Specifications 

Refining Decanter Centrifugal Separator: 
1.Large Capacity continuous separation 
2.decanter filtration centrifuge 
3.Refining 

Main Equipment--- LWZ Decanter Centrifuge

LWZ decanter centrifuge is one of the main equipments in the dewatering system. With large bowl angle, BD plate and large length-diameter ratio; equipped with the high-torque planetary gearbox or hydraulic driving system, it features high rotating speed, large torque, and small differential speed.

Main Features

Bowl speed: high rotating speed design and high centrifugal force, that effectively remove particles ≥3μm;

Length-diameter ratio: actual effective L/D ratio is higher than 4.1; long drying area maximum the settling time and dewatering time of sludge;

BD plate: A round stop is mounted between the conveyor settlement area and the drying area. The sludge in the settlement area is compressed first and then enters into the drying area, minimum the moisture rate of sludge.

Typical structures of the decanter centrifuge  

Counter-current type After blended liquid flows into drum, the cleaned solution and the cake move conversely in separating, each flowing toward its own outlet. The counter current type is a king of normal one and suitable for most separating situations.

Co-current type After blended liquid flows into drum, the cleaned solution and the cake move in the same direction when separating, after separation, the cleaned solution flows back and is discharged through backfiow connection in order that cake is not washed away by feed liquid when feedng. This rye is more suitable for separation of materials witn Iow concentration and difficult to separate. 

Three phase separstion type After two liquid phases and one solid phase with differential density come in to drum, under a centrifugal force, solid phase settles and the two liuquid phases are stratified, thus liquid-liquid-solid separation is realized. This type is suitable for such a three-phase separation situation as liquid-liquid-solid with differential density.

Auxillary Equipment1---Electric control system

• The control system adopts PLC to control the polymer mixing and dosing device, sludge crushing & cutting machine, sludge feed pump, polymer feed pump, flow meters, etc. And conduct detection, fault alarm, interlocking protection, etc.
• Automatically control of start-up, dewatering, cleaning and shut down of the centrifuge in accordance with the pre-set program.
• Equipped with functions of automatic adjustment of feeding load at constant torque;
• Automatically increase or decrease the differential speed in accordance with the changes in pushing torque so as to prevent solid from being blocked;
• Automatically adjustment of oil volume supplied to the hydraulic driving system in accordance with changes in hydraulic pressure so as to control the differential speed;
• Automatically mixing and dosing of polymer as required;
• Large-size color touch screen displays the real-time parameters of operating conditions.

• Auxillary Equipment 2---Polymer mixing and dosing device

  • Three-chamber polymer dosing device is a type of device for preparing macromolecule flocculant, and it is capable to prepare 1~3‰ PAM flocculant continuously. It is also capable to calculate the weight of supplied powder and flow rate of the water supply. The device can prepare the flocculant continuously and dose certain amount of the polymer into the centrifuge. It is mainly consist of:
  • Automatic dry polymer dosing system
  • Automatic water injection device
  • Level monitoring system
  • Agitators, piping, valves, etc

• Auxillary Equipment 5---Shaft-free screw conveyor

  Model LS Shaft-free screw conveyor mainly consists of drive device, shaft-free screw vane, U-shaped changeable abrasion-resistant scaleboard and frame. It is mainly used for transporting sludge cake from the centrifuge to outdoors sludge heaping field or vehicle. Entire work is done at close state so as to keep environment clean.

    

   Keyword:   Automatic Centrifugal System , dewatering centrifuge & decanter centrifuge