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Simulation and experimental study of gas-phase diffusion coefficient of selenium dioxide.
- Source :
-
The Science of the total environment [Sci Total Environ] 2024 Oct 15; Vol. 947, pp. 174499. Date of Electronic Publication: 2024 Jul 05. - Publication Year :
- 2024
-
Abstract
- Improving the removal effect of selenium in wet flue gas desulfurization system is a key way to reduce the emission of selenium pollutants from coal-fired power plants. In order to clarify the removal mechanism of selenium pollutants in the desulfurization tower, it is necessary to obtain accurate selenium gas-phase diffusion coefficient. In this paper, molecular dynamics simulations were used to carry out theoretical calculations of gas-phase diffusion coefficients of SeO <subscript>2</subscript> (the main form of selenium in coal combustion flue gas). The gas-phase diffusion coefficients of SeO <subscript>2</subscript> in the range of 393 K-433 K were measured by a self-developed heavy metal gas diffusion coefficient testing device to verify the accuracy of the molecular dynamics calculations. Furthermore, the calculated gas-phase diffusion coefficients of SeO <subscript>2</subscript> under typical binary and ternary components were obtained by correcting on the basis of Fuller's formula. Finally, a single-droplet absorption model for SeO <subscript>2</subscript> was constructed and experiments were carried out to compare the effect of the gas-phase diffusion coefficient on the accuracy of the model calculations. The error of the model calculations was reduced from 8.09 % to 1.96 % after the correction. In this study, the gas-phase diffusion coefficient of SeO <subscript>2</subscript> in the low-temperature range of coal-fired flue gas was obtained. This study can provide basic data for the development of selenium migration mechanism and control technology.<br />Competing Interests: Declaration of competing interest The authors declare no competing financial interest.<br /> (Copyright © 2024. Published by Elsevier B.V.)
Details
- Language :
- English
- ISSN :
- 1879-1026
- Volume :
- 947
- Database :
- MEDLINE
- Journal :
- The Science of the total environment
- Publication Type :
- Academic Journal
- Accession number :
- 38971240
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2024.174499