JPH08323240A - Operation method for screw decanter - Google Patents
Operation method for screw decanterInfo
- Publication number
- JPH08323240A JPH08323240A JP7315905A JP31590595A JPH08323240A JP H08323240 A JPH08323240 A JP H08323240A JP 7315905 A JP7315905 A JP 7315905A JP 31590595 A JP31590595 A JP 31590595A JP H08323240 A JPH08323240 A JP H08323240A
- Authority
- JP
- Japan
- Prior art keywords
- centrifuge bowl
- screw
- bowl
- rotational speed
- centrifuge
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
Landscapes
- Centrifugal Separators (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は固液混合物を軽質分
（液体）と重質分（固体）とに分離するための円錐ボウ
ル形のスクリューデカンターの運転方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a conical bowl type screw decanter for separating a solid-liquid mixture into a light component (liquid) and a heavy component (solid).
【０００２】[0002]
【従来の技術】円錐部分を有する円筒ボウル形のスクリ
ューデカンターは公知であり、この遠心分離機では円錐
形の遠心分離ボウル (遠心胴) が縦軸線の周りに回転可
能に支持され、スクリューコンベヤが遠心分離ボウルと
同軸に回転自在に支持されている。さらに、分離される
混合物を遠心分離ボウル中へ供給する装置と、互いに分
離された軽質分および重質分を取り出すための出口とが
設けられている。重質分の出口と遠心分離ボウルの軸線
との間の半径方向距離は遠心分離ボウルの壁体と遠心分
離ボウルの軸線との間の半径方向距離よりも小さい。ス
クリューデカンターの運転時には遠心分離ボウル内部に
遠心力によって液体のリングが形成され、遠心分離ボウ
ルと同じ回転方向に、しかも、遠心分離ボウルとは異な
った回転数で回転する（回転数差のある）スクリューコ
ンベヤによって液体のリングから重質分を押し出し、遠
心分離ボウルの円錐部分の端部出口へ送る。BACKGROUND OF THE INVENTION Cylindrical bowl screw decanters with conical sections are known, in which a conical centrifuge bowl (centrifugal barrel) is rotatably supported about its longitudinal axis and a screw conveyor is used. It is rotatably supported coaxially with the centrifuge bowl. Furthermore, a device is provided for feeding the separated mixture into the centrifuge bowl and an outlet for taking out the light and heavy components separated from each other. The radial distance between the heavies outlet and the centrifuge bowl axis is less than the radial distance between the centrifuge bowl wall and the centrifuge bowl axis. During operation of the screw decanter, a liquid ring is formed inside the centrifuge bowl by the centrifugal force, and it rotates in the same rotation direction as the centrifuge bowl, but at a different rotational speed from the centrifugal bowl (there is a rotational speed difference). The screw conveyor pushes the heavies out of the ring of liquid and delivers them to the end outlet of the conical portion of the centrifuge bowl.
【０００３】このスクリューデカンターでは重質分（固
体）の搬出がスクリューコンベヤと遠心分離ボウルとの
回転数差で行われ、遠心分離ボウルの回転方向に対して
スクリューコンベヤの回転数を進み側（スクリューコン
ベヤの回転数が遠心分離ボウルの回転数より大きい）ま
たは遅れ側（スクリューコンベヤの回転数が遠心分離ボ
ウルの回転数より小さい）に調整することができるよう
になっている。In this screw decanter, the heavy components (solids) are carried out by the difference in the number of revolutions of the screw conveyor and the centrifuge bowl. The rotation speed of the conveyor can be adjusted to the rotation speed of the centrifugation bowl) or to the delay side (the rotation speed of the screw conveyor is lower than the rotation speed of the centrifugation bowl).
【０００４】遠心分離ボウルの回転で生じる遠心力によ
ってスクリューデカンターの内部に形成される液体のリ
ングは主として分離された液体からなる。このリングの
内径は軽質分用排出口の半径方向位置で決まる。重質分
（固体）は液体リングの外側端部すなわち遠心分離ボウ
ルの壁面上に沈降する。遠心分離ボウルの壁面上に沈降
した固形分は遠心分離ボウルと同回転かつ遠心分離ボウ
ルの回転数とは遅れまたは進んで回転されるスクリュー
コンベヤのスクリューによって捕捉されて遠心分離ボウ
ルの狭い方の円錐形端部へ送られる。この端部では固形
物がスクリューコンベヤによって液体リングから遠心力
に逆らって押し出され、そこから固形物出口へ送られ
る。軽質分（液体）はスクリューコンベヤのスクリュー
によって形成される通路を通り、少なくとも一部はスク
リューコンベヤの搬送方向に逆行して遠心分離ボウルの
反対側端部へ流れ、そこに設けられた出口から流出す
る。The ring of liquid formed inside the screw decanter by the centrifugal force generated by the rotation of the centrifuge bowl consists mainly of separated liquid. The inner diameter of this ring is determined by the radial position of the light component discharge port. The heavies (solids) settle on the outer end of the liquid ring, the wall of the centrifuge bowl. The solid content that settles on the wall of the centrifuge bowl is captured by the screw of the screw conveyor that is rotated at the same speed as the centrifuge bowl, but with or after the rotation speed of the centrifuge bowl. The shape is sent to the end. At this end, the solids are pushed out of the liquid ring against the centrifugal force by the screw conveyor and from there to the solids outlet. The light component (liquid) passes through the passage formed by the screw of the screw conveyor, and at least part of it goes backward in the conveying direction of the screw conveyor and flows to the opposite end of the centrifuge bowl, and flows out from the outlet provided there. To do.
【０００５】スクリューデカンターの運転を止めると、
遠心分離ボウルの回転数が低下し、それと共に遠心力も
減少し、やがては停止する。この遠心分離ボウルの停止
時に遠心力が重力より低くなる回転数に達すると、遠心
分離ボウル内部に形成されていた液体リングが崩壊す
る。その結果、遠心分離ボウル内部の液体が重質分出口
から、例え短時間にせ、どっと溢れてしまう。When the operation of the screw decanter is stopped,
The rotation speed of the centrifuge bowl decreases, the centrifugal force also decreases with it, and the centrifugal bowl eventually stops. When the centrifugal force reaches a rotational speed at which the centrifugal force becomes lower than gravity when the centrifuge bowl is stopped, the liquid ring formed inside the centrifuge bowl collapses. As a result, the liquid inside the centrifuge bowl overflows from the heavy component outlet for a short time, for example.
【０００６】先願のドイツ特許第 4321964号では、遠心
分離ボウルの回転数および／またはスクリューコンベヤ
の回転数を短時間、急激に変化させて液体リングがその
慣性で回転数の変化に追従しないようにし、スクリュー
間の液体の慣性質量によって急激な回転数変化と共に軽
質分を軽質分出口へ送るようにしている。No. 4,321,964 of the earlier application, the rotation speed of the centrifuge bowl and / or the rotation speed of the screw conveyor is rapidly changed for a short time so that the liquid ring does not follow the rotation speed change due to its inertia. In addition, the light component is sent to the light component outlet along with a rapid change in the rotation speed due to the inertial mass of the liquid between the screws.
【０００７】遠心分離ボウルの回転数が低下した時の他
の欠点は、液体リングが崩壊する前の低臨界回転数時に
生じる。すなわち、遠心分離ボウルに対してスクリュー
コンベヤを同方向に相対回転運動させることによって、
スクリューコンベヤは遠心分離ボウルの壁面上に堆積し
た重質分を捕捉し、遠心力に逆らって軸線方向へ内側に
押しながら円錐ボウルの端部の出口へ送る。こうして重
質分を分離した液体の外側で遠心分離ボウル円錐部を経
て送る際にも重質分から軽質分が引き続き分離される。
回転数が低下して遠心力が低下すると、重質分の「上向
き」方向への送りはさらに容易になり、従って、脱水度
が悪化する。Another disadvantage of reduced centrifuge bowl speeds occurs at low critical speeds before the liquid ring collapses. That is, by relatively rotating the screw conveyor in the same direction with respect to the centrifuge bowl,
The screw conveyor captures the heavies deposited on the walls of the centrifuge bowl and pushes them axially inward against centrifugal forces and sends them to the outlet at the end of the conical bowl. The light fraction is subsequently separated from the heavy fraction when it is sent outside the liquid from which the heavy fraction has been separated through the conical portion of the centrifuge bowl.
Lower rotation speeds and lower centrifugal forces make it easier to feed heavier "up" directions, and thus worse dehydration.
【０００８】運転を止る操作の途中で混合物を供給を止
めた時には、スクリューコンベヤが遠心分離ボウルの内
部に蓄積していた固形物の材料から脱水固形物を排出す
る作業を続けて目標回転数で排出が完全に停止する。し
かし、運転停止操作の途中で遠心分離ボウルの回転数が
低下した場合には、混合物の供給が止まったにもかかわ
らず、スクリューデカンターは再び固形分の排出を続け
る。しかし、遠心力が小さいため固形分の脱水度は所望
値ではなくなり、一部が「塊」状になって排出させれ
る。固形物の一分が残っているスクリューデカンターを
再始動する時にも低遠心力領域を通過するため、この場
合にもこの水分が多い重質分が排出される。When the supply of the mixture is stopped during the operation of stopping the operation, the screw conveyor continues the work of discharging the dehydrated solid matter from the solid matter accumulated in the centrifuge bowl, and the target rotation speed is kept. Ejection stops completely. However, when the rotation speed of the centrifuge bowl is lowered during the shutdown operation, the screw decanter continues to discharge the solid content again, even though the supply of the mixture is stopped. However, since the centrifugal force is small, the dehydration degree of the solid content is not a desired value, and a part of the solid content is discharged as a “lump”. Even when the screw decanter in which a part of the solid matter remains is restarted, it passes through the low centrifugal force region, and in this case also, the heavy component having a large amount of water is discharged.
【０００９】スクリューデカンターの運転中止時および
再始動時に脱水不良な重質分が排出されることは、全体
の分離効率を悪くするだけでなく、分離された重質分の
後処理で移送・乾燥・焼却装置に粘着する等の問題を生
じる。The discharge of heavy components that are not dehydrated when the screw decanter is stopped and restarted not only deteriorates the overall separation efficiency, but also transports and dries the separated heavy components by post-treatment.・ Produces problems such as sticking to incinerators.
【００１０】[0010]
【発明が解決しようとする課題】本発明の課題はスクリ
ューデカンターの運転停止時またはは再始動時の上記欠
点を無くしたスクリューデカンターの運転方法を提供す
ることである。SUMMARY OF THE INVENTION An object of the present invention is to provide a method of operating a screw decanter which eliminates the above-mentioned drawbacks when the screw decanter is stopped or restarted.
【００１１】[0011]
【課題を解決するための手段】本発明は縦軸線の周りに
回転自在に支持された円錐部分を有する円筒形の遠心分
離ボウルと、この遠心分離ボウルの壁体によって取囲ま
れた状態で遠心分離ボウルと同軸に配置された支持され
た回転自在なスクリューコンベヤと、分離すべき混合物
を遠心分離ボウル中へ供給する手段と、互いに分離され
た軽質分と重質分を取出すための出口とを有し、重質分
を取出すための出口と遠心分離ボウルの縦軸線との間の
半径方向距離は遠心分離ボウル壁体と遠心分離ボウルの
縦軸線との間の半径方向距離より小さく、運転時にはス
クリューデカンターは遠心分離ボウルと同じ回転方向に
且つ回転数差が生じるように異なる回転数で回転して遠
心分離ボウルの内部に遠心力によって形成された液体リ
ングから重質分を円錐部分の端部出口へ向かって移送す
るようになっている固液混合物を軽質分（液体）と重質
分（固体）とに分離するためのスクリューデカンターの
運転方法において、スクリューデカンターの停止時には
遠心分離機への動力の供給を遮断した後に、スクリュー
コンベヤの回転数を遠心分離ボウルの回転数とほぼ同じ
にして回転数差をほぼゼロとし、それによって遠心分離
ボウルの最小回転数以下では重質分が移送されないよう
にし、スクリューデカンターの再始動時には、先ずスク
リューコンベヤの回転数と遠心分離ボウルの回転数とを
等しくして回転数差をほぼゼロにし、次いで、遠心分離
ボウルの最小回転数に到達した時にスクリューコンベヤ
の回転数を使用回転数にすることによって目標回転数差
を生じるようにしたことを特徴とする方法を提供する。SUMMARY OF THE INVENTION The present invention is a cylindrical centrifuge bowl having a conical portion rotatably supported about a longitudinal axis, and a centrifuge surrounded by the walls of the centrifuge bowl. A supported rotatable screw conveyor arranged coaxially with the separation bowl, means for feeding the mixture to be separated into the centrifuge bowl, and an outlet for removing the light and heavy components separated from each other. And the radial distance between the outlet for removing heavy components and the longitudinal axis of the centrifuge bowl is smaller than the radial distance between the centrifuge bowl wall and the longitudinal axis of the centrifuge bowl, The screw decanter rotates in the same rotation direction as the centrifuge bowl and at different rotation speeds so that there is a difference in the number of rotations, and removes heavy components from the liquid ring formed by the centrifugal force inside the centrifuge bowl. In the operation method of the screw decanter for separating the solid-liquid mixture into the light component (liquid) and the heavy component (solid), which is designed to be transferred toward the outlet at the end of the conical portion, when the screw decanter is stopped. After the power supply to the centrifuge is cut off, the screw conveyor speed is made to be almost the same as that of the centrifuge bowl, and the speed difference is almost zero, so that the rotation speed of the centrifuge bowl is below the minimum speed. When the screw decanter is restarted, the rotation speed of the screw conveyor and the rotation speed of the centrifuge bowl are made equal so that the rotation speed difference becomes almost zero, and then the minimum rotation speed of the centrifuge bowl. When the target rotation speed is reached, the target rotation speed difference is generated by changing the rotation speed of the screw conveyor to the used rotation speed. To provide a method.
【００１２】[0012]
【発明の実施の形態】本発明では、運転始動時および停
止操作時に遠心分離ボウルが通過しなければならない使
用回転数よりも低い回転数（低い遠心力）の段階では、
遠心分離ボウルの最小回転数以下になった時にスクリュ
ーコンベヤの回転数を遠心分離ボウルの回転数に合せ
て、回転数差がほぼゼロにする。その結果、この運転段
階の初期には比較的少量の固形分が排出されるが、その
後は固形分はもはや全く排出されなくなる。回転数差を
遠心力に正しく適応させることによって、低回転数で排
出される固形物の濃度すなわち脱水度をスクリューデカ
ンターの通常運転時に排出される固形分の濃度にするこ
とができる。従って、例えば湿った固形分が排出される
という問題はなくなる。BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, at the stage of the rotational speed lower than the used rotational speed (low centrifugal force) that the centrifugal separation bowl has to pass at the time of starting and stopping the operation,
When the number of revolutions of the centrifuge bowl becomes less than the minimum number of revolutions, the number of revolutions of the screw conveyor is adjusted to the number of revolutions of the centrifuge bowl so that the difference in number of revolutions becomes almost zero. As a result, a relatively small amount of solids is discharged at the beginning of this operating stage, but no solids are discharged at all thereafter. By properly adapting the rotational speed difference to the centrifugal force, the concentration of solids discharged at a low rotational speed, that is, the degree of dehydration can be made the concentration of solids discharged during normal operation of the screw decanter. Thus, for example, the problem of discharging damp solids is eliminated.
【００１３】遠心分離ボウルとスクリューコンベヤとを
別個の油圧駆動装置で回転する油圧駆動式スクリューデ
カンターの場合には、運転始動時および進展停止時にス
クリューコンベヤの回転数を遠心分離ボウルの回転数に
合せる操作をスクリューコンベヤの駆動装置の制御で簡
単に行うことができる。この油圧駆動装置の場合には残
っている固形物を遠心分離ボウルから排出する際に、ス
クリューコンベヤの油圧駆動装置が温度上昇しないよう
にするために、スクリューコンベヤの駆動装置の冷却の
ためにその一分に油の循環を維持する必要がある。In the case of a hydraulically driven screw decanter in which the centrifuge bowl and the screw conveyor are rotated by separate hydraulic drive devices, the rotational speed of the screw conveyor is adjusted to the rotational speed of the centrifuge bowl at the start of operation and at the time of stop of progress. The operation can be easily performed by controlling the driving device of the screw conveyor. In the case of this hydraulic drive, in order to prevent the hydraulic drive of the screw conveyor from rising in temperature when the remaining solids are discharged from the centrifuge bowl, the cooling of the drive of the screw conveyor It is necessary to maintain oil circulation every minute.
【００１４】[0014]
【実施例】以下、本発明の上記およびその他の特徴およ
び詳細をスクリューデカンターの運転状態の一例を示す
添付の概念図を用いて説明する。The above and other features and details of the present invention will be described below with reference to the accompanying conceptual drawings showing an example of the operating state of a screw decanter.
【００１５】図１は遠心分離ボウルの回転数ｎと時間Ｚ
との関係を示している。運転始動段階(14)（スタート点
Z0から時間Z2まで）では、遠心分離ボウルの回転数(11)
はほぼ直線的に使用回転数(10)まで連続的に上昇する。
この使用回転数(10)はスクリューデカンターの正常運転
期間(15)（時点Z2からZ3まで）の全区間の間一定に維持
される。時点Z3でスクリューデカンターの運転が遮断さ
れと、その後の停止段階(16)（時点Z3からZ5まで）では
遠心分離ボウルの回転数(12)は正常運転時の使用回転数
(10)から連続的に低下し、最後には時点Z5で遠心分離ボ
ウルは完全に静止する。FIG. 1 shows the rotation speed n of the centrifuge bowl and the time Z.
Shows the relationship with. Operation start stage (14) (Start point
From Z 0 to time Z 2 ) the centrifuge bowl speed (11)
Increases almost linearly up to the operating speed (10).
This rotational speed (10) is maintained constant during the entire period of normal operation (15) of the screw decanter (time points Z 2 to Z 3 ). When the operation of the screw decanter is blocked at Z 3, the rotation speed of the subsequent stop step (16) (from the time Z 3 to Z 5) in centrifuge bowl (12) rotational speed used during normal operation
It drops continuously from (10) and finally at time point Z 5 the centrifuge bowl is completely stationary.
【００１６】本発明では、固形物の一部がまだ残ってい
る状態のスクリューデカンターの再始動時（最初の始動
時ではない）に、時点Z1で最小回転数(13)に到達した時
に、ゼロから出発してスクリューデカンターの正常運転
に必要な回転数差(17)となるように遠心分離ボウルの回
転数に対するスクリューコンベヤの回転数を変える。分
離された固形物はここで排出される。この回転数差(17)
は時点Z3でスクリューデカンターの運転が停止された後
も維持される。しかし、遠心分離ボウルの回転数が時点
Z4で最小回転数(13)まで低下すると、例えばスクリュー
コンベヤの駆動装置への油圧を遮断することによってス
クリューコンベヤの回転数を遠心分離ボウルの回転数に
合せる調整を行う。それによって今度はスクリューコン
ベヤは遠心分離ボウルの回転数でそれと一緒に回転す
る。従って、回転数差がゼロになって固形分の排出は止
まる。According to the present invention, when the screw decanter is restarted (apart from the first start) when a part of the solid matter still remains, when the minimum rotation speed (13) is reached at time Z 1 , Starting from zero, the screw conveyor rpm is varied relative to the centrifuge bowl rpm so that there is a rotational speed difference (17) required for normal operation of the screw decanter. The separated solid matter is discharged here. This speed difference (17)
Is maintained after the screw decanter has been shut down at time Z 3 . However, when the rotation speed of the centrifuge bowl is
When the rotation speed decreases to the minimum rotation speed (13) at Z 4 , the rotation speed of the screw conveyor is adjusted to match the rotation speed of the centrifuge bowl by, for example, shutting off the hydraulic pressure to the driving device of the screw conveyor. This in turn causes the screw conveyor to rotate with it at the rpm of the centrifuge bowl. Therefore, the difference in the number of rotations becomes zero, and the discharge of the solid content stops.
【００１７】例えば、始動時および遮断時の間に一分の
部品の冷却および潤滑を保証するために、ボウル回転数
に対するスクリューの回転数差を数秒間の短時間だけ生
じさせ、再び無くすこともできる。この場合には脱水不
十分な固形分が円錐部分から排出されることはない。For example, in order to guarantee cooling and lubrication of one minute of the parts during start-up and shut-down, the screw speed difference with respect to the bowl speed can be produced for a short time of a few seconds and then eliminated again. In this case, insufficiently dehydrated solids will not be discharged from the conical portion.
【図１】スクリューデカンターの運転状態の概念図。FIG. 1 is a conceptual diagram of an operating state of a screw decanter.
10 使用回転数 11 運転始動
時のボウル回転数 12 運転停止時のボウル回転数 13 最小回転
数 14 運転始動段階 15 正常運転
段階 16 運転停止段階 17 正常運転
に必要な回転数差 ｎ 回転数 Ｚ 時間10 Operating speed 11 Bowl speed at starting operation 12 Bowl speed at stopping operation 13 Minimum speed 14 Starting step 15 Normal operation step 16 Stopping step 17 Difference in speed required for normal operation n Speed Z time
Claims (5)
錐部分を有する円筒形の遠心分離ボウルと、この遠心分
離ボウルの壁体によって取囲まれた状態で遠心分離ボウ
ルと同軸に配置された支持された回転自在なスクリュー
コンベヤと、分離すべき混合物を遠心分離ボウル中へ供
給する手段と、互いに分離された軽質分と重質分を取出
すための出口とを有し、重質分を取出すための出口と遠
心分離ボウルの縦軸線との間の半径方向距離は遠心分離
ボウル壁体と遠心分離ボウルの縦軸線との間の半径方向
距離より小さく、運転時にはスクリューデカンターは遠
心分離ボウルと同じ回転方向に且つ回転数差が生じるよ
うに異なる回転数で回転して遠心分離ボウルの内部に遠
心力によって形成された液体リングから重質分を円錐部
分の端部出口へ向かって移送するようになっている固液
混合物を軽質分（液体）と重質分（固体）とに分離する
ためのスクリューデカンターの運転方法において、 スクリューデカンターの停止時には、遠心分離機への動
力の供給を遮断した後に、スクリューコンベヤの回転数
を遠心分離ボウルの回転数とほぼ同じにして、回転数差
をほぼゼロとし、それによって遠心分離ボウルの最小回
転数以下では重質分が移送されないようにし、 スクリューデカンターの再始動時には、先ずスクリュー
コンベヤの回転数と遠心分離ボウルの回転数とを等しく
して回転数差をほぼゼロにし、次いで、遠心分離ボウル
の最小回転数に到達した時にスクリューコンベヤの回転
数を使用回転数にすることによって目標回転数差を生じ
るようにしたことを特徴とする方法。1. A cylindrical centrifuge bowl having a conical portion rotatably supported about a longitudinal axis, and arranged coaxially with the centrifuge bowl surrounded by a wall of the centrifuge bowl. A supported rotatable screw conveyor, means for feeding the mixture to be separated into the centrifuge bowl, and an outlet for removing the light and heavy components separated from each other. The radial distance between the outlet for withdrawal and the longitudinal axis of the centrifuge bowl is smaller than the radial distance between the centrifuge bowl wall and the longitudinal axis of the centrifuge bowl, and during operation the screw decanter is From the liquid ring formed by the centrifugal force in the centrifuge bowl, rotating in the same rotational direction and at different rotational speeds so as to generate a rotational speed difference, the heavy components are directed to the end outlet of the conical portion. In a method of operating a screw decanter for separating a solid-liquid mixture into a light component (liquid) and a heavy component (solid), the power to the centrifuge is stopped when the screw decanter is stopped. After shutting off the supply, the screw conveyor speed is made to be almost the same as that of the centrifuge bowl, and the speed difference is almost zero, so that the heavy component is not transferred below the minimum speed of the centrifuge bowl. When restarting the screw decanter, first make the number of revolutions of the screw conveyor equal to the number of revolutions of the centrifuge bowl to make the number of revolutions almost zero, and then when the minimum number of revolutions of the centrifuge bowl is reached. A method in which a target rotational speed difference is generated by changing the rotational speed of the conveyor to the operating rotational speed.
合には、スクリューコンベヤの回転数を遠心分離ボウル
の回転数に合せた時間の間はスクリューコンベヤの駆動
装置を冷却するために油の循環を部分的に維持する請求
項１に記載の方法。2. In the case of a hydraulically driven screw decanter, the oil circulation is partly cooled to cool the screw conveyor drive during a time period in which the rotational speed of the screw conveyor is matched with the rotational speed of the centrifuge bowl. The method of claim 1, wherein the method is maintained for a long time.
転数差を予めプログラムされた関数に従ってボウル回転
数に応じて増加する請求項１に記載の方法。3. The method according to claim 1, wherein upon restart of the screw decanter, the rotational speed difference is increased as a function of the bowl rotational speed according to a preprogrammed function.
時に、回転数差を所定関数に従ってボウル回転数に応じ
て連続的または急激に変化させる請求項１に記載の方
法。4. The method according to claim 1, wherein when the operation of the screw decanter is stopped, the rotation speed difference is continuously or rapidly changed according to the bowl rotation speed according to a predetermined function.
リューの回転数差がゼロとし、数秒間のごく短時間に最
終値にする請求項１に記載の方法。5. The method according to claim 1, wherein the difference in the number of revolutions of the screw is set to be zero or less at the minimum number of revolutions of the centrifuge bowl, and the final value is reached in a very short time of several seconds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4439938.3 | 1994-11-09 | ||
| DE4439938A DE4439938A1 (en) | 1994-11-09 | 1994-11-09 | Process for operating screw centrifuges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08323240A true JPH08323240A (en) | 1996-12-10 |
Family
ID=6532826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7315905A Withdrawn JPH08323240A (en) | 1994-11-09 | 1995-11-09 | Operation method for screw decanter |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0711607B1 (en) |
| JP (1) | JPH08323240A (en) |
| AT (1) | ATE194507T1 (en) |
| DE (2) | DE4439938A1 (en) |
| ES (1) | ES2151574T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015073951A (en) * | 2013-10-09 | 2015-04-20 | 神鋼環境メンテナンス株式会社 | Method for operating organic waste water treatment plant |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3494542A (en) * | 1968-05-27 | 1970-02-10 | Pennwalt Corp | Centrifuging process and apparatus |
| DE2551788A1 (en) * | 1975-11-18 | 1977-06-02 | Flottweg Werk Bruckmayer | FULLY-SLEEVED SCREW CENTRIFUGE WITH DIFFERENTIAL SPEED-VARIABLE COUPLING BETWEEN SHEATH PART AND SCREW PART |
| US4978331A (en) * | 1989-07-11 | 1990-12-18 | Alfa-Laval Ab | Method and apparatus for cleaning in place of a decanter centrifuge |
| DE4321964A1 (en) | 1993-07-01 | 1995-01-12 | Kloeckner Humboldt Deutz Ag | Process for operating screw centrifuges |
-
1994
- 1994-11-09 DE DE4439938A patent/DE4439938A1/en not_active Withdrawn
-
1995
- 1995-10-26 ES ES95116855T patent/ES2151574T3/en not_active Expired - Lifetime
- 1995-10-26 AT AT95116855T patent/ATE194507T1/en not_active IP Right Cessation
- 1995-10-26 DE DE59508557T patent/DE59508557D1/en not_active Expired - Fee Related
- 1995-10-26 EP EP95116855A patent/EP0711607B1/en not_active Expired - Lifetime
- 1995-11-09 JP JP7315905A patent/JPH08323240A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015073951A (en) * | 2013-10-09 | 2015-04-20 | 神鋼環境メンテナンス株式会社 | Method for operating organic waste water treatment plant |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4439938A1 (en) | 1996-05-15 |
| DE59508557D1 (en) | 2000-08-17 |
| EP0711607A1 (en) | 1996-05-15 |
| ATE194507T1 (en) | 2000-07-15 |
| ES2151574T3 (en) | 2001-01-01 |
| EP0711607B1 (en) | 2000-07-12 |
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