JPH0694232A - Method and apparatus for continuously processing incinerated ash - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a method and an apparatus for continuous melting of incinerated ash, which is easy to operate, has little heat loss, and can improve work efficiency. [Composition] The incinerator ash is charged into a melting furnace 1 having an incineration ash charging port in the upper part and a semi-solidified slag discharging port in the lower part. The tips of the electrodes 3 and 4 are inserted into the incineration ash to electromelt the incineration ash, and the cooled semi-solidified slag is transferred from the lower opening of the melting furnace 1 onto the transfer means 21 and transferred together with part of the incineration ash. ,
Separate the semi-solidified slag and incinerated ash.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for continuously treating incinerated ash for melting waste incinerated ash.

[0002]

2. Description of the Related Art Conventionally, waste incineration ash in an incinerator is often landfilled. However, since it is becoming more difficult to secure landfill sites year after year, there is a demand for a method of reducing the volume of landfill incineration ash, that is, volume reduction treatment.

In an electric melting furnace facility in which incinerated ash discharged from a refuse incinerator is charged, heated and melted by arc discharge between electrodes, and solidified to reduce the volume, the incinerated ash is not conductive at room temperature. At the time of starting the melting furnace, a conductor such as scrap is put into the furnace and is melted by arc discharge to form a conductive liquid. The incineration ash is put in after forming the conductive liquid, and is heated and melted. Since the slag formed by melting the incinerated ash is electrically conductive, the molten slag is then electrically conductive to generate heat, and the incinerated ash is continuously melted.

Further, the molten slag thus produced is, for example, Japanese Patent Publication No. 62-24694 or Japanese Patent Laid-Open No.
As shown in Japanese Patent Publication No. 177707, it was discharged to the outside from a discharge port provided in the furnace wall.

[0005]

In the conventional electric melting furnace as described above, since it is a batch type, when the operation is stopped, the incinerated ash and slag remaining in the furnace are removed to prepare for the re-operation. However, when the operation is restarted, it is necessary to throw scrap or the like in the vicinity of the electrode to form the conductive liquid, so that not only the heat loss is large but also it is very troublesome.

Although the molten slag is discharged from the discharge port provided in the furnace wall, the temperature of the molten slag decreases due to the distance between the heating section and the discharge port, and depending on the basicity, the molten slag is discharged. May solidify near the exit. Therefore, as shown in, for example, Japanese Patent Laid-Open No. 3-177707, an auxiliary electrode is provided at the discharge port to prevent solidification of the molten slag, which complicates the structure and control system. When the molten slag solidified in the vicinity of the discharge port, it was remelted by oxygen lance or the like.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a continuous melting method and apparatus for incinerated ash that is easy to operate, has a small heat loss, and can improve work efficiency. It was done.

[0008]

A method for continuously treating incinerated ash according to the present invention is to introduce the incinerated ash into a melting furnace having an incinerator ash charging port in the upper part and a semi-solidified slag discharging port in the lower part, and the tip Insert the tips of the electrodes with the distance between the parts smaller than the distance between the other ends into the incinerator ash to electromelt the incinerator ash and move the semi-solidified slag that has moved to the bottom of the melting furnace to the melting furnace. The slag is discharged from the discharge port to a conveying means and is conveyed together with a part of the incinerated ash so that the solidified slag and the incinerated ash are separated.

The incinerator ash continuous treatment apparatus according to the present invention has a melting furnace having an incineration ash charging port in the upper part and a semi-solidified slag discharging port in the lower part, and an incineration ash charging the incineration ash in the melting furnace. A charging means, a plurality of electrodes with a distance between the tip portions being narrower than a distance between the other ends, position adjusting means for adjusting the distance and height between these electrodes, and from the bottom of the melting furnace to the outside thereof. And a substantially inverted V-shaped conveying means provided up to one side.

[0010]

First, the position adjusting means adjusts the heights of the tips of the electrodes and the distance between them. In this state, incinerator ash is put into the furnace, a voltage is applied between the electrodes to generate an arc at the tip, and the incinerator ash is heated and melted. When the molten slag accumulates near the tip of the electrodes, electrical continuity occurs between the electrodes, and a current flows to shift to resistance heating. Therefore, the electrodes are separated from each other to increase the voltage, and the incineration ash is continuously melted.

During this period, the semi-solidified slag that has been melted and moved to the lower part of the furnace is discharged from the discharge port of the melting furnace onto the conveying means and is carried out together with part of the incinerated ash. Then, when reaching the terminal end of the conveying means, the semi-solidified slag is automatically crushed and dropped into a container or the like, and the incinerated ash is separated from this and accumulated in a predetermined place or conveyed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing the structure of an embodiment of the present invention. In the figure, 1 is a melting furnace having an incinerator ash inlet 1a in the upper part and a semi-solidified slag outlet 1b in the lower part. 3 is a first electrode which is arranged almost vertically in the melting furnace 1, and 4 is an angle with respect to the first electrode 3 in which the tip is close to the first electrode 3 and the other end is away from it. The second electrode is arranged so as to be inclined at θ.

Reference numeral 5 is a position adjusting mechanism for the first electrode 3, 6 is a stand, 7 is an electrode holding block mounted on the stand 6 so as to be vertically movable, and 8 is a motor for driving the electrode holding block 7. Reference numeral 9 denotes a bar mounted on the electrode holding block 7 so as to be movable in the left-right direction.
0 holds the first electrode 3. Reference numeral 11 is a motor for driving the bar 9. According to the position adjusting mechanism 5 configured as described above, the motor 8 is driven to move the first electrode 3 in the vertical direction, and the motor 11 is driven to move the first electrode 3 in the horizontal direction. Can be moved to.

Reference numeral 12 is a position adjusting mechanism for the second electrode 4,
Reference numeral 3 is a stand, and 14 is a holding member for the second electrode 4 provided in the melting furnace 1, which holds the second electrode 4 slidably at a predetermined angle. Reference numeral 15 is a holder mounted on the top of the second electrode 4, to which one end of a chain, wire or the like 16 is connected, and this chain or the like 16 is provided with a sprocket 17, 1 provided on a stand.
The counterweight 19 is attached to the other end. A motor 20 drives the sprocket 17. According to the position adjusting mechanism 12 configured as described above, the second electrode 4 can be slid vertically along the holding member 14 by driving the motor 20.

Reference numeral 21 is a belt conveyor having an inverted V shape, which is provided substantially horizontally below the melting furnace 1 and is moved obliquely upward from a position passing through the melting furnace 1, and a sprocket 22.
It is driven by and moves in the direction of the arrow.

Next, the operation of the present invention will be described with reference to FIGS. First, the motor 20 is driven to drive the second electrode 4
Is adjusted so that the tip end of is at the height y from the bottom of the melting furnace 1. Then, the motors 8 and 11 are driven to adjust the tip of the first electrode 3 so that the tip is located at the height y from the lower portion of the melting furnace 1, and the distance from the tip of the second electrode 4 is adjusted. Is adjusted to a predetermined interval x.

In this state, the incineration ash 25 is put into the melting furnace 1 and a voltage is applied between the electrodes 3 and 4 whose tips are buried in the incineration ash 25. The interval x of the tip section is adjusted to generate an arc between the two, and the incineration ash 25 is heated and melted. When the incineration ash 25 is melted and the molten slag 26 is accumulated in the vicinity of the tips of the electrodes 3 and 4, the electrodes 3 and 4 are electrically connected to each other, and a current flows and the resistance is changed to heat. The voltage is increased by separating the interval x between them, and the melting is continued while maintaining the interval x and the applied voltage in the most efficient state.

In the meantime, the molten slag 26 is gradually cooled to produce the semi-solidified slag 27, which is discharged onto the belt conveyor 21 and conveyed in the direction of the arrow from the opening 2 together with a part of the incinerated ash. As is well known, since the semi-solidified slag 27 contains a large amount of glass component, when the semi-solidified slag 27 reaches the end portion of the belt conveyor 21, it is naturally crushed and dropped into a container (not shown), and the incinerated ash 25 is semi-solidified. The slag 27 is automatically separated from the slag 27, dropped on a belt conveyor (not shown), conveyed, and fed into the melting furnace 1 again.

Since the incineration ash 25 thus heated by the semi-solidified slag 27 is circulated into the melting furnace 1, the thermal efficiency can be greatly improved. When melting of the incineration ash 25 progresses and the level of the incineration ash 25 in the melting furnace 1 decreases, a hopper or the like (not shown) provided separately
The incinerated ash 25 is charged from the above to maintain the almost same level at all times to continue melting. As a result, it is possible to secure the covering layer in the fusion zone and prevent a decrease in thermal efficiency.

When the furnace operation is stopped, both electrodes 3, 4
Is lifted, the power supply to the electrodes 3 and 4 is stopped by separating from the molten slag 26, and the belt conveyor 21 is stopped after a certain time (until the transportation of most of the semi-solidified slag 27 is finished). In this case, unlike the prior art, it is not necessary to perform the operation such as discharging the entire melt after melting all the incineration ash in the furnace in consideration of the next operation. When restarting operation,
After the electrodes 3 and 4 are lowered to adjust the interval between the tip sections as described above, if a voltage is applied between the electrodes 3 and 4 to generate an arc at the tip, the incineration ash 25 and the semi-solidified slag are generated. 27 is heated and melted.

In the above description, the first electrode 3 is arranged vertically and the second electrode is arranged obliquely, but each electrode may be arranged obliquely. Also, three or more electrodes may be provided. Further, the electrode position adjusting mechanisms 5 and 12 and the belt conveyor 21 are not limited to those in the above embodiment, and can be appropriately changed.

[0022]

As described in detail above, according to the present invention, a part or all of a plurality of position-adjustable electrodes are arranged in an inclined manner in the melting furnace, and a semi-solidified melt is formed in the lower part of the melting furnace. Since the conveying means for continuously conveying the solidified slag is provided, the following remarkable effects can be obtained. (1) It is not necessary to throw in scrap or the like at the start of the operation, and it is sufficient to adjust the position of the electrode, throw in the incineration ash and turn on the electric current to the electrode.

Further, even when the operation is stopped, there is no need for the troublesome work of melting all the incinerated ash in the furnace and discharging the entire melt in consideration of re-operation as in the conventional case. Workability can be improved because it only has to be separated from the melting portion.

Further, since the semi-solidified slag is continuously carried out by the carrying means and the incineration ash is put into the melting furnace by the feeding means, the working efficiency is greatly improved as compared with the conventional batch type hot water discharge facility. Can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the embodiment of the present invention.

[Explanation of Codes] 1 melting furnace 3 first electrode 4 second electrode 5,12 position adjusting mechanism 21 belt conveyor 25 incineration ash 26 molten slag 27 semi-solidified slag

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Akashi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. In a facility for melting and treating incinerated ash such as waste, the incinerated ash is fed into a melting furnace having an incinerator ash charging port in the upper part and a semi-solidified slag discharging port in the lower part, and the tip part Inserting the tips of a plurality of electrodes whose mutual spacing is narrower than the mutual spacing between the other ends into the incineration ash to electrically melt the incineration ash and move the semi-solidified slag moved to the lower part of the melting furnace to the melting furnace. The method for continuously treating incinerated ash is characterized in that the semi-solidified slag and the incinerated ash are separated from each other by being discharged from a discharge port to a conveying means and conveyed together with a part of the incinerated ash. 2. In a facility for melting and treating incinerated ash such as waste, a melting furnace having an incinerator ash inlet in the upper part and a semi-solidified slag outlet in the lower part, and the incinerator ash in the melting furnace An incineration ash charging means for charging, a plurality of electrodes in which the distance between the tip ends is narrower than the distance between the other ends, position adjusting means for adjusting the distance and height between these electrodes, and the melting furnace An apparatus for continuously treating incinerated ash, comprising: a substantially inverted V-shaped conveying means provided from the lower part to the outside thereof.