JP2003302034A - Melting furnace and incineration ash melting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melting furnace and an incineration ash melting method wherein a plasma torch is automatically inserted into a furnace body, the same is evacuated to the outside of the furnace body, and a tip of the plasma torch is moved longitudinally, laterally and vertically to move a plasma arc generation place. <P>SOLUTION: In this melting furnace comprising the furnace body 3 and the plasma torch 4, and melting the incineration ash including a substance of high melting point charged into the furnace body 3 by the plasma arc generated between counter electrodes mounted on the plasma torch 4 and the furnace body 3, a torch traveling device is mounted for inserting the plasma torch 4 into the furnace body 3, and evacuating the same to the outside of the furnace body 3. The torch traveling device longitudinally, laterally and vertically travels the tip of the plasma torch 4 to move the plasma arc generation place, when the plasma torch 4 is inserted into the furnace body 3. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melting furnace for melting and treating incinerated ash generated by incinerating municipal waste, sewage sludge, or other waste in a waste incinerator.

[0002]

2. Description of the Related Art As a method for reducing the volume of incinerated ash generated by incinerating municipal waste, sewage sludge, or other wastes in a waste incinerator, this incinerated ash is used in a melting furnace such as a plasma arc furnace. A method of charging and melting is performed. FIG. 1 is a diagram showing a schematic configuration of a plasma arc furnace which is a conventional melting furnace of this type. The plasma arc furnace 1 is provided with a furnace lid 2 and a furnace body 3, a torch insertion port 5 for inserting a plasma torch 4 is provided in the furnace lid 2, and a counter electrode facing the plasma torch 4 is provided at the bottom of the furnace body 3. 6 is provided.
A voltage is applied between the plasma torch 4 and the counter electrode 6, a plasma arc 10 is generated between the plasma torch 4 and the counter electrode 6, and the incinerator ash 7 charged into the furnace body 3 is melted and melted by the heat of the plasma arc 10. Slug 8 The molten slag 8 is discharged from the discharge port 9 to the outside of the furnace by overflow, cooled, and then used for landfill disposal and recycling (roadbed material, etc.). Moreover, it is molded by a molding machine and commercialized. The exhaust gas G generated by the melting of the incineration ash 7 is sent to an exhaust gas processing system (not shown) for processing.

In the plasma arc furnace 1 having the above structure,
In order to melt-process wastes containing oxide as a main component such as incineration ash 7, first, the plasma torch 4 is inserted into the furnace body 3 and the space and position between the plasma torch 4 and the re-ignition rod are adjusted. , Plasma arc 1 between plasma torch 4 and re-ignition rod
It is necessary to generate 0. Further, during the operation of the melting furnace, it is necessary to move the tip of the plasma torch 4 up, down, front and back, and left and right in order to adjust the arc power or the heating point.
Further, when the plasma torch 4 is replaced for maintenance or the like, it is necessary to retract the used plasma torch 4 to the outside of the furnace body 3 and replace it with an unused plasma torch 4.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is a plasma for inserting a plasma torch into the furnace body, retracting it from the furnace body, and moving a plasma arc generation place. An object of the present invention is to provide a melting furnace capable of automatically moving the tip of the torch back and forth, left and right, and up and down, and a method for melting incineration ash.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a furnace body and a plasma torch, and incinerator ash containing a high melting point substance charged into the furnace body is supplied to the plasma. In a melting furnace that melts by a plasma arc generated between a torch and a counter electrode provided in the furnace body, a torch moving device that can insert the plasma torch into the furnace body and retract it outside the furnace body is provided. Is characterized by.

By providing the torch moving device as described above, it becomes easy to insert and retract the plasma arc into and out of the furnace body, and maintenance work such as replacement of the plasma torch becomes easy.

According to a second aspect of the present invention, in the melting furnace according to the first aspect, the torch moving device moves the plasma torch tip forward and backward when inserting the plasma torch into the furnace body.
It is characterized by comprising a plasma arc generation position adjusting mechanism capable of moving to the left and right and up and down to move the place where the plasma arc is generated.

As described above, since the torch moving device is provided with the plasma arc generation position adjusting mechanism, it is possible to move the place where the plasma arc is generated and prevent the fluctuation of the arc power, and at the same time, the plasma arc accompanying the fluctuation of the arc power. Can be prevented from disappearing.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the melting furnace according to the item 1, the driving source for inserting / retracting the plasma torch of the torch moving device and / or the front end of the plasma torch of the plasma arc generation position adjusting mechanism
It is characterized in that it is moved left and right and up and down and the drive source is electric or hydraulic.

The invention according to claim 4 is the invention according to claim 1 or 2.
The melting furnace according to claim 3, further comprising a furnace body tilting mechanism for tilting the furnace body, wherein the torch moving device and / or the plasma arc generation position adjusting mechanism includes a furnace body tilting mechanism for tilting the furnace body when the furnace body tilts. It is characterized in that it is tilted together with it and is operable even in the tilted state.

According to a fifth aspect of the present invention, there is provided a method for melting incineration ash in which a plasma arc is generated between a plasma torch and a counter electrode provided in a furnace body, and the incineration ash containing a high melting point substance is melted by the plasma arc. The plasma generation position is adjusted by moving the plasma torch in the furnace body.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 2 and 3 are views showing a schematic configuration example of the melting furnace according to the present invention, FIG. 2 is a plan view, and FIG. 3 is a side view. 2 and 3, the parts denoted by the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. A plasma arc furnace 1 which is a melting furnace includes a furnace lid 2 and a furnace body 3. The furnace lid 2 is provided with a torch insertion port 5 into which a plasma torch 4 is inserted, and the bottom of the furnace body 3 faces the plasma torch. Then, a counter electrode (not shown) is provided.

Reference numeral 20 is a plasma torch insertion mechanism for inserting the plasma torch 4 into the plasma arc furnace 1 from the torch insertion port 5. The plasma torch insertion mechanism 20 is provided with a vertical movement mechanism 25, and the plasma torch 4 is attached to the vertical movement mechanism 25 so that it can be moved up and down. The vertical movement mechanism 25 of the plasma torch insertion mechanism 20 is a swivel base 23 supported by a support column 21 by a swivel mechanism 22 and the like so as to be rotatable.
Is attached via a bracket 24. Further, an incineration ash supply device 26 for supplying incineration ash containing a high melting point substance into the furnace body 3 around the furnace body 3 of the plasma arc furnace 1.
Are installed. Further, a discharge port 27 (corresponding to the discharge port 9 in FIG. 1) for discharging exhaust gas and molten slag is provided around the furnace body 3.

As will be described in detail later, the plasma torch insertion mechanism 20 has a turning mechanism 22 including a worm wheel and a gear, etc., so that the plasma torch 4 is located at a position A shown by a solid line in FIG. It is possible to turn between a position where the plasma torch 4 is located and a position B shown by a chain line, that is, a retracted position of the plasma torch 4. Further, the plasma torch insertion mechanism 20 is provided with a back-and-forth moving mechanism 29 so that the plasma torch 4 can be tilted in the back-and-forth direction by the back-and-forth moving mechanism 29 as will be described later in detail. Further, the plasma torch insertion mechanism 20 is provided with a left-right movement mechanism 30, and the plasma torch 4 can be tilted in the left-right direction by the left-right movement mechanism 30 as described later in detail.

4 to 6 are views showing the structure of the plasma torch insertion mechanism. FIG. 4 is a plan view, FIG. 5 is a side view (a view taken in the direction of arrow C of FIG. 4), and FIG. 6 is a rear view (of FIG. 4). It is a D arrow view).
As shown in the figure, the plasma torch 4 is moved by the left-right movement mechanism 30 in the left-right direction by a predetermined angle α ° (for example, α = 10 °), and by the front-back movement mechanism 29 in the front-back direction by a predetermined angle β ° (for example, β = 1).
It is possible to tilt back and forth in the range of 0 °).

The left / right moving mechanism 30 is a left / right moving motor 30-1.
And a connecting rod 30-2 and the like, and the tip of the connecting rod 30-2 is connected to the casing of the vertical movement mechanism 25. By rotating the horizontal movement motor 30-1 in the forward and reverse directions, the rotational force thereof is converted into a force for moving the connecting rod 30-2 in the horizontal direction, the vertical movement mechanism 25 is tilted in the horizontal direction, and the tip of the plasma torch 4 is moved. Move to the left and right. This tilting is caused by the bracket 2 attached to the casing of the vertical movement mechanism 25.
4 is guided by a guide rail 33 which is interposed between the bracket 4 and the bracket 32 attached to the swivel base 23.

The forward / backward movement mechanism 29 includes a forward / backward movement motor 29-1 and a connecting rod 29-2. It is connected to the movable side. By rotating the forward / backward movement motor 29-1 in the forward / reverse direction, the rotational force thereof is converted into a force for moving the connecting rod 29-2 in the forward / backward direction,
The vertical movement mechanism 25 is tilted in the front-back direction. The tip of the plasma torch 4 moves in the front-rear direction in association with the tilting of the vertical movement mechanism 25. This tilt is guided by the guide rail 35.

FIG. 7 is a diagram showing a structural example of the vertical movement mechanism 25. The vertical movement mechanism 25 includes a casing 25-1 and a vertical movement motor 25-2. A ball screw 25-3 is rotatably arranged in the casing 25-1, and the ball screw 25-3 is vertically movable through a speed reducer 25-4.
The rotational force of -2 is transmitted. A nut 25-5 is screwed onto the ball screw 25-3,
A plasma torch mounting base 37 for mounting the plasma torch 4 is fixed to -5 via a bracket 36. Further, the plasma torch 4 is attached to the plasma torch mount 37 via a bracket 38.

A guide rail 39 for guiding the vertical movement of the plasma torch mount 37 is attached to the side surface of the casing 25-1, and the ball screw 25-3 is rotated by the rotation of the vertical movement motor 25-2. , Nut 25-
As the 5 moves up and down, the plasma torch mount 37
The plasma torch 4 attached to the is movable up and down. The vertical position of the plasma torch 4 is detected by the rotary encoder 40.

8 and 9 show the plasma torch insertion mechanism 2
It is a figure which shows the structure of the turning mechanism which turns 0, FIG. 8 is a top view, FIG. 9 is a EE arrow view of FIG. The swivel mechanism 22 includes a worm gear 22-1 and a swivel motor 22-2 with a clutch / brake, and the worm gear 22-1 is rotatably supported by a mounting base 41 fixed to the support column 21,
The turning motor 22-2 is fixed to the mounting base 41.
The rotational force of the turning motor 22-2 is transmitted to the worm gear 22-1 via the joint 22-3.

The swivel base 23, as shown in FIG.
Is rotatably supported at the upper end of the bearing via a bearing 42,
A worm wheel 43 is attached to the lower end of the swivel base 23. The worm gear 22-1 is screwed onto the worm wheel 43, and the plasma torch 4 is rotated between the A position and the B position in FIG. 2 by the forward / reverse rotation of the turning motor 22-2. The swivel base 23 is at the position A in FIG.
It is locked by 4.

In the plasma torch insertion mechanism 20 having the above structure, the position B in FIG. 2 is the retracted position of the plasma torch 4, and the maintenance or replacement of the plasma torch 4 is performed at this position. To insert the plasma torch 4 into the plasma arc furnace 1, the plasma torch insertion mechanism 2 is rotated by the turning mechanism 22.
0 is swung to the A position, that is, the position where the plasma torch 4 is located right above the torch insertion opening 5, and the swivel base 23 is locked by the lock mechanism 44. After that, the vertical movement mechanism 25 lowers the lower end of the plasma torch 4 until it reaches a predetermined position of the furnace body 3 as shown in FIG. The amount of descent is detected by the rotary encoder 40. In FIG. 10, reference numeral 8'denotes a base metal formed below the molten slag 8 layer.

A plasma arc 10 is generated between the plasma torch 4 and the counter electrode 6, and the incinerator ash supply device 26 causes the furnace body 3 to move.
The incineration ash 7 containing the oxide as a main component is melted therein. When the incineration ash 7 having a non-uniform composition such as an oxide is put on the molten slag 8, the arc power fluctuates as described above,
There is a fear that the phenomenon of extinguishing the plasma arc 10 may occur. Therefore, in the present embodiment example, the plasma torch insertion mechanism 20 includes a vertical movement mechanism 25, a front-back movement mechanism 29, and a left-right movement mechanism 3.
0, the tip of the plasma torch 4 is moved up, down, front and back, and left and right to change the place where the plasma arc 10 is generated, to suppress fluctuations in arc power and to keep the plasma arc 10 in a stable state without disappearing. I am trying.

Although not shown, when the furnace body 3 of the plasma arc furnace 1 is mounted on a frame and a furnace body tilting mechanism for tilting the furnace body 3 is provided, the plasma torch is inserted into the frame. A support column 21 that supports the mechanism 20 is attached. As a result, in the state in which the furnace body 3 is tilted by the furnace body tilting mechanism, the vertical movement mechanism 25, the forward-backward movement mechanism 29, and the left-right movement mechanism 30 of the plasma torch insertion mechanism 20 are operated,
It is also possible to move the tip of the plasma torch 4 vertically, forward and backward, and left and right to change the place where the plasma arc 10 is generated.

Although the plasma torch 4 is inserted into the plasma arc furnace 1 by the dedicated plasma torch insertion mechanism 20, the plasma torch insertion mechanism 20 includes a plasma torch and other equipment such as a columnar re-ignition rod. May be installed in parallel with the re-ignition rod insertion mechanism for inserting into the furnace body.

FIG. 11 is a plan view showing a schematic structural example of a melting furnace provided with a plasma torch insertion mechanism provided with a re-ignition rod insertion mechanism. As shown in the drawing, the plasma torch insertion mechanism 20 includes a plasma torch 4 and a vertical movement mechanism 25.
A chucking mechanism 50 and an up-and-down moving mechanism 51 that constitute a re-ignition rod insertion mechanism are provided side by side. The vertical movement mechanism 51 is a mechanism for moving the chucking mechanism 50 in the vertical direction, and has substantially the same configuration as the vertical movement mechanism 25 shown in FIG. 7. Although not shown, the chucking mechanism 50 holds the columnar re-ignition rod by the lowering operation at the position B in FIG. 11, lowers the re-ignition rod at the position A into the furnace body, and It is configured so that it can be released with one touch while being placed on.

[0027]

As described above, according to the invention described in each claim, the following excellent effects can be obtained.

According to the first aspect of the present invention, by providing the torch moving device, it becomes easy to insert and retract the plasma arc into and out of the furnace body, and maintenance work such as replacement of the plasma torch becomes easy.

According to the second aspect of the invention, since the torch moving device is provided with the plasma arc generation position adjusting mechanism, it is possible to move the place where the plasma arc is generated and prevent fluctuations in arc power. The heating point by the plasma arc can be adjusted as required.

According to the third aspect of the present invention, the tip of the plasma torch is moved back and forth, left and right, and up and down, and an electric or hydraulic pressure is used as a drive source. Therefore, the control and configuration for performing these moving operations are easy. Become.

According to the fourth aspect of the present invention, the torch moving device and / or the plasma arc generation position adjusting mechanism is configured to be operable even when the furnace body is tilted.
The plasma arc generation position can be adjusted even when the furnace body is tilted.

According to the fifth aspect of the present invention, since the position where the plasma arc is generated is adjusted by moving the torch, stable plasma can be generated at the optimum position where the plasma arc is generated.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a plasma arc furnace which is a conventional melting furnace.

FIG. 2 is a plan view showing a schematic configuration example of a melting furnace according to the present invention.

FIG. 3 is a side view showing a schematic configuration example of a melting furnace according to the present invention.

FIG. 4 is a plan view of the plasma torch insertion mechanism of the melting furnace according to the present invention.

FIG. 5 is a side view of the plasma torch insertion mechanism of the melting furnace according to the present invention (viewed from the arrow C in FIG. 4).

FIG. 6 is a rear view (a view from the arrow D in FIG. 4) of the plasma torch insertion mechanism of the melting furnace according to the present invention.

FIG. 7 is a diagram showing a configuration of a vertical movement mechanism of the plasma torch insertion mechanism of the melting furnace according to the present invention.

FIG. 8 is a diagram showing a configuration of a swivel mechanism of a plasma torch insertion mechanism of a melting furnace according to the present invention.

9 is a view as seen from the arrow EE of FIG.

FIG. 10 is a diagram showing a state in which a plasma arc is generated in the melting furnace according to the present invention.

FIG. 11 is a plan view showing a schematic configuration example of a melting furnace according to the present invention.

[Explanation of symbols]

1 Plasma arc furnace 2 furnace lid 3 furnace body 4 plasma torch 5 Torch insertion slot 6 opposite poles 7 Incinerated ash 8 Molten slag 8'base metal 9 outlet 10 plasma arc 20 Plasma torch insertion mechanism 21 props 22 Turning mechanism 22-1 Worm gear 22-2 Swing motor 22-3 Joint 23 swivel base 24 bracket 25 Vertical movement mechanism 25-1 casing 25-2 Vertical movement motor 25-3 Ball screw 25-4 Reducer 25-5 Nut 26 Incineration ash supply device 27 outlet 29 Forward / backward movement mechanism 29-1 Forward-backward motor 29-2 Connecting rod 30 Left-right movement mechanism 30-1 Horizontal movement motor 30-2 Connecting rod 32 bracket 33 Guide rail 34 bracket 35 Guide rail 36 bracket 37 Plasma torch mount 38 bracket 39 Guide rail 40 rotary encoder 41 mounting base 42 bearing 43 Worm Wheel 44 Lock mechanism 50 chucking mechanism 51 Vertical movement mechanism

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27B 3/20 F27D 11/08 E 4K045 F27D 11/08 G21F 9/30 551K 4K063 G21F 9/30 551 H05B 7 / 109 Z H05B 7/109 7/18 E 7/18 H05H 1/32 H05H 1/32 B09B 3/00 303L (72) Inventor Jinbo Gen 11-11 Haneda-Asahicho, Ota-ku, Tokyo Inside EBARA CORPORATION (72) Inventor Toshiro Amemiya 11-1 Haneda-Asahi-cho, Ota-ku, Tokyo F-term inside EBARA CORPORATION (reference) 3K061 NB02 NB27 3K084 AA08 AA11 BC02 BC03 DA00 4D004 AA36 AC04 CA29 CA43 CB04 CB31 4G068 CA09 CB75 A070G0 4G0 AA37 AA51 BB03 DA02 EB01 EB43 ED13 4K045 AA04 BA10 RB02 4K063 AA04 AA12 BA13 CA01 CA05 FA56 FA66

Claims (5)

[Claims] 1. A furnace body and a plasma torch are provided, and the incineration ash containing the high melting point substance charged into the furnace body is melted by a plasma arc generated between the plasma torch and a counter electrode provided in the furnace body. In the melting furnace described above, a torch moving device capable of inserting the plasma torch into the furnace body and retracting the plasma torch from the furnace body is provided. 2. The melting furnace according to claim 1, wherein when the torch moving device inserts the plasma torch into the furnace body, the tip of the plasma torch is moved forward and backward, left and right,
A melting furnace comprising a plasma arc generation position adjusting mechanism which can be moved up and down and moved to a place where the plasma arc is generated. 3. The melting furnace according to claim 1, wherein the plasma torch insertion / retraction driving source of the torch moving device and / or the plasma torch tip of the plasma arc generation position adjusting mechanism is moved forward / backward / left / right. A melting furnace which is moved up and down and whose drive source is electric or hydraulic. 4. The melting furnace according to claim 1, 2 or 3, further comprising a furnace body tilting mechanism for tilting the furnace body, wherein the torch moving device and / or the plasma arc generation position adjusting mechanism is the furnace. A melting furnace configured such that when the furnace body is tilted by a body tilting mechanism, the furnace body tilts together with the furnace body and is operable even in the tilted state. 5. A method for melting incineration ash, which comprises melting an incineration ash containing a high melting point substance between a plasma torch and a counter electrode provided in a furnace body and melting the plasma ash by the plasma arc. A method for melting incinerated ash, characterized in that the generation position of the plasma is adjusted by moving a torch.