JP2006329536A - Pyrolytic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pyrolytic apparatus lengthening the service life of seals and facilitating maintenance by reducing the wear of sealing devices for preventing pyrolyzed gas and heated air from leaking to the atmosphere. <P>SOLUTION: The pyrolytic apparatus 1 comprises a kiln 3 into which a treated object is supplied; a jacket 5 surrounding the outer periphery of the kiln and allowing a heat medium for heating the kiln to be supplied inside; and the sealing devices 10, 10A provided between the kiln 3 and jacket 5 and between the kiln 3 and device fixing parts 2, 8. Each sealing device is composed of a rotating ring 11 fixed to the kiln, and a fixed ring 15 fixed to the jacket 5 to come in contact with the rotating ring. The rotating ring has a cylindrical part extending in the rotation axis direction of the kiln, and the outer peripheral surface of the cylindrical part 11b is formed as an inclined outer peripheral surface 11c. The fixed ring is fixed to the jacket through a bellows 12 expansible along the rotation axis direction of the kiln, and brought into contact with the inclined outer peripheral surface 11c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thermal decomposition apparatus including a rotary kiln type gasification melting furnace that thermally decomposes an object to be processed, and in particular, a thermal decomposition including a sealing device that does not leak a heat medium such as thermal decomposition gas or heated air to the outside of the apparatus. It relates to the device.

  In a pyrolysis apparatus equipped with a rotary kiln type gasification melting furnace, in order to prevent the pyrolysis gas generated in the kiln and the heating gas for heating the kiln from leaking out of the pyrolysis apparatus, a sealing device have.

  As an example of a conventional thermal cracking apparatus, the thermal cracking apparatus shown in FIGS. 4 and 5 is configured such that the garbage 41 brought into the incineration plant is put into the thermal cracking apparatus after passing through a pretreatment process, and then screw feeder 42. Is sent into the kiln from the entrance of the kiln 43 placed horizontally. Garbage in the kiln is decomposed into pyrolysis gas 44 and char 45 by being heated in an atmosphere in which air is blocked while moving toward the outlet, and sent to the respective processing systems. In this process, since aluminum, iron, etc. are processed below the melting point, they are recovered as an incombustible material 46 as it is. On the other hand, the heating gas 47 for heating the garbage heats the kiln by circulating in the forward or reverse direction with respect to the moving direction of the garbage through the path constituted by the kiln 43 and the jacket 48. The garbage in the kiln is supplied with heat from the heated kiln. At this time, the kiln is rotated to uniformly and efficiently supply heat to the garbage.

  The sealing device 50 of the thermal decomposition apparatus has a rotating ring 51 that protrudes from the outer periphery of the kiln 43, and a fixed sealing member 52 that is in contact with one surface of the rotating ring. The fixed sealing member 52 is a kiln. It is fixed to the jacket 48 by a bellows 53 that can expand and contract in the direction of the rotation axis. A fixed seal member 54 is in contact with the other surface of the rotating ring 51, and the fixed seal member 54 is connected by a fixed seal member 52, a bolt 55, and a spring 56. The rotating ring 51 has two fixed seal members 52, 54. Thus, sealing is performed by being sandwiched between the pressed states, and the heated gas inside the jacket 48 is prevented from leaking into the atmosphere. This sealing device is also installed between the kiln 43 and a garbage input unit that is a fixed object, and between the kiln 43 and a hood unit that discharges pyrolysis gas and the like.

  In this way, the rotating ring 51 is disposed at a position perpendicular to the rotation axis of the kiln 43, and the reaction force of the bellows 53 that absorbs the amount of thermal expansion and contraction of the kiln length is generated between the rotating ring 51 and the fixed seal member 52. It is structured to receive on the sealing surface. The bellows 53 is made of a material such as stainless steel in order to withstand the high temperature pyrolysis gas inside the kiln, and the expansion and contraction amount is proportional to the length of the long kiln, so that the bellows reaction force is large. As a result, FIG. As shown, the surface pressure of the sealing surface is also increased.

In addition, as shown in FIG. 6, the rotary kiln seal device described in Patent Document 1 is provided with a movable seal ring 62 along the outer periphery of the rotary kiln 61 and at a position facing the movable seal ring on the fixed side. The seal ring 63 is arranged, and the fixed-side seal ring 63 is pressed against the movable-side seal ring 62 with a constant pressure. And means for pressing at a constant pressure includes a fluid pressure supply device 65, a pressure detector 67 provided in the middle of the fluid pressure pipe 66 for detecting the fluid pressure, and a pressure control device 68 for controlling the fluid pressure constant. The fluid pressure can be supplied to the bag body 69 configured and extendable.
JP 2003-269864 A

In the sealing device of the rotary kiln type thermal decomposition apparatus, when the kiln is thermally expanded during operation, the thermal expansion / contraction absorbing bellows is extended and presses the sealing surface. As a result, there arises a problem that the surface pressure of the seal surface increases, wear increases, and the life of the seal member is shortened. As shown in FIG. 3, the seal surface pressure tends to increase due to the expansion of the bellows. In this type of seal structure, the extension amount of the bellows is set to about 140 mm, but the seal surface pressure at this time changes to about 1 to 10 N / mm ² . Therefore, the seal surface was excessively worn and the seals had to be replaced frequently.

  The sealing device of the rotary kiln described in Patent Document 1 prevents the fluctuation of the seal surface pressure as described above, and is configured to press the fixed-side seal ring against the movable-side seal ring with a constant pressure. ing. However, this sealing device is an expandable and contractible bag body in which the means for pressing at a constant pressure can supply fluid pressure. The fluid pressure supply device for supplying fluid pressure, the pressure detector for detecting fluid pressure, and the measured pressure Therefore, a pressure control device that controls the fluid pressure to be constant is required, and there is a problem that the configuration is complicated and the control is complicated.

  The present invention has been made in view of such problems, and an object of the present invention is to act on a seal portion during expansion and contraction due to thermal expansion of the kiln during operation in a thermal decomposition apparatus including a rotary kiln. It is an object of the present invention to provide a thermal decomposition apparatus capable of reducing wear by reducing the reaction force of the bellows and reducing the surface pressure of the seal portion, extending the life of the seal device, and facilitating maintenance. Another object of the present invention is to provide a thermal decomposition apparatus capable of improving the sealing performance of the sealing apparatus and preventing the pyrolysis gas and heated air from leaking into the atmosphere.

  In order to achieve the above object, a thermal decomposition apparatus according to the present invention is a thermal decomposition apparatus including a rotatable kiln in which a workpiece is supplied and thermally decomposes the workpiece, A sealing device is provided between the kiln and the device fixing portion, and the sealing device is fixed to the device fixing portion so as to be in contact with the rotating side sealing member fixed to the kiln and the rotating side sealing member. The rotation-side seal member has a cylindrical portion extending in the direction of the rotation axis of the kiln, and the outer peripheral surface of the cylindrical portion is formed on the inclined outer peripheral surface. The seal member is fixed to the device fixing portion via an expansion / contraction member that can expand and contract along the direction of the rotation axis of the kiln and is in contact with the inclined outer peripheral surface.

  In the thermal decomposition apparatus of the present invention configured as described above, the kiln rotates when the object to be processed is thermally decomposed, and pyrolysis gas and heated air are generated from the sealing device between the rotating kiln and the apparatus fixing portion. A seal is made to prevent leakage. When the kiln is heated and thermally expanded, the expansion and contraction members such as bellows are expanded and contracted, and the pressing force of the sealing surface changes. This pressing force acts on the inclined outer peripheral surface of the cylindrical part, so the change in pressing force is small. It becomes. Thus, since the thermal expansion direction of the kiln and the direction of the seal surface are in elastic contact with the inclined surface that is nearly parallel, the surface pressure applied to the seal surface does not change significantly. For this reason, the sealing performance is stable, the internal gas is prevented from leaking, and the life of the sealing device can be extended. That is, the expansion / contraction direction of the bellows is a direction along the rotation axis, the direction of pressing the rotation side seal member of the fixed side seal member is a direction along the inclined outer peripheral surface, and the pressing direction and the contact surface are perpendicular to each other as in the past. Therefore, the surface pressure applied to the seal surface can be kept small.

  Moreover, as a preferable specific aspect of the thermal decomposition apparatus according to the present invention, the rotation-side seal member has an inner peripheral surface of a cylindrical portion formed on an inclined inner peripheral surface. A fixed-side inner peripheral seal member that contacts the surface, and the fixed-side seal member and the fixed-side inner peripheral seal member are biased so as to sandwich the inclined outer peripheral surface and the inclined inner peripheral surface of the cylindrical portion. It is characterized by that.

  According to this configuration, since the rotation-side seal member is sealed with the inclined outer peripheral surface and the inclined inner peripheral surface sandwiched between the fixed-side inner peripheral seal member and the fixed-side outer peripheral seal member, the sealing performance is stable and preferable. . That is, the fixed side seal member on the outer peripheral side and the fixed side inner seal member are biased so as to sandwich the inclined outer peripheral surface and the inclined inner peripheral surface of the cylindrical portion of the rotating side seal member. The fixed-side inner peripheral sealing member is self-aligned to reliably suppress leakage from the seal portion.

  Furthermore, it is preferable that at least one of the fixed-side seal member and the fixed-side inner peripheral seal member includes a groove portion that holds a lubricant. According to this configuration, at least one of the contact surface between the inclined outer peripheral surface and the fixed outer peripheral seal member and the contact surface between the inclined inner peripheral surface and the fixed inner peripheral seal member is lubricated with the lubricant. Protection and low noise can be achieved, and wear of the seal portion can be reduced. Moreover, it is preferable that at least one of the rotation side seal member, the fixed side seal member, and the fixed side inner peripheral seal member is made of chromium molybdenum steel or coated with chromium molybdenum steel. According to this structure, since chromium molybdenum steel has high hardness, the lifetime of a sealing device can be extended.

  According to the present invention, in the thermal decomposition apparatus including the rotary kiln, the rotation side seal member of the rotating kiln and the fixed side seal member of the apparatus fixing unit are brought into contact with each other on the inclined surface, so that the surface pressure due to thermal expansion and contraction is released. In addition, since the contact pressure of the contact surface of the seal member can be reduced, the life of the seal device can be extended. Further, since the surface pressure of the sealing device can be reduced, sealing performance is stabilized, noise can be reduced, and the life of the sealing device can be extended, so that maintenance such as replacement of the sealing member is facilitated.

  Hereinafter, one embodiment of a thermal decomposition apparatus concerning the present invention is described in detail based on a drawing. 1 is a cross-sectional view showing a schematic structure of a thermal decomposition apparatus according to the present embodiment, FIG. 2 is a cross-sectional view showing the details of the sealing apparatus of FIG. 1, and FIG. It is a figure which shows the relationship of surface pressure.

  1 and 2, a thermal decomposition apparatus 1 according to the present embodiment is an apparatus that thermally decomposes and incinerates waste as an object to be processed by a gasification melting method, and has a basic configuration with the conventional thermal decomposition apparatus shown in FIG. Is the same, and after separating the waste into pyrolysis gas and pyrolysis carbon (char), the ash is melted by charging char and ash into a melting furnace (not shown) heated to high temperature by pyrolysis gas. It is a slag.

  This type of thermal decomposition equipment can treat the waste at high temperature, so it can suppress the generation of dioxins, and the final product slag can be effectively used for building materials, etc., greatly reducing the amount of landfill to the final disposal site it can. Furthermore, since this thermal decomposition apparatus covers these treatments with the energy possessed by the garbage, there is a feature that the external energy required for the waste treatment can be greatly reduced.

  The thermal decomposition apparatus 1 which comprises a gasification melting furnace is comprised as an apparatus provided with the kiln rotatably supported by the center part. The thermal decomposition apparatus 1 includes an input hood 2 having an input port 2a for inputting garbage brought into the incineration site on one end side (left side) of the kiln 3. Below the input port 2, a screw feeder 4 for conveying the input waste is installed, and the waste is supplied into the kiln 3 by this screw feeder. The kiln 3 is supported at both ends by a bearing mechanism (not shown) and is rotated at a low speed by a rotary drive mechanism (not shown).

  A jacket 5 is installed as a combustion chamber on the outer periphery of the kiln 3, and a pyrolysis gas burner (not shown) for burning the pyrolysis gas generated in the kiln 3 is installed upstream of the jacket 5. The jacket 5 is fixed to the base of the thermal decomposition apparatus 1, and the kiln 3 rotates around the inner periphery of the jacket 5 that is an apparatus fixing portion. The kiln 3 is heated from the outer periphery by the heated gas 6 supplied into the jacket 5, and the garbage in the kiln 3 is heated in an atmosphere in which air is blocked while the garbage moves to the right in FIG. By doing so, it is decomposed into pyrolysis gas 6 and char 7 and sent to the respective processing systems from the upper and lower outlets of the discharge hood 8 located on the other end side (right side) of the kiln 3. In this process, since aluminum, iron, etc. are processed below the melting point, they are recovered as incombustible material 9 as it is.

  The heated air 6 supplied into the jacket 5 for heating the waste is circulated in a forward or reverse direction with respect to the moving direction of the waste through a path formed by the kiln 3 and the jacket 5. Heat from the outer periphery. The waste in the kiln is supplied with heat from the heated kiln and is thermally decomposed. At this time, the kiln is rotated to uniformly and efficiently supply heat to the garbage. The pyrolysis gas 6 obtained from the pyrolysis apparatus 1 is supplied into the jacket 5 after being combusted by a pyrolysis gas burner (not shown) and used for heating the kiln 3.

  The pyrolysis gas generated in the kiln contains combustion gases such as carbon monoxide, hydrogen, and hydrocarbons. It contains harmful gases such as carbon monoxide and has an odor, so it leaks into the atmosphere. It is not possible. Further, the heating gas 6 obtained by heating the pyrolysis gas with the pyrolysis gas burner also contains a toxic gas, and therefore cannot be leaked from the jacket 5 to the atmosphere.

  Therefore, between the device fixing part of the pyrolysis apparatus that is a path of pyrolysis gas and heated air and the rotary kiln 3 that generates pyrolysis gas, these gases are prevented from leaking into the atmosphere. It is necessary to have a sealing device for this purpose. These sealing devices require a sealing device 10 at a joint portion between the rotating kiln 3 and the jacket 5 serving as a fixed portion, and a sealing device 10A at a joint portion between the rotating kiln 3 and the garbage input hood 2. Although not shown, a sealing device is also required between the discharge hood 8 and the kiln 3. These sealing devices 10 and 10A may basically have the same structure. Therefore, details of the structure of the sealing device used in the thermal decomposition apparatus 1 according to the present embodiment will be described below by taking as an example the sealing device 10 at the joint portion between the rotating kiln 3 and the jacket 5 that is a device fixing portion.

  In FIG. 2, two mounting ribs project from the outer periphery of the kiln 3 along the circumferential direction, and a rotating ring 11 constituting a rotating side seal member is fixed to the mounting rib by a bolt nut or the like. . The rotating ring 11 is composed of a collar portion 11a fixed to the kiln 3, and a cylindrical portion 11b extending from the collar portion in the direction of the rotation axis of the kiln. It is formed on the inclined outer peripheral surface 11c whose radius gradually decreases along the direction. That is, the radius R2 of the distal end portion is formed smaller than the radius R1 of the proximal end portion, and an intermediate portion thereof is an inclined surface, and the gradient of the inclined surface is preferably about 1/10 to 1/20. Thus, the inclined outer peripheral surface 11c is a surface corresponding to the outer peripheral surface of the truncated cone.

  Further, the inner peripheral surface of the cylindrical portion 11b is formed as an inclined inner peripheral surface 11d whose radius gradually increases along the extending direction. That is, the radius R3 of the distal end portion is formed larger than the radius R4 of the proximal end portion, and an intermediate portion thereof is formed on an inclined surface in which the radius gradually changes linearly. The gradient of the inclined inner peripheral surface 11d is preferably about 1/10 to 1/20, which is the same as that of the inclined outer peripheral surface 11c. As a result, the cross-sectional shape of the cylindrical portion 11b is formed in a wedge shape that becomes narrower from the proximal end portion in the extending direction toward the distal end portion. The center line of the wedge is parallel to the rotation axis of the kiln 3.

  The rotating ring 11 is formed of a metal material in which a collar portion 11a and a cylindrical portion 11b are integrally formed, and the inclined outer peripheral surface 11c and the inclined inner peripheral surface 11d of the cylindrical portion 11b are polished and smooth surfaces. It is preferable that Although the example in which the rotating ring 11 is fixed to the mounting rib on the outer peripheral surface of the kiln 3 with a bolt and nut is shown, it may be directly fixed by welding or the like. The rotating ring 11 is made of stainless steel or the like, but it is preferable to use chromium molybdenum steel having high hardness. Alternatively, it may be formed of stainless steel and the surface is coated with chromium molybdenum steel to increase the surface hardness.

  On the other hand, a gap is formed between the fixed-side jacket 5 located on the outer peripheral side of the kiln 3 and the rotating kiln 3, and a bellows 12 that can expand and contract in the direction of the rotation axis of the kiln is fixed to the gap portion. . The bellows 12 is formed such that a metal plate material such as a stainless steel plate is bent in a U shape, and then bent in an inverted U shape. The amount of expansion and contraction can be increased by increasing the number of curves, and the number of curves of the bellows U and the reverse U are set according to the shape of the kiln or jacket.

  One end of the bellows 12 is fixed in an airtight state along the circumference of the jacket 5, and an outer peripheral fixing ring 15 is fixed in an airtight state at the other end of the bellows. The fixing ring 15 has two seal portions 17 and 18 extending in the kiln direction projecting from the base portion 16 extending in the rotation axis direction of the kiln with a gap therebetween, and the tip ends of the two seal portions are the rotation ring 11. In contact with the inclined outer peripheral surface 11c. Therefore, the front end surfaces of the two seal portions are continuous inclined surfaces having the same gradient as the inclined outer peripheral surface 11c of the rotating rib. A groove formed between the two seal portions 17 and 18 is filled with a lubricant 19 such as grease and held.

  As described above, the outer peripheral fixing ring 15 is in contact with the inclined outer peripheral surface 11c of the cylindrical portion 11b of the rotating ring 11, but in the present embodiment, the inclined inner peripheral surface 11d of the cylindrical portion 11b is further contacted. Also, the inner periphery fixing ring 20 is in contact. In this inner peripheral fixing ring 20, two inner peripheral seal portions 22, 23 extending from the base portion 21 in the outer peripheral direction of the kiln are projected with a gap, and the outer peripheral ends of the two inner peripheral seal portions are rotated. The ring 11 is in contact with the inclined inner peripheral surface 11d. The two inner peripheral seal portions 22 and 23 are set to face the two outer peripheral seal portions of the outer peripheral fixing ring. Therefore, the tip surfaces of the two seal portions are continuous inclined surfaces having the same gradient as the inclined inner peripheral surface 11d of the rotating rib. A groove formed between the two seal portions 22 and 23 is filled with a lubricant 24 such as grease and held.

  The outer peripheral side fixing ring 15 and the inner peripheral fixing ring 20 are connected by a plurality of connecting portions 25 on the circumference. Therefore, the inner peripheral fixing ring 20 is fixed to the jacket 5 via the plurality of connecting portions 25 and the outer peripheral fixing ring 15. That is, a plate-like outer peripheral support portion 26 projects from the surface opposite to the bellows fixing surface of the fixing ring 15 on the outer peripheral side, and similarly, the inner peripheral support portion faces the support portion 26 on the inner peripheral fixing ring 20. 27 is protruded, a long bolt 28 is passed through the through holes of both support portions, a nut 28a is screwed into an end portion of the bolt, and a compression spring 29 is interposed between the head portion of the bolt and the outer peripheral support portion. It is installed. With this configuration, the outer peripheral fixing ring 15 is elastically contacted with the inclined outer peripheral surface 11c of the rotating ring 11, the inner peripheral fixing ring 20 is elastically contacted with the inclined inner peripheral surface 11d, and the cylindrical portion 11b of the rotating ring 11 is the outer peripheral surface. It is configured to be sandwiched between the side fixing ring 15 and the inner peripheral fixing ring 20 and urged.

  The rotating ring 11 fixed to the kiln 3 is made of stainless steel or the like as described above, and the outer peripheral fixing ring 15 and the inner peripheral fixing ring 20 that contact the cylindrical portion 11b of the rotating ring 11 are made of stainless steel or carbon steel. Etc. are used. Further, the fixing ring 15 and the inner peripheral fixing ring 20 may be formed of chrome molybdenum steel, or may be coated with chrome molybdenum steel. In this way, the rotating kiln 3 and the fixed-side jacket 5 are sealed by metal contact, and the lubricants 19 and 24 are supplied to the seal portion so as to smoothly slip in an airtight state.

  The metal contact sealing device 10 includes a rotating ring 11 on the rotating side, a fixing ring 15 on the fixed side, and an inner peripheral fixing ring 20, and at least one of the three members is formed of chromium molybdenum steel. It is preferable that the surface treatment (coating) of chromium molybdenum steel is performed. The hardness of the contact portion is set so that the outer ring-side fixing ring 15 and the inner periphery fixing ring 20 that are fixed portions are worn quickly and the rotation ring 11 is worn slowly so that the hardness of the rotating ring is increased. Since the fixing ring 15 on the outer peripheral side and the inner peripheral fixing ring 20 are worn out early, this member may be replaced. Moreover, you may form all the members to contact with a member of high hardness.

  The operation of the thermal decomposition apparatus 1 of the present embodiment configured as described above will be described below. The pyrolysis apparatus 1 is started, the kiln 3 is rotated, the heated gas 6 burned by the pyrolysis gas burner is supplied into the jacket 5, and garbage is introduced from the inlet 2a. Garbage is conveyed into the kiln 3 by the screw feeder 4 and heated from the outer jacket 5 and conveyed. Garbage is pyrolyzed while being conveyed and decomposed into pyrolysis gas 6 and char 7. The char 7 is discharged from below the discharge hood 8 of the pyrolysis apparatus 1, and the pyrolysis gas 6 is discharged from above the discharge hood 8, supplied to the jacket 5 and used for heating in the kiln 3.

  In the pyrolysis step, the rotating kiln 3 is thermally expanded, and is particularly absorbed in the sealing device 10 shown in FIG. 2 because the expansion in the direction along the rotation axis which is the longitudinal direction is large. When the kiln 3 rotates, the rotating ring 11 rotates with the kiln 3 at the same rotational speed. The cylindrical portion 11b of the rotating ring 11 is sealed by elastically contacting the two sealing portions 17 and 18 of the outer fixing ring 15 to the inclined outer peripheral surface 11c, and two inner fixing rings 20 on the inclined inner peripheral surface 11d. Since the sealing portions 22 and 23 are elastically contacted and sealed, the pyrolysis gas in the jacket 5 does not leak into the atmosphere. Since the seal portion 10 is lubricated by the lubricants 19 and 24 filled between the two seal portions, wear can be reduced and gas leakage can be further prevented.

  When the kiln 3 is heated, thermal expansion occurs, and in particular, thermal expansion in the longitudinal direction increases. This expansion is absorbed by the bellows 12. Since the thermal expansion is absorbed by the bellows, the positional relationship between the rotating ring 11 of the sealing device, the outer peripheral fixing ring 15 and the inner peripheral fixing ring 20 is not changed, and pyrolysis gas or the like is generated from the seal portions 10 and 10A. There is no leakage. Since the thermal expansion in the outer peripheral direction of the kiln 3 is also absorbed by the bellows 12, leakage of pyrolysis gas and heated air can be prevented. Further, since the change in the seal surface pressure due to the expansion and contraction of the bellows 12 acts on the inclined outer peripheral surface 11c and the inclined inner peripheral surface 11d, the seal surface pressure does not change greatly, and the seal surface pressure can be kept small. it can.

  The outer peripheral fixing ring 15 that is the outer seal member and the inner peripheral fixing ring 20 that is the inner seal member are formed such that the cylindrical portion 11b of the rotating ring 11 is formed in a wedge shape with an inclined surface, and the inclined surface 11c, Since the outer peripheral side fixing ring 15 and the inner peripheral fixing ring 20 are in elastic contact with 11d, there is no gap in the seal portion, and the pyrolysis gas inside the kiln 3, the pyrolysis gas inside the jacket 5, heating air, etc. Will not leak to the outside. Similarly, the sealing device 10A for the kiln 3 and the charging hood 2 and the discharging hood 8 which are fixed portions is sealed so that the internal gas does not leak into the atmosphere.

  In the thermal decomposition apparatus 1 configured as described above, wear occurs in the contact portion of the sealing device due to long-term operation, and the contact portion between the inclined outer peripheral surface 11c and the outer peripheral fixing ring 15, and the inclined inner peripheral surface 11d. When a gap is generated at the contact portion between the outer peripheral side fixing ring 20 and the outer peripheral side fixing ring 15, the outer peripheral side fixing ring 15 and the inner peripheral fixing ring 20 are biased in the direction narrowed by the compression spring 29. 2 and the inner peripheral fixing ring 20 move slightly in the right direction in FIG. 2 relative to the rotating ring 11, eliminating a gap due to wear of the seal portion, and so on. Leakage is prevented. Since the relative movement is absorbed by the bellows 12, it does not interfere with the thermal expansion and contraction of the kiln 3.

  Further, in FIG. 2, when the bellows 12 is extended, there is a gap between the outer peripheral fixing ring 15 and the inclined outer peripheral surface 11c of the rotating ring 11, and between the inner peripheral fixing ring 20 and the inclined inner peripheral surface 11d. However, since the outer peripheral fixing ring 15 and the inner peripheral fixing ring 20 are biased to approach each other by the compression spring 29, the inclined outer periphery of the fixing ring 15 and the rotating ring 11 is not generated. The inner peripheral fixing ring 20 and the inclined inner peripheral surface 11d of the rotating ring 11 are in close contact with the surface 11c, and the heated air and pyrolysis gas inside the jacket 5 and kiln 3 do not leak to the outside.

During the operation of the thermal decomposition apparatus, the expansion / contraction amount of the bellows 12 at the time of thermal expansion / contraction in the axial direction of the kiln 3 is about 140 (mm) in total. When the pyrolysis apparatus 1 using such bellows 12 is operated, in Example 1, the force of the compression spring 29 is mainly affected by the reaction force due to the bellows expansion and contraction, and the sealing surface as shown in FIG. The maximum pressure was about 2 (N / mm ² ).

On the other hand, in the case of the prior art, since it is affected by both the tightening force of the spring 56 and the reaction force due to the bellows expansion and contraction during the axial thermal expansion and contraction of the kiln 3, the bellows side as shown in FIG. The maximum seal surface pressure was about 10 (N / mm ² ). The surface pressure in the case of Example 1 is about 20% in the case of the prior art, and therefore the seal life can be extended by about 5 times.

  Thus, during operation of the thermal decomposition apparatus 1, pressure changes due to expansion and contraction of the bellows 12 are not directly applied to the contact surfaces of the rotating ring 11, the outer peripheral side fixing ring 15 and the inner peripheral fixing ring 20 of the sealing devices 10 and 10A. Further, since it is added to the inclined outer peripheral surface 11c and the inclined inner peripheral surface 11d with gentle slopes, the seal surface pressure can be greatly reduced. As a result, since the wear of the seal portion can be greatly reduced, the seal performance is stable, the replacement cycle of the wear parts of the seal device can be greatly extended, and maintenance is facilitated. Moreover, since the seal surface pressure of the seal portion can be reduced, noise during operation can also be reduced.

  Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention described in the claims. Design changes can be made. For example, the material of the rotating ring, the outer peripheral fixing ring, and the inner peripheral fixing ring is not limited to metal, and ceramic or the like can also be used. Further, wear may be reduced by forming the rotating ring of metal and coating the inclined surface with ceramic or the like.

  When the rotating ring, the outer peripheral fixing ring and the inner peripheral fixing ring are made of metal, it is preferable to increase the hardness of the rotating ring. For example, it is preferable that the rotating ring is made of chrome molybdenum steel, and the fixing ring and the inner peripheral fixing ring are made of stainless steel. The surface of the rotating ring may be coated with chromium molybdenum steel to increase the hardness. Further, the rotating kiln may be of a type that does not rotate along the horizontal axis but rotates along the vertical axis.

  As an application example of the present invention, the present invention is not limited to an apparatus that thermally decomposes incineration waste, but can be applied to an apparatus that thermally decomposes an object to be processed such as raw materials in various plants.

Sectional drawing which shows schematic structure of one Embodiment of the thermal decomposition apparatus which concerns on this invention. FIG. 2 is a main part cross-sectional view showing details of the sealing device of FIG. 1. The figure which shows the relationship between the kiln axial direction bellows expansion-contraction amount of a prior art and the thermal decomposition apparatus of this invention, and a seal surface pressure. The figure which shows the example of the structure of the thermal decomposition apparatus which is a prior art. Sectional drawing of the principal part of the sealing device of the thermal decomposition apparatus shown in FIG. The block diagram which shows the schematic cross section of the sealing device of the conventional rotary kiln.

Explanation of symbols

  1: pyrolysis device, 2: input hood (device fixing portion), 3: kiln, 5: jacket (device fixing portion), 8: discharge hood (device fixing portion), 10, 10A: sealing device, 11: rotating ring (Rotary side seal member), 11b: cylindrical portion, 11c: inclined outer peripheral surface, 11d: inclined inner peripheral surface, 12: bellows (expandable member), 15: outer peripheral fixing ring (fixed side sealing member), 17, 18: outer periphery seal portion, 19, 24: lubricant, 20: inner periphery fixing ring (fixed side seal member), 22, 23: inner periphery seal portion, 25: connecting portion, 26: outer periphery support portion, 27: inner periphery Support part, 28: bolt, 28a: nut, 29: compression spring

Claims (4)

A pyrolysis apparatus comprising a rotatable kiln in which a workpiece is supplied and thermally decomposes the workpiece,
The device includes a sealing device between the kiln and the device fixing portion,
The seal device includes a rotation side seal member fixed to the kiln, and a fixed side seal member fixed to the device fixing portion so as to come into contact with the rotation side seal member.
The rotation side seal member has a cylindrical portion extending in the rotation axis direction of the kiln, and an outer peripheral surface of the cylindrical portion is formed on an inclined outer peripheral surface,
The fixed-side seal member is fixed to the device fixing portion via an expansion / contraction member that can expand and contract along the rotation axis direction of the kiln and is in contact with the inclined outer peripheral surface. . The rotation side seal member is formed such that an inner peripheral surface of the cylindrical portion is an inclined inner peripheral surface,
The thermal decomposition apparatus further includes a fixed inner circumferential seal member that comes into contact with the inclined inner circumferential surface,
The thermal decomposition apparatus according to claim 1, wherein the fixed-side seal member and the fixed-side inner peripheral seal member are biased so as to sandwich the inclined outer peripheral surface and the inclined inner peripheral surface of the cylindrical portion.   The thermal decomposition apparatus according to claim 1, wherein at least one of the fixed-side seal member and the fixed-side inner peripheral seal member includes a groove portion that holds a lubricant.   The at least one of the rotation-side seal member, the fixed-side seal member, and the fixed-side inner peripheral seal member is formed of chromium molybdenum steel or coated with chromium molybdenum steel. The thermal decomposition apparatus in any one of 1-3.

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