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Thread: Transport of Cohesive PVC Powder

  1. #1
    bbd Guest

    transport of cohesive pvc powder

    can anyone tell if it is possible to transport cohesive pvc powder(very fine) in plug flow pneumatic conveying system ?!!!

  2. #2
    Dennis Hauch - Freeport, TX, USA Guest

    PVC Xfer

    Yes, it is indeed possible for the technology is well understood. The best results are obtained with bypass systems in which a part of the conveying gas bypasses immoveable plugs in the conveying line. The bypassed gas is reintroduced so as to continuously break off the leading edge of the plug. The plug length is thereby reduced until conveying can again resume.

    Dennis Hauch

  3. #3
    bbd Guest
    hello,

    How about pulse phase conveying as developed by Warren Spring laboratory in UK long back? Can this system be used ?

    But it may be noted that this powder is highly cohesive in nature and is prone to static electric charging!

  4. #4
    James Steele: p Guest
    The Dense Phase conveying of PVC powder has been done many times by Dynamic Air Inc using a system having a very low air to material ratio. The conveying velocity can be as low as 300 feet per minute or as high as desired. To verify this capability you may test your PVC powder at any of our test centers located around the world. Depending upon the distance and convey rate will of coarse determine the actual line size and compressed air required. Therefore to determine exact design parameters we suggest testing be performed.

  5. #5
    I don't know the reasons for your considerating dense phase conveying but if your options are open why don't you consider dilute phase. Dilute phase is a much simpler and proven technology for cohesive PVC powder, and it will result in a much simpler system design. You will not have to worry about dust leakage from pipe couplings or flanges because of the high pressures needed for dense phase.

    If you have decided to go dense phase, my suggestion would be to use bypass type systems which monitor conveying pressure every few feet and automatically inject secondary conveying air if needed to break up a long plug. This kind of system is supplied by Buhler and also by Waeschle. There may be some others also.
    However, if the material is really sticky you should not use dense phase. Because of the high pressure you will form impermeable long plugs in the conveying line.

    Regards,

    Amrit Agarwal (Tim)
    PNEUMATIC CONVEYING CONSULTANTS
    polypcc@aol.com
    Fax: 304 346 5125

  6. I agree with Tims statement concerning dilute phase conveying. Just few weeks ago we have commissioned such a transport line for very fine PVC, using an ekector-conveyor and screw-feeder as dosing unit.

    If you are interested in more details, please contact me under: schneider@enviro-engineeering.de or visit our webpage: www.enviro-engineering.de for more informations about gas-solides ejectors.
    Best regards
    Klaus Schneider, KS-Engineering

  7. #7
    bbd Guest
    Hello,

    Can anybody give me any list of references of articles related to pressure drop at the starting point in the blow tank ! I am looking for any functional relationship with Riser pipe diameter, height from blow tank floor, loading ratio etc !!!!!!

    Can anybody help me ?!!!!

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