JPH0656436A - Burner made of quartz glass - Google Patents

Abstract

PURPOSE:To provide a burner made of quartz glass, producible at a low cost and capable of giving stable high-temperature flame with small amount of gas without increasing the number of nozzles and reducing the nozzle diameter. CONSTITUTION:An oxygen nozzle 2 is inserted from the back into a tubular hydrogen hood 1 having opened end and the tip end of the oxygen nozzle 2 is positioned slightly behind the tip end of the hood. In the oxyhydrogen flame burner made of quartz glass and having the above structure, a flange 3 to generate a vortex flow of hydrogen gas flowing along the outer surface of the oxygen nozzle is attached to the tip end of the nozzle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quartz glass burner suitable for heating an object to be processed at high temperature, for example, when processing quartz glass.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 9 and 10, a quartz hydrogen hood 1 made of quartz glass with an open end is used as a burner for heating a workpiece at high temperature when processing quartz glass. One or more oxygen nozzles 2 made of quartz glass are inserted concentrically from the rear, and the tip of the oxygen nozzles 2 is arranged so as to be located slightly inside the tip of the hydrogen hood 1. The external mixed burner is mainly used.

Normally, one oxygen nozzle is used for processing quartz.
A single nozzle burner (FIG. 9) made into a book is used, and a four nozzle burner (FIG. 10) having four oxygen nozzles is used for producing quartz glass, but recently, a higher temperature is required. 16 nozzle burners and 32 nozzle burners, in which the number of oxygen nozzles is further increased, are used to reduce the diameter of the nozzles.

[0004]

As described above, recently, in order to obtain a high temperature, it has been attempted to increase the number of nozzles of a quartz glass burner and reduce the diameter of each nozzle. However, such a burner has a problem in that the structure is complicated, the manufacturing cost is significantly increased, and the amount of gas used is increased.

Therefore, it has been desired to develop a burner which can obtain a high-temperature flame with a small amount of gas and has a low manufacturing cost.

The inventors of the present invention have made extensive studies in order to solve such a problem. As a result, by attaching a flange to the tip of the oxygen nozzle of the external mixing type burner, a vortex flow is generated in the hydrogen flow to generate a high temperature flame. It was found that it can be obtained.

The present invention has been made on the basis of such knowledge, and compared with the conventional external mixing burner having the same number of nozzles and the same nozzle diameter, a quartz glass capable of obtaining a stable high temperature flame with a small amount of gas. The purpose is to provide a burner made of metal.

[0008]

In the quartz glass burner of the present invention, an oxygen nozzle is inserted from the rear into a tubular hydrogen hood having an open tip, and the tip of the oxygen nozzle is slightly inward from the hood tip. The oxyhydrogen flame quartz glass burner to be positioned is characterized in that a flange for attaching a vortex to hydrogen flowing along the outer surface of the nozzle is attached to the tip of the oxygen nozzle.

According to the present invention, as shown in FIGS. 1 and 2, by attaching the flange 3 to the tip of the oxygen nozzle 2, the hydrogen gas becomes a circulating flow between the hydrogen hood 1 and the oxygen nozzle 2 to generate a swirl. Hot combustion gas is entrained in the vortex,
This serves as an ignition source to raise the temperature of the flame. Therefore, the high temperature of the oxyhydrogen flame can be achieved without changing the burner diameter and without increasing the number of oxygen nozzles.

As for the shape of the flange, as a result of trying various flange shapes as shown in FIG. 3, a comparatively thin shape (a)
Was the most liked. As examples of its application, the roasted shape (b), the thick shape (c), the rifle groove (d), the fine hole (e), etc. can be heated to a high temperature.

The dimensions of the flange 3 are appropriately adjusted and determined within a range that produces a vortex in the hydrogen gas flow in relation to the hydrogen hood inner diameter X and the flange outer diameter Z as shown in Table 1.

[0012]

By attaching a flange to the tip of the oxygen nozzle, a vortex is generated in the hydrogen flow to obtain a high temperature flame.

[0013]

EXAMPLES Examples of the present invention will be described below.

Example 1 The shape of the tip of the burner is shown in FIGS. 4 (a) and 4 (b).
As shown in (a) and (b), four types of burners (one nozzle burner) with no flange and two with flange were produced. Using this burner, the gas flow rate at which the flame can be maintained and the flame temperature at a constant gas flow rate were investigated when the amount of gas was changed. Then, comparison was made with and without the flange 3. The results are shown in Table 1. X is the inner diameter of the hood, and Z is the outer diameter of the flange. Example 2 Using the four types of burners of Example 1, the flame shape (FIG. 6) and flame temperature were examined under the condition that the gas amount was constant. And flange 3
Comparison was made with and without.

The amount of gas is 6 liters / min of hydrogen and 3
It was performed at liter / min. The method of investigating the flame shape and flame temperature of the burner was as shown in FIG. 8 using a B-type thermocouple 7 and a thermotracer (measurement wavelength 8 to 13 μm) 5. The results are shown in Table 2. L is the length of the flame. The flame temperature is the highest temperature.

Example 3 As shown in FIGS. 10 and 2, two types of burners (four nozzle burners), one without a flange and one with a flange, were prepared. Using this burner, the flame shape (FIG. 7) and the flame temperature were examined under a constant gas amount condition. Then, comparison was made with and without the flange 3.

The amount of gas is hydrogen 20 liter / min, oxygen 10
It was performed at liter / min. The method of investigating the flame shape and flame temperature of the burner was the same as in Example 2. The results are shown in Table 3. L is the length of the flame. The flame temperature is the highest temperature.

[0018]

[Table 1]

[Table 2]

[Table 3] As shown in Table 1, we compared the gas flow rate to obtain a high temperature flame of 1600 ° C with and without a flange as shown in Table 1 and found that the gas efficiency was better than that without a flange at the nozzle tip. Good. Also, as shown in Table 2 (single nozzle burner), having a flange at the tip of the nozzle gives a stable flame shape with a shorter flame length (L) than that without a flange, and maintains a high temperature flame. did it. The maximum flame temperature has increased by about 6-10%.

As shown in Table 3 (4 nozzle burners),
A stable flame shape with a short flame length (L) was obtained as compared with the case where there was no flange at the nozzle tip, and high temperature flame could be maintained.

By using the burner of the present invention, when processing or manufacturing quartz, it is possible to heat the processing target portion with the same capacity with a small amount of gas, and it is possible to manufacture quartz glass with good gas efficiency.

[0021]

As described above in detail, according to the present invention, it is possible to obtain a stable high temperature flame with a small amount of gas.
It also made it possible to reduce the cost of burner production.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a single nozzle burner with a flange of the present invention.

FIG. 2 is a sectional view schematically showing a four nozzle burner with a flange according to the present invention.

FIG. 3 shows an oxygen nozzle tip (a) according to the present invention and an application example of the tip, which has a lost shape (b), a thick shape (c), a rifle grooved shape (d), and a fine shape. It is a perspective view which expands and shows what has a hole (e) etc. typically.

FIG. 4 is an enlarged schematic cross-sectional view of tip shapes (a) and (b) of a single nozzle burner without a flange among the four types used in the first embodiment.

FIG. 5 is an enlarged schematic cross-sectional view of tip shapes (a) and (b) of a single nozzle burner with a flange among four types used in the first embodiment.

FIG. 6 shows flame shapes (a), (b), which were examined in Example 2.
It is a schematic diagram which shows (c) and (d).

FIG. 7 is a schematic diagram showing flame shapes (a) and (b) investigated in Example 3.

FIG. 8 is a schematic diagram showing a method for measuring a flame temperature distribution of a burner.

FIG. 9 is a sectional view schematically showing a conventional single nozzle burner.

FIG. 10 is a sectional view schematically showing a conventional four-nozzle burner.

[Explanation of symbols] 1 ... Burner, 1 ... Hydrogen hood, 2 ... Oxygen nozzle, 3 ... Flange, 4 ... Flame, 5 ... Thermotracer, 6 ... Quartz glass plate, 7 ... Thermocouple, 8 ... Low temperature part, 9 ... High temperature part, L ... Flame length, X ... Hood inner diameter, Y ... Nozzle outer diameter, Z ... Flange outer diameter

Claims (1)

[Claims] 1. An oxyhydrogen flame quartz glass burner in which an oxygen nozzle is inserted from the rear into a tubular hydrogen hood having an open tip, and the tip of the oxygen nozzle is positioned slightly inward of the hood tip. A quartz glass burner, characterized in that a flange for causing a vortex to flow in hydrogen flowing along the outer surface of the nozzle is attached to the tip of the oxygen nozzle.