JPH094828A - Disposal method of incineration ash - Google Patents

Abstract

(57) [Summary] [Structure] Incinerator ash produced by incinerating waste is heated and melted without constructing an incinerator, cooled and disposed of as solidified slag. However, a disposal method of supplying to the disposal site substantially continuously and cooling, and a disposal method of depositing the incineration ash to be disposed in advance at the disposal site, heating and melting, and then solidifying by cooling. [Effect] According to the above-mentioned two disposal methods for incinerated ash, the incinerated ash that is buried as it is at the final waste disposal site can be further reduced in volume and disposed of. In addition, such disposal does not require a land or melting furnace separate from the disposal site for melting, and does not require a special cooling device, etc. Can be stored,
Securing the disposal site can be cut in half to treat the same amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention easily reduces the volume of incinerated ash by heating and melting the incinerated ash produced by incinerating waste such as municipal waste at the disposal site and cooling it to solidified slag. The present invention relates to a method of disposing of incinerated ash that is turned into waste.

[0002]

2. Description of the Related Art Waste such as municipal waste is generally landfilled in a landfill, which is the final disposal site. However, the amount of waste is increasing year by year, and securing landfills is becoming a problem, so various volume reductions of waste are being implemented. The most common method for reducing the volume of this waste is to incinerate it in an incinerator to reduce the volume and transport the incinerated ash generated by this incineration to a landfill site for burial. ing.

However, since the incinerated ash produced by such incineration process has a large number of pores and is extremely bulky, it is discharged even when the incombustible dust is completely removed by thoroughly separating the waste. It is difficult to reduce the volume of incinerated ash to 10% or less, and further volume reduction methods are being developed.

For example, a melting furnace has been developed which can incinerate incinerated ash at a high temperature of about 1400 ° C., separates the molten metal content by specific gravity and continuously discharges slag even if it contains a metal content. . With such a method using a special melting furnace capable of processing at a high temperature, the volume of the waste can be reduced to about 5%, and the metal contained in the incinerated ash and further the slag generated, etc. It has the advantage that it can be recovered and reuse of resources can be made possible.

However, such a method using a special melting furnace requires a melting furnace capable of withstanding high temperatures, a special cooling and crushing device for recovering slag and the like, and in some cases, a facility for separating molten metal. Yes, it requires vast land for the construction of incineration facilities. Moreover, in the case of the melting furnace capable of withstanding the high temperature, the furnace itself requires a large amount of cost, and the special cooling device also requires a great cost. Therefore, the method using the special melting furnace cannot be said to be a simple method in terms of cost. Even in such high temperature treatment, the residual slag needs to be transported to the final disposal site and landfilled, and the transportation of waste involves transportation to the incineration facility and transportation to the final disposal site after incineration. It does not reduce the work of transporting at least twice.

[0006]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to easily reduce the volume of incinerated ash obtained by incinerating waste without constructing an expensive melting furnace or cooling device at the disposal site. It is intended to provide a method for treating incinerated ash that can be turned into waste.

[0007]

According to the present invention, there is provided a method of incinerating ashes produced by incinerating waste by heating and melting without constructing an incinerator, cooling and disposing as solidified slag. Provided is a method for disposing of incinerated ash (hereinafter, referred to as a first method), which is characterized in that the incinerated ash is directly melted and supplied substantially continuously to a disposal site and solidified by cooling. Further, according to the present invention, incineration ash produced by incinerating waste is a method of heating and melting without constructing an incinerator, cooling and disposing as solidified slag, incineration ash to be disposed,
Provided is a method for disposing of incinerated ash (hereinafter referred to as a second method), which comprises depositing the material at a disposal site in advance, heating and melting, and subsequently solidifying by cooling.

In the method of the present invention, incineration ash produced by incinerating waste is a residue after incineration of general waste in an incinerator, which is normally landfilled in the final disposal site. It is not particularly limited as long as it is.

In the method of the present invention, the disposal place for treating the incinerated ash is not limited to the hole provided in the usual final disposal site, and may be on the ground, in the valley, inside the caisson foundation, or the like. . Especially in the case of holes, holes of any size can be obtained by adopting a method of constructing a continuous wall around the holes.

In the method of the present invention, the heating and melting of the incineration ash is not particularly limited as long as it can be heated to a temperature at which the incineration ash is melted, preferably 1300 ° C. or higher. Burner heating; arc discharge heating, plasma torch Any of electric heating such as heating can be adopted. At this time, in the method of the present invention, since heat melting is performed without constructing an incinerator or the like, it is necessary to directly melt the incineration ash. This direct melting means, for example, in the case of burner heating, the incineration ash may be directly guided to the burner portion, and in the case of arc discharge heating, a region for arc discharge is formed and melted by passing through this region. And a method in which the electrodes are separated from each other and placed in the incineration ash to be melted by applying an electric current.

In the first method of the present invention, the incineration ash is directly melted and supplied substantially continuously to the disposal site. In this method, for example, an amount of incineration ash that can be instantly melted is used.
It can be carried out by a method of dropping it substantially continuously to the disposal site, and directly melting it by the heating and melting method (excluding the method using an electrode) before dropping it to the disposal site.
The position at which the incinerated ash that falls at this time is heated and melted is not particularly limited as long as the heated and melted melt does not solidify by air cooling before reaching the disposal site. Although it can be appropriately selected depending on the temperature, etc., the position immediately before dropping to the disposal site is preferable. Further, since this heating and melting is carried out without providing a melting furnace or the like, it is preferable to provide a simple shielding means for blocking the flow of air such as wind and rain. As the shielding means, a simple refractory sheet or the like is sufficient because the incinerated ash is instantly exposed to a high temperature only to be melted and is not exposed to a high temperature otherwise. Furthermore, such incineration ash must be melted and supplied to the disposal site substantially continuously. Substantially continuous means, for example, that the volume is such that the supply to the processing place is satisfied in one operation depending on the capacity of the processing place, it can be performed continuously, but the capacity of the processing place is large and the processing is performed. When it is necessary to treat the incinerated ash in multiple steps, it is meant to include the case of being interrupted and restarted. By carrying out substantially continuously as described above, the thermal efficiency at the time of melting can be favorably maintained, and there is no fear that the work will be complicated.

The heated melt of the incineration ash that has fallen to the disposal site is naturally cooled or, if water, muddy water, etc. are present at the processing site, cooled and deposited as solidified slag at the disposal site. At this time, for example, the inside of the caisson foundation is filled with water, and the solidified slag generated by sequentially replacing the filled water while supplying the heating melt inside the caisson has an internal structure of the caisson foundation. You can

On the other hand, in the second method of the present invention, first, the incineration ash to be disposed is deposited in advance at the disposal site. At this time, the amount to be deposited is not particularly limited as long as it is so small as to impair the technical and economic efficiency of the present invention.

The deposited incineration ash can be heated and melted by the above-mentioned burner heating or electric heating, but electric heating such as electric resistance wire energization heating and molten ash energization heating is easy. preferable. Specifically, for example, at least one set of electrodes are separated from each other, inserted into the deposited incinerated ash, a method of melting by energization, a flat electrode is placed on the bottom of the treatment place in advance, The incineration ash may be deposited thereon, and an electrode having an appropriate shape such as a mesh plate may be placed on the upper surface of the deposited incinerator ash to melt the ash.

The above heating and melting operation may be completed once, or when the amount of incinerated ash to be treated is large,
After heating and melting a specific area of the deposited incineration ash, it is possible to sequentially heat and melt from adjacent areas to heat and melt all of the finally deposited incineration ash. Further, on the incineration ash that has been subjected to the heat melting treatment, additional incineration ash can be supplied while heating and melting in the same manner as in the first method, or after depositing the additional incineration ash, as described above. The operation of heating and melting the accumulated incineration ash may be repeated.
When treating these additional incinerated ash, it may be carried out first or after the molten ash that has been heated and melted in the previous time is already completely cooled, but considering the thermal efficiency etc., the first or previous molten ash is It is preferable to heat and melt the following additional incinerated ash when it is not completely cooled.

Natural cooling is sufficient as the cooling following the heating and melting, and the desired volume-reduced solidified slag is deposited at the disposal site.

In the method for disposing of incinerated ash of the present invention, the volume of incinerated ash is reduced to solidified slag for disposal at the disposal site.
The solidified slag thus obtained not only acts as a ground improvement, but can also be dug out and used as a normal slag material. Also, by disposing the disposal place inside the above-mentioned caisson foundation, the caisson foundation can also be used.

[0018]

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a schematic view showing one embodiment of the first method of the present invention, and 10 is a melting system for heating and melting the incineration ash. The melting system 10 comprises a hopper section 11 filled with porous incineration ash 12 to be treated.
A control device 13 for controlling the amount of fall of the incineration ash 12 provided in the lower part of the hopper portion 11, and a burner heating device 14 for instantly heating and melting the incineration ash 12 falling from the lower end opening of the hopper portion 11. And consists essentially of
No melting furnace for melting the incineration ash 12 is provided.

Incinerated ash 1 filled in the hopper section 11
2 is generated when incinerating municipal waste or the like in an incinerator, and can be sequentially added to the hopper unit 11 as needed. The control device 13 is provided with an opening / closing port (not shown) having a squeezing mechanism capable of detecting the molten state of the incineration ash 12 in the burner heating device 14 and automatically controlling the amount of fall of the incineration ash 12. . The burner heating device 14 is equipped with six burners arranged so as to be located on the same circumference, and the incinerated ash 12 falling
The specific atmosphere of 1 is installed so that it can be heated to 1300 ° C. or higher.

The melting system 10 is installed above the incineration ash disposal hole 15 provided in advance at the waste disposal site, and the burner heating device 14 is installed at approximately the height of the ground. Since the melting system 10 does not have a melting furnace, a heat-resistant simple shielding frame 17 is arranged on the ground surface surrounding the incineration ash disposal hole 15 in order to shield the area related to heating and melting of this system from wind and the like. are doing.

Next, a disposal method according to the first method of the present invention when using this system will be described. The incineration ash 12 to be disposed of which is filled in the hopper section 11 is the control device 1
While descending amount is controlled by 3, it descends continuously from the lower end opening of the hopper 11. This incineration ash 1
2 passes through a burner heating device 14 provided on the way of descending, and is exposed to an atmosphere of 1300 ° C. or more and is heated and melted instantly. The incinerated ash 12 in a molten state descends into the incinerated ash disposal hole 15 as it is, and is naturally cooled therein to be deposited as a slag 16. At this time, the surface part where the molten ash of the slag 16 continuously falls is
Since the molten state is substantially maintained, the descending molten ash is sequentially spread and accumulated in the entire area of the incineration ash disposal hole 15. Incinerator ash 1 by such heating and melting / cooling treatment
The volume of 2 can be reduced to about half and deposited in the incineration ash disposal hole 15.

FIG. 2 is a schematic view showing an embodiment of the second method of the present invention, and shows a state in which incineration ash deposited in advance is heated and melted. Reference numeral 20 denotes a hole provided at a final disposal place for disposing of the incineration ash, and a porous incineration ash 23 is previously deposited and placed in the hole 20. Next, at least the tips of the electrode portions 22 of the pair of high-voltage electrode devices 21 are inserted and embedded so as to reach the lower portion of the deposited incineration ash 23. The high voltage electrode device 21 is configured to be able to apply a high current to the electrode portion 22, and the electrode portion 22 is provided with a mechanism (not shown) capable of expanding and contracting.

Next, an electric current is applied to the electrode portion 22 inserted and buried in the incineration ash 23 to heat and melt the incineration ash 23 from the lower portion. During this heating and melting, the electrode part 22 of the high-voltage electrode device 21 is gradually shortened over time, that is, the electrode part 22 is moved upward in the incineration ash 23 and is sequentially moved upward. The incineration ash 23 located is heated and melted.
The molten incineration ash 23 located below is solidified by natural cooling while reducing the volume. At this time, the electrode portion 22
At the stage of shortening, the new incinerated ash 24 is deposited on the incinerated ash 23, and all the incinerated ash can be heated and melted while shortening the electrode portion 22 to the vicinity of the ground surface. By such heating and melting / cooling treatment, incineration ash (23, 2
The volume of 4) can be reduced to about half and deposited in the incineration ash disposal hole 20.

[0025]

EFFECTS OF THE INVENTION Since the incineration ash disposal method of the present invention is intended for the incineration ash that is normally buried at the final waste disposal site and has been volume-reduced in the incinerator, further volume reduction is possible. Can be expected. In addition, since heating and melting / cooling is performed at the disposal site without constructing a melting furnace, there is no need for a land separate from the disposal site for melting, and no particular cooling device is required.
It is advantageous in terms of cost, and the volume of incinerated ash can be easily reduced, and the securing of a disposal site can be reduced to about half when processing the same amount.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a relationship between a melting system and an incineration ash disposal site for explaining an embodiment of a first method of the present invention.

FIG. 2 is a schematic state view showing a state in which a high-voltage electrode device is inserted / embedded in the incinerated ash in which the high-voltage electrode device is deposited, for explaining one embodiment of the second method of the present invention.

[Explanation of symbols]

 12, 22, 23: Incinerated ash 14: Burner heating device 15, 20: Incinerator ash disposal hole 16: Slag 21: High-voltage electrode device

Claims (3)

[Claims] 1. A method of heating and melting incinerated ash produced by incinerating waste without constructing an incinerator, and then cooling and disposing as solidified slag. A method for disposing of incinerated ash, which comprises continuously supplying to the disposal site and solidifying by cooling. 2. A method for incinerating ash produced by incinerating wastes by heating and melting without constructing an incinerator, cooling and disposing as solidified slag, in which the incinerated ash to be disposed is disposed in advance. A method for disposing of incinerated ash, characterized in that after being deposited on, it is heated and melted and then solidified by cooling. 3. The method for disposing of incineration ash according to claim 1, wherein the heating and melting are performed by burner heating, electric heating or a combination thereof.