Prediction of nano/micro aluminum particles ignition in oxygen atmosphere

Zou, Xiangrui; Wang, Ningfei; Liao, Lijuan; Chu, Qingzhao; Shi, Baolu

doi:10.1016/j.fuel.2019.116952

Cited by 65 publications

(11 citation statements)

References 57 publications

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“… 17 has a similar kinetics form as eq 3 . In a recent work of Zou et al, 40 they combined the reported model in Trunov et al 17 and kinetics in Merzhanov et al 41 They fitted the kinetic parameters in the form of eq 3 for micron-sized aluminum particles. The fitted pre-exponential factor (m 2 /s) was found to correlate with the particle temperature as 1.67 × 10 –12 T P −1.56 × 10 –9 and the activation energy E is fitted as 71 060 J/mol for micron-sized aluminum particles.…”

Section: Methodsmentioning

confidence: 99%

On Modeling the Combustion of a Single Micron-Sized Aluminum Particle with the Effect of Oxide Cap

2021

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The formation of oxide cap, which results from the condensation of gaseous aluminum oxide, makes a non-negligible impact on the combustion process of micron-sized aluminum particles, but its growth and effect are still unknown. Also, the transition of combustion modes during the combustion process, which affects the growth rate of the oxide cap, needs to be explored. Therefore, a detailed combustion model of a single micron-sized aluminum particle is developed to predict the transition of combustion modes and the effect of the oxide cap. This combustion model consists of a vapor-phase kinetic model and a particle model coupled by the Strang splitting algorithm. The predicted ignition delay and combustion times are compared with experimental data to validate the combustion model. Three combustion modes including vapor-phase, transitional, and surface combustions are considered in this combustion model. We find that the two modes coexist for particles between 100 and 200 μm when the ambient temperature and pressure are 2500 K and 1 atm, respectively. A higher ambient temperature extends the transition of combustion mode toward smaller sizes. An oxide cap model considering surface free energy is proposed to study the growth and effect of the oxide cap on the combustion process of micron-sized aluminum particles. We find that the formation of oxide cap limits the evaporation rate of aluminum directly due to the reduced active surface area. The oxide cap stabilizes the evolution of particle temperature and determines the burning time. The predicted burning time is reduced by a factor of 2 at least considering the growth of oxide cap.

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Section: Methodsmentioning

confidence: 99%

On Modeling the Combustion of a Single Micron-Sized Aluminum Particle with the Effect of Oxide Cap

2021

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“…554 Additional complexities are encountered in the combustion of aluminum in the different reaction modes. Ignition and reaction processes have been studied both, experimentally 562−564 and numerically, 561,563,565 using different assumptions on the particle-laden phase, particle properties, heat transfer, and heterogeneous reactions. 561,563,565 Diagnostic techniques beyond visual inspection (see also Section 2.1.1) have included Mie scattering, 563,564 TDLAS, 563 PIV, 562 laser sheet holography, 562 as well as spectral analysis.…”

Section: Metal Fuelsmentioning

confidence: 99%

“…Ignition and reaction processes have been studied both, experimentally 562−564 and numerically, 561,563,565 using different assumptions on the particle-laden phase, particle properties, heat transfer, and heterogeneous reactions. 561,563,565 Diagnostic techniques beyond visual inspection (see also Section 2.1.1) have included Mie scattering, 563,564 TDLAS, 563 PIV, 562 laser sheet holography, 562 as well as spectral analysis. 562,564 Investigations have been performed for different configurations, particle sizes, and reactive atmospheres, 560,565 including CO 2 /CO/N 2 mixtures, 560 a hot coflow, 563 jet flames, 563,564 and supercritical water.…”

Section: Metal Fuelsmentioning

confidence: 99%

“…Recent literature mainly considers the role of metals as energy carriers, − in heat and power generation processes, ,− and addresses also life-cycle analyses . Several metals are being discussed with numerous studies on iron ,− and aluminum, ,− also considering, e.g, lithium and magnesium. ,, Alumina combustion can be performed in air or in water, with the latter providing also hydrogen as a product. ,,, Hydrogen production on demand at any desired location, at different scales, from the highly exothermic reactions of light metals (Al, Mg, Li) with water could be a significant technological advantage. , A schematic view of an aluminum-based power generation process is shown in Figure …”

Section: Fuels For a Carbon-reduced Perspectivementioning

confidence: 99%

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Combustion, Chemistry, and Carbon Neutrality

Kohse‐Höinghaus

2023

Chem. Rev.

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Combustion is a reactive oxidation process that releases energy bound in chemical compounds used as fuels�energy that is needed for power generation, transportation, heating, and industrial purposes. Because of greenhouse gas and local pollutant emissions associated with fossil fuels, combustion science and applications are challenged to abandon conventional pathways and to adapt toward the demand of future carbon neutrality. For the design of efficient, low-emission processes, understanding the details of the relevant chemical transformations is essential. Comprehensive knowledge gained from decades of fossil-fuel combustion research includes general principles for establishing and validating reaction mechanisms and process models, relying on both theory and experiments with a suite of analytic monitoring and sensing techniques. Such knowledge can be advantageously applied and extended to configure, analyze, and control new systems using different, nonfossil, potentially zero-carbon fuels. Understanding the impact of combustion and its links with chemistry needs some background. The introduction therefore combines information on exemplary cultural and technological achievements using combustion and on nature and effects of combustion emissions. Subsequently, the methodology of combustion chemistry research is described. A major part is devoted to fuels, followed by a discussion of selected combustion applications, illustrating the chemical information needed for the future.

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“…In recent years, the oxidation behavior of nano-Al particles has received attention from researchers. [29][30][31][32][33] Oxidation of nano-Al particles would cause the rupture of oxide shell layer due to volume expansion, which would result in the formation of many fine alumina particles, 30 and these generated alumina particles can theoretically serve as nucleation sites for α-Al 2 O 3 . This in situ generation of seeds can avoid the negative effects caused by the morphology and size of the applied seeds.…”

Section: Introductionmentioning

confidence: 99%

Preparation of spherical α‐Al₂O₃ nanoparticles by microwave hydrothermal synthesis and addition of nano‐Al seeds

Wang

Mai

et al. 2022

J Am Ceram Soc.

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Due to their special appearance, spherical α‐Al2O3 nanoparticles play an important role for obtaining high‐performance structural and functional ceramics. However, there are still problems such as easily agglomerates to form worm‐like structures at high temperatures and difficult availability of spherical nanoparticles. In this study, spherical α‐Al2O3 nanoparticles with high dispersion were prepared by a combination of a microwave hydrothermal method and an addition of nano‐Al particles as seeds. First, spherical amorphous alumina precursors were synthesized by the microwave hydrothermal method at 100°C for 30 min using Al2(SO4)3·18H2O, Al(NO3)3·9H2O, and urea, as raw materials, and then spherical α‐Al2O3 nanoparticles with a diameter of about 66 nm were acquired after calcined the precursor at 1050°C for 90 min by adding nano‐Al seeds, which reduced the calcination temperature by 50°C and holding time by 30 min compared to that without seeds. Kinetic analysis shows that 5 wt.% nano‐Al seeds can reduce the activation energy of crystalline transition of γ‐Al2O3 to α‐Al2O3 from 516.51 to 474.37 kJ/mol. Moreover, the microscopic mechanism of nano‐Al particles as seeds was investigated. The characterizations of sintering properties show that spherical α‐Al2O3 nanoparticles facilitate the acquisition of uniform microstructure for resulting ceramic and the fracture modes include both intergranular and transgranular fractures.

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Prediction of nano/micro aluminum particles ignition in oxygen atmosphere

Cited by 65 publications

References 57 publications

On Modeling the Combustion of a Single Micron-Sized Aluminum Particle with the Effect of Oxide Cap

On Modeling the Combustion of a Single Micron-Sized Aluminum Particle with the Effect of Oxide Cap

Combustion, Chemistry, and Carbon Neutrality

Preparation of spherical α‐Al₂O₃ nanoparticles by microwave hydrothermal synthesis and addition of nano‐Al seeds

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Prediction of nano/micro aluminum particles ignition in oxygen atmosphere

Cited by 65 publications

References 57 publications

On Modeling the Combustion of a Single Micron-Sized Aluminum Particle with the Effect of Oxide Cap

On Modeling the Combustion of a Single Micron-Sized Aluminum Particle with the Effect of Oxide Cap

Combustion, Chemistry, and Carbon Neutrality

Preparation of spherical α‐Al2O3 nanoparticles by microwave hydrothermal synthesis and addition of nano‐Al seeds

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Product

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Preparation of spherical α‐Al₂O₃ nanoparticles by microwave hydrothermal synthesis and addition of nano‐Al seeds