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Thread: Stockpile Moisture Control

  1. #1
    sidney amorim Guest

    Stockpiles Moisture Control

    I would like to know about dewatering or moisture control during
    the handling of metallurgical coke from stockyard to stock house silos.
    Could you help me?

    Thanks a lot

    Sidney

  2. #2

    moisture control stockpiles

    We have designed and had build a 60000 tone capacity stockpile cover for keeping stockpile dry. Client Blue Circle Cement. Very low cost precast concrete solution. been operating trouble free for last 5 years.

    Regards

    Martin Tomlinson
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  3. #3
    Join Date
    Jan 03
    Posts
    26
    Sidney,
    I work in an integrated mill in Detroit that from time to time has many thousands of tons of coke in inventory. We load into rail cars after we screen it and take it to the bins that feed our stockhouse. What is your concern with the moisture of coke in the stockpile? - I have found that moisture tends to build with time to a maximum of 15-20%, but much of the higher moisture material is the fine material. Short storage of several months doesn't really change the coke moisture that much, but long storage over winter would. I don't think winter is a problem in your part of the world.
    HCrosmun

  4. #4

    Smile Moisture in Stock pile

    Additional moisture added due to rain and other climatic condition lowers the heating value of coal. The change in heating value of coal affects plant heat rate.
    Can any one suggest the method/ system to control the water/ moisture in stock pile of coal. Also, excess moisture poses flowability problem.

  5. Moisture content i.e. external addition of moisture can be reduced by following means or working procedure:

    1) Shade over storage. This will prevent addition of moisture / water due to rain, if you are located in a heavy rain locality
    2) Stockyard base should have gradient for moisture / water to drain out at the base. This will be effective if there is large amount of moisture / water which percolates at the base level.
    3) If you have dry weather most of the time, reclaim the upper layer of stockpile at one time and allow the next layer to dry for reclaiming next time.

    I do not think one may find it practical to use hot air flow for drying effect, during material handling process, where handling rates are very high. Process experts can think of drying prior to consumption, similar to heating of boiler feed water before feeding, if it is feasible and commercially viable.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Advisor / Consultant for Bulk Material Handling System & Issues.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 25882916

  6. Moisture control in stockpiles

    I have done some significant study work relating to the stockpile drainage of coking coals.

    The three keys to the issue are; size distribution, stockpile base design and reclaim method.

    If I can help in any way, please do not hesitate to contact me on trevor.learey@anglocoal.com.au

    Regards,

    Trevor.

  7. #7
    rekhawar Guest

    Lightbulb Re: Moisture control in stockpiles

    Dear Sir,

    Ours is an integrated steel Plant. One of the major problem, we face during rainy season is high moisture content in Met Coke while feeding to Stock House.

    We keep around 0.1 Million T of Coke at a time in two yards approx. size 35 mtr x 500 mtrs each. The reclaim conveyor is between the two yards.

    Presently, we are covering the stock pile with Tarpaulin, however it is not very effective in controlling the moisture %age.

    The cost benefit of having a Shed in such a big yard is refraining us from going for it.

    As you have done good study on the subject, will you please through some light on the feasibility of following solutions:

    - Is there any spray available, by which we form a thin film on the surface of the stockpile? This will stop the ingress of rainwater into the pile. The spray shall be chemically inactive and should not interfere in the BF operation.


    Expecting an early response.


    Originally posted by Learey
    I have done some significant study work relating to the stockpile drainage of coking coals.

    The three keys to the issue are; size distribution, stockpile base design and reclaim method.

    If I can help in any way, please do not hesitate to contact me on trevor.learey@anglocoal.com.au

    Regards,

    Trevor.

  8. Dear Shri P. Rekhawar,

    It seems you have got a stacker and reclaimer machine to form linear stockpile. One of the methods is to construct shed over part length of the stock pile. The material on this shed is to be used during wet period of rainy season and during other time, you can reclaim from upper layer of the stock pile which will dry out in to sunshine / wind etc.

    Lignite becomes very difficult to handle if mixed with rainy water, so lignite-handling systems in India at Neyveli and GIPCL Surat, have shed over part length of the stockpile and they are able to operate their system during rainy season as mentioned earlier.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Advisor / Consultant for Bulk Material Handling System & Issues.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 25882916

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