PIPE SYSTEM FOR RECEIVING AND TRANSPORTING LIME SLUDGE FROM A WHITE LIQUOR FILTER

摘要

The invention relates to a pipe system for receiving and transporting lime sludge from a filter medium in a continuously operating pressurized filter (1) in a causticizing process, where lime sludge is scraped off from the filter medium (2) and falls down into receiving chutes (4a) for the lime sludge. In accordance with the invention, the conventional storage tanks for scraped-off lime sludge and their mechanical agitators are thus replaced by a pipe system (11) where the pipe system does not have a mechanical agitator at all but has a flow cross section which maintains a flow rate in the lime sludge so that sedimentation of the lime sludge does not take place from the receiving chute (4a) to the feed-out opening (30) of the pipe system. In an embodiment, use is made of a recirculation system (12a-c) for ensuring a good flow rate throughout the pipe system (11), even if lime sludge quantities received decrease. The recirculation system can also be used in order to keep the receiving chutes (4a) free from clogging.