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sifting bridges out of wood chips


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#1 JayAlchemAPL

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Posted 31 July 2009 - 06:51 AM

We have a great chipper that use to be a part of the Mechabolic project. Will did a nice job in adding a new hydraulic reservoir to it. Hey good job! Its so much better than the old one. Now that it has been repaired, we can crank out some nice wood chips.
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We chipped up enough pallets to fill two bins with nice wood chunks, however I still like to go through and sift out the bridges and small particles for consistency.
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I'm shooting for .25-1.5 inches for the particle size distribution.
The first screen is to separate the larger chunks and the long splinters.
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In order to keep the splinters from falling through, a quick popping motion on the vertical axis will keep them from rotating and falling through the cracks.
It is important to separate these longer splinters because they will bridge in the reactor typically over the reduction cone.
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A second screen is used to separate the smaller particulates.
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The smaller particulates tend to pack down and will require a greater pressure drop across the gasifier, and possibly even a smaller nozzle size to penetrate the bed of the combustion zone. Even though there doesn't seem to be a significant amount of smaller particulates in this batch of chipped biomass, it is always important to note the particle size distribution and packing tendencies when characterizing biomass.

#2 PresentTeck

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Posted 27 October 2009 - 06:38 PM

i have a much less time consuming idea for you, what if you just put the product of the big chipper through a common house hold chipper thats small and only spits out small chips.   (unless that would make the small chips too small)

EDIT: wate, nevermind




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