Drum speed: Adjustment of drum speed can be realized by variable frequency motor.The higher the speed, the larger the centrifuge and the higher the sludge solid content.However, excessive rotational speed will destroy the sludge flocculent and dewatering effect will be reduced instead.In addition, higher rotational speed requires higher materials, which increases the wear on the machine and increases power consumption, vibration and noise accordingly.
Differential speed: Differential speed=(drum speed-helical speed)/differential speed ratio, which is determined by the differential in the centrifuge and is a fixed value. The differential speed of each centrifuge has a reference range.Differential velocity directly affects sludge discharge capacity, sludge dryness and filtrate quality.Increasing differential speed is beneficial to improve sludge discharge capacity, but the dewatering time of sludge will be shortened and the water content of sludge will be high.In addition, excessive differential velocity will increase the disturbance of the spiral to the liquid tank in the clarification zone, and the quality of the filtrate is relatively poor, but the load of the spiral cone material is small.Therefore, the differential speed should be determined according to material properties, capacity, processing requirements and centrifuge structure parameters.
Thickness of liquid layer: The thickness of liquid layer directly affects the effective sedimentation volume of centrifuge and the length of drying zone, and then affects the treatment effect of sludge dewatering.The adjustment of liquid layer thickness is realized by adjusting the height of liquid level baffle when the machine is shut down. The height of each level baffle must be uniform when adjusting, otherwise the centrifuge will vibrate violently when it is running.
With the increase of liquid layer thickness, the residence time of material in the machine increases accordingly, and the quality of filtrate increases, but the length of drying zone decreases and the dryness of sludge decreases.Therefore, the level baffle should be adjusted reasonably so that both the dryness of sludge and the quality of filtrate can meet the requirements.
Process factors: Centrifuges use the density difference between solid and liquid phases to achieve solid-liquid separation. The larger the specific gravity of sludge particles, the easier it is to separate.In order to improve sludge dewatering performance, an appropriate amount of organic macromolecular flocculants such as polyacrylamide (PAM) should be added to make sludge dewatering easier after solid-phase and liquid-phase separation.The choice of flocculant depends on the characteristics of sludge and the operation of centrifuge.
Horizontal centrifuges have certain requirements on sludge concentration. Low or high sludge concentration will affect the dewatering effect.When the equipment is in normal operation, the dosage of flocculant is approximately proportional to the solid content of sludge. Under certain sludge flow, the dosage of flocculant should be adjusted according to the concentration of sludge.Due to the change of sludge concentration, the dewatering effect will be affected if the dosage of flocculant is not adjusted in time.In addition, if the flocculant dissolves poorly, it will also affect the flocculation effect, which further affects the treatment effect of horizontal centrifuge.