Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen (2020)
combustor fueled with premixed ammonia/oxygen using three-dimensional numerical simulations. For this, a three-dimensional model is developed with a detailed chemical kinetic mechanism. The effects of 1) the presence/ absence of the bluff-body, 2) its dimensionless height h and 3) its dimensionless axial location l are examined. It is found that the implementation of a bluff-body can significantly affects the thermal and NO emission characteristics. Up to 39.1 % reduction of NO formation and 41.6 K increase in the outer wall temperature (OWT) can be achieved as the bluff-body is optimized, when compared to the case in the absence of the bluff-body. Furthermore, increasing h leads to OWT being increased, but it can suppress the NO generation in some cases. In addition, increasing l is shown to be involved with a high OWT and a low NO concentration, mainly due to the variation in the flow field and thus heat transfer characteristics. Finally, the dimensionless pressure loss is strongly affected by the NH3 flow rate, and the dimensionless parameters h and l. This work reveals that implementing a proper designed bluff-body is an effective way to enhance thermal performance and reduce NOx emission.
CitationCai T, Zhao D, Jiaqiang E (2020). Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen. Chemical Engineering and Processing - Process Intensification. Volume 153, July 2020, 107979
This citation is automatically generated and may be unreliable. Use as a guide only.
KeywordsNOx emission; Ammonia; Bluff-body; Micro-combustion; Thermal performance; Dimensionless pressure loss
ANZSRC Fields of Research40 - Engineering::4004 - Chemical engineering::400402 - Chemical and thermal processes in energy and combustion
RightsAll rights reserved unless otherwise stated
Showing items related by title, author, creator and subject.
NOx emission and thermal performances studies on premixed ammonia-oxygen combustion in a CO2-free micro-planar combustor Zhao D; Cai T; Wang B; Li J; Guan, Y (2020)Unlike hydrocarbon fuel, ammonia is a carbon-free and renewable energy source. It is also regarded as one of the potential energy carriers. However, ammonia combustion for power generation is not well studied under ...
Nox emission performance assessment on a perforated plate-implemented premixed ammonia-oxygen micro-combustion system Zhao D; Cai T; Becker S; Wang B; tang A; Fu J; Han L; Sun Y; Cao F (2020)The present work examines the NOx emission characteristics of a premixed micro-combustion system with a perforated plate implemented. For this, a three-dimensional (3D) computational model involving a detailed chemical-kinetic ...
Effect analysis on energy conversion enhancement and NOx emission reduction of ammonia/hydrogen fuelled wavy micro-combustor for micro-thermophotovoltaic application Zhao D; Han L; Li J; Xi, Yunzhi; Gu, Xingpeng; Wang, Ningfei (2021)