Abstract
The evolution characteristics of degradation gas from highly densified biomass briquette called Bio-coke (BIC) are experimentally and numerically investigated. In the present study, evolution rates of both volatile and water from the BIC sample are determined by Arrhenius equations and the constants such as frequency factors and activation energies are given by the experimental results of thermo-gravimetric analysis. It is confirmed that the analysis model used in the study can qualitatively describe the gas evolution from the BIC sample. Rapid increase in the gas evolution rate is identified when the BIC sample ( 0 20 mm x 10 mm) is heated at an end face of the sample. This can be attributed to the finite volume of the BIC sample; the rapid temperature increase can be observed after the water in the sample is completely released. The volatile/water ratio in the evolution gas takes constant value at heat flux higher than 50 kW/m2 while the ratio gradually increases with time at the low heat flux case (25 kW/m2).
