The effects of different gasification temperature and gas-solid ratio (S/B) on steam gasification reaction of waste pine sawdust were investigated in the self-made steam gasifier by using high-temperature steam gasification technology. Fourier transform infrared spectroscopy (FT-IR) and XRD ray diffraction were employed to analyze the reaction residue and the gasification tar

respectively. The specific surface area and pore characteristics of the reaction residue were separately measured by BET multi-point method and BJH method. The results showed that the increase of steam flow promoted the reactions of steam reforming

carbon reduction

and carbon monoxide conversion. When the ratio of S/B increased from 0.5 to 1.5

the volume fraction of H2 increased from 52.32% to 67.3% at 900℃

the volume fraction of CO decreased with increasing temperature

and then slightly increased

while the change rule of CO2 was opposite to CO. The volume fraction of hydrocarbon gases (CH4 and CnHm (n≥2)) of small molecule decreased gradually. In the temperature range of 750-950℃

the gasification reaction increased with increasing temperature. When S/B was 1

the volume fraction of H2 increased from 31.91% at 750℃ to 62.89% at 900℃

increasing by nearly one time. With the increase of temperature

the weight loss rate of pine briquette fuel increased from 82.91% to 91.27%

the pore structure of the residual solid phase was fully developed

and the average pore diameter decreased from 20.96 nm to 3.76 nm. The content of aliphatic hydrocarbons in gasification tar also increased with increasing temperature

while the content of aromatic hydrocarbon decreased due to the ring opening reaction

which was beneficial to reduce the tar content in the gasification gas.