View Poll Results: pneumatic or mechanical conveyance for quicklime

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Thread: Compare/contrast of pneumatic & mechanical conveyance for quicklime

  1. #1
    rcbabcock - Maguire Group, USA Guest

    Compare/contrast of pneumatic & mechanical conveyance for quicklime

    I'm looking for your thoughts on the relative merits of replacing an existing vacuum/pressure system in kind or with a new mechanical system. The current system conveys quicklime from storage silos 350 ft via vacuum and then an additional 150 ft via pressure. The system is old and needs replacement. I'm considering simple replacement of the existing components with new equipment and/or installation of a new silo closer to the point of use with a tubular chain drag conveyor to move the lime the 150 ft to the hoppers. Any ideas?

  2. #2
    In my opinion you should still use pneumatic conveying systems. You will have less maintenance, less wear and tear, and easy operation.


    Amrit Agarwal (Tim)
    Pneumatic Conveying Consultants

  3. #3
    Bosentang Guest

    Pneumatic vs. Mechanical

    I must agree with Amrit. Pneumatic systems are less costly to maintain. However, I would add that if you are making a change, then you should consider reducing the lenght of the vacuum system and increasing the lenght of the pressure system. You maybe able to reduce the energy consumption and size of the equipment.

    We would be happy to look at differant pneumatic conveying configurations with you.

  4. #4
    Dear Mr. Ayed,

    You will need the following data:

    Tons of material to be stored
    Bulk density of the material
    Particle Size
    Angle of repose

    We may need other data if mass flow bins are required.


    Amrit Agarwal (Tim)
    Pneumatic Conveying Consultants

  5. #5
    Please disregard the above, my mistake. I have put it in a wrong folder.

    Amrit Agarwal (Tim)

  6. #6
    Dear Mr. Rcbabcock,

    In my view a single conveying system would be better than a vacuum and a pressure type system. A single system will cost less and will be easier to run.

    Most likely it will be a vacuum type system but I will need more data to give you a firm recommendation


    Amrit Agarwal (Tim)
    Pneumatic Conveying Consultants

  7. #7
    Bosentang Guest
    Again I would have to agree with Amrit that a single system should be more cost effective. However, I think that a pressure system would be a less expensive option.

    I used: 50 lbs/ft^3 bulk density
    500 ft Horizontal run
    167 lbs/min rate

    Using this I calculate that a vacuum system would requrie a 5" line running at about 9.5 In Hg with 1200 CFM with a large blower with 30 BHP.

    A pressure system could use a 4" line running at about 6.5 PSIG with 630 CFM with a much smaller blower with 21.5 BHP.

    Also, remember the less air flow the smaller your receiver filters and bin vents will be.

    Of course, this is based on the information above. I would need to know more about your exact project before giving you an accurate comparison.

  8. #8
    i agree that dense phase is a better option. please let us know if you want a quote for a turnkey system



  9. #9
    In my opinion you should retain your dilute phase system and try to re-use your conveying blower to minimize your cost.

    Dense phase (or low velocity) systems are used if particle attrition is a problem.


    Amrit Agarwal(Tim),

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