Study on SO3 Cooperative Removal Effect of Ultra-low Emission Technology in Coal-fired Power PlantsDing Yang, Yi Luo, XingLian Ye, WeiXiang Chen, Jun Guo, ZongShu Zou and FengHua LuE3S Web Conf., 53 (2018) 04005DOI: https://doi.org/10.1051/e3sconf/20185304005