Energy Yield of Black Locust Biomass Fuel
Detailed analysis of 2- to 10-year-old black locust (Robinia pseudoacacia L.) biomass components provided an accurate energy content and energy yield determination as well as an index defining a relative ceiling on the delivered cost for black locust biomass in comparison with other fuels such as coal and forest residues. Total energy content of individual biomass components ranged from 20.97 x 106 J kg-1 for leaf tissue to 19.23 x 106 J kg-1 for current years' growth. Annual total energy yields ranged from 33.75 to 76.79 x 109 J ha-1 yr-1 for 3- and 9-year-old stands, respectively. Nine-year-old stands also exhibited the highest annual net whole-tree and woody biomass (whole-tree less foliage) energy yields of 32.71 and 30.73 x 109 J ha-1 yr-1. The net annual energy yields were consistently greater for whole-tree biomass compared with woody biomass due to the foliage included in the whole-tree biomass. The relative cost indices maintained a high degree of variability between comparison fuels. Bituminous coal and forest residues were lowest with an overall mean cost index for woody biomass of $13.28 mt-1 and $13.72 mt-1, respectively. Woody biomass maintained a greater relative index than whole-tree biomass over all age classes due to its inherently higher conversion efficiency. Forest Sci. 32:1049-1057.
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Document Type: Journal Article
Affiliations: Associate Professor, Department of Forestry, University of Kentucky, Lexington, KY 40546-0073
Publication date: 1986-12-01
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