JP2002061825A - Equipment for melt treatment of ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide equipment for melt-treatment of ash, in which ash containing unburned carbon can be melt-treated, and the unburned carbon in the ash can be easily taken out as a combustible gas. SOLUTION: The equipment is provided with a melting furnace 1, an ash- supply means 7 for carrying ash containing unburned carbon into the furnace 1, a heating means 5 for heating the inside of the melting furnace, a means 13 for taking out slag 29 from the furnace 1, a water-vapor supply means 9 for carrying water-vapor into the furnace 1, and a means 11 for taking out combustible gas generated in the furnace 1. The unburned carbon is reacted with H2O to form CO, which becomes an incombustible gas, and H2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash melting treatment apparatus capable of effectively utilizing ash generated when treating general waste or industrial waste.

[0002]

2. Description of the Related Art Conventionally, in a system for treating various kinds of waste such as general waste or industrial waste at a high temperature, ash containing unburned carbon is inevitably generated. Conventionally, these ashes have been subjected to landfill disposal. However, in recent years, it has become necessary to perform a melting treatment from the viewpoint of the tightness of the remaining years of the final disposal site and the prevention of environmental pollution due to dioxin and the like.

[0003] As a method of melting the ash containing unburned carbon, for example, a means described in Japanese Patent Application Laid-Open No. 4-251106 is known.

[0004] This means is characterized in that unburned carbon in the incinerated ash is burned as fuel with fuel air or oxygen, and the ash is melted by the heat generated at this time, thereby stably operating at a low running cost. And

[0005]

The conventional means generates a high calorific value when unburned carbon is burned, which exceeds the energy required for melting the ash and accelerates the damage of the furnace body. Further, since unburned carbon is completely consumed as combustion energy, there is room for improvement in terms of effective energy utilization.

[0006] Therefore, the present invention provides an ash melting treatment apparatus that streamlines the exothermic reaction of unburned carbon so that a flammable gas that can be reused simultaneously with the melting of ash can be extracted as much as possible. The purpose is.

[0007]

According to one aspect of the present invention, there is provided a smelting furnace, ash supply means for feeding ash containing unburned carbon into the smelting furnace, and a smelting furnace. Heating means for heating the inside, slag taking out means for taking out slag in the melting furnace, steam supply means for feeding steam into the melting furnace, and flammable gas taking out means for taking out flammable gas generated in the melting furnace. Have.

As a result, the ash containing unburned carbon is fed into the melting furnace, and the inside of the furnace becomes a steam atmosphere by steam from the steam supply means. On the other hand, the ash in the melting furnace is heated to a predetermined temperature by the heating means,
The slag is melted and becomes slag, which can be taken out from the slag taking out means. At this time, the unburned carbon in the ash reacts with H ₂ O in the furnace by a steam atmosphere to generate CO and H ₂ . The generated CO and H ₂ are extracted by the combustible gas extracting means, and can be reused as fuel.

According to the second aspect of the present invention, the ash containing unburned carbon is waste incineration ash.

As a result, the amount of ash to be disposed can be reduced and the ash can be treated without adversely affecting the environment.

According to the third aspect of the present invention, the ash containing unburned carbon is a residue generated by thermal decomposition of waste.

As a result, the amount of ash to be disposed can be reduced, and the ash can be treated without adversely affecting the environment.

[0013] According to the fourth aspect of the present invention, the ash containing unburned carbon is dust generated by thermal decomposition of waste.

As a result, the amount of ash to be disposed can be reduced, and the ash can be treated without adversely affecting the environment.

According to a fifth aspect of the present invention, the ash containing unburned carbon is dust generated in the process of reforming the pyrolysis gas of waste.

As a result, the amount of ash to be disposed can be reduced, and the ash can be treated without adversely affecting the environment.

According to the sixth aspect of the present invention, the ash containing unburned carbon is used for removing residues generated by thermal decomposition of waste, dust generated by thermal decomposition of waste, and pyrolysis gas of waste. It is a mixture of dust generated during the reforming process.

As a result, the amount of ash to be disposed can be reduced, and the ash can be treated without adversely affecting the environment.

According to the seventh aspect of the present invention, electric power is used as a heat source of the heating means.

As a result, it is possible to use the power generated by the power generation in the processing facility, and the cost can be reduced.

According to the eighth aspect of the present invention, the heat source of the heating means is a solid fuel using unburned carbon in the treated ash.

As a result, fuel costs can be reduced, and
This is very favorable in terms of running costs.

According to the ninth aspect of the present invention, air is used as an oxidizing agent for oxidizing a solid fuel serving as a fuel for the heating means.

Thus, the fuel cost can be reduced.

According to a tenth aspect of the present invention, oxygen-added air is used as an oxidizing agent for oxidizing a solid fuel serving as a fuel for the heating means.

Thus, efficient combustion can be obtained.

According to the eleventh aspect of the present invention, oxygen is used as an oxidizing agent for oxidizing a solid fuel serving as a fuel for the heating means.

As a result, efficient combustion can be obtained.

Further, according to the twelfth aspect of the present invention, the ash melting treatment device constitutes an element of the waste treatment system.

As a result, a consistent flow can be secured from the processing of waste to the removal of combustible gas, and the removal of combustible gas can be performed efficiently.

According to the thirteenth aspect of the present invention, as the air supplied from the steam supply means into the melting furnace, steam generated inevitably in the waste treatment process is used.

As a result, a device for newly generating steam is not required, and the running cost is very favorable.

According to the fourteenth aspect of the present invention, the steam supplied from the steam supply means into the melting furnace uses the process steam used in the waste treatment process.

As a result, a device for newly generating steam is not required, and the running cost is very favorable.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be specifically described with reference to the drawing of FIG.

In FIG. 1, reference numeral 1 denotes a melting furnace of an ash melting treatment device 3 incorporated in a waste treatment system.

The melting furnace 1 has flammable gas extracting means 11 and slag extracting means 13 in addition to the heating means 5, the ash supply means 7 and the steam supply means 9, and the furnace wall of the melting furnace 1 is made of a heat insulating material. The heat insulation structure used. In this case, the furnace wall is
A cooling structure in which water flows inside may be used.

The heating means 5 is a burner device 15 using, for example, carbon monoxide as fuel, so that a high-temperature flame is blown into the melting furnace 1.

In this case, the fuel may be a liquid fuel such as light oil, heavy oil or residual oil, or a fixed fuel such as soot when burning waste. When using the fuel of this embodiment, it is desirable to use an oxidizing agent such as hydrazine.

The steam supply means 9 has a structure in which the steam generated by the steam generator 17 is fed into the melting furnace 1 through a supply pipe 19.

The ash supply means 7 has a structure in which ash containing unburned carbon, for example, waste incineration ash generated in the waste treatment system 21 is fed into the melting furnace 1 by a spiral feeding device 23.

The ash containing unburned carbon is generated in the process of reforming the residue generated by thermal decomposition of waste, the dust generated by thermal decomposition of waste, or the pyrolysis gas of waste. Dust or a combination thereof.

The flammable gas extracting means 11 is configured to extract flammable gas generated in the melting furnace 1 to a storage tank 27 through an extracting pipe 25.

The slag removing means 13 has a structure in which when a certain amount of the molten slag 29 accumulates at the bottom of the melting furnace 1, it overflows and is taken out from the outlet 31.

According to the ash melting apparatus 3 configured as described above, ash containing unburned carbon and steam are fed into the melting furnace 1, and the inside of the melting furnace 1 becomes a steam atmosphere. On the other hand, the ash sent into the melting furnace 1 by the burner device 15 is melted, turned into slag 29 and taken out from the outlet 31. During these operations, the unburned carbon in the ash reacts with H ₂ O in the melting furnace 1 by the steam atmosphere to generate CO and H ₂ .

The produced CO and H ₂ are supplied to the extraction pipe 2
5 and can be temporarily stored in the storage tank 27 and reused as fuel. Further, since the inside of the melting furnace 1 is in a steam atmosphere, there is an advantage that the furnace wall does not become unnecessarily high in temperature and damage to the furnace wall is reduced.

FIG. 2 shows a second embodiment in which electric power is used for the heating means 5.

That is, the electrode 3 made of carbon has its tip facing the slag 29 stored at the bottom in the melting furnace 1.
3 is disposed and serves as means for melting ash by an arc 35 generated between the tip of the electrode 33 and the slag 29 when a direct current flows through the electrode 33.

The other components are the same as those shown in FIG.

Therefore, according to the second embodiment, in addition to the effects of the first embodiment, the waste treatment facility 2
When the in-house power is generated by burning the waste in step 1, the electric energy can be used as electric power, and the fuel cost can be reduced.

FIG. 3 shows a third embodiment suitable for melting ash having a high unburned carbon content.

That is, the heating means 5 is a burner device 37 using ash containing unburned carbon as fuel. Burner device 3
7, an oxidizing agent such as hydrazine and waste incineration ash generated in the waste treatment system 21 are supplied via an oxidizing agent supply pipe 39. The incineration ash is supplied in a spiral form. After being transported by the device 41, the control device 4
3, the supply control of a prescribed amount is performed.

The other components are the same as those shown in FIG.

Therefore, according to the third embodiment, the ash containing unburned carbon is used as fuel for the burner device 37, and the molten ash becomes slag 29 and goes out of the outlet 31. Taken out.

On the other hand, unburned carbon remaining without being consumed reacts with H ₂ O in a steam atmosphere to generate CO and H ₂ .

The produced CO and H ₂ are supplied to the extraction pipe 2
5 and can be temporarily stored in the storage tank 27 and reused as fuel.

In the case of this embodiment, air which does not cost the oxidizing agent may be used. Alternatively, in order to ensure reliable combustion, it is also possible to use a means using air to which oxygen is added or only oxygen.

FIG. 4 shows a fourth embodiment of the ash melting apparatus 3.

That is, the steam supply means 9 utilizes steam which is inevitably generated when the garbage is dried in the waste treatment process of the waste treatment system 45. The steam is supplied through the supply pipe 47 to the melting furnace. It is structured to be fed into the inside of the vehicle.

The other components are the same as those shown in FIG.

Therefore, according to the fourth embodiment, the steam inevitably generated in the waste treatment system 45 is sent into the melting furnace 1 through the supply pipe 47, and the steam in the melting furnace 1 Atmosphere. As a result, the unburned carbon reacts with H ₂ O to generate CO and H _2, and the generated C
O and H ₂ are extracted from the extraction pipe 25, temporarily stored in the storage tank 27, and reused as fuel. In addition,
The molten slag 29 is taken out from the outlet.

In this case, the steam may be process air for cooling with steam in the waste treatment process.

The waste treatment system 45 may be a waste thermal decomposition treatment system for gasifying waste.

[0064]

As described above, according to the ash melting treatment apparatus of the present invention, the unburned carbon in the ash can be easily taken out as a combustible gas by steam, and the ash can be effectively used without waste. Can be achieved. Further, by melting the ash, the amount of the ash to be disposed can be significantly reduced, and the environment is not adversely affected.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an entire ash melting treatment apparatus according to the present invention.

FIG. 2 is a schematic explanatory diagram similar to FIG. 1 showing a second embodiment.

FIG. 3 is a schematic explanatory view similar to FIG. 1 showing a third embodiment.

FIG. 4 is a schematic explanatory diagram similar to FIG. 1 showing a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting furnace 5 Heating means 7 Ash supply means 9 Steam supply means 11 Flammable gas removal means 13 Slag removal means 29 Slag

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23G 5/00 115 F23G 7/00 ZAB 7/00 ZAB 103Z 103 B09B 3/00 303L (72) Inventor Nakajima Ryo 2-4-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Keihin Works Co., Ltd. (72) Inventor Jun Yoshikawa 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Toshiba Keihin Works 3K061 AA18 AB03 AC03 BA10 CA01 DA15 DA17 DB06 DB20 NB03 4D004 AA36 BA02 BA03 CA27 CA29 CB02 CB31 CB34 CB42 CB43 CC01 CC02

Claims (14)

[Claims] 1. A melting furnace, ash supply means for feeding ash containing unburned carbon into the melting furnace, heating means for heating the inside of the melting furnace, slag removing means for removing slag from the melting furnace, and a melting furnace. An ash melting treatment device comprising: a steam supply means for feeding steam into the furnace; and a flammable gas extracting means for extracting flammable gas generated in the melting furnace. 2. The ash melting apparatus according to claim 1, wherein the ash containing unburned carbon is waste incineration ash. 3. The ash melting treatment apparatus according to claim 1, wherein the ash containing unburned carbon is a residue generated by thermal decomposition of waste. 4. The ash melting treatment apparatus according to claim 1, wherein the ash containing unburned carbon is dust generated by thermal decomposition of waste. 5. The ash melting treatment apparatus according to claim 1, wherein the ash containing unburned carbon is dust generated in a process of reforming pyrolysis gas of waste. 6. The ash containing unburned carbon is a mixture of a residue generated by pyrolysis of waste, dust generated by pyrolysis of waste, and dust generated in a process of reforming pyrolysis gas of waste. The ash fusion processing apparatus according to claim 1, wherein 7. The ash melting treatment apparatus according to claim 1, wherein the heating means uses electric power as a heat source. 8. The ash melting treatment apparatus according to claim 1, wherein the heating means is a solid fuel using unburned carbon in the treated ash as a heat source. 9. The ash melting treatment apparatus according to claim 8, wherein the heating means uses air as an oxidizing agent for oxidizing the solid fuel. 10. The ash melting apparatus according to claim 8, wherein the heating means uses air to which oxygen is added as an oxidizing agent for oxidizing the solid fuel. 11. The ash melting treatment apparatus according to claim 8, wherein the heating means uses oxygen as an oxidizing agent for oxidizing the solid fuel. 12. The ash melting treatment apparatus according to claim 1, which constitutes an element of a waste treatment system. 13. The ash melting treatment apparatus according to claim 12, wherein the air supplied from the steam supply means into the melting furnace is steam generated inevitably in a waste treatment process. 14. The ash melting treatment apparatus according to claim 12, wherein the steam supplied from the steam supply means into the melting furnace is a process steam used in a waste treatment process.