JP2000146114A - Mounting structure of burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a burner which facilitates the loading or unloading of the burner while enabling accurate mounting of the burner at a specified position. SOLUTION: A flange 20 with the diameter thereof larger than the inner diameter of a burner tile 30 is provided on the outer circumference of a burner 10 while a guide cylinder 21 on the same axis as that of the burner is protrusively arranged on the flange 20. The guide cylinder 21 is inserted into the burner tile 30 and the burner 10 is mounted on the burner tile 30 in a state where the flange 20 is kept in contact with an outer wall surface 31 of an opening part of the burner tile 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner mounting structure, and more particularly to a burner mounting structure provided on a furnace wall of a melting furnace or the like for securely mounting a burner in a predetermined state. Regarding the structure.

[0002]

2. Description of the Related Art Burners provided in various industrial furnaces such as melting furnaces and heating furnaces are:
Usually, a predetermined amount of the burner tip is inserted into a burner tile in which a heat insulating tile is adhered inside a cylindrical opening provided in a furnace wall. For this reason, it is difficult to replace the burner, and it is not possible to replace the burner.
The range of heat control was limited.

As one means for facilitating attachment and detachment of a burner, a burner fixing jig may be provided in advance on a burner tile. However, in this case, the burner tile is generally formed of a heat-resistant material containing silicon as a main component, and the jig is generally formed of metal. The tile may be cracked, or the axis of the flame may deviate from the axis of the burner tile, and the flame may hit the burner tile and damage the burner tile.

[0004] Also, due to the difference in the coefficient of thermal expansion, the clearance between the inner surface of the burner tile and the outer surface of the burner increases,
From this, inconveniences such as the intrusion of outside air to disturb the flame and an increase in the generation of NOX occur. Further, there is a problem that a jig must be simultaneously constructed when the burner tile is constructed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a burner mounting structure capable of securely mounting a burner at a predetermined position and easily attaching and detaching the burner.

[0006]

In order to achieve the above object, a burner mounting structure according to the present invention is provided by inserting a burner tip into a cylindrical burner tile provided in a burner mounting portion such as a furnace wall. A structure for mounting, at a predetermined position on the outer periphery of the burner, a flange having a diameter larger than the inner diameter of the burner tile is provided, and on the burner tip side surface of the flange, an outer diameter corresponding to the inner diameter of the burner tile, and A guide tube having the same axis as the burner axis is protruded, and the guide tube is inserted into the burner tile, and the burner is attached to the burner tile with the flange abutting on the outer wall surface of the burner tile. It is characterized by.

[0007] Further, the burner mounting structure of the present invention comprises:
In the above configuration, the clearance between the outer peripheral surface of the guide cylinder and the inner peripheral surface of the burner tile is one of the outer diameter of the guide cylinder.
-5%. Also,
The flange is formed so as to be fixable at an arbitrary position on the outer periphery of the burner. Further, the burner is supported by a burner support on the rear side from the flange installation portion of the burner, and the burner support is formed so as to be movable in the axial direction of the burner, and in addition, the burner support is It is characterized in that it is formed so as to be movable in directions perpendicular to the axial direction of the burner and perpendicular to each other.

In particular, according to the present invention, the burner is supported by a burner support on the rear side from the flange installation portion of the burner, and the burner support is moved in the axial direction by a guide rail installed in a direction parallel to the axis of the burner. Provided as possible and fixable at any position, the burner support,
A first position adjusting means for moving the burner in parallel in the horizontal direction and a second position adjusting means for moving the burner in parallel in the vertical direction are provided.

[0009]

1 and 2 show an embodiment of a mounting structure of a burner according to the present invention. FIG. 1 is a front view showing a state in which the burner is mounted on a burner tile, and FIG. 2 is a burner. FIG. 3 is a side view as viewed from the rear side, and FIG. 3 is a cross-sectional view illustrating an example of a shape of a burner.

First, the structure of the burner used in this embodiment will be described with reference to FIG. This burner 10 is formed by a fuel pipe 12 having a fuel passage 11 at the center and a burner outer pipe 14 having a double pipe structure forming a combustion supporting gas passage 13 on the outer periphery of the fuel pipe 12. Outer tube 14
On one side of the base side, a combustible gas inflow portion 15 is provided, and a spacer block 17 is provided between the fuel tube insertion tube 16 holding the fuel tube 12 and the inner peripheral surface of the burner outer tube.

The fuel pipe 12 and the burner outer pipe 14 are connected to a fastener 18 provided on the outer surface of the joint of the fuel pipe 12 and the fuel pipe 12 inserted into the fuel pipe insertion tube 16 of the burner outer pipe 14.
Are fixed by engaging and tightening. By fixing the two with the fastener 18 in this manner, the two pipes 1 are fixed.
2, 14 can be prevented from rotating around the axis, and the pipe connected to the burner 10 can be prevented from being twisted. Moreover,
Since the fuel tube 12 can be easily fixed and released, the fuel tube 12 can be easily attached to and detached from the burner outer tube 14 even when the burner 10 is set in a furnace body or the like, and maintenance of the fuel tube 12 can be easily performed. it can.

Further, the rubbing surface 12 on the outer periphery of the fuel pipe 12
The outer diameter of each of the parts a, 12b, and 12c is large on the base side, and the fuel diameter depends on the dimensional accuracy of the rubbing part between the rubbing surfaces 12a, 12b, and 12c and the inner peripheral surface of the burner outer tube 14. The coaxiality between the tube 12 and the burner outer tube 14 is determined. By providing a plurality of rubbing surfaces having different diameters in this way, the accuracy of the coaxiality can be improved.
Further, the clearance between each of the rubbing surfaces 12a, 12b, and 12c and the inner peripheral surface of the burner outer tube 14 or the fuel tube insertion tube 16 tends to increase the temperature at the distal end portion during operation, and the thermal expansion at the distal end portion is reduced. Therefore, it is desirable that the clearance on the rubbing surface 12c at the distal end is set to about 1 mm, and the clearance at the rubbing surfaces 12a and 12b on the center and base sides is set to about 0.5 mm. That is, if the clearance at the distal end is too small, the fuel tube 12 may not come off due to thermal expansion. Conversely, if the clearance is too large, the coaxiality may be impaired.

A guide member 22 composed of a flange 20 and a guide cylinder 21 is mounted on the burner 10 thus formed at a predetermined position on the outer periphery of the distal end side of the burner outer tube 14. As shown in FIGS. 1 and 2, the flange 20 of the guide member 22 has a direction perpendicular to the axis of the burner 10, that is, the surface of the flange 20 on the burner tip side is the outer wall surface 31 of the opening of the burner tile 30. Is provided so as to abut the outer diameter of the
The inner diameter of the burner tile 30 is larger than, for example, 20% of the inner diameter of the burner tile 30, and preferably more than that.

The inner diameter of the flange 20 is
It is formed to have the same or slightly larger diameter as the burner outer tube 14 so that it can be fixed at an arbitrary position at the leading end of the burner. After the flange 20 is set at an optimal position in relation to the burner 10 and the burner tile 30, the outer tube 1
4 may be fixed by welding or the like, and the burner 10 may be kept slidable in the axial direction. Further, the inner peripheral portion of the flange 20 may be formed in a cylindrical shape.

Further, the contact portion between the inner peripheral portion of the flange 20 and the outer peripheral surface of the burner outer tube 14 can be sealed with an appropriate sealing material as required. Also, the flange 20
A suitable sealing material can also be provided as necessary at the contact portion between the surface of the burner tip side and the outer wall surface 31 of the opening of the burner tile 30.

The guide cylinder 21 is formed by projecting a cylindrical body coaxial with the axis of the burner 10 from the surface on the burner tip side of the flange 20, and has an outer diameter such that it can be inserted into the burner tile 30. , Are formed slightly smaller in diameter than the inner diameter of the burner tile 30. The clearance between the outer peripheral surface of the guide cylinder 21 and the inner peripheral surface of the burner tile 30 takes into account thermal expansion due to temperature rise during the combustion operation, for example, the temperature of the guide cylinder 21 increases to 100 to 200 ° C. In the case of stainless steel, which is a general material of the burner 10, since elongation of about 0.7% occurs at 150 ° C., preferably, the unevenness of the inner peripheral surface of the burner tile is 1 to 2% of the outer diameter of the guide tube 21. Considering this, 5% of the outer diameter of the guide cylinder 21
It is preferable to set the following. If the clearance is too large, it is difficult to set the burner 10 at a predetermined position in the burner tile 30, and if it is too small, the burner tile 30 may be damaged by thermal expansion.
The length of the guide cylinder 21 is arbitrary, but is usually several c.
m is appropriate.

The axial position at which the guide member 22 is mounted can be arbitrarily set according to the state of the flame from the burner 10, and the diameter of the burner 10 and the burner tile 3
What is necessary is just to select according to the diameter and length of 0.

The burner 10 with the guide member 22 mounted thereon is set on the burner tile 30 with the burner outer tube 14 behind the mounting portion of the guide member 22 supported by the burner support 40. Burner support 40
Is a holding member 41 for holding the burner 10, a vertical position adjusting means 42 capable of adjusting a vertical (vertical) position of the holding member 41, and a left and right (horizontal) of the vertical position adjusting means 42.
The burner 10 is provided with a pair of guide rails 44 provided in parallel with the axial direction of the burner 10.

The holding means 41 is formed so as to hold the outer tube 14 of the burner by tightening a pair of half-shaped members with tightening bolts 41a so that the burner 10 with the guide member 22 mounted thereon can be attached and detached. Have been. The vertical position adjusting means 42 includes a screw rod 42a and a double nut 42b.
By loosening and turning b, the screw rod 42a moves up and down, and the burner 10 moves up and down via the holding means 41. The left and right position adjusting means 43 includes a dovetail groove member 43a, a slide member 43b, and a lock bolt 43c. The slide member 43b is slid with respect to the dovetail groove member 43a to thereby adjust the vertical position adjusting means 42 and the holding member. Burner 1 via means 41
0 can be moved in the left-right direction, and the position can be fixed by tightening the lock bolt 43c. The left and right position adjusting means 43 is provided with the groove member 4.
3a is slidably engaged with the guide rail 44, and lock bolts 44a for fixing the position are provided at both ends of the dovetail groove member 43a.

When attaching the burner 10 to the burner tile 30, first, the guide member 22 is attached to a predetermined position of the burner 10, and the burner support 40 is held in a state of being retracted to the rear side of the guide rail 44. The burner 10 is held by the means 41, and the bolt 41a is tightened and fixed.

Next, the burner support 40 is slid in the direction of the burner tile 30 along the guide rail 44,
The guide cylinder 21 is positioned immediately near the opening of the burner tile 30. In this state, the position is adjusted so that the guide tube 21 can be inserted into the burner tile 30 by operating the vertical position adjusting means 42 and the horizontal position adjusting means 43. At this time, if the position adjustment is incomplete, the tip of the guide tube 21 hits the outer wall surface 31 of the opening of the burner tile 30 and cannot be inserted, so that the burner 10 is not attached without the position adjustment being incomplete.

After the position adjustment, the double nut 42b
After fixing the position in the up, down, left and right directions by tightening the lock bolt 43c, the burner support 40 is moved along the guide rail 44 until the surface of the flange 20 on the burner tip side comes into contact with the opening outer wall surface 31 of the burner tile 30. Let go forward. By tightening the lock bolt 44a in this state, the burner 10 can be fixed in a state where the burner 10 is inserted into the burner tile 30 at a predetermined position by a predetermined amount.

As described above, since the burner 10 can be attached to the burner tile 30 without any modification, it is possible to attach the burner 10 to an existing opening such as a furnace wall. This can be easily performed, and the setting of the burner tip position can be performed reliably. Therefore, the burner tile 30 is not damaged by the collision of the flame from the burner 10,
A stable combustion operation can be performed over a long period.

Further, since the outer wall surface 31 of the opening of the burner tile 30 is covered with the flange 20, it is possible to prevent the invasion of outside air, to obtain a stable combustion state, and to reduce the generation amount of NOX. be able to. Furthermore, even if the axes do not match due to thermal expansion, it can be easily readjusted.

Further, by opening the holding member 41 in this state, the burner 10 can be removed, so that replacement and maintenance of the burner 10 can be easily performed. Is fixed at a predetermined position, the burner 10 can be set at a predetermined position by causing the holding member 41 to hold the burner 10. At this time, the burner 10 can be removed more easily by moving the burner support 40 in the axial direction along the guide rail 44.
By keeping the left and right position adjusting means 43 fixed, the burner 10 can be easily and reliably remounted.

Further, by preparing the guide member 22 and the holding member 41 in correspondence with burners having different outer diameters, burners having different outer diameters can be easily attached, and the heat power can be adjusted widely. Can be.

The structure of the burner 10 is not limited to the above-described embodiment, but may be a liquid fuel such as heavy oil or kerosene, a solid fuel such as pulverized coal, or a gaseous fuel such as LPG or propane. In addition, it is possible to appropriately form an optimal structure in accordance with conditions such as whether the supporting gas is air, oxygen-enriched air, or oxygen.

In the above embodiment, the burner support 4
Although the vertical position adjusting means 42 and the left and right position adjusting means 43 are provided at 0, these adjusting means may be provided on the guide rail 44.

[0029]

As described above, according to the burner mounting structure of the present invention, the burner can be securely mounted at a predetermined position of the burner tile, and the burner tile may be damaged or the outside air may enter. Can also be prevented.
In addition, since the burner can be easily attached and detached, maintenance can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a mounting structure of a burner according to the present invention, showing a state where the burner is mounted on a burner tile.

FIG. 2 is a side view as seen from the rear side of the burner.

FIG. 3 is a sectional view showing an example of a shape of a burner.

[Explanation of symbols]

10 burner, 11 fuel passage, 12 fuel pipe, 13
... combustible gas passage, 14 ... burner outer tube, 18 ... fastener, 20 ... flange, 21 ... guide cylinder, 22 ... guide member, 30 ... burner tile, 31 ... opening outer wall surface, 4
0: burner support, 41: holding member, 42: vertical position adjusting means, 43: left and right position adjusting means, 44: guide rail

Claims (6)

[Claims] 1. A structure for inserting and attaching a burner tip into a cylindrical burner tile provided on a burner attachment portion such as a furnace wall.
A flange having a diameter larger than the inner diameter of the burner tile is provided, and a guide cylinder having an outer diameter corresponding to the inner diameter of the burner tile and projecting on the same axis as the burner axis is provided on the surface of the flange on the burner tip side. A burner mounting structure, wherein a guide tube is inserted into a burner tile and the burner is mounted on the burner tile in a state where the flange is in contact with an outer wall surface of the burner tile. 2. The clearance between the outer peripheral surface of the guide cylinder and the inner peripheral surface of the burner tile is 1 to 3 times the outer diameter of the guide cylinder.
The burner mounting structure according to claim 1, wherein the setting is set to 5%. 3. The burner mounting structure according to claim 1, wherein the flange is formed so as to be fixed at an arbitrary position on an outer periphery of the burner. 4. The burner according to claim 1, wherein a back side of the burner from a flange installation portion is supported by a burner support, and the burner support is formed to be movable in an axial direction of the burner. Mounting structure. 5. The mounting structure for a burner according to claim 4, wherein the burner support is formed so as to be movable in directions perpendicular to the axial direction of the burner and in directions perpendicular to each other. 6. A burner supporter supports a rear side of the burner flange from a flange installation portion, and the burner support body can be moved in an axial direction by a guide rail installed in a direction parallel to the burner axis, and can be arbitrarily moved. The burner support is provided so as to be fixable at a position, and the burner support is provided with first position adjusting means for horizontally moving the burner and second position adjusting means for vertically moving the burner in parallel. The burner mounting structure according to claim 1, wherein: