GEK Wiki / Biomass Fuels: Their Characteristics and Preparations
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Biomass Fuels: Their Characteristics and Preparations

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Saved by jim mason
on November 6, 2009 at 6:32:50 pm

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Characterizing Biomass

Biomass Proximate and Ultimate Analysis Composition for Common Biomass Types



Run Issues and Experience with Specific Fuels

Wood pellets as downdraft gasifier fuel

BioPlugs: Large pellets with plastic binder 



Fuel Preparation Techniques and Machines

Chippers, chunkers, loppers, splitters, shredders, disintegrators, etc


Chunkers (or ways to get a Laimet chunker for less than $50,000)


Wayne Keith's truck axle circle shear


Jussi Äystö circle shear


Indian slow shear chunker video


Ed Burton's Spiral Shear




Greg Manning in Canada has built the most impressive DIY wood chipper and sorter i've seen to date.  Here's his photoset on the woodgas forum which shows the set up.


Greg's set up is based on the common low cost chinese disk chipper, and a rotating mesh cylinder to size separate the resulting chips.  These chinese disk chippers are available for around $1200 new and are commonly driven off tractor pto's or 20hp and above engines.  A disk chipper will produce a more chunky chip than a drum chipper.  Drum chipper make long slice chips which will not work in a downdraft.  I do not know yet if the common garden scale disk chippers, like the Troybuilt chippers will produce a chip of adequate size.  I know the chinese disk chippers will.



Redneck Log Splitter


Cone splitters


V-8 Chain saw



Growing and Using Biomass: Argiculture, Silviculture, and Integrated Agro-energy Systems

Biomass Yields

Grasslands and Praries:

Energy yields from biodiverse plantings are higher than from monocropped biomass energy. Other benefits, such as wildlife value may also be higher.

Graph showing Net Energy Balance of Different Biomass Energy Production Systems



Tillman, D., Jason, H., & Lehman, C. (2006). Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass. Science, 314, 1598-1600. Retrieved June 30, 2008, from


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