GN Solids Control makes 2-phase and 3-phase decanter centrifuge with fixed speed control, FHD control or VFD control.
The VFD panel of GN Solids Control VFD decanter centrifuge is equipped with vortex self-cooling system. GN Solids Control will ask clients what is the max. ambient temperature in summer at their job site? For high temperature areas, GN Solids Control will make high standard VFD panel with A/C cooling system for for self-cooling.
As 3-phase centrifuge can only allow slurry with max. 10% solids content and particle size less than 2mm, 2-phase decanter centrifuge is must to be used before -phase separation to reduce the mud weight and solids percentage. After 2-phase centrifuge separation, the oil, water and soil mixture slurry flow into 3-phase decanter centrifuge to get oil, water and soil.
In order to remove as more ultra fine solids as possible, chemical dosing unit will be used together with decanter centrifuges for dewantering flocculation treatment. GN Solids Control can offer the 3-tank antomatic chemical dosing unit. It is used for powder chemicals. If clients will use liquid chemical, GN Solids Control have other options to fit for neither powder chemicals or liquid chemicals, or both.
As most clients may know, the pre-separation equipment for OBM cuttings and oil sludge is different. For pure OBM cuttings from shale shaker and mud cleaner, Vertical cuttings dryer is better. It can reduce the oil on the cuttings to 3% ~ 5%. It can remove more usable liquid. And the solids discharge is very dry.
But vertical cuttings dryer cannot be used to treat the soil sludge discharged from centrifuge. As its screen basket opening is 0.5mm, 0.35mm and min. 0.25mm. The soil cake from centrifuge is very fine and will all pass the screen opening.
Oil sludge is normally the mixture from different application, like drilling mud, drilling cuttings, soil cake from centrifuge separation, tank bottom slurry, slope oil, refinery waste oil slurry, industry waste oil, etc… The solids size and solids content is more complex. In this case, high G drying shaker is used for pre-seperation. And as the oil slurry is more complex, sometime, need to dilute and heating the sludge before separation. The solids waste discharge from High G drying shaker is with higher oil on the cuttings after separation. For example, before treatment the sludge with 15~20% oil content. After high G drying shaker, maybe around 10~15%, or even higher if the sludge with high viscosity and density.