JP2795811B2 - Plasma melting furnace for incineration ash - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse incineration ash plasma melting furnace for melting municipal refuse incineration ash.
In particular, the present invention relates to a plasma melting furnace for refuse incineration ash with improved means for holding a plasma torch.

[0002]

2. Description of the Related Art Conventionally, this type of refuse incineration ash plasma melting furnace has a furnace bottom electrode provided on a furnace bottom and a furnace lid provided on a furnace lid as described in, for example, JP-A-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 elevating device provided on the furnace lid.

[0003]

However, in a conventional refuse incineration ash plasma melting furnace, when inspecting or replacing parts such as a rear electrode, a vortex generator, a gap insulator, and a collimator in a torch, a plasma torch is used. Work must be performed in a substantially vertical state pulled out of the furnace lid, making 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 incineration ash and the furnace condition. Accordingly, a first object of the present invention is to provide a plasma melting furnace for refuse incineration ash that can easily and safely perform maintenance work on a plasma torch. A second object is to provide a plasma melting furnace for refuse incineration ash that can increase the degree of freedom of a plasma torch.

[0004]

In order to solve the above-mentioned problems, a first refuse incineration ash plasma melting furnace of the present invention has a torch support provided with a torch insertion hole communicating with a torch insertion hole on a furnace lid. A torch support is provided on the torch support, and a torch support is pivotally supported at its lower end side so that the torch can be rolled over. And Further, the second refuse incineration ash plasma melting furnace is characterized in that, in the first refuse incineration ash, the torch support is supported by a trunnion and tiltably provided. It is preferable that the torch support is provided with a heat shielding lid that enables the torch insertion hole to be closed in an airtight manner.

[0005]

In the first plasma melting furnace for incineration ash of the present invention, the plasma torch can be pulled out from the furnace lid and rolled over. Further, in the second refuse incineration ash plasma melting furnace, the degree of freedom of the plasma torch becomes 2 in addition to the action of the first refuse incineration ash. On the other hand, by providing the heat shielding 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 incineration ash of the present invention. In the figure, reference numeral 1 denotes a furnace body having a circular shape. 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 is provided.
One plasma torch 5 is provided at the center of the furnace bottom electrode 3.
, And is provided so as to be able to move up and down via a torch elevating 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 airtightly erected.
A torch support 10 provided with a torch insertion hole 9 through which the plasma torch 5 is inserted is attached to the elevating device mounting cylinder 8, and a cylindrical lower journal portion 10a having a cut-out portion provided at a symmetrical position on the peripheral surface. By being pivotally supported by the trunnion 11, the required angle (eg, ± 10 ° with respect to the vertical)
And can be tilted. The torch support 10 constitutes a part of the torch elevating device 6, and its journal portion 10a is hermetically sealed with respect to the elevating device mounting cylinder 8 via the packing 12 in order to maintain the airtightness of the furnace. In addition, an insulating gland packing 13 is mounted on the inner peripheral surface of the torch insertion hole 9 in order to airtightly insert the plasma torch 5.

On the torch support 10, a torch support 14 is provided.
By connecting the clevis 15 on the lower end side of the clevis 15 and the bracket 16 on the torch support 10 with a pin 17, the clevis is erected so as to be able to roll over in a direction perpendicular to the tilting direction around the trunnion 11. The torch support 14 is provided with an elevator 18 with a ball screw 19 and a ball screw 1 screwed therein.
9 is provided so as to be able to ascend and descend by an elevating mechanism including a motor 20 for rotating the motor 9 and a guide 21. A band 22 that holds the plasma torch 5 electrically insulated from the elevator 18 is attached to the elevator 18. or,
The torch support 10 is provided with a heat shield lid 23 that allows the torch insertion hole 9 to be closed airtight when the plasma torch 5 is pulled out from the torch insertion hole 9. That is,
A swing plate 25 supported by a vertical shaft 24 is provided on the torch support base 10 so as to be swingable via an air cylinder 26. On this swing 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 erected on the revolving plate 25, while the other end is provided with the heat lever. The shielding lid 23 is pivotally mounted so as to be swingable. Therefore, by appropriately operating the air cylinder 26 and the thin air cylinder 30, the airtight closure of the torch insertion hole 9 by the heat shielding lid 23 becomes possible.

At a required position of a furnace lid (side wall) 31 of the furnace body 1, as shown in FIGS. 1 and 2, a slag port 33 provided with an exhaust gas port 32 at an upper portion is provided. A flue 34 that guides exhaust gas discharged upward by suction from a blower (not shown) upward from the flue 32 is hermetically connected to the flue 32. On the other hand, a duct-like gutter 35 that guides the melt 36 and the like to a water tank (not shown) is connected to the slag port 33. At a required symmetrical position with a line passing through the center of the furnace port 1 and the port 33 on the furnace wall opposite to the port 33,
An ash inlet 37 is provided. The angle between the ash inlets 37 and the line connecting the plasma torch 5 (hereinafter referred to as “the angle between the line segments”) is 60 to 60.
The range is 90 °. Furnace wall 3 corresponding to both ash inlets 37
Outside the ash inlets 37, the waste incineration ash 38 is discharged from each of the ash inlets 37 through a substantially intermediate portion between the plasma torch 5 and the furnace wall 31 in a direction perpendicular to the center line (the vertical direction in FIG. 1). Ash input device 39 for alternately pushing horizontally in the direction in which the ash is directed. Double ash input device 39
The direction in which the refuse incineration ash 38 is pushed in is a direction that forms an angle of 5 to 15 degrees with respect to the center line when the angle of the line segment is 60 °, and a center line when the angle that the line segment makes is 90 °. Is a direction at an angle of 30 ° with respect to. Each ash input 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, and the upper and lower parts of the partition chamber 41 are airtightly closed and opened and closed by air cylinders 42 and 43. Upper and lower dampers 44 and 45
And a horizontal extrusion chamber 46 having one end and the other end airtightly connected to a lower part of a partition chamber 41 and an ash input port 37, and a hydraulic cylinder installed in the extrusion chamber 46 for pushing refuse incineration ash 38 into the furnace. The push plate 48 is initially fastened by 47, is slowly moved forward and backward from the middle, and is moved backward. The shutter 50 is air-tightly partitioned from the furnace body 1 in the extrusion chamber 46 and opened and closed by an air cylinder 49. I have.

In FIG. 2, reference numeral 51 denotes a furnace body 1 pivotally supported by the furnace legs 52 on the side of the slag port 33 so that the side of the slag port 33 is lowered. This is a furnace tilting device for discharging (not shown).
Reference numeral 53 denotes a return ash discharging device provided at a lower portion of the extrusion chamber 46. Further, in FIG. 3, reference numeral 54 denotes a torch tilting bracket for tilting the plasma torch 5 together with the torch support 10 and the torch post 14, and in FIG. 4, 55 denotes a torch anti-shake for preventing the torch post 14 from swinging. is there.

The melting treatment of the refuse incineration ash 38 in the refuse incineration ash plasma melting furnace having the above configuration is performed by each ash input device 39.
The refuse incineration ash 38 introduced into the furnace is melted by a plasma frame generated between the plasma torch 5 and the furnace bottom electrode 3, and the melt 36 and the like are discharged from the slag port 33 to the furnace. The flue gas discharged outside and the flue gas
Through the furnace. In the above-mentioned plasma melting furnace, when performing maintenance of the plasma torch 5, the torch elevating device 6 pulls out the plasma torch 5 from the torch insertion hole 9, and after closing the torch insertion hole 9 airtight by the heat shielding lid 23, The plasma torch 5 is rolled over together with the torch support 14, and the rear electrode, vortex generator, gap insulator, collimator, etc. in the torch are inspected or replaced. Therefore, the maintenance work of the plasma torch can be easily and safely performed, and the atmosphere in the furnace can be favorably maintained. In the case where the refuse incineration ash 38 charged into the furnace is unevenly distributed on the melt 36 during the melting process by the plasma melting furnace, the plasma torch 5 is put together with the torch support 14 and the torch support base 10. Is appropriately tilted around the trunnion 11. Therefore, the degree of freedom of the plasma torch 5 becomes 2, and the incineration ash 38 can be melted in an optimum state.

In the above embodiment, the description has been given of the plasma melting furnace in which one furnace bottom electrode and one plasma torch are provided. However, the present invention is not limited to this. The present invention is also applied to a device provided with two or more electrodes, or a device provided with a lower number of furnace bottom electrodes than a plasma torch, or a device 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 in which the refuse incineration ash is pushed by the ash charging device is directed to the slag outlet through almost the middle of the adjacent plasma torch or graphite electrode and the outermost plasma. The direction is directed toward the slag port through substantially the middle between the torch or graphite electrode and the furnace lid. Further, the pushing of the waste incineration ash is not limited to the case where the incineration is performed in a horizontal direction, and may be performed in such a manner that the ash is inclined so that the furnace body side is lowered.

[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 rolled over, so that the maintenance work of the plasma torch can be performed. Can be performed easily and safely. In addition, according to the second refuse incineration ash plasma melting furnace, since the degree of freedom of the plasma torch becomes 2 in addition to the function and effect of the first refuse, the melting process is optimized according to the situation of the refuse incineration ash. Can be done with On the other hand, by providing a heat shield lid that can close the torch insertion hole, it becomes possible to shield the torch insertion hole during maintenance, so that maintenance work can be performed more safely and the atmosphere in the furnace is maintained well. can do.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a plasma melting furnace for refuse incineration ash of 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 part in the plasma melting furnace of FIG. 1;

FIG. 4 is a side view of the plasma torch insertion part of FIG. 3;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 3;

FIG. 7 is a sectional view taken along line VII-VII in FIG. 3;

[Explanation of symbols]

 4 Furnace lid 5 Plasma torch 7 Torch insertion hole 8 Lifting device mounting cylinder 9 Torch insertion hole 10 Torch support 10a Journal part 11 Trunnion 14 Torch support 15 Clevis 16 Bracket 17 Pin 18 Lifting table 19 Ball screw 20 Motor 21 Guide 23 Heat shield lid

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshito Matsuoka 1-3-1 Higashikawasaki-cho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe head office (72) Inventor Akihiko Hayashi 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo No. Kawasaki Steel Corporation Tokyo Head Office (72) Inventor Kenji Nakano 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo Headquarters (72) Inventor Taketoshi Yamazaki 2-2-2 Kanda Jimbocho, Chiyoda-ku, Tokyo No. 30 Tokyo Electric Power Company Development Laboratory (72) Inventor Tomoyasu Shimoyama 2-30 Kanda Jimbocho, Chiyoda-ku, Tokyo Tokyo Electric Power Company Development Laboratory (56) References JP-A-2-122109 (JP) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23J 1/00 F27B 3/20 F27D 11/10 H05B 7/10-7/109 F23G 5/00 115

Claims (3)

(57) [Claims] A torch support provided with a torch insertion hole communicating with the torch insertion hole is provided on a furnace lid, and a torch support is vertically erected on the torch support by pivotally supporting a lower end portion thereof. A plasma melting furnace for refuse incineration ash, wherein an elevating platform capable of holding a plasma torch is provided on a torch support so as to be able to ascend and descend by an elevating mechanism. 2. The plasma melting furnace for refuse incineration ash according to claim 1, wherein said torch support is supported by a trunnion and is provided to be tiltable. 3. The plasma melting furnace for refuse incineration ash according to claim 1, wherein the torch support base is provided with a heat shielding lid capable of airtightly closing the torch insertion hole.