Design and evaluation of novel static mixers for SCR application

Abstract

AbstractStatic mixers are widely used in selective catalytic reduction (SCR) systems to improve the conversion efficiency and service life of the catalyst by better mixing ammonia and the exhaust stream. However, the structure of the mixer needs to be designed carefully to minimise the loss of the system pressure caused by its installation. In this work, experiments and simulations are conducted to evaluate the mixing performance of the static mixers and the system pressure loss. The simulations and experimental results have good agreement. Four novel static mixers are designed and compared with a commercial static mixer to demonstrate their performance. The results show that the box mixer can accomplish less pressure loss (690 Pa) and more homogenous mixing (CoV = 5.4%), and it can thus be used to improve the mixing of ammonia and the exhaust stream in SCR systems.KEYWORDS: Static mixerSCRmixingevaluationCFD Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by National Key Research and Development Program of China: [Grant Number 2022YFE0124300; 2022YFB3504104].Notes on contributorsYouhong XiaoYouhong Xiao, born in 1978, Ph.D. in Naval Architecture and Marine Engineering from University of Strathclyde in 2009. He has been a Professor in Department of Power and Energy Engineering, Harbin Engineering University since 2018. His research interests include the vibration noise control of power units, noise source identification technology, diesel engine emission purification, and muffling integrated control technology.Hui ZhaoHui Zhao is a Ph.D. candidate in the college of Power and Energy Engineering, Harbin Engineering University. He received the bachelor degree in marine engineering from the School of NAOCE, Shanghai Jiao Tong University, Shanghai, China, in 2015 . His current research interests include exhaust emission control of marine diesel engine.Xinna TianXinna Tian, born in 1987, Ph.D. in Naval Architecture, Ocean and Marine Engineering from University of Strathclyde in 2016. She has been a Senior Engineer in China Shipbuilding Power Engineering Co., Ltd., Shanghai, since 2018. Her research interests include marine diesel NOx reduction, marine ship Carbon dioxide capture.Tao SunTao Sun, born in 1978, Ph.D. in Marine Engineering from Harbin Engineering University in July 2005. His Research Interests including simulation and test of aerodynamic performance of compressor, heat transfer and cooling technology of turbomachinery, performance of the intake and exhaust system of the power unit, aerothermodynamics of turbomachinery and multiphysics coupling simulation of fluid machinery.