Production of high quality feedstocks through comminution
Waste to Wisdom conducted one of several experiments to produce high quality feedstock through comminution (chipping and grinding) in September 2014. This experiment studied how different types of residual woody biomass material behaved when processed with a commercial chipper. The goal was to produce high quality biomass material, or feedstock, that is consistent in size and low in contamination (bark and dirt).
In addition, the study focused on producing quality feedstock that’s suitable for use with biomass conversion technologies such as gasification, pyrolysis, and densification. These technologies turn woody biomass into a more energy dense material.
* Biomass + gasification = biochar
* Biomass + pyrolysis + pelletization = torrefied pellets
* Biomass + densification = briquettes
Five different material types were produced for the study: processed (delimbed stem wood only) hardwood and softwood tree tops, unprocessed (limbs and needles still intact) hardwood and softwood tree tops , and slash (chunks, limbs, and needles). The output from each material type was evaluated for particle-size distribution, bulk density, moisture content, and ash content.
Humboldt State University led the experiment along with several project partners — Oregon State University College of Forestry, Peterson Pacific Corporation, Steve Morris Logging, and Green Diamond Resource Company.
(Click on the upper left image below to go to slideshow view with full captions for each image.)