Thermogravimetric Analysis of Blended Fuel of Pig Manure, Straw, and Coal

This study investigated the combustion performance of pig manure, straw, and coal at various blending ratios using thermogravimetric analysis. The synergistic effect of coal and pig manure at various ratios was analyzed, and kinetic analysis was performed using the Coats–Redfern method. The results showed that the overall combustion performance and stability of the blended fuel improved as the blending ratio of pig manure and straw increased. Increasing the ratio of pig manure reduced the ignition temperature of blended fuel from 696 K to 675 K. Additionally, the combustion of pig manure and coal exhibited a significant synergistic effect, strongest at a 5% blending ratio. For combustion reactions with conversion rates between 0.2 and 0.8, the activation energy required was 75.82 kJ mol−1 for a 10% pig manure blending ratio and 44.33 kJ mol⁻1 for a 30% blending ratio. These results demonstrate that lower activation energies suggest that the combustion reaction is more likely to proceed. The activation energy of straw was higher than that of pig manure at all blending ratios. These findings suggest that pig manure burns more easily when blended with coal than straw.