Kinetic analysis of biomass gasification coupled with non-catalytic reforming to syngas production

The clean conversion of biomass gasification tar is one of the bottlenecks affecting the large-scale application of biomass gasification. Non-catalytic reforming of raw gas can convert the tar components to CO and H₂, eliminating the tar while increasing the syngas yield. This paper investigated the kinetic behavior of high-temperature non-catalytic reforming of biomass raw gas on the basis of thermodynamic calculations. The reforming temperature and O₂/crude syngas (O/G) ratio are the key factors affecting the reforming process. C₂H₂ gradually accumulated at the beginning of the reaction as an intermediate product of the conversion of CH₄, C₂H₄ and C₆H₆. Subsequently, C₂H₂ converted to CO, ·CH₂, ·CH₃, and ·C₂H₃ under the attack of ·O, ·OH, and HCO·. Increasing the reforming temperature can significantly reduce the time required for complete tar conversion. At a reforming temperature of 1300 ℃, O/G ratio 0.16 and a residence time of 1.5 s, the dry base content of the syngas was 81.07% and the conversion of the tar reached 99.60%.