JPH02201194A - Operation of centrifugal clarifier - Google Patents

Operation of centrifugal clarifier

Info

Publication number
JPH02201194A
JPH02201194A JP1017540A JP1754089A JPH02201194A JP H02201194 A JPH02201194 A JP H02201194A JP 1017540 A JP1017540 A JP 1017540A JP 1754089 A JP1754089 A JP 1754089A JP H02201194 A JPH02201194 A JP H02201194A
Authority
JP
Japan
Prior art keywords
rotating body
speed
sludge
weight
centrifugal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP1017540A
Other languages
Japanese (ja)
Other versions
JP2637218B2 (en
Inventor
Seiji Sakamoto
坂本　清次
Kenji Hata
畑　健司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP1754089A priority Critical patent/JP2637218B2/en
Publication of JPH02201194A publication Critical patent/JPH02201194A/en
Application granted granted Critical
Publication of JP2637218B2 publication Critical patent/JP2637218B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors
    • 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

Landscapes

  • Centrifugal Separators (AREA)

Abstract

PURPOSE:To measure the weight of sludge in a short time by stopping driving of a motor during the clarifying operation of a rotating body to freely reduce the speed of the rotating body up to 5% of its rated revolving speed and measuring the required time for the reducing speed. CONSTITUTION:When rotative driving is stopped during the clarifying operation, the speed of a rotating body 6 is reduced in accordance with a formula I. In this case, a mechanical loss torque can be measured before installation of a centrifugal clarifier because being a device characteristic. The moment of inertia is proportional to the weight including gathered sludge because of the same rotating body shape. Thus, the deceleration time to a certain revolving speed is measured to estimate the weight of the rotating body and gathered sludge.

Description

【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明はたとえば核燃料再処理における遠心清澄機の運
転方法に関する。DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of operating a centrifugal clarifier, for example in nuclear fuel reprocessing.

（従来の技術） 使用済燃料の再処理施設においては使用済燃料を解体、
切断後、硝酸を用いて溶解する。この場合、少量の有用
核種、特にウラン、プルトニウム。(Conventional technology) At spent fuel reprocessing facilities, spent fuel is dismantled,
After cutting, dissolve using nitric acid. In this case, small amounts of useful nuclides, especially uranium, plutonium.

核分裂生成物の一部およびジルカロイ燃料被覆管の切屑
が不溶性の残渣（スラッジ）として残る。Some of the fission products and chips of the Zircaloy fuel cladding remain as an insoluble residue (sludge).

ウランとプルトニウムを有機溶媒で抽出する前にあらか
じめこの微粒子状のスラッジを除去しておく必要がある
。このスラッジを固液分離するための清澄工程に遠心清
澄機が開発されている。遠心清澄機はスラッジと溶解液
との比重の差によって遠心分離を行うもので、スラッジ
の捕集、洗浄。This particulate sludge must be removed before uranium and plutonium can be extracted with an organic solvent. A centrifugal clarifier has been developed for the clarification process to separate solid and liquid from this sludge. Centrifugal clarifiers perform centrifugal separation based on the difference in specific gravity between sludge and solution, and collect and wash sludge.

排出が遠隔操作で容易に行なえる利点がある。この遠心
清澄機の構成を第２図を参照しながら説明する。It has the advantage that it can be easily discharged by remote control. The configuration of this centrifugal clarifier will be explained with reference to FIG.

第２図中、符号１はコンクリート製じゃへい壁を示して
おり、このしやへい壁１の上部には架台２を介して駆動
機構のモータ３が載置されている。In FIG. 2, reference numeral 1 indicates a concrete barrier wall, and a motor 3 of a drive mechanism is mounted on the top of the barrier wall 1 via a frame 2.

モータ３にはカップリング４を介して回転軸５が接続さ
れている。この回転軸５の下端はしやへい壁１を貫通し
、しやへい壁１の下部に設置された回転体６の上部端板
７に接続している。回転体６の下端には開口８を有する
下部端板９が接続されている。回転体６内には給液ノズ
ル１０および清浄ノズル１１が挿入されている。A rotating shaft 5 is connected to the motor 3 via a coupling 4. The lower end of this rotating shaft 5 passes through the shield wall 1 and is connected to an upper end plate 7 of a rotating body 6 installed at the lower part of the shield wall 1. A lower end plate 9 having an opening 8 is connected to the lower end of the rotating body 6 . A liquid supply nozzle 10 and a cleaning nozzle 11 are inserted into the rotating body 6.

回転体６の外周囲はケーシング１３で包囲されており、
ケーシング１３の上部外倒面に環状受は容器１・１が設
けられている。受は容器１４の上部内面には前記’／ｎ
澄液排出孔１２から流出した清澄液が上方へ飛散しない
で受は容器１４内に落下するように案内状１５が設けら
れている。ケーシング１３の下方は円錐状に形成され、
下端に不溶解残渣排出管１Ｇが接続されている。回転体
６の振動は軸受１７で抑制されでいる。The outer periphery of the rotating body 6 is surrounded by a casing 13,
An annular container 1 is provided on the upper outer surface of the casing 13. The receiver has the above-mentioned '/n on the inner surface of the upper part of the container 14.
A guide 15 is provided so that the clear liquid flowing out from the clear liquid discharge hole 12 falls into the container 14 without scattering upward. The lower part of the casing 13 is formed into a conical shape,
An undissolved residue discharge pipe 1G is connected to the lower end. The vibrations of the rotating body 6 are suppressed by the bearing 17.

遠心清澄機の通常運転は分析（不溶解残渣濃度等）の終
了した溶解液を定格回転数に保持した回転体６に給液ノ
ズル１０から供給する。？Ｒ澄液は清澄液出口管１８か
ら連続的に排出され、不溶解残渣は下部＠抜９上にスラ
ッジとして捕集される。このスラッジは強い放射能を有
するため、従来その捕集量の測定は間接算出されており
、分析値の濃度と運転時間からの算出もその一つである
。In normal operation of the centrifugal clarifier, the dissolved solution after analysis (insoluble residue concentration, etc.) is supplied from the liquid supply nozzle 10 to the rotating body 6 maintained at the rated rotation speed. ? The R clear liquid is continuously discharged from the clear liquid outlet pipe 18, and the undissolved residue is collected as sludge on the bottom @drawer 9. Since this sludge has strong radioactivity, the amount of collected sludge has conventionally been calculated indirectly, including calculation from the concentration of analytical values and operating time.

（発明が解決しようとする課題） このような構造の遠心清澄機では捕集され堆積したスラ
ッジ量を処理液のスラッジ１度と回転体の分離室の容積
および運転時間から推定している。(Problems to be Solved by the Invention) In a centrifugal clarifier having such a structure, the amount of collected and deposited sludge is estimated from the amount of sludge in the treated liquid, the volume of the separation chamber of the rotating body, and the operating time.

この方法では濃度測定後の液体移送経路において、スラ
ッジの堆積があった場合など実際の回転体内のスラッジ
堆積量と一致しない課題があった。間接的なものとして
回転軸の回転変位を回転体重量と対応させる方法（たと
えば特開昭５７−７５１６４号公ｔｄ９および分離した
スラッジ中の放射性核種（１０＆Ｒｕ）のγ線■ツ定に
よる回転体内スラッジ重量の推定（たとえば特開昭５９
−１９５１９＝１号公報）が知られている。This method has a problem in that it does not match the actual amount of sludge deposited inside the rotating body, such as when sludge is deposited on the liquid transfer path after concentration measurement. As an indirect method, the rotational displacement of the rotating shaft corresponds to the weight of the rotating shaft (for example, JP-A-57-75164 TD9 and sludge inside the rotating body by gamma ray determination of radionuclides (10 & Ru) in the separated sludge. Estimation of weight (for example, JP-A-59
-19519 = Publication No. 1) is known.

遠心清澄機は放射線環境下に設置されるため。Because centrifugal clarifiers are installed in a radiation environment.

計測機器類は保守容易化の観点から個数低減が望まれる
。また、遠心清澄機は通常連続運転を行うので、スラッ
ジ重量のｌ定は必要時に短時間で行なえるものが望まれ
ている。It is desirable to reduce the number of measuring instruments from the viewpoint of ease of maintenance. Furthermore, since centrifugal clarifiers usually operate continuously, it is desired that the sludge weight can be determined in a short time when necessary.

本発明は上記課題を解決するためになされたもので１回
転体内のスラッジ重量を簡易に」ワ定し運転状況の把握
が可能な遠心清澄機を提供することにある。The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a centrifugal clarifier that can easily determine the weight of sludge in one rotating body and grasp the operating status.

〔発明の構成〕[Structure of the invention]

（課題を解決するための手段） 本発明はモータから回転体が吊り下げられてなる遠心／
ｌ！！澄機の運転方法において、前記回転体の清澄運転
中に前記モータの駆動を停止して前記回転体の定格回転
数の５％以内まで自由時速させ、ぞの時速時間を測定し
て前記回転体内に捕集されたスラッジの捕集量を算出し
、前記回転体の時速後は定格回転数に戻して運転するこ
とを特徴とする。(Means for Solving the Problems) The present invention provides a centrifugal motor in which a rotating body is suspended from a motor.
l! ! In the method of operating a clearing machine, the driving of the motor is stopped during clearing operation of the rotating body, the speed is allowed to freely reach within 5% of the rated rotation speed of the rotating body, and the speed per hour is measured. The amount of collected sludge is calculated, and after the rotation speed of the rotating body has increased, the rotation speed is returned to the rated speed and the rotation speed is returned to the rated speed.

（作　用） 清澄運転から回転駆動を停止すると１回転体は次式にし
たがい時速する。(Function) When the rotational drive is stopped from clarification operation, the rotating body speeds up according to the following formula.

ω　：　角速度　　　（ｒａｄ／５） ＴＬ＝　機械損！−ルク（ｋｇｆ−５２・ｍ）■、：　
乾性モーメント＜ｋｇｆ−ｍ）機械損トルクは機器特性
であるので、遠心清澄機設置前にａｌｌ定することがで
きる。また、乾性モーメントは回転体形状が同一である
ので、捕集スラッジを含めた重量に比例する。よって、
一定回転数までの減速時間を測定すれば回転体＋捕集ス
ラッジの重量を推定することができる。ω: Angular velocity (rad/5) TL= Mechanical loss! - Luk (kgf-52・m)■,:
Drying moment < kgf-m) Mechanical loss torque is a device characteristic, so it can all be determined before installing the centrifugal clarifier. Moreover, since the shape of the rotating body is the same, the drying moment is proportional to the weight including the collected sludge. Therefore,
By measuring the deceleration time to a certain rotation speed, the weight of the rotating body + collected sludge can be estimated.

（実施例） 本発明で使用する遠心清澄機の構造は第２図に示したも
のと同様なので、その説明を省略し、運転方法のみにつ
いて第１図を参照しながら説明する。(Example) Since the structure of the centrifugal clarifier used in the present invention is similar to that shown in FIG. 2, the explanation thereof will be omitted, and only the operating method will be explained with reference to FIG. 1.

すなわち、回転体を定格回転数で運転し、その運転中の
回転体の回転駆動を停止すると、作用の項で説明した前
夫の計算式に従い指数関数的に減速する。That is, when the rotating body is operated at the rated rotational speed and the rotational drive of the rotating body during operation is stopped, the rotational speed of the rotating body is exponentially decelerated according to the calculation formula of the ex-husband explained in the section of the operation.

第１図は回転体の回転数の減速曲線を表す回転数と時間
との相関図で、たて軸は回転数を、よこ軸は時間を示し
ている。FIG. 1 is a correlation diagram between rotation speed and time showing a deceleration curve of the rotation speed of a rotating body, where the vertical axis shows the rotation speed and the horizontal axis shows time.

現在、溶解液中のミクロオーダの不溶性残渣を取り除く
ため、数１０００Ｇの遠心力が必要とされている。　こ
のため、回転数として数１１０００ｒｐが要求されてい
る。スラッジと溶解液との比重差の遠心分離では分離し
得る最小の粒子径、すなわち限界粒径ｄＰは ここで、Σは遠心沈降面積で となる。Currently, a centrifugal force of several 1000 G is required to remove micro-order insoluble residues from a solution. For this reason, a rotation speed of several 11,000 rpm is required. In centrifugation based on the difference in specific gravity between sludge and solution, the minimum particle size that can be separated, that is, the critical particle size dP, is where Σ is the centrifugal sedimentation area.

たとえば定格回転数が数１１０００ｒｐの場合、減速の
測定時間として数１０秒間から数分間になるには定速の
９５％まで自由時速する必要がある。For example, when the rated rotational speed is several 11,000 rpm, it is necessary to freely speed up to 95% of the constant speed in order to measure the deceleration from several tens of seconds to several minutes.

清澄への影響は重大から 抜出し半径 ボウル半径 回転体長さ 回転体回転数 溶解液（処理液）の粘度 処理流量 比重差 であられされる。The impact on Kiyosumi is serious. Extraction radius bowl radius Rotating body length Rotating body rotation speed Viscosity of dissolving solution (processing solution) Processing flow rate Specific gravity difference Hail to you.

遠心沈降面積は回転体の形状が同一（’１１　　’２＋
Ｑ）で、処理量が同一　（μＩＱＩΔＰ）ならば回転体
の回転数にのみ依存し、結局 ｄＰｃＩ：　　ω であり、ミクロンオーダの最小粒子径の５％の増加とな
るが、時間も短いので問題どなるものではない。The centrifugal sedimentation area is the same for the shape of the rotating body ('11'2+
Q), if the processing amount is the same (μIQIΔP), it depends only on the rotation speed of the rotating body, and in the end, dPcI: ω, which is an increase of 5% of the minimum particle diameter on the micron order, but the time is short, so it is not a problem. It's not something to shout about.

本実施例では清澄運転中の一時期にスラッジ捕集量の算
出する手順を示したが、処理液の供給液停止後の捕集量
確認、洗浄運転後、次の清澄運転スタート時に前回と回
転体重量の差のチエツクにも利用することが可能である
。In this example, the procedure for calculating the amount of sludge collected during a period of time during the clarification operation was shown. It can also be used to check weight differences.

〔発明の効果〕〔Effect of the invention〕

本発明によれば以下の効果が得られる。 According to the present invention, the following effects can be obtained.

■　清澄運転中、任意の時期に捕集スラッジ量を確認で
きる。■ The amount of collected sludge can be checked at any time during clarification operation.

■　計測系として新たな機器をエリア内に持ち込まない
ので計測系の簡素化が図れる。■ The measurement system can be simplified because no new equipment is brought into the area.

（３）回転体の定格捕集のチエツク、洗浄効果のチエツ
クが簡易に行え、長期間運転にかかわる場合、清澄機信
頼性向上につながる。(3) It is easy to check the rated collection of the rotating body and the cleaning effect, which improves the reliability of the clarifier when operating for a long period of time.

０）供給液量を一定にしておくことによって溶解液中の
スラッジ濃度の変動のチエツクを行うことができる。0) By keeping the amount of supplied liquid constant, it is possible to check for fluctuations in the sludge concentration in the solution.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の詳細な説明するための回転数の減速曲
線を表す回転数と時間の相関図、第２図は本発明で使用
する遠心清澄機を示す縦断面図である。 １・しやへい壁 ２　・架台 ３・・・モータ ４・・・カップリング ５・・・回転軸 ６・・・回転体 ７・・上部端板 ８・・・開口 ９・・・下部端板 １０・給液ノズル １１・洗浄ノズル １２・・・清澄液排出口 １３・・・ケーシング １４・・・受は容器 １５・・・案内板 １６・・・不溶性残渣排出管 １７・軸受 １８・・・清澄液出口管 （８７３３）代理人弁理士　猪　股　祥　晃（ほか１名
）第 ｆ 呵 箒 図FIG. 1 is a correlation diagram between rotation speed and time showing a rotation speed deceleration curve for explaining the present invention in detail, and FIG. 2 is a longitudinal cross-sectional view showing a centrifugal clarifier used in the present invention. 1.Shiyahei wall 2.Frame 3..Motor 4..Coupling 5..Rotating shaft 6..Rotating body 7..Upper end plate 8..Opening 9..Lower end plate 10, liquid supply nozzle 11, cleaning nozzle 12, clear liquid outlet 13, casing 14, container 15, guide plate 16, insoluble residue discharge pipe 17, bearing 18... Clear liquid outlet pipe (8733) Representative Patent Attorney Yoshiaki Inomata (and 1 other person) No.

Claims (1)

【特許請求の範囲】[Claims] モータから回転体が吊り下げられてなる遠心清澄機の運
転方法において、前記回転体の清澄運転中に前記モータ
の駆動を停止して前記回転体の定格回転数の５％以内ま
で自由降速させ、その降速時間を測定して前記回転体内
に捕集されたスラッジの捕集量を算出し、前記回転体の
降速後は定格回転数に戻して運転することを特徴とする
遠心清澄機の運転方法。In a method of operating a centrifugal clarifier in which a rotating body is suspended from a motor, the drive of the motor is stopped during the clarification operation of the rotating body, and the speed is freely reduced to within 5% of the rated rotation speed of the rotating body. A centrifugal clarifier characterized in that the amount of sludge collected in the rotating body is calculated by measuring the speed-down time, and after the speed of the rotating body is lowered, the rotation speed is returned to the rated speed and the machine is operated. How to drive.
JP1754089A 1989-01-30 1989-01-30 Operation method of centrifugal clarifier Expired - Lifetime JP2637218B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1754089A JP2637218B2 (en) 1989-01-30 1989-01-30 Operation method of centrifugal clarifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1754089A JP2637218B2 (en) 1989-01-30 1989-01-30 Operation method of centrifugal clarifier

Publications (2)

Publication Number Publication Date
JPH02201194A true JPH02201194A (en) 1990-08-09
JP2637218B2 JP2637218B2 (en) 1997-08-06

Family

ID=11946749

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1754089A Expired - Lifetime JP2637218B2 (en) 1989-01-30 1989-01-30 Operation method of centrifugal clarifier

Country Status (1)

Country Link
JP (1) JP2637218B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05164662A (en) * 1991-12-17 1993-06-29 Sumitomo Metal Mining Co Ltd Pulse filter sludge sampling device
JP2014153121A (en) * 2013-02-06 2014-08-25 Toshiba Corp Radioactive waste liquid sedimentation separating device and sedimentation separating method
JP2019155253A (en) * 2018-03-12 2019-09-19 株式会社ゲーテホールディングス Centrifugal separator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05164662A (en) * 1991-12-17 1993-06-29 Sumitomo Metal Mining Co Ltd Pulse filter sludge sampling device
JP2014153121A (en) * 2013-02-06 2014-08-25 Toshiba Corp Radioactive waste liquid sedimentation separating device and sedimentation separating method
JP2019155253A (en) * 2018-03-12 2019-09-19 株式会社ゲーテホールディングス Centrifugal separator

Also Published As

Publication number Publication date
JP2637218B2 (en) 1997-08-06

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