Char formation and gas products of woody biomass pyrolysis

In the biomass power generation, the analysis of pyrolysis products for alternative fuel is very important. In pyrolysis, we have conducted experimentally about char formation and gas products of woody biomass in slow pyrolysis. In the investigation of char formation, a packed bed of biomass particles undergoing pyrolysis has been two-dimensionally visualized. For char formation investigation, the setting temperature of the furnace was changed from 523 K to 1073 K and for gas product investigation, the setting temperatures were carried out from 673 K to 1073 K. The heating rate of the furnace was 400 K/hr. From the experimental results, it was found that the char formation process was closely connected with the pyrolysis and divided three regions; i) region of dehydration from biomass, ii) region of pyrolysis of cellulose and iii) region of pyrolysis of lignin. It was found that the char formation process of the biomass layer through the pyrolysis could be expressed by the reversible first order chemical reaction model. In the gas products, the gas flow rate and gas composition was found to be dependent on the setting temperature. In the high pyrolysis temperature, gas from tar production was decomposed by degradation, mainly, caused by secondary gas phase