The whole process test and analysis of flue gas SO 3 in coal-fired power plant under variable load conditions

作者：Zhigang Hong, Quankai Huang, Wei Chen, Yongsheng Liu · 发表于：IOP Conference Series Earth and Environmental Science · 年份：2020 · DOI：10.1088/1755-1315/569/1/012066 · 被引用次数：3 · 研究领域：Industrial Gas Emission Control、Gas Sensing Nanomaterials and Sensors、Aerosol Filtration and Electrostatic Precipitation

Abstract Under the current situation of ultra-low emission, it is of great significance to study the formation and removal of SO 3 in various equipments of coal-fired power plants. At present, most researches on SO 3 in coal-fired power plant focus on the influence of single equipment on flue gas SO 3 under a certain load condition. In this research, a 300MW generating unit is tested under variable load conditions to explore the variation law of SO 3 in various equipments under variable load conditions. The results show that SO 3 is mainly generated in the boiler furnace and SCR denitrification device, and the total removal rate of SO 3 is 84.6%. However, the removal efficiency of SO 3 in electrostatic precipitators and the wet desulfurization systems shows great differences. Under full load condition, the removal rate of SO 3 is 46.8% - 69.8%. When the load changes, the SO 3 removal rate changes with the change of load, and the ESP is affected by the load most. The SO 3 content in the ash increases from 11.267mg/g under 50% load to 14.763mg/g under 100% load, and such changes are mainly determined by flue gas temperature and flue gas flow.