JP2006250398A - Bunsen burner for industry - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively work a comparatively large product by obtaining flame shape and flame temperature similar as those of 5C gas by a gas having a property different from that of 5C gas in a bunsen burner. <P>SOLUTION: This bunsen burner comprises an air-fuel mixture supply portion 2 and a burner portion 3 having a diameter larger than the air-fuel mixture supply portion 2, a mixing recirculating area 4 secured by the difference in diameters of the air-fuel mixture supply portion 2 and the burner portion 3 is formed near a bottom surface 31 of the burner portion 3 around an outlet 21 of the air-fuel mixture supply portion 2, and the bottom surface 31 has an auxiliary air hole 5 for supplying the air toward the burner 32 direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an industrial Bunsen burner, and more particularly to an industrial Bunsen burner used in the production and industry of annealing, cutting, cutting, preheating, slow cooling, brazing, ceramic pots, etc. of metals.

As prior art document information of the Bunsen burner related to the present invention, there is the following Patent Document 1.
This Bunsen burner is a relatively small one used in a water heater, a heater, etc., and its problem is to reduce NOx during combustion.
JP-A-6-88608

By the way, the gas used in industrial Bunsen burners for processing relatively large products used in the production and industry of metal cutting, cutting, preheating and slow cooling, brazing, ceramic pots, etc. A seed was used.
A typical example is 5C gas, which has recently been converted to 13A gas (natural gas) that has a higher calorific value and is more environmentally friendly due to the unification of gas types.
However, when the 13A gas is used as it is with a 5C gas bunsen burner, flame lift phenomenon, blow-off, incomplete combustion, and other problems occur, and a flame temperature equivalent to 5C gas is obtained. I couldn't.
Therefore, a change to a blast burner that can provide a flame equivalent to 5C gas even in 13A gas is performed.
However, in the case of the blast type burner, because of the structure, many auxiliary equipments such as an air blower and a mixer are necessary. Therefore, the blast type burner is more expensive than the Bunsen type burner, and the maintenance cost for the auxiliary equipment is also greatly different. In addition, it is necessary to secure an installation space for ancillary equipment, which is considered disadvantageous when used as an industrial burner for processing relatively large products.

  Therefore, the present invention aims to obtain a flame form and a flame temperature equivalent to 5C gas with a gas having a different property from 5C gas in a Bunsen burner, and to enable processing of a relatively large product at a low cost. The purpose is to provide an industrial Bunsen burner that solves the problem.

In order to achieve the above object, the present invention employs the following technical means.
The technical means comprises (a first aspect of the invention) an air-fuel mixture supply part and a crater part having a diameter larger than that of the air-fuel mixture supply part, and these are located near the bottom of the crater part around the outlet of the air-fuel mixture supply part. It has a mixed recirculation region secured by the difference in diameter between the air-fuel mixture supply part and the crater part, and has an auxiliary air hole for supplying air toward the crater direction on the bottom surface.
With this configuration, the air is sucked into the mixture recirculation region due to the negative pressure generated when the air-fuel mixture is supplied, and the inside of the crater is over-absorbed, and the air is supplied in the direction of the crater to assist around the main flame. A flame is formed.
Here, the mixed recirculation region is a region in which a part of the air-fuel mixture ejected into the crater part circulates in the crater part and the air-fuel mixture burns as an auxiliary flame.
Further, from the viewpoint of changing the flame form (spreading and length) according to the target product (second invention), an air-fuel mixture adjusting pipe is projected at the outlet of the air-fuel mixture supplying section, and the air-fuel mixture adjusting pipe It is preferable to make the length of each variable.
As a configuration for changing the length of the air-fuel mixture adjusting tube, for example, (3rd invention) By making the air-fuel mixture adjusting tube detachable from the outlet, an air-fuel mixture adjusting tube that forms the target flame form The structure which can be exchanged is mentioned.

According to the present invention, the following excellent effects can be expected.
According to the first aspect of the present invention, air is supplied from the auxiliary air hole into the crater portion due to the negative pressure of the air-fuel mixture supplied from the air-fuel mixture supply pipe, so that the inside of the crater portion is in an over-absorbed air state. And incomplete combustion is avoided.
Further, the air from the auxiliary air hole is supplied so as to push out a part of the air-fuel mixture reaching the air-mixing recirculation region through the gas-mixing recirculation region by the momentum at the time of suction due to the negative pressure of the air-fuel mixture. Therefore, the auxiliary flame around the main flame can be vigorously burned in the crater direction by the combustion of the air-fuel mixture.
That is, the required flame temperature can be secured by improving the combustion efficiency of the air-fuel mixture, and the spread of the flame can be suppressed by burning the auxiliary flame vigorously in the crater direction.
Therefore, it is possible to obtain a flame form and a flame temperature equivalent to 5C gas with a gas having a different property from 5C gas in a Bunsen burner, and to process a relatively large product at low cost.
Furthermore, since the inside of the crater is cooled by the air from the auxiliary air hole, overheating of the Bunsen burner can be suppressed.
Therefore, the Bunsen burner can be configured using a metal material other than the heat-resistant metal material, which is effective in providing the Bunsen burner at a low cost.
Further, according to the second aspect of the present invention, the optimum flame for the product to be processed can be obtained by attaching the air-fuel mixture adjusting tube capable of obtaining the target flame.
Further, according to the third invention, the second invention can be specifically implemented.

Hereinafter, the best mode for carrying out the industrial Bunsen burner of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention, and FIG. 4 shows a second embodiment of the present invention.

A first embodiment of an industrial Bunsen burner (hereinafter abbreviated as “burner”) 1 has a cylindrical shape with a diameter larger than that of the air-fuel mixture supply unit 2 in front of the air-fuel mixture supply unit 2. The crater portion 3 is integrally formed on a coaxial line.
In addition, in the vicinity of the bottom 31 of the crater portion 3 around the outlet 21 of the mixture supply section 2, there is a mixture recirculation region 4 secured by the difference in diameter between the mixture supply section 2 and the crater section 3. Yes.
Furthermore, an auxiliary air hole 5 for supplying air toward the crater 32 is provided on the bottom surface 31.

When the air-fuel mixture is supplied from the air-fuel mixture supply unit 2 into the crater unit 3, the burner 1 having the above-described configuration has a negative pressure generated when the air-fuel mixture is supplied at the same time that part of the air-fuel mixture reaches the mixing recirculation region 4. As a result, air is sucked from the auxiliary air hole 5 so that the inside of the crater portion 3 is in an excessively sucked air state.
Since the air from the auxiliary air hole 5 is supplied in the direction of the crater 32, the auxiliary flame B is formed around the main flame A by the momentum of the air, and the spread of the flame is suppressed by the auxiliary flame B. .

For example, as shown in FIG. 3, the burner 1 of this embodiment has a large number of burners 1 piped at regular intervals along the axis of a gas pipe 7 to which a gas supply pipe 6 is piped. It is used in the form used when overheating such a long product.
Further, the burner 1 can be used as a so-called “baking unevenness” of a single stand type (not shown) in which a pipe is piped to the tip of a tubular body.

The burner 1 </ b> A of the second form is configured such that the air-fuel mixture adjusting pipe 8 is provided at the outlet 21 of the air-fuel mixture supply unit 2.
Note that the burner 1A is the same as the configuration exemplified in the first embodiment except for the air-fuel mixture supply unit 2, and therefore the description of the overlapping portions is omitted.

The air-fuel mixture adjusting pipe 8 is formed in a tubular body having the same diameter as the outlet 21 and is provided in communication with the outlet 21 on the same axis.
The air-fuel mixture adjusting pipe 8 is detachably attached to the outlet 21 so that it can be arbitrarily replaced with another air-fuel mixture adjusting pipe (not shown) of different length prepared in advance. Yes.
That is, the burner 1 </ b> A of this embodiment can obtain various flame forms by changing the length of the mixing adjustment pipe 8.
In addition, about the attachment / detachment structure with respect to the exit 21 of the said air-fuel | gaseous adjustment pipe | tube 8, since it is possible by well-known structures, such as fitting, a helical joining, or a screw stop, illustration is abbreviate | omitted.

(First embodiment)
Hereinafter, the burner 1 exemplified in the first embodiment, a burner excluding the auxiliary air hole in the burner (hereinafter referred to as “comparative burner A”), and a known burner (hereinafter referred to as “comparative burner B”). ) To measure each flame form and flame temperature, and compare the measurement results.
In addition, the diameter of the crater and the mixture supply part diameter of each burner used for this measurement are the same diameter.
Moreover, the gas used for this measurement is 13A gas.

The flame form formed in the burner 1 was confirmed to be an extremely stable flame form with a very small flame spread compared with the flame form in the comparative burners A and B.
The temperature of the flame formed in the burner 1 was 1050 ° C. near 150 mm from the crater 32, 1150 ° C. near 250 mm, 1050 ° C. near 350 mm, and 850 ° C. near 450 mm.
The temperature of the flame formed in the comparative burner A is 900 ° C. near 150 mm from the crater, 1050 ° C. near 250 mm, 900 ° C. near 350 mm, 900 ° C. near 350 mm, and 800 ° C. near 450 mm. The temperature of the flame formed in the comparative burner B is 950 ° C. near 150 mm from the crater, 1050 ° C. near 250 mm, 900 ° C. near 350 mm, 850 ° C. near 450 mm, and the flame of the burner 1 from the crater to 450 mm It was confirmed that the temperature was high.
That is, from the above measurement results, the burner 1 of the present embodiment is a Bunsen type, but even if 13A gas is used, it is possible to obtain a flame having the same characteristics as when 5C gas is used for both the flame form and the flame temperature.
Moreover, since the burner 1 is cooled by the air sucked from the auxiliary air holes, it can be expected that the overheating of the burner 1 is suppressed.
Further, various flame temperatures and flame forms can be obtained by arbitrarily changing the diameter and number of the auxiliary air holes 5.

(Second embodiment)
Below, the flame form of the burner 1A illustrated by the said 2nd form was measured and compared for every air-fuel mixture adjusting pipe 8 from which length differs.
The length of the air-fuel mixture adjusting tube used in this example is 10 mm, 15 mm, and 20 mm.
As a result, the flame in the 10 mm mixture adjustment tube was the widest and short form, and the flame in the 20 mm mixture adjustment pipe was the thinnest and long form.
That is, it was confirmed that the shorter the air-fuel mixture adjusting pipe, the wider and shorter the flame form, and the longer and narrower the form.
Therefore, the burner 1A that can obtain an optimum flame for the product to be heated can be configured by appropriately selecting and replacing the air-fuel mixture adjusting pipe.

  It should be noted that the present invention is not limited to the illustrated embodiments, and can be implemented with configurations within a range that does not deviate from the contents described in the respective claims.

Sectional drawing which shows the 1st form of the Bunsen type burner which concerns on this invention. FIG. 2 is a sectional view taken along line (2)-(2) in FIG. 1. An example of using a Bunsen burner is shown. Sectional drawing which shows the 2nd form of the Bunsen type burner which concerns on this invention.

Explanation of symbols

1: Burner 2: Mixture supply section 21: Outlet 3: Tinder section 31: Bottom 32: Tinder 4: Mixing recirculation area 5: Auxiliary air hole 8: Mixture adjustment pipe A: Main flame B: Auxiliary flame

Claims (3)

  The mixture supply portion and a crater portion having a diameter larger than that of the mixture supply portion, and in the vicinity of the bottom surface of the crater portion around the outlet of the mixture supply portion, the diameter of the mixture supply portion and the crater portion. An industrial Bunsen burner having a mixing recirculation region secured by the difference and having auxiliary air holes on the bottom surface for supplying air toward the crater.   2. The industrial Bunsen burner according to claim 1, wherein an air-fuel mixture adjusting pipe projects from an outlet of the air-fuel mixture supply section, and the length of the air-fuel mixture adjusting pipe is variable.   The industrial Bunsen burner according to claim 2, wherein the air-fuel mixture adjusting pipe is detachably attached to the outlet so that the air-fuel mixture adjusting pipe can be replaced with an air-fuel mixture adjusting pipe that forms a target flame form.

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