JPH07171537A - Incineration ash melting process - Google Patents

Abstract

PURPOSE:To fix heavy metal in incineration ash and prevent the scattering and outflowing of ash by melting and solidifying the incineration ash. CONSTITUTION:In a process, hot ash discharged out of an incinerator 2 or preheated incineration ash is guided into a hot ash melting furnace 7, and then arcing is carried out by aluminum electrodes 6-1 and 6-2 or 8-1 and 8-2, and the incineration ash is heated up to 1800 deg.C or over by the amount of heat by which electrodes catch fire and start burning to turn the incineration ash into molten ash.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for melting incinerated ash which can be performed at a low cost with a compact apparatus for melting incinerated ash.

[0002]

2. Description of the Related Art A huge amount of waste accumulated in local governments is incinerated, and the incineration ash discharged from the incinerator is disposed at a large volume ratio, which is caused by scattering, spillage due to rainfall, and harmful substances due to heavy metals contained therein. There is a problem that pollution such as groundwater pollution will recur.

Therefore, a treatment method has been considered in which incineration ash is melted, cooled and solidified to contain harmful substances.

[0004]

However, the above-mentioned conventional melt processing method requires a large amount of energy and the size of the processing apparatus is large, so that there is a problem that the equipment investment becomes enormous and the processing cost is extremely high. ing.

The present invention solves the above-mentioned conventional problems, and provides an incineration ash melting treatment method capable of efficiently performing melting treatment at a relatively low cost with relatively simple equipment, and energy saving and simple It is an object of the present invention to provide an incinerator ash melting treatment apparatus capable of melting and treating incineration ash extremely efficiently with a simple structure.

[0006]

In order to achieve the above object, the present invention introduces a thermal ash discharged from an incinerator or a preheated incinerator ash to an incinerator ash melting furnace, and an arc discharge is generated by an aluminum electrode. The incineration ash is processed into molten ash by heating the incinerated ash to 1800 ° C or higher according to the amount of heat that the electrode ignites and burns. Then, these are continuously added to the incinerator ash melting furnace, mixed with hot ash or heated ash introduced from the incinerator, and arc discharge is performed by the electrodes installed in the incinerator ash melting furnace, The incineration ash melting treatment method according to the above-mentioned invention, wherein the incineration ash is molten ash by further igniting and burning the inside of the incineration ash and further heating the incineration ash, the electrode of the arc discharge is made of metal electric instead of aluminum. , An electrode obtained by molding the other aluminum scrap is the first or the second invention incinerated ash melting treatment method of aluminum scrap various cans according made of carbon electrode, empty containers, electrical appliances member,
No. 2 above, which is a waste product of construction waste and other aluminum products
Alternatively, it is constituted by the incineration ash melting treatment method according to the third invention.

[0007]

With this structure, the incinerated ash is heated to 1800 ° C. or higher, melted, and mixed with molten aluminum oxide to form molten slag.

[0008]

EXAMPLES The invention of the incineration ash melting treatment method according to claim 1 is the thermal ash discharged from the incinerator at 800 ° C. or higher or 500 in advance.
The incineration ash heated to ℃ or higher is introduced into an incinerator ash melting furnace, and arc discharge is performed by an aluminum electrode.

The invention of the incineration ash melting treatment method of claim 2 is
Thermal ash of 800 ℃ or higher discharged from the incinerator or 50 in advance
Aluminum burnt incinerated ash heated to 0 ° C or higher is ignited, burned, and melted by arc discharge into an incinerator ash melting furnace, mixed with hot ash or heated incinerated ash, and further installed in the incinerator ash melting furnace The electrodes are configured to perform arc discharge.

The invention of the incineration ash melting treatment method of claim 3 is
It consists of various aluminum empty cans, containers, electrical product parts, construction materials, and other aluminum waste materials.

The invention of the incineration ash melting treatment method of claim 4 is
In addition to a metal electrode, a carbon electrode, an electrode obtained by molding a waste aluminum material is used.

A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart of the incineration ash melting treatment system of this embodiment. In Fig. 1 1 waste hopper 2 rotary kiln incinerator 3 waste oil burning burner 4 dust collector 5 compressed aluminum can combustion melting furnace 5-1 compressed aluminum empty can block supply chamber (with feed mechanism) 6 AC welding machine 6-1 aluminum empty Can forming electrode (with servo mechanism) 6-2 Aluminum empty can forming electrode (with servo mechanism) 7 Incinerator ash mixing and melting tank 8 AC welding machine 8-1 Aluminum empty can forming electrode (with servo mechanism) 8-2 Aluminum empty can Molded electrode (with servo mechanism) 9 Molten slag cooling tank 10 Belt conveyor 11 Slag receiving box A method of melting the incinerated ash by the incinerated ash melting apparatus of the present embodiment configured as described above will be described below.

Waste is manually charged from the hopper 1 into the rotary kiln type incinerator 2 which is supported by the waste oil combustion burner 3 at a constant speed. The waste completely burns in the furnace, and the combustion gas passes through the dust collector 4 and is discharged from the flue to the atmosphere.

The incineration ash is sent to the incineration ash discharge section by the rotation of the furnace and falls into the incinerator ash melting furnace 7 by its own weight.

A current is intermittently applied to the aluminum empty can forming electrodes 6-1 and 6-2 connected to the AC welding machine 6, an arc discharge is generated between both electrodes, and the electrodes are heated to a high temperature. ,
Further, the oxygen in the incinerator ash melting furnace 5 adjusted by the air damper and the exhaust damper burns. The combustion heat heats the inside of the furnace to 1800 ° C. or higher, and the incineration ash becomes in a molten state.

Further, the contact portion between the electrodes 6-1 and 6-2 is melted by arc discharge, flows into the melting furnace 7 from the tip portion, falls to the furnace bottom, is mixed with incinerated ash, and is in a molten state. Become.

That is, the incinerated ash and the aluminum melt are mixed to form a molten slag, which is discharged into the molten slag cooling tank 9, rapidly cooled, and solidified into sand.

The solidified sand-like molten slag is transferred from the molten slag cooling tank 9 to the slag receiving box 11 by a screw conveyor 10 having a water separating function.

Table 1 shows the test values. Waste Species Corrugated cardboard Ash 5% Input 1000 kg / h Incinerator furnace temperature 1400 ° C Incinerated ash emission 50 kg / h Bulk specific gravity 0.1 kg / l Incinerator ash melting furnace Internal temperature 2000 ° C High current transformer Discharge conditions Voltage: 50V Current: 100A Discharge cycle: 2 seconds energization, 10 seconds rest Aluminum canister specifications Width: 50, Height: 100, Length 600 Molded electrode Weight: 1.6 kg / piece Electrode consumption: 4 kg / h Bitter slag Production 54 kg / h Particle diameter 1-10 mm Hardness 80-90 kg Bulk specific gravity 2 kg / l Volume change Reduced capacity 1/20 500 liters → 25 liters

[0020]

Industrial Applicability According to the present invention, the bulk specific gravity of incineration ash is reduced to 1/20, which leads to an increase in the storage capacity of the incineration ash processing plant. In addition, harmful metals such as heavy metals contained in incinerated ash are not melted and sealed in the slag particles and do not elute, and pollution problems such as groundwater pollution can be prevented. Since various aluminum cans are used, problems that are difficult to dispose of at the incinerator can be solved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the incineration ash melting treatment method of the present invention.

[Explanation of symbols]

 2 Incinerator 5, 7 Incinerator ash melting furnace 6-1, 6-2 Aluminum electrode 8-1, 8-2 Aluminum electrode

Claims (4)

[Claims] 1. Hot ash discharged from an incinerator or preheated incinerator ash is introduced into an incinerator ash melting furnace, arc discharge is performed by an aluminum electrode, and 1800 ash is burned by the amount of heat at which the electrode ignites and burns. A method for melting and treating incinerated ash, which comprises converting the incinerated ash to molten ash by heating the ash to ℃ or above. 2. A waste aluminum material is preliminarily pulverized or processed into a die shape, which is continuously added to an incinerator ash melting furnace and mixed with hot ash or heated ash introduced from the incinerator to melt the incinerated ash. An incineration ash is made into molten ash by performing arc discharge by an electrode installed in the furnace, igniting and burning inside the incinerator ash melting furnace, and further heating the incineration ash.
(1) The incineration ash melting treatment method described. 3. The arc discharge electrode is a metal electrode instead of aluminum, a carbon electrode, and an electrode obtained by molding a waste aluminum material. (1) or
(2) The incineration ash melting treatment method described. 4. A variety of empty cans, empty containers, aluminum waste materials,
The incineration ash melting treatment method according to claim (2) or (3), which is a waste product of an electrical equipment member, construction waste material, or other aluminum product.