Characterization and Combustion Analysis of Densified Fuel Briquettes Made from Bio-Waste Materials

In this study, fallen leaves of Azadirachta indica and Prunus dulcis were treated as waste

materials for the production of energy-intensive bio-coal briquettes. The physical com-
position revealed that the moisture content ranged from 6.8% to 8.8%, fixed carbon from

10.7% to 14.0%, volatile matter from 71.2% to 77.1%, and ash content from 4.1% to 7.6%.
The chemical structure of the biomass fuel, which included carbon, hydrogen, nitrogen,
sulfur, and oxygen, was noted to be 44.56–50.69%, 7.12–7.33%, 0.14–0.25%, 0.47–0.79%, and
41.08–47.46%, respectively. The higher heating value ranged from 16.8 to 18.3 MJ/kg. With
increasing pressure from 5 to 20 MPa, briquette density increased from 654 to 995 kg/m3
,

shatter index from 81% to 94%, durability from 67% to 92%, and resistance to water pen-
etration from 57% to 77%. A low-pressure briquette (5 MPa) burned at a higher rate of

8.0 g/min, whereas a high-pressure briquette (20 MPa) burned at a lower rate of 2.5 g/min.
All leaf types tested were able to boil 1000 mL of water with 100 g of briquettes in just
7 min.