Towards utilization of iron powders for heating and power

Baigmohammadi, Mohammadreza; Prasidha, Willie; Stevens, N.C.; Shoshin, Yuriy; Spee, Tim; Goey, de Lph Philip

doi:10.1016/j.jaecs.2023.100116

Cited by 6 publications

(1 citation statement)

References 24 publications

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“…Note that these iron particles are produced via atomisation and the particle size is adjustable. In the context of the considered power plant oxidation-reduction process typical iron particle sizes are in the range 10-20 µm and therefore comparable to (the low end) of PSDs for pulverised volatile-containing solid fuels (Janicka et al 2023), while their size is expected not to change significantly after multiple oxidation-reduction cycles (Baigmohammadi et al 2023). Future simulations will use the full PSD from Fedoryk et al (2023) to explore the effects of particle size on ignition and combustion.…”

Section: Validationmentioning

confidence: 99%

Carrier-Phase DNS of Ignition and Combustion of Iron Particles in a Turbulent Mixing Layer

Luu,

Shamooni,

Kronenburg

et al. 2024

Flow Turbulence Combust

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Three-dimensional carrier-phase direct numerical simulations (CP-DNS) of reacting iron particle dust clouds in a turbulent mixing layer are conducted. The simulation approach considers the Eulerian transport equations for the reacting gas phase and resolves all scales of turbulence, whereas the particle boundary layers are modelled employing the Lagrangian point-particle framework for the dispersed phase. The CP-DNS employs an existing sub-model for iron particle combustion that considers the oxidation of iron to FeO and that accounts for both diffusion- and kinetically-limited combustion. At first, the particle sub-model is validated against experimental results for single iron particle combustion considering various particle diameters and ambient oxygen concentrations. Subsequently, the CP-DNS approach is employed to predict iron particle cloud ignition and combustion in a turbulent mixing layer. The upper stream of the mixing layer is initialised with cold particles in air, while the lower stream consists of hot air flowing in the opposite direction. Simulation results show that turbulent mixing induces heating, ignition and combustion of the iron particles. Significant increases in gas temperature and oxygen consumption occur mainly in regions where clusters of iron particles are formed. Over the course of the oxidation, the particles are subjected to different rate-limiting processes. While initially particle oxidation is kinetically-limited it becomes diffusion-limited for higher particle temperatures and peak particle temperatures are observed near the fully-oxidised particle state. Comparing the present non-volatile iron dust flames to general trends in volatile-containing solid fuel flames, non-vanishing particles at late simulation times and a stronger limiting effect of the local oxygen concentration on particle conversion is found for the present iron dust flames in shear-driven turbulence.

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Section: Validationmentioning

confidence: 99%

Carrier-Phase DNS of Ignition and Combustion of Iron Particles in a Turbulent Mixing Layer

Luu,

Shamooni,

Kronenburg

et al. 2024

Flow Turbulence Combust

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Decoupling pyrolysis and combustion of organic powders to determine the laminar flame speed

Pietraccini,

Santandrea,

Glaude

et al. 2024

Can J Chem Eng

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Determining the laminar flame speed of dusts is far from straightforward. A strong dependency on the experimental setup and the data treatment's high complexity makes it a true challenge. This work compares three complementary experimental setups to measure the laminar flame speed of organic dust (here, cellulose): a modified Hartmann tube, a 20 L sphere, and a micro‐fluidized bed (MFB) burner. The first two consider the flame propagation phenomenon in its globality, which means that numerous steps are involved simultaneously (particle heating, pyrolysis, oxidation, radiative transfer, flame stretching), while the third one decouples pyrolysis and combustion, to focus mainly on the oxidation rate. An MFB was conceived to generate pyrolysis products and burn them in a laminar flame. Unstretched flame velocities determined with the first two setups were consistent and equal to 22.0 and 26.6 cm ∙ s−1, respectively. Using Silvestrini's equation, values ranging between 14.0 and 33.4 cm ∙ s−1 were obtained according to the dust concentration. With the MFB burner, the flame speed was much higher (135–155 cm ∙ s−1), due to the higher temperature of the fresh mixture and the fact that only the oxidation of the pyrolysis gases is considered. A numerical simulation (Chemkin) confirmed these results since the range 135 to 231 cm ∙ s−1 was obtained for equivalence ratios of 0.6 and 1.2, respectively. The discrepancy between the laminar flame speed determined in the sphere or in the tube and that obtained in the MFB highlights the significant influence of particle heating and pyrolysis during a dust explosion.

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Intracavity laser absorption spectroscopy: Performance and advantages for energy science

Zamir,

Baraban,

Fjodorow

et al. 2024

Applications in Energy and Combustion Science

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Towards utilization of iron powders for heating and power

Cited by 6 publications

References 24 publications

Carrier-Phase DNS of Ignition and Combustion of Iron Particles in a Turbulent Mixing Layer

Carrier-Phase DNS of Ignition and Combustion of Iron Particles in a Turbulent Mixing Layer

Decoupling pyrolysis and combustion of organic powders to determine the laminar flame speed

Intracavity laser absorption spectroscopy: Performance and advantages for energy science

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