This type of hopper is used to store biomass that has been dried. Biomass will absorb moisture if exposed to it, which can result in a loss of energy. This type of hopper is enclosed and are generally a funnel shape to discourage fuel build up on the walls. Smaller particles continue through the hopper while larger particles stuck to the sides of the hopper creating a "rat hole" affect and prevent the hopper from completely emptying.
Grass Pellet Plant Making Biomass Fuel Pellets
1. "Biomass Handling." Biomass Handling RSS. N.p., n.d. Web. 24 Dec. 2012. <http://www.advancedbiomass.com/2010/05/biomass-handling-system-design-–-things-to-consider/>.
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