JP2007309831A - Treating method of waste blast material - Google Patents

Treating method of waste blast material Download PDF

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JP2007309831A
JP2007309831A JP2006140444A JP2006140444A JP2007309831A JP 2007309831 A JP2007309831 A JP 2007309831A JP 2006140444 A JP2006140444 A JP 2006140444A JP 2006140444 A JP2006140444 A JP 2006140444A JP 2007309831 A JP2007309831 A JP 2007309831A
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waste
hard plastic
plastic particles
blast material
treating
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JP2006140444A
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Japanese (ja)
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Takeshi Yoshida
健 吉田
Hisaki Fukui
寿樹 福井
Manabu Kishimoto
学 岸本
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IHI Corp
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IHI Corp
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treating method of a waste blast material capable of reducing a generation amount of the waste blast material which is a radioactive secondary waste, and putting the final waste form into a stable state from the viewpoint of elution of a radioactive material. <P>SOLUTION: In this treating method of the waste blast material for decontaminating a polluted treating object such as a metal or ceramics in a nuclear-related facility by using a blast material, and then treating the blast material, hard plastic particles are used as the blast material, and the hard plastic particles after blast treatment are recovered, and then the waste 10 comprising the hard plastic particles is heated and decomposed by a gasification volume reduction device 11, to thereby reduce the volume of the secondary waste. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、原子力発電所のタービンブレードなどの除染処理する際の廃ブラスト材の処理方法に関するものである。   The present invention relates to a method for treating a waste blast material when decontaminating a turbine blade or the like of a nuclear power plant.

従来、原子力発電所の供用期間中の定期点検において、タービンブレードの除染処理のために、砂をブラスト材として用いたサンドブラスト、セラミックを用いたブラスト処理（特許文献１，２）が行われている。   Conventionally, sand blasting using sand as a blasting material and blasting using ceramics (Patent Documents 1 and 2) have been performed for decontamination of turbine blades in periodic inspections during the operation period of nuclear power plants. Yes.

特開平０９−２１８９８号公報JP 09-21898 A 特開平０５−１０４４４２号公報Japanese Patent Laid-Open No. 05-104442

しかしながら、原子力関係設備で使用されたブラスト材は、除染の際に放射能汚染され、管理保管及び処分しなくてはならない低レベル放射性廃棄物になること、またそれが多量に発生することが課題となっている。   However, blasting materials used in nuclear facilities may be radioactively contaminated during decontamination, resulting in low-level radioactive waste that must be managed and stored and disposed of in large quantities. It has become a challenge.

そこで、本発明の目的は、上記課題を解決し、上記のような放射性二次廃棄物となる廃ブラスト材の発生量を低減及び最終的な廃棄物の形態が、放射性物質の溶出の観点より安定した状態にできる廃ブラスト材の処理方法を提供することにある。   Therefore, the object of the present invention is to solve the above-mentioned problems, reduce the amount of waste blasting material that becomes radioactive secondary waste as described above, and form the final waste from the viewpoint of elution of radioactive materials. An object of the present invention is to provide a method for treating a waste blast material that can be in a stable state.

上記目的を達成するために請求項１の発明は、原子力関係設備内の金属やセラミックスなどの汚染処理対象物をブラスト材を用いて除染した後、その放射性物質で汚染されたブラスト材を処理するための廃ブラスト材の処理方法において、ブラスト材に硬質プラスチック粒子を用い、そのブラスト処理後の硬質プラスチック粒子を回収した後、その硬質プラスチック粒子を加熱分解させて二次廃棄物の減容を行うことを特徴とする廃ブラスト材の処理方法である。   In order to achieve the above object, the invention of claim 1 is directed to treating a blasting material contaminated with a radioactive substance after decontaminating a contamination processing object such as metal or ceramics in a nuclear facility using a blasting material. In the processing method of waste blasting materials, the hard plastic particles are used for the blasting material, and after the hard plastic particles are recovered, the hard plastic particles are thermally decomposed to reduce the volume of secondary waste. It is a processing method of the waste blast material characterized by performing.

請求項２の発明は、ブラスト処理後の回収した硬質プラスチック粒子を、ガス化減容装置に導入して熱分解させて廃棄物の減容を行う請求項１記載の廃ブラスト材の処理方法である。   The invention according to claim 2 is a method for treating waste blasting material according to claim 1, wherein the hard plastic particles recovered after blasting are introduced into a gasification and volume reducing device and thermally decomposed to reduce the volume of waste. is there.

請求項３の発明は、ガス化減容装置で熱分解された分解ガスを二次燃焼器に導入して燃焼させ、その燃焼排ガスを水洗浄した後、除塵して排気する請求項２記載の廃ブラスト材の処理方法である。   According to a third aspect of the present invention, the cracked gas thermally decomposed by the gasification and volume reducing device is introduced into the secondary combustor for combustion, and the combustion exhaust gas is washed with water, and then dust is removed and exhausted. It is a processing method of waste blast material.

本発明によれば、ブラスト材に硬質プラスチックを用いることで、ブラスト性能を維持し、しかも回収後のブラスト材を熱分解にてガス化することで二次廃棄物の減容が行え、廃棄物の発生量を低減することができるという優れた効果を発揮するものである。   According to the present invention, by using a hard plastic for the blasting material, the blasting performance is maintained, and the volume of the secondary waste can be reduced by gasifying the recovered blasting material by pyrolysis. This produces an excellent effect of reducing the amount of generation of.

以下、本発明の好適な一実施の形態を添付図面に基づいて詳述する。   A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

先ず、ブラスト材としてメラミン樹脂（Ｃ３Ｎ３（ＮＨ２）３＋ＨＣＨＯ；比重１．４７〜１．５２）、スチロール樹脂、ポリプロピレン等、曲げ弾性率が定常状態で７０００ｋｇ／ｃｍ２ 以上の熱可塑性樹脂からなる硬質プラスチックを用い、粒径としては、０．５〜３ｍｍのものを使用する。   First, a hard plastic made of a melamine resin (C3N3 (NH2) 3 + HCHO; specific gravity 1.47 to 1.52), styrene resin, polypropylene, or the like as a blast material is made of a thermoplastic resin having a bending elastic modulus of 7000 kg / cm 2 or more in a steady state. A particle diameter of 0.5 to 3 mm is used.

この硬質プラスチック粒子を除染すべき、原子力関係設備内の金属やセラミックスなどの汚染処理対象物、例えばタービンブレードに空気と共に噴射してブラスト処理を行いブレードに付着した被汚染物質を除去する。ブラスト後の硬質プラスチック粒子を回収し、これを廃棄物として図１に示した処理装置にて減容化処理を行う。   The hard plastic particles to be decontaminated, such as metals and ceramics in nuclear facilities, for example, turbine blades are jetted together with air and blasted to remove contaminants attached to the blades. The hard plastic particles after blasting are collected, and this is treated as waste to reduce the volume using the processing apparatus shown in FIG.

すなわち、汚染物質を含む硬質プラスチック粒子からなる廃棄物１０をバッチ式ガス化減容装置１１に投入し、加熱空気と加熱窒素１２をガス化減容装置１１に供給しつつヒータ１３で加熱する。   That is, the waste 10 made of hard plastic particles containing contaminants is put into a batch-type gasification and volume reduction device 11 and heated by the heater 13 while supplying heated air and heated nitrogen 12 to the gasification and volume reduction device 11.

メラミン樹脂などは、２００〜３００℃でガス化が起こり、５００〜６００℃で完全に熱分解される。   The melamine resin and the like are gasified at 200 to 300 ° C. and completely pyrolyzed at 500 to 600 ° C.

発生した分解ガスは、ライン１４より二次燃焼器１５に供給され、また廃棄物１０中、熱分解しなかった二次廃棄物は、トレイ１６に回収される。   The generated cracked gas is supplied from the line 14 to the secondary combustor 15, and the secondary waste that has not been thermally decomposed in the waste 10 is collected in the tray 16.

二次燃焼器１５では、燃焼空気１７とプロパンなどの補助燃料１８を供給して分解ガスを燃焼処理し、燃焼排ガスはライン２０より水スクラバーなどの水洗浄器２１に導入され、そこで水噴射により洗浄された後、ライン２２からミストフィルタ２３に導入されて、ミスト分が除去されると共に除塵されて排気ブロア２４から排気塔２５より排気される。   In the secondary combustor 15, combustion air 17 and auxiliary fuel 18 such as propane are supplied to burn the cracked gas, and the combustion exhaust gas is introduced into a water scrubber 21 such as a water scrubber from a line 20, where water injection is performed. After being washed, it is introduced into the mist filter 23 from the line 22, and the mist content is removed and the dust is removed and exhausted from the exhaust tower 25 through the exhaust blower 24.

また水洗浄器２１に溜まった洗浄水は循環ポンプ２６にて水洗浄器２１のスプレーノズル２８に循環供給される。   The wash water collected in the water washer 21 is circulated and supplied to the spray nozzle 28 of the water washer 21 by the circulation pump 26.

このように、ブラスト材として硬質プラスチック粒子を用いることで、従来のサンドブラストと同等のブラスト処理が行え、しかも回収後の硬質プラスチック粒子は、熱分解処理することができるため、多量にブラスト材を用いても、減容化処理が容易であり、二次汚染された廃棄物の発生量を低減できる。   In this way, by using hard plastic particles as the blast material, blast processing equivalent to conventional sand blasting can be performed, and the recovered hard plastic particles can be pyrolyzed, so a large amount of blast material is used. However, volume reduction treatment is easy, and the amount of secondary-contaminated waste generated can be reduced.

これに伴い、管理保管費及び処分費を低減させることができる。   Accordingly, management storage costs and disposal costs can be reduced.

本発明において廃ブラスト材を処理する装置を示す図である。It is a figure which shows the apparatus which processes waste blast material in this invention.

符号の説明Explanation of symbols

１０ 廃棄物（ブラスト材）
１１ ガス化減容装置
１５ 二次燃焼器
10 Waste (blasting material)
11 Gasification volume reduction device 15 Secondary combustor

Claims (3)

原子力関係設備内の金属やセラミックスなどの汚染処理対象物をブラスト材を用いて除染した後、その放射性物質で汚染されたブラスト材を処理するための廃ブラスト材の処理方法において、ブラスト材に硬質プラスチック粒子を用い、そのブラスト処理後の硬質プラスチック粒子を回収した後、その硬質プラスチック粒子を加熱分解させて二次廃棄物の減容を行うことを特徴とする廃ブラスト材の処理方法。   After decontamination of contamination processing objects such as metals and ceramics in nuclear facilities using blasting material, in the processing method of waste blasting material for processing blasting material contaminated with the radioactive material, A method for treating a waste blasting material, comprising using hard plastic particles, recovering the hard plastic particles after the blast treatment, and then thermally decomposing the hard plastic particles to reduce the volume of secondary waste. ブラスト処理後の回収した硬質プラスチック粒子を、ガス化減容装置に導入して熱分解させて廃棄物の減容を行う請求項１記載の廃ブラスト材の処理方法。   The method for treating a waste blasting material according to claim 1, wherein the hard plastic particles recovered after the blasting treatment are introduced into a gasification and volume reducing device and thermally decomposed to reduce the volume of waste. ガス化減容装置で熱分解された分解ガスを二次燃焼器に導入して燃焼させ、その燃焼排ガスを水洗浄した後、除塵して排気する請求項２記載の廃ブラスト材の処理方法。
The method for treating a waste blasting material according to claim 2, wherein the cracked gas thermally decomposed by the gasification and volume reducing device is introduced into the secondary combustor and burned, the combustion exhaust gas is washed with water, and then dust is removed and exhausted.
JP2006140444A 2006-05-19 2006-05-19 Treating method of waste blast material Pending JP2007309831A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013217758A (en) * 2012-04-09 2013-10-24 Konoe Takashi Radioactive nuclide concentration and recovery method and recovery system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0761612B2 (en) * 1988-11-22 1995-07-05 株式会社不二機販 Cleaning method of turbine for power generation of boiling water nuclear power plant
JP2002181994A (en) * 2000-12-19 2002-06-26 Fuji Electric Co Ltd Volume reduction equipment for radioactive waste and its operation method
JP2006507108A (en) * 2002-07-31 2006-03-02 スタッズビク インコーポレイテッド In-drum pyrolysis system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0761612B2 (en) * 1988-11-22 1995-07-05 株式会社不二機販 Cleaning method of turbine for power generation of boiling water nuclear power plant
JP2002181994A (en) * 2000-12-19 2002-06-26 Fuji Electric Co Ltd Volume reduction equipment for radioactive waste and its operation method
JP2006507108A (en) * 2002-07-31 2006-03-02 スタッズビク インコーポレイテッド In-drum pyrolysis system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013217758A (en) * 2012-04-09 2013-10-24 Konoe Takashi Radioactive nuclide concentration and recovery method and recovery system

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