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Radiation modelling considering burnout-dependent properties and cellwise non-uniform particle distributions in the numerical simulation of pulverised solid fuel combustion - Dataset

Askarizadeh Ravizi, Hossein^RWTH* ; Pielsticker, Stefan^RWTH* ; Nicolai, Hendrik ; Koch, Matthias^RWTH* ; Kneer, Reinhold^RWTH* ; Hasse, Christian ; Maßmeyer, Anna Lisa^RWTH*

2024

Online
DOI: 10.18154/RWTH-2024-07124
URL: https://publications.rwth-aachen.de/record/990075/files/Dataset.zip

Einrichtungen

1. Lehrstuhl für Wärme- und Stoffübertragung (412610)

Projekte

1. DFG project G:(GEPRIS)215035359 - TRR 129: Oxyflame - Entwicklung von Methoden und Modellen zur Beschreibung der Reaktion fester Brennstoffe in einer Oxyfuel-Atmosphäre (215035359) (215035359)
2. DFG project G:(GEPRIS)240966705 - Experimentelle Untersuchung der Biomasseverbrennung zur Validierung numerischer Simulationen (C01) (240966705) (240966705)
3. DFG project G:(GEPRIS)240967567 - Instationäre Modellierung und Simulation von Oxy-Fuel-Feuerräumen (C02) (240967567) (240967567)
4. DFG project G:(GEPRIS)240984532 - Modellierung der Strahlungseigenschaften von pulverisierten Biomassepartikeln bei der Oxy-Fuel-Verbrennung (C04) (240984532) (240984532)

Kurzfassung
The present study evaluates the impact of the gas and particle radiation on flame characteristics of a pulverised solid fuel using Reynolds-averaged Navier–Stokes (RANS) equations. As a reference, a pilot-scale combustor with a 60 kW\textsubscript{th} flame is used. The burner is fed with pulverised (10-180 micro meter) Rhenish lignite particles under oxyfuel conditions (25/75 vol.% O2/CO2). CFD simulations are carried out using Ansys Fluent equipped with user-defined functions (UDFs), e.g., for gas and particle radiative properties and kinetic models (devolatilisation and char conversion) adapted for oxyfuel conditions. Particular focus is placed on evaluating detailed modelling of the particle radiative properties, which are determined with the aid of Mie theory and taken into account in the simulations via UDFs as tabulated data. For this purpose, simulation results for the reference case with constant particle radiative properties (a common assumption in the relevant literature) are compared to those obtained with burnout-dependent particle radiative properties (determined using the Mie theory -- Mie case) as well as to those obtained considering the effect of cellwise non-uniform distributed particles on the burnout-dependent particle radiative properties (within the framework of a recently proposed weighted-scaling approach -- WSA case). Simulation results show that the role of particle radiation is more pronounced in the near-burner region, such that comparisons of the predicted temperatures in different models signify high local temperature differences. The importance of particle radiation reduces with the axial distance from the burner until the differences in the predicted temperatures in all three cases become negligible. In the near-burner region, predictions of the reference case on the particle radiative fluxes are much smaller than those of the Mie and WSA case. These differences lead to high local temperature differences, especially where strong temperature gradients exist. Please cite both the dataset (https://doi.org/10.18154/RWTH-2024-07124) and the paper (https://doi.org/10.1016/j.fuel.2024.133338) if you use the dataset for your research.

OpenAccess:
ZIP
(additional files)

Dokumenttyp
Dataset

Format
online

Sprache
English

Interne Identnummern
RWTH-2024-07124
Datensatz-ID: 990075

Beteiligte Länder
Germany