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Thread: Dust Supression

  1. #1
    JPD3362 Guest

    Dust Supression

    As part of project for the Nebs management certificate I am looking at ways to control the air borne coal dust which occurs on the conveyor system at the coal fired power station where i work. would be greatfull for any ideas on this issue.
    many thanks jon

  2. #2
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 8 Month Lawrence K. Nordell has 58 Years and 8 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

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    Jon,

    Drop me an email and I will send some relevant papers on the subject wiith respect to transfer chutes and how we control dust emissions, spillage, belt wear, liner wear, and coal particle fragmentation around them using DEM and CFD technologies. I can send a series of granluar flow animations - picture worth a thousand words.

    Lawrence Nordell
    Conveyor Dynamics, Inc.

  3. Hello Jon,

    There are a number of service companies in your area that can help. Try contacting Vulcanisers International (at the old BTR plant north of Liverpool) or a belt manufacturer, such as Fenner in the Hull area for information.

    Companies such as Conveyor Dynamics, Martin Engineering, and Benetech can also provide assistance.

    Good luck with your project and certification.
    Dave Miller
    ADM Consulting
    10668 Newbury Ave., N.W.,
    Uniontown, Ohio 44685 USA
    Tel: 001 330 265 5881
    FAX: 001 330 494 1704
    E-mail: admconsulting@cs.com

  4. Hello Jon,

    There are two methods to minimize dust emission in surrounding environment.

    1) Dust extraction system :
    As an example, this is like domestic vacuum cleaners wherein air is extracted at dust generation area, dust separated and clean air is discharged in to atmosphere. Example is only for simple explanation, however, dust extraction systems are of much larger size, in specialized form and designed for continuous operation round the clock.

    2) Dust suppression system :
    The dust suppression system applies fine spray of water or water mixed with chemical. The spray wets the particles and the particles settle down due to heavier weight. Dust suppression is often preferred however, its limitations are:
    - Addition of water / moisture, can be objectionable for certain material.
    - One avoids to add water / moisture before crushing / before screening, because it may interfere with the crushing / screening operation.
    The dust suppression is also used to prevent dust being carried by air / wind from stock-pile surfaces. In this, water is sprayed on stock pile surfaces at regular time intervals, automatically.


    Both the above systems have been extensively used in India in many coal-based power stations (around 150 power stations).

    There are manufacturers of both these systems in UK. You can contact them and seek their suggestions / recommendations / literature.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyor.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916

  5. #5
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 8 Month Lawrence K. Nordell has 58 Years and 8 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Searching nothing specified

    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    A 3rd Method of Dust Emission Control

    A 3rd Method of Dust Emission Control:

    PREVENTION: don't generate the dust and you don't have to extract or suppress it. Properly designed chute transfers, using engineering physics of solids granular flow and gas dynamics turbulence, will minimize dust emission levels and overall maintenance. Chute designs can be compared and differences quantified which exhibit lowest gas velocities to warranty dust leves by particle size.

    Why spend unnecessary monies on collection and suppression?

    Lawrence Nordell
    Conveyor Dynamics, Inc.
    website & contacts: www.conveyor-dynamics.com

  6. #6
    Join Date
    May 02
    Posts
    23
    Getting to the root cause is the key to dust supression. Introducing any outside agency into the system may complicate airflows and complicate the problems. Good transfer design is the key. Also look at carryback, which often create as much dust as the transfer. Good luck.

  7. #7
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 8 Month Lawrence K. Nordell has 58 Years and 8 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Searching nothing specified

    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    A response to Glenn Segrs comment:

    Belt carryback occurs from: a) poor belt cleaner adjustment, b) poor belt cleaner selection, c) distressed belt surface such as a cracked / irregular and broken surface, or d) adhesive muck which cannot be cleaned by normal means.

    a & b) is a mindless fix

    c) belt surface distress is often caused by excessive impact damage to the belt at the load transfer point. This type of damage can be avoided by proper chute design. The surface of the belt can then be cleaned by conventional means. Carryback is eliminated.

    d) use special devices such as high pressure / low volume water knife.


    Lawrence Nordell

  8. #8

    Dust Suppression

    The most benefit from dust suppression comes from water addition to the material stream in small increments at points where the material stream is changing direction (at a transfer) or where it is being crushed or other places where the stream is opening up. The dust adheres to wet larger lumps and is retained in the material stream. Fine dust, once airborne, is difficult to knock down with fine water droplets. Fine sprays are easily dispersed by the drafts inside chutes and will wet the sides of the chutes, edges of belts etc. and cause problems. Coarse, low pressure, narrow angle sprays are able to be aimed precisely to avoid overspray. Proper design of the hardware is essential to prevent dribble.
    Chemicals additions provide no benefit, in my experience, except where used to consolidate haul roads or to cap stockpiles.

    Michael Reid.

  9. Dear Jon,
    please have a look to our www.vsr-industrietechnik.de

    We are an international manufacturer of dust suppression systems.

    Please don't hesitate to contact me directly

    email:schlabach@vsr-industrietechnik.de
    VSR Industrietechnik GmbH
    Export Manager
    Wolfgang Schlabach

  10. #10
    Join Date
    May 02
    Posts
    23

    New innovation in dust supression

    Gulf conveyors, www.thegulfgroup.com.au have a patented sytem called GCAT. It uses the principles of controlling the acceleration, velocity and angles of impact and incorporating air stilling and airflow control methodology to reduce dust generation to very acceptable levels.

    GCAT has ben very successful with coal and alumina in Australia.

    Bag filters are not used and there is no power input into the system. No maintenance is required. Look at the website or contact me to find out more.

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