Shibli Engineers company supplies pulp cleaners for the pulp and paper industry to remove dense contaminants from paper pulp. These units fall into two basic categories: continuous rejects cleaners that are usually installed in multiple stages to remove fine sand from paper pulp and intermittent rejects cleaners that are designed to collect larger reject material and to discharge it intermittently to minimize fiber loss.
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These cleaners are fabricated from many types of material; however, stainless steel is most commonly used for the body. Some cleaners are designed with replaceable internal liners, which are made of various materials including epoxy or ceramics, to maximize cleaning efficiency and to prolong wear life by combating conditions where abrasion, corrosion, or high temperature exists. These cleaners are also designed with replaceable internal orifices to provide operating flexibility in the field. They also incorporate heavy-duty reject collection chambers and automatic reject discharge systems designed to operate under high pressure and to withstand the increased abrasion caused by today's contaminated recycled paper. High-density cleaners are available in sizes ranging from 6 to 16 in. in diameter, with capacities ranging from 35 to 2,000 lpm. This capacity range corresponds to a pressure drop from 6 to 30 psi across the cleaner. High-density cleaners can be categorized as either free vortex or rotor-induced, depending on the means used to create a vortex. FREE VORTEX CLEANERS. In a free vortex cleaner, wastepaper from the pulper is pumped under pressure into the inlet chamber, and the tangential entry design of the cleaner inlet allows it to convert the kinetic energy of the pulp slurry into a rotating mass within the cleaner . As the slurry rotates inside the cleaner, shear planes are caused by acceleration of the pulp slurry as it travels from the outside diameter of the cleaner radially inward toward the axis of rotation, where it is then diverted upward through the vortex finder out of the top of the cleaner. These shear planes tend to strip high-density particles from the pulp fiber. In addition to the shear planes, the rotational motion results in extremely high centrifugal forces that push high-specific-gravity particles to the outside of the cleaner wall where they migrate down into the heavy reject collection chamber. Rejects are then discharged intermittently by an automatic discharge system. |
Saturday, September 13, 2008
High Density Pulp Cleaners
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2 comments:
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