JPH11226547A - Method and apparatus for treating halogen-containing substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the exhaust gas and residue which are produced by heating a material to be treated containing halogen substances harmless and to reduce the volume of the residue to be reused. SOLUTION: In a method for treating halogen-containing substances, water adherent to a material to be treated is removed by a drying furnace 10, the material and a treating agent of an alkaline substance are heated in a chloride producing furnace 20 to decompose and deposite halogen substances and simultaneously are reacted with the treating agent to produce harmless chlorides, and the generated gas the residue are made harmless. Next, the material, which was made harmless, is carbonized (converted into ash) by a volume reducing heat treatment furnace 30 to reduce its volume, a carbonized material not containing the halogen substances is taken out to be reused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a halogen (chlorine,
The present invention relates to a treatment method and a treatment apparatus for treating an object to be treated such as waste containing a large amount of bromine and iodine by performing thermal treatment such as thermal decomposition. When the halogen substance (especially chlorine) contained in the object to be treated is decomposed and precipitated after removing the moisture attached to the object, it reacts with the alkali substance and is replaced with harmless chloride to generate harmful substances. Prevent the generation of dioxins,
At the same time, the detoxification of the exhaust gas and the harmful object are aimed at, and in the next step, the volume of the harmless object is reduced by carbonization or incineration in a heat treatment furnace separate from the previous step. The present invention relates to a processing method and apparatus for preventing a halogen substance from reacting and remaining in a residue.

[0002]

2. Description of the Related Art General waste such as municipal waste, industrial waste, shredder dust, vinyl chloride and other wastes contain a large amount of halogen substances (chlorine, bromine, iodine, fluorine, astatine), especially chlorine components. If heat treatment such as incineration is performed, chlorine-based gas (hydrogen chloride,
Chlorine) generates a large amount of gas, generates generated gas (exhaust gas), residue after incineration (processed ash), and produces highly toxic dioxins in fly ash in the exhaust gas, causing problems such as environmental pollution and deterioration of incineration equipment. generate. Therefore, technology for solving these problems has been developed, and the following technology is currently disclosed.

(1) Treatment method by incineration This method involves incinerating an object to be treated such as waste in an incinerator. At the time of incineration, an alkaline substance (lime powder) is sprayed into the incinerator. Then, it is made to react with chlorine-based gas in the exhaust gas generated by incineration to generate harmless chloride (calcium chloride), thereby making the exhaust gas harmless (for example, JP-A-54-93864).

(2) Treatment method by dry distillation (pyrolysis) As this treatment method, pyrolysis is performed using a single rotary processing furnace (rotary kiln), and the discharged residue is incinerated by a later stoker, and pyrolyzed. A method is proposed in which the gas is burned in a reburn chamber, the generated high-temperature gas is passed through a boiler, etc., and then guided to a reaction tower, where the slaked lime slurry is sprayed and reacted with the exhaust gas in the same manner as described above. (For example, JP-A-5-33916).

Further, the waste is heat-treated by a low-temperature carbonization method in a rotary processing furnace to convert it into a low-temperature carbonized gas and a pyrolysis residue, which is burned in a high-temperature combustion furnace to produce a molten liquid slag. There is also proposed a method of cooling and solidifying into a glass state, and treating the generated gas with a boiler, a removal filter and a gas purifying device and discharging the gas (for example, Japanese Patent Application Laid-Open No. H8-86,838).
510789).

As another method, when an object to be treated is heat-treated in a heat treatment furnace, an appropriate amount of an alkaline additive which easily reacts with the chlorine component is mixed and heat-treated to fix the chlorine component in the treated ash. A method has also been proposed in which harmless exhaust gas is obtained by converting the treated ash to a chlorine component by washing with water or the like (JP-A-9-155326).

[0007]

The above-mentioned method based on incineration treatment is a treatment at a place close to the generation source because the alkali substance is sprayed into the incinerator. After processing.

Therefore, according to this method, although the chlorine-based gas removal effect can be expected to some extent, it is difficult to sufficiently satisfy the emission standard values of various gases according to the revised laws and regulations.

[0009] Moreover, because of incineration, the reaction temperature is high, and it is difficult to maintain a stable reaction. Further, spraying a large amount adversely affects the original combustion (generation of unburned phenomena), making it difficult to satisfy the emission standard values of various gases according to laws and regulations.

[0010] Further, in the method based on the dry distillation treatment, the object to be treated is thermally decomposed without burning, so that the instability factor as in an incinerator is easily removed. However, when the alkali substance is sprayed into the heat treatment furnace as in the incinerator, only the same effect as in the case of the incineration treatment can be expected.

In each of the above-mentioned treatment methods, when the exhaust gas contains a large amount of a halogen substance (particularly a chlorine-based gas), corrosion of facilities such as a heat treatment furnace and a flue becomes remarkable, and the durability of the facility becomes poor. This may cause a drop or exhaust gas leakage, which makes maintenance difficult.

In any of the above-described treatment methods, after a chlorine-based gas is once generated from an object to be treated, a chlorine-based gas and dioxins are removed in a subsequent step (by means such as a bag filter or combustion). There is a problem.

In order to solve these problems, the applicant of the present application has proposed to mix an alkaline additive during the heat treatment (Japanese Patent Application Laid-Open No. Hei 9-15532).
6).

In each of the above-mentioned treatment methods by dry distillation, the treatment for thermally decomposing an object to be treated to deposit a decomposition gas is performed in a single treatment furnace. In other words, the process is performed in a series of processes in which an object to be processed is supplied from one supply port of a single processing furnace and carbide is discharged from the other discharge port. In this series of processes,
Heating treatment (for example, 1 hour,
(300 ° C. to 600 ° C.), the processing of drying → pyrolysis → volume reduction (carbonization) of the object is continuously performed.

The temperature at which a halogen substance is thermally decomposed and deposited from an object to be treated is about 200 ° C. to 350 ° C., and the halogen substance decomposed and deposited in a processing furnace, particularly a chlorine-based gas, is easily filled. State. Therefore, there is a possibility of producing dioxins at this point.

Further, the object to be treated is agitated, and the generated chlorine-based gas is easily entrained in the object to be treated. When the object to be treated is heated to a temperature of 350 ° C. or more to form a carbide, Will be adsorbed.

[0017] The carbide, chlorine-based gas,
If the generated dioxins are present at the same time, the carbides will adsorb these chlorine-based gases and dioxins, and it is very difficult to remove the once adsorbed dioxins from the carbides.

[0018] Therefore, it is difficult to reuse the generated carbide, and it is necessary to bury it as a residue in a final disposal site or to process it by another means such as melting at a very high temperature.

Therefore, the problem to be solved by the present invention is to remove the moisture adhering to the object during the decomposition treatment of the object, raise the temperature and decompose and precipitate the halogen substance from the object, The deposited halogen substance (particularly, hydrogen chloride) and the alkaline substance are reliably brought into contact with each other to form harmless chloride, thereby realizing the harmlessness of the exhaust gas and the residue, and removing the harmless residue. Another object of the present invention is to reduce the volume by carbonization or the like in another processing furnace and to enable reuse.

[0020]

As a result of various experiments and studies, the inventor of the present application has found that the heat treatment furnace is a substantially closed space, and that water (H ₂ O) adhering (or contained) to an object to be treated is removed. An environment in which halogen substances (particularly, chlorine, etc.) contained in the object to be removed and resulting from the generation of dioxins are decomposed and precipitated from the object to be treated and then contact-reacted with an alkali substance; It has been found that the above-mentioned problems can be solved by performing the heat treatment furnaces in different environments for the environment in which the volume is reduced (carbonization and incineration).

Further, by adding an alkali substance to the object to be treated and subjecting it to heat treatment, the halogen substance, especially hydrogen chloride, comes into contact with the alkali substance immediately after decomposition and deposition to produce harmless chloride, and It has also been found that the detoxification treatment of exhaust gas and residues can be performed at the source, and the detoxification treatment of exhaust gas containing chlorine-based gas as in the prior art is unnecessary.

The present invention has been made as a result of these experimental studies. The decomposition reaction step includes a step of removing water adhering to the object by heating, and a step of removing the halogen contained in the object. The substance (chlorine, etc.) is decomposed by heating, decomposed and precipitated, and contacted with the added alkaline substance to produce harmless chloride, which is rendered harmless. The treated product is transferred to another heat treatment furnace and heated at a carbonization temperature of 350 ° C. (paper is carbonized at about 350 ° C.) or higher, and carbonized, or heated to 800 ° C. or more and incinerated to reduce the volume. Become

Since the chlorine-based gas component and dioxins do not exist in the heat treatment furnace in this volume reduction step, the carbonized material to be treated is not adsorbed. Therefore,
Detoxification of reduced-volume carbides and ash can be realized and can be reused as resources.

Accordingly, a specific means for solving the problem according to the present invention is a processing method for reducing the volume of an object to be treated by heat-treating the object to be treated containing a halogen substance. Addition of an alkaline substance to the mixture and heating in a heating furnace to decompose and precipitate a halogen substance from the substance to be treated, and make it harmless by contacting with the alkaline substance to produce harmless chlorides, thereby detoxifying the exhaust gas and treating the substance. A decomposition reaction step of performing a detoxification process, and a volume reduction step of reducing the volume of the substance to be treated in the decomposition reaction step by carbonization or the like, wherein the decomposition reaction step removes moisture from the substance to be treated. And a chloride producing step of producing harmless chlorides. Each of these steps is performed in a different heat treatment furnace.

That is, in the decomposition reaction step, the object is dried to remove water, and then in the chloride generation step, an alkali substance is added to the object and heated to 200 ° C. to 350 ° C. The chlorine-based gas decomposed and precipitated from the material is generated and replaced by harmless chloride by contact reaction with the alkaline substances present in the surroundings at the same time as it is generated, which makes the exhaust gas harmless and, at the same time, the object to be treated containing no chlorine-based gas Becomes

The alkaline substance added in the decomposition reaction step is
Alkali metals (Na, K, etc.) and alkaline earth metals (Ca,
Sr, Ba, Ra), alkaline earth metal compounds (lime,
Slaked lime, calcium carbonate, dolomide, etc.). Further, the decomposition reaction step, after passing through the drying step of drying the object,
Move on to chloride generation step.

A processing apparatus for realizing this processing method includes a drying processing furnace for drying an object to be processed and an alkali substance added to the object to be processed to decompose and precipitate a halogen substance from the object to be processed. A chloride production furnace that produces harmless chlorides by contact reaction with an alkali substance, a volume-reduction heat treatment furnace that reduces the volume of an object to be treated processed in this chloride production furnace by carbonization, etc. A duct for guiding the object to be processed is provided between the furnaces, and the drying furnace, the chloride generation furnace, and the volume-reducing heat treatment furnace are provided with a supply port for supplying the object to be processed at one end and an exhaust port at the other end. A cylindrical body having a discharge port, a means for transferring an object to be processed while stirring the inside of the cylindrical body from the supply port side to the discharge port side, and a heating means for heating the cylindrical body from the outside, Connect the outlet of the drying furnace with the supply of the chloride generator. Communicating with extract, and the outlet of chloride generation furnace, communicates the supply port of said volume reduction heat treatment furnace in another duct supplying the treatment object from the supply port of drying furnace,
It is configured to discharge from the outlet of the volume reduction furnace.

The drying furnace, the chloride producing furnace, and the volume-reducing heating furnace are placed side by side in the horizontal direction, and the discharge port of the drying furnace and the supply port of the chloride producing furnace are connected by a duct. The discharge port of the chloride production furnace and the supply port of the volume reduction heat treatment furnace are connected by another duct. By sequentially arranging the objects vertically, the object to be processed is smoothly transferred from the drying furnace to the chloride producing furnace and the volume reducing heating furnace.

When two drying treatment furnaces are used, they are provided above the duct on both sides of the duct.

Further, the drying furnace and the chloride producing furnace are arranged vertically on both sides of the duct, and the chloride producing furnace and the heat treatment furnace for reducing the volume are provided on the same side of the duct.

When communicating in a plane instead of above and below,
A transfer means such as a screw body or a conveyor for transferring an object to be processed into the duct is required.

At least one drying treatment furnace for removing the water, a chloride generation furnace for decomposing and reacting a halogen substance and / or a heat treatment furnace for performing a volume reduction treatment is required, but it is necessary to provide at least one. A plurality of them may be arranged as needed.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. As described above, the present invention provides a decomposition reaction step of decomposing and separating a halogen substance from a processing object and reacting with a processing agent composed of an alkaline substance when the processing target substance containing a halogen substance is subjected to heat treatment. The step of reducing the volume of the object to be treated in the process by carbonization and the like is performed in a different heat treatment furnace, and the decomposition reaction step is a drying step of removing moisture from the object to be treated, The method is characterized in that it is divided into a chloride producing step of producing harmless chloride by reacting with a substance, and these steps are performed in different heat treatment furnaces. FIG. 1 shows a conceptual diagram of a waste treatment facility for explaining the basic idea.

In FIG. 1, reference numeral 10 denotes a drying furnace, and reference numeral 20 denotes a chloride producing furnace. The drying furnace 10 removes water (H ₂ O) from the object to be treated and heats an additive made of an alkaline substance. The harmless chloride is produced by reacting the decomposed halogen substance (particularly chlorine) with the alkali substance. Reference numeral 30 denotes a volume-reduction heat treatment furnace.

The drying furnace 10 includes a rotatable cylindrical body 11.
A heating cylinder 12 for forming a gas duct on the outer periphery of the cylindrical body 11 and introducing a hot gas to heat the cylindrical body 11;
1 is provided at one end of the cylindrical body 11, and is provided with a supply port 13 for supplying an object to be processed into the cylindrical body 11 and a discharge port 14 provided at the other end of the cylindrical body 11. Is rotationally driven by the rotational driving means 15. Rotation driving means 1
5 is a driving motor 15a, a driving gear 15b, and a cylindrical body 11
, And a driven gear 15c provided on the second motor. 16 is supply port 1
A supply side duct surrounding the 3 side, 17 is a discharge side duct surrounding the outlet 14 side, 18 is a heating coil (induction heating or resistor), on the outer periphery of the cylindrical body 11 on both sides of the heating cylinder 12,
It is provided in non-contact and close proximity to the cylindrical body 11 and constitutes a heating means together with the heating cylinder 12.

In the drawing, reference numeral 19 denotes a cylinder for mounting a temperature sensor;
Indicates a dynamic seal.

The basic structure of the chloride producing furnace 20 and the volume-reducing heating processing furnace 30 is the same as that of the drying processing furnace 10.
Therefore, in the same or equivalent part, the next digit of 20 and 30 is set to the same number (for example, cylindrical bodies 11, 21 and 21).
31, heating cylinders 12, 22, 32) Detailed description is omitted.

Reference numeral 40 denotes a hopper, which is a mixture of an object to be treated and a treating agent comprising an alkali substance and throws the mixture into the supply port 13 of the cylindrical body 11 through an opening / closing valve (opening / closing door) 31.
From the cylinder 11. The material to be treated may be any of solid matter such as general waste and industrial waste, ash, and sludge.

The hopper 40 has a crushing function and a function of mixing the processing agent, and may mix the processing agent with the processing agent while crushing the solid material. May be mixed and charged.

The alkaline substance as a treating agent reacts with a halogen substance to form harmless chlorides, such as alkali metals (Na, K, etc.) and alkaline earth metals (Ca, Sr, B
a, Ra), alkaline earth metal compounds (lime, slaked lime,
Calcium carbonate, dolomide, etc.).

The cylindrical body 11 of the drying furnace 10, the cylindrical body 21 of the chloride generating furnace 20, and the cylindrical body 31 of the volume-reducing heating furnace 30 are disposed vertically, and the discharge duct of the cylindrical body 11 is provided. 17 and the supply port 23 of the cylindrical body 21 are communicated via an opening / closing valve (opening / closing door) 42, and the supply of the discharge side duct 27 of the cylindrical body 21 of the chloride producing furnace 20 and the supply of the reduced volume heating processing furnace 30. The opening 33 communicates with the opening 33 via an opening / closing valve 43. The discharge port 34 of the cylindrical body 31 of the volume reduction heat treatment furnace 30 communicates with the melting tank 45 via the discharge side duct 37 and the opening / closing valve 44 to discharge the residue after the volume reduction processing and the reacted processing agent. I do.

Reference numeral 46 denotes a combustion device which burns LNG from the LNG tank 47 to generate hot gas when, for example, LNG is burned. This hot gas is reduced in volume by the heat treatment furnace 3
The heating cylinder 32, the connecting pipe 48, the heating pipe 22 of the chloride producing furnace 20, the connecting pipe 49, and the heating pipe 12 of the drying furnace 10 are fed in this order, and the cylindrical bodies 31, 21, 11 are sequentially heated. After heating these cylinders, the drying means 50 is further heated via the discharge pipe 48 and sent to the exhaust gas combustion means 52 via the pipe 41.

The combustion means 52 sends the gas in the discharge duct 17 of the drying furnace 10, the supply duct 26 of the chloride production furnace 20, and the gas in the discharge duct 37 of the reduced volume heat treatment furnace 30 to the combustion device 46. Then, the gas used in each heating unit is burned and sent to the bag filter 51 in the next step.

In the combustion means 52, the gas is burned to remove the tar component, and the gas is cooled and sent to a temperature lower than the endurable temperature of the bag filter 51.

The bag filter 51 reacts with the treating agent and sends the unreacted treating agent to the hopper 40 for reuse.
The exhaust gas is sent to an exhaust gas combustion unit 53, where the exhaust gas is subjected to combustion processing by LNG or the like, and is discharged from a chimney 54.

Reference numeral 55 denotes a dehydrating means, which solidifies and separates the aqueous solution in the dissolving tank 45, and the solid is dried by the drying means 50.
After being discharged to the carbide hopper 56, the liquid is neutralized with a neutralizing agent or the like by the water treatment means 57, and then returned to the dissolving layer 45 for reuse.

FIG. 2 is a longitudinal sectional view of the cylindrical bodies 11, 21 and 31. The cylindrical bodies have a plurality of blades S therein. The mixture of agents is moved from the supply port side to the discharge port side while stirring. In order to smooth this movement, cylindrical bodies 11 and
1, 31 may be provided with the supply port side inclined slightly higher than the discharge port side.

Next, a series of processing methods will be described.
First, LNG is burned by the combustion device 46 to generate hot gas, which is supplied in the order of the heating cylinders 32, 22 and 12. Further, if necessary, AC power is supplied to the heating coils 18, 28, 38 to heat the cylindrical bodies 31, 21, 11, 11. Next, and / or at the same time, a mixture of the object to be treated containing a halogen substance and the treatment agent composed of an alkali substance is supplied to the cylindrical body 11 of the drying processing furnace 10 from the hopper 40 while mixing.

Here, heating is performed at a temperature of 100 ° C. to 200 ° C. to remove water (H ₂ O) adhering to the object.

The workpiece from which the water has been removed is sent to the chloride producing furnace 20 through the discharge duct 17 and the opening / closing valve 42, and halogen substances (particularly chlorine-based gas) are removed in the chloride producing furnace 20. Decomposition and precipitation temperature of 200 ° C to 35
Heat treatment is performed at 0 ° C. to decompose and precipitate chlorine-based gas and the like from the object. At the time of this precipitation, the chlorine-based gas, etc. reacts with the alkaline substance of the treating agent being added and is replaced and generated with harmless chlorides. Detoxification can be realized.

The object to be treated after the halogen substance is precipitated and made harmless is sent to the cylindrical body 31 of the volume reduction heat treatment furnace 30 through the duct 27 and the opening / closing valve 43, where the object is carbonized. Temperature (paper begins to carbonize at about 350 ° C.) Heat to 350 ° C to 700 ° C to carbonize, or 8
The volume is reduced by heating to 00 ° C. or more by incineration. Since the chlorine-based gas components and dioxins do not exist in the volume-reducing heat treatment furnace 30 in this volume-reducing step, these chlorine-based gases and dioxins are adsorbed on the carbonized or incinerated workpiece. Never.

The reduced volume of the object to be treated and the treated agent are reacted via a duct 37 and an opening / closing valve 44 with a dissolving tank 45.
Is discharged into In the dissolution tank 45, the reduced volume of the object to be treated, the treated agent after the reaction, and the like are dissolved in water, which is separated into a solid and a liquid by a dehydrating means 55, and the solid is dried by a drying means. After drying at 50, the liquid is taken out from the carbide hopper 56, while the liquid is recovered by treating the treated agent with the water treatment means 57, injected with a neutralizing agent or the like, treated and returned to the dissolution tank 45 for reuse. .

On the other hand, the gas in the cylinders of the respective processing furnaces is supplied from the ducts 17, 26 and 37 via the conduit 41 to the combustion means 5.
Then, the gas is burned to remove the tar component, the gas is cooled to a temperature lower than the endurable temperature of the bag filter 51, and then sent to the bag filter 51. The bag filter 51 uses a treating agent to perform detoxification processing by well-known means, further performs combustion processing in an exhaust gas combustion section 53, and then discharges the fuel from a chimney 54.

The heating control of the drying processing furnace 10, the chloride generation furnace 20, and the volume reduction heating processing furnace 30 is generally performed as follows.

In the drying furnace 10, a valve (open / close or
Means for selecting the number of tubes to be used by controlling the opening and closing of the valve by controlling the opening and closing of the valve, or by controlling the opening and closing of the valve by using a plurality of connecting pipes 49, or AC current supplied to the heating coil 18, or in the case of induction heating. This is performed by means for controlling the frequency. In these controls, the gas concentration of HCI or the like in the duct 17 is automatically or manually controlled by the temperature detected by the gas concentration meter 58 or the temperature sensor provided in the temperature sensor mounting cylinder 19.

Further, in the chloride producing furnace 20, the valve opening / closing control of the connecting pipe 48 with the heating cylinder 32 of the volume-reducing heating processing furnace 30 or the current ( Frequency) control.

Further, in the volume reducing heat treatment furnace 30,
Although substantially the same as the above, the control of the LNG combustion means by the combustion device 46 is mainly performed. All of these controls reflect the gas concentration meters 59, 60, 61, 62 for measuring the HCI concentration in the ducts 26, 27, 36, 37 and the temperature.

The embodiment shown in FIG.
As means for stirring and moving the objects to be treated in the chloride production furnace 20 and the volume-reduction heat treatment furnace 30, FIG.
This is the case where the cylindrical body itself is rotated and moved by providing the blades as shown in the above.However, it is not always necessary to rotate the cylindrical body, and the cylindrical body is fixed, and a screw body that is long in the axial direction inside is formed. Alternatively, the screw body may be driven to rotate from outside.

Further, as the heating means for heating the cylindrical body, a case has been described in which both heating by a hot gas and heating by a heating coil are applied, but either one of the heating means may be used.

The volume reduction in the heat treatment furnace 30 may be performed by carbonizing the material to be treated, separating and collecting metals and the like, and incineration of other residues at a high temperature.

As described above, according to the present invention, the step of removing (drying) water coexisting with the object to be treated, and decomposing and depositing a halogen substance (in particular, chlorine) contained in the object to be reacted with an alkali substance. The chloride generation step and the subsequent volume reduction step of reducing the volume of the material to be treated by carbonization or the like are performed in separate heat treatment furnaces, and halogen substances (particularly, hydrogen chloride) are contained in the residue.
Is basically used to prevent the reaction from remaining. Therefore, the number and arrangement of the processing furnaces for performing these processes can be realized by arbitrarily selecting them according to the conditions of the installation place and the like.

The embodiment will be described with reference to a schematic diagram.

Now, the drying treatment furnace is a drying means 1, the chloride producing furnace is a chloride producing means 2, the volume-reducing heating treatment furnace is a volume reducing means 3,
Assuming that four ducts communicate these, the processing apparatus of FIG. 1 is schematically illustrated as in FIG.

That is, the drying means 1, the chlorination generation means 2 and the volume reduction means 3 are placed side by side in the horizontal direction, and the discharge port of the drying means 1 and the supply port of the chlorination generation means 2 are communicated by the duct 4. In addition, the discharge port of the chloride generation means 2 and the supply port of the volume reducing means 3 communicate with each other through a duct 4 ′, and the material to be treated is supplied from the supply port of the drying means. The material to be treated whose volume has been reduced by the above procedure is discharged. In the figure, 5,
Reference numeral 5 'denotes an opening / closing door (opening / closing valve) provided in each of the ducts 4 and 4', which makes it possible to control the transfer amount of the workpiece.

FIG. 4 is a schematic front view of the second embodiment, in which two drying means 1 and 1 'are provided in the first embodiment.
This is a case where both drying means are dried and supplied to the chloride generating means 2.

FIG. 5 is a front view of a schematic view of the third embodiment, wherein the chloride generating means 2 and the volume reducing means 3 are arranged on the same side of a duct 4 ′, and the drying means 1 sandwiches the duct 4. This is the case where it is installed on the opposite side of the chloride generation means.

In the above embodiments, the ducts are erected (vertically or inclined), the processing means are arranged vertically, and the object to be processed is moved between the processing means by flowing down. However, it is not always necessary to arrange them vertically, and they may be arranged in a plane depending on the conditions of the installation place and the like. However, in this case, it is necessary to provide a transfer means (for example, a screw driven to rotate) for transferring the object to be processed in the duct.

[0068]

As described above, the present invention first removes moisture adhering to an object to be processed, and then decomposes and deposits a halogen substance (particularly, a chlorine-based gas or the like) contained in the object to be processed. Simultaneously, the decomposition reaction means for reacting with the alkaline substance and the means for heating the object to be treated to reduce the volume are performed in separate heat treatment furnaces, so that the following effects are obtained.

(1) In a decomposition reaction step of decomposing and precipitating a halogen substance (a chlorine-based gas or the like) contained in a substance to be treated, the substance to be treated and the added alkali substance are heated together, so that a minute analysis is performed. The contact reaction between the emitted chlorine-based gas and the alkali substance is quickly and reliably performed, and harmless chlorides are generated to make the generated gas and residue harmless, and no chlorine-based gas remains in the exhaust gas. Dioxin formation can be prevented.

Further, the flue gas or the exhaust gas at a high temperature can be safely used as a heat source and fuel without causing flue gas corrosion.

(2) The volume reduction step of heating and reducing the volume of the processing object from which the chlorine-based gas has been removed is performed in a heating processing furnace different from the heating processing furnace in the previous decomposition reaction step. In the consolidation step, dioxins generated due to halogen substances do not exist in the residue, so that the dioxins do not adsorb and mix in the residue (carbide, ash), and the residue can be made harmless. Metals and carbides can be extracted from the residue and reused.

(3) In the decomposition reaction step of decomposing and depositing the halogen substance, first, after the drying step of removing the moisture adhering to the object to be treated, the temperature is raised to carry out the decomposition and precipitation of the halogen substance. Can be decomposed and precipitated.

Further, harmless chlorides can be formed by contact reaction with the added alkali substance, and no harmful dioxins are generated. Therefore, in the next step, the volume of the material to be treated is reduced and discharged. It does not remain in the residues (carbides and ashes), and it is possible to extract metals from these residues or to reuse them effectively as vitrification raw materials.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a waste treatment facility according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a cylindrical body.

FIG. 3 is a schematic diagram of the first embodiment of the present invention.

FIG. 4 is a schematic diagram of a second embodiment of the present invention.

FIG. 5 is a schematic view of a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drying means 2 ... Chloride generation means 3 ... Volume reduction means 4, 4 '... Duct 5 ... Opening / closing door 10 ... Drying processing furnace 20 ... Chloride generation furnace 30 ... Volume reduction heating processing furnace 11, 21, 31 ... Cylindrical Body 12, 22, 32 ... Heating cylinder 13, 23, 33 ... Supply port 14, 24, 34 ... Discharge port 15, 25, 35 ... Rotation drive means 16, 26, 36 ... Supply side duct 17, 27, 37 ... Discharge Side ducts 18, 28, 38 ... Heating coils 19, 29, 39 ... Temperature sensor mounting cylinder 40 ... Hopper 41 ... Pipe lines 42, 43, 44 ... Open / close valve 45 ... Melting tank 46 ... Combustion device 47 ... LNG tank 48 ... Discharge pipe 49 ... Connecting pipe 50 ... Drying means 51 ... Bag filter 52 ... Combustion means 53 ... Exhaust gas combustion unit 54 ... Chimney 55 ... Dehydration means 56 ... Carbide hopper 57 ... Water treatment means 58, 59, 6, 61, 62 ... Gas Degree meter

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B09B 3/00 302F 302G

Claims (14)

[Claims] 1. A method for heat-treating an object to be treated containing a halogen substance to reduce the volume of the object to be treated, wherein the heat treatment comprises adding an alkali substance to the object to be treated and heating the object in a heating furnace. A decomposition reaction step of decomposing and depositing a halogen substance from the object to be treated, and performing a detoxification treatment of the exhaust gas and a detoxification of the object by producing a harmless chloride by contacting and reacting with an alkali substance, A volume reduction step of reducing the volume of the material to be treated in the decomposition reaction step by carbonization or the like, wherein the decomposition reaction step includes a drying step of removing water from the material to be processed, and generation of harmless chloride. Each of which is performed in a different heat treatment furnace. 2. The method according to claim 1, wherein the alkali substance is at least one selected from the group consisting of alkali metals, alkaline earth metals, and alkaline earth metal compounds which react with halogen substances to form harmless chlorides. Claim 1.
A method for treating a halogen-containing substance as described in the above. 3. The method for treating a halogen-containing substance according to claim 1, wherein the heat treatment in the drying step is performed by heating at a temperature at which moisture adhering to the object to be treated is removed. 4. The heat treatment temperature in the drying step is from 100 ° C.
The method for treating a halogen-containing substance according to claim 1, wherein the temperature is 200 ° C. 5. 5. The method for treating a halogen-containing substance according to claim 1, wherein the heat treatment in the chloride generation step is performed at a temperature at which a halogen substance is decomposed and precipitated from the object to be treated. 6. The heat treatment temperature in the chloride generation step is 200 ° C. to 350 ° C. at which a halogen substance is decomposed and precipitated from the object to be treated.
The method for treating a halogen-containing substance according to claim 1 or 5, wherein the temperature is ° C. 7. The method for treating a halogen-containing material according to claim 1, wherein the heat treatment in the volume reduction step is performed in at least one heat treatment furnace. 8. The method for treating a halogen-containing material according to claim 1, wherein the volume reducing step includes performing carbonization or incineration of the object to be treated. 9. The volume reduction step according to claim 1, wherein after carbonization, metals are separated and recovered, and other residues are performed in different heat treatment furnaces. For treating halogen-containing substances. 10. The heat treatment in the volume reduction step is performed at a temperature of 350 ° C. to 700 ° C. at which the material to be treated is carbonized or 800 ° C. or more at which the material is incinerated. The method for treating a halogen-containing substance according to any one of the above. 11. A drying furnace for drying an object to be processed, and an alkali substance added to the object to be processed is heated to decompose and precipitate a halogen substance from the object to be processed, and contact and react with the alkali substance to form harmless chloride. A furnace for producing a substance, a heat treatment furnace for reducing the volume of the material to be treated which has been treated in this furnace by carbonization, etc., and a duct for guiding the material to be treated between the respective furnaces. These drying treatment furnace, chloride production furnace and volume reduction heating treatment furnace, a cylindrical body having a supply port for supplying an object to be treated on one end side and a discharge port for discharging the same on the other end side, A means for transferring the object to be processed while stirring the inside of the cylindrical body from the supply port to the discharge port side, and a heating means for heating the cylindrical body from the outside, the discharge port of the drying processing furnace and the chloride generation furnace To the supply port of the chlorination furnace And the supply port of the volume reduction heat treatment furnace are communicated with another duct so that the object to be treated is supplied from the supply port of the drying processing furnace and discharged from the discharge port of the volume reduction processing furnace. An apparatus for treating a halogen-containing substance. 12. A drying furnace, a chloride producing furnace, and a volume-reducing heating furnace are placed side by side in a horizontal direction, and an outlet of the drying furnace and a supply port of the chloride producing furnace are connected by a duct. 2. The apparatus according to claim 1, wherein the discharge port of the chloride generation furnace and the supply port of the volume reduction heat treatment furnace are connected by another duct.
2. An apparatus for treating a halogen-containing substance according to claim 1. 13. The apparatus for treating a halogen-containing substance according to claim 11, wherein the drying treatment furnace is provided on both sides of the duct with the duct interposed therebetween. 14. A drying furnace and a chloride producing furnace are arranged on both sides of a duct, and the chloride producing furnace and the volume reducing heat treating furnace are arranged on the same side of the duct. An apparatus for treating a halogen-containing substance according to claim 11.