The decanter centrifuge for mud dewatering is a separation device. Due to the rotation of the drum, the settling force in the device is many times greater than gravity. Theoretically, the ability of the centrifuge to separate solid particles from the liquid slurry is controlled by the characteristics of the imported slurry. Using the results calculated by Stokes' law, the ability of the centrifuge to separate the imported slurry can be theoretically predicted. The particle size and density of the particles and the density and particle size of the liquid phase will affect the separation capacity of the centrifuge. As the particle size of the solid phase increases, the density of the solid phase particles increases, the density of the liquid phase decreases, and the viscosity of the liquid phase decreases, the ability of the machine to separate the solid phase will increase. Other factors such as particle shape and porosity also affect the separation effect. From a mechanical and practical point of view, the variables that have the greatest impact on centrifuge separation are settling time, centrifugal force, torque characteristics, and inlet mud flow. These factors will now be discussed in detail. 1. Settling time The settling time depends on the size and shape of the centrifuge drum and the thickness of the liquid layer. The drum may be conical or a combination of conical and cylindrical. The first centrifuges used in oil fields were conical rollers. Many centrifuges in oil fields today still use a conical design, but they also have a cylindrical / conical (outline) design. When the diameter and length of the drum must be fixed, the cylindrical / conical (outer shape) design can provide a larger internal settlement space, the residence time of the slurry in the drum is longer, and the separation ability is stronger. If all other processes and design considerations are the same, compared to conical centrifuges of similar size, cylindrical / conical centrifuges have the following advantages in performance: (1) Under the larger inlet flow, keep the same separation point. (2) Under a constant inlet flow, keep the separation point low. Whether these design advantages of cylindrical / conical barrel centrifuges are needed depends on the drilling conditions encountered. If the inlet flow rate is larger or the separation is better (thinner), a centrifuge with a stronger capacity is usually needed. The thickness of the liquid layer in the centrifuge can be changed through the overflow port (big end) of the iron cylinder. Based on experience and manufacturer's recommendations, the final liquid layer thickness at which the best performance can be obtained can be determined. Generally speaking, the thicker the liquid layer, the better the separation effect. The maximum thickness of the liquid layer is mainly limited by the requirements of mud cake and discharged solid-phase humidity. Normally, the thicker the liquid layer, the wetter the mud cake is. For this case, the choice of most optimal liquid layer thickness is a compromise. 2. Centrifuge The higher the speed of the centrifuge, the greater the centrifugal force applied by the centrifuge to the imported mud. Under ideal precipitation conditions, the greater the centrifugal force, the higher the solid phase removal rate. However, it must be noted that, like any part of a rotating machine, the higher the speed, the greater the wear and tear, and the more maintenance work is required. For these reasons, the working speed of most oil field centrifuges is 1600 ~ 2000 rpm between. The design characteristics of the centrifuge will determine the optimal speed range, in this speed range, the solid phase removal effect is good, and the minimum failure is extremely. 3. Torque characteristics Generally speaking, the greater the centrifugal force, the more difficult it is for the screw conveyor to remove the mud cake, and as a result, the conveyor torque increases. The greater the solid phase concentration in the imported mud, the greater the torque. Regardless of any centrifuge, the torque allowed by its design is constant. In order to maintain this torque value, it may be necessary to reduce the speed and reduce the inlet mud flow. 4. Flow of imported mud In specific applications, the capacity of the centrifuge is also affected by the flow of mud at the inlet of the centrifuge. For any centrifuge, reducing its inlet mud flow will increase its separation efficiency (lower the separation point). In the actual operating range, the inlet mud flow of the centrifuge is halved, which usually leads to a decrease in the separation point (D50), and the reduction factor is about 0.71. A must-have for all lovers of grilling. Our Wood Steak Plate allows you to finish out the grilling process at its utmost potential. This general Chopping Board keeps grilled food hotter longer and keeps steak knives nice and sharp. Made of gorgeous Acacia Wood, the
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