An Investigation of Selective Catalytic Reduction Catalyst SO_2/SO_3 Conversion in Coal-fired Power Plants

The SO_2/SO_3 conversion in the selective catalytic reduction (SCR) denitrification system of coal-fired power plants plays a significant role in the generation of SO_3. Effectively controlling the conversion rate of SO_2/SO_3 in the denitrification catalyst can substantially mitigate the hazards associated with SO_3. Drawing on 170 SCR catalyst tests, the impact of various factors, including the catalyst's V_2O_5 content, WO_3/MoO_3 content, inlet SO_2 concentration, inlet flue gas temperature, and area velocity, on the SO_2/SO_3 conversion was systematically investigated. The findings suggest potential optimization opportunities for the SO_2/SO_3 conversion rate in the denitrification catalysts currently used in engineering applications. By understanding the influence patterns of key factors, tailored measures such as selecting appropriate performance indicators, designing catalysts for specific projects, and adjusting key operational parameters in coal-fired power plants can be implemented. These measures are aimed at preventing problems like corrosion and blockage in downstream facilities due to SO_3 and effectively controlling SO_3 emissions.