JP4288839B2 - Pyrolysis kiln external heat gas seal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an external heat gas sealing apparatus for a pyrolysis kiln in which waste such as municipal waste is indirectly heated by an external heat gas for pyrolysis gasification.
[0002]
[Prior art]
The indirect heating type pyrolysis kiln used in the gasification and melting plant for pyrolyzing waste gas is in the longitudinal direction of the outer cylinder 1 that is horizontally long, as schematically shown in FIG. Each end in the front-rear direction (arrow X direction) is supported by the inlet cylinder 1a and the outlet cylinder 1b fixedly arranged so as to be rotationally driven via the rotary joint 3, and the outer cylinder 1 is supported more than the inlet cylinder 1a side. The outlet cylinder 1b side is arranged so as to be lowered by about 3 degrees, and the inner cylinder 2 is concentrically formed in the outer cylinder 1 so that a heating channel 4 is formed between the outer cylinder 1 and the outlet cylinder 1b. The outer cylinder 1 and the inner cylinder 2 constitute a kiln body I having a double cylinder structure, and further, the supply pipe 5 and the discharge pipe 6 having both ends of the inner cylinder 2 smaller in diameter than the inner cylinder 2. The supply pipe 5 is located in the inlet cylinder 1a and the discharge pipe 6 is located in the outlet cylinder 1b. Then, the external hot gas 10 at 550 ° C. introduced from the external hot gas inlet 4a into the outlet cylinder 1b passes through the heating flow path 4 and flows out from the external hot gas outlet 4b of the inlet cylinder 1a, and the kiln main body I is slowed down. In the state rotated in the state, the waste 9 thrown into the charging hopper 7 is gradually supplied into the inner cylinder 2 through the supply pipe 5 of the inlet cylinder 1a by the dust feeder 8, and the inner and outer cylinders of the kiln main body I are supplied. Heating the waste 9 in the inner cylinder 2 by circulating an externally heated gas (heating gas) 10 from the outlet cylinder 1b side to the inlet cylinder 1a side in the heating channel 4 formed therebetween, The pyrolyzed gas 9a is dried and pyrolyzed, and the generated pyrolysis gas 9a is transferred to the separation chamber 11 through the discharge pipe 6 of the outlet tube 1b, and then taken out from the upper part and sent directly to the downstream combustion / melting furnace. The pyrolysis residue 9b containing metals passes through the discharge pipe 6. After transfer to the separation chamber 11, it is to be sent from through the fractionation step of the metals removed from the lower to the combustion and melting processes. Reference numeral 12 denotes a ring-shaped seal plate attached to the supply pipe 5 and the discharge pipe 6.
[0003]
However, in the case of the above pyrolysis kiln, since it is an indirect heating method and the heat transfer efficiency is poor, it is necessary to secure a sufficient contact area with the waste 9 and, therefore, there is a problem that the kiln body I becomes long. is there. Furthermore, since the kiln main body I becomes long, a large installation area is required, and there is a problem that greatly affects land use.
[0004]
For this reason, a multi-cylinder pyrolysis kiln has been proposed as an apparatus capable of increasing the amount of processing without making the kiln body I relatively long. In this multi-cylinder pyrolysis kiln, as shown schematically in FIG. 4 (a), (b), and (c), an outer cylinder 1 that has a refractory material 14 lined up horizontally is provided from the inlet cylinder 1a side. Also, the inner tube 13a and the outer tube 13b are arranged in a concentric manner with a predetermined gap so that the outlet tube 1b is inclined at about 3 degrees, and the inner tube A plurality (three in the figure) of inner cylinders 13 in which the external heat gas 10 is circulated through the heating flow path 18 formed between 13a and the outer pipe 13b are accommodated in the outer cylinder 1 in a parallel state. Thus, the kiln main body I is constituted, and both ends of the inner pipe 13a of each inner cylinder 13 are gathered and connected to one supply pipe 16 and a discharge pipe 17 having the same diameter as the inner pipe 13a. The supply pipe 16 is positioned in the inlet cylinder 1a, and the discharge pipe 17 is positioned in the outlet cylinder 1b. An external heat gas inlet provided on the outlet cylinder 1b side of the outer cylinder 1 as a structure in which the ends of the outer pipes 13b constituting the inner cylinders 13 are closed by the closing plate 15 on the discharge pipe 17 side. The external heat gas 10 introduced from 18a is regulated by the closing plate 15 to flow through the heating flow path 18 of each inner cylinder 13 and flow out from the external heat gas outlet 18b of the inlet cylinder 1a. When the waste 9 supplied into the inner tube 13a of the inner cylinder 13 is indirectly heated, dried and thermally decomposed, it is transferred to the separation chamber 11 through the discharge tube 17, and then the pyrolysis residue 9b is taken out downward. is there.
[0005]
In the multi-cylinder pyrolysis kiln, the inner cylinder 13 is thermally expanded by the circulation of the external heat gas 10 during operation, and a difference in thermal expansion occurs between the outer cylinder 1 and the inner cylinder 13 is The outer cylinder 1 is supported by a support metal 19 that can be displaced in the radial direction, and a gap is provided between the inner cylinder 13 and the outer cylinder 1 when cold. However, since this gap is large, the outer periphery of the collecting portion 17a of the discharge pipe 17 is disposed at the outer peripheral end of the closing plate 15 located on the discharge pipe 17 side in order to prevent the external heat gas 10 from flowing around to the outside of the inner cylinder 13. A sleeve tube 20 is connected so that a gap S is formed between the outer tube 1 and the lining refractory material 14 of the outer cylinder 1, and the sleeve tube 20 is thermally expanded along with the thermal expansion of the inner tube 13. In addition, a structure is adopted in which several pieces of ceramic rope 21 are packed in the gap S as a sealing member and are clamped by a presser fitting 22.
[0006]
[Problems to be solved by the invention]
However, the ceramic rope 21 employed as the sealing member has heat resistance but does not have elasticity to absorb a large difference in thermal expansion, so it is initially attached to the outer periphery of the sleeve tube 20 without a gap. Even if it is possible, once it is thermally expanded and compressed, it will not be restored, and a gap will be formed between the sleeve tube 20 and the outer cylinder 1, and the external heat gas 10 will pass through. The ceramic rope 21 is attached to the slack in anticipation of thermal expansion displacement of the sleeve tube 20, but is large between the outer tube 1 (refractory material 14) and the presser fitting 22 when cold. Since there is a gap, the sleeve tube 20 may be blown away by the wind pressure of the external heat gas 10 before the sleeve tube 20 is thermally expanded and the gap becomes small.
[0007]
Therefore, the present invention intends to provide an external heat sealing device for a pyrolysis kiln that can smoothly absorb the difference in thermal expansion between the sleeve tube and the outer cylinder and that the sealing member is not blown away by wind pressure. Is.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a double-tube structure with an inner tube and an outer tube in an outer tube that is disposed laterally with both ends in the longitudinal direction supported rotatably by an inlet tube and an outlet tube. A plurality of inner cylinders are stored in parallel and fixed, and both ends of the inner pipes of the inner cylinders are assembled and connected to the supply pipe and the discharge pipe arranged in the inlet cylinder and the outlet cylinder. The heating between the ends of the outer tubes of each inner cylinder is closed with a closing plate, and the waste material supplied into the inner tubes of each inner cylinder through the supply pipe is formed between the inner tube and the outer tube of the inner cylinder. At the outer peripheral end of the closing plate located on the discharge pipe side of the pyrolysis kiln that is pyrolyzed and gasified by circulating external heat gas from the outlet tube side to the flow path, on the outer periphery of the collection section of the discharge pipe A sleeve tube arranged so that a gap is formed between the sleeve and the outer tube; and The gap between the cylinder, a structure equipped with a seal member comprising a heat-sealing substrates so as to wrap spiral ring spring and the spiral ring spring.
[0009]
When the sleeve tube is thermally expanded along with the thermal expansion of the inner cylinder, the seal member can absorb the difference in thermal expansion due to the elastic deformation of the spiral ring spring, so that no gap is formed, and the sleeve tube has no outer periphery. On the other hand, since the sealing member exhibits a tightening force from the beginning, it is not blown away by wind pressure.
[0010]
In addition, by selecting a material that takes heat resistance only into consideration, by forming an extension allowance on the heat-resistant seal base material of the seal member and making the extension allowance to face sideways. Can do.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIGS. 1 (a), (b) and FIG. 2 show an embodiment of the present invention. In the same configuration as the multi-cylinder pyrolysis kiln shown in FIGS. 4 (a), (b) and (c). Instead of using the ceramic rope 21 as a sealing member for the gap S between the sleeve tube 20 and the lining refractory material 14 of the outer cylinder 1, a strip of steel or SUS is bent into a spiral and required. A sealing member 25 including a spiral ring spring 23 formed in a cylindrical shape and a heat-resistant sealing base material 24 used so as to wrap the spiral ring spring 23 is used as the lining refractory material 14 of the sleeve tube 20 and the outer cylinder 1. It is attached so as to be sandwiched in the gap S when it is cold, and the presser fitting 22 suppresses the movement of the sleeve tube 20 in the axial direction.
[0013]
The heat-resistant sealing substrate 24 employs an elongated asbestos or rock wool sheet, and the spiral ring 23 is wrapped in a C-shape with the sheet-shaped heat-resistant sealing substrate 24, so that the peripheral side surface portion A radial slit 24a is formed in a ring slit shape.
[0014]
Because of the above configuration, when the seal member 25 is sandwiched so as to be in close contact with the gap S between the sleeve tube 20 and the lining refractory material 14 of the outer cylinder 1 as shown in FIG. Even if the sleeve tube 20 thermally expands due to the thermal expansion of the inner cylinder 13 during operation and a difference in thermal expansion occurs between the outer cylinder 1 side and the outer cylinder 1 side, the sealing member 25 is spiral as shown in FIG. The ring spring 23 is elastically deformed by the compressive force, so that the thermal expansion difference (change in the gap S) can be absorbed, the sealing performance against the external heat gas 10 can be maintained, and the cold state can be maintained. Even in the case of returning, the spiral ring spring 23 is restored to its original shape by the elastic force, so that the sealing performance can be maintained. The seal base 24 surrounding the spiral ring spring 23 is formed with a radial extending margin 24a on the peripheral side surface portion, so that it can be displaced following the elastic deformation of the spiral ring spring.
[0015]
In addition, in the above, the spiral ring spring 23 of the seal member 25 has elasticity not only in the radial direction but also in the circumferential direction. Therefore, the seal member 25 is generally excellent in flexibility as compared with the conventional ceramic rope 21. Therefore, since the tightening force for the sleeve tube 20 is also obtained, it is not blown away even if it receives wind pressure. Furthermore, since the radial extension 24a as described above is formed in the sealing base 24, it can follow the elastic deformation of the spiral ring spring, so that only heat resistance such as asbestos and rock wool is considered. The material can be selected.
[0016]
As a method of wrapping the spiral ring spring 23 with the heat-resistant seal base material 24, the belt-shaped heat-resistant seal base material 24 is wound loosely around the spiral ring spring 23 so that an extension margin 24a is formed. The heat-resistant sealing substrate 24 may be partly divided and wound, or the heat-resistant sealing substrate 24 may be a ceramic fiber processed into a ring shape with elasticity, and processed into this ring shape. The sealing member 25 may be configured by forming a ring-shaped groove on the ceramic fiber from the side and enclosing the spiral ring spring 23 in the groove. Of course, various changes can be made without departing from the scope of the invention.
[0017]
【The invention's effect】
As described above, according to the external heat gas seal device of the pyrolysis kiln of the present invention, the inner pipe and the inner pipe are disposed in the outer cylinder that is horizontally arranged with both ends in the longitudinal direction being rotatably supported by the inlet cylinder and the outlet cylinder. A plurality of inner cylinders having a double-pipe structure are arranged and stored in parallel by an outer pipe, and both ends of the inner pipes of the inner cylinders are arranged in the inlet cylinder and the outlet cylinder, and discharged. Collecting and connecting the tubes together, connecting the ends of the outer pipes of the inner cylinders with a closing plate, and supplying the waste supplied into the inner pipes of the inner cylinders through the supply pipes with the inner pipes of the inner cylinders At the outer peripheral end of the closing plate located on the discharge pipe side of the pyrolysis kiln which is pyrolyzed and gasified by circulating external heat gas from the outlet cylinder side through the heating channel formed between the outer pipe and the outer pipe The sleeve is located on the outer periphery of the collecting portion of the discharge pipe so as to form a gap with the outer cylinder And a sealing member comprising a spiral ring spring and a heat-resistant sealing base material that wraps the spiral ring spring is mounted in a gap between the sleeve tube and the outer cylinder. Even if the sleeve tube is thermally expanded due to thermal expansion, the difference in thermal expansion between the sleeve tube and the outer cylinder can be absorbed by the elasticity of the spiral ring spring of the seal member, so that the gap between the sleeve tube and the outer cylinder can always be maintained. It is possible to maintain the sealing performance against the external heat gas, and the sealing member is flexible not only in the radial direction but also in the circumferential direction. Attaching force is obtained, and it is not blown away by wind pressure. Further, an extension allowance is formed on the heat-resistant sealing substrate, and the extension allowance is directed sideways. The heat-resistant sealing base material can easily follow the deformation of the spiral ring spring, and the heat-resistant sealing base material can be advantageous because it is possible to select a material considering only heat resistance. Demonstrate.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows an embodiment of an external heat gas seal device for a pyrolysis kiln of the present invention, in which (a) is a partial view showing a cold state, and (b) is a hot state. FIG.
FIG. 2 is a schematic view of a seal member used in the apparatus shown in FIG.
FIG. 3 is a schematic view showing an example of an indirect heating type pyrolysis kiln.
FIG. 4 shows an example of a multi-cylinder pyrolysis kiln, where (A) is a schematic cut side view, (B) is a view taken in the direction of arrows AA in (A), and (C) is an external heat gas seal. FIG. 3 is an enlarged view of a portion B in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer cylinder 1a Inlet cylinder 1b Outlet cylinder 9 Waste 10 Outer heat gas 13 Inner cylinder 13a Inner pipe 13b Outer pipe 15 Blocking plate 16 Supply pipe 17 Discharge pipe 17a Collecting part 18 Heating flow path 20 Sleeve pipe 23 Spiral ring spring 24 Heat resistance Seal base material 24a Extension allowance 25 Seal member

Claims (2)

A plurality of inner cylinders having a double-tube structure are arranged in parallel in an outer cylinder that is supported by the inlet cylinder and the outlet cylinder so as to be rotationally driven at both ends in the longitudinal direction. The inner tube of each inner cylinder is fixed and connected to the supply pipe and the discharge pipe arranged in the inlet cylinder and the outlet cylinder to communicate with each other, and between the ends of the outer pipes of the inner cylinders. The waste heat supplied to the inner pipe of each inner cylinder through the supply pipe is circulated from the outlet cylinder side to the heating channel formed between the inner pipe and the outer pipe of the inner cylinder. A gap is formed between the outer tube and the outer peripheral edge of the collecting portion of the discharge pipe at the outer peripheral end of the closing plate located on the discharge pipe side of the pyrolysis kiln that is to be pyrolyzed and gasified The sleeve ring arranged so as to be connected to the spiral ring in the gap between the sleeve pipe and the outer cylinder. Pulling the external heat gas seal device pyrolysis kiln, characterized in that it comprises a structure fitted with a sealing member comprising a heat-sealing substrates so as to wrap the spiral ring spring. 2. An external heat gas sealing device for a pyrolysis kiln according to claim 1, wherein an extension margin is formed on the heat-resistant sealing base material of the seal member, and the extension margin is directed sideways.

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