Development and Evaluation of Coffee Husk Biomass Briquetting Machine

Teka Tesfaye


The result of the direct burning of coffee husks biomass in a conventional manner is very low thermal efficiency and widespread air pollution. When they are made into briquettes, these problems are mitigated, transportation and storage costs are reduced, and energy production by improving their net calorific values per unit is enhanced. Aimed at minimizing the effect of coffee waste constitutes and turning them into an income generation source for the local communities through the development of biomass briquette machines. The experiment used different ratios of carbonized coffee husk and Clay Soil as a binder. The capacity of the machine, Physical and mechanical properties and thermal characteristics of the briquettes were evaluated. Throughput capacity and Degree of Densification of the machine, bulk Density, Resistance to water penetration, Shatter, and Tumbling resistance of the Briquette were increasing with the increase of clay binder ratio with a significant difference at alpha 0.05. The average minimum and maximum throughput capacity and Degree of Densification of the machine were 1.117 and 1.273 kg/min and 290.4 and 308.7%, respectively, at 0 and 25% clay binder ratios. Increasing the clay soil binder ratio increases the percentage of Ash content but decreases the fixed carbon percent and Calorific value. The minimum and maximum Calorific values, Fixed carbon, and Ash content were 3856.89 cal/g, 12.5%, 24%, and 5001.78 cal/g, 30%, and 36%, respectively. Both ignition and water boiling time increase by the increase of clay soil binder ratio with a minimum of 6.5 and 14.3 minutes and a maximum of 7.6 and 18.5 minutes, respectively. It was found that clay was the compatible binding material with coffee husk, where 5% is the optimal possible clay content with an optimal calorific value of 4848.39 Cal/gm and minimum ash content.

Keywords: Briquette, binder, coffee husk, clay soil, and development

DOI: 10.7176/JETP/13-3-02

Publication date:August 31st 2023


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