Deflector device optimization for controlling nitrogen oxide emissions and pressure drop in selective catalytic reduction denitrification system

ABSTRACT

Selective catalytic reduction technology effectively controls nitrogen oxide emissions from coal-fired power plants. In denitrification systems, exceeding nitrogen oxide emissions and excessive local pressure drop are common issues. Numerical simulation methods are used in this study to optimize the flow field to enhance denitrification efficiency and reduce pollutant emissions. Specifically, four deflector plate schemes for the variable-section flue duct segment are proposed. In actual retrofitting, the optimization scheme led to a reduction in nitrogen oxide emissions from 97.3 mg/Nm³ to 48.6 mg/Nm³ and an increase in the outlet pressure of the denitrification system from −3000 Pa to −2959 Pa, resulting in a 41 Pa decrease in local pressure drop. This optimization will further reduce pollutant emissions from power plants and the power consumption of induced draft fans.

KEYWORDS:

• Deflector plate
• nitrogen oxide emissions
• pressure drop
• variable-section flue duct segment
• selective catalytic reduction

Nomenclature

SCR	=	Selective catalytic reduction
SNCR	=	Selective non-catalytic reduction
CN	=	Chinese patent
CFD	=	Computational fluid dynamics
NH3	=	Ammonia
NOx	=	Nitrogen oxides
O2	=	Oxygen
H2O	=	Water
CO2	=	Carbon dioxide
N2	=	Nitrogen

Acknowledgements

We appreciate the support from the School of Mechanical and Power Engineering at Zhengzhou University in this work.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplemental material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/15567036.2024.2382912.

Notes

1. Contact Shuangquan Wang [email protected] School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, Henan, China.

Additional information

Notes on contributors

Shuangquan Wang

Shuangquan Wang is a graduate student at the School of Mechanical and Power Engineering, Zhengzhou University. His areas of interest include fluid simulation in the flues of coal-fired power plants using computational fluid dynamics.

Kai Li

Kai Li is a senior engineer at Henan Power Limited Company, working in the Boiler Environmental Protection Department. His areas of interest include studying boiler flue gas pollutants such as NOx, SO2, and NH3.