Structure, method of using rotary kiln device, and method of manufacturing structure

Abstract

Provided is a feature pertaining to a structure provided with an arrangement member that is disposed inside a cylindrical furnace of a rotary kiln device, the arrangement member serving the purpose of adjusting the state of a to-be-processed object and protecting the inner peripheral surface of the furnace.　In a structure 3 disposed inside a cylindrical furnace 2 of a rotary kiln device 1, a plurality of component members 31, 32 including arrangement members 31, 32 that are disposed for the purpose of adjusting the state of a to-be-processed object PO or for the purpose of protecting the inner peripheral surface of the furnace 2 support each other without being joined to each other, thereby arranging the arrangement members 31, 32 along the inner peripheral surface of the furnace 2.

Description

[Technical field]

[0001] The present invention relates to a structure for adjusting the condition of an object to be treated in a rotary kiln and for protecting the inner peripheral surface of the furnace body. [Background technology]

[0002] For example, direct heating rotary kiln (RK) equipment, which heats the inside of the furnace with a burner and processes materials in a high-temperature atmosphere for incineration of waste, firing of inorganic materials such as ceramics, and firing of contaminated soil, some of which are equipped with stirring blades to stir the materials being treated.

[0003] For example, in the furnace body of a direct heating type RK device, there are regions where the temperature reaches as high as about 400 to 1300° C., so the inner circumferential surface of the furnace body is usually covered with a castable refractory material. In this case, for example, a method is adopted in which a reinforcing anchor is attached to the inner circumferential surface of the furnace body via an anchor fixing member, and castable refractory material is molded around the reinforcing anchor to form a lifter that protrudes toward the inside of the furnace (for example, Patent Documents 1 and 2).

[0004] However, in a direct heating RK device where the inside of the furnace body becomes very hot, the difference in thermal expansion coefficient between the reinforcing anchors made of metal, for example, and the monolithic refractory becomes large. This causes a problem in that the thermal expansion of the reinforcing anchors embedded inside the device makes it easier for cracks to progress in the surrounding monolithic refractory.

[0005] On the other hand, Patent Document 3 describes a lifter member that includes a plurality of radially arranged first fins and a plurality of second fins that connect a pair of circumferentially adjacent first fins and are arranged such that one circumferential end and the other circumferential end are shifted from each other in the axial direction. This lifter member is disposed inside the tube of a rotary kiln, and when the lifter member rolls in association with the rotation of the tube, the first fins agitate the workpiece, and the second fins control the transport speed of the workpiece in the axial direction of the tube.

[0006] However, Patent Document 3 clearly states that the lifter member is intended for use only in externally heated rotary kilns. The reason for this limitation is not clearly stated in Patent Document 3, but it is stated that it is preferable to configure the lifter member from metal, and it can be presumed that the use of a metal member under the harsh temperature conditions of about 400 to 1300°C, as described above, was not anticipated.

[0007] As confirmed above, in an RK device whose inside becomes hot, the method described in Patent Documents 1 and 2 in which a molded refractory material is molded around a reinforcing anchor can be understood to be common technical knowledge regarding the installation of an agitating blade. Furthermore, Patent Document 3 does not disclose a specific configuration of an agitating blade that can be used in a directly heated RK device. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 4-292785 [Patent Document 2] JP 2005-24137 A [Patent Document 3] JP 2009-103345 A Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made against this background, and provides a technology relating to a structure that is equipped with arrangement members that are placed inside the cylindrical furnace body of a rotary kiln apparatus to adjust the condition of the material to be treated and to protect the inner surface of the furnace body. [Means for solving the problem]

[0010] The present invention 1. The structure is a structure to be disposed in a cylindrical furnace body of a rotary kiln apparatus, A gas supply pipe is provided in the furnace body for the purpose of adjusting the condition of the material to be treated. Can A plurality of components including the arrangement member are supported by each other in a non-bonded state, so that the arrangement member is arranged along the inner circumferential surface of the furnace body. 、 the arrangement member has a first protruding surface arranged toward the axial direction of the cylindrical furnace body, and is a weir member for adjusting the state of the movement by holding back a part of the object to be treated moving along the axial direction with the first protruding surface, The constituent members include a plurality of the dam members and a plurality of first holding members for holding the plurality of dam members at intervals along the axial direction of the furnace body. It is characterized by: In this case, the first holding member has a second protruding surface arranged in a direction intersecting the radial direction of the cylindrical furnace body, moves along the circumferential direction of the furnace body as the furnace body rotates, and is configured as the positioning member for adjusting the stirring state of the object to be treated by lifting a portion of the object to be treated with the second protruding surface and then dropping it, and the dam member may be a plurality of the stirring members and a plurality of second holding members for holding the plurality of stirring members at intervals from each other along the circumferential direction of the inner surface of the furnace body.

[0011] The second structure of the present invention is a structure to be placed in a cylindrical furnace body of a rotary kiln apparatus, A plurality of components, including a placement member arranged for the purpose of protecting the inner circumferential surface of the furnace body, are supported by each other in a state where they are not joined together, so that the placement member is arranged along the inner circumferential surface of the furnace body; The arrangement member is a metal protective wall member arranged to cover the inner circumferential surface of the furnace body along the circumferential direction, The component member is characterized in that it is composed of a plurality of the protective wall members.

[0012] The structure may have the following features: ( a ) The furnace is placed in an area where the temperature is within the range of 400 to 1300°C. ( b 1.) The components are made of metal.

[0013] Next, the first invention of the method of using the rotary kiln apparatus is as follows: A step of operating the rotary kiln apparatus with the first structure disposed in a furnace body and supplying a material to be treated to the furnace body; and adjusting the movement of the object to be treated by using the dam member to stop the movement of a part of the object to be treated. The second invention relates to a method of using the rotary kiln apparatus. A step of operating the rotary kiln apparatus in a state in which the first structure in which the first holding member is configured as an agitating member is disposed in a furnace body, and supplying a processing object to the furnace body; The method further includes a step of rotating the structure in association with the rotation of the furnace body, and stirring the object to be treated by the stirring member. The third invention relates to a method of using a rotary kiln apparatus. In the furnace body, Second The method includes a step of operating the rotary kiln apparatus with the above-mentioned structure in place, supplying an object to be treated to the furnace body with the inner circumferential surface of the furnace body covered by the protective wall member, and treating the object to be treated.

[0014] In addition, a rotary kiln is installed in a cylindrical furnace body. 1. The invention relating to a method for manufacturing a structure is: A gas supply pipe is provided in the furnace body for the purpose of adjusting the condition of the material to be treated. Can The method includes forming the structure such that a plurality of components including a placement member are supported by each other in a non-bonded state, and the placement member is placed along the inner circumferential surface of the furnace body. fruit, The arrangement member is configured as a weir member having a first protruding surface that adjusts the state of the movement by holding back a part of the object to be processed moving along the axial direction, In the step of forming the structure, the plurality of dam members are held at intervals along the axial direction of the furnace body by the plurality of first holding members, which are the constituent members, and the first protruding surfaces of the dam members are arranged so as to face the axial direction of the cylindrical furnace body. It is characterized by: In this case, the first holding member is an agitating member configured as the positioning member having a second protruding surface that moves along the circumferential direction of the furnace body as the furnace body rotates, and adjusts the agitation state of the object to be treated by lifting up a portion of the object to be treated and then dropping it, and in the process of forming the structure, the multiple second holding members, which are the dam members, hold the multiple agitating members at intervals along the circumferential direction of the inner surface of the furnace body, and may be positioned so that the second protruding surface of each of the agitating members faces in a direction intersecting the radial direction of the cylindrical furnace body.

[0015] Next, the invention relating to a manufacturing method of a second structure to be placed in a cylindrical furnace body of a rotary kiln apparatus is as follows: A step of forming the structure such that a plurality of components, including a placement member arranged for the purpose of protecting the inner circumferential surface of the furnace body, are supported by each other in a state of not being joined to each other, and the placement member is arranged along the inner circumferential surface of the furnace body; The arrangement member is configured as a protective wall member made of metal, The step of forming the structure is characterized in that a plurality of the protective wall members are arranged so as to cover the inner circumferential surface of the furnace body along a circumferential direction. Effect of the Invention

[0016] In the present invention, a plurality of components, including a placement member for adjusting the state of the material to be treated supplied into the cylindrical furnace body of a rotary kiln apparatus or for protecting the inner peripheral surface of the furnace body, are supported in a state of being unconnected to each other, and the placement member is placed along the inner peripheral surface of the furnace body. According to this configuration, since welding between the components or bolt-nut fastening are not used, residual stress and structural degeneration during processing of each component are small. Therefore, even in a high-temperature atmosphere inside the furnace body of a rotary kiln apparatus, each component is unlikely to be subjected to stress concentration due to thermal expansion, and damage to the components can be avoided, and the state of the material to be treated can be stably adjusted and the inner peripheral surface of the furnace body can be protected. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a configuration diagram of a rotary kiln apparatus. [Diagram 2] 1 is a transparent perspective view showing a state in which a stirring mechanism, which is one embodiment of a structure of the present invention, is disposed inside a furnace body. [Diagram 3] FIG. 4 is an enlarged perspective view showing the fitting structure of the stirring blade and the frame member. [Figure 4] 4 is a schematic diagram showing a state in which a stirring mechanism thermally expands due to heating. FIG. [Diagram 5] FIG. [Figure 6] 11A to 11C are diagrams illustrating the operation of a stirring mechanism according to a second embodiment. [Figure 7] FIG. 11 is a perspective view showing a state in which a stirring mechanism according to a third embodiment is disposed in a furnace body. [Figure 8] FIG. 11 is an external perspective view of a stirring mechanism according to a third embodiment. [Figure 9] FIG. 2 is an enlarged perspective view showing the structures of the stirring blade, the frame member, and the protective wall member. [Figure 10] 13A to 13C are diagrams illustrating the operation of a stirring mechanism according to a fourth embodiment. [Figure 11] FIG. 13 is an external perspective view of a stirring mechanism according to a fourth embodiment. [Figure 12] FIG. 13 is an external perspective view of components of a stirring mechanism according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, as a first embodiment of a structure of the present invention, an agitation mechanism 3 having a function of adjusting the state of agitation and movement of an object to be processed will be described with reference to the drawings. 1 shows a configuration example of a rotary kiln (RK) apparatus 1 in which an object to be treated is stirred using the stirring mechanism 3 of this embodiment. The RK apparatus 1 can be configured as an incineration apparatus for incinerating waste, a calcination apparatus for calcining inorganic materials, or a calcination apparatus for calcining contaminated soil. In these cases, the waste, inorganic materials, and contaminated soil correspond to the object to be treated in this embodiment.

[0019] The RK apparatus 1 shown in FIG. 1 includes a furnace body 2 in which the material to be treated PO is treated, a supply section 11 that supplies the material to be treated PO to the furnace body 2, a burner 14 that directly heats the inside of the furnace body 2, and a drive mechanism that rotates the furnace body 2.

[0020] For example, the furnace body 2 is configured by covering the inner peripheral surface of a cylindrical steel material with a fireproof wall. There is no particular limitation on the dimensions of the furnace body 2, but when incinerating waste or burning inorganic materials or contaminated soil, a configuration of about 1 to 7 meters in diameter and about 4 to 120 meters in total length can be exemplified.

[0021] The fireproof wall can be, for example, a structure in which heat insulating castable and fireproof castable are sequentially laminated on the inner peripheral surface of a steel material to form a lining. In addition, the inner peripheral surface of the furnace body 2 is provided with annular regulating parts 21 and weir parts 22 protruding toward the inside of the furnace body 2 in order to regulate the position of the stirring mechanism 3 and the discharge flow rate of the material to be treated PO. For example, the regulating parts 21 and the weir parts 22 are formed by molding the fireproof castable.

[0022] A supply unit 11 is provided on the inlet side of the furnace body 2 to supply the material to be treated PO into the furnace body 2. FIG. 1 shows an example in which the supply unit 11 is configured with a screw feeder 112. An upstream end of the screw feeder 112 is disposed outside the furnace body 2, and is provided with an inlet 111 through which the material to be treated PO is fed. Meanwhile, a downstream end of the screw feeder 112 is inserted into the furnace body 2 through an opening on the inlet side of the furnace body 2. With this configuration, the material to be treated PO fed into the inlet 111 is transported by the screw feeder 112 and fed to the region on the inlet side of the furnace body 2. The configuration of the supply unit 11 is not limited to the example using the screw feeder 112. For example, a hopper shooter may be directly inserted toward the inlet side of the furnace body 2.

[0023] The inlet opening of the furnace body 2 is covered by a supply side hood 12. The screw feeder 112 described above is disposed so as to penetrate this supply side hood 12. An exhaust pipe 121 is provided on the upper surface of the furnace body 2, and exhaust gas generated in the furnace body 2 is discharged to the outside through this exhaust pipe 121.

[0024] On the other hand, the outlet side opening of the furnace body 2 is covered by a discharge side hood 13. A discharge port 131 is provided at the lower end of the discharge side hood 13, and the material to be treated PO that has flowed out of the outlet side opening of the furnace body 2 beyond the above-mentioned weir portion 22 is discharged to the outside through this discharge port 131.

[0025] A burner 14 is inserted from the side of the discharge hood 13 toward the inside. The tip of the burner 14 is located inside the opening on the outlet side of the furnace body 2. The burner 14 may be configured to burn liquid fuel or gaseous fuel. The material to be treated PO in the furnace body 2 is heated by burning the fuel in the burner 14. At this time, a region is formed in the furnace body 2 where the temperature reaches 400 to 1300°C.

[0026] A pinion 153 is disposed below the furnace body 2. The pinion 153 is engaged with a girth gear 24 that is provided annularly along the outer circumferential surface of the furnace body 2. By rotating the pinion 153 with a driving unit 152 such as a motor, the furnace body 2 can be rotated around its central axis via the girth gear 24. The pinion 153, the driving unit 152, and the girth gear 24 constitute a driving mechanism for the furnace body 2.

[0027] In addition to the girth gear 24 described above, a plurality of annular tire rollers 23 are provided along the outer circumferential surface of the furnace body 2. A plurality of support parts 151 that support the furnace body 2 via these tire rollers 23 are arranged on the lower side of the furnace body 2. The support parts 151 are equipped with rotatable rollers, and as the furnace body 2 rotates, each tire roller 23 can rotate on the rollers of the support parts 151. The plurality of support parts 151 support the furnace body 2 in an inclined state so that the arrangement position becomes lower from the entrance side toward the exit side.

[0028] In the supply unit 11 having the above-mentioned configuration, the furnace body 2 is rotated by the drive mechanism, the inside of the furnace body 2 is heated by the burner 14, and the material to be treated PO is supplied from the supply unit 11. The material to be treated PO moves from the inlet side to the outlet side of the furnace body 2 while being agitated by the rotation of the furnace body 2, and is treated by direct heating of the burner 14 during this period. Then, the material to be treated PO after the treatment passes over the weir part 22 provided on the outlet side of the furnace body 2, and is discharged from the discharge port 131 via the discharge-side hood 13.

[0029] Here, if the agitation of the material PO to be treated by the rotation of the furnace body 2 is insufficient, in the case of incineration, oxygen may not be evenly supplied to the entire material PO to be treated, and in the case of calcination, the material PO to be treated may not be heated to the target temperature at the designed position and then sufficient calcination time may not be secured, which may make it difficult to uniformly proceed with the desired treatment. Therefore, as explained in the background art, the conventional RK device 1 has an agitating blade that protrudes into the furnace by molding an amorphous refractory. As the furnace body 2 rotates, the material PO to be treated is lifted to a higher position by the agitating blade and then falls from the agitating blade, so that the material PO to be treated can be agitated and uniformly treated.

[0030] On the other hand, for example, an anchor structured by molding an amorphous refractory around a metal reinforcing anchor has a large difference in thermal expansion coefficient between the metal and the amorphous refractory. Therefore, the thermal expansion of the reinforcing anchor embedded inside the anchor makes it easier for the surrounding amorphous refractory to crack. For this reason, in the RK device 1, the fireproof wall in the furnace body 2 is frequently reconstructed, which increases the operating cost. Furthermore, in the above-mentioned method, the amorphous refractory must be molded around the reinforcing anchor and then waited until the amorphous refractory is sufficiently dried. For this reason, it may take about one week to perform one construction, which is a factor in significantly reducing the operating rate of the RK device 1.

[0031] Therefore, in the present invention, instead of a method of molding stirring blades on the inner peripheral surface of the furnace body 2 using a moldable refractory, a stirring mechanism 3 is independently arranged inside the furnace body 2. Meanwhile, as described above, in the direct heating type RK device 1, a region where the temperature reaches 400 to 1300°C may be formed in the furnace body 2, and materials that can be arranged in such an environment are limited.

[0032] For example, heat-resistant metal materials can be used under temperature conditions reaching 400 to 1300°C. However, the bolt-nut fastening process usually performed on metal materials adds residual stress, and welding processing causes structural degeneration, so that the lifespan is significantly shortened in high-temperature atmospheres. In addition, in the above-mentioned temperature atmosphere, the strength of the metal material itself is reduced to a fraction of that at room temperature. Furthermore, the thermal expansion of the metal material itself causes a state in which large stress is applied between the members.

[0033] The inventors have thoroughly studied the configuration of the stirring mechanism 3 that can be stably used even under such conditions. As a result, they have found that it is possible to solve the problem of shortening the lifespan of metal materials in a high-temperature atmosphere by forming the stirring mechanism 3 from metal materials without using welding or bolt-nut fastening, and by supporting the components (frame member 31 and stirring blade 32 described below) that make up the stirring mechanism 3 in a state where they are not connected to each other. Here, the "state where the components are not connected to each other" means that the components are not fixedly connected to each other by fastening with bolts and nuts, welding, etc. The stirring mechanism 3 according to this embodiment is configured based on such a technical idea.

[0034] A specific configuration of the stirring mechanism 3 will be described below with reference to Figures 2 and 3. As shown in Figures 1 and 2, the stirring mechanism 3 has a structure in which a frame body is formed by a plurality of frame members 31, and this frame body holds a plurality of stirring blades 32. The frame members 31 and the stirring blades 32 correspond to the components that make up the stirring mechanism 3, which is the structure of this embodiment.

[0035] The frame member 31 and the stirring blade 32 are each made of, for example, a metal. The metal material making up the frame member 31 and the stirring blade 32 can be, for example, a stainless steel material or a nickel-based alloy. In the following example, a case where the stainless steel material SUS310S is used will be described. In particular, SUS310S is a metal material suitable for use under temperature conditions reaching 700 to 1300°C.

[0036] The stirring blade 32 plays a role in stirring the material PO to be treated that is supplied into the furnace body 2. From this viewpoint, the stirring blade 32 functions as a stirring member that is a placement member that is placed in the furnace body 2 to adjust the stirring state of the material PO to be treated. For example, when the stirring mechanism 3 is placed in the furnace body 2, each stirring blade 32 is configured as a rectangular plate material with long sides extending along the central axis of the cylindrical furnace body 2. The dimensions of the stirring blade 32 are set in consideration of the duration of the stirring operation of the stirring mechanism 3 for the material PO to be treated, the strength of the stirring blade 32, and the like.

[0037] As described above, in a furnace body 2 having a diameter of about 1 to 7 meters and a total length of about 4 to 120 meters, the stirring blades 32 can be configured to have a long side of about 300 to 2000 mm, a short side of about 100 to 1000 mm, and a thickness of about 2 to 25 mm at room temperature.

[0038] The frame member 31 constitutes a frame body that holds each agitating blade 32 in a position that allows the blades to agitate the object to be treated PO. Specifically, as shown in Figs. 2 and 5, the frame body holds the plurality of agitating blades 32 so that they are spaced apart from one another along the circumferential direction of the inner circumferential surface of the furnace body 2. From this perspective, the frame member 31 is the first embodiment of the present invention. 2 It has a function as a holding member.

[0039] In this case, each agitating blade 32 is disposed so that its plate surface faces a direction intersecting the radial direction of the cylindrical furnace body 2. The direction of the plate surface refers to the direction of a normal line drawn with respect to the plate surface of the agitating blade 32. In each agitating blade 32, the surface facing the downstream side in the rotation direction of the furnace body 2 serves as a first agitating blade for adjusting the agitation state of the material to be treated PO. 2 2, 4, and 5 show an example in which the radial direction of the furnace body 2 and the plate surface of the agitating blade 32 are orthogonal to each other. Note that the radial direction of the furnace body 2 and the plate surface of the agitating blade 32 are not limited to being orthogonal to each other, and the plate surface of the agitating blade 32 may be inclined relative to the radial direction and intersect with each other.

[0040] In order to hold the plurality of agitating blades 32 in the above-mentioned state, the frame member 31 in this example is configured as an arc-shaped plate extending along the circumferential direction of the inner peripheral surface of the furnace body 2. As shown in FIG. 2, FIG. 5, etc., the arc-shaped frame members 31 and the agitating blades 32 are alternately arranged along the circumferential direction of the furnace body 2 to form an annular ring structure 30 in which the agitating blades 32 are sandwiched between adjacent frame members 31. Furthermore, a frame body that holds the plurality of agitating blades 32 in a stable state is formed by forming a plurality of ring structures 30 at intervals along the length direction of the agitating blades 32 (the axial direction of the furnace body 2). In the example shown in FIG. 2, eight agitating blades 32 and frame members 31 are alternately arranged one by one to form one ring structure 30, and a total of three ring structures 30 are formed at one end, a central portion, and the other end portion of the agitating blade 32.

[0041] In forming the stirring mechanism 3 having the above-mentioned configuration, the dimensions of each frame member 31 can be determined based on the diameter of the furnace body 2, the number of frame members 31 constituting each ring structure 30, the expansion rate of the metal material under the operating temperature conditions relative to room temperature, and the like. In order to obtain a sufficient stirring effect, it is preferable to drop the object to be treated PO from as high a position as possible. From this viewpoint, it is better that the diameter of each ring structure 30 is as large as possible. On the other hand, in order to prevent damage to the ring structure 30, even after the temperature inside the furnace body 2 is raised to the temperature at which the treatment is performed and the stirring mechanism 3 expands, the diameter of each ring structure 30 needs to be within a range smaller than the inner diameter of the furnace body 2.

[0042] Considering these requirements, it is preferable to design each ring structure 30 so that its diameter is within a range of 90 to 99.5% of the inner diameter of the furnace body 2 under the operating temperature conditions of the stirring mechanism 3. The arc length of each frame member 31 is determined based on the number of frame members 31 constituting the ring structure 30 and the expansion coefficient of the metal material between use at room temperature and under temperature conditions, as described above, taking into account the diameter of the ring structure 30 during use. In addition, the width and thickness of the frame member 31 are determined in consideration of the strength, the residence time of the object to be treated PO described later, and the like, and an example can be configured so that the width is about 100 to 1000 mm and the thickness is about 2 to 25 mm at room temperature.

[0043] The plate material constituting each of the agitating blades 32 and the frame member 31 is composed of a flat plate that has not been subjected to bending processing. These frame members 31 are obtained by punching or cutting out a metal plate as a raw material. By not performing bending processing when forming the agitating blades 32 and the frame member 31, the influence of residual stress on each member 32, 31 is almost eliminated, and a decrease in strength when placed in a high-temperature atmosphere can be further suppressed.

[0044] Next, a method for forming the stirring mechanism 3 using these frame members 31 and stirring blades 32 will be described. As shown in Fig. 2 and the enlarged view in Fig. 3, both ends of each frame member 31 are provided with claw-shaped insertion ends 311 extending in the circumferential direction of the arc. Meanwhile, when each stirring blade 32 is viewed along the axial direction, two insertion openings 321 are provided adjacent to each other at each of three locations, namely, one end, the center, and the other end, which are positions where the above-mentioned ring structure 30 is formed.

[0045] 3, the insertion end 311 of the frame member 31 is fitted into the insertion opening 321 of the agitating blade 32 to form a fitting structure in which the agitating blade 32 and the frame member 31 support each other. Specifically, as shown in FIG. 1, the insertion end 311 is inserted into each insertion opening 321 so that both sides of the agitating blade 32 are sandwiched by the frame member 31.

[0046] In this way, a frame body is formed including a ring structure 30 in which the agitating blades 32 and the frame members 31 are arranged alternately. The ring structure 30 is an annular arch in which both sides of each agitating blade 32 are supported by two frame members 31, and both ends of each frame member 31 are supported by two agitating blades 32. As a result, the agitating blades 32 and the frame members 31, both of which are components, support each other without being bonded to each other, thereby forming the agitating mechanism 3.

[0047] As shown in the enlarged perspective view of FIG. 3, the insertion ends 311 provided at both ends of the frame member 31 may be configured to have an inverted trapezoid shape that gradually widens from the base end to the tip end. In this case, each insertion opening 321 may be formed to have a generally flat convex shape. Then, after the wide portion at the tip of the inverted trapezoid insertion end 311 is inserted into the wide hole of the convex shape of the insertion opening 321, the insertion end 311 is further moved. Then, when the base end of the insertion end 311 reaches a position near the plate surface of the frame member 31, the frame member 31 is moved toward the narrow hole of the convex shape of the insertion opening 321.

[0048] 3, the base end of the inverted trapezoidal insertion end 311 fits into the narrow hole of the insertion port 321. When the insertion end 311 of each frame member 31 and the mixing blade 32 is inserted into the insertion port 321 and the ring structure 30 is formed, the insertion end 311 of the frame member 31 is pushed into the insertion port 321 of the mixing blade 32 by its own weight, and a stable ring-shaped arch is formed. Furthermore, when the mixing mechanism 3 is arranged in the furnace body 2, the narrow part of the convex shape of the insertion port 321 is positioned downstream in the moving direction of the object to be treated PO. With this arrangement, the frame member 31 made of a plate material has its plate surface facing the axial direction of the cylindrical furnace body 2.

[0049] Then, when processing of the object PO is started, the frame member 31 is subjected to the force of the object PO moving from the entrance side toward the exit side, and is pressed toward the narrow portion of the hole of the insertion opening 321. As a result, movement of the frame member 31 toward the wide portion of the hole of the insertion opening 321 is suppressed, and it is possible to prevent the insertion end 311 from falling out of the insertion opening 321.

[0050] The stirring mechanism 3 having the configuration described above can be assembled, for example, inside the furnace body 2 of the RK apparatus 1 while it is stopped (a process of forming a structure inside the furnace body 2). The time required to assemble the stirring mechanism 3 is, for example, about several hours. As shown in the cross-sectional front view of FIG. 4(a), the ring structure 30 of the stirring mechanism 3 after assembly has been completed has a smaller diameter than that in the state during use.

[0051] Thereafter, when the RK device 1 is operated and the inside of the furnace body 2 is heated by the burner 14, the metals constituting the frame member 31 and the stirring blade 32 thermally expand. Meanwhile, as described above, each stirring blade 32 is supported from both sides by two frame members 31, and each frame member 31 is supported from both ends by two stirring blades 32 to form a circular arch (ring structure 30). In this way, in the circular arch, each member 31, 32 supports each other without being bonded to each other.

[0052] As described above, the ring structure 30 is designed so that the diameter of the ring structure 30 is smaller than the inner diameter of the furnace body 2 even after the RK device 1 is operated and the metals constituting the frame member 31 and the stirring blade 32 are thermally expanded. In the frame member 31 and the stirring blade 32, which support each other without being joined to each other, a gap of about several millimeters is formed between the insertion opening 321 of the stirring blade 32 and the insertion end 311 of the frame member 31 inserted into this insertion opening 321. Due to the formation of this gap, the frame member 31 and the stirring blade 32 can slip and move away from each other during thermal expansion, and stress concentration can be avoided. As a result, the force acting between these members 31 and 32 does not increase, and the thermal expansion is converted into an increase in the diameter of the annular arch (FIG. 4(b)). Therefore, even if the stirring mechanism 3 is made of a metal material whose strength decreases in a high-temperature atmosphere, it is possible to use the stirring mechanism 3 without damage.

[0053] In contrast, for example, if the frame member 31 and the stirring blade 32 are connected by welding or bolts and nuts, the members 31 and 32 are fixed to each other at the connection position. Then, due to dimensional accuracy errors during assembly of the ring structure 30, all stress is concentrated on one of the fixed parts, which may lead to damage to the ring structure 30. Even if the ring structure 30 is assembled with dimensional accuracy errors comparable to those of machining to avoid stress concentration during thermal expansion, it is difficult to avoid stress concentration in the ring structure 30 that rotates with the furnace body 2 unless the dimensional accuracy errors of the inner diameter on the furnace body 2 side are the same as those of the ring structure 30. For this reason, in reality, this is a difficult response to be realized due to cost constraints.

[0054] In the conventional RK device 1, a technique is known in which bricks are stacked in an arch shape along the inner peripheral surface of the furnace body 2 to form a wall portion, and the bricks are connected and fixed to each other and between the inner wall of the furnace body and the brick wall portion with cement such as mortar. Unlike such a technique, in the stirring mechanism 3 of this example, the frame member 31 and the stirring blades 32 are not connected with cement.

[0055] On the other hand, for example, when assembling the stirring mechanism 3, these components 31, 32 may be temporarily secured together by welding or cement, and during use, these temporary fastenings may be broken due to thermal expansion, resulting in a state in which the frame component 31 and the stirring blades 32 are not connected to each other.

[0056] Returning to the explanation of the operation of the stirring mechanism 3, the furnace body 2 is rotated, and the supply of the material to be treated PO from the supply part 11 is started, and the material to be treated PO is treated (FIG. 1, step of supplying the material to be treated PO). In this process, as shown in FIG. 5, the agitation mechanism 3 in the furnace body 2 rolls with the rotation of the furnace body 2 while being pressed against the bottom surface of the furnace body 2 by the weight of the objects to be treated PO as well as the weight of the members 31 and 32 themselves. 2A part of the object PO to be treated is lifted up by the protruding surface of the agitating blade 32. Next, when the agitating blade 32 that has scooped up the object PO is tilted downward, the object PO to be treated falls from the agitating blade 32 as shown by the dashed arrow in Fig. 5. In this way, the lifting and falling are repeated, and the agitation of the object PO to be treated progresses (a process of agitating the object PO to be treated).

[0057] In addition, when each frame member 31 is made of a plate material, when the frame body of the agitation mechanism 3 is arranged in the state shown in FIG. 2, the plate surface faces the axial direction of the cylindrical furnace body 2. When viewed from the front, as shown in FIG. 5, the frame member 31 is arranged with its plate surface facing the axial direction of the furnace body 2. This frame member 31 plays the role of a weir, and holds back a part of the object to be treated PO moving along the axial direction from the inlet side to the outlet side, and can adjust the state of movement. This action makes it possible to adjust the residence time of the object to be treated PO in the area where the agitation mechanism 3 is arranged (step of adjusting the movement of the object to be treated PO). The residence time can also be adjusted by the width dimension of the frame member 31, that is, the height of the weir. Note that the plate surface of the frame member 31 being arranged in the axial direction is not limited to the case where the normal line drawn to the plate surface of the frame member 31 is formed to be parallel to the axial direction of the furnace body 2. Even if the plate surface of the frame member 31 is inclined with respect to the axial direction, as long as it has a component along the axial direction, it can still hold back part of the object to be treated PO and adjust the state of movement.

[0058] From the above viewpoint, the frame member 31 has a function as a weir member, which is a member arranged in the furnace body 2 to adjust the state of movement of the object to be treated PO. The plate surface of the frame member 31, which is located on the upstream side of the flow direction of the object to be treated PO and arranged in a direction intersecting the axial direction of the furnace body 2, is the first embodiment of the present invention. 1 The agitating blades 32 correspond to the protruding surfaces. When viewed from each frame member 31, the agitating blades 32 hold the frame members 31 at intervals along the axial direction of the furnace body 2. From this point of view, the agitating blades 32 are the first blades that hold the frame members 31. 1 It can be said that it also functions as a holding member.

[0059] The stirring mechanism 3 according to the present embodiment has the following effects. A plurality of components (stirring blades 32 and frame member 31) are arranged in the cylindrical furnace body 2 of the RK device 1 and serve as arrangement members for adjusting the state (stirring state and movement state) of the material to be treated PO supplied into the furnace body 2, and are supported by each other in a state of being unconnected to each other, so that these arrangement members are arranged along the inner circumferential surface of the furnace body 2. With this configuration, welding or bolt-nut fastening of the members 31 and 32 is not used, so that residual stress and tissue degeneration during processing of each member are small, and the material to be treated PO can be stably stirred even in a high-temperature atmosphere in the furnace body 2 of the direct heating type RK device 1.

[0060] Here, the specific configuration of the stirring mechanism 3 is not limited to the examples shown in Figs. 2, 5, etc. For example, as shown in the second embodiment in Fig. 6, the shape of the stirring mechanism 3a (ring structure 30) when viewed from the front may be configured to be polygonal. In this case, the frame member 31a is configured of a long and straight plate material. In each embodiment described below with reference to Figs. 6 to 12, the components common to the first embodiment described with reference to Figs. 1 to 5 are denoted by the same reference numerals as those in these figures.

[0061] Moreover, it is not essential that only one of the insertion end 311 and the insertion port 321 is provided on the frame member 31 and the agitating blade 32. For example, the frame member 31 and the agitating blade 32 may each be provided with the insertion end 311 and the insertion port 321.

[0062] The stirring mechanism 3b according to the third embodiment shown in Figures 7 to 9 includes, as arrangement members, the stirring blade 32 and frame member 31 already described, as well as a metallic protective wall member 33 arranged to cover the inner surface of the furnace body 2 in the circumferential direction.

[0063] The protective wall member 33 is configured by curving a rectangular metal plate along the outer peripheral shape of the frame member 31. As with the stirring blade 32 and the frame member 31, the protective wall member 33 may be made of SUS310S. A plurality of protruding insertion ends 331 are formed at intervals on both side surfaces of each protective wall member 33. Meanwhile, the frame member 31 is formed with a plurality of insertion openings 313 for inserting the respective insertion ends 331 when the protective wall member 33 is disposed along the outer peripheral edge of the frame member 31.

[0064] Each protective wall member 33 is disposed in an area surrounded by the agitating blades 32 disposed adjacent to each other along the circumferential direction of the ring structure 30 and the frame member 31 that holds these agitating blades 32. Then, by inserting the insertion end 331 on the protective wall member 33 side into the insertion opening 313 on the frame member 31 side, an agitating mechanism 3b in which multiple protective wall members 33 are disposed along the inner circumferential surface of the furnace body 2 is formed. Here, as described above, the agitating blades 32 and the frame member 31 support each other without being joined to each other to form the agitating mechanism 3 (ring structure 30).

[0065] When the stirring mechanism 3b having the above-mentioned configuration is installed in the furnace body 2 and the RK device 1 is operated to treat the material PO to be treated, the material PO to be treated is stirred by the stirring blades 32 as described above, and the movement of the material PO to be treated is adjusted by the frame member 31 that plays the role of a weir member. Furthermore, as shown in FIG. 7, the stirring mechanism 3b is provided with a protective wall member 33 so as to cover the inner circumferential surface of the furnace body 2 along the circumferential direction. The arrangement of the protective wall member 33 prevents the material PO to be treated from directly contacting the fireproof wall formed on the inner wall surface of the furnace body 2, and can protect the material PO from damage due to contact with the material PO to be treated (a process of treating the material PO to be treated with the inner circumferential surface of the furnace body 2 covered by the protective wall member 33).

[0066] The ring structure 30 including the protective wall member 33 may also be configured so that the shape of the stirring mechanism 3c (ring structure 30) when viewed from the front is polygonal. Figures 10 and 11 are a front view and a perspective view of the stirring mechanism 3c according to the fourth embodiment configured in a polygonal shape. The stirring mechanism 3c of this example is configured by combining multiple divided bodies 35 (six in the case of a hexagon) in a ring shape.

[0067] As shown in the perspective view of FIG. 12, each of the divided bodies 35 is configured as a single member including the stirring blade 32, the frame member 31, and the protective wall member 33. The divided body 35 is configured by punching or cutting a metal plate such as SUS310S, and bending the area that constitutes the frame member 31 and the stirring blade 32. In FIG. 12, the member with the reference numeral 351 indicates a locking member that locks both sides of the stirring blade 32 when multiple divided bodies 35 are combined in a ring shape to prevent lateral displacement. In addition, in the two divided bodies 35a and 35b, the formation of the locking member 351 at the position surrounded by the dashed line in FIG. 11 is omitted so that the stirring mechanism 3c can be assembled inside the furnace body 2. With the above-described configuration, it is possible to configure the stirring mechanism 3c consisting of the ring structure 30 in which the multiple divided bodies 35, 35a, 35b support each other without being bonded to each other.

[0068] 1 to 12, an example of application of the stirring mechanisms 3, 3a to 3c according to the respective embodiments to the direct heating type RK apparatus 1 in which the inside of the furnace body 2 is directly heated using the burner 14 has been described. On the other hand, the RK apparatus 1 in which the stirring mechanisms 3, 3a to 3c are used to stir the object to be treated PO, adjust the movement, and protect the inner wall surface of the furnace body 2 is not limited to the direct heating type. For example, the stirring mechanisms 3, 3a to 3c may be provided in the RK apparatus 1 of an indirect heating type in which a heating coil or a jacket through which a heating fluid flows is provided to cover the outer wall surface of the furnace body 2, and the object to be treated PO is heated from the outside of the furnace body 2.

[0069] The stirring mechanism may include, as a placement member arranged along the inner circumferential surface of the furnace body 2, a member having at least one function among the stirring member (stirring mechanism 3, stirring blade 32 in the examples of 3a to 3c), the dam member (frame member 31), and the protective wall member 33. For example, in the structure shown in FIG. 2, when it is desired to utilize only the function of the dam member (frame member 31), the width dimension of member 32 (protruding height from the outer periphery of ring structure 30) can be set to be equal to or smaller than that of frame member 31.

[0070] It is not essential that the components of the stirring mechanisms 3, 3a to 3c (stirring blades 32, frame member 31, protective wall member 33) are made of metal. For example, these components may be made of materials other than metal as long as they have heat resistance in the temperature environment inside the furnace body 2 and are unlikely to crack or break in terms of the processing amount and bulk density of the material PO to be treated, the rotation speed of the furnace body 2, and the like. Examples of materials other than metal include ceramic materials, carbon fiber molding materials, and polyimide materials. Some polyimide materials have heat resistance of about 500°C, for example. Furthermore, the frame members 31, 31a are not limited to being made of plate material, but may be made of bar material such as a round bar or a square bar. [Explanation of symbols]

[0071] PO Processing target 1 Rotary Kiln (RK) Equipment 14 Burner 2 Furnace body 3, 3a~3c Mixing Mechanism 31 Frame members 311 Insertion end 313 Insertion port 32 Mixing blade 321 Insertion port 33 Protective wall components

Claims

1. A structure to be placed in a cylindrical furnace body of a rotary kiln apparatus, A plurality of components, including a placement member arranged for the purpose of adjusting the state of the material to be treated supplied into the furnace body, are supported by each other in a state where they are not joined together, so that the placement member is arranged along the inner circumferential surface of the furnace body; the arrangement member has a first protruding surface arranged toward the axial direction of the cylindrical furnace body, and is a dam member for adjusting a state of the movement by holding back a part of the object to be treated moving along the axial direction with the first protruding surface, A structure characterized in that the constituent members include a plurality of the dam members and a plurality of first holding members for holding the plurality of dam members at intervals from each other along the axial direction of the furnace body.

2. the first holding member has a second protruding surface arranged in a direction intersecting the radial direction of the cylindrical furnace body, moves along the circumferential direction of the furnace body as the furnace body rotates, and is configured as the arrangement member for adjusting the state of agitation of the object to be treated by lifting up a part of the object to be treated with the second protruding surface and then dropping it; The structure described in claim 1, characterized in that the dam member is a plurality of the stirring members and a plurality of second holding members for holding the plurality of stirring members at intervals from each other along the circumferential direction of the inner surface of the furnace body.

3. A structure to be placed in a cylindrical furnace body of a rotary kiln apparatus, A plurality of components, including a placement member arranged for the purpose of protecting the inner circumferential surface of the furnace body, are supported by each other in a state where they are not joined together, so that the placement member is arranged along the inner circumferential surface of the furnace body; The arrangement member is a metal protective wall member arranged to cover the inner circumferential surface of the furnace body along the circumferential direction, A structure, wherein the constituent member is composed of a plurality of the protective wall members.

4. 4. The structure according to claim 1, wherein the structure is disposed in a region in the furnace body where the temperature is in the range of 400 to 1300° C.

5. 4. The structure according to claim 1, wherein the component members are made of metal.

6. A method of using a rotary kiln apparatus, comprising: A step of operating the rotary kiln apparatus with the structure according to claim 1 disposed in a furnace body and supplying a material to be treated to the furnace body; and a step of adjusting the movement of the object to be treated by using the dam member to hold back the movement of a portion of the object to be treated.

7. A method of using a rotary kiln apparatus, comprising: A step of operating the rotary kiln apparatus with the structure according to claim 2 disposed in the furnace body and supplying a material to be treated to the furnace body; A method for using a rotary kiln apparatus, comprising: a step of rotating the structure in association with the rotation of the furnace body, and stirring the object to be treated with the stirring member.

8. A method of using a rotary kiln apparatus, comprising:

4. A method for using a rotary kiln apparatus, comprising the steps of: operating the rotary kiln apparatus with the structure according to claim 3 disposed within the furnace body; supplying an object to be treated into the furnace body with the inner peripheral surface of the furnace body covered by the protective wall member; and treating the object to be treated.

9. A method for manufacturing a structure to be placed in a cylindrical furnace body of a rotary kiln apparatus, A step of forming the structure such that a plurality of components, including a placement member arranged for the purpose of adjusting the state of the treatment object supplied into the furnace body, are supported by each other in a state of not being joined to each other, and the placement member is arranged along the inner circumferential surface of the furnace body; The arrangement member is configured as a weir member having a first protruding surface that adjusts a state of the movement by holding back a part of the object to be processed moving along the axial direction, A method for manufacturing a structure, characterized in that in the process of forming the structure, a plurality of the dam members are held at intervals along the axial direction of the furnace body by a plurality of first retaining members, which are the constituent members, and the first protruding surface of each of the dam members is arranged facing the axial direction of the cylindrical furnace body.

10. the first holding member is a stirring member configured as the arrangement member having a second protruding surface for moving along the circumferential direction of the furnace body with the rotation of the furnace body, lifting up a part of the object to be treated and then dropping it to adjust the state of stirring of the object to be treated; The method for manufacturing a structure as described in claim 9, characterized in that in the process of forming the structure, the multiple stirring members are held at intervals from each other along the circumferential direction of the inner surface of the furnace body by the multiple second holding members which are the dam members, and the second protruding surfaces of each of the stirring members are arranged so as to face in a direction intersecting the radial direction of the cylindrical furnace body.

11. A method for manufacturing a structure to be placed in a cylindrical furnace body of a rotary kiln apparatus, comprising: A step of forming the structure such that a plurality of components, including a placement member arranged for the purpose of protecting the inner circumferential surface of the furnace body, are supported by each other in a state of not being joined to each other, and the placement member is arranged along the inner circumferential surface of the furnace body; The placement member is configured as a protective wall member made of metal, A method for manufacturing a structure, characterized in that in the step of forming the structure, a plurality of the protective wall members are arranged so as to cover the inner surface of the furnace body along a circumferential direction.

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