Effect of low speed large capacity centrifuge operating parameters on the effect of dehydration

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Low speed large capacity centrifuge experimental conditions: with water content of 95.81% 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. Low speed large capacity centrifuge understand that along with the increase of centrifuge drum rotational speed, dry mud water content gradually decreased, but the solid recovery rate also has a certain level of land; when the speed reached 2800 R / min, dry change slows down mud moisture content and solid recovery rate; when the speed exceeds 3200r / min, low speed and large capacity centrifuge understand that although the speed continues to increase, the change of water content and dry mud solid recovery rate is not large. Low speed large capacity centrifuge to understand this is due to the greater the rotor speed, the centrifugal solid particle settling velocity faster, the dehydration effect is better. But the drum speed is too high will lead dross particles have been broken again and the flocculation effect of centrifugal sedimentation effect, so the drum speed selection in 2800 ~ 3200 R / min range more appropriate.
Low speed large capacity centrifuge with increase of differential, dried mud water content increased. This is because in the condition of rotating cylinder cone angle is constant, with the increase in the speed of screw conveyor device, solid conveying can increase the separation liquid and solid particles, rotating cylinder in turn reduce the residence time in the barrel, the centrifugal cause solid particle settlement is not complete. Therefore, low speed large capacity centrifuge to obtain timely walks in the premise of solid particle settlement in turn on the cylinder wall, some differential as small as possible, in order to ensure that the dry mud moisture content in the lower level. With the increase of differential, solid recovery rate did not change significantly, clarify the differential of the solid recovery rate the influence is not very big. With the increase of adjusting impeller diameter, dry sludge moisture content was landing, and the solid recovery rate changed little.
Low speed large capacity centrifuge adjustable impeller diameter range of 220 ~ 280 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 the low speed large capacity centrifuge adjustable impeller diameter is too small, 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, lead can not be normal dewatering centrifuge. In addition, dispersed in the floating oil less, because most of the oil substance encased in floc scum, isolated oil slick little. Therefore, adjustable impeller diameter conditioning range can choose between 260 ~ 280 mm.