The physical properties (enthalpy and thermal conductivity) of mahogany wood induced by pyrolysis temperature process

The recent work found the physical properties that greatly affected the transport phenomena; enthalpy values and thermal conductivity values in the pyrolysis process. In the previous work, it was assumed as constant variable. Meanwhile, there were a dependence between the variables and the pyrolysis temperature. Then, it would be calculated both physical properties by using bomb calorimeter and thermal conductivity testing apparatus. In the experimental runs, biomass was shaped in the form of needle particles about 1 μm and run 3 hours to produce char and tar yields. It was carried out at a temperature setting from 250°C to 800°C. To support analysis of the thermal conductivity values, the char yields were visualized by using direct photograph and SEM by 3000 times magnification to investigate the char quality based on the color and the structure of char material imaging their porrosities. The results showed that the enthalpy values of char increased with the increasing of pyrolysis temperatures, however, the enthalpy values of tar inclined up to temperature of 500°C. Afterward, it decreased for the reason that the biomass was decomposed gas products in secondary reaction. Another result presented the thermal conductivity increased up to 500°C then it reached almost constant values. The increasing of the thermal conductivity values due to carbon and porosity of char.