Energetics of coal substitution by briquettes of agricultural residues

The suitability of using biomass briquettes to substitute coal is debatable, as a substantial amount of energy is required for briquetting of biomass. In the present work, an attempt to evaluate the energetic viability of briquetting of agricultural residues compared with the energy embodied in coal in India has been made. Briquetting of agricultural residues is not found to be an energetically viable option even for locations at a distance of about 1500 km from the coal pithead (even if the briquetting unit is located very close to the place of availability of the agricultural residues). A need for transportation of agricultural residues further pushes this critical distance upwards.