JPH07190328A - Incinerated ash melting apparatus - Google Patents

Abstract

PURPOSE:To efficiently melt fine powder incinerated ash by providing a melting burner for oxygen or oxygen enriched gas as self-sustained combustible gas in a melting furnace, and providing a route for charging part of incinerated ash into a flame of a flame spraying burner. CONSTITUTION:A self-sustained combustible gas supply route 4 is formed of an oxygen supply facility 41 and a heat exchanger 8. Self-sustained combustible gas to be supply from the facility 41, i.e., oxygen gas or oxygen enriched gas is heat exchanged with exhaust gas by the exchanger 8, raised at its temperature, and then supplied to a flame spraying burner 1. Fine powder incinerated ash to be supplied from a feeder 51 is raised at its pressure by a compressor 52 is accompanied with conveying gas heat exchanged with the exhaust gas by the exchanger 8 and raised at its pressure, and supplied to the burner 1. The fine ash supplied from an incineration supply route 5 to the burner 1 and charged into the flame is melted to be softened in the flame, and adhered to a furnace wall 21 of a front surface of the burner 1. The fine ash not melted in the flame is collected by melted ash adhered to the wall 21, and melted thereat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incinerator ash melting apparatus, and more particularly to incinerator ash generated by incinerating municipal waste, sewage sludge and other wastes in an incinerator, particularly incinerated ash in a fine powder state. The present invention relates to an apparatus for melt processing.

[0002]

2. Description of the Related Art In recent years, incineration ash generated by incinerating municipal waste, sewage sludge, and other waste materials has been increasing, and it has become difficult to secure landfill sites. For this reason, the incineration ash is being made pollution-free, volume-reduced, and made into resources by melting.

In particular, incinerator ash in the form of fine powder (fine powder incinerated ash) collected in an electric dust collector or the like provided in an incinerator often contains heavy metal particles, and therefore, in order to eliminate pollution. Is also required to be melt-processed. As a method of melting such fine powder incineration ash, an arc furnace method,
The oil burner method and the plasma method have been put to practical use.

[0004]

However, since the above fine powder incineration ash is fine powder and easily re-dispersed when charged into the melting furnace, and the deposit of fine powder has low thermal conductivity,
The heating from the surface is inefficient and the melting process is difficult.

The arc furnace method, which is a conventional treatment method, is difficult to operate because the water content in the incinerated ash is strict, and the surface burner is practically used in the oil burner method. It is difficult to completely melt metals such as empty cans inside. Furthermore, although the plasma method can completely melt incineration ash including metal components, it requires an electric power of 800 kWh or more per 1 t of incineration ash, and normally, the electric power generated by waste power generation is used. Now that the environment for external sales is being improved, there are economic problems.

Therefore, an object of the present invention is to provide an incineration ash melting apparatus capable of efficiently melting and processing fine powder incineration ash that has been difficult to process by re-scattering.

[0007]

In order to achieve the above-mentioned object, the incinerator ash melting apparatus of the present invention is an apparatus for melting and treating incinerator ash generated from an incinerator in a melting furnace. At least one thermal spray burner using oxygen-enriched gas as a combustion-supporting gas is provided, and at least a part of the incineration ash is provided in the flame of the thermal spray burner.

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

The means for supplying the incineration ash into the flame of the thermal spray burner may be a carrier gas, or may be directly supplied to the burner by a screw feeder or the like. Further, the fuel of 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 put into the flame of the thermal spray burner is melted and softened in the flame of the thermal spray burner, adheres to the furnace wall in front of the thermal spray burner, and then flows downstream and is discharged. Further, since the molten incinerated ash (molten ash) is attached 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, by preheating the oxygen or oxygen-enriched gas supplied to the thermal spray burner or the gas carrying fine dust incineration ash with the thermal energy of the exhaust gas from the melting furnace, the thermal spray burner generates the gas. The flame temperature can be increased and the incineration ash melt processing capability can be improved.

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

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail based on an embodiment shown in the drawings. The incinerator ash melting apparatus shown in FIG. 1 includes a melting furnace 2 having a thermal spray burner 1 for melting the incinerated ash, and a fuel for supplying the fuel, the combustion-supporting gas, and the fine powder incinerator ash to the thermal spray burner 1, respectively. Supply path 3,
A combustion-supporting gas supply path 4 and an incineration ash supply path 5, a molten ash outlet 6 for taking out incineration ash (molten ash, molten slag) melted in the melting furnace 2, and a combustion gas generated in the melting furnace 2 are discharged. And an exhaust gas passage 7 for

The thermal spray burner 1 has a furnace wall 2 on its front surface.
1 is installed in the melting furnace 2 so as to face each other, and the furnace wall 21 is formed so that the molten ash attached to the furnace wall 21 part naturally flows down toward the molten ash outlet 6 at the lower part of the furnace. .

When a liquid fuel (heavy oil or the like) is used, the fuel supply path 3 is a fuel storage tank 31 as shown in the figure.
And a fuel pump 32. When other gas fuels or solid fuels are used, they are formed in the optimum configurations.

The combustion-supporting gas supply path 4 is composed of an oxygen supply equipment 41 and a heat exchanger 8. The combustion-supporting gas supplied from the oxygen supply equipment 41, that is, oxygen gas or oxygen enrichment. The gas exchanges heat with the exhaust gas in the heat exchanger 8 to raise the temperature and then is supplied to the thermal spray burner 1.

The incineration ash supply path 5 is provided with a feeder 51 for quantitatively supplying fine powder incineration ash, and a compressor 52 for supplying air serving as a carrier gas for conveying the incineration ash, from the feeder 51. The fine powder incineration ash supplied is
The pressure is increased by the compressor 52, the heat exchanger 8 exchanges heat with the exhaust gas, the temperature of the carrier gas is raised, and the carrier gas is supplied to the thermal spray burner 1.

The fuel supplied from the fuel supply path 3 to the thermal spray burner 1 mixes with the combustion-supporting gas supplied from the combustion-supporting gas supply path 4 and burns to generate a high-temperature flame. Then, the fine powder incineration ash supplied to the thermal spray burner 1 from the incineration ash supply path 5 and charged into the flame is melted and softened 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 entrained in the flame, is projected onto the furnace wall 21, is captured by the molten ash adhering 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 take-out port 6 at the bottom of the furnace, and is crushed by an appropriate means to be an aggregate. Used as etc. The gas generated in the furnace is discharged from the exhaust gas passage 7.

The exhaust gas path 7 is provided with a dust collector 71 and an exhaust fan 72.
And air inlets 73 and 74 for adjusting the exhaust gas temperature as necessary, 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 of all an air intake port 7
3 is mixed with the air taken in through the damper 73a for adjusting the flow rate, and is introduced into the heat exchanger 8 at a predetermined temperature, for example, a temperature that the heat exchanger 8 can withstand, and the combustion-supporting gas and the carrier gas are conveyed. Raise the temperature of the gas.

The exhaust gas discharged from the heat exchanger 8 is further mixed with the air sucked from the air suction port 74 through the damper 74a for adjusting the flow rate, and the temperature becomes lower than the heat resistant temperature of the dust collector 71. After the fine powder that has been introduced into the device 71 and is entrained in the exhaust gas is separated, it is discharged from the air blower 72. The fine powder collected by the dust collector 71 may be supplied to the thermal spraying burner 1 again to be melted.
Since it is a spherical product once melted, it can be effectively used as it is.

Further, massive 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 a usual means, and the thermal spray burner 1 or a separately provided melting burner (see FIG. It can be heated and melted by (not shown).

The shape of the melting furnace 2 is not limited to the above-mentioned embodiment, and for example, as shown in FIG. 2, one side of the incineration ash melting section 22 equipped with the thermal spray burner 1 is vertically moved. A passage 23 may be provided, an exhaust gas outlet port may be provided above the passage 23, and a molten ash extraction port may be provided below the passage 23. As shown in FIG. 3, the exhaust gas outlet port may be provided above and the molten ash removal port may be provided below. Vertical passage 24 with outlets
The thermal spray burner 1 may be attached so that the flame is projected onto the side wall of the.

Depending on the type of incinerated ash, the flame of the thermal spray burner may be projected so as not to hit the furnace wall, and the molten spherical product may be positively recovered.

[0025]

As described above, since the incinerator ash melting apparatus of the present invention is configured so that at least a part of the incinerated ash is thrown into the flame of the thermal spray burner, it is conventionally treated by re-scattering. The fine powder incineration ash, which was difficult, can be efficiently melt-processed. Also, since the scattered particles are molten spherical products, they can be used effectively as they are, and depending on the type of incineration ash, the thermal spray burner is projected so as not to hit the wall surface, and the molten spherical products are positively used. It can also be collected.

Furthermore, since the incinerator ash melting apparatus of the present invention uses the thermal spraying burner which uses oxygen or oxygen-enriched gas as a combustion-supporting gas, it is possible to obtain a flame at a high temperature of 2500 ° C. or higher, It is possible to perform a complete melting process including metals. Moreover, when compared on the basis of perfect melting processing,
Economical operation can be performed as compared with the conventional plasma method and the like.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of an incinerator ash melting apparatus 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]

1 ... Thermal spray burner, 2 ... Melting furnace, 3 ... Fuel supply path, 4
... combustion-supporting gas supply path, 5 ... incineration ash supply path, 6 ... molten ash outlet, 7 ... exhaust gas path, 8 ... heat exchanger

Claims (3)

[Claims] 1. An apparatus for melting and treating incineration ash generated from an incinerator in a melting furnace, wherein the melting furnace is provided with at least one spraying burner using oxygen or an oxygen-enriched gas as a combustion-supporting gas, and An incinerator ash melting apparatus, characterized in that a path for introducing at least a part of the incinerated ash into the flame of the thermal spray burner is provided. 2. A device for preheating the combustion-supporting gas is provided in an exhaust gas passage of the melting furnace.
The incineration ash melting apparatus described. 3. The incineration ash is carried by a carrier gas and is introduced into the flame of the thermal spray burner.
The incinerator ash melting apparatus according to claim 1, wherein a device for preheating the carrier gas is provided in an exhaust gas passage of the melting furnace.