NOx emission reduction reaction of Ammonia-hydrogen with self-sustained pulsating oscillations (2020)
Unlike hydrocarbon fuel, ammonia (NH3) is an alternative but promising carbon-free renewable fuel. The utilization of NH3 as energy resource can effectively reduce greenhouse gas CO2 emission. Here we explore interdisciplinary physics of ammonia-hydrogen-fueled combustion-sustained pulsating oscillations and its impact on NOx emission via numerical simulations. A longitudinal combustor with both ends acoustically open is developed. The premixed flame and constant-temperature heat exchangers are implemented upstream and downstream. With the model validated, it is applied to gain insights on the effects of 1) the mass flow rate of the fuel mixture, 2) the hydrogen mass fraction relative to the fuel mixture, and 3) the temperature TH of the heat exchangers. It is found that nonlinear pulsating oscillations could be generated, depending on Furthermore, the oscillation amplitude and frequency are shown to strongly depend on and . In addition, as is reduced from 45% to 15%, intermittent oscillations with a period of 100 s are observed to superimpose on the acoustic resonance nature of the combustor with a time scale of 10−2 s. Finally, varying temperatures of the heat exchanger are found to affect NOx generation and decrease the amplitude of the pulsating oscillations somehow.
CitationZhao D, Ni S, Wu W (2020). NOx emission reduction reaction of Ammonia-hydrogen with self-sustained pulsating oscillations. Thermal Science and Engineering Progress.
This citation is automatically generated and may be unreliable. Use as a guide only.
KeywordsNOx emission; hydrogen; pulsating oscillations; ammonia
ANZSRC Fields of Research40 - Engineering::4008 - Electrical engineering::400803 - Electrical energy generation (incl. renewables, excl. photovoltaics)
40 - 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.
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)
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 ...
Sun Y; Zhao D (American Institute of Aeronautics and Astronautics, 2020)Self-exited thermoacoustic instability is undesirable in gas turbines and other propulsion systems due to structural vibration, overheating and flame flashback. Such instability is characterized with large-amplitude limit ...