Abstract: Steam gasification of sawdust char for the production of hydrogen-rich gas was studied in a high-temperature fixed bed reactor. Experiments were carried out at 700-900℃ with steam flow rate of 0.11-0.32 g/(min·g)(based on the char, the same below).The effects of temperature and steam flow rate on the volume fraction of H₂,gas yield, heat value and compositions were studied. The results showed that the excess steam led to a decrement of the gas heat value. Under the reaction conditions of temperature 900℃ and the steam flow rate was 0.32 g/(min·g), the volume fraction of H₂ reached the maximum(62.53%), the heating value of the fuel gas was 8.99 MJ/Nm³ and the gas yield was 2.75 L/g. And the homogeneous volumetric model and shrinking core model were employed to obtain the corresponding kinetic parameters. The shrinking core model fitted the experimental data better than the homogeneous volumetric model.The acitivity energy and the pre-exponential factor obtained with homogeneous volumetric model were 88.67 kJ/(mol·K)and 2 976.55 min^-1. The activity energy of the shrinking core model was 91.78 kJ/(mol·K)and the corresponding pre-exponential factor was 2 872.82 min^-1.

Key words: sawdust char, steam gasification, H₂, gas yield, heat value, kinetics