Removing unwanted substrate particles with a Grubbens HDC
Sweden-based Cellwood Machinery, a company that develops, manufactures and supplies machinery and systems for the pulp and paper industry, has launched a new application for its Grubbens High Density Cleaners (HDC), biogas plants. The Grubbens HDC is used to remove heavy rejects such as staples, stones, sand, glass, nails and other unwanted particles from the pulp or substrate suspension using the vortex separation principle. Particles that have a higher density than the pulp or substrate suspension, such as screws, nails, staples, steel parts, stones and pebbles are effectively removed and gathered in the reject chamber. An automatic cycle empties the reject chamber on a pre-determined interval. Dilution water instrumentation is included with the machine whereas reject handling and PLC control are available options. The cone as well as the inlet part can be ceramic coated to counteract heavy wear. The inlet flow rotates in the cleaner. Accept substrate rises in the central vortex in the center of the cleaner and rejects sink into the reject chamber. Typically an installation at a biogas plant is before any substrate is pumped into a digester to remove any heavy particles and thereby avoid sedimentation occurring in a digester. A full-scale plug’n’play unit can be rented to evaluate the efficiency and performance of the HDC for a given process.