The coal gasification reactivity in the syngas (H2O

CO2

H2 and CO) was carried out in a fixed-bed tube reactor at atmospheric pressure. The effect of reaction temperature

raw gas composition and coal amount on gaseous products composition and carbon conversion rate was studied. The experimental results indicated that the CO flow rate increased significantly

while H2 flow rate increased a little under the experimental conditions. The reaction between CO2 and coal char was inhibited significantly. The effective gas (CO+H2) concentration of syngas was able to increase through the reaction and its largest increase was 3.3% in the experimental conditions. The inhibition effect of CO and H2 and the competitive effect between H2O and CO2 were obvious. The maximum coal reaction rate in the mixture gas was only 49% and 69% of the maximum coal reaction rate in pure gasification agent (H2O

CO2) in 1100℃ and 1300℃

respectively. The effect of diffusion and adsorption in the pore on the gasification reaction was obvious in the syngas. The random pore model was suitable for the experimental conditions. However

the volumetric reaction model and core shrinking model were poor in fitting of data.