JP2003126802A - Method and device for treating incineration ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating incineration ash having an energetic advantage, capable of saving a space and hardly conducting re-synthesis of dioxins, and to provide a device for treating the incineration ash capable of suitably being used for the method, hardly occurring adhesion of a material to be treated to a furnace wall and excellently conducting agitation of the material to be treated or the like. SOLUTION: In the method for treating the incineration ash, the incineration ash is moved and heated inside a heating device 10 and an organic chlorine compound contained in the incineration ash is decomposed. In the method, the incineration ash is preheated by heat exchange with the material to be treated in a region at a preceding stage side of an outward route using the heating device 10 having the outward and a homeward routes for the material to be treated partitioned by a heat transfer material. After that, the incineration ash is heated at 400-500 deg.C in each region at a post stage side of the outward route or a preceding stage side of the homeward route. Then, the material to be treated is cooled in a region at a post stage side of the homeward route by the heat exchange with the incineration ash.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for treating incinerated ash (including dust fly ash, etc.) generated when incinerating municipal solid waste, industrial waste, etc., and treatment of incinerated ash particularly suitable for the treatment. With regard to the device, it is useful as a technique for reducing harmful organic chlorine compounds contained in incineration ash.

[0002]

2. Description of the Related Art Organochlorine compounds harmful to the human body, for example,
PCDD (Polychlorinated dibenzodioxin), PCD
It is known that highly toxic aromatic chlorine compounds such as F (polychlorinated dibenzofuran) are produced as secondary products during refuse incineration and pollute the environment (KO).
lieetal, Chemosphere, 6,455
(1977) etc.). It is also pointed out that the organic chlorine compound is mixed in the incinerated ash discharged from the electric dust collector (EP) and other dust removing devices attached to the refuse incineration facility. When PCDD, PCDF, etc. are contained in the incineration ash, when the incineration ash is used for landfill, for example, there is a risk that it will be returned to the human body, animals and plants through leachate and the like, and adversely affect it.

As a device for reducing the organic chlorine compounds in such incineration ash, a horizontal type incineration ash heating dechlorination device having a screw rotating shaft is known, for example, as disclosed in JP-A-3-275184. There is. FIG. 5 is an explanatory view of such a conventional thermal dechlorination apparatus. This device comprises a device body 51 that is long in the horizontal direction and an incinerator ash A inlet 52 that is provided at a distance in the axial direction of the device body 51.
And a discharge port 53 of the processed material, a rotary shaft 56 provided in the apparatus main body 51, an introduction screw 54, a stirring blade 57 and a discharge screw 55 fixed to the rotary shaft 56, and the apparatus main body 51. It is mainly composed of a band heater 58 disposed on the surface of the. The incineration ash A, which is the object to be treated, is charged into the apparatus main body 51 from the incineration ash charging port 52, moves toward the discharge port 53 under the action of the introduction screw 54 of the rotating shaft 56, and the stirring blade 57 is provided during this period.
The mixture is stirred and mixed by and is heated to 300 ° C. or higher, for example, 400 ° C. by the band heater 58, and the organic chlorine compound contained in the incinerated ash A is decomposed. The processed product from which the organic chlorine compound has been decomposed and removed is extracted from the discharge port 53 to the outside of the apparatus.

Further, in Japanese Unexamined Patent Publication (Kokai) No. 6-321172, in order to provide a method and an apparatus for treating incinerated ash which can always obtain a high dechlorination rate, the incinerated ash collected from a refuse incinerator is heated. In an incineration ash treatment method in which an organic chlorine compound contained in the incineration ash is decomposed by heating while moving in the device, an air flow opposite to the moving direction of the incineration ash is formed to purge the inside of the heating device. However, a method of heating incinerated ash to 300 ° C. or higher is disclosed.

[0005]

However, when the heating device as described in the above publication is used, it is necessary to preheat the incineration ash as a raw material and to cool the processed material, which is disadvantageous in terms of energy and complicates the entire equipment. , Easy to upsize. Also,
There is a problem that dioxins are re-synthesized from the decomposition products unless the temperature conditions and the like are appropriately controlled when cooling the processed product under the air flow.

On the other hand, Japanese Patent Laid-Open No. 2001-25735 discloses a method of decomposing dioxins in ash in the presence of oxygen at 400 to 550 ° C., but the incinerated ash is heated at such a high temperature. In such a case, in the processing apparatus as described in the above publication and a general rotary heating furnace, the difficulty of sticking the processed material to the furnace wall and stirring is likely to become a problem, and problems easily occur in terms of maintenance and processing efficiency. That is, general dust fly ash has a high content of calcium chloride, and further contains cadmium, lead, zinc, etc., so the melting point of fly ash becomes lower than the heating temperature, and the treated material adheres to the furnace wall. Is likely to occur.

Therefore, an object of the present invention is to provide a method for treating incinerated ash which is energy-saving, space-saving, and is less likely to re-synthesize dioxins. Another object of the present invention is to provide an incineration ash treatment apparatus which can be suitably used in this treatment method, and in which the treated material is less likely to adhere to the furnace wall and the treated material can be stirred well.

[0008]

In order to achieve the above-mentioned object, the inventors of the present invention have conceived to preheat the incineration ash and cool the processed material by heat exchange in the heating device, and even in that case, it is more than usual. The present invention has been completed by finding that re-synthesis of dioxins is unlikely to occur when the processed material is cooled by performing the heat treatment at a high temperature.

That is, the method for treating incinerated ash according to the present invention is a method for treating incinerated ash in which the organic chlorinated compounds contained in the incinerated ash are decomposed by heating while moving the incinerated ash in a heating device. After preheating the incineration ash by heat exchange with the processed material in the area on the upstream side of the outward path by using the heating device equipped with the outward path and the return path of the processed article partitioned by And, it is characterized in that it is heated at 400 to 500 ° C. in any region on the upstream side of the return route, and then the processed product is cooled by heat exchange with incinerated ash in the region on the downstream side of the return route.

In the above, the heating device is a horizontal rotary heating device having a forward path of the object to be treated between an inner cylinder and an outer cylinder, and the return path inside the inner cylinder, and the outer cylinder and the inner cylinder. It is preferable to rotate the cylinder and a different speed, and scrape the object to be adhered to the inner surface of the outer cylinder with a blade standing from the inner cylinder.

Further, it is preferable to carry out the treatment while passing air or an inert gas or a mixed gas thereof from the rear stage side of the return route to the front stage side of the outward route.

On the other hand, the incinerator ash treating apparatus of the present invention has an outer cylinder having a substantially horizontal axis of rotation with an incinerator ash introduction portion at one end and a closed other end, and an opening portion near the other end. And an inner cylinder that is relatively rotatable about the same axis of rotation as the outer cylinder that has a treated product discharge portion at the other end, and heating means that is arranged near the outer periphery of the other end of the outer cylinder. A device for treating incineration ash, comprising: an outer cylinder and a rotation drive means capable of rotating the inner cylinder at different speeds, wherein the inner cylinder stands from its outer peripheral surface to a vicinity of the inner peripheral surface of the outer cylinder. A plurality of partition blades extending along the axial direction while being installed and a plurality of partition spaces partitioned by the partition blades are allowed to communicate with each other in the axial direction while being inclined with respect to the axial direction and arranged near the opening. A plurality of guide vanes that are provided, and the inclination direction of the guide vanes is defined by the plurality of axial space. The ash introduced by the rotation driving means as substantially rotationally symmetrical and can be transferred to the other end side with,
Inside the inner cylinder, there is a transfer means for transferring the processed material introduced from the opening to the discharge part.

In the above, the transfer means allows axial communication between the partition wall for partitioning the internal space of the inner cylinder into a plurality of partitions and the plurality of internal spaces partitioned by the partition wall in the axial direction. A plurality of guide plates that are arranged to be inclined, and the guide plate is inclined so that the inclination direction of the guide plates is substantially rotationally symmetrical with respect to the plurality of internal spaces, and the processed material introduced from the opening is discharged by the rotation of the inner cylinder. It is preferable to be able to transfer to the section side.

[Operation and Effect] According to the method for treating incinerated ash of the present invention, a heating device provided with an outward path and an inward path of an object to be processed which is partitioned by a heat transfer material is used, and the object to be processed is in a region on the upstream side of the outward path. After preheating the incineration ash by heat exchange with, the incineration ash is heat-treated in any one of the rear stage side of the forward route and the front stage side of the return route, and then the processed product is in the rear stage side region of the return route. Since it is cooled by exchanging heat with the incineration ash, preheating of the incinerator ash as a raw material and cooling of the processed material are almost unnecessary.
Further, since the heat treatment is carried out at 400 to 500 ° C., as shown by the results of the examples, even if the treated product is gradually cooled during cooling, re-synthesis of dioxins hardly occurs. as a result,
It is possible to provide a method for treating incinerated ash that is energy-friendly, space-saving can be achieved, and dioxins are hardly resynthesized.

The heating device is a horizontal rotary heating device having a forward path of the object to be treated between an inner cylinder and an outer cylinder, and the return path inside the inner cylinder. The outer cylinder and the inner cylinder are connected to each other. When rotating at different speeds and scraping the processed material adhering to the inner surface of the outer cylinder with the blades standing upright from the inner cylinder, the heat of the processed material moving in the return path inside the inner cylinder moves in the outward path around it. There is little heat loss when heat is transferred to, and it is possible to efficiently preheat the incineration ash and cool the processed material. Further, the problem of sticking of the processed material can be solved by scraping the processed material attached to the inner surface of the outer cylinder with the blades standing from the inner cylinder.

When the treatment is performed while circulating air or an inert gas or a mixed gas thereof from the rear side of the return path to the front side of the outward path, a trace amount of metal chloride generated is treated in a high temperature state. Since the chance of contact with the object is reduced, the melting point is less likely to be lowered due to the condensation, and the processed material is less likely to be fixed to the apparatus wall surface.

On the other hand, according to the incineration ash treatment apparatus of the present invention, a plurality of partition blades extending in the axial direction while standing from the outer peripheral surface of the inner cylinder to the vicinity of the inner peripheral surface of the outer cylinder, and the partition blades. And a plurality of guide blades that are inclined to the axial direction and are arranged near the opening while allowing communication in the axial direction of the plurality of partitioned axial spaces. Since the plural axial spaces are substantially rotationally symmetrical, the incineration ash introduced by the rotation driving means can be transferred to the other end side while stirring and rolling. Since the heating means is arranged near the outer circumference on the other end side of the outer cylinder, the organochlorine compound contained in the incinerated ash should be decomposed inside the inner cylinder on the other end side of the outer cylinder and in the vicinity thereof. You can Further, since there is a transfer means inside the inner cylinder for transferring the processed material introduced from the opening to the discharge section, heat exchange between the high temperature processed material transferred to the discharge section side and the raw material incineration ash. Can be efficiently performed via the inner cylinder. Furthermore,
The inner cylinder, which has a partitioning blade on its surface upright up to the vicinity of the inner peripheral surface of the outer cylinder, is rotatable relative to the outer cylinder and is provided with a rotation driving means capable of rotating both at different speeds, so that the adherence of the processed material can be prevented. It is possible to suitably scrape the adhered matter from the inner peripheral surface of the outer cylinder, which is likely to cause a problem, with the partition blade. As a result, it is possible to provide an incineration ash treatment apparatus which can be suitably used in the treatment method of the present invention, and in which the treated material is less likely to adhere to the furnace wall and the treated material and the like can be well stirred.

The transfer means is inclined with respect to the axial direction while permitting axial communication between the partition wall partitioning the inner space of the inner cylinder into a plurality of partitions and the plurality of internal spaces partitioned by the partition wall. A plurality of guide plates that are disposed, the inclination direction of the guide plates is substantially rotationally symmetrical with respect to the plurality of internal spaces, and the processed product introduced from the opening by the rotation of the inner cylinder is directed to the discharge unit side. When it is possible to transfer, by rotating the inner cylinder by the partition wall and the guide plate, it is possible to transfer the processed product to the discharge part side while stirring and rolling. Therefore, it is not necessary to separately provide a rotating body and a driving means for the rotating body inside the inner cylinder, and it is possible to further improve maintainability and space saving.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of an example of the processing apparatus of the present invention. The broken line in the figure shows the flow of gas, and the solid line shows the flow of solids such as incineration ash.

The method for treating incinerated ash according to the present invention uses a heating device provided with an outward path and a return path of an object to be treated which is partitioned by a heat transfer material, and heats the incinerated ash while moving in the heating device to incinerate the incinerated ash. It decomposes organic chlorine compounds contained in ash. In the present embodiment, as shown in FIG.
However, the forward path of the object to be processed is provided between the inner cylinder 20 and the outer cylinder 11,
An example is shown, which is a horizontal rotary heating device having a return path for the material to be processed inside the inner cylinder 20, and performs processing while circulating gas such as air from the rear side of the return path to the front side of the outward path.

In the treatment method of the present invention, first, the incineration ash is preheated by heat exchange with the treated material in the region on the upstream side of the outward path. As the incineration ash used, incineration ash (including dust fly ash) generated when incinerating general waste such as municipal waste or industrial waste can be used. The incineration ash is stored in the storage hopper 1, for example.
Is stored in the heating device 1 and a predetermined amount of the heating device 1 is stored by the fixed amount cutting device.
0 is supplied from the inlet 12a. The supplied incineration ash moves through the supply pipe 12 to the outer cylinder 11 side, and further moves to the other end side of the outer cylinder 11 via the introduction portion 11a of the outer cylinder 11. The incineration ash can be preheated by exchanging heat with the processed material moving inside the inner cylinder 20 in the region on the upstream side of the outward path. The area for heat exchange is the heat insulating material 13.
You may coat with.

Then, the incinerated ash is heated to 400 to 500 ° C. in either of the downstream side of the forward path and the upstream side of the return path.
Heat at. It is also possible to increase the decomposition rate of dioxins to 95% or more by the heat treatment. If the heating temperature is less than 400 ° C, re-synthesis of dioxins is likely to occur when the treated product is gradually cooled during cooling. Also, 500
When the temperature is higher than 0 ° C, the processed product is apt to be melted or adhered, which is disadvantageous in terms of energy.

The heating can be performed by the heating means 14 arranged near the outer circumference of the outer cylinder 11. An electric heater, a combustion type heater, a gas supply heater, or the like can be used as the heating means 14, but an electric heater is preferable in terms of simplifying and downsizing the entire equipment. In addition, it is preferable to provide the heat insulating material 15 around the portion formed by the heating means 14.

The incinerated ash moves to the other end side of the outer cylinder 11 while being heated by the heating means 14, is then moved to the inside from the opening 21 of the inner cylinder 20, and is further heated while being heated.
To the discharge unit 22 side.

The processed material after heating is cooled by heat exchange with incinerated ash in the area on the latter stage side of the return path. The preheating of the incineration ash by heat exchange and the cooling of the treated product preferably result in the temperature difference between the raw incinerated ash and the discharged treated product being within 200 ° C, and 100 ° C.
It is more preferable that the amount is within the range. In addition, the temperature of the discharged product after cooling is preferably 250 ° C. or lower, and 200 ° C.
The following is more preferable. The amount of heat exchanged can be determined by the amount of treatment, the residence time, the heat transfer area, and the like.

In the present embodiment, the inner cylinder 20 serves as a heat transfer material that separates the outward path and the return path. As such a heat transfer material, a metal material, ceramics, or the like can be used. Particularly, in terms of workability, the metal material is used. Is preferred. Further, since the stirring blades and the like formed on the outer peripheral surface or the inner peripheral surface of the inner cylinder 20 also have a heat transfer function, it is preferable that they are made of the same heat transfer material.

After precooling, the processed product is discharged from the discharge part 22 of the inner cylinder 20.
Emitted from. The processed material discharged from the inner cylinder 20 is discharged to the outside of the system after being once stored or continuously, but in the present invention, since sufficient cooling can be performed, an additional cooling device may be unnecessary. It is possible. Also, depending on the conditions,
It is also possible to reduce the energy consumption (for example, power consumption) to 1/2 to 1/3 as compared with the conventional incineration ash processing apparatus that does not perform heat exchange. As the temperature profile of the incineration ash in the treatment method of the present invention, for example, when the set temperature of the heating means 14 is 500 ° C., the introduction part 11 of the outer cylinder 11 is used.
The incineration ash in a is about 90 ° C., the heating means 14 of the outer cylinder 11
Immediately before the inside, about 230 ° C., about 430 ° C. near the opening 21 of the inner cylinder 20, and about 3 immediately after the inside of the heating means 14 of the inner cylinder 20.
30 ℃, about 120 ℃ inside the inner cylinder 20 near the introduction part 11a
Is. According to the processing method of the present invention, for example, 10
0 to 1000 kg of incinerated ash can be treated.

In the present embodiment, the treatment is carried out from the rear side of the returning path of the incinerated ash to the front side of the outward path while circulating air or an inert gas or a mixed gas thereof. As the circulating gas, air is most preferable in terms of cost and the like.

The direction of the flowing gas may be the opposite direction, but the above flowing direction is preferable from the viewpoint of solving the problem of the adherence of the treated material due to the metal chloride generated as described above. As metal chlorides, chlorides such as sodium, calcium and potassium are particularly apt to be a problem.

A specific flow path is as follows. First, a gas supplied from the atmosphere or from a nitrogen gas cylinder, a nitrogen generator or the like is introduced from the discharge part 22 of the inner cylinder 20 and circulates in the inner space of the inner cylinder 20. Through the opening 21 of the inner cylinder 20,
The space between the inner cylinder 20 and the outer cylinder 11 is further circulated, and is discharged from the heating device 10 via the introduction portion 11a of the outer cylinder 11 and the introduction port 12a of the supply pipe 12. After that, after being supplied to the bag filter 16 to collect dust, it is supplied to the condenser 17 to collect and remove mercury and the like as drain. Cooling water for cooling is supplied to and discharged from the condenser 17. The downstream side of the capacitor 17 is provided an exhaust fan 18, the suction and exhaust gas, without air emissions, for example, preferably fed like incinerators or collector <br/> dust device BH. This is because the exhaust gas contains a small amount of unburned gas such as dioxins and carbon monoxide.

Next, the incineration ash processing apparatus of the present invention will be described. The incinerator ash treatment apparatus of the present invention can be preferably used in the treatment method of the present invention, and in particular, is an apparatus that does not easily adhere to the furnace wall of the processed material and that can stir the processed material well. .

The processing apparatus of the present invention, as shown in FIG.
An outer cylinder 11 whose rotation axis O is substantially horizontal, an inner cylinder 20 which is disposed inside the outer cylinder 11 and is relatively rotatable with the rotation axis O substantially the same as the outer cylinder 11, and heating arranged near the outer circumference of the outer cylinder 11. Means 1
4 and rotation drive means 30.

The outer cylinder 11 has at one end thereof an incineration ash introduction section 1
1a and the other end is closed. The supply pipe 12 is connected to the introduction portion 11a via the seal portion S, and the supply pipe 12
An ash inlet 12a is provided on the upstream side of the. A flange portion 11b for rotation support is provided near the introduction portion 11a of the outer cylinder 11, and a heat insulating material 13 is provided on the outer peripheral surface from that portion to the position of the longitudinal center of the outer cylinder 11. .

The other end of the outer cylinder 11 is closed by an annular member,
A heat insulating material 11c is provided inside thereof. A shaft tube 19 is connected to the annular member, and the shaft tube 19 is rotatably supported by a support mechanism 33. The support mechanism 33 is internally provided with a bearing, and the inner cylinder 20 is also rotatably supported. Further, the shaft tube 19 is provided with a sprocket 19a for rotational driving.

The inner cylinder 20 has an opening 21 in the vicinity of the other end of the outer cylinder 11, and a discharge portion 22 for the processed material at the other end. Further, a small-diameter pipe portion 20b having a smaller diameter than the portion 20a arranged inside the outer cylinder 11 is connected to the discharge portion 22 side.

As shown in FIGS. 2 to 4, a portion 20a of the inner cylinder 20 disposed inside the outer cylinder 11 is erected from the outer peripheral surface thereof to the vicinity of the inner peripheral surface of the outer cylinder 11 in the axial direction. A plurality of (two in the illustrated example) partition blades 23 extending along the are provided. The partition blades 23 extend to the vicinity of both ends of the outer cylinder 11 so as to divide the space between the outer cylinder 11 and the inner cylinder 20. The partition blade 23 need not be a flat plate,
The shape may be slightly twisted.

A plurality of guide blades 2 are provided on the inner cylinder 20 so as to be inclined with respect to the axial direction up to the vicinity of the opening 21.
4,25. The end edges of the guide blades 24 and 25 are partially separated from the inner peripheral surface of the outer cylinder 11, thereby allowing the axial spaces of the plurality of axial spaces divided by the partition blade 23 to communicate with each other. The inclination directions of the guide blades 24 and 25 are substantially rotationally symmetric with respect to a plurality (two in the example of the drawing) of the axial direction space, whereby the rotation driving means 3 is provided.
The incineration ash introduced by 0 can be transferred to the other end side.

That is, when the inner cylinder 20 is rotated in the direction of the arrow A1 and the incinerated ash is located on the back side of the paper surface of FIG. 3, almost no axial movement occurs, and the incinerated ash is placed on the front surface of the paper surface of FIG. When is located, the incineration ash travels along the guide blades 24 and drops in the direction of the arrow A2 (direction inclined with respect to the axial direction) (the rolling stirring effect at that time is great), and movement in the axial direction occurs. The incineration ash dropped by the subsequent rotation is similarly scooped by the downstream guide vane 24 and sequentially transferred in the axial direction. Therefore, the enlarged diameter portion 24a of the guide blade 24
Is preferably erected from the outer peripheral surface of the inner cylinder 20 to the vicinity of the inner peripheral surface of the outer cylinder 11, and preferably has no gap between it and the partition blade 23.

In the processing apparatus of the present invention, the inner cylinder 20 has a transfer means for transferring the processed material introduced from the opening 21 to the discharge section 22. In the present embodiment, this transfer means divides the inner space of the inner cylinder 20 into a plurality of partition walls 31.
And a plurality of guide plates 26 and 27 which are arranged to be inclined with respect to the axial direction while permitting axial communication of the plurality of internal spaces partitioned by the partition wall 31.
The inclination directions of the guide plates 26 and 27 are substantially rotationally symmetric with respect to a plurality of (two in the example of the drawing) internal spaces,
With the same transfer mechanism as described above, the processed material introduced from the opening 21 by the rotation of the inner cylinder 20 can be transferred to the discharge section 22 side.

A shaft tube 28 is connected to the opening 21 side of the inner cylinder 20, and is supported together with the outer cylinder 11 by a support mechanism 33. A seal portion S is provided between the shaft tube 28 and the shaft tube 19.
Sensors such as thermocouples can be inserted into the shaft tube 28, and similarly, an insertion tube can be provided in the partition wall 31.

On the other hand, screw-shaped blades 34 are provided on the outer peripheral surface of the small-diameter pipe portion 20b, and the introduction port 12a of the supply pipe 12 is provided.
The incineration ash supplied from the above is transferred to the outer cylinder 11 side by the rotation of the inner cylinder 20. A screw-shaped blade 35 formed on the shaft 36 is also provided inside the small-diameter pipe portion 20b, and the processed material introduced from the outer cylinder 11 side is transferred to the discharge portion 22 side by the rotation of the inner cylinder 20. . Since the heat insulating material is not provided on the outer circumference of the supply pipe 12, it is advantageous to further lower the temperature of the processed product discharged from the discharge part 22.
On the contrary, the portion provided with the heat insulating material 13 is advantageous in increasing the preheating temperature of the incineration ash.

The small diameter tube portion 20b is provided with a sprocket 37 for rotational driving. On both sides of the sprocket 37, the seal portion S with the supply pipe 12 and the take-out portion 3 are provided.
8 and a seal portion S.

The heating means 14 is arranged near the outer periphery of the outer cylinder 11 on the other end side. At this time, the outer cylinder 11 may be fixed and rotated at the same time, but in order to improve the uniformity of heating, it is preferable that the outer cylinder 11 is fixed without a line. The heating means 14 is composed of a heater portion 14a, an inner heat insulating material 14b, an outer heat insulating material 14c and the like.

The rotation driving means 30 includes an outer cylinder 11 and an inner cylinder 20.
And rotate at different speeds. In the present embodiment, the outer cylinder 11 is driven by the sprocket 19a and the inner cylinder 20 is driven by the sprocket 37 by an electric motor or the like, which is chain-driven to rotationally drive both. The rotation support is
The flange portion 11b and the support mechanism 33 are used. The rotation speed difference between the outer cylinder 11 and the inner cylinder 20 is preferably 10 to 50% of the rotation speed of the inner cylinder 20 in order to prevent the processed material from sticking.

The processed material discharged from the discharge section 22 of the inner cylinder 20 is taken out via the take-out section 38. Extraction section 38
An inlet 39 for the circulating gas is provided in the inside of the incinerator ash, and the introduced circulating gas is introduced from the discharge portion 22 of the inner cylinder 20 through the opening 21 to the outer cylinder 11 and the supply pipe 12.
Emitted from.

[Other Embodiments] Other embodiments of the present invention will be described below.

(1) In the above-described embodiment, the processing method of the present invention is provided with the outward path of the object to be processed between the inner cylinder and the outer cylinder,
Although an example in which the horizontal rotary heating device provided with the return path inside the inner cylinder is used is shown, other types of horizontal rotary heating devices and devices other than the rotary heating device can be used.

For example, the guide plate described above may be rotated in the axial direction by reversing the inside and outside of the forward path and the reverse path, or dividing the inside of the single tube into two spaces so that each space becomes the forward path and the return path. You may use the rotary heating device inclined in substantially the same direction. Alternatively, a non-rotating heating device may be used in which a forward transfer mechanism and a backward transfer mechanism, which are partitioned by the heat transfer material, are separately provided.

(2) In the above-described embodiment, the processing method of the present invention is shown as an example in which the processing gas is passed from the rear side of the return path of the processed material to the front side of the forward path of the processed material while circulating the circulating gas. However, the treatment may be performed without circulating the gas, or the treatment may be performed while circulating the circulating gas. Further, a circulating gas may be introduced through the shaft tube 28 of the inner cylinder 11 and may be separately circulated in the forward path of the incineration ash and the backward path of the processed material.

(3) In the above-described embodiment, an example in which the transfer means of the processing apparatus of the present invention is composed of a partition wall for partitioning the inner space of the inner cylinder into a plurality of partitions and a plurality of guide plates has been described. The transfer means may be one in which the body is inserted separately and transferred by its own rotation. For example, a rotary shaft provided with screw-shaped or propeller-shaped blades may be used.

(4) In addition, as the drive mechanism, the drive source, the rotation support mechanism, the heat insulating material, the heating means, the heat source, etc., any of those used in the same rotary heating device can be applied.

[0052]

EXAMPLES Examples and the like specifically showing the constitution and effects of the present invention will be described below.

Example 1 Using the processing apparatus shown in FIGS. 1 to 4, raw material temperature: 20 ° C.
Raw material input rate: 10 kg / hr, purge gas: air, purge gas flow rate: 5 Nm ³ / hr, average residence time of ash in the device: 1.0 hour bag filter ash (dioxin) The concentration of the products is as shown in Table 1) and the ash temperature is 406 to 483 ° C (heater temperature is 400 to 5
Heat dechlorination treatment was performed at 50 ° C. About 12 from the processor
The treated product discharged at 0 ° C. was analyzed by gas chromatography-mass spectrometer by SIM method using PCDDs, PC
The DFs were measured, and the decomposition rate for the raw ash was determined for each of the total amount and the toxicity equivalent concentration. The results are shown in Table 1.

Comparative Example 1 In Example 1, the heat dechlorination treatment was carried out under the same conditions except that the ash temperature during the heat treatment was changed to 344 ° C.
The decomposition rate of the treated product was obtained. The results are shown in Table 1.

[0055]

[Table 1] As shown in the results of Table 1, in Example 1, 400 to 500
At the treatment temperature of ° C, there was almost no re-synthesis upon cooling by heat exchange, and a decomposition rate of 97% or more was obtained. On the other hand, in Comparative Example 1 which was heat-treated at 344 ° C., the decomposition rate was about 40%, and when the conditions such as heating temperature, circulating gas, and residence time were taken into consideration, re-synthesis occurred during cooling by heat exchange. It is considered that the decomposition rate decreased because it occurred.

Example 2 A thermal dechlorination treatment was carried out under the same conditions as in Example 1 except that the heater temperature was fixed at 500 ° C. and the residence time was changed to 0.5 to 3 hours. The decomposition rate was determined for the treated product (temperature at discharge 120 ° C.). The results are shown in Table 2.

[0057]

[Table 2] As shown by the results in Table 2, in Example 2, there was almost no recombination during cooling by heat exchange under any of the conditions, and a high decomposition rate was obtained, and particularly in the retention time of 1.0 hour or more, 9
A decomposition rate of 9% or more was obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of an apparatus for treating incinerated ash used in the present invention.

FIG. 2 is a front sectional view showing an example of an incineration ash treatment apparatus of the present invention.

FIG. 3 is a partially cutaway perspective view showing an essential part of an example of an apparatus for treating incinerated ash according to the present invention.

FIG. 4 is a sectional side view showing a main part of an example of an apparatus for treating incinerated ash according to the present invention.

FIG. 5 is a front view showing a conventional incineration ash treatment device in a partial cross section.

[Explanation of symbols]

11 outer cylinder 11a Introduction section 14 Heating means 20 inner cylinder 21 opening 22 Discharge part 23 partition blades 24 guide blades 25 guide blades 26 Guide plate 27 Guide plate 30 rotation drive means 31 partition wall O rotation axis

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27B 7/30 B09B 3/00 ZAB (72) Inventor Yoshitada Tsunoda 2-3-2 Kinrakuji-cho, Amagasaki-shi, Hyogo No. 23 In stock company Takuma (72) Inventor Takahiro Masuda 2-32 Kinrakuji-cho, Amagasaki City, Hyogo Prefecture In stock company Takuma (72) Inventor Tatsu Chisaki 1-21 21 Namiki, Kawaguchi City, Saitama (701) 72) Inventor Daizo Kunii 1-25-16 Nakamachi, Meguro-ku, Tokyo F Term (reference) 3K061 NA07 4D004 AA36 AA37 AB06 AB07 CA34 CB09 CB32 CB34 CB45 CB50 DA03 DA06 4K061 AA08 BA12 CA27 CA29 DA05 DA07 EA07 FA06 GA06 HA03

Claims (5)

[Claims] 1. A method for treating incinerated ash, in which the incinerated ash is heated while being moved in a heating device to decompose organic chlorine compounds contained in the incinerated ash, the method comprising: After preheating the incineration ash by heat exchange with the processed material in the area on the upstream side of the outward path by using the heating device provided with the return path, the incinerated ash is either on the downstream side of the outgoing path or on the upstream side of the incoming path. 400 in area
A method for treating incinerated ash, which comprises heating at ~ 500 ° C. and then cooling the treated material by heat exchange with the incinerated ash in a region on the latter stage side of the return path. 2. The heating device is a horizontal rotary heating device having a forward path of the object to be treated between an inner cylinder and an outer cylinder, and the return path inside the inner cylinder, the outer cylinder and the inner cylinder. The method for treating incinerated ash according to claim 1, wherein the and the like are rotated at different speeds, and the object to be adhered to the inner surface of the outer cylinder is scraped off by blades provided upright from the inner cylinder. 3. The method for treating incineration ash according to claim 1, wherein the treatment is performed while circulating air, an inert gas, or a mixed gas thereof from the rear side of the return path to the front side of the outward path. 4. An outer cylinder having an incineration ash introduction portion at one end and a substantially closed rotation axis line at the other end, and an opening near the other end, and a treated product at the other end. An inner cylinder capable of relative rotation about the same rotation axis as the outer cylinder having a discharge part; a heating means arranged near the outer periphery of the other end of the outer cylinder; and the outer cylinder and the inner cylinder. An incineration ash treatment apparatus comprising: a rotation drive means that can rotate at different speeds, wherein the inner cylinder extends from the outer peripheral surface thereof to the vicinity of the inner peripheral surface of the outer cylinder while extending in the axial direction. Partition blades,
And a plurality of guide blades that are inclined to the axial direction and are arranged near the opening while permitting axial communication of a plurality of axial spaces divided by the partition blades. The incineration ash introduced by the rotation drive means can be transferred to the other end side with the inclination direction of the plurality of axial direction spaces being substantially rotationally symmetric, and inside the inner cylinder,
An incineration ash processing apparatus having a transfer means for transferring the processed material introduced from the opening to the discharge section. 5. The transfer means tilts with respect to an axial direction while permitting axial communication between a partition wall that partitions the internal space of the inner cylinder into a plurality of partitions and a plurality of internal spaces partitioned by the partition wall. A plurality of guide plates that are disposed in parallel with each other, and the inclination direction of the guide plates is substantially rotationally symmetric with respect to the plurality of internal spaces, and the processed product introduced by the rotation of the inner cylinder through the opening is discharged from the discharge unit. The incineration ash treatment apparatus according to claim 4, which is capable of being transferred to the side.