Numerical investigation of ammonia-propane cofiring characteristics utilizing air and hydrogen peroxide as oxidizers

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Ariyan Zare Ghadi , Hankwon Lim
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Abstract

In the present study, we have investigated the impact of introducing different amounts of hydrogen peroxide into the air on the co-combustion behavior of propane and ammonia. Various combustion criteria including flame speed, ignition delay, heat release, NO emission, and reaction pathways have been explored within different compositions of propane/ammonia/air/hydrogen peroxide. This investigation has been performed through the kinetic study applying a detailed mechanism compromising 188 species and 1604 reactions. According to the findings, air replacement by hydrogen peroxide might improve the laminar burning velocity, heat release rate, flame temperature. The substantial reactivity of hydrogen peroxide leads to a significant increase in OH and H radicals, consequently accelerating the reaction rates as the hydrogen peroxide content in the oxidizer increases. The reaction H + O2↔O + OH (R906) plays the most significant role in enhancing flame propagation in a fuel/air mixture. However, as the hydrogen peroxide content in the mixture increases, the influence of this reaction diminishes, and the reaction H2O2(+M)↔2OH(+M) (R929) becomes more dominant. Initially, NO levels increase with the addition of hydrogen peroxide, but they start to decline at higher proportions of hydrogen peroxide. The initial increase may be attributed to the higher flame temperature, while the subsequent decrease could be linked to a substantial reduction in atmospheric nitrogen levels in the oxidizer. In situations where, pure hydrogen peroxide is used as the oxidizer, there is no production of NOx in pure propane combustion due to the lack of nitrogen. When compared to pure ammonia combustion, cofiring results in approximately half the amount of NOx emissions.

利用空气和过氧化氢作为氧化剂对氨-丙烷共烧特性的数值研究
在本研究中,我们研究了在空气中引入不同量的过氧化氢对丙烷和氨气共燃行为的影响。在丙烷/氨气/空气/过氧化氢的不同成分中,我们探索了各种燃烧标准,包括火焰速度、点火延迟、热量释放、氮氧化物排放和反应途径。这项研究采用了详细的动力学机制,包括 188 种物质和 1604 个反应。研究结果表明,用过氧化氢替代空气可提高层流燃烧速度、热释放率和火焰温度。过氧化氢的高反应活性会导致 OH 和 H 自由基的显著增加,从而随着氧化剂中过氧化氢含量的增加而加快反应速率。反应 H + O2↔O + OH (R906) 在增强燃料/空气混合物的火焰传播方面发挥着最重要的作用。然而,随着混合物中过氧化氢含量的增加,该反应的影响逐渐减弱,而 H2O2(+M)↔2OH(+M) (R929)反应则变得更加主要。最初,NO 含量随着过氧化氢的加入而增加,但当过氧化氢的比例越高时,NO 含量开始下降。最初的增加可能是由于火焰温度升高,而随后的减少可能与氧化剂中大气氮含量的大幅降低有关。在使用纯过氧化氢作为氧化剂的情况下,由于缺少氮,纯丙烷燃烧不会产生氮氧化物。与纯氨燃烧相比,联合燃烧产生的氮氧化物排放量约为后者的一半。
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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