Mechanical Properties of Hemp (Cannabis Sativa) Biomass

Andris Kronbergs, Elgars Širaks, Aleksandrs Adamovičs, Ēriks Kronbergs

Abstract


In Latvia approximately of 14.6% of unfarmed agricultural land can be used for herbaceous energy crop growing. Herbaceous energy crops would be as the main basis for solid biofuel production in agricultural ecosystem in future. Herbaceous energy crops as hemp (Cannabis sativa) are grown in recent years and can be used for solid biofuel production. Experimentally stated hemp stalk material ultimate tensile strength the medium value is 85 ± 9 N mm-2. The main conditioning operation before preparation of herbaceous biomass compositions for solid biofuel production is shredding. Therefore hemp stalks were used for cutting experiments. Cutting using different types of knives mechanisms had been investigated. Specific shear cutting energy for hemp samples were within 0.02 – 0.04 J mm-2. Hemp stalk material density was determined using AutoCAD software for cross-section area calculation. Density values are 325 ± 18 kg m-3 for hemp stalks. Specific cutting energy per mass unit was calculated on basis of experimentally estimated values of cutting energy and density.

Keywords


energy crops; hemp; mechanical properties

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References


Directive 2009/28/EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC (Text with EEA relevance).http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32009L0028:EN:NOT, (Accessed on 30.03.2010).

Land politics statement for years 2008. – 2014. The Order of the Cabinet of Ministers of the Republic of Latvia Nr. 613 (in Latvian), http://www.mk.gov.lv, (Accessed on 30.03.2010).

Srivastava AK, Goering CE, Rohrbach RP. Engineering principles of agricultural machines. ASAE Textbook Number 6. Pamela De Vore-Hansen, Editor, Books&Journals. 1993. p. 601.




DOI: http://dx.doi.org/10.17770/etr2011vol1.901

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