A CFD Study on Flow Control of Ammonia Injection for Denitrification Processes of SCR Systems in Coal-Fired Power Plants

Min-Gyu Kim, Deok-Cheol Seo and Hee-Taeg Chung
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Min-Gyu Kim: School of Mechanical Engineering, Gyeongsang National University, 501, Jinju-daero, Jinju, Gyeongnam 52828, Korea
Deok-Cheol Seo: Korea South-East Power Company, 123-32, Sadeul-ro, Jinju, Gyeongnam 52852, Korea
Hee-Taeg Chung: School of Mechanical Engineering, Gyeongsang National University, 501, Jinju-daero, Jinju, Gyeongnam 52828, Korea

Energies, 2021, vol. 14, issue 5, 1-15

Abstract: The selective catalytic reduction method is a useful method for the denitrification process of exhaust gas emitted from industrial facilities. The distribution of the ammonia–nitrogen oxide mixing ratio at the inlet of the catalyst layers is important in the denitrification process. In this study, a computational analysis technique was used to improve the uniformity of the NH 3 /NO molar ratio by controlling the flow rate of the ammonia injection nozzle according to the flow distribution of nitrogen oxides in the inlet exhaust gas of the denitrification facility. The application model was simplified to the two-dimensional array adopted from the existing selective catalytic reduction (SCR) process in the large-scaled coal-fired power plant. As the inlet conditions, four (4) types of flow pattern were simulated, i.e., parabolic, upper-skewed, lower-skewed, and random. The flow rate of the eight (8) nozzles installed in the ammonia injection grid was controlled by Design Xplorer as the optimization tool. In order to solve the two-dimensional steady, incompressible, and viscous flow fields, the commercial software named ANSYS Fluent was used with the κ-ε turbulence model. The root mean square of NH 3 /NO molar ratio at the inlet of the catalyst layer has been improved from 84.6% to 90.1% by controlling the flow rate of the ammonia injection nozzles. From the present numerical simulation, the operation guide could be drawn for the ammonia injection nozzles in SCR DeNO x facilities.

Keywords: denitrification; ammonia injection; numerical analysis; molar ratio; flow control; ammonia injection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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