Investigation of Slagging Condition in a Zhundong Coal-Fired Boiler via In Situ Optical Measurement of Gaseous Sodium. - Li Guo; Haofan Wang; Xian Li; Xiangxi Wang; Nanxi Bie; Bin Yao; Weijun Zhen; Jian Li; Chun Lou; Hong Yao (Sensors, 2024)