JPH0752004B2 - Organic matter removal method by fluidized bed furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for removing organic substances by a fluidized bed furnace.

More specifically, the present invention relates to a method of thermally decomposing and removing an object to be treated, such as a used spinneret, which has an organic polymer material attached to its perforated pores, in a fluidized bed furnace.

[Prior Art] It is conventionally known to heat and remove by thermal decomposition an object to be treated to which an organic polymer material such as rubber, paint, oil and plastic adheres in a fluidized bed furnace. In Japanese Patent No. 282305, an object to be treated (specifically, a used spinneret, filter, etc.) having an organic polymer material attached to the penetrated pores is heated in a fluidized bed furnace to be thermally decomposed. It is disclosed to remove.

[Problems to be Solved by the Invention] However, according to such a conventional method, the object to be treated is directly immersed in the fluidized bed, or, for example, JP-A-63-1357.
As disclosed in JP 07, the fluid medium such as alumina in the bed is immersed in a mesh basket that allows the fluid medium such as alumina to pass therethrough. Flow in and block this hole, that is, clogging occurs, so that the inflow of air gas is blocked or hindered, and it is difficult to thermally decompose and remove the organic polymer material adhering thereto. It was

Incidentally, such a problem occurs in the case where the diameter of the fluidized medium such as alumina is generally 0.05 mm to 0.3 mm, and therefore the diameter of the through hole of the object to be treated is a relatively large hole such as 0.3 mm or more. Although not, it occurs in the case of pores having a diameter of 0.2 mm or less, therefore, for objects to be treated having pores such as spinneret and spinneret filter, the treatment in a fluidized bed furnace was hindered. .

Therefore, for example, as disclosed in Japanese Examined Patent Publication (Kokoku) No. 42-18892, a container is used in which the entire peripheral wall is formed of an air permeable wall that prevents passage of a fluid medium and allows only gas to pass. It has been attempted to store the object to be treated therein and to immerse it in a fluidized bed for treatment, but even with such treatment, the gas flow into the pores is not sufficient, and therefore the fluidized medium is Although it is possible to prevent the clogging due to the heat treatment, it is difficult to quickly remove it by thermal decomposition.

The present invention pays attention to such a situation, and as a result of intensive studies from various directions to solve this, it is composed of a non-permeable material and prevents the passage of the fluid medium between the lid and the bottom of the main body of the container to prevent air gas. A container with a lid equipped with a filter that allows only the passage of the material to be processed is used, and the object to be treated is placed in the container so that the pores are arranged in the direction in which the lid and the container body bottom face each other. It has been found that they can be placed in contact with or close to the inner surface of the container, and can be treated by immersing the container in the fluidized bed so that the bottom of the container body is located on the lower side.

[Means for Solving the Problems] That is, in the method for removing an organic substance by a fluidized bed furnace according to the present invention, an object to be treated in which an organic polymer material is attached to perforated pores is heated in a fluidized bed. In an organic matter removal method by a fluidized bed furnace in which the organic polymer material is thermally decomposed and removed by immersion in an air-permeable material, which is made of an aerated material and prevents passage of a fluidized medium between the lid and the bottom of the container body, only air gas is used. In a container with a lid equipped with a filter capable of passing through, the object to be treated is placed on the bottom inner surface of the container body such that the pores are arranged in a direction in which the lid and the bottom of the container body are opposed to each other. Of the container body and the container body is housed in close proximity to the container body, and the container body is immersed in the fluidized bed so that the bottom of the container body is located on the lower side.

In the present invention, the organic polymer material means rubber, paint, oil,
The term “fluid medium” is a general term for organic substances such as plastics, and the term “fluid medium” is a generic term for refractory particles such as alumina filled in a predetermined amount in the bed. The fluid medium is uniformly supplied to the bed through a gas dispersion plate. It is fluidized by air gas (pressurized air) to form a so-called fluidized bed.

As the fluidized bed furnace, various types of furnaces generally known in the past can be used, but the heating may be any of electric heating with a heater, gas heating with a burner, etc. Controlled at 400 ℃ -600 ℃. When treated at other high temperatures, when the most common alumina is used, it tends to adhere to the object to be treated, and when the object to be treated is a metal, the risk of damage to it increases. On the other hand, if the treatment is performed at a low temperature other than this, it becomes difficult to sufficiently decompose the organic polymer material. Although it is a standard temperature,
For example, in the case of polyvinyl chloride, it may be heated to 400 ° C to 500 ° C, in the case of polypropylene, it may be heated to 425 ° C to 500 ° C, and in the case of silicone resin, it may be heated to 520 ° C to 560 ° C.
Further, the object to be treated is one in which the organic polymer material is attached to the penetrating pores, but if it can withstand the treatment temperature, it may be other than metal or ceramic. Also, the form is not limited to a particular one. As a typical example of the object to be treated in which the organic polymer material is attached to the penetrating pores, a used spinneret pack, a spinneret and a spinner filter which are components of the spinneret pack, and the like can be mentioned.

Further, the lidded container is composed of a lid and a container body made of a non-breathable material such as a heat-resistant metal material, and can prevent passage of a fluidized medium and allow only air gas to pass through the bottom of the lid and the container body. A filter is attached, and this filter may be any heat-resistant filter, and various types of filters such as ceramic, stainless steel plate-like, felt-like or non-woven fabric-like can be used. For example, a plurality of materials may be used, such as a combination of a wire mesh and a ceramic sheet.

An example of this is shown in FIG.
Has a ceramic filter 3 fixed to the bottom of the heat-resistant metal container body 2 and the same filter 3 fixed to the heat-resistant metal lid 4, and the lower end of the lid 4 is It is inserted in a seal portion 6 formed by a lid receiver 5 made of a heat-resistant metal fixed near the upper end of the container body 2. The fluid medium stays in this seal portion 6 when immersed in the fluidized bed, and seals the fluid medium.

In the figure, reference numeral 7 denotes a used spinneret pack which is an object to be treated, and the pack 7 is supported by the bottom of the container body 2, that is, is brought into contact with the inner surface of the bottom and is accommodated therein. The spinneret pack 7 includes a female union 8, a male union 9 and a sand 1
0, the spinneret filter 11, the perforated plate 12 and the spinneret 13, and has a pack inlet 14 and a pack outlet 15, but in the spinneret 11 of the spinneret 11, the porous plate 12 and the spinneret 13. Organic polymer material is attached.

Next, the object to be treated is housed in a container with a lid in this way, and then this is dipped in a fluidized bed for processing. At that time, for example, in the case of the container 1 with a lid containing the spinneret pack 7. In step 1, the container body 2 is immersed in a fluidized bed so that the bottom of the container body 2 is located on the lower side. The lidded container may be suspended and directly immersed in the fluidized bed, but in general, it may be immersed in a netted basket through which the fluid medium can pass, and in any case. , To be completely submerged in the fluidized bed.

Thus, the object to be treated such as the immersed spinneret pack is heated by the fluidized bed, and the organic polymer material attached to the pores is thermally decomposed and removed. That is, in the case of the spinneret pack 7, out of the fluidized medium and the air gas heated on the floor, the fluidized medium is prevented from passing by the filter 3 fixed to the container body 2, and only the air gas passes through the pack. It flows into the fine holes 16 of the spinneret 13 through the outlet 15, is further discharged from the pack inlet 14 through the perforated plate 12, the spinner filter 11 and the sand 10, and further passes through the filter 3 fixed to the lid 4. And is discharged to the outside of the container with lid 1 (inside the fluidized bed).

Therefore, the organic polymer material attached to each component is heated and decomposed and removed by this heating gas simple substance flow.
In addition, when the pores 3 of the spinneret 13 are clogged with the attached organic polymer material during the removal, the pyrolysis removal is first performed here, and when the pores are penetrated, the perforated plate arranged in the upper stage. It flows into 12 pores and can be removed by thermal decomposition one after another.

As described above, in the present invention, only the air gas can be forced to flow into the pores, and the organic polymer material attached by this can be swiftly and satisfactorily. It can be removed by thermal decomposition (the effect of air oxidation is remarkable).

That is, to be more specific, since a container with a lid, which is made of a non-breathable material and has a lid and a bottom of the container body, which is equipped with a filter capable of passing only the air gas to prevent passage of the fluid medium, is used. The flow direction can be specified only in the direction in which the lid and the bottom of the container body are opposed to each other. Therefore, when immersed in the fluidized bed, the pressure difference ΔP between the filters is equal to the pressure difference between the filters. When the distance is L and the density of the fluid medium is ρ, ΔP = L × ρ, which means that the fluid medium passes through the entire peripheral wall as disclosed in Japanese Examined Patent Publication (Kokoku) No. 42-18892. Is much larger than that in the case of using a container made of a gas permeable wall that can block gas and allow only gas to pass (double in calculation),
Therefore, by accommodating the object to be processed in contact with or close to the inner surface of the bottom of the container body so that the pores are arranged in the direction in which the lid and the bottom of the container body are opposed (vertical direction),
Air gas can be strongly supplied to the pores, and the organic polymer material attached thereto can be rapidly and satisfactorily removed by thermal decomposition. Specifically, the processing time can be reduced by about 1/2 to 1/5.

In addition, when dipping in a fluidized bed,
In the case of using a container whose entire peripheral wall is formed of a gas permeable wall which prevents passage of a fluid medium and allows only gas to pass, air gas flows into the container from multiple directions as disclosed in Japanese Patent Publication No. Therefore, the air gas flow that should originally flow in the vertical direction is disturbed to locally hinder good fluidization of the fluidized medium, thus making it difficult to uniformly control the temperature of the fluidized bed. In the case of using the attached container, the air gas flow direction can always be maintained in the vertical direction, so that the occurrence of such a problem can be prevented.

Note that FIG. 2 shows an example of accommodating an object to be processed in a container with a lid in proximity to the inner surface of the bottom of the container body 2. In the figure, the object to be processed is shown by a chain line and is placed on a support 17 fixed to the inner surface of the bottom of the container body 2. support
It is preferable that the height of 17 is as low as possible. In Figure 1,
18 indicates a leg.

[Example 1] As shown in Fig. 1, a used spinneret pack 7 having nylon 6 attached to pores 16 and the like was housed in a container 1 with a lid, and the spinneret pack 7 was reticulated. It is housed in a basket and immersed in an electrically heated fluidized bed furnace (alumina is used as the fluid medium and air gas is supplied to the floor) preheated to 470 ° C so that it is completely submerged and treated for 5 hours, then the furnace After taking out from the inside and allowing to cool, the pack was disassembled and inspected, and no residue (poor removal) of deposits was found in all the pores of the spinneret 13, the perforated plate 12, and the spinneret filter 11.

[Example 2] Conditions other than that 10 spinnerets 13 to which nylon 6 was attached were stacked on the inner surface of the bottom of the container body 2 and housed in the container with a lid 1 and treated for 6 hours. When treated under the same conditions as in Example 1, the same results as in Example 1 were obtained.

[Effects of the Invention] As described above, according to the present invention, a method for removing organic matter by a fluidized bed furnace is provided, in which an attached organic polymer material is removed from a processed object having pores such as a used spinneret pack and a spinneret. A suitable method of removal is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a mode in which a spinneret pack 7 which is an object to be processed is housed in a container 1 with a lid, and FIG. 2 is a mode in which an object to be processed is housed in close proximity to an inner bottom surface of a container body 2. FIG. 1 ... container with lid, 2 ... container body, 3 ... filter,
4 ... Lid, 7 ... Spinneret pack (workpiece), 13 ...
Spinneret, 16 ... Pore, 17 ... Support

Claims (1)

[Claims] 1. An organic substance in a fluidized bed furnace in which an object to be treated having an organic polymer material attached to its perforated pores is immersed in a heated fluidized bed to thermally decompose and remove the organic polymer material. In the removal method, in a container with a lid, which is made of a non-air-permeable material, and in which a lid and a bottom of the container body are equipped with a filter that prevents passage of a fluid medium and allows only air gas to pass,
While accommodating the object to be processed in contact with or close to the inner surface of the bottom of the container body so that the pores are arranged in the direction in which the lid and the bottom of the container body are opposed to each other,
A method of removing organic substances by a fluidized bed furnace, which comprises immersing the container body in the fluidized bed so that the bottom of the container body is located on the lower side, and treating it.