JP2004025061A - Fluidizing treatment equipment for powdery material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluidizing treatment equipment for powdery material in which enables a stable operation for a long time with a small pressure loss of a dispersion plate without fall of a powdery material and clogging. <P>SOLUTION: In the fluidizing treatment equipment for powdery material provided with a gas discharge port at the upper part of a vertical container and an introduction port for gas fluidizing the powder at the lower part and further having a feed port and a taking out port for the powder, the above problem is solved by the fluidizing treatment device for powdery material which is characterized in that a rigid structure body and a flexible porous body are provided in combination at a bottom part of a powder accommodation part of the container as a dispersion plate for the gas. <P>COPYRIGHT: (C)2004,JPO

Description

【００３４】
粉状物には平均粒径の異なる２種のアルミナ粉末を用いた。各アルミナを静止層高が１００ｍｍとなるように充填した。加熱空気を流動層内温度４００℃で容器内部の線流速が１０ｃｍ／ｓｅｃとなるよう吹き込み、攪拌翼１２を回転させながら６０分間流動させた。その後、加熱器内から粉末を取り除き分散板の圧力損失を測定した。再度新たな粉末を充填し、同様の操作を行い圧力損失がほぼ一定になった時の数値を使用後の圧力損失とした。試験結果を表１に示す。
【００３５】
【表１】

【００３６】
［実施例２］
上記の流動処理装置１の出口側に有機ハロゲン化合物の熱分解装置と触媒反応装置を直列に配置して図６に示す廃棄物処理装置を作製した。
【００３７】
熱分解装置には、電気ヒータを加熱に用い、電気ヒータが外部に取り付けられた管路をガスが流れることでガスが加熱される方式となっている。
【００３８】
このとき、電気ヒータはガス温度が９００℃になるようにコントロールされ、また９００℃での滞留時間が２ｓｅｃ以上となるように管路の長さが調節されている。
【００３９】
触媒反応装置には、触媒としてシリカ・アルミナ系セラミックス担体に白金を担持させた触媒５０ｌを用いており、担体はハニカム形状をとっている。また、このとき空間速度２０００ｈ^−１となるように触媒量が決められており、触媒温度は４００℃である。
【００４０】
上記の廃棄物処理装置を用いてダイオキシン等で汚染された飛灰を処理した。ダイオキシン等の有害有機物の分析はＪＩＳ　Ｋ　０３１１に従って行った。
【００４１】
飛灰の処理量は１００ｋｇ／ｈで、これを加熱器で４２０℃で６０分間処理した。揮発促進ガスには空気を用いた。加熱器から排出された加熱処理済の飛灰には十分に低い濃度の有害有機物しか検出されなかった。このときの濃度は、０．００４ｎｇ−ＴＥＱ／ｇである。
【００４２】
加熱器からダストフィルタを経由して排出される排ガスを、熱分解装置のみ（Ｉ）、触媒反応装置のみ（ＩＩ）、熱分解装置と触媒反応装置の併用（ＩＩＩ）、の３つの方法で処理した。また、この時汚染濃度の異なる飛灰を用いて、排ガス中のダイオキシン濃度が異なる場合の検討も行った。
【００４３】
排ガスの排出量はいずれも１００Ｎｍ^３／ｈであり、熱分解は９００℃、２秒間で行い、触媒反応は４００℃で行った。
得られた結果を表２に示す。
【００４４】
【表２】

【００４５】
【発明の効果】
本発明により、粉状物の流動処理運転を長期間にわたり安定して行うことができる。
【図面の簡単な説明】
【図１】本発明の一実施例である流動処理装置の構造を示す図である。
【図２】この流動処理装置に用いた分散板の一例の構造を示す図である。
【図３】この流動処理装置に用いた分散板の別例の構造を示す図である。
【図４】この流動処理装置に用いた分散板のさらに別例の構造を示す図である。
【図５】本発明の実施例で用いた流動層モデルの構成を示す図である。
【図６】本発明の実施例で用いた廃棄物処理装置の構成を示す図である。
【符号の説明】
１…流動処理装置
２…縦型容器
３…ガス排出口
４…粉状物の投入口
５…ガス導入口
６…粉状物の取出し口
７…粉状物収容部
８…分散板
８１…柔軟性多孔体
８２…剛性構造体
８３…固定用バー
８４…保護用メッシュ（剛性構造体）
８５…支持体（剛性構造体）
９…空気ボンベ
１０…圧力ゲージ
１１…ヒータ
１２…攪拌翼
１３…集塵器
１４…モータ[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an apparatus for sending gas from a lower part of a vertical container to flow and process powdery material in the container.
[0002]
[Prior art]
2. Description of the Related Art An apparatus for processing a powdery substance by flowing the powdery substance into a vertical container and blowing it from below is widely used for drying and reacting the powdery substance.
[0003]
In this container, a dispersion plate is provided below the powder material to prevent the powder material from falling and to make the gas ejection uniform. As the dispersion plate, a dispersion plate in which many pores are uniformly formed is used.
[0004]
[Problems to be solved by the invention]
If the diameter of the pores of the dispersion plate is large, the powdery material falls through the dispersion plate and drops, while if it is too small, the pressure loss increases and a large-capacity blower is required, and the energy loss also decreases. It becomes a problem. Further, in the case of the intermediate pore diameter, the pores are clogged with a powdery substance, and a long-term stable operation cannot be ensured.
[0005]
An object of the present invention is to provide a powdery material flow treatment apparatus capable of performing stable operation for a long period of time without causing pressure loss of the dispersion plate, falling and clogging of the powdery material.
[0006]
[Means for Solving the Problems]
The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, flexible porous materials such as felt, woven fabric, and nonwoven fabric are unlikely to cause clogging of granular materials, and once granular materials have entered pores. However, it has been found that, due to its flexibility, it can be easily wiped off and stable operation can be continued for a long time. However, as the test was repeated with scale-up, it was found that the strength was insufficient with only the flexible porous body. Therefore, the above object was achieved by supplementing the strength of the flexible porous body by using the rigid structure together.
[0007]
That is, the present invention provides a vertical container having a gas outlet at an upper portion, a gas inlet at a lower portion for flowing a powdery material, and a powdery material having an inlet and an outlet for the powdery material. The present invention relates to a fluid processing apparatus for a powdery material, wherein a rigid structure and a flexible porous body are provided together as a gas dispersion plate at the bottom of the powdery material storage portion of the container.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The vertical container holds a powdery substance and is usually cylindrical. This shape may be a straight cylinder or a different-diameter cylinder having a tapered portion and an upper or lower portion having a shorter diameter. The upper and lower surfaces are usually closed and the whole has a closed structure. The upper and lower surfaces are flat, curved, conical, and the like. Although the volume is designed in accordance with the amount or the like of the powdery material to be processed, is usually 0.01～100M ³ nm, in particular 0.2 to 10 m ³ approximately.
[0009]
The vertical container needs an inlet / outlet for a gas for flowing the powdery material in addition to an inlet / outlet for the powdery material. In order for the gas to flow the powdery material, a gas inlet is provided at the lower part of the container and a gas outlet is provided at the upper part, so that the gas is blown from below the powdery layer stored in the container and escapes upward. To If necessary, a dust removing device such as a dust filter, a cyclone dust collector, and a ceramic filter can be provided at the gas outlet.
[0010]
On the other hand, the inlet and outlet for the powdery material may be provided at any positions as long as the powdery material can be charged and discharged. When the fluidized treatment apparatus of the present invention is an apparatus for heat-treating powdery waste, it is preferable to provide an inlet for the powdery substance at the upper part of the container and a discharge port at the lower part. In batch processing or the like, it is also possible to use both the input port and the output port.
[0011]
A gas dispersion plate is provided on the bottom surface of the powdery material accommodating portion of the vertical container. The present invention is characterized in that a flexible porous body and a rigid structure are used in combination for the dispersion plate.
[0012]
The flexible porous body has a function of dispersing the gas and a function of preventing the particulate matter from falling, and has a through-hole for allowing the gas to pass therethrough and is formed substantially uniformly over substantially the entire surface. The average pore diameter of these pores is about 0.01 to 50 μm, preferably about 0.1 to 20 μm, and is about 1 to 90%, preferably about 1 to 40%, particularly preferably about 1 to 40% of the average particle diameter of the granular material. Those having about 20% are suitable. The porous body has a sheet shape and a thickness of about 1 to 20 mm, preferably about 1 to 5 mm. The flexibility refers to a material that bends to the extent that a load is applied lightly by hand, and that when this porous body is used as a dispersion plate, it vibrates up and down lightly when ventilated. Examples of the flexible porous body include porous felt, woven fabric, and nonwoven fabric made of metal or ceramic. Those generally used for bag filters can be preferably used. Among them, those excellent in heat resistance of 400 ° C. or more, mechanical strength, and corrosion resistance are preferable, and examples thereof include ceramic woven fabric made of Al ₂ O ₃ .SiO ₂ .
[0013]
One purpose of the rigid structure is to supplement the mechanical strength of the flexible porous body. The rigid structure here refers to a material having a strength that does not bend even when a load is applied strongly by hand. The rigid structure may have a function of dispersing gas together with the flexible porous body. In this case, a porous body is used for the rigid structure. Examples include sintered metal powders and porous ceramics. An average pore diameter of about 0.5 to 50 μm, preferably about 0.5 to 20 μm, and a thickness of 1 to 100 mm, preferably about 5 to 20 mm are suitable. The rigid structure may be a simple support of a flexible porous body. In this case, for example, a lattice-like material such as metal or ceramic is used. Alternatively, it can be used as a surface protection material for a flexible porous body. This is because the flexible structure functions to prevent clogging of the dispersion plate, but has low mechanical strength. For example, when a stirring means is provided in addition to the blowing gas as a means for flowing the powder, a stirring blade or the like is used. Damage due to Therefore, a net or mesh is used as the protective layer. The net or mesh to be covered on the surface preferably has an opening (average pore diameter) of about 10 to 100 mm. If the aperture is too small, it causes clogging. If the aperture is too large, the area of the flexible structure exposed in one hole becomes large and the flexible structure is easily broken. The material of the net or mesh is preferably a material having excellent mechanical strength and heat resistance, such as metal and ceramic.
[0014]
There is no particular limitation on the number and order of the flexible porous bodies and the rigid structures in the dispersion plate, and the flexible porous body / rigid structure, the rigid structure / flexible porous body, and the rigid structure / flexible porous body. / A combination of rigid structures and the like can be adopted.
[0015]
Various equipment can be added to the vertical container according to the purpose of processing the powdery material. For example, when heat treatment is performed on powdery waste, a heating means is provided. The heating method may be any of a method of heating from the outer surface of the container, a method of providing a heater inside, and a method of using gas for flowing powdery waste as hot air.
[0016]
Further, it is desirable to provide a stirring means in order to promote the flow of the powdery waste. Thereby, the fluidized bed of the powdery material is formed by the gas blowing from the bottom of the cylindrical container through the dispersion plate and the stirring means by the stirring blade provided in the container, and the powdery material is formed in the layer in the container. Circulates violently, and is excellent in gas-solid contact. Furthermore, when this container is used as a heater, the exchange rate of the powdery material with respect to the inner wall of the heater is high, so that effective heating can be performed in both cases of heating by blowing hot gas and external heating through the inner wall of the heater. Becomes possible. Since the heater having excellent heat transfer efficiency is used, it is not necessary to raise the temperature of the inner wall of the heater excessively even when the fly ash is subjected to the heat treatment, and the fly ash is prevented from sticking to the inner wall. As a result, fly ash can be easily maintained at a high temperature, and stable dioxin removal performance is exhibited. A preferred stirring means is by a stirring blade.
[0017]
The type of the powdery material to be subjected to the flow treatment of the present invention is not particularly limited as long as it can be flowed by an air stream, but the average particle size is about 0.1 to 1000 μm, usually about 1 to 200 μm, preferably about 1 to 50 μm. Is appropriate. The density is about 0.1 to 5 g / ml, usually about 0.5 to 3 g / ml. Specific examples include powdered waste, for example, incineration ash and fly ash discharged from refuse incinerators, those contaminated with organic halogen compounds such as activated carbon that has adsorbed dioxin, etc., generated with water and sewage treatment. Slurry, sludge, organic matter, organic halogen chemistry, sand contaminated with heavy metals, soil, riverbed mud, lake bottom mud, low sea mud, slurry-like waste soil generated at the time of excavation of tunnels, and the like. For example, powdery waste having an organic halogen compound content of about 0.1 to 100 ng-TEQ / g, particularly about 1 to 10 ng-TEQ / g, according to JIS K 0311 can be treated. In particular, when the flow processing target is fine particles having an average particle diameter of less than 10 μm, due to the small particle diameter, the fine particles are clogged in the holes of the dispersion plate, and the pressure loss of the dispersion plate is likely to increase due to repeated operation. . The apparatus of the present invention is particularly effective for the flow treatment of fine particles having an average particle size of less than 10 μm and up to 0.1 μm.
[0018]
The gas used for the flow of the powdery material is also appropriately selected depending on the purpose, but air, incinerator exhaust gas, nitrogen, steam, He, Ar, and the like are usually used.
[0019]
The fluidized processing apparatus of the present invention is provided with appropriate auxiliary equipment according to the processing purpose. For example, in the case where the fluidization treatment involves vaporization and removal of an organic halogen compound accompanied by heating, a device for thermally decomposing the organic halogen compound entrained in the exhaust gas, a device for catalytically decomposing the organic halogen compound, and the like are appropriately provided.
[0020]
In this case, it is preferable to provide a dust removing device at a gas outlet of a heater as a fluid processing device to remove waste and other dust. A bag filter, a cyclone, an electric dust collector, a ceramic filter, and the like can be used for this dust collector. However, since the temperature of the exhaust gas is about 350 to 550 ° C. and this is further heated and thermally decomposed, the preferred one is A ceramic filter or the like that can remove dust at a high temperature is preferable.
[0021]
At the gas outlet of the heater, a gas containing harmful organic halogen compounds discharged from the heater is heated to thermally decompose the harmful organic halogen compounds, or a catalytic reaction to catalytically decompose the harmful organic halogen compounds. Connect the device. The thermal decomposition apparatus has an inlet for a gas that is thermally decomposed in a closed structure and an outlet for a gas that has been thermally decomposed. As the thermal decomposition apparatus, a known apparatus used in a high-temperature combustion deodorizing apparatus or the like can be used. For example, a device using a burner, a device using an electric heater, high-frequency heating, infrared heating, or a waste incinerator High temperature part etc. can be used.
[0022]
The catalytic reactor may be any of a fixed bed type, a moving bed type, and a fluidized bed type. The catalyst is selected according to the type of the harmful organic halogen compound. For example, when decomposing an organic halogen compound such as dioxin, at least one of platinum, palladium, rhodium, ruthenium and other white metal elements or gold is used. A noble metal catalyst, an oxide catalyst such as calcium oxide, manganese, cobalt, chromium, iron, nickel, titanium, vanadium, tungsten and the like, or an oxide catalyst of at least one of composite oxides can be used.
[0023]
The operating conditions of the fluidized treatment apparatus of the present invention vary depending on the treatment purpose. For example, the heating conditions for evaporating and removing the organic halogen compound by heat-treating the powdery waste contaminated with the organic halogen compound are as follows. The average residence time is about 550 ° C, preferably about 400 to 450 ° C, and about 5 to 180 minutes, usually about 30 to 120 minutes. In the heater, which is a fluid processing apparatus, not only the vaporization of the organic halogen compound but also the decomposition may occur.
[0024]
The powdery waste from which organic halogen compounds and the like have been removed by the heater is subjected to secondary treatment as necessary, or is discarded or used as it is.
[0025]
On the other hand, the gas containing the vaporized organic halogen compound is subjected to dust removal by a dust remover if necessary, and then the organic halogen compound is decomposed by a thermal decomposition device or a catalytic reaction device. The thermal decomposition is performed at 800 to 1000 ° C., preferably about 850 to 950 ° C., and the average residence time is about 0.5 to 20 seconds, preferably about 1 to 5 seconds. By this thermal decomposition, about 50 to 95%, preferably about 80 to 95% of the organic halogen compound is decomposed.
[0026]
The catalytic reaction is carried out at 150 to 500 ° C., preferably about 150 to 400 ° C., at a space velocity of 1000 to 10000 h ⁻¹ . By this catalytic reaction, 90% or more, preferably 95% or more of the organic halogen compound is decomposed. The decomposition rate can be further improved by using the thermal decomposition device and the catalytic reaction device together.
[0027]
【Example】
[Example 1]
FIG. 1 shows a schematic configuration of a fluid processing apparatus used in one embodiment of the present invention.
The fluidized processing apparatus 1 has a cylindrical vertical container 2 provided with a gas outlet 3 and a powdery material inlet 4 at an upper portion thereof, and a gas inlet 5 and a powdery material outlet 6 at a lower portion thereof. I have. The powdery substance container 7 is located at the center of the container 2, and a dispersion plate 8 for dispersing the gas is provided at the bottom. A heater 11 for heating the inside of the container 1 is provided on the outer periphery of the container 1, and a stirring blade 12 for stirring the powdery material is provided inside. A dust collector 13 for removing gas is attached to the gas outlet 3. A motor 14 rotates the stirring blade 12.
[0028]
As shown in FIG. 2, the gas dispersion plate 8 is composed of a flexible porous body 81 arranged on the powdery material storage side and a rigid structure 82 having micropores arranged on the bottom side of the container 2. . A fixing bar 83 for fixing the flexible porous body 81 to the periphery of the upper surface and the periphery of the powdery material outlet 6 is attached.
[0029]
Another example of the gas distribution plate 8 is shown in FIG. This gas dispersion plate 8 is the same as that of FIG. 2 except that a protective mesh 84 is provided on the upper surface of a flexible porous body 81.
[0030]
FIG. 4 shows still another example of the gas distribution plate 8. This gas dispersion plate 8 is the same as that of FIG. 3 except that there is no rigid structure 82 having micropores and a support 85 is provided instead.
[0031]
As shown in FIG. 5, an air cylinder 9 and a pressure gauge 10 were attached to the fluid processing apparatus 1 to prepare a fluidized bed model. The pressure gauge 10 measures the differential pressure between the air box below the gas dispersion plate 8 and the space above the fluidized bed of the powder in the powder container 7.
[0032]
Fluidization experiments were performed using the above fluidized bed model. The container 2 was made of SUS and had an inner diameter of 100 mm and an effective height of 600 mm. The following were used for the flexible porous body 81 and the rigid structure 82 or 85, respectively.
[0033]

[0034]
Two types of alumina powders having different average particle diameters were used as the powder. Each alumina was filled so that the height of the stationary layer was 100 mm. Heated air was blown at a temperature in the fluidized bed of 400 ° C. so that the linear flow rate inside the vessel was 10 cm / sec, and the mixture was allowed to flow for 60 minutes while rotating the stirring blade 12. Thereafter, the powder was removed from the heater, and the pressure loss of the dispersion plate was measured. A new powder was charged again, the same operation was performed, and the value when the pressure loss became substantially constant was determined as the pressure loss after use. Table 1 shows the test results.
[0035]
[Table 1]

[0036]
[Example 2]
A waste treatment apparatus shown in FIG. 6 was prepared by arranging an organic halogen compound thermal decomposition apparatus and a catalytic reaction apparatus in series at the outlet side of the fluid treatment apparatus 1.
[0037]
The pyrolysis apparatus employs a method in which an electric heater is used for heating, and the gas is heated by flowing the gas through a pipe in which the electric heater is mounted outside.
[0038]
At this time, the electric heater is controlled so that the gas temperature becomes 900 ° C., and the length of the conduit is adjusted so that the residence time at 900 ° C. becomes 2 sec or more.
[0039]
The catalyst reaction apparatus uses a catalyst 50 l in which platinum is supported on a silica-alumina ceramic carrier as a catalyst, and the carrier has a honeycomb shape. At this time, the amount of the catalyst is determined so that the space velocity becomes 2000 h ⁻¹ , and the catalyst temperature is 400 ° C.
[0040]
Fly ash contaminated with dioxin or the like was treated using the above waste treatment apparatus. Analysis of harmful organic substances such as dioxin was performed according to JIS K 0311.
[0041]
The processing amount of fly ash was 100 kg / h, which was treated with a heater at 420 ° C. for 60 minutes. Air was used as the volatilization promoting gas. Only a sufficiently low concentration of harmful organic substances was detected in the heat-treated fly ash discharged from the heater. The concentration at this time is 0.004 ng-TEQ / g.
[0042]
Exhaust gas discharged from the heater via the dust filter is treated by three methods: only the thermal decomposition unit (I), only the catalytic reactor (II), and the combined use of the thermal decomposition unit and the catalytic reactor (III). did. At this time, using fly ash with different contaminant concentration, the case where dioxin concentration in exhaust gas was different was also examined.
[0043]
The exhaust gas emissions were all 100 Nm ³ / h, thermal decomposition was performed at 900 ° C. for 2 seconds, and catalytic reaction was performed at 400 ° C.
Table 2 shows the obtained results.
[0044]
[Table 2]

[0045]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the flow processing operation | movement of a powdery substance can be performed stably over a long period of time.
[Brief description of the drawings]
FIG. 1 is a diagram showing the structure of a fluid processing apparatus according to one embodiment of the present invention.
FIG. 2 is a diagram illustrating a structure of an example of a dispersion plate used in the fluid processing apparatus.
FIG. 3 is a view showing the structure of another example of the dispersion plate used in the fluid processing apparatus.
FIG. 4 is a view showing the structure of still another example of the dispersion plate used in the fluid processing apparatus.
FIG. 5 is a diagram showing a configuration of a fluidized bed model used in an example of the present invention.
FIG. 6 is a diagram showing a configuration of a waste disposal apparatus used in an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fluid processing apparatus 2 ... Vertical container 3 ... Gas discharge port 4 ... Powder inlet 5 ... Gas inlet 6 ... Powder outlet 7 ... Powder holder 8 ... Dispersion plate 81 ... Flexible Porous body 82 ... rigid structure 83 ... fixing bar 84 ... protective mesh (rigid structure)
85 ... Support (rigid structure)
9 air cylinder 10 pressure gauge 11 heater 12 stirring blade 13 dust collector 14 motor

[0007]
That is, the present invention has a gas outlet and a powdery material inlet at the top of the vertical container, a gas inlet and a powdery material outlet at the bottom at the bottom, and further has a powdery material outlet inside. In a fluidized fluid heat treatment apparatus having a stirring means and a heating means on the outer periphery, a rigid structure and a flexible porous body are provided as a dispersion plate of the gas at the bottom of the powdery material accommodating portion of the container. The present invention relates to a fluidized heat treatment apparatus for a powdery material.

[0009]
The vertical container needs an inlet / outlet for a gas for flowing the powdery material in addition to an inlet / outlet for the powdery material. Gas is provided with a gas inlet at the bottom of the container and a gas outlet at the top to make the powder flow, so that gas can be blown from below the powder layer contained in the container and escape upward. To If necessary, a dust removing device such as a dust filter, a cyclone dust collector, and a ceramic filter can be provided at the gas outlet.

[0010]
On the other hand, the inlet and outlet for the powdery material may be provided at any positions as long as the powdery material can be charged and discharged. In the case where the fluidized treatment apparatus of the present invention is an apparatus for heat-treating powdery waste, it is preferable to provide a powdery substance inlet at the top of the container and a discharge port at the bottom. In batch processing or the like, it is also possible to use both the input port and the output port.

[0013]
One purpose of the rigid structure is to supplement the mechanical strength of the flexible porous body. The rigid structure here refers to a material having a strength that does not bend even when a load is applied strongly by hand. The rigid structure may have a function of dispersing gas together with the flexible porous body. In this case, a porous body is used for the rigid structure. Examples include sintered metal powders and porous ceramics. An average pore diameter of about 0.5 to 50 μm, preferably about 0.5 to 20 μm, and a thickness of 1 to 100 mm, preferably about 5 to 20 mm are suitable. The rigid structure may be a simple support of a flexible porous body. In this case, for example, a lattice-like material such as metal or ceramic is used. Alternatively, it can be used as a surface protection material for a flexible porous body. This is because the flexible porous material functions to prevent clogging of the dispersion plate, but has low mechanical strength. For example, when a stirring means is provided in addition to the blowing gas as a means for flowing the powder, a stirring blade or the like is used. Damage due to Therefore, a net or mesh is used as the protective layer. The net or mesh to be covered on the surface preferably has an opening (average pore diameter) of about 10 to 100 mm. If the aperture is too small, it causes clogging. If the aperture is too large, the area of the flexible structure exposed in one hole becomes large and the flexible structure is easily broken. The material of the net or mesh is preferably a material having excellent mechanical strength and heat resistance, such as metal and ceramic.

[0027]
【Example】
[Example 1]
FIG. 1 shows a schematic configuration of a fluid processing apparatus used in one embodiment of the present invention.
The fluid treatment apparatus 1 has a gas outlet 3 and a powder inlet 4 at the top of a cylindrical vertical container 2, and a gas inlet 5 and a powder outlet 6 at the bottom. I have. The powdery substance container 7 is located at the center of the container 2, and a dispersion plate 8 for dispersing the gas is provided at the bottom. A heater 11 for heating the inside of the container 1 is provided on the outer periphery of the container 1, and a stirring blade 12 for stirring the powdery material is provided inside. A dust collector 13 for removing gas is attached to the gas outlet 3. A motor 14 rotates the stirring blade 12.

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for sending gas from the lower part of a vertical container to flow and treat powdery waste in the container.

[0005]
An object of the present invention is to provide a powdery waste fluid treatment apparatus capable of performing stable operation for a long period of time without causing pressure loss of the dispersion plate, falling and clogging of the powdery material.

[0007]
That is, the present invention has a gas outlet and a powdery material inlet at the top of the vertical container, a gas inlet and a powdery material outlet at the bottom at the bottom, and further has a powdery material outlet inside. In a fluidized fluid heat treatment apparatus having a stirring means and a heating means on the outer peripheral portion, an average of a felt, a woven cloth, a nonwoven cloth, etc., as a gas dispersion plate at the bottom of the powdery substance storage portion of the container. Flow heating of powdered waste such as incineration ash and fly ash discharged from a refuse incinerator, characterized by having a flexible porous body having a pore diameter of 0.1 to 20 μm and a rigid structure supporting the same. The present invention relates to a processing device.

[0012]
The flexible porous body has a function of dispersing the gas and a function of preventing the particulate matter from falling, and has a through-hole for allowing the gas to pass therethrough and is formed substantially uniformly over substantially the entire surface. The average pore diameter of these pores is about 0.1 to 20 μm, and about 1 to 90%, preferably about 1 to 40%, particularly preferably about 1 to 20% of the average particle diameter of the granular material is appropriate. is there. The porous body has a sheet shape and a thickness of about 1 to 20 mm, preferably about 1 to 5 mm. The flexibility refers to a material that bends to the extent that a load is applied lightly by hand, and that when this porous body is used as a dispersion plate, it vibrates up and down lightly when ventilated. Examples of the flexible porous body include porous felt, woven fabric, and nonwoven fabric made of metal or ceramic. Those generally used for bag filters can be suitably used. Among them, those excellent in heat resistance of 400 ° C. or more, mechanical strength, and corrosion resistance are preferable, and examples thereof include ceramic woven fabric made of Al ₂ O ₃ .SiO ₂ .

[0017]
The powdery waste to be fluidized according to the present invention preferably has an average particle size of about 1 to 50 μm. The density is about 0.1 to 5 g / ml, usually about 0.5 to 3 g / ml. Specific examples include powdery waste, for example, incineration ash and fly ash discharged from a refuse incinerator, and those contaminated with an organic halogen compound such as activated carbon adsorbing dioxin and the like. For example, the content of organic halogen compounds in powdery waste is JIS
According to the measuring method according to K0311, about 0.1 to 100 ng-TEQ / g, particularly about 1 to 10 ng-TEQ / g can be treated. In particular, when the flow processing target is fine particles having an average particle diameter of less than 10 μm, due to the small particle diameter, the fine particles are clogged in the holes of the dispersion plate, and the pressure loss of the dispersion plate is likely to increase due to repeated operation. . The apparatus of the present invention is particularly effective for the flow treatment of fine particles having an average particle size of less than 10 μm and up to 0.1 μm.

[0036]
A waste treatment apparatus shown in FIG. 6 was prepared by arranging an organic halogen compound thermal decomposition apparatus and a catalytic reaction apparatus in series at the outlet side of the fluid treatment apparatus 1.

[0007]
That is, the present invention has a gas outlet and a powdery material inlet at the top of the vertical container, a gas inlet and a powdery material outlet at the bottom at the bottom, and further has a powdery material outlet inside. In a fluidized fluid heat treatment apparatus having a stirring means and a heating means on the outer peripheral portion, an average of a felt, a woven cloth, a nonwoven cloth, etc., as a gas dispersion plate at the bottom of the powdery substance storage portion of the container. A powdered waste such as incinerated ash or fly ash discharged from a refuse incinerator, which is provided with a flexible porous body having a pore size of 0.1 to 20 μm and a rigid structure for supplementing its mechanical strength. The present invention relates to a fluidized heat treatment apparatus.

Claims (7)

A vertical container provided with a gas outlet at an upper portion thereof, a gas inlet at a lower portion thereof for introducing a gas to flow the powdery material, and a powdery material flow treatment apparatus having a powdery material input port and a powdery material outlet; Characterized in that a rigid structure and a flexible porous body are provided together as a gas dispersion plate at the bottom of a powdery material storage portion of the present invention. 2. The powdery fluid processing apparatus according to claim 1, wherein the rigid structure has fine holes. The powdery material flow treatment device according to claim 1 or 2, wherein a surface of the dispersion plate in contact with the powdery material is formed of a flexible porous body. 4. A powdery fluid processing apparatus according to claim 3, wherein a rigid mesh is coated on an upper surface of the flexible porous body. The apparatus according to any one of claims 1 to 4, wherein the flexible porous body is formed of ceramic or metal fibers. 6. A detoxifying apparatus for detoxifying a gas discharged from the gas discharge port, wherein the detoxifying apparatus is an apparatus using an organic halogen compound decomposition catalyst. Item 2. An apparatus for treating powdery substances according to item 6. The detoxifying apparatus for detoxifying a gas discharged from the gas discharge port, the detoxifying apparatus being a thermal decomposition apparatus for an organic halogen compound. Powder processing equipment described in

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