Evaluation of the Combustion Characteristics of Rice Husk and Coconut Shell Briquettes

Combustion characteristics of rice husk and coconut shell briquettes have been investigated with a view of establishing its suitability as an energy source. The husk and shell were collected and carbonized in a furnace as rice husk charcoal (RHC) and coconut shell charcoal (CSC). These were further down sized and sieved to 2.5 mm particle size. The RHC and CSC were mixed in proportions of 50:45, 60:35, 70:25, 80:15, and 90:5% by weight respectively, and 5% cassava starch used as binder for all the compositions. The briquette samples were formed by thorough mixing and compaction in a metallic mold and extruded for drying and labelled 1 A, 2 A, 3 A, 4 A and 5 A respectively. Physical and mechanical as well combustion tests were performed to confirmed the viability of the briquettes. The results indicate that sample 1A had the highest calorific value (4886 cal/g). The other properties such as water content, ash content, density of briquettes also indicate their suitability as energy source.