718 / 2019-08-29 21:15:26

The Fate of Sulfur Trioxide Through Air Pollution Control Devices in Actual Power Plants Burning High-sulfur Coal

air pollution control devices,ultra-low emission,SO3,high-sulfur content coal,corona suppression

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The environmental issue caused by sulfur trioxide (SO3) pollution from coal-fired power plants has attracted worldwide attention. In this study, the synergistic removal of SO3 through air pollution control devices in ultra-low emission power plants burning high-sulfur coal were investigated. The continuous SO3 concentration obtained by a quick-response SO3 monitor and the on-line operation data were combined for the analysis. Results showed that the synergistic removal of SO3 through the existing air pollution control devices in coal-fired power plants was of great importance to meet the SO3 emission standard at the stack. The utilization of low-vanadium catalyst can reduce the conversion rate from SO2 to SO3 to as low as 0.366%. There was a direct correlation between the SO3 concentration and flue gas temperature across electrostatic precipitator (ESP), and reducing gas temperature helped to promote the simultaneous SO3 removal efficiency by the ESP. To further eliminate the SO3 emission, wet electrostatic precipitator (WESP) is installed after the wet flue desulfurization. However, the SO3 removal efficiency was only 63.93% due to the corona suppression caused by high-sulfur coal. The research findings provide a deep understanding to eliminate the SO3 emission from power plants burning high-sulfur coal.