Drilling mud decanter centrifuge is the 4th phase solids control equipment. It is usually used after mud cleaner or drilling mud desilter. The decanter centrifuge can separate 2-7 μm solid out of drilling mud. It is very important to whole drilling fluids purification system.

The separation process in a decanter centrifuge relies on a few process characteristics such as centrifugal force or G-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 solid from the liquid. This characteristic is dependent on the radius of the centrifuge and its angular rotational speed. G-force is related to the gravitational acceleration and centrifugal acceleration inside the bowl. A decanter centrifuge applies a gravitational force of several thousand Gs, which reduces the settling time of the particles. It is also favoured to maintain a large G-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 utilising flocculating agents. The sedimentation rate is also dependent on the separating factor of the decanter centrifuge, which takes into account the centrifugal force and the gravity in the centrifugal force field.

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 affect 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 G-Force also plays a role in the clarity of the liquid discharge. Higher G-force results in an increase in the separation of the solid particles from the liquid and yields a better clarity.

As a professional supplier and manufacturer of drilling mud decanter centrifuge, KOSUN can manufacture high performance decanter centrifuges. At the same time, KOSUN is the pioneer in China oil drilling fluids solids control industry, we can provide solids control equipment including shale shaker, shale shaker screen, desander, desilter, vacuum degasser, centrifugal pump, submersible slurry pump, shear pump, mud agitator, mud gun, drilling fluid mud cleaner, decanter centrifuge, jet mud mixer, mud tank, diesel tank, water tank and complete solids control systems, etc.