Structure and rotary kiln apparatus use method

Abstract

To provide a technique according to a structure for being arranged at a cylindrical furnace body of a rotary kiln apparatus and adjusting the state of a treatment object.SOLUTION: In a structure 3 arranged at a furnace body 2 of a rotary kiln apparatus 1, a protruding member 31 is arranged so as to protrude from an inner wall face in the furnace body 2 and adjusts the state of a processing object PO, a support member 32 is inserted in a state where a gap is formed with the inner circumferential face of a through hole 201 passing through the furnace body 2 and supports the protruding member 31 at the side of the inner wall face of the furnace body 1, and a locking member 33 is provided at the side of an outer end part of the support member 32, is brought into contact with the outer wall face of the furnace body 2 and is locked to prevent the falling of the protruding member 31 into the furnace body. The locking member 33 is formed with a taper face 331 or a protrusion for avoiding the fact that it is locked in a surface contact with the outer wall face.SELECTED DRAWING: Figure 5A

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. [Background technology]

[0002] For example, rotary kiln (RK) equipment heats the inside of the furnace to process materials in a high-temperature atmosphere, such as for incinerating waste, burning inorganic materials such as ceramics, or burning contaminated soil. Some RK equipment is equipped with stirring blades to stir the materials being processed.

[0003] For example, in the furnace body of an RK apparatus, there are regions where the temperature reaches as high as 400 to 1300° C., so the inner circumferential surface of the furnace body is usually covered with monolithic refractory. In this case, 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 monolithic refractory is molded around the reinforcing anchor to form a lifter that protrudes into the furnace and is used as a stirring blade (for example, Patent Documents 1 and 2).

[0004] However, in an RK device where the furnace interior reaches high temperatures, the difference in thermal expansion coefficient between the reinforcing anchors, which are made of metal, and the monolithic refractory increases. This causes a problem in that the thermal expansion of the reinforcing anchors embedded inside the furnace increases the likelihood of cracks in the surrounding monolithic refractory progressing. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 4-292785 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-24137 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made under such a background, and provides a technique relating to a structure that is arranged in a cylindrical furnace body of a rotary kiln apparatus to adjust the state of an object to be treated. [Means for solving the problem]

[0007] This structure is a structure to be placed in a cylindrical furnace body of a rotary kiln apparatus, a protruding member disposed to protrude from an inner wall surface of the furnace body in order to adjust the state of the material to be treated supplied into the furnace body; a support member configured to be inserted into the through-hole penetrating the furnace body with a gap formed between it and the inner peripheral surface of the through-hole, the support member supporting the protruding member at its inner end on the inner wall surface side of the furnace body, and the outer end on the outer wall surface side of the furnace body being arranged to protrude from the opening of the through-hole on the outer wall surface side; A locking member is provided at the outer end of the support member and is engaged with an outer wall surface of the furnace body to prevent the protruding member from falling into the furnace body, The locking member is characterized by having a tapered surface or a protrusion formed thereon to prevent the locking member from being locked to the outer wall surface through surface contact.

[0008] The structure may have the following features: (a) The protruding member has a protruding surface arranged in a direction intersecting the radial direction of the cylindrical furnace body, moves with the rotation of the furnace body, and is an agitation member for adjusting the agitation state of the object to be treated by lifting a portion of the object to be treated with the protruding surface and then dropping it. (b) The protruding member has a protruding surface arranged toward the axial direction of the cylindrical furnace body, and is a weir member for adjusting the state of movement by holding back a portion of the object to be treated moving along the axial direction with the protruding surface. (c) The protruding member is made of a plate material, and a reinforcing rib is provided on the plate surface of the plate material so as to protrude in a direction intersecting the plate surface and be in contact with the inner wall of the furnace body to support the protruding member. In this case, the base end of the reinforcing rib on the inner wall side of the furnace body is located inside steps formed on the inner wall at intervals along the rotation direction or axial direction of the furnace body, and the reinforcing rib is configured to have a dimension such that a gap is formed between the base end and the side wall surfaces of the front and rear steps under temperature conditions inside the furnace body while the rotary kiln apparatus is in operation, allowing the reinforcing rib to move inside the front and rear steps. (d) The protruding members are formed by molding a castable refractory material into a block shape around anchors provided at the inner ends of the support members, and the base ends of the protruding members on the inner wall side are arranged inside stepped portions formed on the inner wall at intervals along the rotational direction or axial direction of the furnace body, and the protruding members are configured to have dimensions such that gaps are formed between the base ends and the side wall surfaces of the front and rear stepped portions under temperature conditions inside the furnace body while the rotary kiln apparatus is in operation, allowing them to move within the front and rear stepped portions.

[0009] How to use this rotary kiln equipment: A step of operating the rotary kiln apparatus with the structure described in (a) placed in the furnace body and supplying a material to be treated to the furnace body; and a step of stirring the object to be treated by the stirring member that moves in accordance with the rotation of the furnace body. Alternatively, another method for using a rotary kiln apparatus includes the steps of: operating the rotary kiln apparatus with the structure described in (b) arranged in the 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 weir member to stop the movement of a part of the object to be treated. [Effects of the Invention]

[0010] This structure is arranged in the furnace body of a rotary kiln apparatus. The support member, which supports the protruding member for adjusting the condition of the material to be treated, is configured to be inserted into the through-hole that penetrates the furnace body with a gap formed between it and the inner circumferential surface, allowing the support member to move within the through-hole as the furnace body rotates. Furthermore, the outer end of the support member is provided with a locking member that contacts and locks with the outer wall surface of the furnace body outside the opening of the through-hole, preventing the protruding member from falling into the furnace body. This locking member has a tapered surface or protrusion in the area that contacts the outer wall surface of the furnace body. This configuration prevents the locking member from being locked by surface contact with the outer wall surface of the furnace body when the support member moves within the through-hole, thereby reducing stress on the structure. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating the configuration of a rotary kiln (RK) device. [Figure 2] FIG. 2 is a longitudinal sectional side view of the furnace body of the RK device. [Figure 3A] FIG. 2 is a longitudinal cross-sectional view of the furnace body at the center position. [Figure 3B] FIG. 2 is a rear view of the furnace body as seen from the outlet side. [Figure 4] 10A and 10B are three-view diagrams of an adjustment mechanism provided in the furnace body. [Figure 5A] FIG. 10 is a first operational view of the adjustment mechanism. [Figure 5B] FIG. 10 is a second operational view of the adjustment mechanism. [Figure 5C] FIG. 10 is a third operational view of the adjustment mechanism. [Figure 5D] FIG. 10 is a fourth operational view of the adjustment mechanism. [Figure 6] 10A and 10B are diagrams illustrating the operation of an adjustment mechanism according to a comparative example. [Figure 7] 10A and 10B are diagrams illustrating another example of a locking member having a tapered surface. [Figure 8A] FIG. 10 is a side view showing a modified example of the tapered surface. [Figure 8B] FIG. 10 is a side view showing another modified example of the tapered surface. [Figure 9] 10A and 10B are three-view diagrams of an adjustment mechanism according to a second embodiment. [Figure 10] 10A and 10B are diagrams illustrating the operation of the adjustment mechanism according to the second embodiment. [Figure 11] FIG. 1 is a diagram illustrating the configuration of a conventional lifter. [Figure 12] 10A and 10B are three-view diagrams of an adjustment mechanism according to a third embodiment. [Figure 13] 10A and 10B are diagrams illustrating the operation of the adjustment mechanism according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, the adjusting mechanism 3, which is a structure of this embodiment and has a function of adjusting the state of stirring and movement of the object to be processed, will be described with reference to the drawings. 1 shows an example of the configuration of a rotary kiln (RK) apparatus 1 provided with the adjustment mechanism 3 of this embodiment and in which the material to be treated is agitated. 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 material to be treated in this embodiment.

[0013] 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 unit 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 and drives the furnace body 2.

[0014] For example, the furnace body 2 is configured such that the inner circumferential surface of a cylindrical steel material is covered with a fireproof wall. There are no particular limitations on the dimensions of the furnace body 2, but when incinerating waste or burning inorganic materials or contaminated soil, a configuration of approximately 1 to 7 meters in diameter and approximately 4 to 120 meters in total length can be exemplified.

[0015] The furnace body 2 can be exemplified by a configuration in which a heat insulating castable and a refractory castable are sequentially layered on the inner peripheral surface of a steel outer shell 20a to form a lining 20b. Furthermore, an annular restricting portion 21 and a weir member 30b protruding toward the inside of the furnace body 2 are provided on the inner peripheral surfaces of the inlet and outlet portions of the furnace body 2 to restrict the flow of the material to be treated PO. The restricting portion 21 at the inlet portion is formed, for example, by molding refractory castable. Furthermore, the weir member 30b at the outlet portion is formed by an adjustment mechanism 3. A specific configuration example of the adjustment mechanism 3 will be described later.

[0016] A supply unit 11 is provided on the inlet side of the furnace body 2, which supplies 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. The 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 introduced. Meanwhile, the 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 introduced into the inlet 111 is transported by the screw feeder 112 and supplied 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.

[0017] The opening on the inlet side of the furnace body 2 is covered by a supply-side hood 12. The screw feeder 112 described above is disposed so as to pass through this supply-side hood 12. Furthermore, an exhaust pipe 121 is provided on the top surface of the furnace body 2, and exhaust gas generated inside the furnace body 2 is discharged to the outside through this exhaust pipe 121.

[0018] 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 weir portion 22 is discharged to the outside through this discharge port 131.

[0019] Furthermore, a burner 14 is inserted into the discharge-side hood 13 from its side. In the example shown in FIG. 1, the tip of the burner 14 is located inside the opening on the outlet side of the furnace body 2. Note that the configuration in which the burner 14 is inserted into the furnace body 2 via the discharge-side hood 13 as described above is not an essential requirement. For example, a configuration in which the burner 14 is inserted into the furnace body 2 from the supply-side hood 12 side may also be adopted. The burner 14 may be configured to burn a liquid fuel or a gaseous fuel. By burning the fuel in the burner 14, the material to be treated PO in the furnace body 2 is heated. At this time, a region in the furnace body 2 where the temperature reaches 400 to 1300°C is formed.

[0020] A pinion 153 is disposed below the furnace body 2. The pinion 153 is in mesh 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 drive 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, drive unit 152, and girth gear 24 constitute a drive mechanism for the furnace body 2.

[0021] In addition to the girth gear 24 already described, 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 are arranged below the furnace body 2, supporting the furnace body 2 via these tire rollers 23. 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 their positions decrease from the entrance side to the exit side.

[0022] As described above, the furnace body 2 of the RK apparatus 1 is disposed at an angle, and therefore, in figures such as Figures 1 and 2 that include the configuration of the furnace body 2, XYZ coordinate axes are depicted, in which the Y axis is set in a direction along the central axis of the furnace body 2, the X axis is set in a direction perpendicular to the Y axis in a transverse plane of the furnace body 2 that includes the Y axis, and the Z axis is set in a direction perpendicular to the transverse plane. Also, Figure 1 depicts X-Y0-Z0 coordinate axes, in which the Y0 axis is set perpendicular to the X axis in a plane that includes the X axis and is aligned with the installation surface of the RK apparatus 1, and the Z0 axis is set in the direction of gravity.

[0023] In the supply unit 11 having the above-described configuration, the furnace body 2 is rotated by the drive mechanism, the interior 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 by the burner 14 during this period. Then, after treatment, the material to be treated PO passes over the weir unit 30b provided on the outlet side of the furnace body 2 and is discharged from the discharge port 131 via the discharge-side hood 13.

[0024] If the rotation of the furnace body 2 does not sufficiently agitate the material PO to be treated, oxygen may not be supplied evenly to the entire material PO in the case of incineration, or the material PO may not be heated to the target temperature at the designed position and then sufficient calcination time may not be ensured, which may make it difficult to uniformly carry out the desired treatment. Therefore, as explained in the Background Art section, the conventional RK device 1 has agitator blades that protrude into the furnace by molding monolithic refractory. As the furnace body 2 rotates, the material PO to be treated is lifted to a higher position by the agitator blades and then falls from the agitator blades, allowing the material PO to be agitated and treated uniformly.

[0025] For example, Fig. 11 shows an example of a conventional method for attaching agitator blades 3B to a furnace body 2. As shown in Figs. 1, 3A, and 3B, the furnace body 2 of this example is formed in a cylindrical shape, but in the enlarged views of Figs. 5A to 5D, 6, 10, and 11, the curvature of the wall surface of the furnace body 2 is omitted. 11, a support member 32 having a thread formed at its outer end 321 is passed through the outer shell 20a and the lining 20b that constitute the furnace body 2 and fixed with a nut 38. An anchor 322 for stably holding a refractory block 36 is formed at the inner end of the support member 32 that protrudes into the furnace body 2. Then, a monolithic refractory material is molded around the anchor 322 to form a long, slender block-shaped refractory block 36.

[0026] The agitator blade 3B attached by the above method has the refractory block 36 fixed to the inner wall of the rotating furnace body 2. Therefore, the load of the refractory block 36 is applied to the support member 32. In particular, as shown in FIG. 11 , when the attachment position of the refractory block 36 reaches the height of the central axis of the furnace body 2 and the support member 32 faces in the direction along the cross section of the furnace body 2 (the X-axis direction in FIG. 11 ), the maximum bending stress is applied to the support member 32 in the area indicated as the stress generation portion SP in FIG. 11 . If the lifted material PO remains on the refractory block 36, the load applied from the refractory block 36 (the bending stress applied to the support member 32) becomes even greater. Furthermore, as mentioned above, repeated application of large stresses in a high-temperature atmosphere, including high-temperature regions of approximately 400 to 1300°C, may significantly shorten the life of the material of the support member 32.

[0027] In the RK device 1 of this embodiment, the adjustment mechanism 3, which is the structure of this embodiment, is attached to the furnace body 2 and used as the stirring member 30a and the weir member 30b. When attaching the adjustment mechanism 3 to the furnace body 2, a configuration is adopted that can suppress the influence of stress applied to the adjustment mechanism 3. Below, specific configuration examples of the adjustment mechanism 3 and a method of attaching it to the furnace body 2 will be described with reference to the drawings.

[0028] 1, 2, and 3A, the furnace body 2 of the RK apparatus 1 of this example is provided with stirring members 30a that protrude from the inner wall surface and adjust the stirring state of the material to be treated PO. Each stirring member 30a is configured with an adjustment mechanism 3 shown in FIG. 4, for example, and a plurality of adjustment mechanisms 3 (four in the example shown in the figure) are provided lined up in a row along the axial direction (Y-axis direction) of the furnace body 2. Here, each adjustment mechanism 3 is arranged so that a protruding surface 310 of a protruding member 31, which will be described later, faces in a direction intersecting the radial direction of the furnace body 2.

[0029] 3A, these adjustment mechanisms 3 are provided in multiple rows (four rows in the illustrated example) at intervals along the circumferential direction of the furnace body 2. Furthermore, as shown in FIGS. 1 and 2, the furnace body 2 is provided with multiple sets (two sets in the illustrated example) of these multiple rows of adjustment mechanisms 3 along the axial direction of the furnace body 2.

[0030] The arrangement of the adjustment mechanisms 3 used as the agitation members 30a is not limited to the above example. As long as the objects to be treated PO can be agitated by lifting up a part of the objects to be treated PO using the protruding members 31 provided on the adjustment mechanisms 3 (described later) and then dropping them, the number and arrangement shape of the adjustment mechanisms 3 (such as an arrangement of the adjustment mechanisms 3 in a row or an arrangement of the adjustment mechanisms 3 spaced apart in the circumferential direction of the furnace body 2) may be changed as appropriate.

[0031] 1, 2, and 3B, the furnace body 2 is provided with weir members 30b that protrude from the inner wall surface and adjust the state of movement of the material to be treated PO. Each weir member 30b is also configured with an adjustment mechanism 3, for example, as shown in FIG. 4. In this example, a plurality of adjustment mechanisms 3 are provided adjacent to each other along the circumferential direction of the furnace body 2. Each of these adjustment mechanisms 3 is arranged such that a protruding surface 310 of a protruding member 31, which will be described later, faces the axial direction of the furnace body 2.

[0032] As shown in the enlarged view in FIG. 3B , a gap d is formed between adjacent weir members 30b to prevent them from coming into contact with each other during thermal expansion. The dimension of the gap d is set to a value ranging from several millimeters to several centimeters, for example. The specific value of the dimension of the gap d varies depending on the temperature inside the furnace body 2 in the region where the weir members 30b are arranged and the material of which the weir members 30b are made. For example, if 72 weir members 30b made of SUS310S are arranged at a position where the temperature inside the furnace body 2 has an inner diameter of 3 meters and is at 1000°C, the gap d will be approximately 2 to 3 millimeters. On the other hand, even if a gap d of several centimeters is provided, the function of the weir members 30b to adjust the movement state of the material to be treated PO does not change significantly.

[0033] Here, the arrangement of the adjustment mechanisms 3 used as the weir members 30b is not limited to the above example. As long as the protruding members 31 provided on the adjustment mechanisms 3 can be used to hold back part of the object to be processed PO moving in the axial direction, the number and shape of the adjustment mechanisms 3 (such as the annular arrangement of the adjustment mechanisms 3 and the number of rings of the adjustment mechanisms 3) may be changed as appropriate.

[0034] Next, a configuration example of the adjustment mechanism 3 will be described with reference to Fig. 4. The adjustment mechanism 3 shown in Fig. 4 is made of a heat-resistant metal plate. When the adjustment mechanism 3 is made of a metal material, examples of the metal material that can be used include stainless steel and nickel-based alloys.

[0035] An example of a case in which the adjustment mechanism 3 is made of a metal plate is a flat plate that has not been bent. In this case, the material for the adjustment mechanism 3 is obtained by punching or cutting a raw metal plate. By not bending the metal material when forming the components that make up the adjustment mechanism 3, there is almost no effect of residual stress, and a decrease in strength when placed in a high-temperature atmosphere can be suppressed.

[0036] As shown in Figures 4(a) to 4(c), the adjustment mechanism 3 of this example includes a protruding member 31, a support member 32 that supports the protruding member 31, a locking member 33 that prevents the protruding member 31 from falling off into the furnace body 2, and a reinforcing rib 35. In order to clarify the positioning of the adjustment mechanism 3, whose orientation changes in response to the rotation of the furnace body 2, in the operation diagrams described below, Figures 4 to 10, 12, and 13 also show coordinate axes (X'-Y'-Z' coordinate axes) that are set independently for the adjustment mechanisms 3, 3a, and 3b, in addition to the coordinate axes (XYZ coordinate axes) set for the furnace body 2 described using Figures 2 to 3B.

[0037] As shown in FIG. 4(b), the protruding member 31 and the support member 32 in this example are formed by processing a common metal plate into a U-shape, with the long side of the U-shape being the protruding member 31 and the two short sides extending from both ends of the protruding member 31 being the support members 32. Locking members 33 made of elongated plates are provided at the ends of the two support members 32 to connect these ends. The support member 32 and the locking member 33 are fastened to each other with bolts 34 and nuts 341. Furthermore, as shown in FIGS. 4(b) and 4(c), a tapered surface 331 is formed on the long side of the locking member 33 facing the protruding member 31 across the support member 32, with the thickness of the plate material gradually decreasing from the end of the support member 32 toward the direction in which the protruding member 31 is disposed.

[0038] Further, reinforcing ribs 35 are provided in the regions near both ends of the plate surface of the protruding member 31 when viewed along the long side direction, so as to protrude in a direction intersecting with the plate surface of the protruding member 31. In the adjustment mechanism 3 of this example, each reinforcing rib 35 is configured by processing a plate member into an arrowhead shape. For example, the protruding member 31 and the reinforcing rib 35 have a notch at their joint, and the two members 31, 35 are connected by a notched joint.

[0039] More specifically, although not shown in the figures, the protruding member 31 has a slit formed along the dashed line in Figure 4(b), for example, for inserting the reinforcing rib 35. Furthermore, a notch extending in the Z' direction in the figure is formed at the tip of this slit. The notch on the protruding member 31 is fitted into the notch on the reinforcing rib 35, thereby forming a half-joint connection between these members 31 and 35. When the adjustment mechanism 3 is placed in the furnace body 2, the reinforcing rib 35 is sandwiched between the protruding member 31 and the inner wall surface of the furnace body 2 (lining 20b), preventing the reinforcing rib 35 from falling off (see Figure 5A, etc.).

[0040] The adjustment mechanism 3 having the configuration described above is disposed so that the protruding member 31 is located inside the furnace body 2. Here, Figures 5A to 5D show the states of the adjustment mechanism 3 (agitating member 30a) when the furnace body 2 rotates clockwise as viewed from the outlet side, for example, and reaches positions A to D enclosed by chain lines in Figure 3A.

[0041] For example, as shown in Fig. 5A, the furnace body 2 has a plurality of through holes 201 formed radially through the outer shell 20a and the lining 20b, corresponding to the positions where the stirring members 30a and the weir members 30b described with reference to Figs. 2 to 3B will be disposed. By inserting the two support members 32 of each adjustment mechanism 3 into these through holes 201, the protruding members 31 supported on the ends of the support members 32 are positioned to protrude from the inner wall surface of the furnace body 2. Hereinafter, the ends of the support members 32 facing the inner wall surface of the furnace body 2 will also be referred to as the "inner end."

[0042] Here, the inner dimensions of through hole 201 are formed larger than the outer dimensions of support member 32, and when support member 32 is inserted, a gap is formed between support member 32 and the inner circumferential surface of through hole 201. With this configuration, support member 32 can move within through hole 201.

[0043] Furthermore, the end of the support member 32 inserted into the through-hole 201 protrudes to the outside through the opening of the through-hole 201 on the outer wall surface side of the furnace body 2. Hereinafter, the end of the support member 32 on the outer wall surface side of the furnace body 2 will also be referred to as the "outer end". Then, by providing a locking member 33 to connect the outer ends of the two support members 32 protruding from the opening of the through-hole 201, a square-shaped frame is formed as shown in Figure 4(b). This locking member 33 comes into contact with and locks onto the outer wall surface of the furnace body 2, preventing the protruding member 31 from falling off into the furnace body 2. Note that, if it is desired to prevent gas from leaking from the furnace body 2 to the outside due to the provision of the through-hole 201 in the furnace body 2, a cover may be provided to cover the area where the adjustment mechanism 3 is provided from the outer wall surface side of the furnace body 2.

[0044] Furthermore, a recess 202 is formed on the inner wall surface of the furnace body 2. The base end of the arrowhead-shaped reinforcing rib 35 is housed in this recess 202. The recess 202 constitutes the step portion of this embodiment. In particular, when the adjustment mechanism 3 is used as the stirring member 30a, the recess 202 including the side walls spaced apart along the rotation direction of the furnace body 2 corresponds to the step portion. On the other hand, when the adjustment mechanism 3 is used as the weir member 30b, the recess 202 including the side walls spaced apart along the axial direction of the furnace body 2 corresponds to the step portion.

[0045] As will be explained later in the description of operation, the depth of the recess 202 is not particularly limited as long as the reinforcing rib 35 can contact the side wall surface of the recess 202, which is part of the inner wall of the furnace body 2, and support the protruding member 31. For example, the depth can be set to a range of several millimeters to several centimeters. More specifically, the depth range of the recess 202 also varies depending on the configuration of the furnace body 2. For example, if the inner wall of the furnace body 2 is made of steel and is exposed without a lining such as heat-resistant castable, the recess 202 may be shallow, approximately 3 millimeters, because there is little risk of shape deformation due to wear and tear of the constituent material. On the other hand, in a furnace body 2 provided with a lining 20b that is easily worn, such as refractory castable, the depth of the recess 202 is determined depending on the material of the lining 20b and taking into account shape deformation due to wear and tear. However, if the lining 20b is provided, the depth of the recess 202 must be less than the thickness of the lining 20b. The two dashed lines shown in Figures 4(b) and (c) respectively indicate the position of the outer wall surface of the furnace body 2 and the position of the inner wall surface of the furnace body 2 within the recess 202 in which the reinforcing rib 35 is arranged (the same applies to Figures 9(b) and (c) described below).

[0046] Furthermore, the width of the recess 202 is set larger than the width of the reinforcing rib 35 so that a gap is formed between the reinforcing rib 35, which thermally expands in response to the temperature inside the furnace body 2 during the treatment of the object to be treated PO, and the inner wall surface of the recess 202. This configuration allows the reinforcing rib 35 to move within the recess 202.

[0047] It is not essential that the step portion be formed by the recess 202. The step portion may be formed by providing anchors protruding from the inner wall surface of the furnace body 2 at positions spaced apart in the rotational or axial direction of the furnace body 2. In this case as well, the base end of the reinforcing rib 35 is positioned in the area sandwiched between these anchors so that a gap is formed between the anchors.

[0048] Using the method described above, the adjustment mechanism 3 is installed at the arrangement positions of the agitation member 30a and the dam member 30b described with reference to Figures 2 to 3B. Hereinafter, the operation of the RK device 1 that treats the treatment object PO using the agitation member 30a and the dam member 30b configured with the adjustment mechanism 3 will be described.

[0049] Once the adjustment mechanism 3 is placed to configure the agitator 30a and the weir member 30b and the RK device 1 is ready for use, the burner 14 heats the interior of the furnace body 2 and rotates the furnace body 2. Then, the supply of the material to be treated PO from the supply unit 11 begins, and the material to be treated PO is treated (FIG. 1, step of supplying the material to be treated PO).

[0050] In this process, each agitator 30a in the furnace body 2 moves in the circumferential direction of the furnace body 2 as the furnace body 2 rotates. More specifically, for example, starting from position D in FIG. 3A, the agitator 30a repeatedly passes through each position: position D → position A → position B → position C → position D → ... In this case, FIG. 5A shows the state of the adjustment mechanism 3 at position A, and FIGS. 5B to 5D show the states of the adjustment mechanism 3 at positions B to D, respectively. In addition, the surface of the protruding member 31 of the adjustment mechanism 3 that intersects with the circumferential direction of the furnace body 2 and faces the rotation direction of the furnace body 2 (the movement direction of the agitator 30a) is called the protruding surface 310.

[0051] When the furnace body 2 is rotated and the agitating member 30a is moved, the agitating member 30a enters the materials to be treated PO accumulated at the bottom of the furnace body 2, passes position D, and lifts up a part of the materials to be treated PO with the protruding member 31 (protruding surface 310). When the protruding member 31 that has lifted the materials to be treated PO passes position A and gradually becomes tilted downward, the materials to be treated PO fall from the protruding member 31. In this way, the materials to be treated PO are repeatedly lifted and dropped, and agitation of the materials to be treated PO progresses (a process of agitating the materials to be treated PO).

[0052] In the above-described stirring operation of the material to be treated PO, the force applied to the support member 32 is maximum at position A before the material to be treated PO lifted by the protruding member 31 falls. At this time, if the support member 32 is fixed by the furnace body 2 (outer shell 20a, lining 20b) as in the stirring blade 3B of the conventional structure described using Figure 11, a large bending stress will be repeatedly applied to the same region as the stress generation portion SP in Figure 11, and the material life of the support member 32 may be significantly shortened.

[0053] In contrast, in the adjustment mechanism 3 of the present embodiment, as described above, gaps are formed between the protruding member 31 and the inner circumferential surface of the through hole 201, and between the reinforcing rib 35 and the inner wall surface of the recess 202, and the adjustment mechanism 3 can move inside the through hole 201 and the recess 202. In this case, when the adjustment mechanism 3 in a state in which it has lifted the object to be processed PO reaches position A, the load of the object to be processed PO on the protruding surface 310 is applied to the protruding member 31 in addition to its own weight, and the protruding member 31 is pressed down in the direction of gravity G.

[0054] When the protruding member 31 is pushed down, the lower end of the reinforcing rib 35 reaches the wall surface of the recess 202 and stops moving, and the outer end of the support member 32 is lifted by the principle of leverage. The adjustment mechanism 3 then stops when the upper surface of the support member 32 reaches the upper surface of the opening of the through-hole 201 (FIG. 5A). In the state shown in FIG. 5A, the force that the adjustment mechanism 3 receives from the furnace body 2 is distributed to two positions T: the position where the reinforcing rib 35 contacts the wall surface of the recess 202, and the position where the upper surface of the support member 32 contacts the opening of the through-hole 201. Therefore, the bending stress acting on each position T of the support member 32 is smaller than when bending stress is concentrated at the stress generating portion SP, as in the conventional stirring blade 3B described with reference to FIG. 11.

[0055] On the other hand, as a comparative example, consider the operation of an adjustment mechanism 3a provided with a locking member 33a that does not have a tapered surface 331, as shown in Figure 6. In this case, even if you try to lift the outer end side of the support member 32 using the principle of leverage, the movement of the outer end side of the support member 32 will stop.

[0056] Specifically, as the protruding member 31 is pushed down and the outer end of the support member 32 is lifted, the locking member 33a eventually comes into contact with the outer wall surface of the furnace body 2 around the opening of the through-hole 201. Unlike the example described with reference to FIG. 5A , the locking member 33a of the comparative example does not have a tapered surface 331 at the position where it contacts the outer wall surface of the furnace body 2. Therefore, the end of the locking member 33a is locked to the outer wall surface of the furnace body 2 through surface contact, preventing the position of the support member 32 within the through-hole 201 from changing. Even if the protruding member 31 is further pushed down in this state, the locking member 33a cannot move. Therefore, bending stress is applied to the support member 32 in the area indicated as the stress generation portion SP in FIG. 6 . As previously mentioned, bending stress applied to the support member 32 shortens the material life of the support member 32.

[0057] Unlike the adjusting mechanism 3a according to the comparative example, in the adjusting mechanism 3 according to the embodiment shown in FIG. 5A, the locking member 33 that contacts the outer wall surface of the furnace body 2 has a tapered surface 331 formed on it. The tapered surface 331 gradually increases in distance to the outer wall surface of the furnace body 2 as it moves away from the opening of the through hole 201. Due to the tapered surface 331, the tapered surface 331 or the upper surface of the support member 32 of the locking member 33 comes into line contact with the edge of the opening of the through hole 201, as shown in FIG. 5A. This contact state prevents the locking member 33 from engaging with the outer wall surface of the furnace body 2 through surface contact when the protruding member 31 is pushed down. Even when the protruding member 31 is pushed down, the tapered surface 331 or the plate surface of the support member 32 can slide along the edge of the opening of the through hole 201 and change its angle using the edge of the opening as a fulcrum. As a result, it is possible to avoid a situation where the locking member 33a comes into surface contact with the outer wall surface of the furnace body 2, as in the case of the locking member 33a in the comparative embodiment, thereby hindering the movement of the outer end of the support member 32 and applying a large bending stress to the support member 32.

[0058] As the adjustment mechanism 3 moves further in the radial direction from position A shown in Fig. 5A, the objects to be treated PO fall from the protruding members 31. Therefore, at positions B (Fig. 5B) and C (Fig. 5C), a force corresponding to its own weight is applied to the adjustment mechanism 3. Furthermore, at position D (Fig. 5D), the protruding members 31 may be buried in the objects to be treated PO, but the load of the objects to be treated PO is mainly applied only to the inner wall surface of the furnace body 2.

[0059] In these cases, in a high-temperature atmosphere, the force exerted by the mechanism's own weight also shortens the lifespan of the materials constituting the adjustment mechanism 3. From this perspective, the tapered surface 331 formed on the locking member 33 also helps to reduce the shortened lifespan of the materials constituting the adjustment mechanism 3 due to its own weight. That is, as shown in FIG. 5C , at position C, the adjustment mechanism 3 is supported in an inclined position within the recess 202 and the through-hole 201 formed on the inner wall surface of the furnace body 2. On the other hand, when the locking member 33a without the tapered surface 331 is provided, as in the comparative adjustment mechanism 3a shown in FIG. 6 , the end of the locking member 33a comes into surface contact with the outer wall surface of the furnace body 2 before the transition from the state shown in FIG. 5B to the state shown in FIG. 5C . As a result, the adjustment mechanism 3a cannot freely change its inclination in response to the rotation of the furnace body 2 toward position C shown in FIG. 5C . On the other hand, the weight of the adjustment mechanism 3a acts to apply bending stress to the support member 32 in an area substantially similar to the area indicated as the stress generating portion SP in Fig. 6 (however, the bending direction is opposite to that in the comparative example shown in Fig. 6). The generation of this bending stress shortens the life of the constituent materials of the adjustment mechanism 3a.

[0060] In contrast, the locking member 33 of this embodiment has a tapered surface 331 or the lower surface of the support member 32 in line contact with the edge of the through-hole 201. Therefore, as the furnace body 2 rotates toward position C shown in FIG. 5C, the tapered surface 331 or the plate surface of the support member 32 can slide along the edge of the through-hole 201 or change its angle using the edge of the opening as a fulcrum. As a result, it is possible to avoid the situation in which the locking member 33a of the comparative embodiment makes surface contact with the outer wall surface of the furnace body 2, which would inhibit the adjustment mechanism 3a from changing its position and cause bending stress (FIG. 5C). Therefore, compared to the adjustment mechanism 3a of the comparative embodiment, it is possible to prevent the shortening of the lifespan of the constituent materials due to the influence of its own weight.

[0061] Returning to the explanation of the overall operation of the RK apparatus 1, the material to be treated PO moves from the inlet side to the outlet side within the furnace body 2 while being agitated by the adjustment mechanism 3a. When the material to be treated PO reaches the outlet of the furnace body 2, it is held back by the weir member 30b, which is a ring of multiple adjustment mechanisms 3. As a result, the material to be treated PO accumulates upstream of the weir member 30b, and the portion of the material to be treated PO that exceeds the height of the adjustment mechanism 3 (protruding member 31) overcomes the weir member 30b and is discharged to the outside as processed material to be treated. In this way, by holding back a portion of the material to be treated PO, a predetermined residence time can be ensured for the material to be treated PO in the area where the weir member 30b is located (a process of adjusting the movement of the material to be treated PO). Here, the height of the weir member 30b is a design variable for adjusting the residence time. That is, as the height of the weir member 30b increases, the residence time of the material to be treated PO increases, and as the height decreases, the residence time decreases.

[0062] As described with reference to FIG. 3B, a gap d is formed between adjacent dam members 30b to prevent contact during thermal expansion. However, when each dam member 30b thermally expands in a high-temperature atmosphere, this gap narrows. Therefore, when the dam members 30b reach positions corresponding to positions A and B described with reference to FIG. 3A, the dam member 30b arranged above may rest on the dam member 30b below. As a result, the dam member 30b below is subjected to not only its own weight but also the load of the dam member 30b above, resulting in greater stress. However, an adjustment mechanism 3 made of plate material is weakest when stress is applied in the thickness direction, which is the smallest dimension. In this regard, at positions A and C, stress is applied to the support member 32 of the adjustment mechanism 3 in the plate width direction (Y'-axis direction also shown in Figure 4(b)) rather than the plate thickness direction (X'-axis direction also shown in Figure 4(c)), so the amount of bending that occurs is relatively small. On the other hand, a pressing force from the object to be treated PO acts in the plate thickness direction of the support member 32, but the load of the object to be treated PO is supported by the underside of the furnace body 2 along the axial direction of the furnace body 2, so the impact of this pressing force is small.

[0063] The adjustment mechanism 3 according to this embodiment has the following advantages. The adjustment mechanism 3 is arranged in the furnace body 2 of the RK device 1. The support member 32, which supports the protruding member 31 for adjusting the state of the material to be treated PO, is configured so that it can be inserted into the through-hole 201 penetrating the furnace body 2 with a gap formed between the support member 32 and the inner circumferential surface of the through-hole 201. This allows the support member 32 to move within the through-hole 201 as the furnace body 2 rotates. Furthermore, the outer end of the support member 32 is provided with a locking member 33 that contacts and locks with the outer wall surface of the furnace body 2 outside the opening of the through-hole 201, thereby preventing the protruding member 31 from falling off into the furnace body. The locking member 33 has a tapered surface 331 in a region that contacts the outer wall surface of the furnace body 2. This configuration prevents the locking member 33 from being locked by surface contact with the outer wall surface of the furnace body 2 when the support member 32 moves within the through-hole 201, thereby reducing stress on the adjustment mechanism 3.

[0064] Here, the locking member 33 is not limited to having a tapered surface 331 in which the distance to the outer wall surface of the furnace body 2 gradually increases with increasing distance from the opening of the through-hole 201. For example, as with the locking member 33b provided in the adjustment mechanism 3b shown in FIG. 7, the tapered surface 331 may be formed so that the distance to the outer wall surface of the furnace body 2 gradually decreases with increasing distance from the opening of the through-hole 201. In this case, the end of the locking member 33b located at the tip of the tapered surface 331 is in line contact with the outer wall surface of the furnace body 2. In other words, it is possible to avoid a state in which the locking member 33b is locked to the outer wall surface of the furnace body 2 through surface contact, and to prevent large bending stress from being applied to the support member 32.

[0065] Note that the configuration of the tapered surface 331 formed on the locking member 33 of the present application is not limited to a case where the inclination angle is constant within the plane. For example, the locking member 33A shown in Fig. 8A has a convex tapered surface 331A whose inclination becomes gentler with increasing distance from the plate surface of the support member 32. On the other hand, the locking member 33B shown in Fig. 8B has a concave tapered surface 331B whose inclination becomes steeper with increasing distance from the contact position with the plate surface of the support member 32. Regardless of whether the locking members 33A and 33B having these tapered surfaces 331A and 331B are arranged as described with reference to Figs. 5A and 7, it is possible to avoid a state in which the locking member 33A and 33B are locked by surface contact with the outer wall surface of the furnace body 2, and to prevent a large bending stress from being applied to the support member 32.

[0066] 9 and 10 show a configuration example and operation diagram of an adjustment mechanism 3a according to a second embodiment. The adjustment mechanism 3a of this example is similar to the fireproof material block 36 described using FIG. 11 in that it is a block shape formed by molding monolithic refractory material around an anchor 322, which differs from the adjustment mechanism 3 according to the first embodiment shown in FIG. 4, in which the adjustment mechanism 3 is made of a plate material.

[0067] As shown in FIG. 10 , when the adjustment mechanism 3 is placed in the furnace body 2, a protrusion 361 is formed at the base end of the refractory block 36, which is located on the inner wall side of the furnace body 2, so that it can be placed in the recess 202 formed on the inner wall side. This protrusion 361 is configured to have a dimension that allows it to move within the recess 202, forming a gap between the protrusion 361 and the side wall of the recess 202 under the temperature conditions inside the furnace body 2 while the RK device 1 is operating. In this example, when the adjustment mechanism 3a is used as the agitator 30a, the recess 202, including the side walls spaced apart along the rotational direction of the furnace body 2, corresponds to the step portion. When the adjustment mechanism 3a is used as the weir member 30b, the recess 202, including the side walls spaced apart along the axial direction of the furnace body 2, corresponds to the step portion. Alternatively, instead of the recess 202, an anchor may be provided to protrude from the inner wall surface of the furnace body 2 to form the step portion.

[0068] The outer end 321 of the support member 32, which is arranged to protrude from the through hole 201, is threaded, and a nut 38 with a diameter larger than the opening dimension of the through hole 201 can be attached as a locking member to prevent the refractory block 36 from falling into the furnace body 2. The surface of this nut 38 facing the outer wall surface of the furnace body 2 is provided with an annular member having, for example, a tapered surface 37.

[0069] As shown in FIG. 10 , even when the adjustment mechanism 3a having the above configuration is used, the load of the lifted material to be treated PO is applied to the adjustment mechanism 3 acting as the agitator 30a, and the pressing force of the held-down material to be treated PO is applied to the adjustment mechanism 3 acting as the weir member 30b. Even in these cases, the adjustment mechanism 3a moves inside the through-hole 201 and the recess 202, the protrusion 361 contacts the wall surface of the recess 202, and the upper surface of the support member 32 contacts the opening of the through-hole 201. In this state, the force acting on the adjustment mechanism 3a is dispersed to two positions T, so that these forces do not apply a large bending stress to the support member 32. The tapered surface 37 formed on the nut 38 of this example may be formed into a convex or concave curved surface, as in the example described with reference to FIGS. 8A and 8B .

[0070] Furthermore, the overall configuration of the adjustment mechanism 3 is not limited to the case where the protruding member 31 and the two support members 32 are formed in a U-shape as in the example shown in Fig. 4. Furthermore, the configuration for preventing the locking members 33, 33b, 33A, 33B from being locked by surface contact with the outer wall surface of the furnace body 2 is not limited to the case where the tapered surfaces 331, 331A, 331B are provided as shown in the examples of Figs. 4, 8A, and 8B.

[0071] An adjustment mechanism 3c according to a third embodiment shown in FIGS. 12 and 13 has a configuration in which another example of the indicator member 32 and the locking member 33c is applied. 12(b), the protruding member 31 and the support member 32a in this example are formed by processing a common metal plate into a T-shape, with the long side of the T being the protruding member 31 and the short side extending from the center position of the protruding member 31 being the support member 32a. Therefore, when the adjustment mechanism 3c is used, one through hole 201 is provided on the furnace body 2 side for each adjustment mechanism 3c.

[0072] 12(a) to 12(c), the locking member 33c in this example is composed of a plate-like member provided along the edge of the outer end portion 321 of the support member 32a. A protrusion 331a is formed on the surface of the locking member 33c facing the outer wall surface of the furnace body 2. For example, the protrusion 331a may be composed of a pyramidal member such as a cone or a polygonal pyramid, and may be arranged with its tip facing the outer wall surface of the furnace body 2. Alternatively, the protrusion 331a may be composed of a hemisphere, with the spherical surface facing the outer wall surface of the furnace body 2.

[0073] 13, in the locking member 33c according to the third embodiment, the protrusion 331a is in point contact with the outer wall surface surrounding the opening of the through-hole 201, preventing the locking member 33c from being locked by surface contact. Therefore, the protrusion 331a, which is in point contact with the outer wall surface surrounding the opening of the through-hole 201, can slide or change its angle with the contact point as a fulcrum in response to the rotation of the furnace body 2. The number of protrusions 331a provided on the locking member 33c is not limited to one, and multiple protrusions 331a may be provided, for example, along the direction in which the end edge of the outer end 321 extends (the Y'-axis direction in FIG. 12(b)).

[0074] Furthermore, the adjustment mechanism 3c shown in Figure 12, in which the protruding member 31 and one support member 32a are formed in a T-shape, may be provided with locking members 33, 33b, 33A, 33B having tapered surfaces 331, 331A, 331B of each example described using Figure 12(c), Figure 7, Figure 8A, and Figure 8B. On the other hand, a protrusion 331a may be provided on the locking member 33 provided on the adjustment mechanism 3 in which the protruding member 31 and two support members 32 are formed in a U-shape as described with reference to Figures 4(a) to (c).

[0075] The above describes an example of application of the adjustment mechanisms 3, 3a to 3c according to the embodiments described with reference to FIGS. 1 to 5D and 7 to 10 to a direct heating type RK apparatus 1 that directly heats the interior of the furnace body 2 using the burner 14. However, the RK apparatus 1 that uses these adjustment mechanisms 3, 3a to 3c to adjust the agitation of the material to be treated PO by the agitator 30a and the movement of the material to be treated PO by the weir member 30b is not limited to a direct heating type. For example, the adjustment mechanisms 3, 3a to 3c may be provided to an indirect heating type RK apparatus 1 that heats the furnace body 2 from the outside by providing a heating coil or a jacket through which a heating fluid flows so as to cover the outer wall surface of the furnace body 2. Furthermore, the adjustment mechanisms 3, 3a to 3c may be provided to an RK apparatus 1 that supplies preheated air into the furnace body 2 and combusts the material to be treated PO within the furnace body 2, without providing a burner 14 or a heating means from the outside of the furnace body 2.

[0076] Furthermore, when the furnace body 2 is provided with the adjustment mechanisms 3, 3a to 3c, it is not essential to provide both the stirring member 30a and the weir member 30b as in the example shown in Figures 1 and 2. It is sufficient to provide at least one of the members 30a and 30b, which have the function of at least one of them.

[0077] Furthermore, it is not essential that the adjustment mechanism 3, which is made of plate material as described with reference to FIG. 4 etc., be made of metal. For example, these components may be made of a material other than metal as long as it is heat resistant under the temperature environment within the furnace body 2 and is less susceptible to cracking or breakage in terms of the processing amount, bulk density, and rotation speed of the furnace body 2 of the material to be treated PO. Examples of non-metallic materials include ceramic materials, carbon fiber molding materials, and polyimide materials. Some polyimide materials have heat resistance of, for example, about 500°C. Furthermore, the protruding member 31, the support member 32, etc. are not limited to being made of plate material, but may be made of rod material such as a round bar or a square bar. [Explanation of symbols]

[0078] PO Processing Object 1 Rotary kiln (RK) equipment 3, 3a Adjustment mechanism 31 Protruding member 32 Support member 33 Locking member 331 Tapered surface

Claims

1. A structure to be placed in a cylindrical furnace body of a rotary kiln apparatus, a protruding member disposed to protrude from an inner wall surface of the furnace body in order to adjust the state of the material to be treated supplied into the furnace body; a support member configured to be inserted into the through-hole penetrating the furnace body with a gap formed between it and the inner peripheral surface of the through-hole, the support member supporting the protruding member at its inner end on the inner wall surface side of the furnace body, and the outer end on the outer wall surface side of the furnace body being arranged to protrude from the opening of the through-hole on the outer wall surface side; A locking member is provided at the outer end of the support member and is engaged with an outer wall surface of the furnace body to prevent the protruding member from falling into the furnace body, A structure characterized in that the locking member has a tapered surface or a protrusion formed thereon to prevent the locking member from being locked to the outer wall surface through surface contact.

2. The structure described in claim 1, characterized in that the protruding member has a protruding surface arranged in a direction intersecting the radial direction of the cylindrical furnace body, moves with the rotation of the furnace body, and is an agitation member for adjusting the agitation state of the object to be treated by lifting a portion of the object to be treated with the protruding surface and then dropping it.

3. The structure described in claim 1, characterized in that the protruding member has a protruding surface arranged toward the axial direction of the cylindrical furnace body, and is a weir member for adjusting the state of movement by holding back a portion of the object to be treated moving along the axial direction with the protruding surface.

4. The structure described in claim 1, characterized in that the protruding member is made of a plate material, and a reinforcing rib is provided on the plate surface of the plate material so as to protrude in a direction intersecting the plate surface and to contact the inner wall of the furnace body and support the protruding member.

5. The structure described in claim 4, characterized in that the base ends of the reinforcing ribs on the inner wall side of the furnace body are arranged inside stepped portions formed on the inner wall at front and rear intervals along the rotation direction or axial direction of the furnace body, and the reinforcing ribs are configured to have dimensions such that gaps are formed between the base ends and the side wall surfaces of the front and rear stepped portions under temperature conditions inside the furnace body while the rotary kiln apparatus is in operation, allowing the reinforcing ribs to move inside the front and rear stepped portions.

6. The structure described in claim 1, characterized in that the protruding member is formed by molding a block of castable refractory material around an anchor provided at the inner end of the support member.

7. The structure described in claim 6, characterized in that the base end of the protruding member on the inner wall side is arranged inside a stepped portion formed on the inner wall at a distance along the rotation direction of the furnace body or the axial direction of the furnace body, and the protruding member is configured with a dimension such that a gap is formed between the base end and the side wall surfaces of the front and rear stepped portions under temperature conditions inside the furnace body while the rotary kiln apparatus is in operation, allowing the protruding member to move within the front and rear stepped portions.

8. A method of using a rotary kiln apparatus, comprising: A step of operating the rotary kiln apparatus with the structure according to claim 2 arranged in the furnace body and supplying a material to be treated to the furnace body; agitating the material to be treated with the agitating member that moves in accordance with the rotation of the furnace body.

9. A method of using a rotary kiln apparatus, comprising: A step of operating the rotary kiln apparatus with the structure according to claim 3 arranged in the 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 weir member to stop the movement of a portion of the object to be treated.

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