JP2004003689A - Burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer simple construction for preventing the burnout of a framework on a burner plate side of a burner or back fire into the burner and facilitating the maintenance and management of the burner. <P>SOLUTION: The burner 10 comprises: a burner body 3 formed into a boxed shape closed at one side and opening at one end by joining the framework 2 consisting of side plates 2a-2c to the periphery of a rectangular main plate 1; the meshed burner plate 5 mounted at the opening end of the burner body 3; a straightening vane 6 mounted at a position near the opening end in an internal space 7 of the burner body 3; and a fuel deflecting plate 11 provided between the straightening vane 6 and the main plate 1 in the internal space 7. Mixed gas fed from a fuel supply pipe 4 to a fuel introduction space 20 is blown from a vent hole 21 of a surrounding plate 11b of the fuel deflecting plate 11 to an inner periphery wall 3a of the burner body 3 for cooling the framework 2 of the burner body 3 during passing through an circular slit 19 and then blown from the burner plate 5 to the outside and burnt after passing through the straightening vane 6. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a burner suitable for heating a large flat surface or a curved surface of a surface to be heated, such as preheating a surface of a material in a process of transferring a plate material such as a steel plate to a product manufacturing process.
[0002]
[Prior art]
Conventionally, as a burner for heating such a large heated surface, a frame plate 2 (both side plates 2a, 2b and end plates 2c, 2d) is provided around a main plate 1 which is rectangular as viewed in the direction of arrow A as shown in FIG. A burner body 3 having a box shape, which is formed by being connected to one end (upper end in FIG. 6) and closed at the other end (lower end), is provided with a fuel supply pipe 4 at a closed end of the burner body 3. A combustion plate 5 and a rectifying plate 6 are attached to the open end and inside thereof, respectively, and a space is provided between the main plate 1 and the rectifying plate 6 at an inlet of the fuel supply pipe 4 to the internal space 7. The main plate 1 is provided with a fuel deflecting plate 8 which is opposed to the opening, and a mixed gas of fuel gas and air fed from the fuel supply pipe 4 is diffused around the fuel deflecting plate 8 and then rectified. The gas is rectified through the plate 6 and is ejected to the outside of the burner main body 3 from the ventilation hole of the combustion plate 5. Ignited by a spark of unillustrated spark plug, there is known a burner 9 which is to be burned.
[0003]
[Problems to be solved by the invention]
In the burner 9, the heated gas which is made substantially parallel to the combustion plate 5 in front of the combustion plate 5 by the combustion gas generated by burning the mixed gas in front of the combustion plate 5 (downward in FIG. 6). The material is heated. Conversely, the edge of the frame plate 2 at the opening side of the burner main body 3 is overheated to a high temperature by reflection heat or radiant heat from the heated material to be heated, and deformed and cracked. In addition, the mixed gas in the internal space 7 of the burner 9 is ignited (reverse ignited) by the reflected heat or the radiant heat, and the mixed gas is scattered on the front surface (surface) of the combustion plate 5. There is a risk of not burning properly.
Therefore, by arranging a cooling water pipe around the outer periphery of the frame plate 2 of the burner main body 3 or providing a cooling water jacket or an air cooling chamber and flowing cooling water and cooling air through them, at least the front end portion of the frame plate 2 is formed. Cooling around has been done.
However, in this case, the structure of the burner main body 3 becomes complicated, and a facility for supplying cooling water and cooling air to the burner 9 is required, which not only increases the manufacturing cost but also increases the cost of the facility including the burner 9. There is a problem that maintenance and management take time.
[0004]
The present invention has been made in view of the above circumstances, and reliably cools the periphery of a frame plate on a combustion plate side of a burner main body by a simple structure, thereby reducing the temperature of a material to be heated which is heated by combustion gas of a burner. It is an object of the present invention to provide a burner which can prevent the frame plate from being burned out by reflected heat and reverse ignition into the burner, and can be easily maintained and managed.
[0005]
[Means for Solving the Problems]
The present invention has the following features to solve the above problems.
That is, the burner according to claim 1 has a box-shaped burner body having one end closed and the other end open, and a fuel supply pipe for introducing gaseous fuel into the closed end. A predetermined distance is provided between the combustion plate attached to the open end of the burner main body, the inlet of the fuel supply pipe to the burner main body, and the inner end wall of the burner main body. And a fuel deflector provided on the inner peripheral wall of the burner main body along an inner end wall surface of a closed end of the burner main body. An annular slit extending along the entire circumference of the inner peripheral wall and communicating the fuel supply pipe with the opening side of the burner main body and being supported by the burner main body. I have.
[0006]
The burner according to claim 2 is the burner according to claim 1, wherein the fuel deflector is disposed along an outer peripheral portion of the burner, and the fuel deflector and the inner end wall surface of the closed end of the burner body are arranged. A peripheral plate connected to the fuel supply pipe together with the inner end wall surface and the fuel deflection plate to form a fuel introduction space, the peripheral plate communicating with the fuel introduction space and the slit over the entire circumference thereof; A plurality of vent holes are provided.
[0007]
The burner according to claim 3 is the burner according to claim 1, wherein the fuel deflector is disposed along an outer peripheral portion of the burner, and connects the fuel deflector to an open end of the burner main body. A peripheral plate that forms an annular fuel flow space connected to the slit between the inner peripheral wall of the burner main body and the peripheral plate, the fuel flow space and the open end side of the burner main body extending over the entire circumference thereof; And a plurality of vent holes communicating with each other.
[0008]
A burner according to a fourth aspect is the burner according to any one of the first to third aspects, wherein a plurality of ventilation holes are provided between the fuel deflector and the combustion plate at predetermined intervals. The straightening plate is provided so as to be supported by the burner body.
[0009]
A burner according to a fifth aspect is characterized in that, in the burner according to any one of the first to fourth aspects, a heat insulating material is attached to an outer periphery of the burner main body.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a burner according to an embodiment of the present invention will be described with reference to FIGS. The same or similar components as those of the conventional burner will be described with the same reference numerals.
1 to 3 show a burner 10 according to a first embodiment of the present invention. The burner 10 includes a frame plate including left and right (left and right in FIGS. 1 and 2) side plates 2a and 2b and front and rear (up and down in FIG. 1) side plates 2c and 2d around a rectangular main plate 1 in plan view. 2 and a box-shaped burner body 3 having one end (the upper end in FIG. 2) closed and the other end (the lower end in FIG. 2) opened, and a heat-resistant metal wire formed into a net shape. The burner body 3 has a combustion plate 5 attached to the open end of the burner body 3 in parallel with the main plate 1 and a large number of air holes throughout the plane area, and is closer to the open end in the internal space 7 of the burner body 3. And a rectifying plate 6 which is spaced apart from and parallel to the combustion plate 5, and a fuel which is located between the rectifying plate 6 and the main plate 1 in the internal space 7 and is spaced apart therefrom. And a deflection plate 11.
[0011]
A fuel supply pipe 4 having a flange 4 a at an end thereof is fixedly provided on the main plate 1 serving as a closed end of the burner main body 3 so as to communicate with an internal space 7 of the burner main body 3. A pair of connecting plates 12, 12 having burner connecting holes 12a at front and rear portions (upper and lower portions in FIG. 1) are fixed to an outer surface (upper surface) of the main plate 1 of the burner main body 3, and left and right end portions. A pair of mounting plates 13, 13 having bolt holes 13 a at positions closer to each other extend along the longitudinal direction (vertical direction in FIG. 1) of the burner main body 3, and connect both front and rear ends to the mounting plates 13, 13. Fixed.
[0012]
A heat insulating material 14 having a predetermined thickness is attached to the outer surface of the main plate 1 of the burner main body 3, and the outside thereof is covered with a holding plate 15 fixed to a portion of the frame plate 2 protruding outside the main plate 1. Has been done. On the outer peripheral portion of the frame plate 2, a plurality of heat insulator plates 16 of a predetermined length having substantially the same thickness as the heat insulating material 14 and substantially the same width as the height of the frame plate 2 are arranged without gaps. It is provided. Each of the heat insulating material plates 16 supports a support plate 17 having a U-shaped cross section mounted on the outside thereof on bolts 18 provided to protrude outside the frame plate 2 and tightens them with double nuts 18a to form side plates 2a to 2d. Fixed to.
[0013]
The fuel deflecting plate 11 extends substantially in the entire inner space 7 of the burner main body 3 along the inner wall surface 1a of the main plate 1 of the burner main body 3, and its outer peripheral portion is in contact with the inner peripheral wall 3a of the burner main body 3. A rectangular deflecting plate member 11a forming a rectangular annular slit 19 along the entire inner peripheral wall 3a, and a rectangular annular member disposed along the outer peripheral portion of the deflecting plate member 11a; A peripheral plate 11b for connecting the deflection plate member 11a to an inner end wall surface of the main plate 1; and forming a fuel introduction space 20 connected to the fuel supply pipe 4 between the deflection plate member 11a and the inner end wall surface 1a of the main plate 1. ing. The peripheral plate 11b is provided with a large number of ventilation holes 21 penetrating at the lower end side near the deflection plate 11a over the entire periphery thereof, and the fuel introduction space 20 and the slit 19 are formed through the ventilation holes 21. Communicating. The ventilation hole 21 may be a circular hole, a slit-shaped hole, or another appropriately shaped hole.
Although not shown, a spark plug for igniting the fuel injected from the burner 10 is provided on the burner main body 3 or other appropriate support portion with its tip facing forward of the open end of the burner main body 3. Is provided.
[0014]
When the burner 10 having the above configuration is installed in a required heating device and used, the mounting plates 13 fixed to the burner main body 3 are fixed to the required position of the heating device by bolts inserted into the bolt holes 13a. , The burner 10 is attached to the heating device. When the heating device is operated, a mixed gas (gas fuel) obtained by mixing fuel gas and air is supplied from the fuel supply pipe 4 of the burner 10 to the fuel introduction space 20 of the burner main body 3 by a blower or the like. The mixed gas entering the fuel introduction space 20 passes through the vent hole 21 of the peripheral plate 11b of the fuel deflection plate 11, and the annular space 3b between the inner peripheral wall 3a of the side plates 2a to 2d of the burner main body 3 and the peripheral plate 11b. After reaching the gap between the deflecting plate member 11a and the rectifying plate 6 through the slit 19, the rectifying plate 6 spreads and rectifies the entire area of the opening of the burner body 3, and then the combustion plate 5 The fuel is injected from the open end of the burner body 3 to the front thereof, and is ignited and burned by the ignition burner.
[0015]
The material to be heated such as a steel plate moving against the front surface of the combustion plate 5 of the burner 10 is heated by the high-temperature combustion gas resulting from the combustion of the mixed gas. At that time, in the burner 10, the end (the end on the combustion plate 5 side) of the frame plate 2 of the burner main body 3 itself is heated by the reflected heat or the radiant heat from the heated material to be heated. Since the mixed gas from the fuel introduction space 20 passes through the vent hole 21 at a high flow rate and hits the inner peripheral wall 3a of the burner body 3, the impinging jet cools the frame plate 2 rapidly, so that the frame plate 2 is heated to a high temperature. In addition, since the frame plate 2 is cooled by the mixed gas, the temperature of the mixed gas flowing inside the combustion plate 5 of the burner main body 3 is prevented from becoming high.
[0016]
As described above, according to the burner 10 according to the embodiment, the mixed gas fed into the burner main body 3 has a high flow rate toward the inner peripheral wall 3 a of the burner main body 3 through the vent hole 21 of the fuel deflection plate 11. While rapidly cooling the inner peripheral wall 3a by the heat transfer by the impinging jet, and further along the inner peripheral wall 3a from the slit 19 between the outer peripheral portion of the fuel deflector 11 and the inner peripheral wall 3a. Flow to the opening side of the burner main body 3, the front end of the frame plate 2 of the burner main body 3 is cooled well by the mixed gas, and the reflected heat or radiant heat from the material to be heated heated by the burner 10 causes The front end of the frame plate 2 of the burner main body 3 is prevented from being overheated and deformed and cracked due to overheating, and the mixed gas flowing in the opening side of the burner main body 3 becomes high in temperature and reverse ignition occurs, Ba It can be normally combustion actuating the Na 10 in front of the combustion plate 5.
[0017]
In addition, since the combustion gas of the burner 10 is caused to flow toward the inner peripheral wall 3a of the burner main body 3 by the fuel deflection plate 11, the frame plate 2 of the burner main body 3 can be cooled. Thus, a piping structure and equipment for supplying cooling water and cooling air to the outer periphery of the end portion of the frame plate 2 of the burner main body 3 are not required, and the burner is simple in structure, can be manufactured at low cost, and is easy to maintain. Can be realized.
[0018]
In the burner 10, the size of the heating area is determined by the size of the opening of the burner body 3. If the heating area needs to be further increased, for example, the burner body 3 in the burner 10 may be used. A plurality of the unit units are arranged in series in the longitudinal direction, and the connecting plates 12 and 12 of the burner main body 3 of adjacent unit units are connected to each other by omitting the front and rear side plates 2c and 2d as one unit unit. Then, nuts are screwed and connected to the bolts passing through the bolt holes 12a provided in them. Thereby, the burner can enlarge the heating area in the length direction. In this case, it is a matter of course that the outermost unit unit is provided with side plates 2c and 2d before and after the frame plate 2 of the burner main body 3.
[0019]
Next, FIG. 4 shows a burner 10A according to a second embodiment of the present invention.
In the burner 10A according to this embodiment, the peripheral plate 11b of the fuel deflection plate 11 in the burner 10 according to the embodiment is omitted, and a portion near the outer periphery of the deflection plate member 11a is appropriately formed along the outer periphery. A fuel deflection plate 11A is provided which is supported on the inner end wall 1a of the main plate 1 of the burner main body 3 by a plurality of support pieces 11c arranged at intervals. Other configurations are the same as those of the burner 10 according to the above-described embodiment, and therefore, the same portions are denoted by the same reference numerals and description of the configuration will be omitted.
Also in the burner 10A according to this embodiment, similarly to the burner 10 according to the embodiment, the frame plate 2 of the burner main body 3 can be effectively cooled by the mixed gas flowing through the slit 19 at a high flow rate. Therefore, deformation and cracking of the front end of the frame plate 2 and reverse ignition inside the burner main body 3 can be prevented, and the structure of the fuel deflection plate 11A is simple, so that it can be manufactured at lower cost and maintenance is easier. Burner can be realized.
In the burner 10A according to this embodiment, the peripheral plate 11f is fixed to the main plate 1 along the entire outer peripheral portion of the deflecting plate portion 11a, and the lower end of the peripheral plate 11f and the upper surface of the deflecting plate member 11a. In this configuration, the mixed gas fed into the fuel introduction space 20 is impinged and jetted onto the inner peripheral wall 3a of the burner body 3 through the slit 21a, so that the cooling effect of the frame plate 2 is reduced. It is increased, and the same operation and effect as the burner 10 according to the first embodiment can be obtained.
[0020]
FIG. 5 shows a burner 10B according to a third embodiment of the present invention.
In the burner 10B according to this embodiment, the burner 10 according to the embodiment has a configuration in which the fuel deflecting plate 11 has its peripheral plate 11b provided above the deflecting plate member 11a. The fuel deflecting plate 11B has a configuration in which the peripheral plate 11d is provided to extend to the open end of the burner main body 3 below the deflecting plate portion 11a. The front end side of the frame plate 2 of the burner main body 3 is bent toward the internal space 7 side of the burner main body 3 just before reaching the opening end, and the bent portion 2e is joined to the outer surface of the peripheral plate 11d. A rectangular annular space (fuel flow space) 22 is formed between the surrounding plate 11d and the frame plate 2, and the annular space 22 is formed between the surrounding plate 11d and the deflecting plate member 11a by a ventilation hole 21 formed in the surrounding plate 11d. It is communicated with the space between the current plate 6. The front end of the peripheral plate 11d also serves as the front end of the frame plate 2 of the burner main body 3, and the combustion plate 5 is fixed to the front end of the peripheral plate 11d. Further, the deflection plate member 11 of this embodiment is supported on the main plate 1 of the burner main body 3 by a support piece 11c similarly to the deflection plate member 11a of the burner 10A according to the second embodiment.
[0021]
The other configuration is the same as that of the burner 10 according to the above-described embodiment. Therefore, the same components are denoted by the same reference numerals, and the description of the configuration will be omitted.
Also in the burner 10B according to this embodiment, the mixed gas sent into the burner main body 3 from the fuel supply pipe 4 and sent to the inner peripheral wall 3a side of the burner main body 3 by the deflection plate member 11a of the fuel deflection plate 11B. Flows through the annular space 22, the frame plate 2 of the burner main body 3 can be efficiently cooled, and the same operations and effects as those of the burners 10 and 10A according to the above-described embodiments can be obtained.
[0022]
In the burners 10, 10A, and 10B according to the respective embodiments, the combustion plate 5 is formed in a planar shape in the cross-sectional structure shown in FIGS. 3 is formed in a box shape having a rectangular internal space 7, but the cross-sectional shape of the burner main body 3 is not limited to this, and the combustion plate is formed in an arc shape or another shape, and in accordance with this. It may be formed in a box shape having a space of an arc shape or another shape as a whole. This makes it possible to preheat the outer peripheral surface of the roller for transferring the steel plate or the like, and to effectively heat the surface of a member having a circular or other surface.
The burners 10, 10A and 10B according to the above embodiments are examples in which the present invention is applied to a premixed burner, but the present invention is not limited to this, and is applied to a non-premixed burner. You can also.
[0023]
【The invention's effect】
As described above, according to the present invention, the following excellent effects can be obtained.
According to the burner according to claim 1, the gaseous fuel fed into the burner main body flows toward the inner peripheral wall side of the burner main body by the fuel deflector, and further, the outer peripheral portion of the fuel deflector and the burner main body. Since the gas flows from the slit between the inner peripheral wall and the inner peripheral wall of the burner main body to the opening side thereof, the gaseous fuel flows through the opening end side of the burner main body, and the material to be heated is heated by the burner. Due to the reflected heat or radiated heat from the burner body, it is possible to prevent the opening end side of the burner main body from being heated to a high temperature, thereby preventing the burner main body from being deformed or cracked, or preventing the gas fuel in the burner main body from becoming high in temperature and causing reverse ignition.
In addition, since the fuel for combustion of the burner is caused to flow to the inner peripheral wall of the burner main body by the fuel deflection plate, the open end side of the burner main body can be cooled. A structure and equipment for supplying cooling water and cooling air to the outer periphery of the burner are not required, and a burner that is simple in structure, can be manufactured at low cost, and is easily maintained and managed can be realized.
[0024]
According to the burner according to the second aspect, the fuel is supplied from the fuel supply pipe to the fuel introduction space formed by the fuel deflection plate, the peripheral plate disposed along the outer peripheral portion thereof, and the inner wall surface of the closed end of the burner body. The injected gaseous fuel can be injected at a high flow rate from the through hole of the peripheral plate toward the frame plate of the burner main body. Deformation and cracks can be effectively prevented.
[0025]
According to the burner of the third aspect, the fuel flow space is formed toward the opening side of the burner by the peripheral plate over the entire inner periphery of the burner main body. The frame plate can be cooled efficiently.
[0026]
According to the burner according to the fourth aspect, since the rectifying plate having a plurality of ventilation holes is provided between the fuel deflecting plate and the combustion plate in the burner main body, the current flows along the frame plate of the burner main body. The gaseous fuel that has worked to cool the frame plate can be spread over the entire opening of the burner and evenly injected from the entire combustion plate.
[0027]
According to the burner according to the fifth aspect, since the heat insulating material is attached to the outer periphery of the burner main body, high heat is not dissipated from the burner main body to the surroundings, and the burner is safe and the combustion efficiency of the burner is enhanced. be able to.
[Brief description of the drawings]
FIG. 1 is a plan view showing a burner according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II in FIG.
FIG. 3 is a view as viewed from an arrow B in FIG. 2;
FIG. 4 is a sectional view showing a burner according to a second embodiment of the present invention.
FIG. 5 is a sectional view showing a burner according to a third embodiment of the present invention.
FIG. 6 is a sectional view showing a conventional burner.
[Explanation of symbols]
Reference Signs List 1 Main plate 2 Frame plate 3 Burner main body 4 Fuel supply pipe 5 Combustion plate 6 Rectifier plate 7 Internal space 9, 10, 10A, 10B Burner 11, 11A, 11B Fuel deflecting plate 11a Deflective plate members 11b, 11d, 11f Peripheral plate 14, 16 Insulation material 19, 21a Slit 21 Vent hole 22 Annular space (fuel flow space)

Claims (5)

One end is closed and the other end is open, and a box-shaped burner main body provided with a fuel supply pipe for introducing gaseous fuel into the closed end is attached to the open end of the burner main body. A burner comprising: a combustion plate; and a fuel deflector plate provided inside the burner main body at a predetermined interval between the fuel supply pipe and an inner end wall surface of the burner main body, facing an inlet of the fuel supply pipe to the burner main body. At
The fuel deflector extends along substantially the entire inner wall surface of the burner main body along the inner end wall surface of the closed end of the burner main body, and has an outer peripheral portion between the inner peripheral wall and the inner peripheral wall of the burner main body. An ignition plug, wherein an annular slit is formed along the entire circumference and communicates with the fuel supply pipe and the opening side of the burner main body to be supported by the burner main body. The fuel deflection plate is disposed along an outer peripheral portion of the fuel supply pipe, and connects the fuel deflection plate to an inner end wall surface of a closed end of the burner main body. A peripheral plate forming a fuel introduction space connected to the fuel cell, and the peripheral plate is provided with a plurality of ventilation holes communicating with the fuel introduction space and the slit over the entire periphery thereof. 2. The burner according to 1. The fuel deflecting plate is disposed along an outer peripheral portion of the fuel deflecting plate, and connects the fuel deflecting plate to an open end of the burner main body. And a plurality of ventilation holes which communicate the fuel circulation space and the open end side of the burner main body over the entire circumference thereof. The burner according to claim 1. A rectifying plate having a plurality of ventilation holes is provided between the fuel deflecting plate and the combustion plate at a predetermined interval and supported by a burner main body. The burner according to any one of Items 1 to 3. The burner according to any one of claims 1 to 4, wherein a heat insulating material is attached to an outer periphery of the burner main body.

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