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Thread: plastic pneumatic conveying

  1. #1

    plastic pneumatic conveying

    We are working in a project for the Polytechnic University of Madrid. We are looking for the best way of introducing plastic (polypropylene) in a pressure fluidized bed gasificator (2 atm).
    How can we do it by pneumatic conveying?, and with another way?.

  2. It is no problem feeding any material into any vessel maintained at any back pressure. I designed and built such a pneumatic conveying facility when I was at Glasgow Caledonian University many years ago and they are still using the facility there today. It is capable of feeding material into a pipeline at pressures of up to 25 atmospheres and conveying the material into a vessel maintained at any back pressure up to about 20 atmospheres. Air or nitrogen can be used for conveying the material. It has a capcity of about one cubic metre or 35 cubic feet.

    So a back pressure of 2 atmospheres is not difficult. There are many pneumatic conveying systems operating against this level of back pressure that feed materials into blast furnaces and molten steel ladles, as well as pressurised chemical reactors. They are quite capable of operating continuously if required. Coal is fed continuously into pressurised fluidised bed combustors maintained at pressures of 10 to 20 atmospheres. A simple blow tank is all that is required, designed to withstand the appropriate pressure. The one in Glasgow is rated at 32 bar or 470 psig.
    David Mills

  3. #3
    Xavier Meyrigne Guest
    Effectivly, to do a pneumatic conveying, it si not the counter pressure which is important, but the differential pressure from the point you come from, to the point you want to go. After, the differential pressure is to adapt, depending of your circuit (lenght, hight, number of elbows) of the nature of the material to convey(gaz speed) the councentration of product/gaz...

    I can help you more if you send me more explanations, like the circuit, the type of material, the design of the apparatus where you want introduce your product... Contact me at xavier.meyrigne@wanadoo.fr

    Best regards

    Xavier Meyrigne

  4. #4
    biplab K. Datta - POSTEC, Norway Guest
    As has already been pointed out in earlier replies, it is not a problem at all to introduce the material. However, you have to use a pressure vessel with the right pressure for your system. In case you need to work out the parameters, we can help you out. We have quite a good test and research facilities in our laboratory. You may visit our webpage or may contact the undersigned.

  5. #5
    A simple design would be to use a pressure vessel (a blow tank) as a feeding device. This vessel should be pressurized to a pressure somewhat higher than the pressure in the vessel you are feeding into. This higher pressure will overcome the pressure drop in the conveying line between the blow tank and the receiving vessel. PP's are generally free flowing. If so, PP should flow freely out of the blow tank. If it is not free flowing you will need to fluidize the blow tank before opening the discharge valve.

    We can discuss the details if you like, at no cost to you.

    Regards,

    Amrit Agarwal (Tim)

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