Manufacturing Process Of Biomass Briquetting

Fuel briquette is black / brown in colour.. When agro-waste of cellular nature is briquetted, it produces low cost, high calorific value fuel which can from a good substitute for wood and coal. This implies conversion of waste into a useful energy source. The end product has the following typical proximate analysis :-  

i. Waste materials are tested for their chemical composition to decide on their suitability and to select a proper mix.
ii. Dried Biomass material containing approximately. 10 - 15 % moisture is suitable for briquetting. However if material has higher moisture content it needs to be dried (through dryer or sun dry) before use.
iii. Material is screened, chopped and ground to get the desired size and bulk density and is pneumatically transported into storage bins. This helps in separation of the heavier and metallic particles and also unifying moisture content in the material. Air used is hot or wet as the case may be, for control of moisture. ln this process the cellulose bonding in biomass collapses due to application of high pressure (1200 kg/, and temperature (200 o C) & more thereby fluidizing the lignin.
iv. The moisture content in the material should be lesser than 12% for best results during compaction. Material from bin is discharged to the machine through regulated conveyors where it is compressed in specially designed dies. The compression raises the temperature of the material, softening some of the inherent binders in it, which come to the surface and bind the material together.
v. Briquettes formed are in the shape of logs or pellets, which are forced through tracks for proper shaping, by cooling them under pressure.
vi. Cooled briquettes are cut and packed in bags or stored in bulk for shipment or use.
vii. No Binder is required in the process.