JP2001153339A - Method of disposing of substances polluted by dioxine or the like and cleaning inner side of stack shaft and flue, and apparatus for cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of disposing of substances polluted by dioxine or the like wherein heating requirements necessary for disposing of dioxine are easily established and workability is improved. SOLUTION: The method comprises the steps of mixing an organic solvent with ash (a poluted substance), generated from an incineration 1, in an organic solvent mixing means 3, thereby transferring the dioxine or the like adsorbed in the ash into the organic solvent side, and then, incinerating both the organic solvent and the ash in an incinerating means 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating dioxin contaminants, and more particularly, to a method for treating chimneys and chimneys contaminated with dioxins which is suitable for use before dismantling. The present invention relates to a cleaning method and an apparatus.

[0002]

2. Description of the Related Art As is well known, various high-temperature treatment apparatuses such as a method using a rotary kiln, a fluidized-bed furnace, and a stoker furnace are used for the decomposition treatment of dioxin contaminants according to the form of the contaminants. There are methods. In the combustion / decomposition treatment, it is necessary to keep the contaminants charged into the furnace at a temperature of 800 ° C. or more for 2 seconds or more and to cool them rapidly.

[0003]

In order to realize such heating conditions, large-scale equipment is required, and the operating costs such as electricity costs are increased. In addition, when treating dry solid contaminants, it generally depends on the size and surface shape of the solids, but since dioxins are strongly adsorbed on the surface, the temperature is raised to the indicated temperature and sufficient. It is difficult to burn all contaminants in an oxidizing atmosphere. In addition, dust may be scattered during the operation, and it is extremely difficult to close the area to be handled and to ensure the safety of workers.

[0004] In view of such circumstances, the present invention provides a method for treating dioxin contaminants, which can easily and reliably create the heat conditions required for dioxins and has good workability. As an issue.

[0005] Further, using this treatment method, dioxin contaminants accumulated in smoke exhaust facilities such as chimneys and flue can be easily and safely cleaned, and thereby, when the chimney / flue is dismantled. Another object is to provide a technique capable of facilitating heat treatment of dioxin contaminants.

[0006]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The method for treating dioxin contaminants according to claim 1, wherein the organic solvent is mixed with the contaminants contaminated by dioxin, and the dioxins adsorbed on the contaminants are transferred to the organic solvent side, And burning the contaminants.

[0007] Due to such a constitution, the dioxins can be transferred to an organic solvent having a calorific value by itself and burned without directly heating and decomposing the dioxins, and the heat required for the decomposition of the dioxins can be obtained. It becomes easier to form conditions.

A method for treating dioxin contaminants according to claim 2 is the method for treating dioxin contaminants according to claim 1, wherein the organic solvent is mixed with the contaminants beforehand. And a hydrophilic organic solvent.

[0009] With such a configuration, when the dioxin contaminants are moist, transfer of the dioxins to the organic solvent side can be facilitated.

According to a third aspect of the present invention, there is provided a method for cleaning the inside of a chimney / flue, wherein the entrance and the exit of the chimney / flue are closed. A closed space is formed in the closed space, and a flammable organic solvent is sprayed on the contaminant deposited in the chimney / flue in the closed space, and dioxins adsorbed on the contaminant are removed from the flammable organic solvent. Side, and thereafter, the flammable organic solvent is recovered and incinerated.

[0011] With such a configuration, dioxins can be removed from a chimney or the like in which dioxin contaminants are accumulated without a cutting operation.

According to a fourth aspect of the present invention, there is provided a method for cleaning the inside of a chimney / flue, comprising:
After collecting the organic solvent, the organic solvent remaining in the closed space is further collected while reducing the pressure in the closed space, and the collected organic solvent is treated.

With this configuration, the organic solvent from which dioxins have been eluted can be reliably collected by utilizing the tightness of the chimney / flue.

According to a fifth aspect of the present invention, there is provided an apparatus for cleaning the inside of a chimney / flue, which is a device for cleaning the inside of the chimney / flue, wherein one of an inlet and an outlet of the chimney / flue is closed. A jig, a collecting device that closes the other end and can collect liquid in the chimney / flue, and an organic solvent transfer pipe that supplies an organic solvent into the chimney / flue. A spray device for spraying the organic solvent is attached to a distal end portion of the transfer pipe.

With such a configuration, the organic solvent sprayed into the chimney / flue can be safely recovered.

A cleaning device for a chimney / flue according to claim 6 is the cleaning device for a chimney / flue according to claim 5,
The sealing jig is to close the top of the chimney,
The collection device is formed in a funnel shape, and is installed inside a lower part of the chimney, and the spray device is arranged inside a top portion of the chimney.

With this configuration, the organic solvent sprayed at the top of the chimney can be collected at the lower part of the chimney by flowing down the inner peripheral wall of the chimney.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An example of the first embodiment of the present invention will be described below. FIG. 1 is a diagram conceptually showing a configuration in a case where a method for treating dioxin contaminants according to a first embodiment of the present invention is applied to a garbage incineration plant. As shown in FIG. 1, when garbage and the like are incinerated in the incineration plant 1, there is a concern that ash containing a small amount of dioxins may be generated. Therefore, this ash is collected and sent to the dioxin removing means 2 for treatment. Need to be done.

Here, the dioxin removing means 2 comprises an organic solvent mixing means 3 and an incineration means 4. The ash generated in the incineration plant 1 is mixed with the organic solvent in the organic solvent mixing means 3 and stirred, and then sent to the incineration means 4 to be incinerated.

As the organic solvent mixed with the ash in the organic solvent mixing means 2, a fuel such as kerosene or heavy oil is used. Then, in the organic solvent mixing means 2, an organic solvent of 1 to 100% (weight ratio) of the ash is mixed. Since dioxins are considered to be strongly adsorbed on the surface of the ash, by mixing and stirring the organic solvent with the ash, the dioxins adhering to the ash surface move to the organic solvent side.

A rotary kiln, a fluidized-bed furnace, a stoker furnace or the like is preferably used as the combustion means 4 for incinerating the organic solvent into which the ash and dioxins have been transferred.

As described above, dioxins are directly decomposed by heat by transferring dioxins from ash to the organic solvent having a calorific value per se and further incinerating this organic solvent together with the ash. In comparison with the conventional method, the heat conditions required for dioxins can be easily and reliably formed. Thereby, the load on the incineration means 4 can be reduced as compared with the conventional case, and the furnace operating conditions can be moderated. Furthermore, the decomposition efficiency of dioxins can be improved as compared with the related art.

In the first embodiment, the method for treating dioxin contaminants of the present invention is applied to an incineration plant for garbage and the like. However, the present invention is not limited to this, and may be applied to other plants. It is possible.

For example, when contaminants to be incinerated are wet, a hydrophilic organic solvent such as alcohol is added to and mixed with the contaminants, and then fuel such as kerosene or heavy oil is added. Dioxins can be favorably transferred from contaminants to kerosene and heavy oil.

[Second Embodiment] Next, an example of a second embodiment of the present invention will be described. In the second embodiment, the method for treating dioxins of the first embodiment is used for cleaning the inside of a chimney.

FIG. 2 shows a schematic configuration of the cleaning device 6 applied to the chimney 5. The cleaning device 6 includes a sealing jig 7 for sealing the top 5 a of the chimney 5, a collection device 8 that is disposed inside the lower portion 5 b of the chimney 5, and is formed in a funnel shape. Inside, lower part 5b to top part 5a
And an organic solvent transfer pipe 9 arranged so as to reach.

The organic solvent transfer pipe 9 has a base end 9a
It is connected to a supply pipe 11 for supplying an organic solvent, and has a configuration in which a spray device 12 for spraying the organic solvent is attached to the tip 9b.

The lower end of the collecting device 8 is provided with a collecting device 8.
A collection tube 13 for collecting the organic solvent collected by the above is provided. In the lower part 5b of the chimney 5, a smoke outlet 14 for sending smoke into the chimney 5 is closed by a smoke outlet sealing jig 15. In addition, holes 17 and 18 are provided in the smoke outlet sealing jig 15.
The supply pipe 11 and the recovery pipe 13 are provided with these holes 17, 18 respectively.
Has been inserted.

Next, a method of cleaning the chimney 5 using the cleaning device 6 will be described. First, the organic solvent transfer pipe 9 is arranged inside the chimney 5, and the top 5a of the chimney is sealed by the sealing jig 7. In the lower part 5b of the chimney 5,
In addition to disposing the collecting device 8, the smoke outlet 14 is provided with a smoke outlet sealing jig 15 in which the supply pipe 11 and the recovery pipe 13 are inserted into the holes 17 and 18, respectively. As a result, the inlet and outlet of the chimney 5 are closed, and a closed space S (see FIG. 2) is formed in the chimney 5. At this time, the supply pipe 11 is connected to the organic solvent transfer pipe 9 and the recovery pipe 1 is connected.
3 is connected to the collecting device 8 in advance.

After the cleaning device 6 is arranged in this way, the organic solvent is supplied from the supply pipe 11 to the organic solvent transfer pipe 9. As a result, the organic solvent is sprayed from the spray device 12 provided at the tip 9 b of the organic solvent transfer pipe 9 toward the inside of the chimney 5. In this case, as the organic solvent, those containing an aromatic compound which is flammable and has high solubility of dioxins are preferably used.

The organic solvent sprayed into the chimney 5 flows down the inner peripheral wall of the chimney 5 and reaches the collection device 8 where it is collected. At this time, dioxins deposited on the inner peripheral wall of the chimney 5 can be eluted to the organic solvent side, and dioxins can be recovered by the organic solvent.

The organic solvent containing dioxins collected by the collecting device 8 is discharged through a collecting pipe 13, transferred to a closed vessel (not shown), and collected by redistillation, or , Incinerated. The organic solvent remaining in the closed space S is collected under reduced pressure and is incinerated. Then, after confirming removal of the residual organic solvent in the chimney 5, the sealing jig 7 is removed.

The above-described chimney 5 cleaning method and cleaning device 6
In this case, it is possible to remove a considerable amount of dioxins from the chimney 5 in which dioxin contaminants are accumulated, without cutting work. Thereby, the dismantling and repair work of the chimney can be facilitated.

Conventionally, when dismantling and repairing a chimney, it is necessary to detoxify dioxins accumulated inside the chimney and landfill it. Clean and clean the interior as dioxins may be mixed into the smoke and leak to the outside.
It needed to be repaired. Generally, inside the chimney etc., asbestos or bricks etc. for improving heat resistance are arranged, but dioxins accumulated in this part are:
Conventionally, a part of the lining has been removed by cutting or the like. However, there is a possibility that dioxins volatilize due to generation of dust due to cutting and contaminate the surroundings,
Dioxins volatilize due to heat generated during cutting,
There is a possibility that the surroundings may be contaminated, and when spraying water to prevent scattering of dust generated during cutting, sludge and water may leak to the outside and contaminate the surroundings, etc. There was a problem.

However, according to the method for cleaning the chimney 5 and the cleaning apparatus 6 of the present embodiment, as described above, dioxins inside the chimney 5 can be removed without cutting work. In particular, by using it as a treatment before the chimney 5 is dismantled, when cutting and removing the lining inside the chimney 5, it is possible to reduce the concern that the surroundings of the chimney 5 are contaminated by dioxins as compared with the related art. In this case, it is possible to ensure the safety of the worker at this time. In this case, in order to treat dioxins adhered to the cut lining material, the method of the first embodiment can be suitably used.

Further, in the above-described method for cleaning the chimney 5, the organic solvent remaining in the closed space S is collected while the organic solvent is recovered by the collecting device 8 while the pressure in the closed space S is reduced. Since the collection and treatment are performed, the organic solvent from which dioxins have been eluted can be reliably collected by utilizing the hermeticity of the chimney 5, and the safety is high.

In the above-described cleaning device 6 for the chimney 5, the top 5 a of the chimney 5 is closed by the sealing jig 7, and the inner peripheral wall of the chimney 5 flows down by the collection device 8 formed in a funnel shape. Since the organic solvent is collected, dioxins can be collected with a simple configuration using the hermeticity of the chimney 5.

In the above embodiment, another configuration may be adopted without departing from the spirit of the present invention. For example, the above-described embodiment is an example in which the chimney 5 is cleaned. Instead, when cleaning other smoke exhaust equipment such as a flue, a method similar to the above-described embodiment is employed. You may make it.

[0039]

As described above, in the method for treating dioxin contaminants according to the first aspect, dioxins adsorbed on the contaminants are transferred to the organic solvent having a calorific value by itself. Furthermore, since the contaminants are burned together with the organic solvent, the heat conditions required for dioxins can be easily and reliably formed as compared with the conventional method of directly decomposing dioxins by heating. As a result, the load on the combustion furnace and the like can be reduced, and furnace operating conditions can be moderated, as compared with the related art. Furthermore, the decomposition efficiency of dioxins can be improved as compared with the related art.

In the method for treating dioxin contaminants according to claim 2, the hydrophilic organic solvent is added to and mixed with the contaminants, and the organic solvent is further mixed. In this case, dioxins can be favorably transferred to the organic solvent.

In the method for cleaning the chimney and the flue according to the third aspect and the apparatus for cleaning the chimney and the flue according to the fifth aspect, a chimney or the like in which dioxin-type contaminants are accumulated therein without cutting work. , A considerable amount of dioxins can be removed. Therefore, by using it as a treatment before the chimney / flue is dismantled, it is possible to reduce the risk of dioxins contaminating the surroundings of the chimney / flue when cutting or removing contaminated parts in the chimney / flue. In addition, it is possible to ensure the safety of workers.

In the method for cleaning a chimney / flue according to a fourth aspect, after the organic solvent is collected by the collecting device, the organic solvent remaining in the closed space is further captured while reducing the pressure in the closed space. Since it is collected and treated, the organic solvent from which dioxins are eluted can be reliably collected by utilizing the hermeticity of the chimney, and the safety is high.

In the apparatus for cleaning a chimney / flue according to a sixth aspect, the top of the chimney is closed by a sealing jig, and the organic solvent flowing down the inner peripheral wall of the chimney is collected by a funnel-shaped collector. Because I tried to collect,
Dioxins can be collected with a simple configuration by utilizing the tightness of the chimney.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a first embodiment of the present invention, and is a connection diagram illustrating a schematic configuration of a method for treating dioxin contaminants.

FIG. 2 is a view schematically showing a second embodiment of the present invention, and is an elevational view of a chimney cleaning apparatus.

[Explanation of symbols]

 Reference Signs List 5 chimney 5a top 5b lower 6 cleaning device 7 sealing jig 8 collecting device 9 organic solvent transfer pipe 9b tip 12 spraying device

Continued on the front page (72) Inventor Masato Kawaguchi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Takeo 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F term (reference) 3K061 RA02 RC02 4D004 AA16 AB07 AC07 BB10 CA34 CA40 CA41 CB04 CB42 CC04 CC15

Claims (6)

[Claims] An organic solvent is mixed with contaminants contaminated by dioxin, dioxins adsorbed on the contaminants are transferred to the organic solvent side, and the organic solvent and the contaminants are burned. A method for treating dioxin contaminants, comprising: 2. The method for treating dioxin contaminants according to claim 1, wherein, when mixing the organic solvent with the contaminants, a hydrophilic organic solvent is mixed with the contaminants in advance. For treating dioxin contaminants. 3. A method for cleaning the inside of a chimney / flue, comprising closing an inlet and an outlet of the chimney / flue to form a closed space in the chimney / flue. ,
An organic solvent is sprayed on the contaminants deposited in the chimney / flue, and dioxins adsorbed on the contaminants are transferred to the organic solvent, and thereafter, the flammable organic solvent is recovered and treated. Cleaning method for chimneys and chimneys. 4. The method for cleaning a chimney / flue according to claim 3, wherein after collecting the organic solvent, the organic solvent remaining in the closed space is further depressurized in the closed space. A method for cleaning chimneys and flues, comprising collecting the organic solvent while treating the collected organic solvent. 5. An apparatus for cleaning the inside of a chimney / flue, comprising: a sealing jig for closing one of an inlet and an outlet of the chimney / flue; A collecting device capable of collecting liquid in the chimney / flue, and an organic solvent transfer pipe for supplying an organic solvent into the chimney / flue; A cleaning device for a chimney / flue, which is provided with a spraying device for spraying. 6. The cleaning device for a chimney / flue according to claim 5, wherein the sealing jig closes a top of the chimney, and the collection device is formed in a funnel shape. A spray device installed inside a lower portion of the chimney, wherein the spray device is arranged inside a top portion of the chimney.