Fabio Henrique Bastiani, Pedro Bianchi Neto, Lizoel Buss, Udo Fritsching, Dirceu Noriler

Abstract: Carbon black is a high-interest industrial material due to its favorable characteristics and applications as nanoparticles. This substance is generated by combustion processes in dif-fusive or turbulent flames. Over the years, distinct models were developed and presented to model soot and carbon black formation kinetics in combustion chambers and reac-tors. One method to manufacture nanoparticles is the Flame Spray Pyrolysis process, with the advantage of offering a more controlled environment to tailor particle’s properties. In this work, simulations of the FSP process are carried out considering the formation of carbon black nanoparticles. CFD simulations were performed approaching the continu-ous phase by an Eulerian framework and the dispersed phase (spray droplets) by a Lagrangian framework. A three-equation model is applied to predict the carbon black for-mation kinetics, and particle radiation is also considered. The injected fuel at the nozzle is composed of pure p-xylene. A 2D axisymmetric approach is considered to represent the enclosed FSP cylindrical reactor, and two different domains were investigated: with and without the surroundings of the reactor. Adiabatic and non-adiabatic wall cases are simulat-ed to study the temperature and carbon black formation profiles. The influence of particle radiation is also analyzed. Results show that the insulated reactor (adiabatic wall) has a higher temperature profile along the reactor, affecting nucleation and oxidation rates of carbon black.

Keywords: Carbon Black, Flame Spray Pyrolysis, CFD.

Date Published: August 2, 2022
DOI: 10.11159/jffhmt.2022.008

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