Operating principle
Separation technique of(LW)T series fluid pressurization horizontal solid-bowl scroll-discharge decanter centrifuge:Based on the theory of pre-acceleration separation technology,utilitize rotating kinetic energy convert air negative pressure and fluid pressure into separating energy,reduce feeding resistance and speed up cone point discharge rate.
Gyroscopic-effect design on rotators ensure stability of equipment and stability of fluid matter's running quality within bowl cavity,to increase productivity in unit time. Twice separation structure makes a stable pressure of discharging fluid,and fluid is discharged in reverse direction to tangential line,meanwhile pressurized fluid supplies rotating power to bowl,saves part of energy.
Fluid pressurization separation technique has got following achievements:cylinder of smaller diameter,larger processing capacity,smooth feeding,faster separation,rapid residue discharge
assisted by fluid pressure,no accumulation of residue within cylinder body,drier residue,smaller equipment abrasion,fluid pressure defoaming  and lower solid containing rate of clear liquid after separation. This technique could effectively solves following technical defects of existing types of centrifuge:small processing capacity,incomplete separation,hard discharge,material blockage within cylinder body and severe abrasion of assembly parts.

Brief introduction


Horizontal spiral decanter centrifuges can generally be divided into horizontal spiral filtration centrifuges and horizontal spiral settling centrifuges. Horizontal screw centrifuge is a settling equipment with horizontal spiral discharge and continuous operation

1、 Characteristics of LW900 × 3600NYD-1 horizontal spiral discharge settling centrifuge
1. Wide applicability
A suspension with a solid phase weight of 2:510%, a liquid-solid volume concentration of zG50%, and a liquid-solid density difference of 30.05 μ m and a cloud diameter of 55m can be used for separation, dehydration, purification, and classification. When the density difference between the solid and liquid phases is large, the solid phase position can also be separated with a diameter of 325m.
2. High degree of automation
Can achieve continuous feeding and discharging. Under the action of centrifugal force, the solid phase calibrator is continuously pushed towards the small end of the drum by the spiral, and the clear liquid phase is discharged from the large end of the flow outlet along the spiral Thus achieving continuous automatic operation.
3. Easy to adjust
Adopting advanced frequency converters, it has the advantages of low energy consumption and stepless adjustable working speed. The diameter and differential speed of the diffuser plate can be adjusted appropriately according to the material properties. The machine is equipped with an advanced hydraulic differential system, which has a large output torque, automatic differential feedback adjustment, and automatic compensation for pushing power. Automatically restore to initial state after eliminating overload, less likely to cause material blockage.

The horizontal spiral decanter centrifuge is mainly used for solid-liquid separation processing in production and pollution control of production wastewater, and is applied in wastewater treatment in fields such as steel rolling mills, coal washing and mineral processing, papermaking and leather making. Different processing objects definitely have different requirements for machine performance parameters, so it is necessary for the equipment to be able to achieve adaptive adjustment.

A tube centrifuge consists of a body, transmission device, drum, collection plate, and inlet bearing seat. The upper part of the drum is a flexible spindle, and the lower part is a damping floating bearing. The main shaft is connected to the passive wheels through a connecting seat buffer. The motor transmits power to the driven wheel through a conveyor belt and tension wheel, causing the drum to rotate at high speed around its own axis, forming a strong centrifugal force field. The material is injected from the bottom inlet, and centrifugal force forces the liquid to flow upward along the inner wall of the drum, resulting in layering due to the density differences of different components of the liquid. Tube centrifuge is currently an ideal centrifugal separation equipment. Tube centrifuge is mainly used for liquid-solid, liquid-liquid or liquid-liquid solid three-phase separation. Its smallest separation particle size is 1 micron, which is particularly suitable for extraction, concentration, and clarification of liquid-solid phase differences, small solid phase particle size, low content, and strong corrosiveness of the medium.

A horizontal screw centrifuge is a spiral discharge settling centrifuge. It mainly consists of a high-speed drum, a screw conveyor with a hollow shaft that rotates in the same direction as the drum and has a lower speed ratio than the drum, and a differential. When the suspension to be separated is sent into the drum by the hollow shaft, it is immediately thrown into the drum cavity under the centrifugal force generated by high-speed rotation. The high-speed rotating drum generates strong centrifugal force, which throws solid particles with higher density than the liquid phase onto the inner wall of the drum, forming a solid layer (called a solid ring layer due to its ring shape); Due to its low density and centrifugal force, water can only form a liquid layer inside the solid ring layer, known as the liquid ring layer. Due to the different rotational speeds of the spiral and the drum, there is a relative motion (i.e. speed difference) between the two. The relative motion between the spiral and the drum is used to slowly push the sludge in the solid ring layer to the cone end of the drum, and after passing through the drying zone, it is continuously discharged through the outlet distributed around the circumference of the drum; The liquid in the liquid ring layer is continuously 'overflowed' by gravity from the weir to the outside of the drum, forming a separated liquid.

A horizontal spiral centrifuge is a settling equipment that operates continuously and discharges materials horizontally. The drum and the screw rotate at a certain speed difference in the same direction and high speed. The material is continuously introduced into the inner cylinder of the conveying screw through the feeding pipe, accelerated and enters the drum. Under the action of the centrifugal force field, heavier solid substances deposit on the drum wall to form a sediment layer. The feeding spiral continuously pushes the deposited solid phase to the cone end of the drum and discharges it outside the machine through the slag discharge outlet. The lighter liquid phase forms an inner liquid ring, which continuously overflows from the large end overflow port of the drum and is discharged outside the machine through the discharge port.

The horizontal spiral centrifuge is mainly composed of a drum, a screw, a differential system, a liquid level baffle, a drive system, and a control system. A decanter centrifuge utilizes the density difference between solid and liquid phases to accelerate the settling velocity of solid particles under the action of centrifugal force, thereby achieving solid-liquid separation. The specific separation process is that the sludge and flocculant solution are sent into the mixing chamber of the drum through the inlet pipeline, where they are mixed and flocculated (if they are added before the sludge pump or after the pump pipeline, the flocculation reaction has been carried out in advance). Due to the high-speed rotation and frictional resistance of the rotor (spiral and drum), the sludge is accelerated inside the rotor and forms a cylindrical liquid ring layer (liquid ring area). Under the action of centrifugal force, solid particles with high specific gravity settle on the inner wall of the drum to form a mud layer (solid ring layer). Then, the relative velocity difference between the spiral and the drum is used to push the solid phase towards the cone end of the drum. After pushing out the liquid surface (shore area or drying area), the sludge is dehydrated and dried, pushed towards the slag discharge outlet, and the supernatant is discharged from the large end of the drum, achieving solid-liquid separation. The sentence is:. With continuous use, you may ask how to improve the efficiency of the horizontal spiral centrifuge?

Adjustment of the drum speed of the horizontal spiral decanter centrifuge
The spiral decanter centrifuge should use an involute planetary gear differential, so this reducer has a large transmission ratio and high accuracy. On the whole machine, there is a mechanical and electrical dual overload protection device, so it is safe and reliable to use. If the main motor adopts a power frequency speed regulation type, coupled with a hydraulic coupling, it can ensure smooth operation of the motor. The part in contact with the material is made of stainless steel, which has excellent corrosion resistance. At the same time, the drum speed of the horizontal screw centrifuge can also be adjusted.

The working principle of a Decanter Centrifuge is based on the synergistic effect of centrifugal sedimentation and screw conveying. Its core lies in using centrifugal force generated by high-speed rotation to separate substances of different densities, while leveraging the differential motion of the screw conveyor to discharge solid phases and overflow liquid phases. The following detailed description unfolds from three aspects: material movement processes, key physical mechanisms, and principle differences in various separation scenarios:

Attention to maintenance of horizontal spiral centrifuge

The movement of materials in a decanter centrifuge is a dynamic coupling process of centrifugal sedimentation, radial stratification, and axial transportation, involving complex motions in three-dimensional space (radial, axial, and circumferential). The following description unfolds from four key stages: feeding, centrifugal separation, solid discharge, and liquid overflow, analyzing the motion laws in combination with fluid mechanics characteristics: