Abstract

The energy requirement of Jatropha curcas L. seedcake of different dimensions (4.5, 5.6, 6.7, 8 and 10 mm) for briquette compaction was investigated under compression loading (100, 200, 300 and 400 kN) using the universal compression-testing machine. The parameters measured and/or calculated were the deformation, thickness, numerical energy and theoretical energy. The statistical analysis results show that compression forces had a significant effect (P-value < 0.05) on the amounts of deformation and thickness, while that of the dimensions of the sample did not. The increase in compression forces increased the numerical energy while that of samples dimensions caused a decrease. Using the tangent curve mathematical model; the force coefficient of mechanical behaviour (kN), the deformation coefficient of mechanical behaviour and the fitting curve function exponent were determined for describing the experimental dependency between the force and deformation curves as well as the numerical energies of densified jatropha seedcake briquettes.

Highlights

  • Jatropha curcas L. is a multipurpose perennial oil-bearing plant that belongs to the familyEuphorbiaceae with a life expectancy of 50 years [1,2,3]

  • In the global energy mix, fossil fuels remain the primary energy source that has been associated with the increase of carbon dioxide emissions

  • The use of renewable energy sources such as biomass is essential in reducing greenhouse emissions and fossil fuel dependency [6,7,8]

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Summary

Introduction

Jatropha curcas L. is a multipurpose perennial oil-bearing plant that belongs to the familyEuphorbiaceae with a life expectancy of 50 years [1,2,3]. The production of oil requires de-husking and oil extraction processes [2]. About 50 to 70% of the original seed weight remains as de-oiled seedcake, a by-product after oil extraction. Fruit husk and seedcake have wide-ranging applications as fuel and organic fertilizers or soil conditioners. In the global energy mix, fossil fuels remain the primary energy source that has been associated with the increase of carbon dioxide emissions. The use of renewable energy sources such as biomass is essential in reducing greenhouse emissions and fossil fuel dependency [6,7,8]. Biomass is the third-largest primary energy after coal and oil being the main source of energy for half the world’s population [5,9]

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