Thermogravimetric analysis on co-gasification characteristics of pine sawdust and lignite was carried out.The migration behavior of alkali metal elements Na and K during the co-gasification were investigated by using atomic absorption spectrometry.The results show that

the pine sawdust can improve the reactivity of coke gasification stage.In other words

the mixed sample produced a synergistic effect at that stage.As the gasification temperature increases

the alkali metal release during coke gasification stage increases steadily.The alkali metal content of raw materials was high and more active

and in the gasification process it was easy to release to the gas phase.The co-gasification process can inhibit the release of alkali metal to the gas phase.The inhibition tends to increase with the increasing gasification temperature.