Effect of high speed refrigerated centrifuge | centrifuge operating parameters on the effect of dehydration

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Experimental conditions: high speed refrigerated centrifuge to understand 95.81% rate for water experiment of oily scum, scum oil content of 18.7 g / L, differential 5 R / min, adjustable impeller diameter of 270 mm, the centrifuge feed amount of 7.5 M / h 890 L / h, dosage of flocculant. Along with the increase of centrifuge drum speed, dry mud water content gradually decreased, but the recovery rate of solid have certain degree decreased; when the speed reached 2800 R / min, dry sludge water content and recovery rate of solid change slow; when the speed exceeds 3200r / min, although the speed continues increasing, dry sludge moisture content and the solid recovery rate of change is not large. This is because the larger the drum rotational speed, the centrifugal solid particles settling faster, better dehydration effect. But the drum speed is too high will cause the dross particles have been broken again and the effect of flocculation centrifugal sedimentation, thus the rotation speed of a rotary drum pick in 2800 ~ 3200 R / min scale with the appropriate. Along with the addition of differential, dried mud water content increased. This is because in the rotating cone angle must be the case, with spiral add conveyor speed, high speed refrigerated centrifuge found solid transport to add liquid and solid particles, turn the separation barrel in the residence time in the barrel of cut, resulting in the solid particles in centrifugal sedimentation incomplete. Therefore, in the premise of the timely delivery of solid particles settling in turn on the cylinder wall, some differential as small as possible, to ensure the dry sludge moisture content in the lower level. Along with the increase of differential, solid recovery rate were not significantly changed, clarify the differential of the solid recovery rate the influence is not very big. Follow can add adjustable impeller diameter, dry mud water content significantly decreased, and the solid recovery rate changed little.
High speed refrigerated centrifuge found centrifuge adjustable impeller diameter size of 220 to 280 experiments with mm. Change the adjustable impeller diameter is the main purpose of the discharge volume of conditioning of water and oil. After water was discharged and adjustable impeller can be on the pressure, adjustable impeller diameter is larger, the water discharged from the discharge of oil were more, less, dry mud water rate is low. On the contrary, if adjustable impeller is too small in diameter, drum water can not be discharged in time, dry sludge moisture content will rise. Adjustable impeller diameter less than 240 mm, oil and water will be discharged from the discharging port, resulting in not normal dehydration centrifuge. In addition, high speed refrigerated centrifuge to understand dispersed in the dross in oil less, because the vast majority of oil material is wrapped in the floc scum, isolated oil slick little. Therefore, the adjustable impeller diameter conditioning scale can choose between 260 ~ 280 mm.