JP2008241218A - Rotary kiln type high temperature treating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary kiln type high temperature treating device suppressing the damage and degradation of a refractory layer to extend a service life of a furnace body by accurately measuring the internal temperature of the furnace body to carry out operation. <P>SOLUTION: The rotary kiln type high temperature treating device has the furnace body 2 rotated around an axis and charged with a treated material inside; a combustion burner for burning the treated material inside the furnace body 2; a temperature measuring means 4 for measuring the internal temperature of the furnace body 2; and a control means 5 adjusting at least one of the charged quantity of the treated material or the burning state of the combustion burner based on the measured value of the temperature measuring means 4 to control the internal temperature of the furnace body 2. The temperature measuring means 4 has a plurality of temperature sensors 12A, 12B, 12C, 12D, and the plurality of temperature sensors 12A, 12B, 12C, 12D are disposed at circumferential spaces in the same position in the axial direction of the furnace body 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary kiln-type high-temperature processing apparatus in which an object to be processed such as scrap with combustible material is put into a furnace body, and the object to be processed is burned and melted inside the furnace body.

  High temperature processing of an object to be processed by the above rotary kiln type high temperature processing apparatus is widely provided as an effective method for processing industrial waste and the like. For example, when industrial waste containing metals such as automobile shredder dust and waste home appliances is treated at high temperature, combustibles such as urethane are gasified from the materials to be treated that are put into the furnace body. And incombustible material containing metal is melted to form molten slag. The molten slag formed here is discharged from the outlet of the melting furnace, cooled with water by a cooler and crushed to produce a crushed lump. And useful or expensive metals, such as copper (Cu), gold | metal | money (Au), silver (Ag), etc. are collect | recovered from the produced | generated crushed lump. On the other hand, the generated gas is burned to a high temperature in the secondary combustion chamber, and malodorous substances are decomposed and discharged from the secondary combustion chamber. Then, it is discharged into the atmosphere through a heat exchange process, a quench process, a dust / toxic gas removal process, and the like.

  In such a rotary kiln-type high-temperature treatment apparatus, the furnace main body is brought into a high temperature state of, for example, about 1200 ° C. due to combustion by the combustion burner, and therefore the furnace main body supports the refractory layer that can withstand high temperatures and the refractory layer. It has a double structure with the furnace shell. Since the refractory layer is placed in a high-temperature atmosphere as described above, it is possible to extend the life of the furnace body by suppressing damage and deterioration of the refractory layer.

Since the refractory layer may crack due to a volume change due to a temperature change, keeping the temperature stable is effective in suppressing damage to the refractory layer. Therefore, conventionally, operations have been performed so that the internal temperature of the furnace body is estimated or measured to stabilize the internal temperature. For example, Patent Document 1 discloses a method of operating by estimating the internal temperature of the furnace body from the kiln outlet temperature, and Patent Documents 2 and 3 include a method of measuring the internal temperature of the furnace body using a radiation thermometer. Has proposed a method of measuring the internal temperature of the furnace body using a thermocouple, a resistance temperature detector, or the like.
JP 2004-20105 A Japanese Patent Application Laid-Open No. 08-29260 Japanese Patent Laid-Open No. 10-332124 JP 2004-111990 A

  By the way, since the method described in Patent Document 1 does not directly measure the internal temperature of the furnace body, temperature control cannot be performed with high accuracy. In addition, in the methods described in Patent Documents 2 and 3, since a radiation thermometer is used, accurate temperature measurement becomes difficult when the inside of the furnace body is clouded with dust or the like.

In the method described in Patent Document 4, since a thermocouple, a resistance temperature detector, and the like are arranged inside the furnace body and directly measured, accurate temperature measurement can be performed. However, since thermocouples, resistance temperature detectors, and the like are placed under a high temperature condition, they are deteriorated inside the furnace body and cannot be measured. In order to replace thermocouples, resistance thermometers, etc., it is necessary to temporarily stop the operation of the rotary kiln, but this replacement operation reduces the operation efficiency and deteriorates the refractory layer due to temperature changes. .
In addition, when so-called `` casting '' occurs where metal or the like adheres to the place where the thermocouple or resistance temperature detector is placed, the temperature drops only at that part or the sensitivity becomes dull, An abnormal value was measured as the internal temperature of the furnace body, and there was a risk that proper operation could not be performed.

  The present invention has been made in view of the above-described situation, and by measuring the internal temperature of the furnace body accurately and operating based on this measurement value, it is possible to suppress damage and deterioration of the refractory layer. An object of the present invention is to provide a rotary kiln-type high-temperature treatment apparatus capable of extending the life of a furnace body.

  In order to solve this problem, a rotary kiln-type high-temperature treatment apparatus according to the present invention includes a furnace body that is rotated around an axis and into which the workpiece is placed, and a combustion that burns the workpiece within the furnace body. Burner, temperature measuring means for measuring the internal temperature of the furnace main body, and furnace body by adjusting at least one of the input amount of the workpiece or the combustion state of the combustion burner based on the measured value of the temperature measuring means Control means for controlling the internal temperature of the furnace, and the temperature measuring means has a plurality of temperature sensors, and the plurality of temperature sensors are circumferentially arranged at the same position in the axial direction of the furnace body. It is characterized by being arranged at intervals.

In the rotary kiln-type high-temperature treatment apparatus having this configuration, since the plurality of temperature sensors are arranged at intervals in the circumferential direction at the same position in the axial direction of the furnace body, the plurality of temperature sensors are located at the same position in the axial direction. The temperature will be measured. Here, since the furnace body is rotated around the axis, each of the plurality of temperature sensors is rotated around the axis, and the internal temperature of the furnace body can be similarly measured by each temperature sensor. Therefore, even if one temperature sensor fails, the temperature can be controlled by measuring the temperature with another temperature sensor without stopping the operation for repairing the temperature sensor, and the refractory layer can be damaged or deteriorated. It is possible to extend the life of the furnace main body.
In addition, since it is possible to measure the temperature distribution in the circumferential direction inside the furnace body with these multiple temperature sensors, when "casting" occurs in part and abnormal values are measured by one temperature sensor However, it can operate based on the measured values of other temperature sensors.

Here, the plurality of temperature sensors may be arranged so that the temperature sensing parts are located on the same circumference centered on the axis.
In this case, the rotation trajectories around the axes of the temperature sensing parts of the plurality of temperature sensors coincide with each other, and the temperature inside the furnace body can be accurately measured by the plurality of temperature sensors.

Further, at least one of the plurality of temperature sensors may be arranged such that the temperature sensing part is in a position retracted radially outward with respect to the temperature sensing parts of the remaining temperature sensors.
In this case, since the temperature sensing part of one temperature sensor is arranged to recede radially outward from the temperature sensing part of the other temperature sensor, the temperature distribution in the radial direction of the inner peripheral wall of the furnace body, that is, The temperature distribution in the thickness direction of the refractory layer can be measured. Therefore, the deterioration state of the refractory can be grasped without stopping the operation, and the refractory layer can be repaired at an appropriate time. This makes it possible to extend the life of the furnace body.

  According to the present invention, there is provided a rotary kiln type high temperature treatment apparatus capable of suppressing damage and deterioration of a refractory layer and extending the life of a furnace body by accurately measuring and operating the temperature inside the furnace body. Can be provided.

Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. 1 and 2 show a rotary kiln-type high-temperature treatment apparatus according to the first embodiment of the present invention.
The rotary kiln-type high-temperature treatment apparatus 1 includes a furnace body 2 that treats the workpiece W at a high temperature, a combustion burner 3 that burns inside the furnace body 2, and a temperature measurement unit 4 that measures the internal temperature of the furnace body 2. The control unit 5 that controls the operating state of the furnace body 2 based on the temperature data measured by the temperature measuring means 4, the input unit 6 that inputs the workpiece W into the furnace body 2, and the furnace body 2 The secondary combustion chamber 7 into which the exhaust gas G to be introduced is introduced, and the cooler 8 that cools the slag S generated inside the furnace body 2 are provided.
Here, examples of the workpiece W include automobile shredder dust, waste home appliances, printed circuit boards, and sludge.

The furnace body 2 has a cylindrical shape extending along the axis L, and a lid portion 9 is provided on the upstream end surface, and the combustion burner 3 and the charging portion 6 are disposed on the lid portion 9. . Further, the downstream end face is opened and communicated with the secondary combustion chamber 7 and the cooler 8.
The furnace body 2 is formed of, for example, a steel material and has a cylindrical furnace body shell 10 along the axis L, and a refractory layer 11 disposed so as to be laminated on the inner peripheral surface of the furnace body shell 10. And. In the present embodiment, the thickness t1 of the furnace shell 10 is set to 50 mm ≦ t1 ≦ 400 mm, and the thickness t2 of the refractory layer 11 is set to 100 mm ≦ t2 ≦ 300 mm.

The temperature measuring means 4 for measuring the internal temperature of the furnace body 2 includes a plurality of thermocouples 12, and the plurality of thermocouples 12 are spaced apart in the circumferential direction at the same position in the axis L direction of the furnace body 2. They are spaced at regular intervals. In this embodiment, as shown in FIG. 2, four thermocouples 12 of a first thermocouple 12A, a second thermocouple 12B, a third thermocouple 12C, and a fourth thermocouple 12D are arranged at 90 ° intervals in the circumferential direction. It is installed. Here, the radial positions of the temperature sensitive portions 13A, 13B, 13C, 13D (tip portions) of the plurality of thermocouples 12A, 12B, 12C, 12D are arranged on the same circumference with the axis L as the center. .
The temperature measuring means 4 includes a transmitter 14 disposed in the furnace body 2, and the transmitter 14 sequentially measures temperature data measured while rotating around the axis L together with the furnace body 2. 5 is configured to transmit to the receiver 15 disposed in the circuit 5.

  The control unit 5 has a receiver 15 that receives temperature data measured by the temperature measuring means 4 and transmitted by the transmitter 14, and based on this temperature data, the input unit 6 and the combustion of the workpiece W A command is given to the burner 3 to adjust the internal temperature of the furnace body 2. Specifically, when the internal temperature of the furnace body 2 decreases, combustion in the furnace body 2 is promoted by increasing the input amount of the workpiece W or increasing the gas supply amount to the combustion burner 3. On the other hand, when the internal temperature of the furnace body 2 rises, combustion in the furnace body 2 is suppressed by reducing the input amount of the workpiece W or reducing the gas supply amount to the combustion burner 3.

The secondary combustion chamber 7 is provided with a secondary burner (not shown) for further burning the exhaust gas G discharged from the furnace body 2.
The cooler 8 includes water cooling means (not shown) for cooling the slag S composed of non-combustible components (metal or the like) dissolved in the furnace body 2.

Next, the high temperature processing method of the to-be-processed object W by this rotary kiln type | mold high temperature processing apparatus 1 is demonstrated.
While rotating the furnace main body 2 centering on the axis L, the combustion burner 3 is ignited and the inside of the furnace main body 2 is heated to about 800-1200 degreeC. Further, the secondary burner in the secondary combustion chamber 7 is ignited and the cooling water is circulated to the water cooling means of the cooler 8.

In this state, the workpiece W is charged into the furnace body 2 by the charging unit 6. Then, the workpiece W introduced into the furnace body 2 is decomposed and burned and gasified in the furnace body 2 at a high temperature, and the incombustible component containing metal is in a molten state or half The molten slag S is obtained.
The generated gas component is sent from the downstream opening of the furnace body 2 to the secondary combustion chamber 7. The exhaust gas G sent to the secondary combustion chamber 7 is further supplied with hot air and air from the secondary burner in the secondary combustion chamber 7 and burned to a high temperature, and is treated as a combustion gas from the exhaust port (shown in the figure). None).
In addition, the slag S generated inside the furnace body 2 flows down from the downstream opening of the furnace body 2, is cooled by the cooler 8, and is crushed. Thereby, a crush is formed. The obtained crush is separated into a metal crush and a slag S crush using, for example, a magnetic beneficiation apparatus (not shown), and useful metal components are recovered.

  According to the rotary kiln-type high-temperature treatment apparatus 1 that is the first embodiment of the present invention having such a configuration, a plurality of thermocouples 12 </ b> A, 12 </ b> B, 12 </ b> C, 12 </ b> D are attached to the furnace body 2 that is rotated around the axis L. Are arranged at intervals in the circumferential direction at the same position in the axis L direction of the furnace body 2, so that the internal temperature of the furnace body 2 is similarly measured by the plurality of thermocouples 12A, 12B, 12C, 12D. Can do. Thus, for example, even if the first thermocouple 12A is deteriorated, the remaining second, third, and fourth thermocouples 12B, 12C, and 12D do not stop the operation to repair the first thermocouple 12A. 2 can be measured to control the temperature, and damage and deterioration of the refractory layer 11 can be suppressed.

  In particular, in the present embodiment, the plurality of thermocouples 12A, 12B, 12C, and 12D are arranged so that the temperature sensitive portions 13A, 13B, 13C, and 13D are located on the same circumference with the axis L as the center. Therefore, the rotation trajectories around the axis L of the temperature sensing parts 13A, 13B, 13C, 13D of the plurality of thermocouples 12A, 12B, 12C, 12D coincide with each other, and the plurality of thermocouples 12A, 12B, The internal temperature of the furnace body 2 can be accurately measured by 12C and 12D.

  Moreover, it becomes possible to measure the temperature distribution in the circumferential direction inside the furnace body 2 by using the plurality of thermocouples 12A, 12B, 12C, and 12D. For this reason, for example, even when metal or the like adheres to the tip portion of the first thermocouple 12A, so-called “casting” occurs, and only the temperature data of the first thermocouple 12A decreases, resulting in an abnormal value. It is possible to perform an appropriate operation based on the temperature data of the remaining second, third, and fourth thermocouples 12B, 12C, and 12D.

  Further, in the present embodiment, a plurality of thermocouples 12A, 12B, 12C, and 12D are disposed in the furnace body 2, but these temperature data are transmitted from the transmitter 14 disposed in the furnace body 2 to the control unit 5. Therefore, the thermocouple 12 may be disposed along the outer peripheral surface of the furnace body 2 rotated about the axis L, and the plurality of thermocouples 12A, 12B, 12C, and 12D are disposed. Can be easily performed.

Next, a second embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 3 shows a rotary kiln-type high-temperature treatment apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and detailed description is abbreviate | omitted.
In this rotary kiln type high temperature processing apparatus 1, the arrangement of the plurality of thermocouples 12 provided in the temperature measuring means 4 is different from that of the first embodiment.

  More specifically, in the second embodiment, as shown in FIG. 3, the first, second, third, and fourth thermocouples 12A, 12B, 12C, and 12D are circumferential in the same position in the axis L direction. The temperature sensitive portions 13A, 13B, 13C, and 13D (tips of the thermocouples 12A, 12B, 12C, and 12D) have different radial positions. 12 A of 1st thermocouples are arrange | positioned so that the temperature sensitive part 13A may be exposed to the internal peripheral surface of the refractory material layer 11. FIG. The second thermocouple 12B is disposed inside the refractory layer 11 with its temperature sensing part 13B slightly retracted radially outward from the temperature sensing part 13A of the first thermocouple 12A. Is disposed in a portion that is recessed from the inner peripheral surface of the refractory layer 11 by about 1/4 of the thickness of the refractory layer 11. The third thermocouple 12C is disposed inside the refractory layer 11 with the temperature sensing portion 13C retracting further radially outward than the temperature sensing portion 13B of the second thermocouple 12B. The refractory layer 11 is disposed at a portion retreated from the inner peripheral surface of the physical layer 11 by about ½ of the thickness of the refractory layer 11. The fourth thermocouple 12D is disposed at the boundary between the refractory layer 11 and the furnace shell 10 with its temperature sensing portion 13D receding radially outward from the temperature sensing portion 13C of the third thermocouple 12C. Yes.

  According to the rotary kiln-type high-temperature processing apparatus 1 that is the second embodiment of the present invention configured as described above, the first thermocouple 12A, the second thermocouple 12B, the third thermocouple 12C, and the fourth thermocouple 12D. Since the temperature-sensitive parts 13A, 13B, 13C, and 13D have different radial positions, the temperatures at the different positions are measured, but the difference between these temperature data is controlled to be constant. By doing so, it becomes possible to stabilize the internal temperature of the furnace body 2 and to suppress the damage and deterioration of the refractory layer 11 and to extend the life of the furnace body 2.

  Further, it becomes possible to measure the temperature distribution in the radial direction of the furnace body 2, that is, the temperature distribution in the thickness direction of the refractory layer 11, and grasp the deterioration state of the refractory layer 11 without stopping the operation. can do. For example, the refractory layer 11 is gradually worn by operation, but the temperature difference between the first thermocouple 12A and the second thermocouple 12B is reduced according to the degree of wear. As wear further progresses, the temperature difference between the second thermocouple 12B and the third thermocouple 12C becomes smaller. Thus, the wear state of the refractory layer 11 can be grasped by measuring the temperature difference between the plurality of thermocouples 12A, 12B, 12C, and 12D. Therefore, the refractory layer 11 can be repaired at an appropriate time, and the life of the furnace body 2 can be extended. Further, it is not necessary to stop the operation and cool the furnace body 2 in order to confirm the deterioration state of the refractory layer 11, and it is possible to extend the life by reducing the thermal shock to the refractory layer 11. It becomes.

The rotary kiln-type high-temperature treatment apparatus according to the embodiment of the present invention has been described above, but the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention.
For example, the temperature measuring means has been described as including a plurality of thermocouples, but the present invention is not limited to this, and other temperature sensors such as a resistance temperature detector may be used. Further, although four thermocouples have been described as being arranged at intervals of 90 ° in the circumferential direction, the number of thermocouples may be two or more, and it is preferable to set in consideration of the size of the furnace body and the like.

Moreover, in 2nd Embodiment, although demonstrated as what was arrange | positioned so that the radial direction position of the thermosensitive part of four thermocouples might mutually differ, it is not limited to this, Of several thermocouples What is necessary is just to be comprised so that the radial direction position of the temperature sensing part of at least 1 thermocouple may differ.
Furthermore, as a to-be-processed object, it is not limited to what was illustrated to embodiment, Other wastes etc. may be sufficient.

It is explanatory drawing which shows the rotary kiln type | mold high temperature processing apparatus which is the 1st Embodiment of this invention. It is a cross-sectional explanatory drawing of the rotary kiln-type high temperature processing apparatus shown in FIG. It is sectional explanatory drawing of the rotary kiln type | mold high temperature processing apparatus which is the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary kiln type high temperature processing apparatus 2 Furnace body 3 Combustion burner 4 Temperature measuring means 5 Control part (control means)
12 Thermocouple (temperature sensor)

Claims (3)

A furnace body rotated about an axis and into which the workpiece is introduced; a combustion burner for burning the workpiece within the furnace body; a temperature measuring means for measuring the internal temperature of the furnace body; and Control means for controlling the internal temperature of the furnace body by adjusting at least one of the input amount of the workpiece or the combustion state of the combustion burner based on the measured value of the temperature measuring means,
The temperature measuring means includes a plurality of temperature sensors, and the plurality of temperature sensors are arranged at intervals in the circumferential direction at the same position in the axial direction of the furnace body. Rotary kiln type high temperature processing equipment.   The rotary kiln type high temperature processing apparatus according to claim 1, wherein the plurality of temperature sensors are respectively arranged such that their temperature sensing parts are located on the same circumference centered on the axis.   At least one of the plurality of temperature sensors is arranged such that the temperature sensing part is located at a position retracted radially outward with respect to the temperature sensing parts of the remaining temperature sensors. The rotary kiln type high temperature processing apparatus according to claim 1.

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