Effects of inherent alkali and alkaline earth metals and externally loaded Na on production of NH_3 and HCN during the pyrolysis / steam gasification of Shengli lignite

摘要

This work is to investigate the effects of inherent alkali and alkaline earth metals (AAEMs) and externally loaded Na on the production of NLL and HCN during the pyrolysis and steam gasification of Shengli lignite at temperature of 1073K in a fluidized-bed/fixed-bed quartz reactor. The result indicated that the inherent AAEMs promoted the generation of NH_3, while inhibited the formation of HCN during the pyrolysis and steam gasification of Shengli lignite. The effects of externally loaded Na on the formation of NH_3 in the pyrolysis and steam gasification process were different. Specifically, the externally loaded Na inhibited the generation of NH3 in the coal pyrolysis process, while the generation of NH_3 was promoted by the externally loaded Na in the coal steam gasification. Additionally, inhibitory effect of externally loaded Na on the generation of HCN was observed both in the pyrolysis and steam gasification of Shengli lignite.