JPH0861641A - Plasma melting furnace for refuse incineration ash - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a plasma melting furnace for refuse incineration ash that can easily and safely perform maintenance work on a plasma torch. [Structure] A torch support 10 having a torch insertion hole 9 communicating with the torch insertion hole 7 is provided on a furnace lid 4, and a torch support 14 is pivotally supported at its lower end side on the torch support so that the torch support 14 can be turned over. The plasma torch can be pulled out from the furnace lid and turned sideways by erected and provided on the torch support column with an elevating table 18 capable of holding the plasma torch 5 by means of an elevating mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma melting furnace for refuse incineration ash that melts and treats refuse incineration ash such as municipal waste,
In particular, the present invention relates to a plasma incinerator for refuse incineration ash having improved plasma torch holding means.

[0002]

2. Description of the Related Art Conventionally, a plasma melting furnace for refuse incineration ash of this type has a furnace bottom electrode on the furnace bottom of a furnace body and a furnace lid as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-122109. A plasma torch is inserted into the provided torch insertion hole, and the plasma torch is provided so as to be able to approach and separate from the furnace bottom electrode by a torch lifting device provided on the furnace lid.

[0003]

However, in the conventional plasma melting furnace for refuse incineration ash, when inspecting or replacing parts such as the rear electrode, vortex generator, gap insulator, collimator, etc. in the torch, the plasma torch is used. The work must be performed in a substantially vertical state when it is pulled out from the furnace lid, which makes maintenance work difficult and dangerous. Further, since the plasma torch only moves up and down linearly, there is a problem that the degree of freedom of the plasma torch is low depending on the progress of melting of the refuse incineration ash and the furnace conditions. Therefore, it is a first object of the present invention to provide a plasma melting furnace for refuse incineration ash that enables maintenance work of the plasma torch to be performed easily and safely. A second object is to provide a plasma melting furnace for refuse incineration ash, which can increase the degree of freedom of the plasma torch.

[0004]

In order to solve the above-mentioned problems, the first refuse incineration ash plasma melting furnace of the present invention has a torch support in which a torch insertion hole communicating with the torch insertion hole is provided on the furnace lid. A stand is provided, and the torch support is erected on the torch support so that the torch support is pivotally supported at the lower end side of the torch support. And The second refuse incineration ash plasma melting furnace is characterized in that, in the first one, the torch support is supported by a trunnion and is tiltable. It is preferable that the torch support base is provided with a heat shield lid that can hermetically close the torch insertion hole.

[0005]

In the plasma melting furnace for the first refuse incineration ash according to the present invention, the plasma torch can be extracted from the furnace lid and laid over. In addition, in the second plasma incinerator for refuse incineration ash, the degree of freedom of the plasma torch is 2 in addition to the function of the first one. On the other hand, by providing the heat shield lid that can close the torch insertion hole, the torch insertion hole can be shielded during maintenance.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a plan view and a front sectional view showing an embodiment of a plasma melting furnace for refuse incineration ash according to the present invention. In the figure, reference numeral 1 denotes a circular furnace body, and one furnace bottom electrode is vertically inserted in the center of a furnace bottom 2 of the furnace body 1, and a furnace lid 4
A plasma torch 5 is installed at the center of the furnace bottom electrode 3
It is provided so as to be airtightly opposed to, and can be raised and lowered via a torch raising / lowering device 6 provided on the furnace lid 4. That is, as shown in FIGS. 3 to 7, a torch insertion hole 7 is provided in the center of the furnace lid 4, while a rectangular lifting device surrounding the torch insertion hole 7 is mounted on the furnace lid 4. The tube 8 is electrically insulated from the furnace lid 4 and is erected in an airtight manner.
A torch support base 10 provided with a torch insertion hole 9 through which the plasma torch 5 is inserted is provided in the lifting device attachment cylinder 8, and a lower journal portion 10a having a columnar shape with a cutout portion provided at a symmetrical position on the peripheral surface. The required angle (for example, ± 10 ° with respect to the vertical line) by being pivotally supported by the trunnion 11.
It is provided so that it can be tilted. The torch support base 10 constitutes a part of the torch lifting device 6, and its journal portion 10a is airtight to the lifting device mounting cylinder 8 via the packing 12 in order to maintain the airtightness of the furnace. An insulative gland packing 13 is provided on the inner peripheral surface of the torch insertion hole 9 so that the plasma torch 5 is airtightly inserted.

On the torch support 10, the torch support 14
By connecting the clevis 15 on the lower end side and the bracket 16 on the torch support base 10 with a pin 17, the clevis 15 is erected so as to be able to roll laterally in a direction perpendicular to the tilting direction about the trunnion 11. An elevating table 18 is mounted on the torch column 14, and a ball screw 19 and a ball screw 1 screwed into the table 18 are installed.
It is provided so as to be able to move up and down by an elevating mechanism including a motor 20 that rotates 9 and a guide 21. A band 22 that holds the plasma torch 5 in an electrically insulated manner from the lift 18 is attached to the lift 18. or,
The torch support 10 is provided with a heat shield lid 23 that can hermetically close the torch insertion hole 9 when the plasma torch 5 is pulled out from the torch insertion hole 9. That is,
A swivel plate 25 supported by a vertical shaft 24 is swivelably provided on the torch support 10 via an air cylinder 26. On the swivel plate 25, a swing lever 27 is provided with a horizontal pin. 28 and is swingably provided. The swing lever 27 is swingably provided by a thin air cylinder 30 interposed between one end of the swing lever 27 and a bracket 29 provided upright on the swivel plate 25, while the other end thereof has the heat The shield lid 23 is pivotally attached so as to be swingable. Therefore, by appropriately operating the air cylinder 26 and the thin air cylinder 30, it is possible to hermetically close the torch insertion hole 9 by the heat shield lid 23.

As shown in FIGS. 1 and 2, at a required position of the furnace lid (side wall) 31 of the furnace body 1, there is provided a slag port 33 having an exhaust gas port 32 in the upper part thereof. A flue passage 34 that guides upward the exhaust gas discharged by suction by a blower (not shown) is connected to the air passage 32 in an airtight manner. On the other hand, the outlet port 33 is connected to a duct-shaped gutter 35 that guides the melt 36 and the like to a water tank (not shown). At the required symmetrical position with the center line being a line passing through the center of the outlet port 33 and the furnace body 1 on the furnace wall facing the outlet port 33,
An ash charging port 37 is provided. The positions of the both ash input ports 37 are 60 to 60 ° between the line segments connecting the ash input ports 37 and the plasma torch 5 (hereinafter referred to as “the angle formed by the line segments”).
It is in the range of 90 °. Furnace wall 3 corresponding to both ash inlets 37
Outside of 1, the waste incineration ash 38 from each ash input port 37 is passed through substantially the middle of the plasma torch 5 and the furnace wall 31 in the direction orthogonal to the above center line (vertical direction in FIG. 1) and the outlet port 33. An ash throwing device 39 is provided for alternately and horizontally pushing in the direction of pointing. Double ash feeding device 39
When the angle of the line segment is 60 °, the direction in which the refuse incineration ash 38 is pushed in is 5 to 15 ° with respect to the center line, and when the angle of the line segment is 90 °, the center line is Is a direction that makes an angle of 30 ° with respect to. Each ash feeding device 39
Is a hopper 40 for temporarily storing the refuse incineration ash 38, a vertical partition chamber 41 connected to the lower part of the hopper 40, the upper and lower parts of the partition chamber 41 are airtightly partitioned, and opened and closed by air cylinders 42 and 43. Upper and lower dampers 44, 45
And a horizontal extrusion chamber 46 whose one end and the other end are airtightly connected to the ash input port 37 at the lower part of the partition chamber 41, and a hydraulic cylinder which is installed in the extrusion chamber 46 and pushes the refuse incineration ash 38 into the furnace It is composed of a push plate 48 which is initially fast by 47 and is slowly moved back and forth from the middle, and a shutter 50 which airtightly partitions the furnace body 1 side in the extrusion chamber 46 and is opened and closed by an air cylinder 49. There is.

In FIG. 2, reference numeral 51 indicates the molten metal contained in the melt 36 by tilting the furnace body 1 whose slag port 33 side is pivotally supported by the furnace legs 52 so that the slag port 33 side is lowered. It is a furnace tilting device for discharging (not shown).
Reference numeral 53 is a return ash discharging device provided in the lower portion of the extrusion chamber 46. Further, reference numeral 54 in FIG. 3 is a torch tilting metal fitting for tilting the plasma torch 5 together with the torch support 10 and the torch support pillar 14, and 55 in FIG. 4 is a torch steadying member for preventing the swinging of the torch support pillar 14. is there.

The melting treatment of the refuse incineration ash 38 in the plasma incinerator of the refuse incineration ash having the above-mentioned structure is performed by each ash feeding device 39.
The waste incineration ash 38 charged into the furnace by the furnace is melted by the plasma flame generated between the plasma torch 5 and the furnace bottom electrode 3, and the melted material 36 and the like is discharged from the outlet 33 to the furnace. The exhaust gas is discharged to the outside, and the exhaust gas is discharged to the flue 34.
Similarly, it is discharged to the outside of the furnace. In the plasma melting furnace, when performing maintenance of the plasma torch 5, the plasma torch 5 is pulled out from the torch insertion hole 9 by the torch lifting device 6, and the torch insertion hole 9 is airtightly closed by the heat shield lid 23, The plasma torch 5 is turned over together with the torch support 14, and the rear electrode, vortex generator, gap insulator, collimator, etc. in the torch are inspected and replaced. Therefore, the maintenance work of the plasma torch can be performed easily and safely, and the atmosphere in the furnace can be maintained well. In addition, when the refuse incineration ash 38 charged into the furnace is unevenly distributed on the melt 36 during the melting process in the plasma melting furnace, the plasma torch 5 is combined with the torch support post 14 and the torch support 10. Then, the trunnion 11 is appropriately tilted. Therefore, the plasma torch 5 has two degrees of freedom, and the refuse incineration ash 38 can be melt-processed in an optimum state.

In the above embodiment, the plasma melting furnace in which the furnace bottom electrode and the plasma torch are provided one by one has been described. However, the invention is not limited to this, and the furnace bottom electrode and the plasma torch facing the furnace bottom electrode are not limited thereto. The present invention is also applied to one provided with two or more pieces, one provided with a furnace bottom electrode having a smaller number of plasma torches, or one provided with two or more graphite electrodes without a furnace bottom electrode. be able to. When two or more plasma torches or graphite electrodes are provided, the direction of pushing in the refuse incineration ash by the ash throwing device is the direction toward the outlet through almost the middle of the adjacent plasma torches or graphite electrodes and the outermost plasma. The direction is toward the outlet through almost the middle of the torch or graphite electrode and the furnace lid. Further, the incineration of the refuse incineration ash is not limited to the case of being carried out horizontally, but may be carried out by inclining it so that the furnace body side becomes lower.

[0012]

As described above, according to the first refuse incineration ash plasma melting furnace of the present invention, the plasma torch can be pulled out from the furnace lid and overturned. Therefore, maintenance work of the plasma torch is possible. Can be done easily and safely. Moreover, according to the second refuse incineration ash plasma melting furnace, in addition to the function and effect of the first one, the degree of freedom of the plasma torch is 2. Therefore, the melting process can be optimized according to the situation of the refuse incineration ash. Can be done at. On the other hand, by providing a heat shield lid that can close the torch insertion hole, it is possible to shield the torch insertion hole during maintenance, so that maintenance work can be performed more safely and the atmosphere inside the furnace is maintained well. can do.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a plasma melting furnace for refuse incineration ash according to the present invention.

FIG. 2 is a front sectional view of the plasma melting furnace of FIG.

FIG. 3 is a front view of a plasma torch insertion portion in the plasma melting furnace of FIG.

FIG. 4 is a side view of the plasma torch insertion portion of FIG.

5 is a sectional view taken along line VV in FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

[Explanation of reference symbols] 4 furnace lid 5 plasma torch 7 torch insertion hole 8 lifting device mounting cylinder 9 torch insertion hole 10 torch support base 10a journal part 11 trunnion 14 torch support post 15 clevis 16 bracket 17 pin 18 lifting base 19 ball screw 20 motor 21 guide 23 heat shield lid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Hara 2-4-1 Hamamatsucho, Minato-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Head Office (72) Yoshito Matsuoka 1-chome, Higashikawasakicho, Chuo-ku, Kobe No. 3 Kawasaki Heavy Industries, Ltd. Kobe Main Office (72) Inventor Akihiko Hayashi 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. Tokyo Main Office (72) Kenji Nakano 2 Uchisaiwaicho, Chiyoda-ku, Tokyo 2nd-3rd Kawasaki Steel Co., Ltd. Tokyo Head Office (72) Inventor Kenri Yamazaki 2-30-30 Kandajinbocho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Inc. Research & Development Laboratory (72) Inventor Nobuyasu Shimoyama Tokyo 2-30, Kanda-Jinbocho, Chiyoda-ku, Tokyo Electric Power Co., Inc.

Claims (3)

[Claims] 1. A torch support having a torch insertion hole communicating with the torch insertion hole is provided on the furnace lid, and the torch support is erected so as to be able to roll over with its lower end side pivotally supported. , A plasma melting furnace for refuse incineration ash, characterized in that an elevating platform capable of holding a plasma torch is provided on a torch column so that it can be raised and lowered by an elevating mechanism. 2. The plasma melting furnace for refuse incineration ash according to claim 1, wherein the torch support is supported by a trunnion and is tiltable. 3. The plasma melting furnace for refuse incineration ash according to claim 1 or 2, wherein the torch support is provided with a heat shield lid capable of airtightly closing the torch insertion hole.