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This article is not finished yet. It will be completed soon.
We will discuss
- what you do with these curves,
- how you design the SX-pumpers,
- how you can zoom in on the actual full-scale design without worrying about
scale-up rules using CFD,
- how to troubleshoot existing SX-circuits,
- how to know if the upper auxiliary impeller is doing its job,
- how to determine flow restrictions,
- how to optimize the design of the pumper's blades,
- how to know if your vendor met its guarantee obligations,
- how to know if you specified the right parameters for the design,
- how to measure your system head,
- how to make simple changes that will decrease the head requirements of
your system and make your system hydraulically efficient,
- how to reduce the power needed and increase flow rate (production).
Conclusions
 | Scale-up of pumper mixers has been demonstrated using dimensionless
numbers |
| You need to determine H, Q, P on any scale to create your own
head-flow-power curves
|
| This approach takes the guess work out of sizing the pumper mixers |
| Operating conditions are a function of solvent, temperature,
concentrations, residence time and liquid depth and can be studied with the
right physical description |
| Confidence that the CFD will predict actual performance
 | If our CFDs don't do what we say they will, there is no
charge. Our confidence is backed by this guarantee! |
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| Allow Post Mixing to test
or audit current conditions of your existing SX-plant
| See if a CFD-model also predicts your actual flow rate |
| Solicit and test ideas on the computer without plant shutdown and loss
of production to see what is wrong |
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| Design a new pumper impeller
| to provide the head and flow your site was originally designed to
operate at (if you are having troubles achieving them) |
| to provide the head and flow your site would like to have (if you are
planning plant production increases) |
| Of course you know that the blade curvature makes a difference! |
| Did you know that blade height makes a difference? |
| Did you know that the length of these blades make a difference? |
| Did you know that curved bladed pumpers still pump and provide flow if
you spin them backwards? Do you know how it affects your plant
performance? |
| Did you know how sensitive the head and flow is to the clearance
between the bottom of the blades and the false bottom? |
| Did you know that what you do to a pumper directly above the orifice
makes a difference? |
| Did you know that no pumper design is ideal under every circumstance? |
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| Help with other design concepts, such as
| Optimize baffles |
| Optimize orifice size for the intended flow (did you know it makes a
difference?) |
| Optimize the size of inlet and outlet pipes |
| Optimize what's under the false bottom |
| Optimize the overflow - underflow connections or weirs. |
|
| Have Post Mixing write
the specs for the mechanical solution and optimize your SX operation
| Often we can prescribe just replacing the pumper impellers and leave
the same or reduce the speed and motor power. A production increase
can't get any cheaper: No change gears, no new motors, no new
gearboxes. |
| We are aware of bad operational conditions and we will steer you away
from them. |
| We are cognizant that over powering your pump boxes will
induce air from the head space, increase crud formation, increase
entrainment levels by creating droplets that are too fine in size,
increase the level in the pump boxes, and reduce the efficiency of your
settlers. |
| We are cognizant that under powering your pump boxes
will cause premature phase separation, can cause water-lock,
dramatically increase the levels in your pump-boxes, unnecessarily
increase the head demand on your pumpers, reduce overall hydraulic
efficiency, and reduce mass transfer efficiency. |
| We are very aware that the effects of over powering and under
powering are dependent on the pumper design and increasing
power as a brut force method of achieving a design condition is
no substitute for a well designed pumper and pump tank. |
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