The horizontal screw centrifuge is an efficient equipment for continuous solid-liquid separation. Its basic function is to require the equipment to continuously separate the input materials during operation. To achieve this goal, the centrifuge must efficiently discharge the processed solid and liquid phases from the body while completing the separation, leaving space for a new round of feeding, so as to maintain the continuity and stability of the entire system.
The basic guarantee for stable operation of centrifuge
In the cognition of many operators, the feed system often first associates with equipment such as feed pumps and dosing pumps. However, the core that really affects the stable operation of the centrifuge is whether the various outlet systems operate smoothly.
The outlet system of the horizontal screw centrifuge mainly includes two parts:
Solid residue discharge system: that is, the dehydrated solids discharged from the solid phase outlet at the bottom of the centrifuge;
Clear liquid discharge system: that is, the separated supernatant is discharged through the liquid phase outlet pipeline.
Once these two outlets are blocked, it will directly lead to the accumulation of materials inside the centrifuge, the solid phase will be deposited between the drum and the cover, and the clear liquid will not be discharged in time, thus forming severe friction with the drum at high speed. This process will not only produce severe vibration and noise, but also may cause motor overload, automatic protection shutdown, and even damage the spindle bearing and sealing structure, inducing more serious equipment failure.
It is particularly important to emphasize that if there is a long-term and frequent blockage problem in the outlet system, the solid slag may continue to accumulate in the gap between the cover and the drum, and over time, groove wear will be formed on the surface of the drum. Once the depth exceeds the fatigue limit allowed by the material, it will cause the drum structure to be unbalanced, causing safety risks in high-speed rotation.
The logical sequence of operations must be strictly followed
In order to avoid the above problems, the correct operating process is the key. Before starting the horizontal screw centrifuge, the slag discharge system must be started first and the clear liquid discharge pipeline must be completely unblocked. On this basis, the feed pump and dosing system are gradually turned on.
We usually have a corresponding logic interlock protection mechanism in the centrifuge’s electronic control system to ensure that the feed pump cannot be started without opening the discharge path. However, in some specific processes or customized occasions, this type of interlock logic may be temporarily bypassed, so the operator must have sufficient professional knowledge, clearly understand the correct startup sequence and strictly implement it, and avoid systemic problems caused by human operating errors.
Feeding and dosing: Start with a small flow rate and observe first
During the actual operation, the feed of the horizontal screw centrifuge should be started slowly from a small flow rate, and the dosing system (flocculant addition) should be turned on simultaneously to facilitate the rapid formation of larger flocs in the solid phase of the material and improve the separation efficiency. At this stage, the operator needs to observe closely:
Liquid phase outlet: The liquid should be clear and transparent. If there is obvious turbidity or foam, it may indicate poor separation effect or obstruction of the liquid phase outlet;
Solid phase outlet: Whether there is solid matter discharged, even if the water content is high, as long as it can be discharged stably and continuously, it means that the slag discharge system is operating normally.
When it is found that the liquid is discharged smoothly from the liquid phase outlet and a certain amount of solid slag is discharged from the solid phase outlet, it means that the equipment inlet and outlet are basically unobstructed. At this time, the feed flow, dosing amount or differential speed can be further adjusted to optimize the separation efficiency and processing capacity.
The efficient and continuous operation of the horizontal screw centrifuge depends on the coordination of multiple links, especially the smoothness of the discharge system and the stable operation of the spiral. Operators must strictly abide by the logical operation sequence, from discharging, spiral synchronization, to low-speed feeding, dosing observation, every detail affects the overall performance and service life of the equipment.
A small negligence may cause equipment damage or even production accidents. Therefore, improving the standardization of operations and understanding the logic of equipment operation are the key to ensuring the long-term, stable and safe operation of the centrifuge.
