Open AccessThe whole process test and analysis of flue gas SO3 in coal-fired power plant under variable load conditions
Author(s) -
Hong Zhang,
Quankai Huang,
Wei Chen,
Yongsheng Liu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/569/1/012066
Subject(s) - flue gas , boiler (water heating) , coal , power station , environmental science , flue gas desulfurization , load following power plant , waste management , power (physics) , base load power plant , engineering , electricity generation , electrical engineering , thermodynamics , physics
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.