Effects of water vapor addition on NO reduction of n-decane/air flames

ABSTRACT

NO producing mechanism and effects of additional water vapor on NO reduction of n-decane/air flames were examined numerically in the present study. A new phenomenon was found that the variation trend of contribution of chemical effect of water vapor on NO reduction with pressure changes with the equivalence ratio. To illustrate this, NO emissions without and with water vapor addition were examined. Results showed that the new phenomenon is because that NO-producing pathways vary with both equivalence ratio and pressure, and hence the reactions through which the added water vapor influences NO production also vary with equivalence ratio and pressure.

KEYWORDS:

• NO reduction
• NO emission
• water vapor addition
• clean combustion
• equivalence ratio

Additional information

Funding

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 61327011, 61620106004 and 61522102), the Cheung Kong Scholars Program of China and the Innovative Research Team in University (IRT1203).

Notes on contributors

Liuyong Chang

Liuyong Chang was born in Shanxi, China, on 1990. He received the B.Sc. degree in thermal energy and power engineering from China University of Mining and Technology, China, in 2014. He is now a Ph.D. student in Beihang University. He is now studing on research topic related to combustion mechanism and combustion instability.

Yuzhen Lin

Yuzhen Lin received the B. Sc., M.Eng., and Ph.D. degrees in thermal power engineering from Beihang University, Beijing, China, in 1991, 1994, and 1997, respectively. He is currently a professor with the School of Energy and Power Engineering, Beihang University, Beijing, China. His interests include low-pollution combustion, and swirling combustion.

Zhang Cao

Zhang Cao received the B.Sc. degree (with distinction) in automation and the M.Eng. and Ph.D. degrees (with distinctions) in measurement technology and automatic devices from Tianjin University, Tianjin, China, in 2003, 2005, and 2008. He is currently a professor with the School of Instrumentation Science and Opto-Electronic Engineering, Beihang University, Beijing, China. His interests include process tomography, multiphase flow measurement, and inverse problems.

Lijun Xu

Lijun Xu (M’04–SM’04) received the B.Sc., M.Eng., and Ph.D. degrees in electrical engineering and instrumentation from Tianjin University, Tianjin, China, in 1990, 1993, and 1996, respectively. He is currently a Professor with the School of Instrument Science and Opto-Electronic Engineering, Beihang University, Beijing, China. He has authored or coauthored more than 260 publications. His current research interests include tomographic imaging, scanning imaging and dynamic process monitoring. He won the National Science Fund for Distinguished Young Scholars, the Ministry of Education Technology Invention Award (1st class) and China Instrument Society Science and Technology Award (1st class) in 2012, 2012 and 2014, respectively. He was elected as a Chang-Jiang Scholars Program Professor by the Ministry of Education, Ministry of Organisation, China, in 2014.