This research investigated the ratios of the energy consumption during densification process and the gained energy of the briquette fuels having different ratios of glycerin and biomass.
The results showed that the energy consumptions were 1–3% of the energy gained for the domestic-scale solar drying condition, and 12–18% of the energy gained for the industrial-scale condition. In addition, the optimum ratio of glycerin mixed with biomass was 30% by mass.
The obtained results indicated that the mixture of glycerin and biomass was considered feasible to be further developed as an alternative fuel