Comprehensive Data Set of Single Particle Combustion under Oxy-fuel Conditions, Part II: Data Set

ABSTRACT

The analysis of the current literature on the subject of detailed single-particle measurements revealed that, despite the fact that numerous experimental investigations are reported, the database for the calibration of predictive burnout models is insufficient. To close this gap, a test rig for the optical investigation of the burning behavior of pulverized fuel particles was put into operation and introduced in the first part of this two-article series. In the second part, the results of a measurement campaign, on a high-volatile bituminous coal, and torrefied Miscanthus in eight oxy-fuel atmospheres are presented. The experimental data contains profiles of particle temperature, size, shape, burnout progress over residence time and, thus, provides a sound basis for the calibration of char burnout models. The combination of chosen optical techniques enables distinguishing between burning and cold particles, the latter being non-ignited or already burnt out. This information is important for the analysis of particle size distributions. In addition to optical measurements, partially reacted solid samples were extracted from the reactor. Besides the proximate and elemental analysis, also the porosity of the samples was determined at several burnout levels. Interestingly, the evolution of particle porosity shows atmosphere-independent trends.

KEYWORDS:

• Optical measurement
• single particle
• particle shape
• biomass
• coal

Acknowledgments

The authors thank the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Projektnummer 215035359 – TRR 129 for its support through CRC/Transregio 129 “Oxy-flame: development of methods and models to describe solid fuel reactions within an oxy-fuel atmosphere. ”Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) – Projektnummer 215035359 – TRR 129“.

We thank our colleagues Carsten Wedler and Roland Span from the department for Thermodynamics for supporting us with density measurements and Till Eckhard and Martin Muhler from the Laboratory of Industrial Chemistry for adsorption measurements. Moreover, we thank Dirk Kirchner from German Mining Museum (DBM in Bochum, Germany) for the light microscopy.

Supplementary material

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Additional information

Funding

This work was supported by the Deutsche Forschungsgemeinschaft [Projektnummer 215035359].