JP5651885B2 - Ion exchange resin volume reduction treatment system and ion exchange resin volume reduction treatment method - Google Patents
Ion exchange resin volume reduction treatment system and ion exchange resin volume reduction treatment method Download PDFInfo
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Description
本発明は、イオン交換樹脂の減容処理システムおよびイオン交換樹脂の減容処理方法に関するものである。 The present invention relates to an ion exchange resin volume reduction treatment system and an ion exchange resin volume reduction treatment method.
原子力発電所では、機器の腐食防止のため、系統水の浄化や系統に注入する水の浄化に大量のイオン交換樹脂が使用されている。これらのイオン交換樹脂は性能が経年劣化するため、所定期間使用した後、廃棄物となる。従来、原子力発電所で発生する使用済のイオン交換樹脂は、放射能レベルにより分別され、それぞれ貯蔵タンクに水とともに貯留されていた。 In nuclear power plants, a large amount of ion exchange resin is used to purify system water and water injected into the system to prevent corrosion of equipment. Since these ion-exchange resins deteriorate in performance over time, they become waste after being used for a predetermined period. Conventionally, used ion exchange resins generated at nuclear power plants are sorted by radioactivity level and stored together with water in storage tanks.
イオン交換樹脂は自然状態では安定で難分解性であるという特性を有するが、有機物質であるため長期的には変質する可能性もある。したがって、使用済のイオン交換樹脂を廃棄物として処分する際には、無機化し安定化することが必要となる。 The ion exchange resin has a characteristic that it is stable and hardly decomposable in a natural state, but since it is an organic substance, it may be deteriorated in the long term. Therefore, when disposing of the used ion exchange resin as waste, it is necessary to make it mineralized and stabilized.
これらの、原子力発電所で発生する使用済のイオン交換樹脂の処理方法として、焼却処理、熱分解処理、酸化分解処理など様々な無機化減容技術が開発されており、現在、一部の原子力発電所では、放射能レベルが低いものについて、８００℃以上の高温焼却処理が行われている。一方、放射能レベルが比較的高いものについては、高温焼却処理時に使用される処理炉を構成する耐火物の処理問題や、高温焼却に伴うＣｓの飛散の問題などがあり、高温焼却処理の採用は困難であり、そのまま水とともに貯蔵タンクに貯留されているのが現状である。 Various mineralization volume reduction technologies such as incineration treatment, thermal decomposition treatment, and oxidative decomposition treatment have been developed as a treatment method for these used ion exchange resins generated at nuclear power plants. At power plants, high-temperature incineration processing at 800 ° C. or higher is performed for those with low radioactivity levels. On the other hand, those with relatively high levels of radioactivity have problems with the treatment of refractories that constitute the processing furnace used during high-temperature incineration, and the problem of Cs scattering associated with high-temperature incineration. Is difficult and is currently stored in a storage tank together with water.
これらの問題に対し、本願出願人は、ボール型乾留炉を使用して、耐火物を使用することなく、金属製の閉鎖系反応容器内で使用済イオン交換樹脂を無機化減容処理する技術を開示している（特許文献１）。 In response to these problems, the applicant of the present application uses a ball-type carbonization furnace to make a used ion-exchange resin mineralized in a metal closed system reaction vessel without using a refractory. (Patent Document 1).
しかし、原子力発電所で発生する使用済のイオン交換樹脂には、陽イオン交換樹脂と陰イオン交換樹脂とがあり、従来のボール型乾留炉を使用して減容処理を行った場合、陰イオン交換樹脂は良好な減容率（１/２０程度）で処理されるが、陽イオン交換樹脂の減容率は１/２程度に留まり、通常これらが１：１の割合で混合された廃樹脂の減容率は１/４程度に留まり、近年の減容率向上の需要に十分には対応できていない問題があった。 However, used ion exchange resins generated at nuclear power plants include cation exchange resins and anion exchange resins. When volume reduction treatment is performed using a conventional ball-type carbonization furnace, anion ions are used. The exchange resin is treated with a good volume reduction rate (about 1/20), but the volume reduction rate of the cation exchange resin is only about 1/2, and it is usually a waste resin in which these are mixed at a ratio of 1: 1. However, the volume reduction rate was only about 1/4, and there was a problem that the demand for improvement in volume reduction rate in recent years could not be sufficiently met.
そこで、本願出願人は、ボール型乾留炉を利用した減容処理に際し、乾留炉内に過熱蒸気を供給しながらイオン交換樹脂の減容処理を行う技術を開発し、特願２０１０−２６９８８７号として出願済である。 Therefore, the applicant of the present application has developed a technique for reducing the volume of the ion exchange resin while supplying superheated steam into the carbonization furnace in the volume reduction process using a ball-type carbonization furnace, as Japanese Patent Application No. 2010-269887. The application has been filed.
一方、使用済イオン交換樹脂は貯蔵タンクより通常５〜１５％程度のスラリーで樹脂受入タンクに移送、一時貯留され、このように水分含有率の高いイオン交換樹脂を、そのまま特許文献１記載のボール型乾留炉に供給する場合、多量の水分の蒸発のためにボール型乾留炉のボール充填部を大型化し、更に、ボール型乾留炉の後段に配置される排ガス処理系も大型化することが必要となり、減容処理施設のコンパクト化の観点からは好ましくないという問題があった。 On the other hand, the spent ion exchange resin is usually transferred to the resin receiving tank as a slurry of about 5 to 15% from the storage tank and temporarily stored. Thus, the ion exchange resin having a high water content is used as it is in the ball described in Patent Document 1. When supplying to a dry distillation furnace, it is necessary to increase the size of the ball filling section of the ball-type dry distillation furnace in order to evaporate a large amount of water, and also to increase the size of the exhaust gas treatment system arranged at the subsequent stage of the ball-type dry distillation furnace. Therefore, there is a problem that it is not preferable from the viewpoint of making the volume reduction treatment facility compact.
本発明の目的は前記を解決し、ボール型乾留炉内に過熱蒸気を供給しながら減容処理を行うイオン交換樹脂の減容処理システムにおいて、ボール型乾留炉の小型化およびボール型乾留炉の前段や後段に配置される設備の小型化による減容処理施設のコンパクト化を実現する技術を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and in an ion exchange resin volume reduction treatment system that performs volume reduction treatment while supplying superheated steam into a ball type carbonization furnace, It is to provide a technology that realizes a compact volume reduction treatment facility by downsizing the equipment arranged in the front and rear stages.
上記課題を解決するためになされた本発明のイオン交換樹脂の減容処理システムは、使用済イオン交換樹脂の樹脂受入タンクと、該樹脂受入タンクに貯蔵された高含水率のスラリーを脱水する脱水機と、脱水後のスラリーを無機化減容処理するボール型乾留炉と、該ボール型乾留炉の後段に配置された排ガス処理手段とからなるイオン交換樹脂の減容処理システムであって、該ボール型乾留炉は、金属製の密閉式反応容器と、該容器の下部に配置された粉体貯留部からなり、該密閉式反応容器は、外部加熱手段と、該容器内に充填されたセラミック製または金属製のボールと、該ボールを機械的に撹拌できる撹拌翼と、該容器の上部から該ボール上へ、室温のイオン交換樹脂を供給するイオン交換樹脂供給ノズルと、該容器の上部から該ボール上へ過熱水蒸気を供給する過熱水蒸気供給ノズルを備え、該粉体貯留部は、貯留部内温度を維持する外部電気式ヒータを備え、該脱水機の後段には、脱水された脱水液を過熱水蒸気化し、該ボール型乾留炉の過熱水蒸気供給ノズルへと供給する過熱水蒸気供給手段を備えることを特徴とするものである。 An ion exchange resin volume reduction treatment system of the present invention made to solve the above-mentioned problems is a resin receiving tank for used ion exchange resin, and a dehydration for dehydrating a slurry having a high water content stored in the resin receiving tank. An ion exchange resin volume reduction treatment system comprising: a machine, a ball type carbonization furnace for mineralizing and reducing the slurry after dehydration, and an exhaust gas treatment means disposed at a subsequent stage of the ball type carbonization furnace, The ball-type dry distillation furnace comprises a metal-made sealed reaction vessel and a powder reservoir disposed at the lower part of the vessel, and the sealed reaction vessel comprises an external heating means and a ceramic filled in the vessel. A metal or metal ball, a stirring blade capable of mechanically stirring the ball, an ion exchange resin supply nozzle for supplying an ion exchange resin at room temperature from the upper part of the container onto the ball, and an upper part of the container Bo A superheated steam supply nozzle for supplying superheated steam to the top, the powder storage section is provided with an external electric heater for maintaining the temperature in the storage section, and the dehydrated dehydrated liquid is superheated with steam after the dehydrator And a superheated steam supply means for supplying to the superheated steam supply nozzle of the ball-type dry distillation furnace.
請求項２記載の発明は、請求項１記載のイオン交換樹脂の減容処理システムを使用するイオン交換樹脂の減容処理方法であって、樹脂受入タンクに貯蔵されたイオン交換樹脂の５〜１５％スラリーを、脱水機での脱水により４０〜６０％スラリーとし、脱水液を過熱水蒸気化した過熱水蒸気および該４０〜６０％スラリーを金属製の密閉式反応容器に供給して、イオン交換樹脂を４００℃以上の過熱水蒸気と接触させる過熱水蒸気接触工程と、該過熱水蒸気接触工程を経たイオン交換樹脂を、更に、４６０℃以上の雰囲気温度下で処理する追加熱処理工程からなることを特徴とするものである。 The invention described in claim 2 is an ion exchange resin volume reduction processing method using the ion exchange resin volume reduction processing system according to claim 1, wherein 5 to 15 of the ion exchange resin stored in the resin receiving tank is provided. % Slurry is made into a 40-60% slurry by dehydration in a dehydrator, and the dehydrated liquid is superheated and steamed, and the 40-60% slurry is supplied to a metal sealed reaction vessel to obtain an ion exchange resin. A superheated steam contact step for contacting with superheated steam at 400 ° C. or higher, and an additional heat treatment step for treating the ion exchange resin that has undergone the superheated steam contact step at an atmospheric temperature of 460 ° C. or higher. It is.
請求項３記載の発明は、請求項２記載のイオン交換樹脂の減容処理方法において、イオン交換樹脂が原子力発電所で発生する使用済のイオン交換樹脂であることを特徴とするものである。 According to a third aspect of the present invention, in the method for reducing the volume of an ion exchange resin according to the second aspect, the ion exchange resin is a used ion exchange resin generated at a nuclear power plant.
本発明のイオン交換樹脂の減容処理システムでは、ボール型乾留炉内に過熱蒸気を供給しながら減容処理を行うイオン交換樹脂の減容処理システムにおいて、ボール型乾留炉の前段に脱水機を配置し、脱水後のスラリーをボール型乾留炉内に投入する構成により、従来、多量の水分の蒸発のために大型化していたボール型乾留炉のボール充填部、および、ボール型乾留炉の後段に配置される排ガス処理系の小型化が実現可能となる。更に、脱水液を過熱蒸気として利用する構成により、別途脱水液の専用処理施設を別途設ける必要がなく、前記ボール充填部、および、排ガス処理系の小型化と合わせて、減容処理施設のコンパクト化を実現することができる。 In the ion exchange resin volume reduction treatment system of the present invention, in the ion exchange resin volume reduction treatment system that performs volume reduction treatment while supplying superheated steam into the ball type dry distillation furnace, a dehydrator is installed in the front stage of the ball type dry distillation furnace. By placing the slurry after dehydration into the ball-type carbonization furnace, the ball filling unit of the ball-type carbonization furnace, which has been increased in size for evaporation of a large amount of water, and the subsequent stage of the ball-type carbonization furnace It is possible to reduce the size of the exhaust gas treatment system disposed in In addition, since the dehydrating liquid is used as superheated steam, there is no need to provide a dedicated dehydrating liquid processing facility, and the volume reduction processing facility is compact in combination with the downsizing of the ball filling unit and the exhaust gas processing system. Can be realized.
以下に本発明の好ましい実施形態を示す。
図１において、１は原子力発電所で発生する使用済のイオン交換樹脂を一時貯蔵する樹脂受入タンク、２は該樹脂受入タンクに貯蔵された高含水率のスラリーを脱水する脱水機、３は脱水後のスラリーを無機化減容処理するボール型乾留炉、４は脱水機で脱水された脱水液を過熱水蒸気化し、該ボール型乾留炉内へ供給する過熱水蒸気供給手段、５は排ガス処理系を構成する排ガス処理手段である。
Preferred embodiments of the present invention are shown below.
In FIG. 1, 1 is a resin receiving tank for temporarily storing used ion exchange resin generated at a nuclear power plant, 2 is a dehydrator for dehydrating a slurry having a high water content stored in the resin receiving tank, and 3 is dehydrating. A ball-type dry distillation furnace for subjecting the slurry to a mineralization and volume reduction treatment, 4 is a superheated steam supply means for dehydrating the dehydrated liquid dehydrated by a dehydrator, and supplying it into the ball-type dry distillation furnace, 5 is an exhaust gas treatment system This is an exhaust gas treatment means.
樹脂受入タンク１には、使用済のイオン交換樹脂が５〜１５％スラリー（樹脂５〜１５％、水分８５〜９５％）として貯留されている。 In the resin receiving tank 1, used ion exchange resin is stored as 5 to 15% slurry (resin 5 to 15%, moisture 85 to 95%).
該５〜１５％スラリーは、樹脂供給ポンプ６により、脱水機２に供給され、ここで４０〜６０％スラリー（樹脂４０〜６０％、水分６０〜４０％）にまで脱水される。脱水機の種類は特に限定されず、例えば、スクリュー式脱水機や遠心脱水機を採用することができる。 The 5 to 15% slurry is supplied to the dehydrator 2 by the resin supply pump 6 and dehydrated to 40 to 60% slurry (resin 40 to 60%, moisture 60 to 40%). The kind of dehydrator is not particularly limited, and for example, a screw dehydrator or a centrifugal dehydrator can be employed.
脱水機２から排出される脱水液は、一旦、脱水液受入れタンク７に受け入れた後、脱水液供給ポンプ８により蒸気発生器９に送られ、蒸気発生器９及び蒸気過熱器１０により過熱蒸気化される。一方、脱水後の４０〜６０％スラリーは、ボール型乾留炉３へと供給される。 The dehydrating liquid discharged from the dehydrator 2 is once received in the dehydrating liquid receiving tank 7, then sent to the steam generator 9 by the dehydrating liquid supply pump 8, and superheated by the steam generator 9 and the steam superheater 10. Is done. On the other hand, the 40-60% slurry after dehydration is supplied to the ball-type dry distillation furnace 3.
ボール型乾留炉３は、ボール充填部である金属製の密閉式反応容器１１、該容器の内部温度を反応時に４００〜７００℃にまで上昇する外部ヒータ１２、該容器の内部に充填されたセラミック製または金属製のボール１３、該ボールを機械的に撹拌できる撹拌翼（図示略）、該容器の上部から該ボール上へイオン交換樹脂を供給するイオン交換樹脂供給ノズル１４、該容器の上部から該ボール１３上へ４００〜７００℃の過熱水蒸気を供給する過熱水蒸気供給ノズル１５から構成されている。 The ball-type dry distillation furnace 3 includes a metal sealed reaction vessel 11 serving as a ball filling unit, an external heater 12 that raises the internal temperature of the vessel to 400 to 700 ° C. during the reaction, and a ceramic filled in the vessel A metal or metal ball 13, a stirring blade (not shown) capable of mechanically stirring the ball, an ion exchange resin supply nozzle 14 for supplying an ion exchange resin from the upper part of the container onto the ball, and an upper part of the container The superheated steam supply nozzle 15 is configured to supply superheated steam at 400 to 700 ° C. onto the balls 13.
密閉式反応容器１１は、径が例えば４００ｍｍで長さが５００ｍｍである金属製の円筒体を立設して構成され、反応容器内の圧力を−０．５〜−１０ｋＰａに維持する圧力制御手段と、該容器１の内部温度を反応時に４００〜７００℃にまで上昇する外部電気式ヒータ１２を備えている。 The sealed reaction vessel 11 is configured by standing a metal cylinder having a diameter of, for example, 400 mm and a length of 500 mm, and maintains the pressure in the reaction vessel at −0.5 to −10 kPa. And an external electric heater 12 that raises the internal temperature of the container 1 to 400 to 700 ° C. during the reaction.
この円筒体の軸心部には、密閉式反応容器１１の上部に設置された駆動モータによって低速（約０．１〜２rpm）で回転される回転軸が設けられている。この回転軸の周部には、外縁が前記円筒体の内周面に近接位置されるように、また内縁が回転軸との間に空間を形成するようにして螺旋翼である撹拌翼が取り付けられている。 A rotating shaft that is rotated at a low speed (about 0.1 to 2 rpm) by a drive motor installed at the top of the sealed reaction vessel 11 is provided at the axial center of the cylindrical body. A stirring blade, which is a spiral blade, is attached to the periphery of the rotating shaft so that the outer edge is positioned close to the inner peripheral surface of the cylindrical body and the inner edge forms a space with the rotating shaft. It has been.
密閉式反応容器１１内のボール１３は、耐蝕性のあるセラミックボールあるいは、高ニッケル系合金であるハステロイ又はインコネル製であって、１０〜２５ｍｍの粒径を有し、該撹拌翼４により撹拌されながら密閉式反応容器１内の周縁部を上昇し、これに伴って形成される空間部に、密閉式反応容器１内の上部に位置しているボールが順次下降していく。 The ball 13 in the sealed reaction vessel 11 is made of a corrosion-resistant ceramic ball or a high nickel-based alloy Hastelloy or Inconel and has a particle diameter of 10 to 25 mm and is stirred by the stirring blade 4. However, the peripheral part in the sealed reaction vessel 1 is raised, and the balls located at the upper part in the sealed reaction vessel 1 are sequentially lowered into the space formed accordingly.
イオン交換樹脂を密閉式反応容器１１内へ供給するイオン交換樹脂供給ノズル１４の前段にはスクリューフィーダ式の供給手段１９を備えてイオン交換樹脂を均等に供給することが好ましい。 It is preferable that a screw feeder type supply means 19 is provided upstream of the ion exchange resin supply nozzle 14 for supplying the ion exchange resin into the sealed reaction vessel 11 to supply the ion exchange resin evenly.
イオン交換樹脂供給ノズル１４から密閉式反応容器１１内に供給されたイオン交換樹脂は初期には４０〜６０％スラリーの含水状態であり、基本的にはボール１３の表面に付着して、炉内を移動する。このためイオン交換樹脂の密閉式反応容器１１での滞留時間はボールの下降時間と同じである。ボールの下降時間は、撹拌翼の寸法、回転数、ボールの寸法、充填層高さで自由に調節可能であるが、ボールの下降時間（すなわち、イオン交換樹脂の密閉式反応容器１での滞留時間）は減容率向上には長い程好ましい。具体的には、ボールの径を小さくする、回転軸の回転数を小さくする、ボールが充填される層の長さを長くする方法を採用することができる。 The ion exchange resin supplied into the sealed reaction vessel 11 from the ion exchange resin supply nozzle 14 is initially in a water-containing state of 40 to 60% slurry, and basically adheres to the surface of the ball 13 and is in the furnace. To move. For this reason, the residence time of the ion exchange resin in the sealed reaction vessel 11 is the same as the ball descent time. The ball descent time can be freely adjusted by the size of the stirring blade, the number of revolutions, the ball size, and the height of the packed bed, but the ball descent time (that is, retention of the ion exchange resin in the sealed reaction vessel 1) The longer the time) is, the better the volume reduction rate is. Specifically, a method of reducing the diameter of the ball, reducing the rotation speed of the rotating shaft, or increasing the length of the layer filled with the ball can be employed.
密閉式反応容器１１の上部に備えた過熱水蒸気供給ノズル１５からは、ボール１３の表面に付着したイオン交換樹脂へ４００〜７００℃の過熱水蒸気を供給する。イオン交換樹脂は室温で供給されるため、密閉式反応容器１１の上層部では、２００〜３００℃の低温領域をイオン交換樹脂は通過する。 Superheated steam at 400 to 700 ° C. is supplied to the ion exchange resin attached to the surface of the ball 13 from the superheated steam supply nozzle 15 provided in the upper part of the sealed reaction vessel 11. Since the ion exchange resin is supplied at room temperature, the ion exchange resin passes through a low temperature region of 200 to 300 ° C. in the upper layer portion of the sealed reaction vessel 11.
イオン交換基の分離が生じる温度領域（２００〜３００℃における第２段階）を通過する際に、過熱水蒸気を流速０．１ｍ/ｓ以上で供給しつつボールを撹拌し、イオン交換樹脂と過熱水蒸気を効率よく接触させている。これにより、従来に比較して、イオン交換樹脂全体の減容率を顕著に改善可能としている。具体的には、例えば、従来の乾留法では減容率が１／２程度であったものにつき、当該イオン交換樹脂と過熱水蒸気を効率よく接触させながら処理する方法を採用することにより、１／４程度にまで改善することができる。 When passing through a temperature range (second stage at 200 to 300 ° C.) where ion exchange group separation occurs, the ball is agitated while supplying superheated steam at a flow rate of 0.1 m / s or more, and the ion exchange resin and superheated steam are supplied. Is in efficient contact. Thereby, compared with the past, the volume reduction rate of the whole ion exchange resin can be remarkably improved. Specifically, for example, by adopting a method in which the ion exchange resin and superheated steam are efficiently brought into contact with each other when the volume reduction rate is about 1/2 in the conventional dry distillation method, 1 / It can be improved to about 4.
密閉式反応容器１１内での分解によって発生した残渣（主に酸化鉄）は、粉体貯留部１６に排出され、密閉式反応容器１１内に堆積する残渣処理に伴う各種問題も効果的に回避可能な構造となっている。該粉体貯留部１６の温度を、ポリスチレンの分解温度以上の４６０℃以上、好ましくは５００℃以上に管理することにより、更に、減容率を１／２０にまで大幅に向上させることができる。温度を維持するための手段は、粉体貯留部外部電気式ヒータ（図示略）、粉体貯留部過熱水蒸気ノズル（図示略）、またはその組み合わせで実施することができる。 Residues (mainly iron oxide) generated by the decomposition in the sealed reaction vessel 11 are discharged to the powder storage unit 16, and various problems associated with the residue processing accumulated in the sealed reaction vessel 11 are effectively avoided. It has a possible structure. By controlling the temperature of the powder reservoir 16 to 460 ° C. or higher, preferably 500 ° C. or higher, which is higher than the decomposition temperature of polystyrene, the volume reduction rate can be further improved to 1/20. The means for maintaining the temperature can be implemented by a powder reservoir external electric heater (not shown), a powder reservoir superheated steam nozzle (not shown), or a combination thereof.
密閉式反応容器１１内での分解によって発生した分解ガス（CO、CxHy）及び、硫酸ガス、亜硫酸ガスなどは、焼結金属フィルタ１７を経て排ガス出口１８から排出され、後段の二次燃焼器、洗浄塔などの排ガス処理系で処理されるため、原子力発電所で発生する使用済のイオン交換樹脂を、放射能による環境汚染の危険を伴わず安全に減容処理することができる。焼結金属フィルタ１７をセラミックフィルタとすることも可能である。 Decomposed gases (CO, CxHy), sulfuric acid gas, sulfurous acid gas, and the like generated by the decomposition in the sealed reaction vessel 11 are discharged from the exhaust gas outlet 18 through the sintered metal filter 17, and the secondary combustor at the subsequent stage, Since it is treated in an exhaust gas treatment system such as a washing tower, it is possible to safely reduce the volume of spent ion exchange resin generated at a nuclear power plant without risk of environmental pollution due to radioactivity. The sintered metal filter 17 can be a ceramic filter.
本発明では、上記構成により、従来、多量の水分の蒸発のために大型化していたボール型乾留炉のボール充填部、および、ボール型乾留炉の後段に配置される排ガス処理系の小型化が実現可能となる。更に、脱水液を過熱蒸気として利用する構成により、別途脱水液の専用処理施設を別途設ける必要がなく、前記ボール充填部、および、排ガス処理系の小型化と合わせて、減容処理施設のコンパクト化を実現することができる。具体的には、１０％スラリーイオン交換樹脂（５０wet・kg/h）をボール型乾留炉に供給する場合に比べ、１０wet・kg/hにまで脱水後のイオン交換樹脂をボール型乾留炉に供給することにより、ボールが充填されるボール充填層の高さが１/５にまで金属製の密閉式反応容器１１を小型化することができ、更に、排ガス量も１/２以下に低減することができるため、排ガス処理手段５も小型化することができる。 In the present invention, with the above-described configuration, the ball filling unit of the ball type dry distillation furnace that has been conventionally increased in size for evaporation of a large amount of water and the exhaust gas treatment system disposed downstream of the ball type dry distillation furnace can be downsized. It becomes feasible. In addition, since the dehydrating liquid is used as superheated steam, there is no need to provide a dedicated dehydrating liquid processing facility, and the volume reduction processing facility is compact in combination with the downsizing of the ball filling unit and the exhaust gas processing system. Can be realized. Specifically, compared to the case where 10% slurry ion exchange resin (50 wet · kg / h) is supplied to the ball type dry distillation furnace, the deionized ion exchange resin is supplied to the ball type dry distillation furnace up to 10 wet · kg / h. By doing so, the metal sealed reaction vessel 11 can be downsized to 1/5 the height of the ball packed layer filled with the balls, and the amount of exhaust gas can be reduced to 1/2 or less. Therefore, the exhaust gas treatment means 5 can also be reduced in size.
１ 樹脂受入タンク
２ 脱水機
３ ボール型乾留炉
４ 過熱水蒸気供給手段
５ 排ガス処理手段
６ 樹脂供給ポンプ
７ 脱水液受入れタンク
８ 脱水液供給ポンプ
９ 蒸気発生器
１０ 蒸気過熱器
１１ 金属製の密閉式反応容器
１２ 外部電気式ヒータ
１３ ボール
１４ イオン交換樹脂供給ノズル
１５ 過熱水蒸気供給ノズル
１６ 粉体貯留部
１７ 焼結金属フィルタ
１８ 排ガス出口
DESCRIPTION OF SYMBOLS 1 Resin receiving tank 2 Dehydrator 3 Ball-type dry distillation furnace 4 Superheated steam supply means 5 Exhaust gas treatment means 6 Resin supply pump 7 Dehydrated liquid receiving tank 8 Dehydrated liquid supply pump 9 Steam generator 10 Steam superheater 11 Metal-made sealed reaction Container 12 External electric heater 13 Ball 14 Ion exchange resin supply nozzle 15 Superheated steam supply nozzle 16 Powder reservoir 17 Sintered metal filter 18 Exhaust gas outlet
Claims (3)
該ボール型乾留炉は、金属製の密閉式反応容器と、該容器の下部に配置された粉体貯留部からなり、該密閉式反応容器は、外部加熱手段と、該容器内に充填されたセラミック製または金属製のボールと、該ボールを機械的に撹拌できる撹拌翼と、該容器の上部から該ボール上へ、室温のイオン交換樹脂を供給するイオン交換樹脂供給ノズルと、該容器の上部から該ボール上へ過熱水蒸気を供給する過熱水蒸気供給ノズルを備え、該粉体貯留部は、貯留部内温度を維持する外部電気式ヒータを備え、
該脱水機の後段には、脱水された脱水液を過熱水蒸気化し、該ボール型乾留炉の過熱水蒸気供給ノズルへと供給する過熱水蒸気供給手段を備えることを特徴とするイオン交換樹脂の減容処理システム。 Resin receiving tank for used ion exchange resin, dehydrator for dehydrating a slurry having a high water content stored in the resin receiving tank, a ball-type dry distillation furnace for subjecting the dehydrated slurry to mineralization and volume reduction, and the ball An ion exchange resin volume reduction treatment system comprising an exhaust gas treatment means arranged at the latter stage of a mold-type carbonization furnace,
The ball-type carbonization furnace comprises a metal sealed reaction vessel and a powder reservoir disposed at the lower part of the vessel, and the sealed reaction vessel was filled with external heating means and the vessel. A ceramic or metal ball, a stirring blade capable of mechanically stirring the ball, an ion exchange resin supply nozzle for supplying an ion exchange resin at room temperature from the upper part of the container onto the ball, and an upper part of the container A superheated steam supply nozzle for supplying superheated steam from the ball to the ball, the powder storage unit is provided with an external electric heater for maintaining the temperature in the storage unit,
Subsequent to the dehydrator, the dehydrated dehydrated liquid is superheated with steam, and is provided with superheated steam supply means for supplying it to the superheated steam supply nozzle of the ball-type dry distillation furnace. system.
樹脂受入タンクに貯蔵されたイオン交換樹脂の５〜１５％スラリーを、脱水機での脱水により４０〜６０％スラリーとし、脱水液を過熱水蒸気化した過熱水蒸気および該４０〜６０％スラリーを金属製の密閉式反応容器に供給して、イオン交換樹脂を４００℃以上の過熱水蒸気と接触させる過熱水蒸気接触工程と、該過熱水蒸気接触工程を経たイオン交換樹脂を、更に、４６０℃以上の雰囲気温度下で処理する追加熱処理工程からなることを特徴とするイオン交換樹脂の減容処理方法。 An ion exchange resin volume reduction treatment method using the ion exchange resin volume reduction treatment system according to claim 1,
The 5-15% slurry of the ion exchange resin stored in the resin receiving tank is made into a 40-60% slurry by dehydration in a dehydrator, and the dehydrated liquid is superheated steam and the 40-60% slurry is made of metal. And a superheated steam contact step in which the ion exchange resin is brought into contact with superheated steam at 400 ° C. or higher, and an ion exchange resin that has undergone the superheated steam contact step are further subjected to an atmospheric temperature of 460 ° C. or higher. A method for reducing the volume of an ion exchange resin, comprising an additional heat treatment step.
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