GNLW363 FHD centrifuge is designed expressly for removing low specific gravity solids from slurries and drilling fluids. In one type of processing, solids are removed and the liquid is returned for recirculation. Alternatively, solids are returned to the active system and the liquid is discarded.
GNLW363C-FHD decanter centrifuge is fully hydraulic drive. The bowl speed and conveyer speed is adjustable within the permitted range. It can achieve independent, step-less and large-range speed regulation for the bowl and conveying. The bowl speed and conveyer speed during working is showing on the screen.
The mechanical operation principle of a full hydraulic drive decanter centrifuge is as below:
- The centrifuge employs centrifugal force produced by the high-speed rotation of a cylindrical bowl to separate solids from slurry. Centrifuge performance is based on three variable factors:
- Force exerted on the fluid – Centrifugal force pulling fluid against the outside wall of the Centrifuge
- Retention time in the centrifuge – The longer the slurry remains in the centrifuge the smaller the particle that can be separated
- Differential speed of conveyor – The faster the conveyor rotates the wetter the solids
All three factors may be manipulated in GNLW363C-FHD centrifuge to alter the liquid and solids discharge. The centrifugal force is adjusted by varying the bowl RPM. Retention time is controlled by adjusting the liquid discharge ports on the liquid bowl head to vary the pond depth (depth of liquid remaining in the bowl), and the feed rate to the unit (the lower the feed rate, the higher the retention time).
The conveyor operates at a slightly lower speed than the bowl. The conveying speed is the difference between the bowl and conveyor speeds. During decanter centrifuge operation, the CONVEYOR SPEED indicator on the hydraulic control panel displays the number of conveyor RPM less than the current bowl RPM. For example, a displayed conveyor speed of 30 with a bowl speed of 2000 RPM translates into a conveyor speed of 1970 RPM.
Other than pond depth, all other parameters may be changed quickly and easily to adjust the equipment for optimum efficiency in response to varying the feed conditions. For best performance, the slurry should be screened to 74 microns in vibrating screening machines before passing to the centrifuge for processing.