JP2005066417A - Melting pretreatment apparatus and melting apparatus - Google Patents

Melting pretreatment apparatus and melting apparatus Download PDF

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JP2005066417A
JP2005066417A JP2003296905A JP2003296905A JP2005066417A JP 2005066417 A JP2005066417 A JP 2005066417A JP 2003296905 A JP2003296905 A JP 2003296905A JP 2003296905 A JP2003296905 A JP 2003296905A JP 2005066417 A JP2005066417 A JP 2005066417A
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melting
pretreatment
drying
fluidized bed
melted
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Junji Nakayama
純司 中山
Ryuichi Ishikawa
龍一 石川
Junichi Shiratori
潤一 白鳥
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Ebara Corp
株式会社荏原製作所
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melting pretreatment apparatus with which a melting pretreatment process can be simplified, a sorted material has no adhesion of fine ash and fine particles, a special processing device of waste plastics is unnecessary when waste plastics are utilized as a heating source of a melting device, and to provide a melting apparatus using the melting pretreatment apparatus. <P>SOLUTION: In the melting pretreatment apparatus, the inside of the apparatus is executed with refractories, a fluidized-bed section filled up with sand 24 of 0.3mm to 0.8mm particle size as a fluid medium is provided, air 29 is blown in from a lower part of the fluidized-bed section 13-6, fuel is burned on fluid sand 24 to maintain temperature of the fluid sand 24 at 200°C to 600°C or at 400°C to 600°C, a material to be melted is charged and further a discharging mechanism which can periodically or continuously discharge coarse grains of incombustible 25 and metals such as iron 26 and aluminum 27 together with the sand 24 from a lower part of the fluidized-bed section, is installed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、廃棄物焼却灰等の各種灰、焼却飛灰、下水汚泥、し尿汚泥、若しくは最終処分地からの掘り起こし残渣、又はこれらの混合物からなる溶融対象物を溶融炉で溶融する前に乾燥処理する溶融前処理装置及び該溶融前処理装置を使用する溶融装置に関するものである。   The present invention provides various ashes such as waste incineration ash, incineration fly ash, sewage sludge, human waste sludge, digging residue from the final disposal site, or a melting target consisting of a mixture thereof before drying in a melting furnace. The present invention relates to a melting pretreatment apparatus to be processed and a melting apparatus using the melting pretreatment apparatus.
廃棄物焼却後の焼却灰を溶融する場合、その前処理として大塊物を篩で分別した後、篩下の焼却灰を溶融に適した大きさにするために破砕機で破砕しており、焼却灰中の金属類は磁選機を用いて鉄類を分別及びアルミ選別機を用いてアルミ等の非鉄金属を分別している。そして、分別された鉄類やアルミ類は再利用に供されている。   When melting incineration ash after waste incineration, as a pretreatment, large chunks are separated with a sieve, and then the incineration ash under the sieve is crushed with a crusher to make it suitable for melting, Metals in the incinerated ash are separated using a magnetic separator to separate irons and using an aluminum sorter to separate non-ferrous metals such as aluminum. The separated irons and aluminums are reused.
また、焼却が水分を多く含む場合は、乾燥装置を設けて溶融に適した含水率まで乾燥させている。乾燥装置には気流乾燥装置、回転式乾燥装置、流動層乾燥装置等があるが、いずれも乾燥機外で発生させた熱風を乾燥用流体に使用している。廃棄物焼却後の焼却灰は溶融される前に、飛散しないように固形化される場合もある。   Further, when the incineration contains a lot of moisture, a drying device is provided to dry the moisture content suitable for melting. Examples of the drying device include an air flow drying device, a rotary drying device, a fluidized bed drying device, and the like, and all use hot air generated outside the dryer as a drying fluid. Incineration ash after waste incineration may be solidified so as not to be scattered before being melted.
図1は従来の一般的な焼却灰の溶融前処理フローを示す図である。図示するように、焼却灰貯留ピット101に貯留されている焼却灰を受入灰スクリーン102にかけ、溶融不適物103を除去した後、乾燥機104で乾燥させる。乾燥させた焼却灰は振動篩105で大塊物を分別し、該大塊物は破砕機106にかけて破砕した後、再び振動篩105にかけ大塊物を分別する。振動篩105で選別された溶融に適する大きさの焼却灰は磁選機107でその中に含まれる鉄類108が分別され、更にアルミ選別機109でアルミ類110等の非鉄金属が分別される。アルミ選別機109を通った焼却灰は粒度選別機111で資源化物112を除去した後、供給ホッパ113から、灰溶融炉114に投入され、溶融されスラグ115となる。   FIG. 1 is a diagram showing a conventional pre-melting treatment flow of general incineration ash. As shown in the drawing, the incineration ash stored in the incineration ash storage pit 101 is applied to the receiving ash screen 102 to remove the unsuitable melting material 103 and then dried by the dryer 104. The incinerated ash that has been dried is separated into large lumps with a vibrating sieve 105, and the large lumps are crushed by a crusher 106, and then again crushed through a vibrating sieve 105 to separate large lumps. The incinerated ash of a size suitable for melting selected by the vibrating sieve 105 is used to separate the irons 108 contained therein by the magnetic separator 107, and further the non-ferrous metal such as the aluminum 110 is separated by the aluminum sorter 109. The incinerated ash that has passed through the aluminum sorter 109 is removed from the resource 112 by the particle size sorter 111 and then fed from the supply hopper 113 into the ash melting furnace 114 and melted to become slag 115.
近年、焼却灰に含まれる重金属類、ダイオキシン類等の有害物は細粒物に多く存在し、粗粒物には殆ど含まれないため、前処理で分別した細粒物だけを溶融し、粗粒物はさらに篩いを用いて各サイズに選別し、有効利用することが非特許文献1及び2等で提案されている。   In recent years, harmful metals such as heavy metals and dioxins contained in incineration ash are often present in fine-grained products and are hardly contained in coarse-grained materials. Therefore, only fine-grained materials separated by pretreatment are melted, Non-patent documents 1 and 2 propose that the granules are further classified into various sizes using a sieve and effectively used.
また、非特許文献3に示すように、灯油や都市ガスを使用する燃焼式溶融の場合は、廃プラスチック類を溶融資源として利用し、廃プラスチックの処理と共に、灯油や都市ガスの燃料低減に役立てることができることも提案されている。
ごみ焼却灰構成粒子の基礎特性:第22回全国都市清掃研究発表会講演論文集(2001 2)P.183〜P.185 分級処理焼却灰の資源化技術と用途開発:第22回全国都市清掃研究発表会講演論文集(2001 2)P.186〜P.188 エコバーナー式廃溶融炉の開発:第22回全国都市清掃研究発表会講演論文集(2001 2)P.154〜P.156 一般廃棄物プラスチック循環型処理システムについて:第19回全国都市清掃研究発表会講演論文集(1998 2)P.109〜P.111 特開平7−332614号公報
In addition, as shown in Non-Patent Document 3, in the case of combustion-type melting using kerosene or city gas, waste plastics are used as a melting resource, and are used for waste plastic processing and for reducing fuel for kerosene and city gas. It has also been proposed that it can.
Basic characteristics of waste incinerated ash constituent particles: Proceedings of the 22nd National Urban Cleaning Research Presentation (2001 2) 183-P. 185 Recycling technology and application development of classified incineration ash: Proceedings of the 22nd National Urban Cleaning Research Presentation (2001 2) 186-P. 188 Development of eco-burner-type waste melting furnace: Proceedings of the 22nd National Urban Cleaning Research Presentation (2001 2) 154-P. 156 General waste plastic recycling treatment system: Proceedings of the 19th National Urban Cleaning Research Presentation (1998 2) 109-P. 111 JP-A-7-332614
上記のように焼却灰を溶融するための前処理工程は、各種篩、乾燥機、破砕機、磁選機、アルミ選別機等の設置が必要とされ、各構成機器へ焼却灰を搬送するための多数のコンベア類も設置されており煩雑で、各機器を設置するためのスペースも広く必要となっている。また、分別された鉄類やアルミ類はその表面に微細な焼却灰が付着しているためそのまま利用するには難しく、例えば水洗等により洗浄する必要があり、前処理工程が更に煩雑となる。   As described above, the pretreatment process for melting the incinerated ash requires the installation of various sieves, dryers, crushers, magnetic separators, aluminum sorters, etc., for transporting the incinerated ash to each component device. Numerous conveyors are also installed, which is cumbersome and requires a wide space for installing each device. Further, the separated irons and aluminums are difficult to use as they are because fine incineration ash adheres to the surface thereof, and it is necessary to wash them with water, for example, and the pretreatment process becomes more complicated.
また、前処理工程で分別された、有害物質を殆ど含まない粗粒物をさらに選別して有効利用する場合も、鉄類やアルミ類と同じように細粒灰が付着しており、これを除去することは難しい。   In addition, fine ash adheres in the same way as irons and aluminums when the coarse particles that are separated in the pretreatment process and contain almost no harmful substances are selected and used effectively. It is difficult to remove.
また、廃プラスチック類を乾燥熱源に利用する場合は、廃プラスチック類から金属等の異物を取り除くための選別装置が必要であり、破砕して微粒化するための破砕機や場合によっては固形化をさせるための固形化装置が必要になることもあり、乾燥に利用する前に廃棄プラスチック類の加工設備が必要となっている(非特許文献4参照)。   In addition, when waste plastics are used as a heat source for drying, a sorting device is required to remove foreign substances such as metals from the waste plastics, and a crusher for crushing and atomizing is used. In some cases, a solidification device is required, and processing equipment for waste plastics is required before use for drying (see Non-Patent Document 4).
本発明は、上述の点に鑑みてなされたもので、溶融の前処理工程を簡略にすることができると共に、分別物に微細な灰や細粒物の付着を有することなく、廃プラスチック類を溶融設備での熱源に利用する場合にも特別な廃プラスチック類の加工設備を必要としない溶融前処理装置及び該溶融前処理装置を用いた溶融装置を提供することを目的とする。   The present invention has been made in view of the above-mentioned points, and can simplify the pretreatment step of melting, and can eliminate waste plastics without adhesion of fine ash and fine particles to the fraction. It is an object of the present invention to provide a melting pretreatment apparatus that does not require special processing equipment for waste plastics even when it is used as a heat source in a melting facility, and a melting apparatus using the melting pretreatment apparatus.
上記課題を解決するため請求項1に記載の発明は、流動床式燃焼乾燥装置を具備し、溶融対象物を溶融炉に投入して溶融処理する前に該溶融対象物を、該流動床式燃焼乾燥装置に投入して乾燥させる溶融対象物の溶融前処理装置であって、流動床式燃焼乾燥装置は、装置内部が耐火物で施工され、流動媒体として粒径0.3mm〜0.8mmの砂が充填されている流動床部を具備し、該流動床部の下部から該砂を流動するための流動空気を吹き込み、必要に応じて流動している砂の上又は砂中で燃料を燃焼させ、該流動する砂の温度を200℃〜600℃若しくは400℃〜600℃に維持させると共に、該流動床部上に溶融対象物を投入し、流動乾燥排ガスと同伴する該溶融対象物を溶融炉に導入するようにし、該流動床部下部から溶融対象物中の流動乾燥排ガスに同伴されていない粗粒の不燃物及び金属を砂と伴に定期的若しくは連続的に排出する事ができる排出機構を備えたことを特徴とする。   In order to solve the above-mentioned problem, the invention described in claim 1 is provided with a fluidized bed combustion drying apparatus, and the molten object is put into the fluidized bed type before the molten object is put into a melting furnace and melted. A melting pretreatment apparatus for melting an object to be introduced into a combustion drying apparatus and dried, wherein the fluidized bed combustion drying apparatus is constructed with a refractory inside and has a particle size of 0.3 mm to 0.8 mm as a fluid medium. A fluidized bed portion filled with a sand, and injecting fluid air for flowing the sand from the lower portion of the fluidized bed portion, and if necessary, fuel on or in the flowing sand. Combusting and maintaining the temperature of the flowing sand at 200 ° C. to 600 ° C. or 400 ° C. to 600 ° C., charging the molten object onto the fluidized bed, and It is introduced into the melting furnace, and the melting Characterized by comprising a discharge mechanism grit incombustible not entrained in the fluidized drying exhaust gas in the goods and metal can be periodically or continuously exhausted sand and companion.
請求項2に記載の発明は、請求項1に記載の溶融前処理装置において、溶融対象物中の細粒物を風力選別により分級し、溶融炉に導くと共に、細粒溶融対象物の付着を伴わない粗粒物及び金属類を得ることを特徴とする。   According to a second aspect of the present invention, in the pre-melting apparatus according to the first aspect, the fine particles in the object to be melted are classified by wind sorting and guided to the melting furnace, and the fine particles to be melted are adhered. It is characterized by obtaining coarse particles and metals which are not accompanied.
請求項3に記載の発明は、請求項1又は2に記載の溶融前処理装置において、溶融対象物が、焼却灰、焼却飛灰、下水汚泥、し尿汚泥、若しくは最終処分地からの掘り起こし残渣、又はこれらの混合物であることを特徴とする。   The invention according to claim 3 is the pretreatment apparatus for melting according to claim 1 or 2, wherein the object to be melted is incineration ash, incineration fly ash, sewage sludge, human waste sludge, or digging residue from the final disposal site, Or a mixture thereof.
請求項4に記載の発明は、請求項1又は2又は3に記載の溶融前処理装置において、流動床式燃焼乾燥装置で使用する燃料は、A重油、灯油等の液体燃料、又は都市ガス、LPG等の気体燃料、又は石炭、コークス、RDF等の固形燃料であることを特徴とする。   The invention described in claim 4 is the pre-melting apparatus according to claim 1, 2 or 3, wherein the fuel used in the fluidized bed combustion drying apparatus is liquid fuel such as heavy fuel oil A or kerosene, city gas, It is characterized by being a gaseous fuel such as LPG or a solid fuel such as coal, coke or RDF.
請求項5に記載の発明は、請求項1乃至4に記載の溶融前処理装置において、流動床式燃焼乾燥装置で使用する燃料の一部若しくは燃料の代りに廃プラスチック類、紙類、厨芥類、繊維類、草木類、ゴム類、廃油類等の可燃物をそれぞれ単独若しくは混合して使用することを特徴とする。   A fifth aspect of the present invention is the pre-melting apparatus according to any one of the first to fourth aspects, wherein a part of the fuel used in the fluidized bed type combustion drying apparatus or a waste plastic, paper, and soot instead of the fuel. Combustible materials such as fibers, vegetation, rubbers, and waste oils are used alone or in combination.
請求項6に記載の発明は、溶融対象物を乾燥させる乾燥装置を有する前処理装置と該前処理装置で乾燥された溶融対象物を溶融する溶融炉を具備する溶融装置において、前処理装置の乾燥装置に請求項1乃至5のいずれか1項に記載の流動床式燃焼乾燥装置を用い、該流動床式燃焼乾燥装置から排出される乾燥された溶融対象物中の細粒物若しくは微細な溶融物を同伴した乾燥ガスを、直後後段の前記溶融炉に導入して当該細粒物若しくは微細な溶融対象物を溶融することを特徴とする。   According to a sixth aspect of the present invention, there is provided a melting apparatus comprising a pretreatment device having a drying device for drying a melting object and a melting furnace for melting the melting object dried by the pretreatment device. The fluidized bed combustion drying apparatus according to any one of claims 1 to 5 is used as a drying apparatus, and fine particles or fine particles in a dried molten object discharged from the fluidized bed combustion drying apparatus. The dry gas accompanied by the melt is introduced immediately afterwards into the subsequent melting furnace to melt the fine particles or the fine melt target.
請求項7に記載の発明は、溶融対象物を乾燥させる乾燥装置を有する前処理装置と該前処理装置で乾燥された溶融対象物を溶融する溶融炉を具備する溶融装置において、前処理装置の乾燥装置に請求項1乃至5のいずれか1項に記載の流動床式燃焼乾燥装置を用い、該流動床式燃焼乾燥装置から排出される乾燥された溶融対象物中の細粒物若しくは微細な溶融対象物を同伴した乾燥排ガスを、集塵装置に導入して、該集塵装置で集塵した細粒物若しくは微細な溶融対象物を溶融炉に導入することを特徴とする。   The invention according to claim 7 is a melting apparatus comprising a pretreatment device having a drying device for drying an object to be melted and a melting furnace for melting an object to be melted dried by the pretreatment device. The fluidized bed combustion drying apparatus according to any one of claims 1 to 5 is used as a drying apparatus, and fine particles or fine particles in a dried molten object discharged from the fluidized bed combustion drying apparatus. A dry exhaust gas accompanied by an object to be melted is introduced into a dust collector, and fine particles or fine objects to be melted collected by the dust collector are introduced into a melting furnace.
本発明によれば、焼却灰等の廃棄物焼却残渣や下水汚泥、し尿汚泥、若しくは最終処分地からの掘り起こし残渣等の溶融対象物を溶融処理する前の前処理として流動床式燃焼乾燥装置を使用することにより、溶融対象物中の重金属類、ダイオキシン類等の有害物質を多く含む細粒物と有害物質を殆ど含まない粗粒物とを風力選別すると共に、溶融対象物を200℃〜600℃若しくは400℃〜600℃の高温で乾燥するため溶融対象物中の粗粒物や鉄類、アルミ類等の金属類を衛生的に且つ、細粒物や微細な溶融対象物の付着がない状態で取り出すことができる。そのため、粗粒物や鉄類、アルミ類等の金属類を再利用する場合、有価価値のある資源化物として利用できる。   According to the present invention, the fluidized bed combustion drying apparatus is used as a pretreatment before melting the waste incineration residue such as incineration ash, sewage sludge, human waste sludge, or digging residue from the final disposal site and the like. By using it, wind-sorting fine particles containing a lot of harmful substances such as heavy metals and dioxins and coarse particles containing almost no harmful substances in the object to be melted, and the objects to be melted are 200 ° C. to 600 ° C. Because it is dried at a high temperature of ℃ or 400 ℃ to 600 ℃, metal such as coarse particles, irons and aluminum in the object to be melted is hygienic and there is no adhesion of fine particles and fine objects to be melted. Can be taken out in a state. Therefore, when reusing coarse particles, metals such as irons and aluminums, they can be used as valuable resources.
また、廃プラスチック類等の可燃性廃棄物を乾燥の燃料の一部若しくは燃料の代わりとして使用することができ、その場合も廃プラスチック類等の可燃性廃棄物を利用する前に破砕や異物を分別して固形化する加工設備を用意することもなく簡易に利用できる。   In addition, combustible waste such as waste plastics can be used as a part of dry fuel or as a substitute for fuel. In this case, crushing and foreign matter should be removed before using combustible waste such as waste plastics. It can be easily used without preparing processing equipment for separation and solidification.
以下、本発明の実施形態例を図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the drawings.
図2は、都市ごみ焼却施設から発生する焼却灰を燃焼式旋回溶融炉で溶融する本発明に係る灰溶融装置の処理フローを示す図である。図示するように、灰溶融装置は、焼却灰貯留ピット10、受入灰スクリーン11、灰供給ホッパ12、流動床式燃焼乾燥装置13、灰溶融炉(燃焼式旋回溶融炉)14、ボイラ15、減温塔16、集塵器17、湿式洗煙塔18、振動篩19、磁選機20、アルミ選別機21を具備する。   FIG. 2 is a diagram showing a processing flow of the ash melting apparatus according to the present invention for melting incineration ash generated from a municipal waste incineration facility in a combustion-type swirl melting furnace. As shown in the figure, the ash melting apparatus includes an incinerated ash storage pit 10, a receiving ash screen 11, an ash supply hopper 12, a fluidized bed combustion drying apparatus 13, an ash melting furnace (combustion type swirl melting furnace) 14, a boiler 15, and a reduction. A warm tower 16, a dust collector 17, a wet smoke cleaning tower 18, a vibrating sieve 19, a magnetic separator 20, and an aluminum separator 21 are provided.
都市ごみ焼却施設から排出される焼却灰は水分を20%〜40%含んでおり、未燃分は3%〜7%含有している。焼却灰貯留ピット10に貯留されている焼却灰は受入灰スクリーン11で200mm以上若しくは250mm以上の大塊物は溶融不適物22として分別した後、コンベヤ(図示せず)にて搬送され、流動床式燃焼乾燥装置13の灰供給ホッパ12に貯留される。その後、灰供給ホッパ12からスクリューコンベヤ(図4参照)で流動床式燃焼乾燥装置13に定量的に投入される。   Incineration ash discharged from municipal waste incineration facilities contains 20% to 40% of moisture, and 3% to 7% of unburned matter. The incinerated ash stored in the incinerated ash storage pit 10 is separated by the receiving ash screen 11 as a large mass having a size of 200 mm or more or 250 mm or more as an unsuitable molten material 22, and then conveyed by a conveyor (not shown) to be a fluidized bed. Is stored in the ash supply hopper 12 of the combustion type combustion dryer 13. Thereafter, the ash supply hopper 12 is quantitatively charged into the fluidized bed combustion dryer 13 by a screw conveyor (see FIG. 4).
図4は流動床式燃焼乾燥装置13の構成例を示す図である。流動床式燃焼乾燥装置13は図示するように、都市ガスを燃焼させるためのバーナ13−1が設置されており、装置内部は耐火物で施工されている。内部には流動媒体として粒径0.3mm〜0.8mmの砂24が充填された流動床部13−6が設けられており、流動床部13−6の下部から、散気板13−2を通して流動用空気29が吹きこまれる構造となっている。流動床式燃焼乾燥装置13内は、流動している砂24上で都市ガス28(図2参照)を燃焼させることにより、400℃〜600℃の高温の砂が流動している状態となっている。   FIG. 4 is a diagram illustrating a configuration example of the fluidized bed combustion drying apparatus 13. As shown in the figure, the fluidized bed combustion drying apparatus 13 is provided with a burner 13-1 for burning city gas, and the inside of the apparatus is constructed with a refractory. Inside, a fluidized bed portion 13-6 filled with sand 24 having a particle size of 0.3 mm to 0.8 mm is provided as a fluidized medium. From the lower portion of the fluidized bed portion 13-6, the diffuser plate 13-2 is provided. The flow air 29 is blown through. In the fluidized bed combustion drying apparatus 13, the city gas 28 (see FIG. 2) is burned on the flowing sand 24 so that high-temperature sand at 400 ° C. to 600 ° C. is flowing. Yes.
灰供給ホッパ12から流動床式燃焼乾燥装置13内に定量的に投入された焼却灰は400℃〜600℃の高温で流動している砂24により、同伴している水分が瞬時に蒸発し乾燥され、未燃物は短時間で焼却処理される。家庭から分別収集された廃プラスチック類は日本容器包装リサイクル協会の定める異物混入率10%以下まで選別することなく、そのまま中継基地でポリエチレンシートにより圧縮梱包され、本灰溶融装置の施設内に搬入される。ヤードに貯留されている圧縮梱包された廃プラスチック類は搬送コンベアで廃プラスチック解砕機に送られ、解砕された後、焼却灰とは別の供給口から流動床式燃焼乾燥装置13内に投入される。流動床式燃焼乾燥装置13内に投入された廃プラスチック類30(図2参照)は装置内で短時間で燃焼され、燃焼熱は焼却灰を乾燥し、流動する砂24の温度の維持及び乾燥排ガス昇温に利用され、都市ガス28の使用量を低減させることができる。   The incinerated ash quantitatively charged from the ash supply hopper 12 into the fluidized bed combustion dryer 13 is dried by instantly evaporating the accompanying water by the sand 24 flowing at a high temperature of 400 ° C. to 600 ° C. The unburned material is incinerated in a short time. Waste plastics collected separately from households are compressed and packed with polyethylene sheets at a relay station without being sorted to a foreign matter contamination rate of 10% or less as determined by the Japan Containers and Packaging Recycling Association, and then carried into the ash melting facility. The Compressed and packed waste plastics stored in the yard are sent to a waste plastic crusher by a conveyor, and after being crushed, they are put into the fluidized bed combustion dryer 13 from a supply port different from the incineration ash. Is done. Waste plastics 30 (see FIG. 2) charged into the fluidized bed combustion drying apparatus 13 are combusted in the apparatus in a short time, and the combustion heat dries the incineration ash, maintaining the temperature of the flowing sand 24 and drying. It is used for exhaust gas temperature rise, and the usage-amount of the city gas 28 can be reduced.
流動床式燃焼乾燥装置13下部には流動乾燥ガスに同伴されない焼却灰中の粗粒の不燃物25、鉄類26、アルミ類27等の金属を砂24と共に排出する不燃物排出管13−3及び該不燃物排出管13−3に接続してスクリュー式排出装置13−4が設けられている。また、該スクリュー式排出装置13−4の排出口には振動篩19が配置されている。水で冷却されたスクリュー式排出装置13−4により、不燃物排出管13−3を通して流動床式燃焼乾燥装置13内から定期的に若しくは連続的に抜出された不燃物(焼却灰中の粗粒物)25、鉄類26、アルミ類27等の金属、砂24の混合物は、振動篩19に供給される。振動篩19はその目開き3mm〜8mmで、該振動篩19により砂24が分離され、該砂24は流動媒体循環装置13−5により流動床式燃焼乾燥装置13内に戻される。焼却灰のうち粒径が3mm〜8mm以下の粗粒物は、砂24と共に流動床式燃焼乾燥装置13内に戻されるが、装置内での砂24の流動による摺動摩耗により微粉となり、灰溶融炉14に供給される。   In the lower part of the fluidized bed combustion drying device 13, a noncombustible material discharge pipe 13-3 for discharging the coarse particles of the incombustible ash 25, irons 26, aluminums 27, etc. in the incinerated ash not accompanied by the fluidized drying gas together with the sand 24 And the screw type discharge device 13-4 is provided in connection with the incombustible discharge pipe 13-3. Moreover, the vibration sieve 19 is arrange | positioned at the discharge port of this screw type discharge device 13-4. Non-combustible material (crude in incinerated ash) periodically or continuously withdrawn from the fluidized bed combustion drying device 13 through the non-combustible material discharge pipe 13-3 by the screw-type discharge device 13-4 cooled with water. The mixture of particles (granules) 25, irons 26, aluminums 27, etc. and sand 24 is supplied to the vibrating sieve 19. The vibrating sieve 19 has an opening of 3 mm to 8 mm, and the sand 24 is separated by the vibrating sieve 19, and the sand 24 is returned to the fluidized bed combustion drying apparatus 13 by the fluidized medium circulating device 13-5. Coarse particles having a particle size of 3 mm to 8 mm or less among the incinerated ash are returned to the fluidized bed combustion drying apparatus 13 together with the sand 24, but become fine powder due to sliding wear due to the flow of the sand 24 in the apparatus, and the ash It is supplied to the melting furnace 14.
また、粒径が3mm〜8mm以上の不燃物25、鉄類26及びアルミ類27は、先ず磁選機20で鉄類26が分別除去され、続いてアルミ選別機21でアルミ類27と資源化物としての不燃物25に分別される。流動床式燃焼乾燥装置13から抜出された不燃物25、鉄類26、アルミ類27等の金属類は400℃〜600℃の温度で熱処理されているため衛生的で、流動する砂24により表面を擦られて、風力選別を受けているため細粒物若しくは微細な灰の付着もない。従って、磁選機20で選別された鉄類26、アルミ選別機21で選別されたアルミ類27と不燃物25は有価価値が高い資源化物として回収される。   Further, the incombustible material 25, the irons 26, and the aluminums 27 having a particle diameter of 3 mm to 8 mm or more are first separated and removed by the magnetic separator 20, and then the aluminum separators 21 and the resources 27 are recycled by the aluminum separator 21. The incombustible material 25 is separated. Metals such as incombustibles 25, irons 26, and aluminum 27 extracted from the fluidized bed combustion dryer 13 are heat treated at a temperature of 400 ° C. to 600 ° C. Since the surface is rubbed and subjected to wind sorting, there is no adhesion of fine particles or fine ash. Therefore, the irons 26 selected by the magnetic separator 20, the aluminum 27 and the non-combustible material 25 selected by the aluminum separator 21 are collected as resources having a high value.
乾燥した焼却灰のうち細粒物若しくは微細な灰は流動用空気29により風力選別され、流動乾燥後の排ガスと共に流動床式燃焼乾燥装置13から排出された後、そのまま後段の灰溶融炉14に導入され、溶融される。灰溶融炉14は上記のように燃焼式旋回溶融炉で、都市ガスにより1200℃〜1500℃が維持され排ガス中の細粒物若しくは微細な灰は溶融されスラグ23となって灰溶融炉14の外に排出される。灰溶融炉14から排出される排ガスはボイラ15で熱回収され、減温塔16を通って減温され、集塵器17を通って、飛灰等の灰塵が捕集され、更に湿式洗煙塔18を通って洗煙され、図示しない煙突を通って大気中に放出される。   Of the dried incinerated ash, fine particles or fine ash is subjected to wind sorting by the fluid air 29 and discharged from the fluidized bed combustion drying device 13 together with the exhaust gas after fluid drying, and then directly into the subsequent ash melting furnace 14. Introduced and melted. As described above, the ash melting furnace 14 is a combustion-type swirl melting furnace, which is maintained at 1200 ° C. to 1500 ° C. by city gas, and fine particles or fine ash in the exhaust gas is melted to form slag 23 to form the ash melting furnace 14. Discharged outside. Exhaust gas discharged from the ash melting furnace 14 is recovered by a boiler 15 and reduced in temperature through a temperature reducing tower 16, ash dust such as fly ash is collected through a dust collector 17, and further wet smoke washing. The smoke is washed through the tower 18 and discharged into the atmosphere through a chimney (not shown).
図3は本発明に係る灰溶融装置の他の処理フローを示す図である。本灰溶融装置が図2の灰溶融装置と異なる点は、本灰溶融装置では流動床式燃焼乾燥装置13から排出された細粒な灰を含む排ガスを空気予熱器31に導入し、流動用空気29(図4参照)を加熱するために乾燥廃熱を回収した後、集塵器32で当該細粒物若しくは微細な灰を捕集し、集塵灰貯留槽33に貯留した後、灰溶融炉14に投入し溶融してスラグ23として灰溶融炉14の外に排出するようにしたものである。ここで集塵器32には、ろ過式集塵器、電気集塵器、サイクロン等を使用することができる。   FIG. 3 is a diagram showing another processing flow of the ash melting apparatus according to the present invention. The present ash melting apparatus is different from the ash melting apparatus of FIG. 2 in that the exhaust gas containing fine ash discharged from the fluidized bed combustion drying apparatus 13 is introduced into the air preheater 31 and is used for flow. After collecting the waste waste heat to heat the air 29 (see FIG. 4), the fine particles or fine ash is collected by the dust collector 32 and stored in the dust collection ash storage tank 33, and then the ash The slag 23 is charged into the melting furnace 14 and melted to be discharged out of the ash melting furnace 14. Here, as the dust collector 32, a filtration dust collector, an electric dust collector, a cyclone, or the like can be used.
図3に示す構成の灰溶融装置では、灰溶融炉14で溶融した細粒物若しくは微細な灰のみを1200℃〜1500℃の高温とするために、流動床式燃焼乾燥装置13から排出される乾燥ガスと細粒物若しくは微細な灰とを集塵器で分離し、多量の排ガスを1200℃〜1500℃の高温とすることを避け、使用される都市ガスの量を低減することが可能となる。集塵灰貯留槽33に貯留された細粒物若しくは微細な灰は少量の空気により燃焼式旋回溶融炉である灰溶融炉14に空気輸送され、効率的に溶融されスラグ23となり、灰溶融炉14の外に排出される。   In the ash melting apparatus having the configuration shown in FIG. 3, only the fine particles or fine ash melted in the ash melting furnace 14 is discharged from the fluidized bed combustion drying apparatus 13 in order to increase the temperature to 1200 ° C. to 1500 ° C. It is possible to reduce the amount of city gas used by separating dry gas and fine particles or fine ash with a dust collector, avoiding a large amount of exhaust gas to a high temperature of 1200 ° C to 1500 ° C. Become. Fine particles or fine ash stored in the dust collection ash storage tank 33 is air-transported by a small amount of air to the ash melting furnace 14 which is a combustion-type swirl melting furnace, and is efficiently melted to become the slag 23. 14 is discharged outside.
以上本発明の実施形態を説明したが、本発明は上記実施形態に限定されるものではなく、特許請求の範囲、及び明細書と図面に記載された技術的思想の範囲内において種々の変形が可能である。例えば、溶融対象としての灰は、都市ごみ等の焼却灰に限定されるものではなく、焼却飛灰、下水汚泥、し尿汚泥、若しくは最終処分地からの掘り起こし残渣、又はこれらの混合物でもよい。また、流動床式燃焼乾燥装置13で使用する燃料としては都市ガスやLPG等の気体燃料に限定されるものではなく、A重油、灯油等の液体燃料、石炭、コークス、RDF等の固形燃料を使用することもできる。また、燃料の一部若しくは燃料の代わりに廃プラスチック類、紙類、厨芥類、繊維類、草木類、ゴム類、廃油類等の可燃物をそれぞれ単独若しくは混合して使用することできる。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, the ash to be melted is not limited to incineration ash such as municipal waste, but may be incineration fly ash, sewage sludge, human waste sludge, digging residue from the final disposal site, or a mixture thereof. Further, the fuel used in the fluidized bed combustion dryer 13 is not limited to gas fuel such as city gas and LPG, but liquid fuel such as A heavy oil and kerosene, solid fuel such as coal, coke, and RDF. It can also be used. In addition, combustible materials such as waste plastics, papers, cocoons, fibers, vegetation, rubbers, waste oils, etc., can be used alone or in combination with a part of the fuel or in place of the fuel.
従来の一般的な焼却灰の溶融前処理フローを示す図である。It is a figure which shows the melting pre-processing flow of the conventional general incineration ash. 本発明に係る灰溶融装置の処理フローを示す図である。(実施例1)It is a figure which shows the processing flow of the ash melting apparatus which concerns on this invention. (Example 1) 本発明に係る灰溶融装置の処理フローを示す図である。(実施例2)It is a figure which shows the processing flow of the ash melting apparatus which concerns on this invention. (Example 2) 本発明に係る灰溶融装置に使用する流動床式燃焼乾燥装置の構成例を示す図である。It is a figure which shows the structural example of the fluidized bed type combustion drying apparatus used for the ash melting apparatus which concerns on this invention.
符号の説明Explanation of symbols
10 焼却灰貯留ピット
11 受入灰スクリーン
12 灰供給ホッパ
13 流動床式燃焼乾燥装置
14 灰溶融炉
15 ボイラ
16 減温塔
17 集塵器
18 湿式洗煙塔
19 振動篩
20 磁選機
21 アルミ選別機
22 溶融不適物
23 スラグ
24 砂
25 不燃物
26 鉄類
27 アルミ類
28 都市ガス
29 流動用空気
30 廃プラスチック類
31 空気予熱器
32 集塵器
33 集塵灰貯留槽
DESCRIPTION OF SYMBOLS 10 Incinerated ash storage pit 11 Receiving ash screen 12 Ash supply hopper 13 Fluidized bed type combustion dryer 14 Ash melting furnace 15 Boiler 16 Temperature reducing tower 17 Dust collector 18 Wet smoke tower 19 Vibrating sieve 20 Magnetic separator 21 Aluminum sorter 22 Unsuitable melting material 23 Slag 24 Sand 25 Non-combustible material 26 Iron 27 Aluminum 28 City gas 29 Air for flow 30 Waste plastics 31 Air preheater 32 Dust collector 33 Dust collection ash storage tank

Claims (7)

  1. 流動床式燃焼乾燥装置を具備し、溶融対象物を溶融炉に投入して溶融処理する前に該溶融対象物を、該流動床式燃焼乾燥装置に投入して乾燥させる溶融対象物の溶融前処理装置であって、
    流動床式燃焼乾燥装置は、装置内部が耐火物で施工され、流動媒体として粒径0.3mm〜0.8mmの砂が充填されている流動床部を具備し、該流動床部の下部から該砂を流動するための流動空気を吹き込み、必要に応じて流動している砂の上又は砂中で燃料を燃焼させ、該流動する砂の温度を200℃〜600℃若しくは400℃〜600℃に維持させると共に、該流動床部上に前記溶融対象物を投入し、流動乾燥排ガスと同伴する該溶融対象物を前記溶融炉に導入するようにし、該流動床部下部から前記溶融対象物中の流動乾燥排ガスに同伴されていない粗粒の不燃物及び金属を砂と伴に定期的若しくは連続的に排出する事ができる排出機構を備えたことを特徴とする溶融前処理装置。
    Prior to melting of an object to be melted that is provided with a fluidized bed combustion drying apparatus, and that the object to be melted is put into the fluidized bed combustion drying apparatus before being melted by being charged into the melting furnace. A processing device comprising:
    The fluidized bed combustion drying apparatus includes a fluidized bed part in which the inside of the apparatus is constructed with a refractory and is filled with sand having a particle size of 0.3 mm to 0.8 mm as a fluidized medium. Flowing air for flowing the sand is blown, and fuel is burned on or in the flowing sand as necessary, and the temperature of the flowing sand is set to 200 ° C to 600 ° C or 400 ° C to 600 ° C. The molten object is introduced onto the fluidized bed, and the molten object accompanied with the fluidized dry exhaust gas is introduced into the melting furnace, and the molten object is introduced into the molten object from the lower part of the fluidized bed. A melting pretreatment apparatus comprising a discharge mechanism capable of discharging coarse incombustibles and metals that are not accompanied by the fluidized dry exhaust gas with sand together periodically or continuously.
  2. 請求項1に記載の溶融前処理装置において、
    前記溶融対象物中の細粒物を風力選別により分級し、溶融炉に導くと共に、細粒溶融対象物の付着を伴わない粗粒物及び金属類を得ることを特徴とする溶融前処理装置。
    The melt pretreatment device according to claim 1,
    A pre-melting processing apparatus characterized by classifying fine particles in the object to be melted by wind sorting and guiding them to a melting furnace, and obtaining coarse particles and metals without adhering the fine particles to be melted.
  3. 請求項1又は2に記載の溶融前処理装置において、
    前記溶融対象物が、焼却灰、焼却飛灰、下水汚泥、し尿汚泥、若しくは最終処分地からの掘り起こし残渣、又はこれらの混合物であることを特徴とする溶融前処理装置。
    In the melting pretreatment apparatus according to claim 1 or 2,
    The melting pretreatment apparatus characterized in that the melting object is incineration ash, incineration fly ash, sewage sludge, human waste sludge, digging residue from a final disposal site, or a mixture thereof.
  4. 請求項1又は2又は3に記載の溶融前処理装置において、
    前記流動床式燃焼乾燥装置で使用する燃料は、A重油、灯油等の液体燃料、又は都市ガス、LPG等の気体燃料、又は石炭、コークス、RDF等の固形燃料であることを特徴とする溶融前処理装置。
    In the melting pretreatment device according to claim 1, 2 or 3,
    The fuel used in the fluidized bed combustion drying apparatus is a liquid fuel such as A heavy oil or kerosene, a gas fuel such as city gas or LPG, or a solid fuel such as coal, coke, or RDF. Pre-processing device.
  5. 請求項1乃至4に記載の溶融前処理装置において、
    前記流動床式燃焼乾燥装置で使用する燃料の一部若しくは燃料の代わりに廃プラスチック類、紙類、厨芥類、繊維類、草木類、ゴム類、廃油類等の可燃物をそれぞれ単独若しくは混合して使用することを特徴とする溶融前処理装置。
    The melting pretreatment apparatus according to claim 1, wherein
    Combustible materials such as waste plastics, papers, cocoons, fibers, vegetation, rubbers, waste oils, etc., alone or in combination with a part of the fuel used in the fluidized bed combustion drying apparatus or instead of the fuel. A melt pretreatment device characterized by being used.
  6. 溶融対象物を乾燥させる乾燥装置を有する前処理装置と該前処理装置で乾燥された溶融対象物を溶融する溶融炉を具備する溶融装置において、
    前記前処理装置の乾燥装置に請求項1乃至5のいずれか1項に記載の流動床式燃焼乾燥装置を用い、該流動床式燃焼乾燥装置から排出される乾燥された溶融対象物中の細粒物若しくは微細な溶融物を同伴した乾燥ガスを、直後後段の前記溶融炉に導入して当該細粒物若しくは微細な溶融対象物を溶融することを特徴とする溶融装置。
    In a melting apparatus comprising a pretreatment device having a drying device for drying an object to be melted and a melting furnace for melting an object to be melted dried by the pretreatment device,
    The fluidized bed combustion drying device according to any one of claims 1 to 5 is used as a drying device of the pretreatment device, and fine particles in a dried molten object discharged from the fluidized bed combustion drying device are used. A melting apparatus, wherein a dry gas accompanied by a granular material or a fine melt is introduced immediately afterwards into the subsequent melting furnace to melt the fine granule or the fine melting object.
  7. 溶融対象物を乾燥させる乾燥装置を有する前処理装置と該前処理装置で乾燥された溶融対象物を溶融する溶融炉を具備する溶融装置において、
    前記前処理装置の乾燥装置に請求項1乃至5のいずれか1項に記載の流動床式燃焼乾燥装置を用い、該流動床式燃焼乾燥装置から排出される乾燥された溶融対象物中の細粒物若しくは微細な溶融対象物を同伴した乾燥排ガスを、集塵装置に導入して、該集塵装置で集塵した細粒物若しくは微細な溶融対象物を溶融炉に導入することを特徴とする溶融装置。
    In a melting apparatus comprising a pretreatment device having a drying device for drying an object to be melted and a melting furnace for melting an object to be melted dried by the pretreatment device,
    The fluidized bed combustion drying device according to any one of claims 1 to 5 is used as a drying device of the pretreatment device, and fine particles in a dried molten object discharged from the fluidized bed combustion drying device are used. It is characterized in that dry exhaust gas accompanied by granular materials or fine melting objects is introduced into a dust collector, and fine particles or fine melting objects collected by the dust collector are introduced into a melting furnace. Melting equipment to do.
JP2003296905A 2003-08-20 2003-08-20 Melting pretreatment apparatus and melting apparatus Pending JP2005066417A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009268956A (en) * 2008-05-02 2009-11-19 Kanae Co Ltd Method for treating jellyfishes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009268956A (en) * 2008-05-02 2009-11-19 Kanae Co Ltd Method for treating jellyfishes

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