JP2010117075A - Rotary kiln-type material heating and drying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary kiln-type material heating and drying device capable of performing batch feeding of a continuous feeding rotary kiln and of controlling a heating material to a prescribed temperature. <P>SOLUTION: The tilted and supported kiln 3 can be rotated normally and reversely. Scraping-up blades 2 within the kiln 3 have a shape capable of scraping up the material during both normal and reverse rotations of the kiln 3, and returning blades 10 for inhibiting discharge of the material during the normal rotation of the kiln 3 and pushing out the material to outside of the kiln 3 during the reverse rotation of the kiln 3 are disposed at a material discharge end of the kiln 3. A material circulation pipe 11 for circulating the material on the material discharge side to the material input side during normal rotation of the kiln 3 is spirally provided around the outer periphery of the kiln 3. During normal rotation of the kiln 3, discharge of the material is inhibited by the returning blades 10 to retain the material and the material is heated and dried while circulated via the material circulation pipe 11. By discharging the heating material to outside of the kiln 3 by the reverse rotation of the kiln 3, the batch feeding can be performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary kiln type material heating and drying apparatus for heating and drying aggregates and the like at a predetermined temperature.

A rotary kiln-type material heating and drying apparatus, for example, as in an asphalt plant dryer (see Patent Document 1), rotatably supports a cylindrical kiln having a plurality of scraping blades on the inner periphery, and While supplying hot air from a burner disposed at one end of the kiln while rotating at a predetermined speed by a driving motor, while rolling the material down into the kiln while scooping up the material thrown into the kiln with the blades It is heated to a predetermined temperature and is mainly used to heat and dry the material continuously.
Japanese Utility Model Publication No. 61-193109

  However, in the rotary kiln type material heating and drying apparatus, the temperature of the heating material (or the exhaust gas temperature (cocurrent heating method of the co-current heating method) that continuously feeds the material into the kiln and continuously feeds the kiln in a rolling flow. )) Is measured, and this is fed back to adjust the burner combustion amount, so there is a time lag, and if the material supply amount and burner combustion state are not stable, the heating material temperature may fall within the predetermined value. In particular, it is difficult to control the temperature of the heating material discharged from the kiln at the beginning and end of operation, and quality may not be ensured for products that require severe temperature control. In addition, since the kiln continuously heats and feeds the material, when the next process equipment is a batch type, the kiln is continuously fed, such as a storage container that temporarily stores the heated material is absolutely necessary. However, there are also disadvantages.

  In view of the above-described points, an object of the present invention is to provide a rotary kiln-type material heating and drying apparatus that enables batch feeding of a continuous feed rotary kiln and allows a heating material to be controlled to a predetermined temperature.

  In order to solve the above problems, a rotary kiln-type material heating and drying apparatus according to claim 1 is configured to rotatably support a cylindrical kiln having a plurality of scraping blades on an inner periphery thereof, and to support the kiln. While supplying hot air from a burner arranged at one end of the kiln while rotating at a predetermined speed by a driving motor, while rolling down the kiln while scraping up the material supplied in the kiln with the scraping blades In a rotary kiln-type material heating and drying apparatus that heats to a predetermined temperature, the drive motor that rotates the kiln can be rotated forward and backward, and the scraping blade can scrape the material during both forward and reverse rotations of the kiln. And at the material discharge end of the kiln, the material is pushed back toward the material input side of the kiln during the forward rotation of the kiln to prevent discharge, and the material is discharged during the reverse rotation of the kiln. While providing a return blade that pushes out of the kiln, it is equipped with a kiln rotation controller that controls forward and reverse rotation of the drive motor of the kiln, and when the kiln is rotating forward, the material discharge side material of the kiln is moved to the material input side It is characterized in that a material circulating means for circulating is arranged.

  The rotary kiln-type material heating / drying apparatus according to claim 2 is configured such that a material circulation pipe having a predetermined diameter is spirally provided along the kiln length direction on the outer periphery of the kiln as the material circulation means. One end of the kiln is connected to the material discharge side of the kiln, the other end is connected to the material input side, and the material on the kiln material discharge side is dropped into the material circulation pipe during the forward rotation of the kiln. It is characterized in that it is configured to move in the circulation pipe and circulate to the material input side.

  Further, in the rotary kiln type material heating and drying apparatus according to claim 3, the kiln is formed into a double cylinder shape including an inner cylinder and an outer cylinder, and a partition plate is provided between the inner cylinder and the outer cylinder along the kiln length direction. The material circulation passage is formed by arranging the material circulation passages, and the material circulation passage is formed at both ends of the material circulation passage so that the material circulation side of the material at the material discharge side of the kiln is rotated during the forward rotation of the kiln. It is characterized in that it is configured such that it is dropped into the passage and moved in the material circulation passage along with the rotation of the kiln and circulated to the material input side.

  The rotary kiln-type material heating / drying apparatus according to claim 4 further includes a temperature sensor for measuring a heating material temperature on the material discharge side of the kiln, and the temperature detected by the temperature sensor is taken into the kiln rotation controller, to the kiln. When the material supply starts, the kiln is rotated forward and the material flowing down in the kiln is pushed back by the return vane on the kiln discharge side and heated while staying in the kiln. If the temperature detected by the temperature sensor reaches the predetermined temperature, the kiln is The kiln is controlled to be switched from the normal rotation to the reverse rotation by the rotation controller, and the heating material is sent out of the kiln.

  According to the rotary kiln-type material heating and drying apparatus according to claim 1 of the present invention, the drive motor for rotating the kiln is freely rotatable in the forward and reverse directions, and the scraping blade is a material when the kiln is rotated in both forward and reverse directions. In the kiln's material discharge end, the material is pushed back toward the material input side of the kiln to prevent discharge, and when the kiln reversely rotates, the material is moved out of the kiln. A material having a kiln rotation controller for controlling forward / reverse rotation of the drive motor of the kiln while arranging return blades to be pushed out, and for circulating the material on the material discharge side of the kiln to the material input side during the forward rotation of the kiln Since the circulation means is installed, the material can be retained and discharged freely by switching the forward / reverse rotation of the kiln, allowing batch feeding to the next process, and continuous feed rotary kiln is a batch facility. It becomes possible to adopt. In addition, when preventing the discharge of the material to rotate the kiln forward, the material circulating means circulates the material on the material discharge side of the kiln to the material input side, scrapes it up again with the scraping blade, and contacts the hot air with the kiln. The heating efficiency can be improved, and the material temperature can be made uniform. In the reverse rotation of the kiln, the continuous feed is the same as the conventional one, and it has both batch feed and continuous feed functions. Moreover, since the residence time of the material in the kiln can be arbitrarily set by batch feeding of the kiln, the heating material at the beginning of operation can be controlled to a predetermined temperature.

  Further, according to the rotary kiln type material heating and drying apparatus according to claim 2, the material circulation means includes a material circulation pipe having a predetermined diameter on the outer periphery of the kiln and spirally disposed along the kiln length direction. One end of the circulation pipe is connected to the material discharge side of the kiln, the other end is connected to the material input side, and the material on the kiln material discharge side is dropped into the material circulation pipe during the forward rotation of the kiln. Since the material circulation pipe is moved and circulated to the material input side, the material on the material discharge side of the kiln is transferred to the material input side via the material circulation pipe when the material discharge is prevented from rotating forward in the kiln. By circulating and scraping again with the scraping blade, the amount of scraping is increased, the heating efficiency of the kiln can be improved to increase the chance of contact with hot air, and the material temperature can also be made uniform.

  According to the rotary kiln-type material heating and drying apparatus according to claim 3, the kiln has a double cylinder shape including an inner cylinder and an outer cylinder, and a partition plate is disposed between the inner cylinder and the outer cylinder in the kiln length direction. The material circulation passage is formed by spirally forming the material circulation passage, and the material inlet / outlet of the kiln is formed at both end positions of the material circulation passage. It is configured to drop into the material circulation passage and move in the material circulation passage as the kiln rotates and circulate to the material input side. Therefore, when the material discharge is prevented from rotating forward, the kiln is rotated via the material circulation passage. By circulating the material on the material discharge side to the material input side and increasing the scraping amount by the scraping blade, the heating efficiency of the kiln can be improved, and the material temperature can be made uniform. Further, when it is desired to increase the amount of material to be circulated, the structure is more suitable than the material circulation pipe.

  Further, according to the rotary kiln type material heating and drying apparatus according to claim 4, the temperature sensor for measuring the heating material temperature is provided on the material discharge side of the kiln, and the temperature detected by the temperature sensor is taken into the kiln rotation controller, At the start of material supply to the kiln, the kiln is rotated forward and the material flowing down in the kiln is pushed back by the return vane on the kiln discharge side and heated while staying in the kiln, and if the temperature detected by the temperature sensor reaches a predetermined temperature Since the kiln rotation controller controls the kiln from forward rotation to reverse rotation so that the heating material is sent out of the kiln, the heating material is kept in the kiln until the heating material reaches a predetermined temperature. Temperature can be controlled.

  In the rotary kiln-type material heating and drying apparatus of the present invention, the drive motor for rotating the tilted kiln can be rotated forward and backward, and the scraping blade disposed on the inner periphery of the kiln is the reverse of the kiln. The material can be scraped up during both rotations, and even when the kiln is rotated forward or backward, the charged material is scraped and dropped into a bale and sent to the material discharge side along the kiln slope. Yes.

  At the material discharge end of the kiln, there is disposed a return vane that pushes the material back toward the kiln material input side during forward rotation of the kiln to prevent discharge, and pushes the material out of the kiln during reverse rotation of the kiln. A kiln rotation controller that controls forward and reverse rotation of the drive motor of the kiln is provided, and when the kiln rotates in the forward direction according to the command of the kiln rotation controller, the material is retained in the kiln without being discharged by the return blade, while the kiln is rotated in reverse. Sometimes the return blades are used to feed the material out of the kiln.

  When the kiln is rotated in the forward direction so that the material stays in the kiln without discharging the material, the material stays biased toward the material discharge side of the kiln. Heat transfer is reduced because no heat is transferred by the side scraping. For this reason, a material circulating means for circulating the material on the material discharge side of the kiln to the material input side is arranged to increase the heating efficiency.

  In addition, a temperature sensor for measuring the heating material temperature is provided on the material discharge side of the kiln, and the heating material temperature detected by the temperature sensor is taken into the kiln rotation controller, and when the heating material temperature reaches a predetermined set temperature, Command to switch rotation.

  Therefore, when the kiln is rotated forward, the rotary kiln type material heating and drying apparatus prevents the discharge of the material by the return blade at the material discharge end of the kiln, and the material reaching the material discharge side of the kiln by the material circulation means. While heating and drying while circulating to the material input side, when the kiln is rotated in reverse, the material is sent out of the kiln, and batch transfer to the next process can be performed by switching the forward and reverse rotation of the kiln. When the is rotated in reverse, it also becomes continuous feed, and has both batch feed and continuous feed functions.

  When the rotary kiln-type material heating and drying device is fed in batches and the material is supplied to the batch equipment in the next process, the material that rolls down in the kiln by rotating the kiln forward at the start of material input to the kiln. Push back with the return vane at the kiln discharge end to prevent discharge. Then, a predetermined amount of material is put into the kiln, the material is caused to flow down to the material discharge side along the inclination of the kiln while being scraped up by the scraping blade, and the material reaching the material discharge side of the kiln is discharged by the material circulation means. Heating and drying to a predetermined temperature while circulating to the material input side. If there is a material supply request for the next process, the kiln is reversely rotated by a command from the kiln rotation controller. At this time, it is preferable that the heating material temperature detected by the temperature sensor is continuously taken into the kiln rotation controller, and the kiln is rotated in reverse after confirming that the heating material temperature is a predetermined set temperature.

  By switching the rotation of the kiln, the return blade exerts an action of pushing the material out of the kiln from the push-back action of the material, and the material heated in the kiln is sent out of the kiln. Then, when a predetermined amount of heated material is sent to the next process, the kiln is rotated in the forward direction by the rotation switching command of the kiln rotation controller to stop the feeding, and the material of the next batch is supplied into the kiln and stays in the kiln. Then, it is heated and dried to prepare for supply to the next step.

  In addition, when a rotary kiln type material heating and drying device is continuously fed and supplied to the next process, the material that rolls down and flows through the kiln is rotated in the same manner as described above at the start of charging the material into the kiln. While it is pushed back by the return vane at the discharge end and stays in the kiln, it is heated while circulating to the material input side by the material circulation means, and the heating material temperature detected by the temperature sensor is taken into the kiln rotation controller, and the heating material temperature When the temperature reaches a predetermined set temperature, the kiln rotation controller switches and controls the kiln from the normal rotation to the reverse rotation so that the heating material is sent out of the kiln. As a result, the heating material can be controlled to a predetermined temperature even at the beginning of operation when the material supply and the burner combustion state are not stable, and quality can be ensured even for the manufacture of products that require severe temperature management.

  In this way, the kiln can be rotated forward and backward, and at the material discharge end of the kiln, the discharge of the material is prevented during the forward rotation of the kiln, and the return blade that pushes the material out of the kiln during the reverse rotation of the kiln is disposed. The material can be retained and discharged freely and batch feeding can be performed. Further, by circulating the material that has reached the material discharge side of the kiln during the forward rotation of the kiln to the material input side by the material circulation means, the heating efficiency of the kiln can be improved and the material temperature can be made uniform. In addition, the reverse rotation of the kiln results in continuous feed similar to the conventional one, and has both batch feed and continuous feed functions. Further, when batch feeding is used, the residence time of the material in the kiln is arbitrary, so that the heating material can be controlled to a predetermined temperature.

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

  FIG. 1 is a schematic configuration diagram of a rotary kiln-type material heating / drying apparatus according to the present invention. The material heating / drying apparatus 1 includes a cylindrical kiln 3 provided with a large number of scraping blades 2 on an inner peripheral portion thereof. It is tilted and supported so that it can rotate freely, and can be rotated forward or backward at a predetermined rotational speed by a drive motor 5 that can rotate forward and backward.

  A burner 6 is disposed at one end of the kiln 3, the burner 6 is burned and hot air is sent into the kiln 3, and combustion gas is exhausted by an exhaust fan (not shown) downstream of the exhaust duct 7 at the other end of the kiln. The material discharged from the material hopper (not shown) is charged into the kiln 3 via the belt conveyor 8 and heated to a desired temperature while the material is rolling down in the kiln 3. It is discharged from the discharge port 9. Further, a dust collector (not shown) is disposed downstream of the exhaust duct 7, and dust exhausted in the exhaust gas is trapped and purified exhaust gas is discharged from a chimney (not shown) into the atmosphere.

  In the inner peripheral portion of the material discharge end of the kiln 3, the material supplied during the forward rotation of the kiln 3 is pushed back toward the material input side of the kiln 3 to prevent the discharge, and the material is discharged through the reverse rotation of the kiln 3. A return blade 10 that pushes out to 9 is disposed. The return blade 10 is provided with a plurality of plate bodies having a predetermined length inclined on the inner peripheral wall of the kiln 3 with a slight inclination with respect to the kiln axis. It is possible to move in the forward and reverse directions with respect to the axial direction of the kiln 3 while pressing. Further, since the kiln 3 rotates forward and backward, the scraping blade 2 has, for example, a substantially T-shaped section as shown in FIG. 2, so that the material can be scraped up even when the kiln 3 rotates both forward and backward.

  Therefore, when the kiln 3 is rotated in the forward direction, the charged material is heated and dried in contact with the hot air passing through the kiln 3 while being scraped up by the scraping blades 2 and dropped into the bale in the kiln 3. However, it rolls down along the inclination of the kiln 3, but is pushed back by the return blade 10 at the material discharge end of the kiln 3 and is prevented from being discharged, and stays in the kiln 3. Further, when the kiln 3 is rotated in the reverse direction, the return blade 10 pushes the material toward the material discharge side of the kiln 3, so that the material in the kiln 3 is scraped up by the scraping blade 2 and dropped. However, it rolls down along the inclination of the kiln 3 and is discharged from the discharge port 9.

  Further, when the kiln 3 is rotated in the forward direction so as to stay in the kiln 3 without discharging the material, a material circulation pipe 11 serving as a material circulation means for circulating the material on the material discharge side of the kiln 3 to the material input side is arranged. Has been established. In the material circulation pipe 11, a plurality of pipes having a predetermined diameter are spirally provided along the kiln length direction on the outer periphery of the kiln 3, and one end of the material circulation pipe 11 penetrates the material discharge side of the kiln 3. Thus, the inlet portion 11a is formed, while the other end is penetrated and connected to the material charging side to form the outlet portion 11b.

  As shown in FIG. 2, the inlet portion 11 a of the material circulation pipe 11 causes the material to be scooped up and dropped into the material circulation pipe 11 when the kiln 3 is rotated in the positive direction indicated by the solid line arrow. When rotating in the reverse direction indicated by the dotted arrow, the structure is such that the material is not dropped into the material circulation pipe 11. In addition, as shown in FIG. 3, the outlet 11b of the material circulation pipe 11 prevents material from entering from the open pipe end even if it rotates in the forward direction indicated by the solid line arrow and the reverse direction indicated by the dotted line arrow. The pipe end is positioned higher than the inner wall surface of the kiln 3, and a charging prevention cover 12 is attached so that the material falling from the scraping blade 2 does not enter.

  The rotation control of the kiln 3 is performed automatically or manually by the kiln rotation controller 13. Further, a temperature sensor 14 for measuring the temperature of the heating material immediately upstream of the return blade 10 of the kiln 3 is provided, and the temperature detected by the temperature sensor 14 is taken into the kiln rotation controller 13. Then, the automatic control of the kiln rotation controller 13 is, for example, when the kiln 3 is batch fed, the kiln 3 is rotated forward at the start of material charging, the material is retained in the kiln 3, and the batch equipment from the next process is used. If there is a material supply request and the temperature detected by the temperature sensor 14 reaches a predetermined set temperature, the kiln 3 is controlled to switch to reverse rotation and the heated material is sent out of the kiln 3 so that the delivery amount to the next process becomes a predetermined amount. The kiln 3 is switched to the normal rotation by the signal that has been reached to stop the feeding and is programmed so that a predetermined amount of the material of the next batch is charged.

  In the embodiment of FIG. 1, the material heating and drying apparatus 1 employs a cocurrent heating method in which the material flow and the hot air flow are in the same direction. In this cocurrent heating method, the burner 6 is heated based on the exhaust gas temperature. When the combustion amount is adjusted and controlled, the heating material temperature is also easily controlled. Therefore, the exhaust duct 7 is provided with an exhaust gas temperature sensor 15 for measuring the exhaust gas temperature, and the exhaust gas temperature detected by the exhaust gas temperature sensor 15 and the heating material. The target exhaust gas set temperature is sequentially obtained from the relationship with the temperature, and the combustion amount of the burner 6 is adjusted and controlled based on the difference value between the exhaust gas temperature set value and the exhaust gas detection temperature. It is also possible to control the amount of combustion of the burner 6 from the heating material temperature.

  Next, the case where the material is heated and dried by batch feeding in the rotary kiln type material heating and drying apparatus 1 will be described. First, hot air is supplied into the kiln 3 from the burner 6 while the kiln 3 is rotated forward, while a predetermined amount of material is charged from the belt conveyor 8. The charged material is heated and dried while rolling down in the kiln 3 while being scraped up by the scraping blade 2, and reaches the return blade 10 at the material discharge end of the kiln 3. During rotation, the material is pushed back to the material input side to prevent discharge, and the material is retained in the kiln 3.

  The material that has reached the material discharge side of the kiln 3 is scooped up at the inlet 11 a of the material circulation pipe 11 and dropped into the material circulation pipe 11, and the circulation pipe 11 is caused by the gravity of the material as the kiln 3 rotates. It moves inside and is circulated into the kiln 3 from the outlet 11b of the circulation pipe 11, and is raked up again by the scraping blade 2 and is heated and dried while coming into contact with hot air while falling into a bale.

  Further, the material staying in the kiln 3 is detected by the temperature sensor 14 and taken into the kiln rotation controller 13, the heating material temperature reaches a predetermined set temperature, and if there is a material supply request for the next process, the kiln The kiln 3 is switched to reverse rotation by the rotation controller 13. When the kiln 3 rotates in reverse, the return blade 10 exerts the action of feeding the heating material in the kiln 3 out of the kiln 3, so that the heating material is scraped up by the scraping blade 2 having a scraping function even when the kiln reversely rotates. It rolls down in the kiln 3 and is discharged from the discharge port 9 and sent to the next process.

  When a predetermined amount of the heating material is sent to the next process, a supply stop signal is sent to the kiln rotation controller 13, and the kiln rotation controller 13 switches the kiln 3 to the normal rotation, thereby discharging the kiln 3 material. The return blade 10 on the side pushes the material back to the material input side to prevent discharge, and the next batch of material is input into the kiln 3. By repeating this, the kiln 3 supplies the heating material to the next process by batch feeding.

  In addition, in the case of heating and drying the material by continuous feeding in the rotary kiln type material heating and drying apparatus, in order to control the heating material to a predetermined temperature even at the beginning of operation when the material supply and burner combustion state is not stable, First, at the start of operation, similarly to the batch feed, when the kiln 3 is rotated forward and the material is scraped up and heated by the blade 2 and reaches the return blade 10 on the material discharge side of the kiln 3, the return blade 10 As a result, the material is pushed back to the material input side to prevent discharge, the material is retained in the kiln 3, and a part of the material is circulated through the material circulation pipe 11. Then, the heating material temperature detected by the temperature sensor 14 is taken into the kiln rotation controller 13, and when the heating material temperature reaches a predetermined set temperature, the kiln rotation controller 13 switches the kiln 3 to reverse rotation. As a result, the return blade 10 feeds the heating material in the kiln 3 out of the kiln 3, and continuously supplies the material to the next process.

  In this way, the material can be retained and discharged freely by switching the forward / reverse rotation of the kiln 3 and batch feed can be performed, and a continuous feed rotary kiln can be employed in batch equipment. Further, the material on the material discharge side of the kiln 3 is circulated to the material input side via the material circulation pipe 11, thereby increasing the amount of scraping by the scraping blade 2 and increasing the chance of contact with hot air, thereby increasing the kiln 3. The heating efficiency can be improved. Moreover, the heating material can be controlled to a predetermined temperature by staying in the kiln 3 until the heating material reaches a predetermined temperature, and the heating material can be kept at a predetermined temperature even at the beginning of operation when the material supply amount and the combustion state of the burner 6 are not stable. The quality can be secured even for the manufacture of products that require severe temperature control.

  FIG. 5 shows another embodiment of the material circulating means. In FIG. 5, the same reference numerals as those in FIG. 4 denote the same components, and the description thereof will be omitted. The kiln 3 is formed into a double cylinder shape including an inner cylinder 16 and an outer cylinder 17, and a partition plate 18 is disposed between the inner cylinder 16 and the outer cylinder 17 in a spiral shape along the kiln length direction to form a material circulation passage 19. In the same manner as in the first embodiment, an inlet 19a and an outlet 19b, which are outlets for materials in the kiln 3, are formed at both ends of the material circulation passage 19. Then, when the kiln 3 rotates in the positive direction indicated by the arrow direction, the material discharge side material of the kiln 3 is dropped into the material circulation passage 19 from the inlet 19a, and the inside of the material circulation passage 19 is rotated along with the rotation of the kiln 3. It is moved in the direction of the arrow by gravity, discharged from the outlet 19b of the kiln 3 and circulated to the material input side. With this material circulation means, a larger amount of material can be circulated than the material circulation pipe 11 of the first embodiment.

  In the above embodiment, a cocurrent heating method is employed in which hot air is supplied to the material flowing down in the kiln 3 and heated in the same direction, but countercurrent heating in which the material and hot air flow in opposite directions to each other is adopted. Of course, the method may be adopted.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic explanatory drawing partly notched which shows one Example of the rotary kiln type material heating drying apparatus which concerns on this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. FIG. 2 is a perspective view in which a part of FIG. 1 is omitted. It is a perspective view of another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Material heating drying apparatus 2 ... Scraping blade 3 ... Kiln 5 ... Drive motor 6 ... Burner 8 ... Belt conveyor 9 ... Discharge port 10 ... Return blade 11 ... Circulation pipe (material circulation means) 11a ... Inlet part 11b ... Outlet part DESCRIPTION OF SYMBOLS 12 ... Cover for prevention 13 ... Kiln rotation controller 14 ... Temperature sensor 15 ... Exhaust gas temperature sensor 16 ... Inner cylinder 17 ... Outer cylinder 18 ... Partition plate 19 ... Material circulation path (material circulation means) 19a ... Inlet part 19b ... Outlet Part

Claims (4)

  A cylindrical kiln having a plurality of scraping blades on the inner periphery is supported in an inclined manner, and hot air is blown from a burner disposed on one end side of the kiln while rotating the kiln at a predetermined speed by a driving motor. In the rotary kiln-type material heating and drying apparatus that heats the material supplied into the kiln to a predetermined temperature while rolling down the kiln while scooping up the material supplied to the kiln, the drive motor that rotates the kiln is a positive motor. The scraper blade is configured to be capable of scraping the material during both forward and reverse rotations of the kiln, and the material discharge side of the kiln is configured to feed the material during the forward rotation of the kiln. A return vane is provided to push the material back to prevent discharge and to push the material out of the kiln during reverse rotation of the kiln, while restricting forward and reverse rotation of the drive motor of the kiln. Kiln rotation controller comprises a and rotary kiln type material heating and drying apparatus, characterized in that arranged the material circulation means for circulating the material of the material discharge side of the kiln to the material input side during forward rotation of the kiln to be.   The material circulation means includes a material circulation pipe having a predetermined diameter on the outer periphery of the kiln and spirally disposed along the length of the kiln, and connects one end of the material circulation pipe to the material discharge side of the kiln, while the other end is connected to the kiln. Connected to the material input side, the kiln material discharge side material is dropped into the material circulation pipe during the forward rotation of the kiln, and moved in the material circulation pipe as the kiln rotates to circulate to the material input side The rotary kiln-type material heating and drying apparatus according to claim 1.   The kiln has a double cylinder shape composed of an inner cylinder and an outer cylinder, and a partition plate is helically disposed along the kiln length direction between the inner cylinder and the outer cylinder to form a material circulation path, At the both ends of the material circulation passage, material entrances and exits are formed in the kiln, and the material discharge side material of the kiln is dropped into the material circulation passage during the forward rotation of the kiln, and inside the material circulation passage as the kiln rotates. The rotary kiln-type material heating and drying apparatus according to claim 1, wherein the rotary kiln type material heating and drying apparatus is configured to be moved and circulated to the material charging side.   A temperature sensor for measuring the temperature of the heated material is provided on the material discharge side of the kiln, the temperature detected by the temperature sensor is taken into the kiln rotation controller, and when the material supply to the kiln is started, the kiln is rotated forward to flow down in the kiln. The material is pushed back by the return vane on the kiln discharge side and heated while staying in the kiln, and when the temperature detected by the temperature sensor reaches a predetermined temperature, the kiln rotation controller controls switching the kiln from forward rotation to reverse rotation. 4. The rotary kiln type material heating and drying apparatus according to claim 1, wherein the heating material is sent out of the kiln.

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