Dear Mr. R J Morrish,

You are thoroughly conversant with the equipment, because it is already present with you. so, you will be right person for practical solution. Mine is only a loud thinking.

Generally, there is strong wind at sea shore, and it certainly carries away the dust when material is dropping from grab bucket to the hopper mouth. When I saw such installation, I also had a thought that why is the dust containment lacking? I have seen the wind carrying away the dust / material when it is falling from grab to the hopper mouth.

If we prevent blow of wind across the material fall, it will reduce the dust loss / spreading.

Now, grab bucket has entry exit passage on one side of hopper. If we can create vertical enclosure on other three sides of the hopper, then wind will not cross the dropping path and it will reduce the dust loss / spreading. As three sides are blocked, the straight path of wind will have a barrier. Some wind will be certainly present but its magnitude will be much less because it will have to change direction from horizontal to vertical.

The enclosure can be of thin metal sheet or flexible canvas, sufficiently wide enough to take care of grab bucket swing. People with the equipment or designers may examine such a feasibility, but I do not see other alternative, for a material like clinker. For some other materials dust loss reduction is possible by spraying water mist, if it is not objectionable to the material.

In existing equipment, incorporation of such feature will present certain problem but needs to be tackled accordingly.

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 ■

Ishwar Mulani has made the right suggestions as far as containment is concerned. If you can add Burnley baffles to the top of the receiving hopper, dust collection exhaust flow can be limited to 15 to 25 cfm/square foot, according to the open area of the hopper. Exhaust from below the baffles but be careful with placement of the exhaust connections so that they cannot be covered and blocked if the hopper is overfilled. Talk to your Burnley baffle supplier about that.

I would not try dust suppression with cement clinker. That is asking for trouble and will not be as effective as Burnley baffles with dust collection.

Michael Reid. ■

Dear Sir,

- Hide quoted text -

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