PROCESS DESCRIPTION OF THE SDU, VCU, TURBULATOR AND TCU
Slurry Dewatering Unit (SDU)
The aqueous slurry coming from the slurry tank, is admitted through a pipe into a feed tank from which it flows uniformly over a static wedge bar screen . The crumbs, thus separated from the free water, fall into the feed section of the dewatering screw.
The screw, mounted at an angle, is designed to accept the crumb, forward it into the compression section of the screw and discharge it through a variable die. Cutting is accomplished by knives turning with the screw. The variable die allows to optimise the pressure conditions and thus the dewatering during operation.
The water expressed from the rubber flows backwards inside the barrel towards the feed zone. The water is removed through drain openings located in the conical and feed barrels.
The extruder (feed sections and barrels) is entirely closed. No water on the floor and no steam inside the plant building. Two flanges, permit evacuation of vapour. Water drains are directly connected to customer recycle water system. There are no slots or other drain openings that would plug, interrupting the process or causing large variations in the degree of dewatering. Barrels are jacketed for preheating.
The screw can be supported by bearings at both ends, with no contact between screw and barrel.