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Thread: Air Pollution Control Equipment

  1. #1
    Richard Davies - Dustex, USA Guest

    Question New Technology

    As a manufacturer of product recovery and air pollution control equipment since 1947, we are always on the lookout for NEW or INNOVATIVE technology that we can apply within our North American marketplace. Should you have or know of something new, please contact me at your convenience. Thank You.

  2. #2
    Two of the common problems that I have seen are bags falling from the tube sheet to the bottom of the bins, and lack of understanding on how to ground the bag assembly. Bags fall because the diameter of holes in the tube sheet is very close to the diameter of the lip of the bag. I have not seen any vendor who makes bags with sewn grounding wires.

    You may like to consider changes in the design of your dust collectors to make these two improvements.


    Amrit Agarwal (Tim)
    Pneumatic Conveying Consultants

  3. #3
    johnp Guest

    Truck Unloading Dust Control

    We are looking at a facility to unload mineral sands by tip-truck into a 50 t hopper, and reclaiming onto a 500 mm conveyor belt.

    After costing out our preliminary design almost half of the cost was for Dust Control. There seems to be little room to manouver in cost savings. We need a baghouse and that soaks up big bucks.

    The trouble is if you are blowing air, you have good control. If you are sucking air your control is highly limited, particularly if you want to prevent dust settling in the ducts.

    Are there any new developments in dust control around tip-trucks?

  4. #4
    capotex Guest

    Lightbulb CAPOTEX

    Dear Mr. Davies,

    We are manufacturers of conveyor belt hoods, and distribute them all around the world. Here, in Europe, we work very closely with manufacturers of dust suppression systems like yours since both products are complementary. It is good to know your company just in case we have any project in your country and our client requests for a complete dust reduction system. Also, if you need some more information about our company you may visit our web page:

    or just write me down and I will mail you some information. In addition, if you have any question you may contact me.


    Javier Saura
    Export manager

  5. #5
    George Baker

    George Baker

    Vice President- Corporate Communications

    Assinck Ltd. [eDir]

    Assinck Ltd.

    Professional Experience 39 Years / 8 Month George Baker has 39 Years and 8 Month professional experience

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    Know-How Screening (373) George Baker used this tag 373 times, Manufacturer (110) George Baker used this tag 110 times, Conveying (28) George Baker used this tag 28 times

    NEW dust collecting technologies

    i have some interesting new systems..........applying to the aggregate industry......which is constantly fighting the suppression of calm down their neighbours who are constantly complaining.

    These systems to NOT use copius amounts of free water to suppress airborne dust........but, use compressed air to FOG the airborne dust and eliminate the condition.........and NOT create other problems with free spray water and dust........intermingling on the ground and causing havoc.

  6. #6
    capotex Guest
    Will you please send me some information on those systems?

  7. #7
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 7 Month Lawrence K. Nordell has 58 Years and 7 Month professional experience

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    Dust Control in Transfer Stations

    Mr. Davies and JohnP

    There is a new science of dust control. Some have labeled the science "passive dust contol". The principle is based on the concept of dropping the gas velocity below the particles terminal velocity in which the particle will fall against the pull of gravity.

    The ore charge flows and displaces gas in and about itself. The disturbed gas field, can under many circumstances, be controlled. Boundary surfaces can direct both the ore flow direction and gas dynamics. Gas dynamics is now being controlled by strategic placement of baffles or curtains sometimes called "stilling chambers". These chambers act in a manner similar to the silencer of a gun. Provide expansion chambers, in critical locations and sizes, to absorb the gas dynamic pressure and velocity gradients. As the gas enters these chambers, its velocity is significantly reduced allowing the fugitive dust to decant.

    Different treatment is used in the design of continuous flow verse intermitent flow.

    Give us a call and visit our website to explore the potential.

    Lawrence Nordell
    Conveyor Dynamics, Inc.
    1111 West Holly St.
    Bellingham, WA 98225
    ph 360-671-2200
    fx 360-671-8450

  8. #8
    Join Date
    Apr 03
    Dear Mr. Davies and all interested parties,

    The basics of dust control lies in being able to control and predic material flow as to prevent the dust from being generated in the first place. We have an extensive back ground in material handling and discrete element menthods (DEM) technology and have applied it to a wide range of industries and many coal handling power plants in transfer point designs as to limit the dust and eliminate as much of the dust as possible if you would like to know more please visit our web page at:

    or our webpage that deals directly with DEM technology at

    If you need anything else or have questions that I can maybe help you with or application and problems that you might need help with please fell free to contact me directly.

    Best regards,

    Grzegorz "Greg" Dewicki
    Overland Conveyor Co., Inc
    Applied DEM, Inc

    303-716-0569 - Direct

  9. #9

    Truck unloading dust control

    There is no magic involved in dust control at truck dumping stations. If you are tipping through a road grid, you need Burnley baffles below the grid to contain the displaced air. A dust collection system can be sized for the surface area of the grid (cu.m/h per sq.m) with appropriate allowances for dustiness/fineness. A properly designed ducting system willl not block and wear can be minimised. Unfortunately, you do need a baghouse and that costs money. However, proper sizing and selection of an appropriate design will minimise maintenance and operating costs.
    The design of the hopper and the duct connections is CRITICAL to successful operation (exhaust is from below the baffles). You must ensure that the ducts cannot be blocked at the hood entrance because truck drivers will always overfill the hopper above the road grid. A drive-through arrangement is best for efficiency. A roof and side walls to exclude weather and minimise wind influence is also essential.
    Dust suppression using water sprays will not work in this case. Fine mist is easily dispersed by light drafts. Once the dust is airborne, it is very difficult to knock down.

    Michael Reid.

  10. #10
    Richard Davies - Dustex, USA Guest

    Thumbs up

    There are bags available with braided stainless steel wires sewn into the media. The wires may then be attached to fasteners in the tubesheet.

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