Pumping charcoal particulate through a venturi jet pump against back pressure

[jb2900]

I am trying to set up a system where I can dose a charcoal granule into a line using a water-powered eductor system. Problem is that I would be working against an overall back pressure of about 150 PSI.

I'm not an expert on using jet pumps for transporting solids but I have set up an initial test that seemed to work well with a discharge hose that was just open to atmosphere, and pumped at low pressure (probably around 20 psi). This test was just to ensure that the charcoal does not sand out or otherwise clog the jet pump. Now when I hooked it up to a 100 foot line to continue, I get a backup into the vacuum side of the pump, I assume this is due to friction loss and the back pressure.

My question is, will this still work against the back pressure so long as I supply enough discharge pressure from my pump to overcome the back pressure?

I am using a .5in discharge line (100 foot hydraulic hose) which is connected to a jet pump (McMaster 4979K52). Again this was just my initial test set up to try to validate that it can transport the material without clogging, which it seems to do just fine. Discharge line is also smaller than the outlet of the jet pump (1in to .5in) which is also causing loss. I will be using a pressure washer with a 1hp motor and running at about 3 GPM.

Thanks to anyone who may be able to help!

 

[1503-44]

Some slurries do not behave well in pipelines, as they are not usually Newtonian with shear friction varying widely with small changes in velocities.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[EdStainless]

There are lots of very good papers on handling slurries, especially coal and other minerals.
This will be incredibly abrasive. You will likely need to end up having the jet section made from Stellite or ceramic.
The size ratios and driving pressure will need to be adjusted, but in theory it should work.

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P.E. Metallurgy, consulting work welcomed