Method and device for the separation of fine particles from granulate-type bulk materials in a pipeline

A method for separating fine particles from granulate bulk materials that are conveyed in a direction as a product flow by one of a compressed air and a vacuum conveyance in a pipeline, comprising the steps of:

• radially dispersing the product flow at an intake end of a pipe screen integrated in an airtight manner in the pipeline, into an annular cross-section;
• aerating the product flow in the annular cross-section by a cleansing airflow flowing in the region of a cleansing plane at an angle to the direction of the product flowing the annular cross-section, said aerating step deflecting deflected material comprising any of lighter particles, fibers, clusters, and dust carried in the product flow from the trajectory of the heavier granulate bulk materials, and conveying said deflected material into an annular sheath connected to the annular cross-section, the cleansing airflow flowing through the annular sheath;
• and
• removing said deflected material from the annular sheath with a separator.