JP2008245855A - Method and equipment to supply fusion furnace with waste asbestos - Google Patents

Method and equipment to supply fusion furnace with waste asbestos Download PDF

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JP2008245855A
JP2008245855A JP2007089896A JP2007089896A JP2008245855A JP 2008245855 A JP2008245855 A JP 2008245855A JP 2007089896 A JP2007089896 A JP 2007089896A JP 2007089896 A JP2007089896 A JP 2007089896A JP 2008245855 A JP2008245855 A JP 2008245855A
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waste
asbestos
melting furnace
charging
waste asbestos
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JP4540686B2 (en
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Hatsuyoshi Kamishiro
初義 神代
Noriaki Izumi
憲明 和泉
Hideki Hasegawa
英樹 長谷川
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Kawasaki Plant Systems Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and equipment to supply a fusion furnace with waste materials including asbestos packed in bags and transported to disposal facilities, where they are efficiently fused at a high temperature of about 1,500°C and made harmless. <P>SOLUTION: Waste asbestos 12 packed in bags is supplied into a tapered screw feeder 7 provided within a feeder 1, while Na<SB>2</SB>CO<SB>3</SB>and SiO<SB>2</SB>are supplied from an auxiliary material supplier 5. The screw feeder 7 crushes the packing bags, mixes together and compresses waste asbestos and the auxiliary materials, and continuously supplies them to the fusion furnace 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、溶融炉に溶融する材料を投入する方法および装置に関し、特にアスベストを溶融無害化処理する溶融炉に廃石綿を含む廃棄物を投入する廃石綿投入方法および装置に関する。   The present invention relates to a method and apparatus for charging a material to be melted into a melting furnace, and more particularly, to a waste asbestos charging method and apparatus for charging waste containing asbestos into a melting furnace for melting and detoxifying asbestos.

アスベストは、その高い耐熱性や断熱性、絶縁性、扱いやすい機械的特性などのため建造物や自動車部品、家庭内機器などに広く利用されてきた。しかし、アスベストは、その結晶形態が非常に細かい繊維状であるため飛散しやすく、飛散した微細結晶を吸入することにより、長い潜伏期間を経て中皮腫や肺ガンを引き起こすため非常に危険視され、その使用が大幅に制限されるようになった。これにより、突如、膨大な量のアスベストが廃棄物として処理業者に持ち込まれる様になった。   Asbestos has been widely used in buildings, automobile parts, household equipment, etc. due to its high heat resistance, heat insulation, insulation, and easy-to-handle mechanical properties. However, asbestos is easy to scatter because its crystalline form is very fine fibers, and inhalation of the scattered fine crystals causes mesothelioma and lung cancer after a long incubation period. , Its use has been greatly restricted. Suddenly, an enormous amount of asbestos was brought into the processing company as waste.

しかし、アスベストの廃棄に際しては有害物質として認定施設で適切に取り扱われなければならない。例えば埋め立て処分する際は耐水性の袋で二重に梱包し管理型の最終処分場に埋め立てるよう規定されている。したがって、限りある処分場の利用を節約し、廃棄コストが嵩むことによる不法投棄の横行を回避するため、アスベスト無害化処理施設の整備が急務になっている。   However, when asbestos is disposed of, it must be properly handled in a certified facility as a hazardous substance. For example, when landfilling, it is stipulated that it is double-packed in water-resistant bags and landed in a managed final disposal site. Therefore, there is an urgent need to establish an asbestos detoxification facility in order to save on the use of limited disposal sites and to avoid rampant illegal dumping due to increased disposal costs.

アスベストは、1500℃程度の高温で処理することにより、溶融してその微細繊維状の結晶形態を失い、無害化する。そこで、耐水性の袋で梱包されて搬入されたアスベスト廃棄物を、産業廃棄物や下水汚泥等を溶融処理するために使用されている溶融炉を応用し、構造物から解体されたアスベストを含む構造物廃棄物を高温で溶融して無害化処理することが考案されている。   Asbestos is melted and loses its fine fibrous crystal form by being treated at a high temperature of about 1500 ° C., thereby rendering it harmless. Therefore, asbestos waste packed in water-resistant bags and carried in is applied to melting furnaces used to melt industrial waste and sewage sludge, etc., and contains asbestos dismantled from structures It has been devised to detoxify structural waste by melting it at a high temperature.

特許文献1には、排出工場から排出される廃石綿等、または石綿除去工事によって発生する廃石綿等を2重に袋詰めして搬入し、開封せずにそのまま電気抵抗式溶融炉に投入して溶融処理し無害化する廃石綿等の処理工法が開示されている。   In Patent Document 1, waste asbestos discharged from the discharge factory, or waste asbestos generated by the asbestos removal work is double-packed and brought into the electric resistance melting furnace without opening. Disclosed is a treatment method for waste asbestos that is melted and rendered harmless.

しかし、1500℃程度の高温に熱せられた雰囲気にポリエチレン製等の袋に詰められた廃石綿等を投入すると、ポリエチレン製の袋がスラグに着水する前に蒸散し、廃アスベストが空中で開放されてその飛散性の微細結晶を雰囲気中に放出してしまう。したがって、溶融炉が排出する排ガスに有害なアスベストの結晶が含まれ、排ガスを厳重に処理しなければならなくなるため、排ガス処理設備が大型化してコストが嵩む。
また、工場や工事現場から搬送された廃石綿は、モルタル等に付着して塊状になっているため、そのまま溶融炉に投入すると、溶融に時間が掛かり、処理効率が上がらない問題があった。
However, when waste asbestos packed in polyethylene bags is put in an atmosphere heated to a high temperature of about 1500 ° C, the polyethylene bags evaporate before landing on the slag, and the waste asbestos is opened in the air. As a result, the scattering fine crystals are released into the atmosphere. Therefore, harmful asbestos crystals are contained in the exhaust gas discharged from the melting furnace, and the exhaust gas must be treated strictly, so that the exhaust gas treatment facility is increased in size and costs are increased.
In addition, waste asbestos transported from factories and construction sites adheres to mortar and is agglomerated, so if it is put into a melting furnace as it is, it takes time to melt and processing efficiency does not increase.

特許文献2には、石綿を含む廃棄物原料を低温燃焼により減容させて、ガラス粉と粘土を混練し、型に入れて1000〜1300℃程度の加熱温度で焼結あるいは溶融して、石綿繊維を溶融して無害化すると共にガラスなどに封じ込めて、建材用煉瓦などに再生する方法が開示されている。
特許文献2の方法は、元の石綿に対してガラスや粘土を加えて増量するため、再生利用ができなかったときには廃棄物が増えて処理負担がかえって増加する危険がある。
特開平10−337547号公報 特開平08−187482号公報
In Patent Document 2, waste materials containing asbestos are reduced in volume by low-temperature combustion, glass powder and clay are kneaded, put into a mold, sintered or melted at a heating temperature of about 1000 to 1300 ° C., and asbestos. A method of melting and detoxifying fibers and enclosing them in glass or the like and regenerating them into bricks for building materials is disclosed.
The method of Patent Document 2 increases the amount of glass by adding glass or clay to the original asbestos, and there is a risk that the waste increases and the processing burden increases when it cannot be recycled.
JP-A-10-337547 Japanese Patent Laid-Open No. 08-187482

そこで、本発明が解決しようとする課題は、アスベストを含む廃棄物を1500℃程度の高温により溶融無害化する処理設備において、袋詰めされて搬入される廃棄物を効率的に溶融するための溶融炉への廃石綿投入方法および装置を提供することである。   Therefore, the problem to be solved by the present invention is to melt waste for efficiently melting waste that is packed in a bag in a processing facility for melting and detoxifying waste containing asbestos at a high temperature of about 1500 ° C. It is to provide a method and apparatus for charging waste asbestos into a furnace.

上記課題を解決するため、本発明の溶融炉への廃石綿投入装置は、溶融炉に廃棄物を投入する装置であって、耐水性の袋に詰められた廃棄物を2重シールゲートを介して受け入れる受入口、耐水性の袋を破砕する破砕装置、廃棄物を圧縮する圧縮装置および廃棄物を連続的に溶融炉に排出する繰り出し装置を備えることを特徴とする。   In order to solve the above-mentioned problems, a waste asbestos input device for a melting furnace according to the present invention is a device for inputting waste into a melting furnace, and the waste packed in a water-resistant bag is passed through a double seal gate. A receiving port, a crushing device for crushing a water-resistant bag, a compression device for compressing waste, and a feeding device for continuously discharging waste to a melting furnace.

本発明の廃石綿投入装置は、装置内の気密を確保して運転される。受入口から、ポリエチレン製等の袋に詰められた廃石綿が投入されると、破砕装置により袋が破砕され、圧縮装置により小塊ごとに適度に圧縮され、繰り出し装置により溶融炉に排出される。   The waste asbestos injection device of the present invention is operated while ensuring airtightness in the device. When waste asbestos packed in a bag made of polyethylene or the like is introduced from the receiving port, the bag is crushed by the crushing device, compressed into small chunks by the compression device, and discharged to the melting furnace by the feeding device. .

圧縮装置、繰り出し装置は、進行方向に狭窄するテーパを設けたスクリュフィーダとして備わるのが最適である。スクリュフィーダのスクリュには、肌面に針状や鋸歯状の破砕装置を突設する。受入口から廃石綿が投入されると、常時回転しているスクリュに備わった破砕装置により袋が破られ、廃石綿の分布が均されながら進行方向に搬送される。スクリュフィーダがテーパにより狭窄していくため、廃石綿が進行に従って徐々に圧縮され、フィーダの出口から適度に塊化された形で溶融炉に排出される。   The compression device and the feeding device are optimally provided as a screw feeder provided with a taper that narrows in the traveling direction. The screw of the screw feeder is provided with a needle-like or serrated crushing device on the skin surface. When waste asbestos is introduced from the receiving port, the bag is broken by the crushing device provided in the screw that is always rotating, and the waste asbestos is transported in the traveling direction while leveling the distribution of the waste asbestos. Since the screw feeder is narrowed by the taper, the waste asbestos is gradually compressed as it progresses, and is discharged into the melting furnace in an appropriately agglomerated form from the feeder outlet.

本発明の廃石綿投入装置によれば、廃石綿を適度に圧縮された小型の塊として連続的に溶融炉に投入することができる。したがって、廃石綿が塊状のまま溶融スラグに着水するため、投入時にアスベストの有害な微細結晶を溶融炉の雰囲気中に放出されるのを防止することができる。また、廃石綿を袋詰めされたまま投入してバッチ処理を行う場合に比べて処理速度が向上し、溶融処理の制御も容易になる。   According to the waste asbestos input device of the present invention, it is possible to continuously input waste asbestos into a melting furnace as a small lump that is appropriately compressed. Therefore, since the waste asbestos lands on the molten slag in a lump form, harmful fine crystals of asbestos can be prevented from being released into the melting furnace atmosphere at the time of charging. In addition, the processing speed is improved compared to the case where batch processing is performed by putting waste asbestos in a bag and control of the melting process is facilitated.

さらに、本発明の廃石綿投入装置は、副材料を添加する副材料投入装置、副材料と廃棄物を混合する混練装置を備えることができる。副材料投入装置は、一般的なフィーダでよい。廃石綿の投入と同時もしくは投入の前後に副材料を投入し、破砕装置で袋を破砕したのち、混練装置で廃石綿と副材料を混練して溶融炉に投入する。副材料を投入することで、廃石綿の溶融を促進したり、溶融スラグの性状を安定させることができる。   Furthermore, the waste asbestos input device of the present invention can include an auxiliary material input device for adding an auxiliary material, and a kneading device for mixing the auxiliary material and waste. The auxiliary material input device may be a general feeder. At the same time as or before or after the introduction of the waste asbestos, the auxiliary material is added and the bag is crushed by the crushing device. Then, the waste asbestos and the auxiliary material are kneaded by the kneading device and put into the melting furnace. By introducing the auxiliary material, melting of waste asbestos can be promoted and the properties of the molten slag can be stabilized.

混練装置は、ミキサ等を別途備えてもよいが、スクリュフィーダを混練装置として利用すると、スクリュフィーダが破袋、混練、圧縮、繰り出しを行うため、装置が非常に簡易になる。   The kneading apparatus may be provided with a mixer or the like separately. However, when the screw feeder is used as the kneading apparatus, the screw feeder performs bag breaking, kneading, compression, and feeding, so that the apparatus becomes very simple.

副材料には、例えばソーダ灰と呼ばれる炭酸ナトリウム(NaCO)を使用するとよい。廃石綿に適量の炭酸ナトリウムを混練し、圧縮して塊状として溶融炉に投入すると、溶融炉の高熱により炭酸ナトリウムが溶融して炭酸ガスを放出する。この炭酸ガスの放出による圧力が投入物の塊状の形態を崩壊させ、投入物の表面積が増して、溶融速度が著しく向上する。 As the auxiliary material, for example, sodium carbonate (Na 2 CO 3 ) called soda ash may be used. When an appropriate amount of sodium carbonate is kneaded with waste asbestos, compressed and put into a lump as a lump, the sodium carbonate is melted by the high heat of the melting furnace and carbon dioxide gas is released. The pressure due to the release of the carbon dioxide gas collapses the bulk form of the charge, increases the surface area of the charge, and remarkably improves the melting rate.

また、副材料として、ケイ砂などの形で二酸化ケイ素(SiO)を添加してもよい。廃石綿は炭酸カルシウム(CaCO)を多量に含んでおり、溶解した場合、溶融温度(1200〜1500℃)の変化に対し粘度が大きく変動する。このため、溶解後のスラグを排出する場合に、スラグの温度変化に対し粘度が急激に変化し、コントロールが難しい問題があった。 Further, silicon dioxide (SiO 2 ) may be added as a secondary material in the form of silica sand or the like. Waste asbestos contains a large amount of calcium carbonate (CaCO 3 ), and when dissolved, the viscosity varies greatly with changes in melting temperature (1200 to 1500 ° C.). For this reason, when discharging | discharging slag after melt | dissolution, the viscosity changed rapidly with respect to the temperature change of slag, and there existed a problem that control was difficult.

しかし、炭酸ナトリウムと二酸化ケイ素もしくはその一方を添加することで、スラグの温度に対して粘度の変動を小さくすることができる。このため、スラグの温度が変化しても一定の粘度が確保でき、スラグの排出制御が容易となる。   However, by adding sodium carbonate and / or silicon dioxide, it is possible to reduce the variation in viscosity with respect to the slag temperature. For this reason, even if the temperature of the slag changes, a certain viscosity can be secured, and the slag discharge control becomes easy.

したがって、溶融炉からのスラグの排出制御をスムーズに行うために、副材料として炭酸ナトリウムと二酸化ケイ素を同時に投入することが望ましい。
これら副材料は、溶融炉に投入される前に、廃石綿とよく混ざっていることが好ましい。本発明では、袋を破砕して廃棄物を露出させたところに副材料を加えて混練するので、廃石綿と副材料は十分に混ざり、炭酸ガスの発生に伴い塊が細かく崩れて効果的に溶融させることができる。
Therefore, in order to smoothly control the discharge of slag from the melting furnace, it is desirable to simultaneously add sodium carbonate and silicon dioxide as auxiliary materials.
These secondary materials are preferably mixed well with waste asbestos before being put into the melting furnace. In the present invention, the auxiliary material is added and kneaded where the waste is exposed by crushing the bag, so that the waste asbestos and the auxiliary material are sufficiently mixed, and the lump is effectively broken down effectively with the generation of carbon dioxide gas. Can be melted.

以下、本発明について実施例に基づき図面を参照して詳細に説明する。
図1は本実施例における溶融炉への廃石綿投入装置の概略図である。供給装置1の上方に2重のシールゲート2を介して投入口3が位置しており、投入口3の上方に搬入コンベヤ4が設置されている。供給装置1には側面に副材料供給装置5が備わり、上部に水スプレー6が設置されている。供給装置1の内部には下流に向けて狭窄するテーパが設けられたスクリュフィーダ7が据えられ、スクリュフィーダ7の羽根の肌面に鋸歯状の刃が突設されている。スクリュフィーダ7の下流には配送管8が接続され、配送管8はロータリーバルブ9、シールゲート10を介して溶融炉11の投入口に接続している。
Hereinafter, the present invention will be described in detail based on examples with reference to the drawings.
FIG. 1 is a schematic view of an apparatus for charging waste asbestos into a melting furnace in the present embodiment. An input port 3 is located above the supply device 1 via a double seal gate 2, and a carry-in conveyor 4 is installed above the input port 3. The supply device 1 is provided with a sub-material supply device 5 on the side surface, and a water spray 6 is installed on the top. A screw feeder 7 provided with a taper that narrows toward the downstream is installed inside the supply device 1, and a saw-toothed blade projects from the skin surface of the blade of the screw feeder 7. A delivery pipe 8 is connected downstream of the screw feeder 7, and the delivery pipe 8 is connected to a charging port of the melting furnace 11 through a rotary valve 9 and a seal gate 10.

廃石綿の溶融炉は、プラズマ電極により溶湯表面中央部に3000〜5000℃のプラズマ領域を発生させて、この高温領域に廃石綿を供給して溶融させるプラズマ溶融炉である。溶融炉内は、アスベストの微細結晶を含有する可能性のあるガスが大気に開放されることを防ぐため、負圧下で運転される。本実施例の廃石綿投入装置は、負圧下の溶融炉に材料を投入するため、2重のシールゲート2を用いて大気圧下の搬入コンベア4に直接開口しないようにして、装置全体を気密にして運転する。なお、本発明の廃石綿投入装置は、プラズマ溶融炉の他、燃焼炉、電気抵抗炉等、各種の溶融炉に適用することができる。   The waste asbestos melting furnace is a plasma melting furnace in which a plasma region of 3000 to 5000 ° C. is generated at the center of the molten metal surface by a plasma electrode, and the waste asbestos is supplied and melted in this high temperature region. The melting furnace is operated under negative pressure in order to prevent the gas that may contain fine crystals of asbestos from being released to the atmosphere. Since the waste asbestos charging apparatus of this embodiment is charged with a material in a melting furnace under a negative pressure, the double seal gate 2 is used so that it does not directly open into the carry-in conveyor 4 under the atmospheric pressure, and the entire apparatus is hermetically sealed. And drive. In addition, the waste asbestos injection device of the present invention can be applied to various melting furnaces such as a combustion furnace and an electric resistance furnace in addition to a plasma melting furnace.

搬入コンベヤ4により装置に搬入された廃石綿12は、ポリエチレン製等の袋に梱包されたまま投入口3に投入される。投入された廃石綿12は、シールゲート2に受けられ、1個ずつ供給装置1に導入される。同時に、副材料供給装置5から定量の炭酸ナトリウム(NaCO)と二酸化ケイ素(SiO)が供給される。なお、炭酸ナトリウムと二酸化ケイ素は、それぞれ、それらを主成分とするソーダ灰とケイ砂として供給しても良い。 The waste asbestos 12 carried into the apparatus by the carry-in conveyor 4 is put into the inlet 3 while being packed in a bag made of polyethylene or the like. The introduced asbestos 12 is received by the seal gate 2 and introduced into the supply device 1 one by one. At the same time, fixed amounts of sodium carbonate (Na 2 CO 3 ) and silicon dioxide (SiO 2 ) are supplied from the auxiliary material supply device 5. In addition, you may supply sodium carbonate and silicon dioxide as soda ash and silica sand which have them as a main component, respectively.

廃石綿12は、回転しているスクリュフィーダ7内に投入され、スクリュフィーダ7に備わる刃で袋を破砕される。その後、スクリュフィーダ7の回転運動により、副材料として供給された炭酸ナトリウムおよび二酸化ケイ素と混練されながら下流に搬送される。スクリュフィーダ7は下流に向けて狭窄しているため、廃石綿12は搬送に従って副材料とともに徐々に圧縮されて塊状になり、配送管8に搾り出される。スクリュフィーダ7の作用により、1袋ずつ投入された廃石綿が均され、連続的に排出される。配送管8に搾り出された廃石綿は、配送管8内を落下してロータリーバルブ9に受けられ、順次溶融炉11に投入される。   The waste asbestos 12 is put into the rotating screw feeder 7, and the bag is crushed with a blade provided in the screw feeder 7. Thereafter, the screw feeder 7 is conveyed downstream by being kneaded with sodium carbonate and silicon dioxide supplied as auxiliary materials by the rotational movement of the screw feeder 7. Since the screw feeder 7 is narrowed toward the downstream side, the waste asbestos 12 is gradually compressed together with the auxiliary material in accordance with the conveyance to form a lump and is squeezed out to the delivery pipe 8. As a result of the action of the screw feeder 7, the waste asbestos put in one bag at a time is leveled and continuously discharged. The waste asbestos squeezed into the delivery pipe 8 falls in the delivery pipe 8 and is received by the rotary valve 9, and sequentially put into the melting furnace 11.

なお、石綿の除去工事の際に、粉塵の飛散を防ぐために水を掛けながら構造物から廃石綿を剥がすため、廃石綿12は水を含んでいる。しかし、副材料と混練するための水分が不足する場合は、水スプレー6から水を供給して運転する。   In the removal work of asbestos, the waste asbestos 12 contains water in order to peel off the waste asbestos from the structure while applying water to prevent scattering of dust. However, when water for kneading with the auxiliary material is insufficient, water is supplied from the water spray 6 to operate.

本実施例の廃石綿投入装置により溶融炉に投入される廃石綿は適度な水分が含まれるため、副材料とともに練られてスクリュフィーダ7の排出口から塊状で供給され、溶融炉11の激しい気流にも煽られず、飛散することなく塊状のままスラグに着水する。したがって、雰囲気中にアスベストの微細結晶が放出されにくく、雰囲気をクリーンに保つことができる。そのため、溶融炉から排出される排ガスを処理して石綿を除去する除塵装置を簡素化することができ、処理コストを節約することができる。   Since the waste asbestos introduced into the melting furnace by the waste asbestos input device of the present embodiment contains moderate moisture, it is kneaded with the auxiliary material and supplied in a lump form from the outlet of the screw feeder 7, and the intense air current in the melting furnace 11 The slag will land on the slag without splashing. Therefore, the asbestos fine crystals are not easily released into the atmosphere, and the atmosphere can be kept clean. Therefore, it is possible to simplify the dust removing device that processes the exhaust gas discharged from the melting furnace and removes asbestos, and saves processing costs.

また、着水後、高温に熱せられて溶融が開始するが、溶融初期に、副材料として添加した炭酸ナトリウムが化学的に分解して炭酸ガスを発生し、その圧力で塊状の形態が崩壊して、溶融物の表面積が増し、溶融が速やかに進む。したがって、溶融炉の処理能力が向上し、運転効率が改善する。   In addition, after landing, it is heated to a high temperature to start melting, but at the beginning of melting, sodium carbonate added as an auxiliary material is chemically decomposed to generate carbon dioxide gas, and the massive form collapses at that pressure. As a result, the surface area of the melt increases and the melting proceeds rapidly. Therefore, the processing capacity of the melting furnace is improved and the operation efficiency is improved.

さらに、廃石綿と副材料が完全に溶融するとスラグに同化するが、副材料として炭酸ナトリウムと二酸化ケイ素を添加した効果により、スラグの温度が変化してもスラグの粘度が一定の範囲内に保たれる。したがって、溶融炉からスラグを排出する際に排出ノズル等にスラグが固着することを防ぐことができ、スラグの排出量が安定するとともにノズルを保温するための加熱装置を省略もしくは簡素化することができる。   Furthermore, when waste asbestos and secondary materials are completely melted, they are assimilated into slag, but due to the effect of adding sodium carbonate and silicon dioxide as secondary materials, the slag viscosity remains within a certain range even when the slag temperature changes. Be drunk. Therefore, when discharging the slag from the melting furnace, it is possible to prevent the slag from adhering to the discharge nozzle, etc., and the discharge amount of the slag can be stabilized and the heating device for keeping the nozzle warm can be omitted or simplified. it can.

図2は、アスベストに補助材としてソーダ灰NaCOとケイ砂SiOを添加した場合の温度変化に対するスラグ粘度の変化を示したグラフである。ここで、補助材AからDは以下の通りである。
補助材A :NaCO 5%重量 SiO 10%重量
補助材B :NaCO 7.5%重量 SiO 15%重量
補助材C :NaCO 10%重量 SiO 20%重量
補助材D :NaCO 15%重量 SiO 25%重量
FIG. 2 is a graph showing changes in slag viscosity with respect to temperature changes when soda ash Na 2 CO 3 and silica sand SiO 2 are added to asbestos as auxiliary materials. Here, the auxiliary materials A to D are as follows.
Auxiliary material A: Na 2 CO 3 5% weight SiO 2 10% weight Auxiliary material B: Na 2 CO 3 7.5% weight SiO 2 15% weight Auxiliary material C: Na 2 CO 3 10% weight SiO 2 20% weight Auxiliary material D: Na 2 CO 3 15% weight SiO 2 25% weight

図2より、溶融温度が1200℃〜1500℃の範囲において、アスベストに補助材を添加しない場合では、100000〜0.05Poiseとスラグの粘度が大きく変動している。特に1200℃のときには水飴(10000〜1000Poise程度)よりはるかに粘度が高くなり、スラグの排出時にスラグの冷却に伴ってスラグが固着してノズル等が閉塞することが予想される。   From FIG. 2, when the auxiliary material is not added to asbestos in the range of the melting temperature of 1200 ° C. to 1500 ° C., the viscosity of 100000 to 0.05 Poise and the slag greatly fluctuate. In particular, when the temperature is 1200 ° C., the viscosity is much higher than that of the water tank (about 1000 to 1000 Poise), and it is expected that the slag adheres and the nozzles are blocked when the slag is discharged as the slag is cooled.

しかし、副材料を適量添加することにより、溶融温度の範囲内で粘度の変化を10〜0.05Poise程度に抑えることができる。特に、1200℃にスラグが低下したときでも10Poiseまでしか粘度があがらず、良好な流動性を保持することができる。なお、副材料を添加すると、カレット(ソーダガラス:1000〜100Poise)より遥かに高い流動性を確保できることが分かる。   However, by adding an appropriate amount of the auxiliary material, the change in viscosity can be suppressed to about 10 to 0.05 Poise within the range of the melting temperature. In particular, even when the slag is lowered to 1200 ° C., the viscosity increases only to 10 Poise, and good fluidity can be maintained. In addition, when a secondary material is added, it turns out that fluidity far higher than cullet (soda glass: 1000-100 Poise) can be ensured.

このように、溶融温度が1200℃〜1500℃の範囲内で良好な流動性を確保し、かつ発生するスラグを少量に抑えるために、本実施例の廃石綿投入装置を使用した廃石綿投入方法では、炭酸ナトリウムを廃石綿の5%重量から15%重量、二酸化ケイ素を廃石綿の10%重量から30%重量の範囲内で添加することが好ましい。   Thus, in order to ensure good fluidity within a melting temperature range of 1200 ° C. to 1500 ° C. and suppress the generated slag to a small amount, a waste asbestos input method using the waste asbestos input device of this embodiment is used. Then, it is preferable to add sodium carbonate within a range of 5% to 15% by weight of waste asbestos and silicon dioxide within a range of 10% to 30% by weight of waste asbestos.

以上詳細に説明したとおり、アスベストを含む廃棄物を1500℃程度の高温により溶融無害化する処理設備において、本実施例の廃石綿投入装置および投入方法によれば、石綿の飛散を防ぐため袋詰めで搬入される廃棄物を石綿が飛散しないようにして連続的に溶融炉に投入し、速やかに溶融させるとともに、スラグの流動性を確保して速やかにスラグを排出させ、効率的に廃石綿を溶融処理することができる。さらに、溶融炉の雰囲気にアスベストの結晶が放出されることを防ぎ、排ガスの処理設備を簡素化することができる。   As described above in detail, in the processing facility for melting and detoxifying waste containing asbestos at a high temperature of about 1500 ° C., according to the waste asbestos input device and the input method of this embodiment, the asbestos is packed in order to prevent the asbestos from scattering. In order to prevent the asbestos from splashing, it is continuously put into the melting furnace and melted quickly, while ensuring the fluidity of the slag and quickly discharging the slag to efficiently remove the waste asbestos. It can be melted. Furthermore, it is possible to prevent the asbestos crystals from being released into the melting furnace atmosphere and to simplify the exhaust gas treatment facility.

本発明の1実施例における溶融炉への廃石綿投入装置の概略図である。It is the schematic of the waste asbestos injection | throwing-in apparatus to the melting furnace in one Example of this invention. 副材料を添加した際の温度変化に対するスラグ粘度の変化を示したグラフである。It is the graph which showed the change of the slag viscosity with respect to the temperature change at the time of adding a submaterial.

符号の説明Explanation of symbols

1 供給装置
2、10 シールゲート
3 投入口
4 搬入コンベヤ
5 副材料供給装置
6 水スプレー
7 スクリュフィーダ
8 配送管
9 ロータリーバルブ
11 溶融炉
12 廃石綿
DESCRIPTION OF SYMBOLS 1 Supply apparatus 2, 10 Seal gate 3 Inlet 4 Carry-in conveyor 5 Submaterial supply apparatus 6 Water spray 7 Screw feeder 8 Delivery pipe 9 Rotary valve 11 Melting furnace 12 Waste asbestos

Claims (10)

廃棄物を溶流処理する溶融炉に耐水性の袋に詰められ廃石綿を含む廃棄物を投入する装置であって、耐水性の袋に詰められた該廃棄物を2重シールゲートを介して受け入れる受入口、該耐水性の袋を破砕する破砕装置、該廃棄物を圧縮する圧縮装置および該廃棄物を連続的に前記溶融炉に排出する繰り出し装置を備えることを特徴とする溶融炉への廃石綿投入装置。 An apparatus for charging a waste furnace containing waste asbestos into a melting furnace that performs waste flow treatment of waste, and containing the waste asbestos through the double seal gate An inlet for receiving, a crushing device for crushing the water-resistant bag, a compression device for compressing the waste, and a feeding device for continuously discharging the waste to the melting furnace are provided. Waste asbestos input device. 進行方向に狭窄するテーパを設けられた1台のスクリュフィーダが備わり、前記圧縮装置および繰り出し装置の機能を該スクリュフィーダが兼ね備えていて、該スクリュフィーダのスクリュに前記破砕装置が備わっていることを特徴とする請求項1記載の溶融炉への廃石綿投入装置。 One screw feeder provided with a taper that narrows in the traveling direction is provided, the screw feeder has the functions of the compression device and the feeding device, and the crushing device is provided in the screw of the screw feeder. The apparatus for charging waste asbestos into a melting furnace according to claim 1, characterized in that: さらに、副材料を添加する副材料投入装置、該副材料と前記廃棄物を混合する混練装置を備えることを特徴とする請求項1または2に記載の溶融炉への廃石綿投入装置。 The apparatus for charging waste asbestos into a melting furnace according to claim 1 or 2, further comprising: an auxiliary material charging device for adding the secondary material; and a kneading device for mixing the secondary material and the waste. 前記混練装置が進行方向に狭窄するテーパを設けられたスクリュフィーダであって、該スクリュフィーダが前記圧縮装置および前記繰り出し装置の機能を併せ持ち、該スクリュフィーダのスクリュに前記破砕装置が備わっていることを特徴とする請求項3記載の溶融炉への廃石綿投入装置。 The kneading device is a screw feeder provided with a taper narrowing in the advancing direction, the screw feeder has the functions of the compression device and the feeding device, and the screw of the screw feeder is equipped with the crushing device. The waste asbestos injection apparatus to the melting furnace of Claim 3 characterized by these. 前記溶融炉は負圧下で操業されるプラズマ溶融炉であることを特徴とする請求項1から4のいずれかに記載の溶融炉への廃石綿投入装置。 The apparatus for charging waste asbestos into a melting furnace according to any one of claims 1 to 4, wherein the melting furnace is a plasma melting furnace operated under a negative pressure. 溶融炉に耐水性の袋に詰められ廃石綿を含む廃棄物を投入する投入方法であって、該耐水性の袋に詰められた廃棄物を2重シールゲートを介して受け入れる受入手段、該耐水性の袋を破砕する破砕手段、副材料を供給する副材料供給手段、該廃棄物と該副材料を混合する混練手段、該廃棄物を圧縮する圧縮手段および該廃棄物を連続的に前記溶融炉に排出する排出手段からなることを特徴とする溶融炉への廃石綿投入方法。 A charging method for charging waste containing asbestos that is packed in a water-resistant bag into a melting furnace, the receiving means for receiving the waste packed in the water-resistant bag through a double seal gate, the water-resistant A crushing means for crushing the plastic bag, a secondary material supply means for supplying the secondary material, a kneading means for mixing the waste and the secondary material, a compression means for compressing the waste, and the melting of the waste continuously. A method for charging waste asbestos into a melting furnace, characterized by comprising discharging means for discharging into the furnace. 前記副材料として、炭酸ナトリウムNaCO(ソーダ灰)を添加することを特徴とする請求項6に記載の溶融炉への廃石綿投入方法。 Examples submaterial, waste asbestos-on method to melting furnace according to claim 6, characterized in that the addition of sodium carbonate Na 2 CO 3 (soda ash). 前記炭酸ナトリウムの添加量が前記廃棄物の5%重量から15%重量の範囲であることを特徴とする請求項7記載の廃石綿の処理方法。 The method for treating waste asbestos according to claim 7, wherein the amount of sodium carbonate added ranges from 5% to 15% by weight of the waste. 前記副材料として、酸化珪素SiOを添加することを特徴とする請求項6から8に記載の溶融炉への廃石綿投入方法。 The method for charging waste asbestos into the melting furnace according to claim 6, wherein silicon oxide SiO 2 is added as the auxiliary material. 前記酸化珪素の添加量が前記廃棄物の10%重量から30%重量の範囲であることを特徴とする請求項9記載の溶融炉への廃石綿投入方法。 The method for charging waste asbestos into a melting furnace according to claim 9, wherein the amount of silicon oxide added ranges from 10% to 30% by weight of the waste.
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