Abstract
The acquisition of calorific values and CHN/O analysis have been performed for 10 locally available biomass samples (Delonix regia, Azadirachta indica, Ficus lepidosa, Dalbargia sissoo, Psidium guajava, Zizyphus mauritiana, Artocarpus heterophyllus, Moringa oleifera, and Polyalthia longifolia) and Bambusa tulda. Elemental analysis (CHN/O) of a biomass gives rise to estimation of its empirical biochemical formula. On the basis of average calorific values, oxygen and hydrogen contents in chemical formula against unit carbon atom of these biomass samples, the best biofuel was examined for gasification in a 10 kWthermal laboratory based down draft gasifier. It was observed that Psidium guajava had the highest calorific value (18.403 MJ kg–1), followed by Bambusa tulda (18.401 MJ kg–1), and the least was for Ficus lepidosa (15.952 MJ kg–1). These calorific values were obtained with an automatic bomb calorimeter. Against one atom of carbon, Bambusa tulda has minimum 0.599 fractions of oxygen atoms and 1.684 hydrogen atoms. The corresponding values for Psidium guajava is 0.608 (oxygen) and 1.752 (hydrogen). However, Delonix regia has highest hydrogen (1.866) contents. Nitrogen contents for all the samples are of course very small. Psidium gujava, Bambusa tulda, and Dalbargia sissoo were gasified in a 10 kW thermal downdraft gasifier; the producer gas thus generated had calorific values (4.6, 4.55, 4.50) MJ/Nm–3 as measured with a Junker Gas Calorimeter.
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