JP6469995B2 - Rotary kiln - Google Patents

Description

  The present invention relates to a rotary kiln that heats an object to be processed such as a waste tire or industrial waste to perform a thermal decomposition process or a drying process.

  Conventionally, when recovering carbon black for tires by pyrolyzing waste tires, the waste tires are continuously processed against a batch furnace that processes a predetermined amount of waste tires once each time. Therefore, rotary kilns (rotary furnaces) that have high business efficiency are often used (see, for example, Patent Document 1).

JP 2001-311583 A

  In order to recover the carbon black for tires by pyrolyzing the waste tire, it is necessary to remove as much oil as possible from the rubber of the waste tire by pyrolysis treatment. However, the rotary kiln has a non-heated area that is not heated by the heater (heater) on the inlet end side and outlet end side of the furnace due to its structure, and the product carbon black is between the heating area by the heater and the outlet end. Since it is taken out to the outside through the non-heated area, when the cracked gas generated from the heated waste tire (material) flows into the non-heated area of the furnace, the decomposed gas is cooled and condensed in the non-heated area. However, it may adhere to the product carbon black and adversely affect the quality of the product.

  In contrast to this, a gas discharge port is provided on the inlet end side of the furnace, and a replacement gas such as nitrogen gas is injected into the furnace from the outlet end, and the decomposition gas generated by heating by the replacement gas is moved to the outlet end side. It is possible to consider a method of replacing the inlet end side without discharging, and discharging to the outside from the outlet. However, in this method, since the passage cross-sectional area of the furnace is wide, a part where the pressure of the cracked gas is higher than the pressure of the replacement gas due to vortex or pulsation in the furnace, and the cracked gas moves to the outlet end side For example, it is difficult to surely replace all the cracked gas generated in the furnace to the inlet end side without moving it to the outlet end side, and discharge it from the outlet.

  An object of the present invention is to solve such problems of the prior art, and the object of the present invention is to condense components evaporated from the object to be processed by heating on the outlet end side of the furnace body. An object of the present invention is to provide a rotary kiln that can prevent adhesion to products.

The rotary kiln of the present invention has a cylindrical furnace body that rotates about an axis, and a heater that is disposed outside the furnace body, and is introduced into the furnace body from the inlet end of the furnace body. A rotary kiln that heats the processed object while being transported toward the outlet end of the furnace body, and is provided on the inlet end side of the furnace body and discharges gas generated from the processed object A replacement gas injection part that is provided on the outlet end side of the furnace body, and injects a replacement gas into the furnace body from the outlet end, a heating region by the heater inside the furnace body, and the furnace body provided between the outlet end, have a, and the partition plate for partitioning axially inside of the furnace body while forming a gap in which the replacing gas and the object to be processed passes, the partition plate, wherein It is formed in the helical shape about the axis of the furnace body It is characterized in.
According to the present invention, the partition plate is provided between the heating area by the heater inside the furnace body and the outlet end, and the passage area in the furnace body in the portion where the partition plate is provided is provided with the partition plate. By making it smaller compared to the case where there is no, the pressure of the substitution gas when passing through the partition plate from the outlet end side toward the inlet end side was always generated from the workpiece regardless of the presence or absence of vortex or pulsation. It is possible to maintain a state larger than the pressure of the gas, and the movement of the gas generated from the object to be processed to the outlet end side can be prevented. Thereby, it can prevent that the component vaporized from the to-be-processed object by heating moves to the exit end side of a furnace main body, and is condensed on the exit end side and adheres to a product. Further, according to this configuration, the passage area in the furnace body in the portion where the partition plate is provided is made as small as possible without hindering the movement of the workpiece in the furnace body to the outlet end side. The movement of the gas generated from the object to be processed to the outlet end side can be reliably prevented. Thereby, it can prevent more reliably that the component vaporized from the to-be-processed object by heating condenses on the exit end side of a furnace main body, and adheres to a product.

In the rotary kiln of the present invention, it is preferable that the partition plate is provided at a terminal portion of a heating region by the heater inside the furnace body.
According to this configuration, by preventing the gas generated from the object to be processed from moving to the outlet end side than the heating region, the components evaporated from the object to be processed by heating are condensed on the outlet end side of the furnace body. It can prevent more reliably that it adheres to a product.

In the rotary kiln of the present invention, it is preferable that the entire interior of the furnace body is closed by the partition plate when viewed from the axial direction of the furnace body.
According to this configuration, by making it difficult for the gas generated from the workpiece to move to the outlet end side beyond the partition plate, the component vaporized from the workpiece due to heating is on the outlet end side of the furnace body. Condensation and adhesion to the product can be further reliably prevented.

In the rotary kiln of the present invention, it is preferable that the plurality of partition plates are provided side by side in the axial direction.
According to this configuration, the plurality of partition plates can more reliably prevent the movement of the gas generated from the workpiece to the outlet end side without hindering the movement of the workpiece to the outlet end side. Thereby, it can prevent more reliably that the component vaporized from the to-be-processed object by heating condenses on the exit end side of a furnace main body, and adheres to a product.

In the rotary kiln of the present invention, it is preferable that the axial pitch of the spiral of the partition plate is larger than the feed amount of the workpiece by the rotation of the furnace body.
According to this configuration, it is possible to locally reduce the filling height of the object to be processed in the furnace body between the adjacent spiral partition plates, and thereby, between the material particles of the object to be processed. It is easy to remove the gas accumulated in the substrate, and the object to be processed can be reliably processed.
The feed amount of the workpiece is the amount of movement of the workpiece per one rotation of the furnace body.

The rotary kiln of the present invention is preferably one that recovers carbon black from waste tires that are input as the object to be processed.
With the rotary kiln having this configuration, it is possible to reliably remove oil from the waste tire and recover high-quality carbon black.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary kiln which can prevent that the component vaporized from the to-be-processed object by heating condensed on the exit end side of a furnace main body, and adheres to a product can be provided.

(A) is sectional drawing of the rotary kiln which is one embodiment of this invention, (b) is sectional drawing which follows the AA line shown to the figure (a), (c) is the figure (a) It is a perspective view of the partition plate shown in FIG. It is a modification of the rotary kiln shown in FIG. 1, and is a cross-sectional view showing a case where three partition plates are provided side by side in the axial direction. (A) is a rotary kiln of Example, a cross-sectional view showing a case in which the partition plate of D shaped outlet end of the furnace body, (b) is B-B shown in the diagram (a) It is sectional drawing which follows a line. (A) is a rotary kiln of Example, a cross-sectional view showing a case where the partition plate and disc-shaped outer diameter smaller than the inner diameter of the furnace body, (b) in FIG. (A) It is sectional drawing which follows the CC line shown. (A) is a modification of the rotary kiln shown in FIG. 1, and is a cross-sectional view showing a case where a gas discharge pipe is provided on the inlet end side of the furnace body, and (b) is a D- It is sectional drawing except the heater which follows a D line, (c) is a perspective view of the partition plate shown to the figure (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A rotary kiln 1 according to an embodiment of the present invention shown in FIG. 1 heats and thermally decomposes a rubber chip 2 as an object to be processed by finely cutting a waste tire, and removes oil and the like at the time of tire manufacture. The carbon black (carbide) 3 added as a reinforcing material to the rubber material is used to recover as a product.

  The rotary kiln 1 includes a furnace body 10 that is formed in a horizontally long cylindrical shape from a metal material having high heat conductivity such as steel. The furnace body 10 is supported by a support device (not shown) composed of, for example, a tire or a roller so as to be rotatable about its axis, and is driven by a drive device (not shown) such as an electric motor to have a constant speed. Configured to rotate at. Further, the furnace body 10 is arranged with its axial direction slightly inclined with respect to the horizontal direction. For example, in this embodiment, the furnace body 10 is installed with a gradient of 0.9%. ing. The higher axial end (left end in FIG. 1) of the furnace body 10 is an inlet end into which the rubber tip 2 as a material is charged, and the lower axial end (right end in FIG. 1) is the rubber tip 2. It becomes an outlet end from which the carbon black 3 obtained by the thermal decomposition treatment is taken out.

  A heater (heater) 11 is provided outside the furnace body 10, and the furnace body 10 is heated by the heater 11. The inner region of the portion covered by the heater 11 of the furnace body 10 is a heating region, and the furnace body 10 is heated by the heater 11 so that the furnace temperature in the heating region is about 450 ° C. to 600 ° C., for example. Heated. In addition, the internal area | region of the part which is not covered with the heater 11 in both the inlet end side of the furnace main body 10 and an outlet end side is a non-heating area | region, and the in-furnace temperature in these non-heating area | regions is 200 degreeC, for example To about 360 ° C., which is lower than the heating region.

  The heater 11 is formed, for example, in a cylindrical shape covering an intermediate portion of the outer periphery of the furnace main body 10 excluding a predetermined range on the inlet end side and a predetermined range on the outlet end side with a predetermined range. It can be set as the structure heated from the side. In this case, the heater 11 can be configured to be fixed to the outer peripheral surface of the furnace body 10, but is fixed to the base or the ground together with the support device, the drive device, and the like, and is relative to the rotating furnace body 10. It can also be set as the structure mounted rotatably.

  The furnace body 10 may be configured such that the heating region is divided into three or more zones having different temperatures from each other along the axial direction of the furnace body 10. In FIG. 1, the heater 11 is configured to include three heating units 11 a to 11 c along the axial direction of the furnace body 10, so that the heating region inside the furnace body 10 is divided into the heating units 11 a to 11 a. The case where it divides into three zones corresponding to 11c is shown. In this case, each heating unit 11a to 11c individually sets the furnace temperature in each zone to be different from each other, and allows the rubber chip 2 to pass through each zone having a different temperature so that the rubber chip 2 can be effectively used. Can be pyrolyzed.

As described above, when the heating region of the furnace body 10 is divided into three or more zones having different temperatures, the total amount of heat for each temperature zone in the heating region is 2500 or less. Is preferred.
Here, the amount of heat is a difference between the activation energy (J / mol) of the raw material containing the polymer compound (for example, waste tire (rubber chip 2)) charged in the pyrolysis furnace (furnace body 10). It is measured by a thermo-thermogravimetric simultaneous measuring device (TG-DTA), and can be calculated by using the measured activation energy value, gas constant, and temperature program during thermal decomposition. The amount of heat is a value corresponding to the product of the heating temperature (° C.) and the heating time (min) during pyrolysis.

  The inlet end of the furnace body 10 is covered in an airtight state by an inlet side hood 12, and the outlet end of the furnace body 10 is covered in an airtight state by an outlet side hood 13. These hoods 12 and 13 are formed in a cylindrical shape whose one end is closed by a metal material such as a steel material, for example, and are fixed to a base or the ground together with a support device and a drive device (not shown) to rotate. The furnace body 10 is mounted so as to be relatively rotatable.

  A material supply unit 14 is provided on the inlet end side of the furnace body 10, and the rubber chip 2, which is a material of carbon black, is introduced into the interior of the furnace body 10 from the inlet end of the furnace body 10. . The material supply unit 14 includes a cylindrical feeder pipe 14a. The feeder pipe 14a penetrates the inlet side hood 12, and the tip thereof is inserted into the furnace body 10 from the inlet end. The material supply unit 14 may be configured to include, for example, a screw for transferring the rubber chip 2 inside the feeder pipe 14a, and discharge a predetermined amount of the rubber chip 2 per unit time from the tip of the feeder pipe 14a. To do.

  The rubber chip 2 introduced into the furnace main body 10 from the material supply unit 14 is transferred in the heating region at a predetermined speed from the inlet end toward the outlet end by rotating the furnace main body 10 in an inclined state. . Thereby, the rubber chip 2 is heated to a predetermined temperature in the heating region in the furnace body 10 and subjected to a thermal decomposition process.

  The outlet side hood 13 provided at the outlet end of the furnace body 10 is provided with an outlet 15 that opens downward. The outlet 15 is provided immediately below the outlet end of the furnace body 10, and the carbon black 3 obtained by pyrolyzing the rubber chip 2 falls from the outlet end of the furnace body 10 toward the outlet 15. Then, it is recovered from the outlet 15.

  As described above, the rotary kiln 1 according to the present invention is heated in the heating region inside the furnace body 10 while transferring the rubber chip 2 introduced from the material supply unit 14 into the furnace body 10 from the inlet end toward the outlet end. Then, it can be thermally decomposed and recovered as carbon black 3 from the outlet 15.

  When the rubber chip 2 heated inside the furnace body 10 is thermally decomposed, the oil component is vaporized to generate decomposition gas. When this cracked gas is cooled and condensed in the non-heated region on the outlet end side of the furnace body 10, the oil component adheres to the carbon black 3 that is the product, and the quality of the product deteriorates. Therefore, in the rotary kiln 1, the replacement gas G is injected into the furnace main body 10 from the outlet end, and the decomposition gas generated from the rubber chip 2 heated by the replacement gas G is replaced on the inlet end side in the furnace main body 10. Then, the gas is discharged from the inlet end to the outside of the furnace body 10.

  In order to inject the replacement gas G into the furnace main body 10 from the outlet end, the outlet side hood 13 is provided with a replacement gas injection portion 16. For example, the replacement gas injection unit 16 can be configured as a nozzle that passes through the outlet side hood 13 and is directed toward the outlet end of the furnace body 10, and discharges the replacement gas G toward the inside of the furnace body 10. The replacement gas injection unit 16 replaces the replacement gas at a predetermined flow rate so that the pressure on the outlet end side of the furnace body 10 including the inside of the outlet hood 13 is higher than the internal pressure in the heating region of the furnace body 10. G is discharged. When the replacement gas G is injected into the furnace main body 10 from the outlet end by the replacement gas injection unit 16, the decomposition gas generated from the heated rubber chip 2 is pushed to the inlet end side of the furnace main body 10 by the replacement gas G. Moving.

  Nitrogen gas is preferably used as the replacement gas G injected from the replacement gas injection unit 16 into the furnace body 10, but an inert gas or oxygen-free gas other than the nitrogen gas can also be used. In addition, the replacement gas G can be injected into the furnace body 10 at room temperature, but it is preferable to inject the replacement gas G into the furnace body 10 in a heated high temperature state. For example, by injecting the replacement gas G into the furnace body 10 while being heated to about 450 ° C. to 750 ° C., it is possible to suppress a decrease in the internal temperature of the furnace body 10 due to the injection of the replacement gas G, By increasing the volume of the replacement gas G, the pressure can be increased and the cracked gas can be more effectively replaced to the inlet end side.

  On the other hand, the inlet side hood 12 is provided with a gas discharge port 17. The gas discharge port 17 is formed in a chimney shape protruding upward from the inlet-side hood 12 and can discharge the gas inside the furnace body 10 to the outside. Therefore, when the replacement gas G is injected into the furnace body 10 from the outlet end, and the cracked gas generated from the heated rubber chip 2 is replaced by the replacement gas G on the inlet end side of the furnace body 10, the cracked gas becomes The gas is discharged from the gas outlet 17 to the outside.

  A partition plate 31 is provided at the end portion of the heating region inside the furnace body 10, that is, at the boundary portion with the non-heating region on the outlet side of the heating region.

As shown in FIG.1 (c), this partition plate 31 is the furnace main body 10 by staggering the disk member formed with metal plates, such as a steel plate, in the axial direction alternately at the notch part along the radius. It is formed in a spiral shape having an axial center coinciding with the axial center. The partition plate 31 is fixed to the inner peripheral surface of the furnace body 10 by welding or the like along the entire outer periphery. Thereby, as shown in FIG.1 (b), the partition plate 31 will be in the state which block | closed the whole inside of the furnace main body 10, seeing from the axial direction of the furnace main body 10, and the inside of the furnace main body 10 is axial direction. It is divided into.
The partition plate 31 is not limited to the one formed in a spiral shape by processing a disk member having a cut portion, but is formed in a spiral shape by another processing method such as casting or pressing, for example. It can also be.

  The partition plate 31 is configured to rotate together with the furnace body 10 by fixing the outer peripheral edge thereof to the inner peripheral surface of the furnace body 10. The gap 31 a formed by shifting the cut portion of the partition plate 31 in the axial direction corresponds to the axial pitch of the spiral of the partition plate 31, and this axial pitch of the rubber chip 2 due to the rotation of the furnace body 10. It is set to coincide with the feed amount (the amount of movement of the rubber chip 2 per one rotation of the furnace body 10).

  By rotating together with the furnace body 10, the partition plate 31 having such a configuration can pass the rubber chip 2 from the gap 31a toward the outlet side without changing the feed amount. Further, the gap 31a of the partition plate 31 is made smaller than the cross-sectional area of the internal passage of the furnace body 10, that is, the passage area of the furnace body 10 in the portion where the partition plate 31 is provided is provided by the partition plate 31. It is smaller than the case where it is not possible. As a result, the pressure when the replacement gas G injected into the furnace body 10 passes through the gap 31a of the partition plate 31 from the outlet end side toward the inlet end side is irrespective of whether vortex or pulsation is present. The pressure is always kept higher than the pressure of the cracked gas generated from the rubber chip 2 in the heating region. Therefore, the cracked gas generated in the heating region is pushed back to the inlet end side by the pressure of the replacement gas G in the gap 31a of the partition plate 31, and the cracked gas exits from the furnace body 10 through the gap 31a of the partition plate 31. Moving to the end side can be reliably prevented.

  Thus, the partition plate 31 can prevent the decomposition gas generated from the rubber chip 2 from moving to the outlet end side without disturbing the transfer of the rubber chip 2 to the outlet end side. In particular, the partition plate 31 has a shape that covers the entire interior of the furnace body 10 when viewed from the axial direction, thereby making it difficult for the cracked gas to move to the outlet end side beyond the partition plate 31, It is possible to reliably prevent the cracked gas from moving to the outlet end side. That is, not only the replacement gas G is injected from the outlet end of the furnace body 10 but also the partition plate 31 is provided between the heating area and the outlet end, so that the cracked gas generated from the rubber chip 2 in the heating area is the furnace body 10. It is possible to reliably prevent the oil component condensed with cracked gas from adhering to the product carbon black 3.

The partition plate 31 can be provided at an arbitrary position between the heating region by the heater 11 inside the furnace body 10 and the outlet end. However, as in the present embodiment, the partition plate 31 is disposed at the end of the heating region. By providing in the part, the movement of the cracked gas generated from the rubber chip 2 to the outlet end side can be prevented more reliably than the heating region.
Here, as mentioned above, when it is set as the structure which divided | segmented the heating area | region of the furnace main body 10 into three or more zones from which temperature differs mutually, the partition plate 31 is divided | segmented into three or more divided | segmented heating areas. Among the zones, it is preferable to be installed at a position where the temperature at the most outlet side zone is 360 ° C. or higher. As a result, the cracked gas generated from the rubber chip 2 is more reliably prevented from moving to the outlet end side than the heated region, while the condensed gas is prevented from condensing near the outlet side of the heated region. It is possible to reliably prevent the oil component condensed with the cracked gas from adhering to the discharged carbon black 3.

  FIG. 2 is a modification of the rotary kiln shown in FIG. 1, and is a cross-sectional view showing a case where three partition plates are provided side by side in the axial direction. In the present embodiment, one spiral partition plate is provided inside the furnace body, but a plurality of partition plates can also be provided side by side in the axial direction inside the furnace body. For example, FIG. 2 shows a case where three spiral partition plates 31 are arranged in the axial direction. As described above, by providing a plurality of spiral partition plates 31 inside the furnace body 10, the cracked gas generated from the rubber chip 2 is moved to the outlet end side without disturbing the movement of the rubber chip 2 to the outlet end side. Can be reliably prevented.

  Moreover, in this case, by making the axial pitch of the spiral of each partition plate 31 larger than the feed amount of the rubber chip 2 due to the rotation of the furnace body 10, the same amount is set between the adjacent spiral partition plates 31. The rubber chip 2 can be spread over a wider area and disposed to locally reduce the filling height inside the furnace body 10. As a result, the rubber chips 2 are more evenly spread between the adjacent partition plates 31, so that the decomposition gas accumulated between the material grains can be efficiently removed from the rubber chips 2 in the thermal decomposition process. Oil can be removed reliably.

  In the case shown in FIG. 2, three spiral partition plates 31 are arranged side by side in the axial direction. However, depending on the size of the furnace body 10, the pressure of the replacement gas G, and the like, for example, 2 to 7 Arbitrary number of partition plates 31 can be provided. In addition, the plurality of partition plates 31 are not limited to the configuration in which the individually formed partitions are arranged side by side, but may be configured to be integrally formed. In this case, the partition plate 31 can also be formed by other methods such as casting.

3 (a) is a rotary kiln of Example, a cross-sectional view showing a case in which the partition plate of D shaped outlet end of the furnace body, FIG. 3 (b) in FIG. (A) It is sectional drawing which follows the BB line shown. 4 (a) is a rotary kiln of Example, a cross-sectional view showing a case where the partition plate and disc-shaped outer diameter smaller than the inner diameter of the furnace body, FIG. 4 (b) It is sectional drawing which follows the CC line shown to the figure (a) .

  For example, as shown in FIG. 3, the partition plate 31 may have a D shape in which a part of the disc is cut out along the chord 31 b. In this case, the partition plate 31 is fixed to the outlet side hood 13 by a support leg or the like (not shown), and is arranged at the outlet end of the furnace body 10 without rotating integrally with the furnace body 10. Further, the partition plate 31 is arranged with the direction of the string 31b slightly inclined with respect to the horizontal direction. The inclination angle of the string 31b with respect to the horizontal direction is adjusted to coincide with the inclination angle of the carbon black 3 that is transferred while being slightly biased in the rotation direction inside the furnace body 10 by the rotation of the furnace body 10. Thereby, while making the carbon black 3 transferred by the furnace body 10 pass the partition plate 31 through the gap 31a by the notch portion of the partition plate 31, the interval between the partition plate 31 and the carbon black 3 is minimized, The movement of the cracked gas to the outlet end side can be more effectively prevented.

  Further, for example, as shown in FIG. 4, the partition plate 31 may be a disk having an outer diameter smaller than the inner diameter of the furnace body 10. In this case, the partition plate 31 is arranged perpendicular to the axial direction with its axis aligned with the axis of the furnace body 10, and is fixed to the inner peripheral surface of the furnace body 10 via a support leg (not shown). And is rotated integrally with the furnace body 10. The outer diameter of the partition plate 31 is set to a value that does not contact the rubber chip 2 that is transferred inside the furnace body 10. Therefore, the rubber chip 2 can move toward the outlet end through the annular gap 31a formed between the outer peripheral edge of the partition plate 31 and the inner peripheral surface of the furnace body 10. Similarly, the replacement gas G can also move to the inlet end side through an annular gap 31 a formed between the outer peripheral edge of the partition plate 31 and the inner peripheral surface of the furnace body 10.

  2 to 4 also, the cracked gas generated from the rubber chip 2 in the heating region moves to the outlet end side of the furnace body 10 as in the case shown in FIG. It is possible to prevent the oil component of the cracked gas from adhering to the product carbon black 3.

  FIG. 5 (a) is a modification of the rotary kiln shown in FIG. 1, and is a cross-sectional view showing a case where a gas discharge pipe is provided on the inlet end side of the furnace body, and FIG. 5 (b) is the same figure (a). FIG. 5 (c) is a perspective view of the partition plate shown in FIG. 5 (a). In the case shown in FIG. 1, the decomposition gas generated from the heated rubber chip 2 is discharged to the outside from the gas discharge port 17 provided in the inlet side hood 12. A configuration in which the tube 41 is provided may be employed.

  The gas discharge pipe 41 is formed of, for example, a pipe member having a circular cross section such as an iron pipe, and is disposed across the inside and outside of the furnace body 10 through the inlet side hood 12. The gas discharge pipe 41 is formed to be sufficiently thin with respect to the furnace body 10. For example, the outer diameter of the gas discharge pipe 41 can be set to about 1/10 of the inner diameter of the furnace body 10. The gas discharge pipe 41 is inserted into the furnace main body 10 from the inlet end of the furnace main body 10, and the tip thereof is arranged in a heating region inside the furnace main body 10 heated by the heater 11. On the other hand, the base end of the gas exhaust pipe 41 is disposed outside the inlet side hood 12. The gas discharge pipe 41 having such a configuration takes in the cracked gas from the tip disposed in the heating region inside the furnace body 10 and discharges it from the base end disposed outside the furnace body 10 to the outside. Can do. That is, the gas discharge pipe 41 can take in the decomposition gas generated by heating the rubber chip 2 in the heating region inside the furnace body 10 from the tip in the heating region and discharge it to the outside. Thus, the cracked gas can be directly taken into the gas discharge pipe 41 in the heating region and discharged outside without passing through the non-heating region on the inlet end side of the furnace body 10. It is possible to prevent the decomposition gas from being cooled and condensed in the non-heated region and adhere to the rubber chip 2. Further, by preventing the oil component condensed from the cracked gas from adhering to the rubber chip 2 and changing the amount of heat necessary for the thermal decomposition treatment of the rubber chip 2, the quality controllability by the heating amount of the rotary kiln 1 is improved, and the rubber chip 2 Overheating and insufficient heating can be prevented.

  The gas discharge pipe 41 can be configured to forcibly suck a gas such as a cracked gas from its tip, but can also be configured to only naturally suck the gas. Further, for example, by providing a condenser device at the base end or in the middle of the gas discharge pipe 41, the decomposition gas taken in from the gas discharge pipe 41 can be liquefied and recovered. In this case, the oil content generated by the thermal decomposition treatment of the rubber chip 2 can be easily recovered.

As shown in the figure, the gas exhaust pipe 41 can be configured to have a sloped portion 41a that is sloped so that the proximal end side gradually becomes lower than the distal end side.
Since the gas exhaust pipe 41 extends outside the inlet side hood 12 through the non-heated region of the furnace body 10, there is a possibility that the cracked gas taken in from the tip of the gas exhaust pipe 41 may be condensed inside the gas exhaust pipe 41. By providing the slope 41a with the slope in the pipe 41, even if the cracked gas is condensed inside the gas discharge pipe 41, the oil component generated by the condensation is reduced in the slope 41a of the gas discharge pipe 41. It flows toward the end, that is, the outside of the furnace body 10. As described above, by providing the gas exhaust pipe 41 with the sloped portion 41a, even if the cracked gas is condensed inside the gas exhaust pipe 41, the condensed oil is allowed to flow outside the furnace body 10. It is possible to prevent the gas from flowing back into the furnace body 10 and adhering to the rubber chip 2.

  In order to discharge cracked gas to the outside more efficiently by the gas discharge pipe 41, a partition plate is provided at the start end portion of the heating region by the heater 11 inside the furnace body 10, that is, the boundary portion with the non-heating region on the inlet side of the heating region. 42 can also be provided.

As shown in FIG.5 (c), this partition plate 42 is the furnace main body 10 by staggering the disk member formed with metal plates, such as a steel plate, in the axial direction alternately at the notch part along the radius. It is formed in a spiral shape having an axial center coinciding with the axial center. The partition plate 42 is fixed to the inner peripheral surface of the furnace body 10 by welding or the like around the entire outer periphery. Thereby, as shown in FIG. 5B, the partition plate 42 is in a state in which the entire interior of the furnace body 10 is closed as viewed from the axial direction of the furnace body 10, and the interior of the furnace body 10 is axially directed. It is divided into.
The partition plate 42 is not limited to the one formed in a spiral shape by processing a disk member having a cut portion, but is formed in a spiral shape by other processing methods such as casting and pressing, for example. It can also be.

  The partition plate 42 rotates together with the furnace body 10 by fixing the outer peripheral edge thereof to the inner peripheral surface of the furnace body 10. A gap 42 a formed by shifting the cut portion of the partition plate 42 in the axial direction corresponds to the axial pitch of the spiral of the partition plate 42, and this axial pitch of the rubber chip 2 by the rotation of the furnace body 10. It is set to coincide with the feed amount (the amount of movement of the rubber chip 2 per one rotation of the furnace body 10). By rotating together with the furnace body 10, the partition plate 42 having such a configuration can pass the rubber chip 2 from the gap 42a toward the outlet side without changing the feed amount.

  The distal end portion 41 b of the gas discharge pipe 41 is formed in a straight line extending along the axis of the furnace body 10. A through hole 42b is provided in the axial center of the partition plate 42, and a tip end portion 41b of the gas discharge pipe 41 is inserted into the through hole 42b and protrudes from the partition plate 42 toward the heating region. 42 is supported in a relatively rotatable manner.

  By providing such a partition plate 42, while the rubber chip 2 is transferred from the inlet end side to the outlet end side inside the furnace body 10, the decomposition gas generated from the rubber chip 2 in the heating region inside the furnace body 10 is The movement of the furnace body 10 toward the inlet end side can be suppressed, and the cracked gas can be efficiently taken into the gas discharge pipe 41 and discharged to the outside.

  Although the partition plate 42 can be provided at an arbitrary position between the heating region by the heater 11 inside the furnace body 10 and the inlet end, the partition plate 42 is provided at the start end of the heating region as in the present embodiment. By providing in the portion, it is possible to more reliably prevent the decomposition gas generated from the rubber chip 2 from moving to the inlet end side than the heating region.

  It goes without saying that the present invention is not limited to the above-described embodiments or examples, and various modifications can be made without departing from the scope of the invention.

  For example, in the embodiment described above, the present invention is applied to the rotary kiln 1 for recovering the carbon black 3 by thermally decomposing the rubber chip 2 formed from the waste tire as the object to be processed. Not only for other purposes such as rotary kiln for pyrolyzing waste containing other hydrocarbons such as waste plastic as processing object, rotary kiln for drying processing object such as powder The present invention can also be applied to the rotary kiln used.

1 Rotary kiln 2 Rubber tip (object to be processed)
DESCRIPTION OF SYMBOLS 10 Furnace main body 11 Heater 16 Replacement gas injection | pouring part 17 Gas exhaust port 31 Partition plate 31a G G Replacement gas

Claims (6)

A cylindrical furnace body that rotates about an axis, and a heater that is disposed outside the furnace body, and an object to be processed that has been introduced into the furnace body from the inlet end of the furnace body A rotary kiln that is heated while being transferred toward the outlet end of the furnace body,
A gas discharge port provided on the inlet end side of the furnace body for discharging the gas generated from the object to be processed;
A replacement gas injection part that is provided on the outlet end side of the furnace body and injects a replacement gas into the furnace body from the outlet end;
It is provided between the heating area by the heater inside the furnace body and the outlet end of the furnace body, and the inside of the furnace body is axially formed while forming a gap through which the workpiece and the replacement gas pass. possess and the partition plate, the partitioning to,
The partition plate, wherein that you have been formed in a spiral shape around the axis of the furnace body rotary kiln.   The rotary kiln according to claim 1, wherein the partition plate is provided at a terminal portion of a heating region by the heater inside the furnace body.   The rotary kiln according to claim 1 or 2, wherein the entire interior of the furnace body is closed by the partition plate when viewed from the axial direction of the furnace body. The rotary kiln according to any one of claims 1 to 3 , wherein the plurality of partition plates are provided side by side in the axial direction. The rotary kiln according to claim 4 , wherein an axial pitch of the spiral of the partition plate is larger than a feed amount of the object to be processed by rotation of the furnace body. The rotary kiln of any one of Claims 1-5 which collect | recovers carbon black from the waste tire thrown in as the said to-be-processed object.

Images