JP2007107812A - Kiln repairing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a kiln repairing method, capable of repairing a damaged part of a kiln without affecting the function or performance of the kiln. <P>SOLUTION: In the kiln repairing method for a pyrolysis device including a cylindrical kiln for thermally decomposing waste material into a pyrolysis gas and a pyrolytic residue containing pyrolytic carbon, an outer cylinder 20 having an inside surface of a curvature radius R1 substantially equal to the curvature radius of the outer circumferential surface of the circumferential wall 3a of a rotary kiln 3 is fixed to a damaged part of the circumferential surface while bonding its outer peripheral part to the outer circumferential surface of the rotary kiln. Thereafter, a removal part 3d including the damaged part is removed from the outer circumferential wall of the rotary kiln covered with the outer cylinder while leaving the outer peripheral part to which the outer cylinder is bonded by a width W1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for repairing a cylindrical kiln of a pyrolysis apparatus that thermally decomposes waste into pyrolysis gas and pyrolysis residue containing pyrolysis carbon, and in particular, a heat provided with a gasifier such as a rotary kiln system. The present invention relates to a method for repairing a kiln used in a decomposition apparatus.

  Since the gasification melting furnace processes waste at a high temperature, the volume reduction rate of waste can be greatly increased, and the amount of dioxins generated during waste processing can be suppressed. In addition, since these treatments are covered with the energy of the waste, the great feature is that the external energy required for the waste treatment is greatly reduced. The rotary kiln, one of the major equipment of this gasification and melting furnace, separates pyrolysis gas and pyrolysis carbon from waste (hereinafter referred to as garbage), and mainly contains an inorganic compound called ash. It is transformed into a substance. Incombustible materials such as iron and aluminum have a thermal decomposition temperature of 400 to 500 ° C., and are recovered as metal pieces without being treated.

  The pyrolysis gas generated in the rotary kiln is heated by the pyrolysis gas burner, then refluxed to the rotary kiln side, and reused for heating the rotary kiln. On the other hand, pyrolytic carbon called char is put into a melting furnace together with ash. Since the melting furnace is maintained at a high temperature by the combustion of char, the ash is slagged and recovered as a final product. The collected slag is effectively used as building materials.

  Garbage thrown into the rotary kiln is thermally decomposed while being stirred by the rotation of the rotary kiln. The pyrolysis gas generated in the process contains highly corrosive substances such as chlorine compounds and sulfur compounds. Therefore, if these substances come into contact with the rotary kiln material at a high temperature, the rotary kiln is caused by general corrosion. Possible damage. In particular, if the thickness of the rotary kiln is reduced due to overall corrosion or the like, deformation of the rotary kiln is concerned, and if cracking occurs due to stress corrosion cracking or the like, brittle fracture of the rotary kiln is concerned.

  For this reason, it is common to use a highly corrosion-resistant material for the rotary kiln material, and a coating with high corrosion resistance may be coated on the surface of the rotary kiln material. In addition, improvement of operating conditions such as mitigating corrosion by lowering the operating temperature of the rotary kiln within a range in which waste can be pyrolyzed has been promoted. However, despite such efforts, corrosion damage may occur depending on the environment in the rotary kiln. If the rotary kiln is damaged, it is necessary to repair the damaged part in order to ensure the safety and reliability of the rotary kiln.

When a cylindrical kiln such as a rotary kiln is damaged, it is necessary to repair the damaged part in order to ensure the safety and reliability of the rotary kiln. As a method of repairing the damaged part of the rotating body rolling surface of the rotary kiln, the repairing method of the damaged part of the rotating body rolling surface described in Patent Document 1 forms a recess by deleting the region including the damaged part of the base material. Then, the damaged portion is repaired by embedding an embedding member that is tightly fitted and filled in the concave portion and fixing it.
JP-A-7-27482

  However, the repair method of the damaged part of the rotating body rolling surface described in Patent Document 1 is extremely partial. If the plate thickness is reduced over a wide range of the rotary kiln due to general corrosion, etc., safe and stable operation may be hindered due to deformation and cracking of the rotary kiln. Therefore, the establishment of a method for repairing damage that occurs over a wide range of the rotary kiln is an issue. When the damaged part covers a wide range, such as the entire surface corrosion of the rotary kiln, it is difficult to apply the repair method disclosed in Patent Document 1.

  The present invention has been made in view of such problems, and the object of the present invention is to prevent damaged parts such as a cylindrical kiln of a thermal decomposition apparatus without affecting the function and performance of the kiln. It is to provide a kiln repair method that can be repaired. Another object of the present invention is to provide a kiln repairing method that can be easily repaired even when a damaged part of the rotary kiln is large.

  In order to achieve the above object, a kiln repairing method according to the present invention is a kiln repairing method for a pyrolysis apparatus comprising a cylindrical kiln for pyrolyzing an object to be treated such as waste, and an outer periphery of the kiln. An outer cylinder having an inner peripheral surface with a radius of curvature based on the radius of curvature of the outer peripheral surface of the outer peripheral wall is fixed to the damaged portion of the wall by joining the outer peripheral peripheral portion to the outer peripheral surface of the kiln by welding or the like. It is characterized by doing. The curvature radius of the outer peripheral surface of the outer peripheral wall is set substantially equal to the curvature radius of the inner peripheral surface of the outer cylinder. That is, the damaged part can be repaired without affecting the function and performance of the kiln by fixing and covering the damaged outer part of the kiln of the pyrolyzer with a healthy outer cylinder without damage.

  In the kiln repair method of the present invention configured as described above, when the outer peripheral wall of the kiln is damaged, the radius of curvature is substantially equal to the radius of curvature of the outer peripheral surface of the outer peripheral wall of the kiln so as to cover the damaged portion. The outer cylinder having the inner peripheral surface of the outer cylinder is installed so as to be in close contact with the outer peripheral surface of the outer peripheral wall, and the outer peripheral peripheral edge of the outer cylinder is joined and fixed to the outer peripheral surface of the outer peripheral wall of the kiln. Cover and fix with an outer cylinder. Thus, since the damaged part of a kiln is covered and repaired with an outer cylinder, even if the area of the damaged part of the outer peripheral wall of a kiln is large, it can repair easily. In particular, when the damaged portion of the outer peripheral wall of the kiln is small, it can be easily repaired only by joining the outer cylinder at its outer peripheral edge.

  As another aspect of the kiln repairing method according to the present invention, the outer cylinder is fixed to the outer peripheral surface of the outer peripheral wall of the kiln, and then the outer peripheral wall of the kiln covered with the outer cylinder is connected to the outer cylinder. It is characterized in that it is removed leaving the joined outer peripheral edge. That is, the inner kiln outer peripheral wall covered with the outer cylinder is removed from the inner side of the kiln leaving the joined outer peripheral edge, and the two-layer portion of the repaired portion is made into one layer. In this way, by removing the damaged portion from the inside after covering, it can be repaired by replacing it with a healthy member having no damage.

  When the outer peripheral wall of the kiln is damaged, the outer cylinder is applied from the outside of the outer peripheral wall so that the damaged portion is covered, and the outer peripheral edge of the outer cylinder is placed on the outer peripheral surface of the kiln. It is bonded and fixed, and the damaged portion is covered to form a two-layer structure. Thereafter, since the outer peripheral wall on the inner side of the two-layer portion is removed leaving the outer peripheral edge portion, the repaired portion of the kiln becomes a one-layer structure and does not hinder heating to the waste moving inside. In particular, when the damaged part is large and the outer cylinder for repair is a large area, the heat transfer efficiency can be made the same as before repair by making the two-layer part by repair into one layer. And does not affect performance.

  Further, as another aspect of the kiln repairing method according to the present invention, the kiln repairing method of a pyrolysis apparatus comprising a cylindrical kiln that pyrolyzes an object to be treated such as waste, the kiln An inner cylinder having an outer peripheral surface with a radius of curvature set based on the radius of curvature of the inner peripheral surface of the outer peripheral wall is fixed to the damaged portion of the outer peripheral wall by joining the outer peripheral peripheral portion to the inner peripheral surface of the kiln. It is characterized by doing. The curvature radius of the inner peripheral surface of the outer peripheral wall is set substantially equal to the curvature radius of the outer peripheral surface of the inner cylinder.

  According to the kiln repair method configured as described above, when the outer peripheral wall of the kiln is damaged, the damaged portion has an inner peripheral surface having a curvature radius substantially equal to the curvature radius of the inner peripheral surface of the outer peripheral wall. The cylinder is applied to the inner peripheral surface of the outer peripheral wall, and the outer peripheral peripheral edge is joined to the inner peripheral surface of the kiln to fix the inner cylinder to the kiln. Thereby, the damaged part of the kiln is covered with the inner cylinder from the inside to form a two-layer structure, and the damaged part can be easily repaired by covering the damaged part from the inside with an intact member.

  Furthermore, the kiln repair method according to the present invention is the above repair method, wherein the inner cylinder is fixed to the inner peripheral surface of the outer peripheral wall of the kiln, and then the outer peripheral wall of the kiln covered with the inner cylinder is It is characterized in that it is removed leaving the outer peripheral edge where the inner cylinder is joined. That is, the outer kiln outer peripheral wall covered with the inner cylinder is removed from the outside of the kiln leaving the joined outer peripheral edge, and the two-layer portion of the repaired portion is made into one layer. Thus, after covering with the inner cylinder, the damaged portion can be removed from the outside to be replaced with a new member having no damage and repaired. Thereby, the two-layer part by the repair of a kiln becomes one layer, and it can repair without affecting the function and performance of a kiln.

  It is preferable that the outer cylinder or the inner cylinder is divided along the axial direction and is sequentially fixed to the outer peripheral surface or inner peripheral surface of the outer peripheral wall of the kiln. And it is preferable that the divided | segmented outer cylinder or inner cylinder is finally joined mutually. In the kiln repair method configured in this way, when the outer cylinder or the inner cylinder is applied to the outer peripheral wall of the kiln, the divided pieces divided along the axial direction can be partially applied and fixed by joining, After joining and fixing one divided piece, another divided piece is joined and fixed adjacent to the fixed divided piece, and a plurality of divided pieces are joined and fixed to each other over the entire circumference of the outer peripheral wall of the kiln. Can be joined and fixed. For this reason, along the outer peripheral surface of the outer peripheral wall of the kiln, the outer cylinder that makes a round is moved in the axial direction and fitted, or the inner cylinder that makes a round along the inner peripheral surface of the outer peripheral wall of the kiln is made axial. Therefore, it is not necessary to move it to the inner position, and the repair work becomes easy.

  Furthermore, another aspect of the kiln repairing method according to the present invention includes a cylindrical kiln for thermally decomposing an object to be treated such as waste, and the inner peripheral surface of the outer peripheral wall is disposed on a damaged portion of the outer peripheral wall of the kiln. An inner cylinder having an outer peripheral surface with a curvature radius substantially equal to the curvature radius of the surface is fitted. According to this configuration, an inner cylinder having an outer peripheral surface with a radius of curvature substantially equal to the radius of curvature of the inner peripheral surface of the outer peripheral wall corresponding to the damaged part of the kiln is fitted, and fixing by welding or the like is not performed. It can be repaired very easily and the working time can be shortened.

  In the repair method, it is preferable that a thin metal plate is sandwiched between the inner cylinder and the inner peripheral surface of the outer peripheral wall of the kiln so that the inner cylinder and the inner peripheral surface of the outer peripheral wall of the kiln are in close contact with each other. . In particular, as the sandwiched metal thin plate, a metal thin plate having excellent ductility and malleability and excellent corrosion resistance such as gold and silver is preferable. According to this configuration, the close contact state between the outer peripheral wall of the kiln and the inner cylinder can be improved, and the heat transfer state of the outer peripheral wall of the kiln is improved, so that heating of the waste inside the kiln becomes uniform. Thermal decomposition can be performed efficiently.

  As another aspect, the kiln repair method according to the present invention is a repair method for the kiln of a thermal decomposition apparatus including a cylindrical kiln that thermally decomposes an object to be processed such as waste, and an outer peripheral wall of the kiln. It is characterized in that the damaged portion is cut out, and the abutment plate is joined and fixed to the cut portion. The plate may be fixed from the outside of the kiln or may be fixed from the inside. The plate is preferably made of the same material and the same thickness as the kiln.

  According to the kiln repair method configured as described above, the damaged portion of the kiln is cut into a predetermined shape, and by removing the kiln, for example, further damage such as corrosion is prevented, and the plate is applied to the cut portion. In addition, since it is fixed by welding or the like, repair work can be easily performed. Moreover, when the same material and the same thickness are joined, the thermal conductivity does not change, so that the function and performance of the kiln are not affected. This repair method is optimal when the damaged portion is small, and is a repair method that can reduce the time for repair work.

  According to the kiln repairing method of the present invention, in the thermal decomposition apparatus including a cylindrical kiln, the damaged portion of the outer peripheral wall is not affected by the function and performance of the cylindrical kiln and is healthy without defects. Since it can be covered with a member and can be replaced with a sound member having no defect, the kiln can be operated safely and stably. Furthermore, it is possible to extend the life of the thermal decomposition apparatus by repairing the cylindrical kiln.

  Hereinafter, a first embodiment of a kiln repair method according to the present invention will be described in detail with reference to the drawings. First, a thermal decomposition apparatus including a rotary kiln type gasification furnace will be described with reference to FIG. FIG. 1 is a cross-sectional view of a main part of a thermal decomposition apparatus including a rotary kiln type gasification furnace.

  In FIG. 1, a thermal decomposition apparatus 1 according to the present embodiment is an apparatus that thermally decomposes waste as an object to be processed, and is a rotary kiln type thermal decomposition apparatus that rotates a cylindrical rotary kiln. This pyrolysis apparatus 1 is an apparatus that separates garbage into pyrolysis residue containing pyrolysis gas and pyrolysis carbon (hereinafter referred to as char), and is used in a melting furnace (not shown) heated to high temperature by pyrolysis gas and char. By charging char and ash, ash is melted into slag.

  This type of gasification and melting furnace can control the generation of dioxins because it can treat waste at high temperature, and the final product slag can be effectively used for building materials, etc., greatly increasing the amount of landfill to the final disposal site. Can be reduced. Furthermore, since this gasification melting furnace covers these treatments with the energy possessed by the waste, it has a feature that it can greatly reduce the external energy required for the waste treatment.

  The thermal decomposition apparatus 1 which comprises a gasification melting furnace is comprised as an apparatus provided with the rotary 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 rotary kiln 3. Below the input hood 2, a screw feeder 4 for conveying the input waste is installed, and the waste is supplied into the rotary kiln 3 by this screw feeder. The rotary kiln 3 is supported at both ends by a bearing mechanism (not shown) and is rotated at a low speed by a rotation driving mechanism (not shown). The rotary kiln 3 is formed of a metal cylinder such as stainless steel, for example, and has a large-diameter outer peripheral wall 3a portion and a small-diameter inlet portion concentrically continuing to both ends of the outer peripheral wall via vertical wall portions. 3b and an outlet portion 3c, which are installed in a substantially horizontal state or slightly lowered toward the outlet side.

  A jacket 5 is surrounded as a combustion chamber on the outer periphery of the rotary kiln 3, and high-temperature exhaust gas from a pyrolysis gas burner (not shown) that burns pyrolysis gas generated in the rotary kiln 3 is heated in the jacket 5. The waste (garbage) supplied as the gas 6 and supplied into the kiln 3 is heated and thermally decomposed. The jacket 5 is fixed to the base of the thermal decomposition apparatus 1, and the rotary kiln 3 rotates around the inner periphery of the jacket 5 that is an apparatus fixing portion.

  In the thermal decomposition apparatus 1, the garbage brought into the incineration site is sent into the rotary kiln from the input hood 2 which is the inlet of the rotary kiln 3 placed horizontally by the screw feeder 4. Garbage in the rotary kiln 3 moves toward the discharge hood 7 that is an outlet while being stirred in the rotating rotary kiln 3, and is heated in an atmosphere in which air is interrupted during that time, so that mainly pyrolysis gas 8 and char 9 Are separated and transformed into a substance called ash 10 mainly composed of inorganic compounds. In this process, metal wastes such as iron and aluminum are treated below their melting points, and are recovered as incombustible materials in their original form.

  The heating gas 6 for heating the garbage is a temperature obtained by burning the pyrolysis gas 8 with a pyrolysis gas burner (not shown), and the path of the rotary kiln 3 and the jacket 5 is moved in the direction of the garbage. The rotary kiln 3 is heated by circulating in the forward or reverse direction. That is, heat is supplied to the waste through the rotary kiln 3, and pyrolysis gas 8 and char 9 are generated by pyrolysis.

  The pyrolysis gas generated in the rotary kiln 3 contains combustion gases such as carbon monoxide, hydrogen, and hydrocarbons, and contains harmful gases such as carbon monoxide and has an odor, so it leaks into the atmosphere. I can't let you. Further, the heating gas 6 obtained by burning the pyrolysis gas 8 with the pyrolysis gas burner also contains harmful gas, and therefore cannot be leaked from the jacket 5 to the atmosphere. Therefore, these gases leak into the atmosphere between the device fixing portion of the pyrolysis apparatus 1 that is the path of the pyrolysis gas 8 and the heating gas 6 and the rotary rotary kiln 3 that generates the pyrolysis gas. A sealing device for preventing this is necessary. Such a sealing device prevents the pyrolysis gas 8 and the heating gas 6 from leaking out of the system.

  These sealing devices require a sealing device 11 at a joint portion between the rotating kiln 3 and the jacket 5 as a fixed portion, and a sealing device 12 at a joint portion between the rotating rotary kiln 3 and the garbage input hood 2. Further, a sealing device 13 is also required between the discharge hood 7 and the kiln 3. These sealing devices 11 to 13 may basically have the same structure. As a sealing device used in the thermal decomposition apparatus 1, for example, a collar portion extending from a rotating rotary kiln 3 and a collar portion of a jacket 5 serving as a device fixing portion are pressed and slid by a spring or the like, and an internal gas is slid. In general, an example of preventing the leakage of the above is described.

  Since the inner wall of the rotary kiln 3 for thermally decomposing garbage comes into contact with the highly corrosive pyrolysis gas 8 containing chlorine compounds and sulfur compounds at a high temperature, corrosion damage due to overall corrosion or the like becomes obvious. Even when the thermal decomposition apparatus 1 is stopped, so-called acid dew point corrosion occurs if the corrosive components in the gas become below the dew point and liquefy. Therefore, in order to continue the operation | movement which ensured the safety | security and stability of the rotary kiln 3, it is necessary to stop the progress of such corrosion or to repair the damaged part.

  If the thickness of the rotary kiln 3 configured as described above is reduced due to corrosion or the like, it becomes a factor that hinders safe and stable operation. It is necessary to repair it promptly. Hereinafter, a first embodiment of the rotary kiln repair method of the present invention will be described with reference to FIGS.

  FIG. 2 shows a perspective view of a main part of the process of installing the divided outer cylinder on the outer surface of the rotary kiln. In FIG. 2, in this embodiment, an outer cylinder is used to cover the outer peripheral wall of the rotary kiln 3 so as to repair a damaged portion S (damaged part) generated on the inner surface or outer surface of the outer peripheral wall of the rotary kiln 3. A member divided into two in the axial direction (hereinafter referred to as divided cylinders 21 and 22) is installed on the outer surface of the rotary kiln. In the following, the case of the divided cylinders 21 and 22 in which the cylindrical outer cylinder is divided into two will be described.

  The outer cylinder 20 forms a cylindrical shape by joining the divided cylinders 21 and 22 along the axial end face, and both end faces are cut at right angles to the axial direction. The curvature radius of the inner peripheral surface of the outer cylinder 20 is set based on the curvature radius of the outer peripheral surface of the outer peripheral wall 3a of the rotary kiln 3, and the curvature radius R1 between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the rotary kiln is substantially equal. Are set equal. The material of the divided cylinders 21 and 22 constituting the outer cylinder 20 does not have to be the same as the material of the rotary kiln 3, but the length of the outer cylinder 20 installed in the rotary kiln does not cover the entire damaged portion S. must not. The wall thickness of the outer cylinder 20 is preferably equal to the wall thickness of the rotary kiln 3.

  FIG. 3 is a perspective view showing a main part of a process following the process of FIG. In the process of FIG. 3, both ends (peripheral peripheral edge portions) of the divided cylinder 21 installed on the outer peripheral wall 3a of the rotary kiln 3 in the process of FIG. 2 are welded and joined by fillet welding or the like to form the outer peripheral joint portions 23 and 23. Thus, the rotary kiln 3 is fixed to the outer peripheral wall 3a. As shown in FIG. 3, a part of the damaged portion S is covered with the divided cylinder 21. In the case of fixing by welding, there is a concern about deformation of the split cylinder 21 due to welding heat or welding residual stress. In this case, the strong cylindrical structure of the rotary kiln 3 restrains deformation of the outer cylinder 20. Such deformation does not occur.

  FIG. 4 is a perspective view showing a main part of a process following the process of FIG. In the process of FIG. 4, after one divided cylinder 21 is fixed to the outer peripheral wall 3 a of the rotary kiln 3, the rotary kiln 3 is rotated 180 ° and turned upside down to divide the outer cylinder 20 into two divided cylinders. A divided cylinder 22 that is a pair of divided cylinders 21 fixed to the outer peripheral wall 3 a of the rotary kiln 3 is installed. When the installation is completed, the axial end surfaces 22a and 22a of the divided cylinder 22 come into contact with the axial end surfaces 21a and 21a of the fixed divided cylinder 21.

  FIG. 5 is a main part perspective view showing a step that follows the step of FIG. In the process of FIG. 5, both ends (peripheral peripheral edge portions) of the divided cylinder 22 installed on the outer peripheral wall 3 a of the rotary kiln 3 in the process of FIG. 4 are welded and joined by fillet welding or the like to form the outer peripheral joint 24. Is fixed to the outer peripheral wall 3a of the rotary kiln 3. Further, the end surfaces 21a and 22a along the axes of the divided cylinders 21 and 22 are welded and joined to each other by fillet welding or the like to form the axially joined portion 25, whereby the outer cylinder 20 of the rotary kiln 3 is obtained. In addition, when the outer cylinder 20 is not divided, the axial joint portion is not necessary, and only the outer peripheral joint portion may be fixed. Thereby, the healthy outer cylinder 20 having no damage is fixed to the damaged part of the rotary kiln 3, and the damaged part S is entirely covered. In the kiln repairing method of the present invention, the temporary repair is completed in the steps so far, and the safe and stable operation of the rotary kiln 3 is possible. Further, the function of the rotary kiln is performed by performing the steps after FIG. And the effect on performance can be reduced.

  FIG. 6 is a cross-sectional view of the main part of the rotary kiln 3 in a state where the outer cylinder 20 is joined and fixed to the outer peripheral wall 3a of the rotary kiln 3 in the process of FIG. In the rotary kiln, the outer surface is heated by a heating gas, and the heat is transferred to the garbage in the rotary kiln for thermal decomposition. However, in FIG. 6, the rotary kiln 3 and the outer cylinder 20 have a double structure. If the contact between the two is insufficient, the efficiency of heat transfer to the waste may be hindered, resulting in an obstacle to thermal decomposition. Therefore, the two-layer structure of the outer cylinder 20 and the outer peripheral wall 3a of the rotary kiln 3 is changed to a one-layer structure in the process shown in FIG.

  FIG. 7 is a fragmentary cross-sectional view showing a step that follows the step of FIG. In the process of FIG. 7, a part of the outer peripheral wall 3 a of the rotary kiln 3 to which the outer cylinder 20 is fixed, that is, the outer peripheral wall portion of the rotary kiln 3 covered with the outer cylinder 20 is left leaving the outer peripheral edge portion to which the outer cylinder is joined. Then, the removal portion 3d including the damaged portion is removed. The width W1 that leaves the outer peripheral edge is preferably set to be substantially equal to the thickness of the outer peripheral wall 3a of the rotary kiln 3. For the removal, for example, it is preferable that a cut is made from the inner peripheral side of the rotary kiln and further divided and removed by a large number of vertical and horizontal cuts. As a result, heat is directly transferred from the outer cylinder heated by the heated gas to the garbage, and the heat transfer efficiency to the garbage is not hindered. That is, by performing the process of FIG. 7 in the first embodiment described above, the damaged portion of the rotary kiln 3 is not affected by the function and performance of the rotary kiln, that is, the garbage in the rotary kiln 3 from the heating gas 6. The amount of heat applied to the outer cylinder 20 can be made equivalent to that before the repair, and the repair can be performed by replacing the outer cylinder 20 made of a new member (sound member) without damage.

  Moreover, after removing the removal part 3d of the outer peripheral wall covered with the outer cylinder 20, the final joining process of the outer cylinder 20 and the peripheral part of the rotary kiln 3 is performed from the inner surface side of the rotary kiln 3, and fillet welding or the like is performed. By forming the inner peripheral joint portion 26, the structural reliability of the rotary kiln 3 and the outer cylinder 20 can be improved. That is, the outer peripheral edge of the outer cylinder 20 is welded and joined by the outer peripheral joints 23 and 24, and the peripheral part of the outer peripheral wall of the rotary kiln 3 is welded and joined by the inner peripheral joint 26. Strength increases and reliability improves.

  In the present embodiment, the outer cylinder is divided into two parts and each is fixed to the rotary kiln. However, if possible, the outer cylinder may be installed in the rotary kiln without being divided into cylinders. Conversely, after the divided cylinders divided into three or more parts are sequentially fixed to the rotary kiln, the divided cylinders may be joined to form an outer cylinder.

  Next, a second embodiment of the rotary kiln repair method of the present invention will be described with reference to FIGS. In the first embodiment described above, the outer cylinder is joined and fixed to the damaged portion of the outer peripheral wall of the rotary kiln. In this embodiment, the inner cylinder is attached to the inner periphery of the damaged portion of the outer peripheral wall of the rotary kiln. It is characterized by being bonded and fixed. FIG. 8 is a perspective view of essential parts and a sectional view of relevant parts in a state in which a cylindrical inner cylinder 30 is installed and fixed in the rotary kiln in order to repair a damaged portion generated on the inner surface or outer surface of the rotary kiln 3. FIG. 9 is a main part perspective view and a main part cross-sectional view of a state where the outer peripheral wall of the kiln covered with the inner cylinder is removed leaving the outer peripheral edge after the inner cylinder is fixed in the post-process of FIG. 8.

  8 and 9, the rotary kiln 3 has the same configuration as that of the above-described embodiment, is formed of a metal cylinder such as stainless steel, and has a large-diameter outer peripheral wall 3a portion. When the outer peripheral wall 3a of the rotary kiln 3 is damaged, the inner cylinder 30 is installed on the inner periphery of the damaged portion for repair. The curvature radius R2 of the outer peripheral surface of the inner cylinder 30 is set substantially equal to the curvature radius of the inner peripheral surface of the outer peripheral wall 3a of the rotary kiln 3. With this configuration, when the inner cylinder 30 is brought into contact with the inner periphery of the outer peripheral wall 3a, the inner cylinder 30 and the outer peripheral wall 3a are in contact with each other with almost no gap because they have substantially the same radius of curvature R2.

  Even in this embodiment, the material of the inner cylinder is not necessarily the same as the material of the rotary kiln, but is preferably the same in order to reduce the influence on the function and performance of the kiln. In addition, the length of the inner cylinder joined and fixed to the rotary kiln must cover all the damaged portions of the outer peripheral wall. Further, the inner cylinder 30 is preferably as thick as the rotary kiln 3.

  The inner cylinder 30 is inserted into the rotary kiln corresponding to the damaged portion of the outer wall 3a of the rotary kiln 3, and the peripheral portions at both ends of the inserted inner cylinder 30 are welded by fillet welding or the like, and the inner peripheral joint portions 31, 31 are inserted. Fix to the rotary kiln by forming In the case of fixing by welding, there is a concern about deformation of the inner cylinder due to welding heat or welding residual stress. In this case as well, the strong cylindrical structure of the rotary kiln 3 is deformed of the inner cylinder 30 as in the above-described embodiment. Therefore, such deformation does not occur.

  After fixing the inner cylinder 30 to the inner peripheral surface of the outer peripheral wall 3a of the rotary kiln 3 in this way, the outer peripheral wall of the kiln covered from the inner surface with the inner cylinder is left as the outer peripheral edge where the inner cylinder 30 is joined. To remove. FIG. 9 shows a state in which a part including a damaged portion of the rotary kiln 3 provided with the inner cylinder is removed as a removing portion 3e, and the inner cylinder 30 is directly heated by the heated gas. The width W2 that leaves the outer peripheral edge is preferably set to be substantially equal to the thickness of the outer peripheral wall 3a of the rotary kiln 3.

  As described in the first embodiment, if the rotary kiln 3 and the inner cylinder 30 have a double structure, if the contact between the rotary kiln 3 and the inner cylinder 30 is not sufficient, the heat transfer efficiency to the waste is hindered, resulting in an obstacle to thermal decomposition. There is. However, since the portion where the inner cylinder 30 is installed has a single-layer structure by removing the outer peripheral wall of the rotary kiln while leaving the joined outer peripheral edge portion, the heat transfer efficiency to the waste is not hindered. That is, also in the second embodiment, similarly to the first embodiment described above, the damaged part of the rotary kiln is replaced with an inner cylinder made of a healthy member without damage without affecting the function and performance of the rotary kiln. Can be repaired.

  Also in this embodiment, it is preferable that the peripheral edge portion removed from the outer peripheral wall 3 a is welded and joined by fillet welding or the like to form the outer peripheral joint portion 32. Thus, the outer peripheral wall 3 a of the rotary kiln 3 and the inner cylinder 30 are welded and joined by the inner peripheral joint portion 31, and the peripheral portion from which the removed portion 3 e of the outer peripheral wall of the rotary kiln 3 is removed is formed by the outer peripheral joint portion 32. Since it is welded and joined, the joint strength is increased and the structural reliability of the rotary kiln is improved. Although it is not necessary to form an outer periphery joining part, it is preferable to form on the intensity | strength of a rotary kiln.

  In the second embodiment, the inner cylinder is not divided and is inserted and fixed as it is in the rotary kiln 3. However, as in the first embodiment, the inner cylinder is joined and fixed to the damaged portion of the outer peripheral wall. Sometimes the inner cylinder is divided in the axial direction, and the divided cylinder is inserted into the kiln. After insertion, the cylinder is joined and fixed in the rotary kiln by welding or other methods, and then fixed to the entire inner circumference of the outer wall. You may comprise. For example, a circular inner cylinder is cut in the axial direction to form, for example, two or three divided cylinders, and one divided piece is bonded and fixed so as to cover the damaged portion, and then adjacent divided cylinders are bonded. After fixing the divided cylinder over the entire circumference, the inner cylinder may be fixed by joining together along the axial direction. This case is particularly suitable when it is difficult to insert a circular inner cylinder into the inner periphery of the kiln.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a cross-sectional view showing a repairing method of the rotary kiln according to the third embodiment and an enlarged view of a part A. In this embodiment, the damage to the outer peripheral wall of the rotary kiln is internally fitted with an inner cylinder having an outer peripheral surface having a curvature radius substantially equal to the curvature radius R3 of the inner peripheral surface of the outer peripheral wall, whereby the progress of damage to the rotary kiln is progressed. It is characterized by preventing. That is, only the inner cylinder 35 is fitted to the inner peripheral surface of the outer peripheral wall 3a of the rotary kiln 3 so as to be in close contact with the inner peripheral surface, and welding or the like is not performed. In the second embodiment described above, the inner cylinder is joined and fixed, and then the heated gas directly heats the inner cylinder by removing a part of the rotary kiln that fixes the inner cylinder. Even if the double cylinder structure of the inner cylinder and the inner cylinder can be used to transfer heat enough to thermally decompose the garbage, it is only necessary to fix the inner cylinder in the rotary kiln corresponding to the damaged portion.

  In the third embodiment, the inner cylinder 35 and the outer peripheral wall 3a of the rotary kiln 3 are sandwiched with a metal thin plate 36 having excellent ductility and malleability such as gold and having high thermal conductivity. It is preferable that the rotary kiln 3 is fitted in close contact with the inner peripheral surface of the outer peripheral wall. By fitting the outer peripheral wall 3a of the rotary kiln 3 and the inner cylinder 35 with the thin metal plate 36 interposed therebetween, heat transfer between the inner cylinder and the rotary kiln can be improved, and the heat transfer state to the dust even in the two-layer structure Can be made uniform. As described above, by ensuring sufficient heat transfer between the rotary kiln 3 and the inner cylinder 35, it is possible to prevent the thermal decomposition ability of the rotary kiln before and after the repair from being different.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a perspective view of an essential part of a fourth embodiment of the rotary kiln repairing method. This embodiment is applied when damage to the outer peripheral wall 3a of the rotary kiln 3 occurs in a limited small area. In FIG. 11, the damaged part of the rotary kiln 3 is excised, and the excavated part 40 is excised so that dust and pyrolysis gas do not leak out of the rotary kiln 3, and conversely, the heated gas does not leak into the rotary kiln. The hole 40 is closed with a contact plate 41 or the like. Although FIG. 11 shows the case where the contact plate 41 is joined and fixed to the outer peripheral wall of the rotary kiln 3 from the outer surface by means such as welding, the contact plate 41 may be joined and fixed from the inner surface of the rotary kiln 3.

  In the fourth embodiment of the present invention configured as described above, when the outer peripheral wall 3a of the rotary kiln 3 is damaged, the damaged portion is first cut out to prevent the damage from proceeding. The area to be excised is preferably set larger than the damaged part. And, since the cutting plate 41 having an area larger than the area of the excised part is applied from the outer peripheral side or the inner peripheral side of the rotary kiln 3 so as to close the hole 40 that has been excised and penetrated, the repaired part is small. It can be easily repaired with less work time. Thus, the fourth embodiment is an optimal repair method when the damaged portion of the outer peripheral wall 3a of the rotary kiln 3 has a small area.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, an example is shown in which the radius of curvature of the inner peripheral surface of the outer cylinder fixedly bonded to the outer peripheral wall of the kiln is substantially equal to the radius of curvature of the outer peripheral surface of the outer peripheral wall of the kiln. Needless to say, there may be some variation as long as the pyrolysis gas does not leak when it is fixed.

  As an application example of the present invention, this kiln repairing method can be used to repair cylindrical kilns other than rotary kilns, and can also be applied to kiln repairing of equipment that thermally decomposes objects other than waste. .

Sectional drawing which shows the principal part structure of a thermal decomposition apparatus provided with the rotary kiln of a gasification melting furnace. The principal part perspective view which shows the process of 1st Embodiment of the repair method of the rotary kiln which concerns on this invention, and installs the divided | segmented outer cylinder in the outer peripheral surface of the outer peripheral wall of a rotary kiln. The main part perspective view which shows the process following the process of FIG. 2 and fixes the divided | segmented outer cylinder to the outer surface of a rotary kiln by joining processes, such as welding. The principal part perspective view which shows the process following the process of FIG. 3 and installs the other divided | segmented outer cylinder in the outer peripheral surface of the outer peripheral wall of a rotary kiln. FIG. 4 shows a step subsequent to the step of FIG. 4, fixing other divided outer cylinders to the outer peripheral surface of the outer peripheral wall of the rotary kiln by a joining process such as welding, and further joining the divided outer cylinders by a joining process such as welding. The principal part perspective view made into the outer cylinder. The principal part sectional drawing of the rotary kiln of the state which fixed the outer cylinder at the process of FIG. FIG. 7 is a cross-sectional view of a main part showing a state where a part of the rotary kiln to which the outer cylinder is fixed is removed, showing a process following the process of FIG. The repair method of the rotary kiln of the 2nd Embodiment of this invention is shown, (a) is a principal part perspective view of the state which fixed the inner cylinder in the rotary kiln by joining processes, such as welding, (b) is (a). FIG. 8A and 8B show a step subsequent to the step of FIG. 8, wherein FIG. 8A is a perspective view of a main part in a state where a part of the outer peripheral wall of the rotary kiln covered with the inner cylinder is removed after fixing the inner cylinder; FIG. The repair method of the rotary kiln of the 3rd Embodiment of this invention is shown, (a) is principal part sectional drawing, (b) is an enlarged view of the A section of (a). The principal part perspective view of operation | movement description which plugs up the hole formed by excising a damage part with the repair method of the rotary kiln of the 4th Embodiment of this invention with an abutment board.

Explanation of symbols

1: Pyrolysis device, 2: Input hood, 3: Rotary kiln, 3a: Outer wall, 3d, 3e: Rotary kiln removal part, 4: Screw feeder, 5: Jacket, 6: Heated gas, 7: Exhaust hood, 8: Pyrolysis gas, 9: Char, 10: Ash, 11: Heated gas seal device, 12: Pyrolysis gas seal device, 20: Outer cylinder, 21, 22: Split cylinder, 23, 24: Outer joint (welded part) , 25: axial joint (welded part), 26: inner circumference joined part (welded part), 30: inner cylinder, 31: inner circumference joined part (welded part), 35: inner cylinder, 36: thin metal plate, 40 : Hole (excised part), 41: Contact plate, S: Damaged part, R1, R2, R3: Radius of curvature, W1, W2: Width to leave the outer peripheral edge

Claims (8)

A method for repairing the kiln of a thermal decomposition apparatus including a cylindrical kiln for thermally decomposing an object to be treated such as waste,
An outer cylinder having an inner peripheral surface with a radius of curvature set with reference to the radius of curvature of the outer peripheral surface of the outer peripheral wall is bonded to the damaged portion of the outer peripheral wall of the kiln, and the outer peripheral peripheral edge portion is joined to the outer peripheral surface of the kiln. A method of repairing a kiln characterized by fixing.   After fixing the outer cylinder to the outer peripheral surface of the outer peripheral wall of the kiln, the outer peripheral wall of the kiln covered with the outer cylinder is removed leaving the outer peripheral edge portion to which the outer cylinder is joined. The method for repairing a kiln according to claim 1. A method for repairing the kiln of a thermal decomposition apparatus including a cylindrical kiln for thermally decomposing an object to be treated such as waste,
An inner cylinder having an outer peripheral surface with a radius of curvature set based on the radius of curvature of the inner peripheral surface of the outer peripheral wall is bonded to the damaged portion of the outer peripheral wall of the kiln, and the outer peripheral peripheral edge portion is joined to the inner peripheral surface of the kiln. A kiln repair method characterized by fixing the   After the inner cylinder is fixed to the inner peripheral surface of the outer peripheral wall of the kiln, the outer peripheral wall of the kiln covered with the inner cylinder is removed leaving the outer peripheral edge where the inner cylinder is joined. The kiln repair method according to claim 3.   The said outer cylinder or an inner cylinder is divided | segmented along the axial direction, and is sequentially fixed to the outer peripheral surface or inner peripheral surface of the outer peripheral wall of the said kiln, The Claim 1 characterized by the above-mentioned. How to repair the kiln. A method for repairing the kiln of a thermal decomposition apparatus including a cylindrical kiln for thermally decomposing an object to be treated such as waste,
A kiln repairing method comprising: fitting an inner cylinder having an outer peripheral surface having a curvature radius substantially equal to a curvature radius of an inner peripheral surface of the outer peripheral wall into a damaged portion of the outer peripheral wall of the kiln.   The metal cylinder is sandwiched between the inner cylinder and the inner peripheral surface of the outer peripheral wall of the kiln, and the inner cylinder and the inner peripheral surface of the outer peripheral wall of the kiln are brought into close contact with each other. The kiln repair method described. A method for repairing the kiln of a thermal decomposition apparatus including a cylindrical kiln for thermally decomposing an object to be treated such as waste,
A repairing method for a kiln, characterized in that a damaged portion of an outer peripheral wall of the kiln is excised, and a contact plate is joined and fixed to the excised portion.

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