I'm new in solid handling and would appreciate your comments. Are there commercial products that can suck solid pellets (0.3 cm diameter from one box (4.5 ft X 4.5ft x 4.5ft) to a containers and/or hopper that are 6 feet elevation? The ideal tool would be a small vacuum device that can suck one product to a centralized area. This same device can swing several feet away to suck materials from another box to the same hopper. Will an eductor driven by a blower work?
Have an insight or suggestion?
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Lee Dudley Forum Moderator 15 Posts
Re: Can you offer short-distance pneumatic conveying solutions?21 October 2009 at 1:29pmThere are several options for short-distance pneumatic conveying, especially for the size of solids described. The most common is a vacuum system. A gas mover (fan, vacuum pump, PD blower) provides suction with a T line before the inlet (one connection goes to atmosphere or filtered air; the others connect the piping from the cyclone to the gas mover inlet). A filter prevents dust from getting in the gas mover and is optional for a fan (assuming regulations permit). The solids receiver is a cyclone with a flapper discharge valve (there are many manufacture of this type of cyclone). The flapper closes on vacuum and opens when the vacuum is removed and the weight of the solids cause it to open (it is spring loaded). The last component is the convey line and can be a hose or a hard-piped line. Normally a timer is used to control the operation. When the T valve is open to atmosphere, the pressure at the cyclone outlet is zero gage pressure and no solids flow from the pickup point. With suction applied (T-valve to atmosphere is closed), solids flow to the cyclone. A timer can be used to limit the size of the batch that is transferred. The spring on the cyclone can be used to limit the batch size, but this is less efficient and can cause carry-over to the filter.
An eductor can be used, but may cause a lot of dust in the work area without a receiver and filter.