JPH102537A - Ash melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To tilt only a melting furnace and minimize the displacement of sites, belonging to the melting furnace, by a method wherein an electrode rod inserting port, an ash charging port and an exhaust port are arranged in one row while the melting furnace is tilted about an axis in the direction of the row, which is passing through the vicinity of center of an expansion joint at the electrode rod inserting port. SOLUTION: Ash 19, charged through an ash charging port, is heated by an electrode rod 2 and a hearth electrode 3 to melt it. Iron constituents in the ash are reserved on the hearth of the melting furnace 1 as molten metals 11. Molten slag 10, stacked so as to have a given level, is discharged to the outside of the furnace through a slag tapping port. On the other hand, when the molten metals are stacked so as to have a given level, the electrode rod 2 is approximated to the molten metals 11 to generate arc and melt the solidified molten metals 11. Subsequently, the arm of a tilting cylinder 15 is contracted to tilt the melting furnace 1 along the curved surface of a tilting floor 14 and a slide gate valve, blocking a metals tapping port 6, is opened to discharge the molten metals 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash melting furnace for melting incinerated ash discharged from municipal waste incinerators and various incinerators.

[0002]

2. Description of the Related Art Recent waste such as municipal solid waste and sewage sludge is incinerated in incineration facilities such as municipal solid waste incinerators and various incinerators, and the incineration ash and dust (hereinafter referred to as ash) generated in the incineration facilities. ) Is melted by an ash melting facility as shown in FIG. 4 to reduce its volume and render it harmless. In particular, the resistance heating type melting furnace has a counter electrode placed in the melting slag and heats and melts the ash by electric resistance heat (Joule heat) by direct current or alternating current. It has features such as a small amount, no flicker due to not generating an arc, and a slag can be separated by separating molten slag and molten metal.

FIG. 4 shows the overall configuration of an ash melting treatment facility having a resistance heating type melting furnace. Generally, an ash melting treatment facility includes a melting furnace 1, an electrode rod 2, an ash supply device, an exhaust gas treatment device, an electrode rod elevating device, a furnace bottom cooling device, a tilting device, a power supply,
And so on. In the melting furnace 1, an electrode rod 2 is inserted from a ceiling portion, and a furnace bottom electrode 3 is provided at a bottom portion. Each of the electrodes 2 and 3 is connected to a power source. Further, an ash input port 4 and an exhaust port 5 are provided on the ceiling, and are connected to an ash supply device and an exhaust gas treatment device, respectively.
The furnace wall is provided with a slag outlet (not shown) and a metal outlet 6. A cooling duct 7 for blowing cooling air to the furnace bottom is provided below the melting furnace 1, and the cooling duct 7 is connected to a furnace bottom cooling device. Further, the melting furnace 1 is supported by a plurality of furnace legs 1a and 1b, and the furnace legs 1a are fixed to a tilting floor, and the furnace legs 1b
Has a rotatable joint 8 and is fixed to the floor. The tilting bed is supported by a tilting cylinder 9. By raising and lowering the tilting cylinder 9, as shown by a broken line in FIG. 4, the melting furnace 1 is tilted together with the electrode rod lifting device about the joint 8 of the furnace leg 1b. be able to. That is, the tilting cylinder 9, the tilting floor and the furnace legs 1a, 1b
Constitutes a tilting device of the melting furnace 1. The ash supply device supplies the ash discharged from the ash storage tank to the ash input port 4 via a conveyor and a hopper. The electrode rod elevating device vertically controls the electrode rod 2 and controls so that the tip is always immersed in the molten slag 10.

[0004] The ash introduced from the ash inlet 4 is supplied to the electrode rod 2.
Is heated and melted by the furnace bottom electrode 3, most of which is melted as slag 10, and iron in the ash is
1 is stored in the melting furnace 1. At this time, due to the difference in specific gravity, the molten slag 10 is laminated on the upper layer and the molten metal 11 is laminated on the lower layer. The molten slag 10 laminated to a certain level is discharged outside from a slag discharge port (not shown) by overflow or opening and closing of a slide gate valve. On the other hand, most of the molten metal 11 is solidified when the surface is melted by about several mm, so that the slag discharge port and the metal discharge port 6 must be closed unless the molten metal 11 is discharged periodically. There is a possibility that it will be.
Therefore, when discharging the molten metal 11, the electrode rod 2
Is caused to approach the molten metal 11 to generate an arc, and the molten furnace 1 is tilted and discharged to the outside while melting the solidified portion.

[0005]

However, in the ash melting treatment facility described above, since the melting furnace is tilted while melting the molten metal, it is necessary to tilt the electrode rod together with the melting furnace. , The electrode rod elevating device was also tilted together. Therefore, there is a problem that the tilting device becomes large. In addition, since the melting furnace is tilted about the furnace legs, the displacement of the ash inlet, exhaust port, other pipes, wiring, etc. attached to the melting furnace is large, and the structure becomes complicated. Was.

The present invention has been made to solve the above problems. That is, an object of the present invention is to provide an ash melting furnace which can tilt only a melting furnace and discharge molten metal while minimizing displacement of a portion attached to the melting furnace (in particular, an ash input port and an exhaust port). I do.

[0007]

According to the structure of the present invention,
An ashes melting furnace for a melting furnace, in which ash charged into the furnace is heated and melted by an electrode rod and a bottom electrode, and the resulting molten slag, molten metal and exhaust gas are discharged, respectively. An electrode rod insertion port, an ash input port and an exhaust port having expansion joints, a metal discharge port disposed on the furnace wall so as to be perpendicular to the row, and an expansion and contraction of the electrode rod insertion port. A tilting device for tilting the melting furnace about the direction of the row passing near the center of the joint as an axis.

According to the present invention described above, the electrode rod insertion port,
The ash inlet and exhaust port are arranged in a line, and the melting furnace is tilted about the direction of the above-mentioned row passing near the center of the expansion joint of the electrode rod insertion port. The molten metal can be discharged from the slag port with less displacement of the exhaust port and the like. By reducing the displacement of the melting furnace, the electrode rod can be approached to the molten metal without tilting the electrode rod together with the melting furnace only by forming the electrode rod insertion port with an expansion joint. Therefore, it is not necessary to tilt the electrode rod lifting device, the size of the device can be reduced, and the structures such as the ash inlet and the exhaust port can be simplified.

According to an embodiment of the present invention, the tilting device includes a plurality of wheels provided in the melting furnace, a tilting floor having a curved surface for guiding the wheels and supporting the melting furnace, A tilting cylinder for moving the cylinder along the curved surface of the tilting floor,
Preferably, the curved surface in the range in which the wheel moves is an arc centered on the vicinity of the center of the expansion joint of the electrode rod insertion port.

According to the above-described embodiment of the present invention, only the melting furnace can be easily tilted simply by moving the melting furnace along the curved surface. Further, since the curved surface in the range in which the wheel moves is an arc centered on the vicinity of the center of the expansion joint of the electrode rod insertion port, displacement of each expansion joint can be minimized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. Note that the same reference numerals are given to portions common to the related art, and description thereof will be omitted.

FIG. 1 is an overall configuration diagram of an ash melting furnace according to the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. The ash melting furnaces shown in these figures are arranged in a line on the ceiling of the melting furnace 1 and have an electrode rod insertion port 12 having expansion joints 12a, 4a, 5a, an ash input port 4, and an exhaust port 5, and the rows thereof. A metal slag port 6 disposed on the furnace wall so as to be vertical, and a tilting device for tilting the melting furnace 1 about an axis of the row passing near the center of the expansion joint 12a of the electrode rod insertion port 12 as an axis. Have. The tilting device includes wheels 1 provided at the four corners of the melting furnace.
3, a tilting bed 14 having a curved surface for guiding the wheels 13 and supporting the melting furnace 1, and a tilting cylinder 15 for moving the melting furnace 1 along the curved surface of the tilting bed 14.
The curved surface of the moving range of 3 is an arc centered on the vicinity of the center of the expansion joint 12a of the electrode rod insertion port 12. Further, a slag port 20 for discharging molten slag is provided on the furnace wall (see FIG. 2).

As the expansion joints 12a, 4a, 5a, so-called bellows are used. I have. In addition, an electrode rod sealing device 16 is connected to the expansion joint 12a of the electrode rod insertion port 12, and the electrode rod sealing device 16 maintains the airtightness of the melting furnace 1 and allows the electrode rod 2 to be moved up and down. I support it. Further, the inside of the furnace of the electrode rod insertion port 12 is tapered so that the electrode rod 2 does not come into contact even if the melting furnace 1 tilts. The electrode rod 2 is vertically supported by an electrode rod elevating device provided on the tilting bed 14, and its tip is controlled so that it is always immersed in the molten slag.

On the curved surface of the tilting bed 14, the wheels 1 of the melting furnace 1
A groove 17 for guiding the wheel 3 is provided, and the wheel 13 moves in the groove 17. Note that a rail may be prepared instead of the groove 17, and the wheel 13 may be moved on the rail. A plurality of support members 18 are provided on the tilting floor 14 and are fixed to a floor such as a factory. The wiring of the furnace bottom electrode 3 and the cooling duct (not shown) are connected, for example, by providing an opening in the center of the tilted floor 14 (a range where the wheels 13 do not move) and passing the opening. In FIG. 1, the tilting cylinder 15 is rotatably connected to an electrode rod elevating device.
If the electrode rod lifting device is disposed separately from the electrode rod lifting device, a support member for supporting the tilting cylinder 15 may be separately provided.

Next, the operation of the ash melting furnace of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 3 is a diagram showing a state when molten metal is discharged by the ash melting furnace of the present invention.

The ash 19 introduced from the ash inlet 5 is heated and melted by the electrode rod 2 and the furnace bottom electrode 3, most of which is melted as slag 10, and iron in the ash is melted as metal 11, Stored in furnace 1. The molten slag 10 stacked to a certain level is fed to the slab discharge port 20.
(Refer to FIG. 2) and is discharged to the outside by overflow or opening and closing of a slide gate valve. On the other hand, when the molten metal 11 is laminated to a certain level,
First, the electrode rod 2 is brought close to the molten metal 11 to generate an arc, and the solidified molten metal 11 is melted. Subsequently, the arm of the tilting cylinder 15 is contracted to tilt the melting furnace 1 along the curved surface of the tilting bed, and the slide gate valve closing the metal slag port 6 is opened to open the molten metal 11.
To discharge. At this time, the electrode rod 2 is operated by an electrode rod elevating device so as to keep the electrode rod 2 close to the molten metal 11 so that the molten metal 11 does not solidify. Although not shown, the discharged molten metal 11 is directly or indirectly collected in a metal collection container and used for reuse.

According to the above-described ash melting furnace of the present invention, the expansion joints 12a, 4a, 5a are provided in the electrode rod insertion port 12, the ash input port 4, and the exhaust port 5, and the electrode rod insertion port is provided. Since the vicinity of the center of the expansion joint 12a (indicated by X in FIG. 3) is set as the axis of the tilt, displacement of the tilt can be minimized, and the displacement can be reduced.
a, 4a, and 5a. Therefore,
The molten metal 11 can be discharged while the electrode rod 2 is maintained vertically (that is, without tilting the electrode rod lifting device), and the structures of the ash input port 4 and the exhaust port 5 can be simplified. . Further, since the molten metal 11 accumulated in the melting furnace 1 may be used as a part of the furnace bottom electrode 3, it is not necessary to discharge all the molten metal 11 by the ash melting furnace of the present invention. The tilt of the melting furnace 1 may be made smaller so that only the minimum molten metal 11 is discharged. Further, by changing the position of the metal slag port 6, the amount of tilting of the melting furnace 1 and the amount of molten metal discharged can be adjusted.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

[0019]

According to the ash melting furnace of the present invention described above, only the melting furnace can be tilted, and the displacement of the electrode rod insertion port, ash input port, exhaust port, etc. can be reduced.
It has excellent effects such as being able to discharge molten metal while reducing the size and simplification of the apparatus.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an ash melting furnace of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a diagram showing a state when molten metal is discharged by the ash melting furnace of the present invention.

FIG. 4 is an overall configuration diagram of an ash melting processing facility having a conventional resistance heating type melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting furnace 1a, 1b Furnace leg 2 Electrode rod 3 Furnace bottom electrode 4 Ash inlet 4a Expansion joint of ash inlet 5 Exhaust port 5a Expansion joint of exhaust port 6 Metal tapping 7 Cooling duct 8 Furnace joint 9 Tilt Cylinder 10 molten slag 11 molten metal 12 electrode rod insertion port 12a expansion joint of electrode rod insertion port 13 wheels 14 tilting floor 15 tilting cylinder 16 electrode rod sealing device 17 groove 18 support member 19 ash 20 slag discharge port

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Tahara 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Technical Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. No. 1 Ishi Kawashima Harima Heavy Industries, Ltd.

Claims (2)

[Claims] An ash melting furnace for heating and melting ash charged in a furnace by an electrode rod and a bottom electrode, and discharging the generated molten slag, molten metal and exhaust gas, respectively. An electrode rod insertion port, an ash input port, and an exhaust port that are arranged in a row on the ceiling and have expansion joints; a metal slag port disposed on the furnace wall so as to be perpendicular to the row; and the electrode rod insertion port An inclining device for inclining the melting furnace about an axis of the row passing near the center of the expansion joint. 2. The tilting device includes: a plurality of wheels provided in a melting furnace; a tilting floor having a curved surface for guiding the wheels and supporting the melting furnace; and moving the melting furnace along a curved surface of the tilting floor. 2. The ash melting furnace according to claim 1, wherein the curved surface of the range in which the wheel moves is an arc centered on the vicinity of the center of the expansion joint of the electrode rod insertion port. 3.