Separating Decanter Centrifuge

By separating the water and solids from the sewage, nightsoil, and livestock wastewater sludge as well as the sludge from a concentration and from the dewatering process, this centrfuge maintains a constant cake moisture content and recovery rate.

It is used when the solids are in a poor condition because of extra sedimentation and the mixed sludge from livestock, nightsoil, andsewage treatment plants.

Decanter centrifuges process characteristics
The separation process in a decanter centrifuge relies on a few process characteristics such as centrifugal force or force, sedimentation rate and separating factor, differential speed between the conveyor and bowl, and clarity of the liquid discharge. Decanter centrifuges require a centrifugal force for the separation of the solids from the liquid. This characteristic is dependent on the radius of the centrifuge and its angular rotational speed. A decanter centrifuge applies a force equivalent to several thousand , which reduces the settling time of the particles. It is also favored to maintain a large force, which will result in an improved separation.
The rate at which sedimentation occurs is an important characteristic of the decanter centrifuge separation process. The
sedimentation rate is influenced by the particle size, the shapes of the particles, their differential densities and the viscosity between the particles and the liquid. This process characteristic can be improved by utilizing flocculating agents. The sedimentation rate is also dependent on the separating factor of the decanter centrifuge, which is related to the centrifugal force.
The exterior bowl and the scroll conveyor rotate at different high speeds. This differential speed between the two is accountable for the sedimentation throughout the decanter centrifuge cylinder. A high differential speed results in a smaller residence time of the cake settlement, so it is necessary to keep the cake thickness to a minimum to avoid impairing the discharge quality.
Keeping the cake thickness to a minimum also aids in the improvement of the cake dewatering process. For this reason, it is necessary to obtain an optimal differential speed to balance the cake thickness and quality.
The characteristic above all affects the clarity of the liquid output which is dependent on the volumetric throughout rate, where a higher flow rate will result in a poor liquid clarity. Another characteristic that influences the clarity of the liquid output is the differential speed. A low differential speed results in a better clarity, therefore, aiding in the separation process. The Force also plays a role in the clarity of the liquid discharge. Higher force results in an increase in the separation of the solid particles from the liquid and yields a better clarity.

Solid Liquid Separation Drilling Decanter Centrifuge For Drilling Fluid / Oil Field
Drilling mud is an integral part of most drilling operations,it is also called drilling fluid, there are some solids suspended in
the fluid. Shenzhou Decanter Centrifuge can provide solid-liquid separation technology to your drilling mud application, enabling reuse of the material and more efficient and cost-effective disposal.We have our special design and collocation decanter centrifuge for oilfield and industrial solids control, drilling fluid / mud cleaning and process water treatment. Shenzhou Decanter centrifuges are used to process water-based and oil-based drilling fluids. Oilfield decanter centrifuges mechanically increase the gravitational force exerted on the liquid and solids mixture present in the mud system. We can apply over 3,000 G-forces machine to separate the particles in the fluid. Shenzhou Decanter centrifuges have wide process capacity to meet all ranges as per drilling program.It is commonly and widely used used for oilfield and gas well operations providing efficient solids control while significantly reducing the operator's total mud cost and minimize waste disposal volumes.

LW means horizontal spiral type which is a normal model of decanting centrifuge Solids. Decanter Centrifuge is the last stage equipment in drilling mud system for solids control and mud cleaning. The superiority of Decanting Centrifuge is embodied in the solids processing size. Decanter Centrifuge could remove the solid particles with size 2-7 microns using the principle of centrifugal action, it is an ideal choice for separating particles in drilling mud. Always there is a screw pump or submersible pump to feed the mud to Decanter Centrifuge. After the drilling fluids being fed into the centrifuge drum, under the function of centrifugal force, solid phase particles are pushed to the internal wall of the drum, then to the solid discharge export of the small end of the drum and excreted. While the fluids is excreted from the overflow hole of the large end. Such cycle is to achieve the purpose of continuous separation. High speed decanting centrifuge are more effective for separation of fine solids.

The feed product is pumped into the decanter centrifuge through an inlet. Feed into a horizontal bowl and then rotate. The bowl consists of a cylindrical portion and a conical portion. The separation takes place in the cylindrical part of the bowl. Fast rotation produces centrifugal forces of up to 4000 x g. Under these forces, solid particles with a higher density are collected and compacted on the wall of the bowl. The scroll (also a screw conveyor or screw conveyor) rotates inside the bowl at slightly different speeds. This speed difference is called a differential speed. In this way, the scroll conveys the precipitated particles along the cylindrical portion of the bowl to the conical end of the bowl. At the smallest end of the conical portion of the filter bowl, dehydrated solids leave the filter bowl through the discharge port. The clarified liquid exits through the mating disc (internal centrifugal pump).