JPH1151334A - Gas burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas burner enabling the maintenance of the function of a burner tip, in case of forming gas burner formed with the point of the burner tip on the upstream side of a second pipe. SOLUTION: In a gas burner provided with a first pipe 1 discharging fuel gas through a burner tip 4 arranged to the point part of the burner circulating the fuel gas inside it, a second pipe 2 surrounding the outer circumference of the first pipe 1 and discharging oxygen containing gas through the point side of it circulating the oxygen containing gas inside the surrounded space, and a cooling pipe 3 surrounding the outer circumference of the second pipe 2 formed with an outward path 3a and an inward path 3b of coolant, the first pipe 1 is arranged forming the point of the burner tip 4 on the upstream side of the point of the second pipe 2 and making the burner tip 4 with ceramic material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first pipe portion for allowing fuel gas to flow therein and discharge it from a burner tip provided at a tip end thereof, and to surround an outer peripheral portion of the first pipe portion while surrounding the first pipe portion. A second pipe portion for flowing the oxygen-containing gas in the separated space and discharging the gas from the distal end portion, and a cooling device provided so as to surround the outer peripheral portion of the second pipe portion and having the outward path and the return path of the cooling medium formed therein. And a gas burner having a pipe section.

[0002]

2. Description of the Related Art Conventionally, as a gas burner of this type, a first pipe portion is arranged so that a tip of a burner tip is substantially at the same position as a tip of a second pipe portion, and a burner tip is made of Inconel or stainless steel. What was formed with a metal material was known. In such a gas burner, in order to protect the tip of the gas burner from heat from the outside and the flame, the cooling pipe is extended to the tip of the second pipe, and the tip of the gas burner is cooled using a cooling medium such as water. It was cool.

On the other hand, there is known a technique for adjusting the positional relationship between the tip of the burner tip and the tip of the second pipe portion to adjust the shape of the flame, that is, the length, thickness, and spread of the flame. .

[0004]

However, in the above-described gas burner, in order to adjust the length and thickness of the flame, the first end of the burner tip is located upstream of the end of the second pipe portion. When the tube portion is arranged, the flame approaches or contacts the inside of the second tube portion, heating the portion and transferring the heat to the upstream side of the burner. High temperature.
In that case, there is a limit to cooling by the cooling pipe section,
For this reason, in the burner chip formed of the above-mentioned metal material, the heat-resistant temperature is exceeded, and the function is deteriorated due to deformation of the burner chip.

[0005] An object of the present invention is to solve the above-mentioned problems, and even if a gas burner in which the tip of the burner tip is located on the upstream side of the tip of the second pipe portion is formed, the function of the burner tip can be improved. It is to provide a gas burner that is maintained.

[0006]

In order to achieve this object, the present invention is characterized in that a first pipe section for flowing fuel gas inside and discharging the fuel gas from a burner tip provided at a tip end thereof, and a first pipe section thereof. While surrounding the outer peripheral portion of the pipe portion, a second pipe portion that causes the oxygen-containing gas to flow inside the enclosed space and discharges from the tip portion, and is provided so as to surround the outer peripheral portion of the second pipe portion, And in a gas burner provided with a cooling pipe part in which a forward path and a return path of a cooling medium are formed, while arranging a first pipe part such that a tip of the burner tip is located upstream of a tip of the second pipe part, The burner chip is formed of a ceramic material.

In the above construction, various ceramic materials having heat resistance can be used as the ceramic material forming the burner chip. However, the burner chip is formed of an alumina-based, mullite-based, or zirconia-based ceramic material. Is more preferable than the operation and effect described below.
Here, the alumina-based, mullite-based, or zirconia-based ceramic material refers to a ceramic material containing alumina, mullite, or zirconia as a main component. At this time, it is more preferable that the purity of the alumina-based, mullite-based, or zirconia-based ceramic material is 60% or more, that is, high-purity alumina, high-purity mullite, or high-purity zirconia, from the following effects.

Further, it is preferable that the burner tip is formed so as to be thin from the tip to the body of the burner tip, from the viewpoint of the operation and effect described later.

According to a feature of the present invention, since the burner tip is formed of a ceramic material having higher heat resistance than a metal material, the tip of the burner tip is formed of the second pipe portion. By arranging the first pipe portion so as to be on the upstream side from the tip, even if the temperature of the burner chip becomes high, its function does not deteriorate. As a result, even if a gas burner in which the tip of the burner tip is located upstream of the tip of the second pipe portion is formed, a gas burner in which the function of the burner tip is maintained well can be provided.

When the burner chip is formed of an alumina, mullite or zirconia ceramic material, the alumina, mullite or zirconia ceramic material has a high melting point and a high heat resistance. Because it is high, high in strength, excellent in thermal shock resistance, and more advantageous in terms of cost than other heat resistant ceramic materials,
The function of the burner chip can be better maintained. When the alumina, mullite, or zirconia ceramic material has a purity of 60% or more, the heat resistance, strength, and thermal shock resistance are more excellent.

On the other hand, when the burner tip is formed so as to be thin from the tip to the body, the thermal stress generated inside the material can be reduced, so that the thermal shock resistance is more excellent.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the gas burner of the present invention has a first pipe portion 1 that allows fuel gas to flow inside and discharges from a burner chip 4 provided at a distal end portion, and an outer periphery of the first pipe portion 1. The oxygen-containing gas flows inside the enclosed space and is discharged from the tip side while surrounding the portion.
It comprises a pipe section 2 and a cooling pipe section 3 provided so as to surround an outer peripheral portion of the second pipe section 2 and formed with a forward path 3a and a return path 3b of a cooling medium.

The first tube 1 is arranged so that the tip of the burner chip 4 is located upstream of the tip of the second tube 2, but the spacer 4c is in contact with the inner wall surface of the second tube 2. As a result, the burner chip 4 is fixed and supported inside the second pipe portion 2. And the spacer 4c is the second pipe portion 2
The position relationship between the tip of the burner tip 4 and the tip of the second pipe part 2 can be changed by the position adjusting mechanism 1d in a state of contacting the inner wall surface of the burner tip. As a result, the shape of the flame can be adjusted, the burner tip 4 can be prevented from vibrating at the time of combustion, and the spacer 4c can be swirled so as to give a swirling flow to the flow of the oxygen-containing gas. You may comprise a blade. The burner chip 4
Is connected to the first pipe body 1c via the joint 1a, and has a structure in which fuel gas flowing inside the first pipe body 1c can be discharged from the opening 4a of the burner chip 4.

Although the burner chip 4 is made of a ceramic material, various ceramic materials having heat resistance can be used as the ceramic material.
In addition to mullite or zirconia ceramic materials,
Silicon carbide, silicon nitride, sialon and the like can be mentioned.
However, as described above, the burner chip 4 is preferably formed of an alumina-based, mullite-based, or zirconia-based ceramic material, and the purity is more preferably 60% or more, and more preferably higher.

On the other hand, a material such as copper having high thermal conductivity is used for the second tube portion 2, and the same material is used for the outermost tube of the cooling tube portion 3. Further, the cooling pipe section 3 is constituted by a double pipe provided so as to surround the outer peripheral portion of the second pipe section 2, and the outward passage 3 a of the cooling medium is formed inside, but the reverse is true. Alternatively, a partition may be provided inside one pipe to form the forward path 3a and the return path 3b. The cooling pipe section 3
A mounting flange 5 is provided on the outer periphery of the.

A flange 1b for connecting a fuel gas supply line to the first pipe 1 is provided in the second pipe 2
Is provided with a flange 2b for connecting a line for supplying an oxygen-containing gas, and the cooling pipe section 3 is provided with a supply port 3c for supplying a cooling medium and a discharge port 3d for discharging the cooling medium. LPG and LN are used as fuel gas.
A flammable gas such as G is used. As the oxygen-containing gas,
Oxygen, oxygen-enriched air, air or the like is used, and water or the like is used as a cooling medium.

Next, the operation of the gas burner of the present invention will be described. The cooling water is supplied from the supply port 3c and the discharge port 3
d, the oxygen-containing gas is supplied from the supply line connected to the flange 2b while supplying the fuel gas from the supply line connected to the flange 1b and discharging the fuel gas from the burner tip 4 provided at the tip of the first pipe portion 1. May be supplied and discharged from the gap between the second pipe portion 2 and the burner chip 4 to form a flame by ignition. At this time, the positional relationship between the tip of the burner tip 4 and the tip of the second pipe 2 is determined by the first existing
The shape of the flame can be adjusted by changing the position by the position adjusting mechanism 1d of the tube portion 1.

The gas burner of the present invention may be used as a tuyere of a waste melting furnace, a burner for supporting an incinerator, a burner as a tuyere of a cupola (hot metal furnace), and the like.

[Another Embodiment] Another embodiment will be described below with reference to the drawings.

<1> In the above embodiment, an example was shown in which the burner tip was not particularly thinned, but as shown in FIG. 3, the thickness from the tip of the burner tip 4 to the body 4b was reduced. Forming is preferred for the reasons described above. In that case, the thickness from the tip to the trunk 4b is 3 mm
The following is preferable, and 1-2 mm is more preferable. Here, the connecting portion 4d and the portion from the tip to the body 4b may be formed separately. In this case, in order to facilitate manufacture, the portion from the tip to the body 4b is formed of a ceramic material, and the connecting portion 4d is formed.
The spacer and the spacer 4c may be formed of a heat-resistant metal material. <2> In the above embodiment, the spacer 4c is configured to contact the inner wall surface of the second pipe portion 2 in a plane.
The contact surface of c may be formed in an uneven shape (a plurality of ridges are juxtaposed, for example) and the vibration may be absorbed by the elastic force of the metal side.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a gas burner.

FIG. 2 is an enlarged view of a main part of an example of an embodiment of a gas burner, (a) is a longitudinal sectional view, and (b) is a side view.

FIG. 3 is an enlarged view of a main part of a gas burner according to another embodiment;
(A) is a longitudinal sectional view, (b) is a side view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st pipe part 2 2nd pipe part 3 Cooling pipe part 3a Outgoing path of a cooling medium 3b Return path of a cooling medium 4 Burner chip

Claims (3)

[Claims] 1. A first pipe section (1) for allowing fuel gas to flow inside and discharging from a burner tip (4) provided at a tip end.
And a second pipe part (2) for surrounding the outer peripheral part of the first pipe part (1) and flowing an oxygen-containing gas inside the enclosed space and discharging the gas from the distal end side, and the second pipe part A gas burner provided surrounding the outer peripheral portion of the portion (2) and having a cooling pipe portion (3) formed with a forward path (3a) and a return path (3b) for a cooling medium, wherein the burner chip ( A gas burner in which the first pipe portion (1) is arranged so that the tip of 4) is located on the upstream side of the tip of the second pipe portion (2), and the burner chip (4) is formed of a ceramic material. 2. The burner chip (4) is made of an alumina-based material.
The gas burner according to claim 1, wherein the gas burner is formed of a mullite-based or zirconia-based ceramic material. 3. The gas burner according to claim 2, wherein the alumina, mullite, or zirconia ceramic material has a purity of 60% or more.