The Analysis of Influence of the Gangue in the Coal as Fired on the Coal Conveying System and the Boiler Operation of the Circulating Fluidized Bed UnitSu Pan, Yu Pengfeng, Linbo Liu, Han Jing and Xiao ShenE3S Web Conf., 118 (2019) 02011DOI: https://doi.org/10.1051/e3sconf/201911802011