JP3060197B2 - Incineration ash melting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incineration ash melting apparatus, and more particularly to an incineration ash generated by incineration of municipal solid waste, sewage sludge, and other wastes in an incinerator, particularly in the form of fine powder. The present invention relates to an apparatus for performing a melting process.

[0002]

2. Description of the Related Art In recent years, incinerated ash generated by incinerating municipal solid waste, sewage sludge, and other waste has been increasing, and it has become difficult to secure landfill sites. For this reason, non-pollution, volume reduction, and resource recycling are being performed by incineration ash melting.

[0003] In particular, since incineration ash in the form of fine powder (fine incineration ash) collected by an electric dust collector or the like provided in an incinerator often contains heavy metal particles, it is necessary to eliminate pollution. It is also required to perform a melting treatment. As a method of melting such a fine powder incinerated ash, an arc furnace method,
An oil burner method, a plasma method and the like have been put to practical use.

[0004]

However, when the above-mentioned incinerated ash is introduced into a melting furnace, the ash is liable to be scattered because of the fine powder, and the deposit of the fine powder has low thermal conductivity.
Melting treatment is difficult due to low efficiency of heating from the surface.

[0005] The arc furnace method, which is a conventional treatment method, is difficult to operate due to strict control of the moisture in the incineration ash. In the oil burner method, a surface melting furnace has been put into practical use. It is difficult to completely melt metals such as empty cans inside. Furthermore, the plasma method can completely melt incineration ash including metal components, but requires power of 800 kWh or more per ton of incineration ash, and usually uses the power generated by refuse power generation. Now that the external sales environment is improving, it has economic problems.

Accordingly, an object of the present invention is to provide an incineration ash melting apparatus capable of efficiently melting fine incineration ash which has been difficult to treat by re-scattering.

[0007]

Means for Solving the Problems In order to achieve the above-mentioned object, an incineration ash melting apparatus according to the present invention is an apparatus for melting and processing incineration ash generated from an incinerator in a melting furnace. less the oxygen-enriched gas and combustion-supporting gas
With one spray burner, a flame is projected on the furnace wall
And a path for introducing at least a part of the incineration ash into the flame of the thermal spray burner is provided.

Further, according to the present invention, in the above structure, an apparatus for preheating the oxygen or the oxygen-enriched gas or the gas for conveying the incinerated ash into the flame of the thermal spray burner is provided in the exhaust gas path of the melting furnace. It is characterized by that.

The means for supplying the incinerated ash into the flame of the thermal spray burner may be supplied directly to the burner by a screw feeder or the like, instead of using a carrier gas. Further, the fuel for the thermal spray burner may be any of gas, liquid and solid, and the most economically available fuel may be appropriately selected.

[0010]

[Operation] The incineration ash introduced into the flame of the above-mentioned thermal spray burner melts and softens in the flame of the thermal spray burner, adheres to the furnace wall in front of the thermal spray burner, and then flows downstream to be discharged. In addition, since molten incineration ash (molten ash) adheres to the furnace wall in front of the thermal spray burner, particles that do not melt in the flame are captured by the molten ash and do not scatter.

Further, oxygen or an oxygen-enriched gas supplied to the spraying burner or a gas carrying fine powder incineration ash is preheated by thermal energy of exhaust gas from the melting furnace, and is generated by the spraying burner. The flame temperature can be raised, and the melting processing capacity of incinerated ash can be improved.

The coarse incineration ash can be put into a melting furnace by a usual method and can be melted by a heat source such as the above-mentioned thermal spray burner or another burner.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to an embodiment shown in the drawings. The incineration ash melting apparatus shown in FIG. 1 includes a melting furnace 2 having a spraying burner 1 for melting incineration ash, and a fuel for supplying a fuel, a combustion supporting gas, and fine powder incineration ash to the spraying burner 1, respectively. Supply route 3,
A combustion supporting gas supply path 4 and an incineration ash supply path 5, a molten ash outlet 6 for taking out incinerated ash (molten ash and molten slag) melted in the melting furnace 2, and discharging a combustion gas generated in the melting furnace 2. Exhaust gas path 7.

The spraying burner 1 has a flame on the furnace wall 21.
In order to be projected, the front of the injection port is installed in the melting furnace 2 so as to face the furnace wall 21, and the furnace wall 21 is configured such that molten ash adhering to the furnace wall 21 portion is located in the lower part of the furnace. It is formed so as to flow naturally in the direction of the molten ash outlet 6.

When a liquid fuel (heavy oil or the like) is used, the fuel supply path 3 has a fuel storage tank 31 as shown in FIG.
And other fuel pumps 32. When other gaseous fuels and solid fuels are used, they are formed with optimal configurations.

The combustion supporting gas supply path 4 comprises an oxygen supply facility 41 and a heat exchanger 8. The combustion supporting gas supplied from the oxygen supply facility 41, that is, oxygen gas or oxygen-enriched gas is supplied. The gas is heat-exchanged with the exhaust gas in the heat exchanger 8 to be heated and then supplied to the thermal spray burner 1.

The incineration ash supply path 5 includes a feeder 51 for supplying a constant amount of fine incineration ash, and a compressor 52 for supplying air serving as a carrier gas for incineration ash conveyance. The supplied fine powder incineration ash is
The pressure is increased by the compressor 52, the heat is exchanged with the exhaust gas by the heat exchanger 8, and the carrier gas is supplied to the spraying burner 1 while being accompanied by the heated carrier gas.

The fuel supplied from the fuel supply path 3 to the thermal spray burner 1 mixes with the oxidizing gas supplied from the oxidizing gas supply path 4 and burns to generate a high-temperature flame. The fine powder incineration ash supplied from the incineration ash supply path 5 to the thermal spray burner 1 and introduced into the flame melts and softens in the flame and adheres to the furnace wall 21 in front of the burner. Further, the fine powder incineration ash that has not been melted in the flame is projected on the furnace wall 21 accompanying the flame, is captured by the molten ash attached to the furnace wall 21, and is melted here.

The incinerated ash melted in the melting furnace 2, that is, the molten ash flows from the furnace wall 21 to the lower part of the furnace, is taken out through the molten ash outlet 6 at the furnace bottom, is pulverized by appropriate means, and is aggregated. Used as etc. The gas generated in the furnace is discharged from the exhaust gas path 7.

The exhaust gas path 7 includes a dust collector 71 and an exhaust fan 72.
And air inlets 73 and 74 for adjusting the exhaust gas temperature as required, and the heat exchanger 8 for heating the combustion supporting gas and the carrier gas.
The exhaust gas discharged from the melting furnace 2 is first supplied to the air inlet 7
3 and mixed with air sucked through a flow control damper 73a, and is introduced into the heat exchanger 8 at a predetermined temperature, for example, a temperature that the heat exchanger 8 can withstand. Raise the temperature of the gas.

The exhaust gas discharged from the heat exchanger 8 is further mixed with air sucked through an air inlet 74 through a damper 74a for adjusting the flow rate, and when the temperature of the exhaust gas falls below the heat-resistant temperature of the dust collector 71, the dust is collected. After being introduced into the exhaust device 71 and separating fine powder accompanying the exhaust gas, the exhaust gas is discharged from the exhaust fan 72. The fine powder collected by the dust collector 71 may be supplied again to the thermal spray burner 1 and subjected to a melting treatment.
Since it is a spherical product once melted, it can be effectively used as it is.

In addition, lump incineration ash other than the fine powder incineration ash supplied from the incineration ash supply path 5 is supplied into the melting furnace 2 by ordinary means, and is supplied to the spraying burner 1 or a separately provided melting burner (see FIG. (Not shown).

The shape of the melting furnace 2 is not limited to the above embodiment. For example, as shown in FIG. A passage 23 may be provided, and an exhaust gas outlet may be provided above the passage 23 and a molten ash outlet may be provided below the passage 23. As shown in FIG. Up and down passages 24 each having an outlet
The spraying burner 1 may be attached so that the flame is projected on the side wall of the nozzle.

[0024]

[0025]

As described above, the incineration ash melting apparatus of the present invention is provided in a melting furnace so that a flame is projected on the furnace wall.
Since the incineration ash was injected into the flame of the thermal spray burner, the incineration ash injected into the flame of the thermal spray burner
Melts and softens in the flame of the spray burner,
After adhering to the front furnace wall, it flows downstream and is discharged,
But the incineration ash that could not be melted in the flame adhered to the furnace wall
Difficult to treat by being trapped by molten ash and re-scattering conventionally
Was able to efficiently melt the fine powder incineration ash
You.

Further, since the incineration ash melting apparatus of the present invention uses a thermal spray burner using oxygen or an oxygen-enriched gas as a supporting gas, a high-temperature flame of 2500 ° C. or more can be obtained. A complete melting process including metals can be performed. Moreover, when compared on a complete melting treatment basis,
Economical operation can be performed as compared with a conventional plasma method or the like.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of an incineration ash melting device of the present invention.

FIG. 2 is a schematic sectional view showing another embodiment of the melting furnace.

FIG. 3 is a schematic sectional view showing still another embodiment of the melting furnace.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Thermal spray burner, 2 ... Melting furnace, 3 ... Fuel supply path, 4
... combustible gas supply path, 5 ... incineration ash supply path, 6 ... molten ash outlet, 7 ... exhaust gas path, 8 ... heat exchanger

Continuation of the front page (56) References JP-A-2-298714 (JP, A) JP-A-3-504463 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23J 1 / 00-1/02 F23G 7/00 F23G 5/00

Claims (3)

(57) [Claims] 1. A device for melt processing in a melting furnace the ash generated from the incinerator, the melting furnace, at least one spray burners using oxygen or oxygen-enriched gas and combustion-supporting gas, the furnace wall To be able to project a flame on
The incinerated ash melting device, characterized in that at least a portion of the ash is provided a path to be introduced into the flame of the thermal spray burner. 2. An apparatus for preheating the combustion-supporting gas in an exhaust gas path of the melting furnace.
The incinerated ash melting device as described. 3. A configuration in which the incinerated ash is conveyed by a carrier gas and injected into the flame of the thermal spray burner.
The incineration ash melting device according to claim 1, wherein a device for preheating the carrier gas is provided in an exhaust gas path of the melting furnace.