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Flamelet/quadrature-based moment method for modeling laminar sooting pulverized solid fuel flames

X. Wen

Published 2025 in The Physics of Fluids

ABSTRACT

Soot formation in a laminar pulverized coal flame is modeled with an adapted quadrature-based moment method (QBMM) incorporating detailed gas phase kinetics. The formation of polycyclic aromatic hydrocarbons (PAHs) from pyrolysis, and the subsequent soot formation, growth and oxidation, are considered in the soot model. The soot formation characteristics in the pulverized coal flame, e.g., the interaction of different physical and chemical processes in the gaseous and solid phases, are analyzed in detail. It is found that the processes of soot condensation and nucleation are important to the soot particle growth as the amount of PAHs is closely related to the available tar in the secondary pyrolysis, while the other processes only play minor roles. With the detailed chemistry solutions as a reference, an extended flamelet model is formulated and its performance in predicting the gas–soot coupling species and the soot properties is evaluated. Considering that PAHs from tar-cracking and polymerization in the secondary pyrolysis has a direct impact on the modeling approach, different flamelet tabulation methods for prediction tar species are evaluated. The evaluation shows that the tar species can be reasonably predicted by extracting them from the flamelet table directly. For the specific assumptions adopted in this work, scaling tar reaction source term in the transport equation does not necessarily improve the prediction accuracy of the tar concentration, which is clarified by a chemical timescale analysis based on the detailed chemistry solutions. The evaluation also shows that the soot properties such as the soot volume fraction and number density can be accurately predicted with the flamelet/QBMM model.

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