Mineral Matter Transformation of Coal Ash under Gasification Atmosphere: A Case of Huolinhe Lignite
Experiments have been conducted with Huolinhe lignite low temperature ashes (HLH-LTA) to investigate the mineral behaviors under gasification atmosphere (H2/CO2=1:1, volume ratio) with the temperature increase by SEM and XRD. The results show that the contents of SO3 and alkali metal oxide (e.g. K2O, Na2O) are higher in the HLH-LTA than that in laboratory HLH ashes. The formation of some low-melting ferrous eutectic compounds causes the initial melting temperature of HLH-LTA is lower about 300 °C than its deformation temperature. The formation of slag during HLH fluidized-bed gasification is the results of the interaction among minerals and phase changes with the temperature increases under reducing atmosphere.
Weiguo Pan, Jianxing Ren and Yongguang Li
F. H. Li et al., "Mineral Matter Transformation of Coal Ash under Gasification Atmosphere: A Case of Huolinhe Lignite", Advanced Materials Research, Vols. 347-353, pp. 3732-3735, 2012