An experimental study of coal particle group combustion in conventional and oxy-fuel atmospheres using multi-parameter optical diagnostics期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

An experimental study of coal particle group combustion in conventional and oxy-fuel atmospheres using multi-parameter optical diagnostics

Affiliation:	1. Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA;2. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China;3. Technical University of Darmstadt, Department of Mechanical Engineering, Reactive Flows and Diagnostics, Otto-Berndt-Str. 3, 64287 Darmstadt, Germany;1. Technical University of Darmstadt, Department of Mechanical Engineering, Reactive Flows and Diagnostics, Otto-Berndt-Str. 3, Darmstadt 64287, Germany;2. Barlow Combustion Research, Livermore, USA;1. Institute of Energy and Power Plant Technology, Darmstadt University of Technology, Jovanka-Bontschits-Straße 2, Darmstadt 64287, Germany;2. Institute of Reactive Flows and Diagnostics, Darmstadt University of Technology Jovanka-Bontschits-Straße 2, Darmstadt 64287, Germany;3. Department of Energy Plant Technology, Ruhr University Bochum, Universitätsstraße 150, Bochum 44780, Germany

Abstract:	The present work reports an experimental study of particle group combustion of pulverized bituminous coal in laminar flow conditions using advanced multi-parameter optical diagnostics. Simultaneously conducted high-speed scanning OH-LIF, diffuse backlight-illumination (DBI), and Mie scattering measurements enable analyses of three-dimensional volatile flame structures and soot formation in conventional (i.e., N $_{2}$ /O $_{2}$ ) and oxy-fuel (i.e., CO $_{2}$ /O $_{2}$ ) atmospheres with increasing O $_{2}$ enrichment. Particle-flame interaction is assessed by calculating instantaneous particle number density (PND), whose uncertainties are estimated by generating synthetic particles in DBI image simulations. Time-resolved particle sequences allow the evaluation of the particle velocity, which indicates a PND dependency and interactions between particles and volatile flames. 3D flame structure reconstruction and soot formation detection are first demonstrated in single-shot visualizations and then extended to analyze effects of O $_{2}$ concentration, PND, and inert gas composition statistically. The increasing O $_{2}$ concentration significantly reduces local flame extinction and suppresses soot formation in N $_{2}$ and CO $_{2}$ atmospheres. Volatile flames reveal higher intensities and lower lift-off heights as O $_{2}$ concentration increases. In contrast to that, an increased PND leads to earlier flame extinction and stronger soot formation due to the local gas temperature reduction and oxygen depletion. The lift-off height reduces with increasing PND, which is explained by the complex interaction between particle dynamics, heat transfer, and volatile reactions. Slightly stronger soot formation and delayed ignition are observed in CO $_{2}$ atmospheres, whereas CO $_{2}$ replacement reveals insignificant influences on the flame extinction behavior. Finally, non-flammability is quantified for particle group combustion at varying PNDs in different atmospheres.

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