JP2014238210A - Rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary kiln which can easily perform gap adjustment even if a gap is generated at an installation face between a tire support material and a kiln external peripheral face by thermal deformation, and can stably support the tire support material without causing wobbling.SOLUTION: A tire support material 5 to be arranged at an external peripheral face of a kiln main body 4 is supported to the external peripheral face of the kiln main body in a free state without being firmly adhered by welding or with a bolt or the like, and on the other hand, bolt penetration holes are made to penetrate both-side legs of the tire support material 5, height adjusting bolts 22 of the tire support material 5 are made to penetrate the bolt penetration holes, bolt tips are made to appear and disappear from lower end openings of the bolt penetration holes according to fastening operations of the height adjusting bolts, and a height and a width of the tire support material 5 can be adjusted.

Description

  The present invention relates to a rotary kiln used for incineration of flammable waste, firing of inorganic materials, and the like.

  Conventionally, for example, a rotary kiln has been adopted when incineration of combustible waste such as waste wood and waste plastic, or baking of various inorganic materials. This type of rotary kiln is arranged at predetermined intervals along the circumferential direction of the kiln on the inner periphery of a cylindrical steel plate, on the outer periphery of a kiln main body formed by surrounding a heat-resistant caster such as refractory bricks and ceramics. A plurality of substantially saddle-shaped tire support members are fixed, and an annular steel tire is externally fitted on the outer periphery of the tire support member, while the tire is supported by a tire roller pivotally supported on a base. The kiln main body is configured to be tilted and supported so as to be rotatable.

  Further, both ends of the kiln main body are provided with hoods respectively, and the inlet hood which is a processed product supply side is provided with a burner for supplying hot air and processed product supply means such as a conveyor and a pusher, while the processed product discharge side The outlet hood is provided with a discharge hopper that discharges a processed product that has been incinerated or baked, an exhaust flue for exhaust gas derivation, and the like. The above configuration shows the case of a parallel flow type rotary kiln in which the flow direction of the treatment object and the hot air is the same in the kiln body, and the counter flow type rotary kiln in which the flow direction of the treatment object and the hot air is reversed. In some cases, the inlet hood is provided with a processed material supply means and an exhaust flue, while the outlet hood is provided with a burner and a discharge hopper.

  By the way, in such a rotary kiln, when the processed product is incinerated and fired at a high temperature, the steel plate on the surface of the kiln main body also has a considerably high temperature. Thermal stress due to the difference in coefficient of thermal expansion occurs in the tire support material, and there is a risk that distortion and cracks may occur in the welded part, bolt part, etc. while being repeatedly received. In particular, when incinerating waste, the incineration temperature must be raised to about 800 ° C. or more in order to prevent synthesis of dioxins, and the heat storage property of the caster itself on the inner surface of the kiln is very high. Since it is high and maintained at a high temperature for a long time, the thermal stress generated in the tire support material is also proportionally increased, and the risk of breakage is expected to increase accordingly.

  In response to such a problem, as shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-151382), the present applicant uses both ends of the tire support material for welding, bolts, etc. to the outer peripheral surface of the kiln body. The rotary kiln is configured so that it can be supported in a free state so as to allow thermal expansion without being fixed, and according to the invention, the surface of the kiln main body has a high temperature during incineration / firing treatment. Even if it becomes, it is hard to produce a thermal stress in a tire support material, and generation | occurrence | production of damage, such as a distortion and a crack, can be suppressed and it is set as the thing suitable in a maintenance surface.

JP 2010-151382 A

  However, in the above-mentioned conventional apparatus, both ends of the tire support material are not fixed to the outer peripheral surface of the kiln as a countermeasure against thermal stress, so both ends of the tire support material in a free state exposed to high temperature are used. However, depending on the degree of deformation, there is a gap in the installation surface between the tire support and the kiln outer peripheral surface. There was a possibility of causing problems such as.

  In view of the above points, the present invention can easily adjust the gap and stably support the tire support material without rattling even when a gap is generated on the installation surface between the tire support material and the kiln outer peripheral surface due to thermal deformation. It is an object to provide a rotary kiln that can be used.

  In order to solve the above-described problems, in the rotary kiln according to the present invention, a plurality of substantially saddle-shaped tire support materials are fixed to the outer peripheral surface of the kiln main body on the outer periphery of a cylindrical kiln main body that is rotatably supported to be inclined. In a rotary kiln that is arranged at predetermined intervals in the circumferential direction of the kiln and is fitted with an annular tire on the outer periphery of each tire support material, bolt insertion holes in the kiln radial direction are provided at both ends of the tire support material, respectively. Is inserted through the upper end opening of the bolt insertion hole, and the bolt for adjusting the height of the tire support material is inserted, and the bolt tip is inserted from the lower end opening of the bolt insertion hole according to the tightening operation of the height adjustment bolt. While the height of the tire support is adjustable, the lateral displacement that prevents the tire support from moving in the kiln circumferential direction on the outer peripheral surface of the kiln body around the tire support And locking piece is characterized in that fixed a vertical displacement preventing piece for preventing the movement displaced into the kiln axis.

  According to the rotary kiln according to the present invention, the tire support material is supported without being fixed to the outer peripheral surface of the kiln main body, while the both ends of the tire support material are respectively penetrated with bolt insertion holes, and the bolt insertion holes are provided with tire support. The height of the tire support can be adjusted by inserting the bolt for adjusting the height of the material and making the bolt tip protrude from the bottom opening of the bolt insertion hole according to the tightening operation of the bolt for adjusting the height. Even if there is a gap in the installation surface with the kiln body outer peripheral surface due to thermal deformation of both ends of the tire support material because it is not fixed to the outer peripheral surface of the kiln main body, the height is The clearance can be adjusted relatively easily by a very simple operation of tightening the adjusting bolt, and the tire support can be stably supported without rattling.

It is a partially cutaway explanatory view showing an embodiment of a rotary kiln according to the present invention. It is a principal part enlarged view of FIG. It is explanatory drawing explaining a mode that the clearance gap produced between the both-ends leg part of a tire support material and the kiln outer peripheral surface is adjusted.

  In the rotary kiln according to the present invention, a plurality of substantially saddle-shaped tire support members are arranged at predetermined intervals in the kiln circumferential direction on the outer periphery of the kiln body, and an annular tire is provided on the outer periphery of each tire support member. It is fitted outside. Further, both the leg portions of the tire support material and the kiln outer peripheral surface are supported in a free state without being fixed by welding or bolts, and the kiln outer peripheral surface around the tire support material is supported in a free state. A lateral misalignment prevention piece that prevents the material from shifting in the kiln circumferential direction and a vertical misalignment prevention piece that prevents the material from shifting in the kiln axial direction are fixed to each other. Further, bolt insertion holes are penetrated in the kiln radial direction (the thickness direction of the tire support material) at both leg portions of the tire support material, respectively, and the height of the tire support material is adjusted from the upper end opening side of the bolt insertion hole. And the height of the tire support material can be adjusted by allowing the bolt tip to protrude from the bottom opening side of the bolt insertion hole according to the tightening operation of the height adjustment bolt. Yes.

  And when incinerating flammable waste such as waste wood and waste plastic in the rotary kiln, or when firing various inorganic materials, incineration / firing treatment is performed while maintaining the inside of the kiln in a high temperature atmosphere, As a result, the tire support material arranged on the outer peripheral surface of the kiln body is also exposed to a considerable high temperature and causes thermal expansion in the kiln axial direction and the circumferential direction. Therefore, the tire support material is not subjected to thermal stress, and there is no risk of damage such as distortion or cracks. At this time, even if the tire support material not fixed to the kiln outer peripheral surface shifts in the kiln circumferential direction or the axial direction with the rotation of the kiln or the like, the lateral deviation preventing piece fixed to the periphery thereof And the vertical displacement preventing piece is surely regulated and prevented, and the tire support member can be stably held without moving from a predetermined support position.

  On the other hand, both ends of the tire support material are not fixed to the outer peripheral surface of the kiln, so that both ends of the tire support material exposed to high temperatures warp in the kiln radial direction (upper side of the tire support material). If there is a gap in the installation surface between the tire support and the kiln outer peripheral surface, the worker must tighten the height adjustment bolts provided on the both ends of the tire support and tighten the end of each bolt. By projecting the part from the lower end opening side of the bolt insertion hole and bringing it into contact with the outer peripheral surface of the kiln, the tire support material and the outer peripheral surface of the kiln are brought into close contact with each other without any gaps and are firmly supported and fixed.

  In this way, the thermal stress on the tire support can be effectively suppressed by supporting the both ends of the tire support in a free state without being fixed to the outer peripheral surface of the kiln by welding or bolts. The occurrence of damage such as distortion and cracks can be prevented as much as possible, and both ends of the tire support material warp in the kiln radial direction (the upper surface side of the tire support material) by making it free without sticking. Even if there is a gap in the installation surface with the kiln outer peripheral surface due to thermal deformation, it is relatively easy to adjust the gap by simply tightening the height adjustment bolt provided on the tire support. Thus, the tire support material can be stably supported without rattling, which is preferable in terms of maintenance.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 in the figure is a co-current type rotary kiln used to incinerate combustible waste such as waste wood and waste plastic, or to calcinate various inorganic materials. A heat-resistant caster 3 such as refractory bricks or ceramics is provided around the inner peripheral surface to form a kiln main body 4, and the outer periphery near both ends thereof is shown in the drawing at predetermined intervals in the kiln circumferential direction. In addition, a plurality of substantially saddle-shaped tire support members 5 are arranged, and an annular steel tire 6 is fitted on the outer periphery of the tire support member 5 while being supported on a base 7. By supporting the tire 6 with the pair of tire rollers 8, the kiln main body 4 is rotatably supported at an appropriate angle (for example, about 2 degrees), and a drive device (not shown) Can be rotated at an appropriate speed with an inverter (not shown) It is.

  A hood is provided at the end of the kiln body 4, and an inlet hood 9 on the supply side of the various processed products R is provided with a burner 10 for supplying hot air, a pusher 11 as a processed product supply means, and a supply hopper 12. On the other hand, the outlet hood 13 on the treated product discharge side is provided with a discharge hopper 14 for discharging the treated product R ′ after incineration or firing, and an exhaust flue 15 for exhaust gas derivation. A chimney (not shown) is provided downstream of the road 15 via a heat exchanger (not shown), a dust collector (not shown), an exhaust fan (not shown), and the like. Further, similarly to the kiln main body 4, heat-resistant casters 3 are respectively attached to the inner peripheral surfaces of the inlet hood 9 and the outlet hood 13 to protect them from high-temperature hot air. The outlet hood 13 has a structure in which the high-temperature exhaust gas G derived from the kiln body 4 is led out to the exhaust flue 15 over about 2 seconds, during which unburned matter and dioxins in the exhaust gas G are derived. And so on.

  The inlet hood 9 and the outlet hood 13 are provided with annular sealing material fixing pieces 16 and 17 projecting along the outer peripheral surface of the kiln main body 4 penetrating into the inlet hood 9 and the outlet hood 13. For example, a base end portion of a metal seal plate 18 is fixed to the distal end portion of the seal plate 18 as a sealing material for preventing the entry of outside air, and the free end portion of the seal plate 18 is pressed against the outer peripheral surface of the kiln body 4. The clearance between the outer peripheral surface of the kiln main body 4 and the inlet hood 9 and the outlet hood 13 is sealed so as to suppress the intrusion of outside air as much as possible without obstructing the rotation of the kiln main body 4. Yes.

  The tire support 5 is fixed by welding and integrated with the tire 6 fitted on the outer peripheral side thereof, while it is not fixed to the steel plate 2 on the outer peripheral surface of the kiln by welding or bolts. While being supported in a free state, the tire support material 5 in a free state is displaced in the kiln circumferential direction (vertical direction in FIG. 2) on the steel plate 2 on the outer peripheral surface of the kiln around the tire support material 5. A lateral misalignment prevention piece 19 for restricting / preventing misalignment and a vertical misalignment prevention piece 20 for restricting / preventing displacement movement in the kiln axis direction (left-right direction in FIG. 2) are fixed to each other. In addition, as shown in the figure, the vertical misalignment prevention piece 20 is secured to only one of the left and right ends of the tire support member 5 and secures an extension when the tire support member 5 is thermally expanded on the other end side. On the other hand, the tire support members 5 are held at predetermined positions by being alternately (staggeredly) arranged at the left and right positions of the tire support members 5 adjacent to each other in the vertical direction.

  Further, the both ends of the tire support member 5 are respectively penetrated with bolt insertion holes 21 in the kiln radial direction (thickness direction of the tire support member 5), and the tire support is supported from the upper end opening side of the bolt insertion hole 21. A bolt 22 for adjusting the height of the material 5 is inserted, and the front end of the bolt is projected and retracted from the lower end opening of the bolt insertion hole 21 according to the tightening operation of the height adjusting bolt 22, thereby supporting the tire. The height width of the material 5 can be freely adjusted. For example, when the tire support 5 is thermally deformed and a gap is generated between the tire support 5 and the outer peripheral surface of the kiln, the height adjusting bolt 22 is tightened according to the gap width. Then, the height of the tire support member 5 is adjusted by making the bolt tip protrude from the lower end opening side of the bolt insertion hole 21 and come into contact with the steel plate 2 on the kiln outer peripheral surface. It can be firmly supported without any problems.

  Further, as shown in the figure, a flat plate 23 having substantially the same size as that of the tire support material 5 is sandwiched between the tire support material 5 and the steel plate 2 on the outer peripheral surface of the kiln. Even when the front end portion of the bolt 22 is protruded from the lower end opening side of the bolt insertion hole 21, the tire support member 5 can be stably supported by being supported via the flat plate 23 having a wider support area than the front end portion of the bolt. I try to be as possible. Reference numeral 24 in the figure denotes a drop-off prevention piece for preventing the flat plate 23 from falling off. The drop-off prevention piece 24 is a vertical slip prevention piece 20 fixed to one end of each tire support member 5 on the left and right sides. It is fixed at the opposite position, and as shown in the drawing, it is fixed at a slight interval from the end of the tire support member 5 in consideration of the stretch margin at the time of thermal expansion of the tire support member 5. If the tire support 5 can be supported sufficiently stably even at the tip of the height adjusting bolt 22, the flat plate 23 can be omitted.

  In the rotary kiln 1 configured as described above, for example, when combustible waste such as waste wood or waste plastic is incinerated or various inorganic materials are fired, first, the burner 10 is appropriately burned according to the above processing. In addition to operating with the amount, the driving device is adjusted with an inverter to rotate the kiln body 4 at an appropriate speed. In addition, the inclination angle and rotation speed of the kiln main body 4 are set to the time required for the processed material R to be completely incinerated and fired in the hot air atmosphere, for example, about 30 to 40 minutes for incineration. It may be adjusted so that it reaches the discharge hopper 14 by being hung.

  Then, the processed material R in the supply hopper 12 is sequentially sent to the kiln body 4 by the pusher 11 and supplied in the above operation state. The processed material R supplied into the kiln main body 4 gradually flows down in the kiln main body 4 in accordance with the inclination while being exposed to the high-temperature hot air from the burner 10, and incineration / firing treatment is performed in the meantime. Specifically, the processed product R ′ that has undergone the incineration / firing process is discharged to the discharge hopper 14 at the lower end of the outlet hood 13 and stored. On the other hand, the hot exhaust gas G passes through the kiln main body 4 from the inlet hood 9 and is then led to the exhaust flue 15 by taking about 2 seconds or more at the outlet hood 13, and is included in the exhaust gas G during this time. Unburnt components and dioxins are decomposed by combustion.

  At this time, the inside of the kiln main body 4 is maintained in a high temperature atmosphere for a long time, and the outer peripheral surface of the kiln main body 4 becomes considerably hot due to the radiant heat from the caster 3 having a high heat storage property. Since both end legs of the tire support 5 are not fixed by welding or bolts, but are held in a free state, the thermal stress on the tire support 5 can be effectively suppressed, and distortion and cracks It is possible to prevent the occurrence of breakage as much as possible.

  On the other hand, as shown in FIG. 3, both end legs of the tire support 5 are not fixed to the outer peripheral surface of the kiln (a), so that the both end legs exposed to high temperature are in the kiln radial direction (tire support 5 (B) when the tire support member 5 has undergone thermal deformation that warps toward the upper surface side, and a gap is formed on the installation surface between the tire support member 5 and the kiln outer peripheral surface (b), The pair of height adjusting bolts 22 provided for the bolts are respectively tightened, and the respective bolt front ends protrude from the lower end opening side of the bolt insertion holes 21 and are brought into contact with the steel plate 2 on the outer peripheral surface of the kiln through the flat plate 23. Thus, (c), the tire support 5 and the kiln outer peripheral surface are firmly supported and fixed without a gap.

  Thus, by supporting the both leg portions of the tire support material 5 in a free state without being fixed to the steel plate 2 on the outer peripheral surface of the kiln, it is possible to effectively suppress thermal stress and damage such as distortion and cracks. Can be prevented as much as possible, and since the both ends leg portions of the tire support material 5 are warped toward the upper surface side of the tire support material 5 due to the free state, there is a gap in the installation surface with the steel plate 2. In the case of the occurrence of a tire, the clearance adjustment can be performed relatively easily and in a short time by a very simple operation of tightening the bolt 22 for height adjustment, and the burden on the worker is reduced. It becomes possible to stably support without sticking.

DESCRIPTION OF SYMBOLS 1 ... Rotary kiln 4 ... Kiln main body 5 ... Tire support material 6 ... Tire 19 ... Side shift prevention piece 20 ... Vertical shift prevention piece 21 ... Bolt insertion hole 22 ... Bolt for height adjustment

Claims (1)

  A plurality of substantially saddle-shaped tire support members are arranged on the outer periphery of a cylindrical kiln main body that is rotatably and tiltably supported at predetermined intervals in the kiln circumferential direction without being fixed to the outer peripheral surface of the kiln main body. In a rotary kiln in which an annular tire is externally fitted on the outer periphery of the material, bolt insertion holes are penetrated in the kiln radial direction respectively at both end leg portions of the tire support material, and the tire support material is inserted from the upper end opening of the bolt insertion hole. The height of the tire support is adjustable by inserting the height adjustment bolt through the bolt and making the bolt tip protrude from the bottom opening of the bolt insertion hole according to the tightening operation of the height adjustment bolt. On the other hand, on the outer peripheral surface of the kiln body around the tire support material, there are a lateral shift prevention piece that prevents the tire support material from moving in the kiln circumferential direction and a vertical shift prevention piece that prevents the tire support material from moving in the kiln axial direction. Solid Rotary kiln, characterized in that it was.

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