首页|Experimental study on migration and transformation of selenium species and DFT calculation in WFGD simulated slurry
Experimental study on migration and transformation of selenium species and DFT calculation in WFGD simulated slurry
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NSTL
Elsevier
? 2022 The Korean Society of Industrial and Engineering ChemistrySelenium is a harmful trace element emitted during the combustion process of coal-fired power plants. Most of the selenium is enriched in the downstream wet flue gas desulfurization system (WFGD). This study found that S2O82- is the most important factor affecting the oxidation of selenite. In the process of simulating slurry oxidation of selenite to selenate, the presence of S2O82- can increase the oxidation rate of selenate from about 50% to about 80%. At the same time, this study also considered the influence of selenium concentration, initial pH, SO2 concentration and temperature etc. on the transformation of selenium species. It was believed that the application of ORP to the indication of selenite oxidation status needs further demonstration. Energy Dispersive X-Ray Spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) were used to confirm the migration of selenium in the desulfurization slurry to gypsum. In addition, DFT calculation was performed to obtain theoretical parameters for the adsorption of selenite and selenate by gypsum. The results of this study are helpful to understand the transformation and migration of selenium in the desulfurization system, which provide theoretical support for the realization of selenium in-situ control.
Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University
NSTL
Elsevier
