Apparatus for handling fine bulk material

An auger shaft comprising:

• a first tubular conduit formed of a gas impermeable material, having a closed end and an opposed open end, providing an axially disposed passageway extending from the open end to the closed end with at least one radial outlet passageway,
• a second intermediate tubular conduit formed of a gas permeable material, encompassing and spaced from the first tubular conduit, the second conduit having closed opposite ends, the second conduit providing with the first inner tubular conduit a first annular passageway communicating with the radial outlet in the first tubular conduit,
• wherein a pair of annular sealing components close the first annular passageway at the opposite ends and space the second intermediate tubular conduit from the first tubular conduit, wherein one said annular sealing component is respectively at each of the opposite ends of the first annular passageway;
• a helical member mounted on the second tubular conduit,
• the first tubular conduit's first open end in communication with the axially disposed passageway of the first tubular conduit,
• the axially disposed passageway through the radial outlet in communication with the first annular passageway, and
• the first annular passageway through interstices of the permeable tubular conduit in communication with spaces between flights of the helical member.