Hello,

A few introducing questions may help us to step a few millimeters forward

how long is the way thought for this conveyor (horizontal, vertical, angular, angle)?

This chips are exposed to e.g. 100 mm rain an hour or you are in the middle of the Sahara and the chips never have contact with water?

Why it has an auger? The others suggest already other solutions

Have you the opportunity to redesign the feeding/conveying starting from the truck unloading ?

You should share a drawing in this forum

You might be surprised what brains do for free, just because they like what their are doing

In this way, my regards to all who helps to learn in this forum

Regards from Buenos Aires

bulk.good.solutions.ar@gmail.com ■

I'm not clear, are you setting a design challenge or trying to answer one??? ■

Originally Posted by weitzel

I am trying to spec out a screw conveyor system for 2" wood chips (density of 18.76 lbs/cuft) for a design class of mine. For now, I am only trying to find the diameter, power required, etc. The angle of the conveyor will be determined with information I get from another in my group. I figure that I can get a range of results and pick what will work for our project. Are there general calculations that I can start out with?

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Any 110 ac voltage or gasoline engine powered 6 inch grain auger will work why waste your time!!!!!!

As far as the angle goes its a non issue as flighting will carry it anywhere and anyway!!

the secret which is no secret is the angle of the flighting for the auger, the steeper the angle the more material can be moved at a slower rate the narrower the flighting the smaller the amount no matter the speed. UUUUUGGGGHHHHHH!!!!!!!!

Everybody including these so called instructors who run out of relevent material to use should tell you people about Archimedes and the "screw" if they expect you people to learn anything before hand!!!!!!!!!!

If you really want to see something look up water screws used to elevate water in water treatment plants from river water wet wells!!!!

lzaharis ■

A pneumatic delivery system is even more effcient with low power requirements used to vacuum fill a conical bottom silo and pressure deliver the wood chips.

Dumping a trailer load of chips on a storage floor and vacuuming them up to deliver them to the boiler is easy using a "whirl air" brand or other delivery system for example, by simply dumping the chips in a below ground hopper and then using a small six inch auger to feed the pneumatic delivery hopper eliminates the possibility of fire.

lzaharis ■

You're about to face one of the problems in designing a handling system. 50mm lumps require relatively large machines to handle them, 1 te/hr is a low capacity that under normal circumstances would require only a small machine to handle it.

So are you wanting 1 te/hr continuously from your main store, or say 10 te/hr to a buffer hopper just before the boiler with a 1 te/hr extraction system to the boiler? ■

Originally Posted by weitzel

I am trying to spec out a screw conveyor system for 2" wood chips (density of 18.76 lbs/cuft) for a design class of mine. For now, I am only trying to find the diameter, power required, etc. The angle of the conveyor will be determined with information I get from another in my group. I figure that I can get a range of results and pick what will work for our project. Are there general calculations that I can start out with?

The equations below will give you an approximate idea. For precise sizing you have to take help of the manufacturers.

Capacity, Q = 60*(3.14*D*D/4)*S*N*E*B*C T/hr

Where

D – Screw Dia, m

S – Screw Pitch, m

N – speed in rpm

E – loading efficiency (consider 0.4 for wood)

B – Bulk Density, T/m3

C – factor responsible for inclination = (1.0 to 0.65) for (0 to 20 degree)

Power required, N = (Q*L/367)*(W+SinA) KW

Where

A – angle of inclination

L – length of screw conveyor, m

W – friction factor (consider 2.5) ■