What does this research mean for the field?

In oxy-fuel pulverized coal combustion, using an oxygen mole fraction of 0.30 restores air-fired ignition timing and peak temperature while increasing cumulative extracted heat by approximately 28%, with particle clustering dynamics strongly dictating the transition between diffusion and partially premixed burning modes. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To examine the effects of carrier-gas composition, particle mass loading, and preferential concentration on coal particle heat-up, devolatilization, and ignition in turbulent combustion flows.

September 15, 2026Computers & FluidsOpen Access

Heat-up, devolatilization, and ignition of coal particles using point-particle direct numerical simulation

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Authors

HHHeinrich HeinzerETH Zurich DMDaniel W. MeyerETH Zurich PJPatrick JennyJames Madison University

Discussion

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Implication

Numerical simulation reveals that thirty percent oxygen restores air-fired ignition timing in oxy-fuel coal combustion, highlighting pathways to optimize low-emission retrofits.

Key Points

To examine the effects of carrier-gas composition, particle mass loading, and preferential concentration on coal particle heat-up, devolatilization, and ignition in turbulent combustion flows.
Conducted point-particle direct numerical simulations of coal particles in statistically homogeneous and isotropic turbulence at a Taylor-scale Reynolds number of approximately 48.
Used a single-species methane surrogate for coal volatiles across particle mass loadings from 0.006 to 0.025 and Stokes numbers from 1 to 20.
Evaluated combustion performance in air and in oxygen/carbon dioxide mixtures with oxygen mole fractions varying from 0.25 to 0.35.
Replacing nitrogen with carbon dioxide prolongs ignition delay, but an oxygen mole fraction of 0.30 restores air-fired ignition timing and peak temperature while increasing cumulative extracted heat by approximately 28%.
Higher particle mass loading intensifies heat-release rates and transitions the reaction zone from individual particle diffusion flames to cluster-scale partially premixed combustion without substantially altering global ignition delay.
Lower Stokes numbers induce dense particle clustering that produces earlier, hotter ignition, whereas higher Stokes numbers result in delayed, weaker, and dispersed diffusion flames.

Cite This Study

Heinzer et al. (2026) studied this question.

synapsesocial.com/papers/6aa9132f9013453be30a0ee8 https://doi.org/10.1016/j.compfluid.2026.107281

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September 15, 2026Computers & FluidsOpen Access

Heat-up, devolatilization, and ignition of coal particles using point-particle direct numerical simulation

View Full Paper

Ask AI

Bookmark

Authors

HHHeinrich HeinzerETH Zurich DMDaniel W. MeyerETH Zurich PJPatrick JennyJames Madison University

Discussion

Member takes

Implication

Numerical simulation reveals that thirty percent oxygen restores air-fired ignition timing in oxy-fuel coal combustion, highlighting pathways to optimize low-emission retrofits.

Key Points

To examine the effects of carrier-gas composition, particle mass loading, and preferential concentration on coal particle heat-up, devolatilization, and ignition in turbulent combustion flows.
Conducted point-particle direct numerical simulations of coal particles in statistically homogeneous and isotropic turbulence at a Taylor-scale Reynolds number of approximately 48.
Used a single-species methane surrogate for coal volatiles across particle mass loadings from 0.006 to 0.025 and Stokes numbers from 1 to 20.
Evaluated combustion performance in air and in oxygen/carbon dioxide mixtures with oxygen mole fractions varying from 0.25 to 0.35.
Replacing nitrogen with carbon dioxide prolongs ignition delay, but an oxygen mole fraction of 0.30 restores air-fired ignition timing and peak temperature while increasing cumulative extracted heat by approximately 28%.
Higher particle mass loading intensifies heat-release rates and transitions the reaction zone from individual particle diffusion flames to cluster-scale partially premixed combustion without substantially altering global ignition delay.
Lower Stokes numbers induce dense particle clustering that produces earlier, hotter ignition, whereas higher Stokes numbers result in delayed, weaker, and dispersed diffusion flames.

Cite This Study

Heinzer et al. (2026) studied this question.

synapsesocial.com/papers/6aa9132f9013453be30a0ee8 https://doi.org/10.1016/j.compfluid.2026.107281

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