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Numerical simulation of soot formation in pulverized coal combustion with detailed chemical reaction mechanism
Authors:Masaya Muto  Kohei Yuasa  Ryoichi Kurose
Affiliation:Department of Mechanical Engineering and Science, Kyoto University, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto 615–8540, Japan
Abstract:A two-dimensional unsteady numerical simulation with a detailed chemical reaction mechanism that considers 158 species and 1804 reactions is applied to pulverized coal combustion in a mixing layer and the soot formation behavior is investigated in detail. The computational conditions and ignition process are the same as those in our previous work (Muto et al., 2017). The results show that the peak of the mass density of the soot is distributed in the region where the gas temperature is higher than the unburned gas temperature of the mixture of volatile matter and air (1300–1400?K) and lower than the flame temperature (2000?K ). This is due to the fact that soot formation from the precursors (C2H2 and C6H6) is enhanced as the gas temperature increases, whereas the quantities of the precursors and the produced soot are reduced due to oxidation at the higher gas temperature condition that exists close to the flame. The peak value of the mass density of the soot is also distributed in the region between the peak values of the gas temperature and the probability density function of the number of coal particles.
Keywords:Two-dimensional unsteady numerical simulation  Pulverized coal combustion  Detailed chemical reaction mechanism  Soot formation
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