JPS6150209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention deals with the treatment of municipal waste, industrial waste, etc. (hereinafter referred to as
The residue or ash (hereinafter sometimes simply referred to as ash) discharged from the incineration treatment equipment (hereinafter simply referred to as "waste") is melted at a high temperature obtained from the combustibles in the ash and other auxiliary fuels. It is about the method.

Traditionally, incineration residue discharged from waste incinerators has been disposed of directly in landfills, but problems such as the difficulty of securing landfill sites and the elution of heavy metals from the ash are becoming a problem. In order to solve these problems, an effective method is to melt the ash.
As a result of extensive research into the melting of ash, the present inventors have developed a method for melting ash efficiently and at low cost.

In the present invention, the residue discharged from a waste incinerator (residue with an appropriate amount of unburned materials left) is introduced as it is, or after removing noncombustible materials such as metals, the residue is guided to a melting treatment device, and the molten By burning the auxiliary fuel in the chemical processing equipment and burning the combustibles in the residue to melt the residue, it is possible to efficiently and continuously melt and process ash with a small amount of auxiliary fuel. The present invention aims to provide a method for melting and treating ash associated with waste incineration.

That is, the method for melting ash associated with waste incineration processing of the present invention controls combustion so that combustibles remain in the residue discharged from the waste incinerator, guides this residue to the melting treatment device, It is characterized in that the auxiliary fuel is combusted within this melting treatment apparatus, and combustible substances in the residue are combusted to melt the residue.

Hereinafter, the configuration of the present invention will be explained based on embodiments shown in the drawings. FIG. 1 shows an example of an apparatus for carrying out the method of the invention. Reference numeral 1 denotes an apparatus main body, and this apparatus main body 1 has a hot water bath 2 inside. A waste incineration residue input port 3 is provided at the upper end of one end of the device main body 1.
A burner 4 for auxiliary fuel combustion is provided on the other end side surface of the device main body 1. In front of this auxiliary fuel combustion burner 4, a melting wall 5 is formed which slopes from the waste incineration residue inlet 3 to the hot water bath 2. In addition, a hot water outlet 6 is provided in the middle part of the side wall of the hot water bath 2, preferably slightly below the central part of the side wall, so that a liquid residue 7 (hereinafter referred to as slag 7) accumulated in the hot water bath 2 can be removed.
It is structured so that when it reaches a certain level (sometimes referred to as 8 is an exhaust gas duct connected between the inlet 3 and the melting wall 5. A combustion air preheater 10 is provided in the exhaust gas duct 8, and is configured to preheat combustion air using high-temperature exhaust gas and supply it to the auxiliary fuel combustion burner 4, thereby reducing the amount of auxiliary fuel used. are doing.

As shown in FIG. 2, the hot water outlet 6 may be provided on the side wall to which the burner 4 is attached, or the inlet 3 may be provided in the middle of the exhaust gas duct 8. Furthermore, as shown in FIG. 3, a partition wall 11 is arranged in the center of the apparatus main body 1, one end of this partition wall 11 is fixed to the upper side wall of the burner 4, and the other end of the partition wall 11 is connected to the melting wall. In some cases, an exhaust gas passage 12 is formed between the partition wall 11 and the exhaust gas duct 8 provided above the partition wall 11. In this case, since high-temperature exhaust gas does not flow into the inlet 3, there is an advantage that the operation of injecting the incineration residue becomes easier.

4 to 6 show other examples of the spout. The hot water outlet 6 shown in FIGS. 1 to 3 is provided at the middle part of the side wall of the device body 1, but the hot water outlet shown in FIGS. 4 to 6 is located approximately at the center of the device body 1. The flame 1 of the burner 4 for auxiliary fuel combustion is provided at
3, the slag 7 can be directly heated, the slag 7 can be prevented from being cooled, and the slag 7 can be continuously discharged. That is, as shown in FIGS. 4 and 5, a notch 14 for removing liquid residue is bored in the bottom wall of the hot water bath 2, and a box with a U-shaped cross section is opened at the top and bottom ends of the notch 14. The box-shaped tapping member 15 is fitted so that the upper end of the box-shaped tapping member protrudes into the inside of the apparatus main body, and a liquid is poured into the upper end opening of the box-shaped tapping member 15 near the center of the apparatus main body. A notch 16 for draining the residue is provided so that the slag 7 around the notch 16 is constantly heated by the flame 13 of the burner 4 and is easily discharged continuously. Note that instead of forming the notch 14 as the opening for removing liquid residue as described above, a hole 17 for removing liquid residue is formed as shown in FIG. 6, and a box-shaped tap member is inserted into this hole 17. In some cases, the cylindrical body 18 is fitted and attached. Note that the shapes of the hole 17 and the cylindrical body 18 are not limited to those shown in the drawings, and other shapes such as a circular hole or a cylindrical body may be used.

Next, an example of a state in which the apparatus configured as described above is connected to a waste incinerator will be explained based on FIG. 7. 20 is a waste incinerator, 21 is a melting treatment device of the present invention, and 22 is a communication duct that connects both. This example shows a case where the residue 23 of the incinerator 20 is directly introduced into the melting treatment device 21. There is.
Most of the heat of melting the residue 23 is provided by the burner 4. The main body of the melting treatment device 21 is provided with a melting wall 5, a reflecting wall 24, and a hot water bath 2, and while the charged residue 23 moves downward along the melting wall 5, it is converted into gas or oil by a burner 4. The heat generated by auxiliary combustion of the incinerator leaves combustible materials in the residue from the incinerator, and the combustible materials are melted by the heat generated by combustion. Note that heat generated by combustion of waste separately inputted into the melting treatment apparatus 21 by the waste inputting apparatus 25 may be used.
Separate combustion of waste and combustion of combustibles in the residue may also be used together. The molten material is stored in a liquid state in a lower hot water bath 2. A reflecting wall 24 provided on the opposite side of the melting wall 5 is configured to prevent the residue 2 on the melting wall from being removed.
This is to increase the heating to 3. When the slag 7 exceeds a certain level, the slag 7 naturally and continuously flows out of the apparatus from the spout 6 or the residue outflow notch. Note that if the melting treatment equipment is small and the spout 6 is provided in the middle of the side wall as shown in Figures 1 to 3, the slag hardens and is difficult to flow out due to large heat dissipation. Therefore, a burner for heating the slag may be separately provided around the spout 6.
In addition, in the case of the apparatus shown in FIGS. 4 to 6, there is no need to install a burner for heating the slag. The combustion temperature within the melting treatment device 21 is approximately 1300 to 1500°C,
The residue is set so that it is sufficiently liquid. Combustion gas is sent to the incinerator 20 through the communication duct 22, but during this time, cooling air is introduced from the communication duct 22 or the cooling air nozzle 26 provided at the outlet of the melting treatment device 21 to generate 800 to 1000
cooled to ℃. A combustion air preheater 27 is provided in the exhaust gas duct of the incinerator 20, and is configured to preheat combustion air using high-temperature exhaust gas and supply it to the burner 4, thereby reducing the amount of auxiliary fuel used. 28 is a dust collector such as an electrostatic precipitator connected to the exhaust gas duct or a dry filter dust collector having a layer of granular filter material such as sand, gravel, or ceramics, and the ash discharged from the dust collector 28 is The ash is introduced into the waste input device 25 through the ash extraction pipe 30 and is processed together with the waste.

Furthermore, the melting treatment apparatus of the present invention can also be used for melting the residue of an existing incinerator. In this case, the existing incinerator may be modified and used in combination as shown in Figure 7, but in general, the melting treatment equipment is installed separately, and a conveyor or similar device is installed between the incinerator and the melting treatment equipment. Connect and use.

Since the present invention is configured as described above, the incineration residue can be easily melted and discharged automatically and continuously, and the combustible material can be burned while leaving the combustible material in the residue. This has the effect of reducing the amount of auxiliary fuel used.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing an example of an apparatus for implementing the method of the present invention, FIG. 2 is a cross-sectional explanatory diagram showing another example of an apparatus for implementing the method of the present invention, and FIG. FIG. 4 is a cross-sectional explanatory diagram showing still another example of the apparatus for carrying out the method of the present invention, FIG. -A sectional view, FIG. 6 is another example of the AA line sectional view in FIG. 4, and FIG. 7 is an explanatory diagram showing an example of the method of the present invention. 1... Apparatus body, 2... Hot water bath, 3... Waste incineration residue inlet, 4... Burner for auxiliary fuel combustion, 5... Melting wall,
6... Hot water outlet, 7... Liquid residue (slag), 8...
Exhaust gas duct, 10... Combustion air preheater, 13...
Flame, 14... Notch for removing liquid residue, 15...
Box-shaped tapping member, 16... Notch for liquid residue outflow, 17... Hole for liquid residue extraction, 18... Cylindrical body, 20... Waste incinerator, 21... Melting treatment device, 22... Communication duct, 23... Residue, 24... Reflective wall, 25... Waste input device, 27... Combustion air preheater, 28... Dust collector, 30... Ash extraction pipe.

Claims (1)

[Claims] 1 Combustion is controlled so that combustible materials remain in the residue discharged from the waste incinerator, this residue is led to the melting treatment equipment, the auxiliary fuel is burned in this melting treatment equipment, and the combustible materials in the residue are A method for melting ash associated with waste incineration processing, characterized by burning combustible materials and melting the residue.