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Thread: The solid/air ratio - how to define ?

  1. The solid/air ratio - how to define ?

    The "bloody question" of the dense phase
    pneumatic conveying is how to define the
    solid/air ratio on the first stage of a project.
    Very simple and reliable test based on the
    "flush effect" was developed and used
    to give "green light" or "red light" for
    many projects.
    Sample of 1 kg of a bulk material is enough
    to predict the solid/air ratio as a function
    of the transport distance.
    The very high repeatability and efficiency
    of the test was confirmed by the special
    investigation in the Ben-Gurion University.

    Michael Rivkin

  2. The solid/air ratio - how to define ?

    Dear Dr Michael Rivkin

    OK! You've whetted our appetite - what now?


  3. #3
    biplab K. Datta - POSTEC, Norway Guest

    I am bit unsure about what you are looking for here !!!

    Can you please be more explicit about what you are looking for !

    Could you please explain in a bit more detail the test you use for GREEN SIGNAL ?

    How you define all parameters based on such test ?

    best regards

  4. The solid/air ratio- how to define

    Our target was to get a modified coefficient
    based on an experimental data.
    The percentage of the 1kg sample which is
    thrown out ( under action of the "flush
    effect" ) from the special short pipe, and
    bulk/specific density - the only required
    factors for the coefficient calculation.
    Note: we carried out hundreds of tests to
    find out the only length/dia ratio of the pipe
    and initial pressure to get reliable and
    repeatable results.
    Next step: we have calculated coefficients
    for long row of known materials and data
    of dense phase pneumatic systems,so
    each new coefficient can be compared with
    the known materials coefficients and put
    in the row.
    Now we can confirm that the new material
    transportability (solid/air ratio as the function
    of the distance ) will be similar to cement,
    alumina, pulv.coal (dry or wet ),granular
    potash or other.
    We can confirm also when it is not worth
    to use a dense phase system for the
    tested mareial - solid/air ratio will be too
    low - red light !

    Michael Rivkin

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