燃烧
稀释
氮氧化物
氨
开裂
氢
化学
化学工程
反应性(心理学)
限制
材料科学
热力学
有机化学
病理
工程类
物理
替代医学
机械工程
医学
作者
Giovanni Battista Ariemma,Giancarlo Sorrentino,Mara de Joannon,Raffaele Ragucci,Pino Sabia
标识
DOI:10.1021/acs.energyfuels.5c02759
摘要
Ammonia is a promising energy carrier for energy system decarbonization, although several drawbacks affect its combustion process. Coupling moderate or intense low-oxygen dilution (MILD) combustion with the use of high reactivity fuels allows to improve NH3 combustion. In particular, H2 addition may be a feasible strategy, considering the high proportion of H2 achievable by NH3 partial cracking. The present study focuses on MILD combustion effectiveness in ensuring high stability and low-NOx emissions for NH3/H2 blends. Influence of both equivalence ratio and H2 addition was experimentally investigated in a cyclonic reactor. Furthermore, the results were directly compared with those obtained with cracked NH3 mixtures (NH3/H2/N2). Results for NH3/H2 blends strengthen the fuel flexibility of the cyclonic reactor, which allows total conversion of the fuel mixtures by ensuring operating temperatures always lower than 1400 K, independently of the equivalence ratio and the fuel blend composition. In particular, H2 addition increases NH3 reactivity, whereas increasing NOx emissions with respect to pure ammonia. Instead, for pure H2 and pure NH3, they always stay lower than 40 and 100 ppm, respectively. For cracked NH3 mixtures, the fuel dilution content by N2 does not affect the NH3/H2 combustion behavior under MILD conditions. Instead, for 100% NH3 cracking (75%H2-25%N2 mixture), H2 dilution by N2 entails a more uniform reaction zone than not diluted H2 case, further limiting NOx formation by avoiding the occurrence of hot-spot regions within the reactor.
科研通智能强力驱动
Strongly Powered by AbleSci AI