimensional relationship of each part will be described.

However, the length of the bottomed tubular member 1 is c, the distance between the bottom 1A of the bottomed tubular member 1 and the center of the air introduction hole 2 is a, the bottom 1A of the bottomed tubular member 1 and the flame. The distance from the port 3A is b, the inner diameter of the bottomed tubular member 1 is d, the inner diameter of the fuel gas supply pipe 3 is e, and the diameter of the air introduction hole 2 is g.

For the length c of the bottomed tubular member 1, a =
If 0.36c, b = 0.41c, and the inner diameter d of the bottomed tubular member 1 is d = 0.11c with respect to the length c, then e
Each part is configured with dimensions having a relationship of = 0.22d and g = 0.19d. The tolerance of the size of each part is ± 1
5%.

When the fuel gas is ejected from the flame nozzle 3A at a flow velocity in the range of 0.84 to 1.25 cm / sec, the diameter f of the flame F is the inner diameter d of the bottomed tubular member 1 as shown in the figure.
It is possible to burn the fuel gas in a laminar flow state in a state where a slender flame of about 1/3 of the above is formed, and soot can be effectively generated.

In addition, when increasing or decreasing the amount of soot generated, N out of the dimensions of each of the above parts is a, b, and c, respectively.
(A predetermined positive real number) may be multiplied, and d, e, and g may be respectively multiplied by the square root of N.

[Other Embodiments] Next, other embodiments will be listed.

The dimensional relationship of each part is not limited to the above embodiment, and the flow velocity of the fuel gas is not limited to that of the above embodiment, and the fuel gas ejected from the flame port 3A forms an elongated flame. It can be appropriately set within a range in which combustion can be performed in a laminar flow state under the above conditions.

The diameter and the number of the air introduction holes 2 are not limited to those in the above embodiment, and can be set as appropriate according to the combustion state of the fuel gas.

In the above-described embodiment, the case where the air introduction hole 2 is formed in the peripheral wall of the bottomed tubular member 1 has been exemplified, but instead of this, a fuel gas supply pipe is provided at the bottom 1A of the bottomed tubular member 1. A plurality of circles concentric with 3 may be formed with a predetermined diameter.

The fuel gas is not limited to the natural gas shown in the above embodiment, but may be a combustible gas containing carbon, such as methane, which is a saturated gas having a low carbon ratio. Is also good.

The opening of the bottomed tubular member 1 may be narrowed.

The flame port 3A may be composed of a plurality of holes.

The bottomed tubular member 1 may be configured so that its length c can be changed.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view of a soot generation burner.

[Explanation of symbols]

 1 Bottomed cylindrical member 2 Air introduction hole 3 Flame port forming member

Claims (1)

[Claims] 1. A fuel gas flows toward the opening side of the bottomed tubular member (1) to the bottom side of the bottomed tubular member (1) having an air introduction hole (2) formed on the bottom side. The soot-generating burner is provided with a flame port forming member (3) for burning in a laminar flow state inside the bottomed tubular member (1).