Hopper Design

Radio active mass flow measurement by measuring the rate of change of coal level in the hopper and the instantaneous coal density (or 0.8g/cm3). You may provide rotary valve followed by screw conveyor to remove the material from hopper.

how can i decide the throat size(diameter) for feeder device. Other wise material will be block and will not feed.

not being my area, nevertheless I have seen hoppers for food products (flour, spices etc.) which use vibration motors (adjustable via moveable bob weights) bolted to the hopper side panel to encourage flow, might these help?

Find a laboratory to test your material, there is a huge range of properties from different types of coal.

A quick search found this one to give you an idea of what to look for.

thanks... i try to find a lab. is there any handbook or tables to find a internet?

Search here at Jenike & Johanson. I don't know of any other places.

I wonder about using a mechanism like a flour sifter in the bottom of the hopper. This is just a brainstorm; I have no idea if it would really work. Vibrators are often useful; you might play around with the direction of vibration--vertical, horizontal, etc. Or maybe a delumper "corkscrew" reaching from the top down toward the hopper bottom.

You must evaluate the entire application as an integrated system. These will affect the size and type of discharge on the hopper. Can you supply additional information?

- Confirm the hopper volume or total weight of material to store.

- Confirm exactly how you wish to "collect powder" from the hopper. Are you sampling material, or discharging into a downstream process?

- What volume and rate will you collect / discharge material from the hopper?

We will need to consider the following to sketch out a design.

1. Material chemical analysis

2. Moisture content at any given time of day and year

3. Material sieve analysis

4. Location of hopper, outside, inside?

5. Location of plant

6. Material use

7. Material flow sheet, storage comments

8. Any restrictions in size, height, etc.

Please contact T.C.Inc. directly at tcinc002@aol.com

Having a similar problem but with ground polystyrene in a hopper it would constantly bridge near the screw auger area.

The only cure we were ever able to make work was a vibrator near the feed to keep it shaking.

we even went with hoppers with extremely steep walls like 60 degrees! and it still would bridge. the vibrator cured all problems

thanks for you advices.

i need to store 250Kg in the silo and it need to discharge via a screw feeder of 4". i need 7Kg within a minute.

i just look some silo designs. they had an angle of 60. so i decided to fabricate the silo cone to 60 degrees

Thank you very much. i'll try to find a manufacture.