Evolution of particle morphology during char conversion processes applied for the CFD modeling of an entrained-flow gasifier

Cong Bang Nguyen

AutorIn

Cong Bang Nguyen

Titel

Evolution of particle morphology during char conversion processes applied for the CFD modeling of an entrained-flow gasifier

Zitierfähige Url:

https://nbn-resolving.org/urn:nbn:de:bsz:105-qucosa2-751735

Datum der Einreichung

24.03.2021

Datum der Verteidigung

09.06.2021

Abstract (EN)

The change in morphology of a char particle affects both its trajectory and carbon consumption rate, hence the performance and efficiency of an entrained-flow gasifier. Among key processes taking place in the gasifier, the char conversion process is a limiting step for the overall carbon conversion. For that reason, the Ph.D. thesis presents the evolution of morphology of char particles during the carbon conversion process using particle-resolved transient CFD calculations. Analyses of numerical data obtained from the transient CFD calculations were carried out. As a result, new sub models related to the drag coefficient and the fundamental parameters of char conversion model were emerged. The new sub models were applied for modeling a pressured entrained-flow gasifier at laboratory scale. The numerical results of the gasifier show a good agreement with experimental data and an improvement of the sub models applied.

Freie Schlagwörter (EN)

Char conversion, Particle-resolved CFD, Particle shape development, Particle morphology evolution, Intrinsic reactions

Klassifikation (DDC)

660

Normschlagwörter (GND)

Kohlevergasung

Numerische Strömungssimulation

Teilchentechnologie

Partikelsystem

Korngrößenanalyse

GutachterIn