Numerical simulation of soot formation in pulverized coal combustion with detailed chemical reaction mechanism

2018 ◽  
Vol 29 (5) ◽  
pp. 1119-1127 ◽  
Author(s):  
Masaya Muto ◽  
Kohei Yuasa ◽  
Ryoichi Kurose
Keyword(s):  
Numerical Simulation ◽  
Reaction Mechanism ◽  
Chemical Reaction ◽  
Coal Combustion ◽  
Soot Formation ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Chemical Reaction Mechanism ◽  
Detailed Chemical

Parametric Study of Moss-Brookes (MB) and Moss-Brookes-Hall (MBH) Model Constants for Prediction of Soot Formation in a Turbulent Hydrocarbon Flames

2013 ◽  
Author(s):  
Pravin Rajeshirke ◽  
Pravin Nakod ◽  
Rakesh Yadav ◽  
Stefano Orsino
Keyword(s):  
Reaction Mechanism ◽  
Chemical Reaction ◽  
Parametric Study ◽  
Soot Formation ◽  
Hydrocarbon Flames ◽  
Oxidation Rates ◽  
Numerical Predictions ◽  
Chemical Reaction Mechanism ◽  
Soot Precursors ◽  
Original Works

In the present work, two equation soot models proposed by Moss-Brookes (MB) and Moss-Brookes-Hall (MBH), available in ANSYS FLUENT14.5, are used to study the soot formation in a turbulent kerosene-air flame. The model constants in the original works of MB and MBH model were primarily tuned for the methane-air or other lower hydrocarbon flames. In this work, the emphasis has been given on the applicability of these models in modeling the soot formation in heavy hydrocarbon fuels. The current work is primarily focused on the parametric study of the various modeling constants for calculating the soot inception and oxidation rates. A parametric study is performed to calculate the soot inception rates by considering different soot precursors like C2H2, C2H4, C6H6 and C6H5. Steady laminar flamelet approach with a detailed chemical reaction mechanism (Jet_SurF_2.0), is used for modeling gas phase combustion. The current numerical predictions are compared with experimental results of Young et al. [1] and earlier published numerical results of Wen et al. [2]. The study is further extended to understand the role of chemical reaction mechanism on soot predictions considering detailed versus reduced (JP10revC) chemical mechanisms.

Mechanism of Wall Turbulence Modulation With Premixed Hydrogen Combustion

2019 ◽  
Author(s):  
Takashi Ohta ◽  
Yuta Onishi ◽  
Yasuyuki Sakai
Keyword(s):  
Numerical Simulation ◽  
Thermal Expansion ◽  
Reaction Mechanism ◽  
Wall Turbulence ◽  
Streamwise Vortices ◽  
Turbulence Modulation ◽  
Turbulence Structures ◽  
Chemical Reaction Mechanism ◽  
Vorticity Transport ◽  
Detailed Chemical

Abstract In order to clarify the mechanism of modulation of turbulence structures such as quasi-streamwise vortices affected by a flame propagating toward a wall, we perform a direct numerical simulation of wall turbulence with premixed hydrogen-air combustion using a detailed chemical reaction mechanism. As a result, existing quasi-streamwise vortices in turbulence near the wall are found to be suppressed, disappearing as the flame approaches. Hence, the turbulent flow tends to become laminar. Moreover, according to the analysis of the vorticity transport equation, it is found that the suppression is due to thermal expansion of the flame rather than an increase in viscosity. From the viewpoint of chemical reactions, it is revealed that thermal expansion inside turbulence vortices is mainly caused by reactions involving H2 and H2O2.

Prediction of unburned carbon and NO formation from low-rank coal during pulverized coal combustion: Experiments and numerical simulation

Fuel ◽  
2016 ◽  
Vol 185 ◽  
pp. 478-490 ◽  
Author(s):  
Kevin Yohanes Lisandy ◽  
Jeong-Woo Kim ◽  
Ho Lim ◽  
Seung-Mo Kim ◽  
Chung-Hwan Jeon
Keyword(s):  
Numerical Simulation ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Low Rank ◽  
Unburned Carbon ◽  
Pulverized Coal Combustion ◽  
Low Rank Coal ◽  
No Formation

Numerical simulation of pulverized coal combustion in a power boiler furnace

2015 ◽  
Vol 53 (3) ◽  
pp. 445-452 ◽  
Author(s):  
A. S. Askarova ◽  
V. E. Messerle ◽  
A. B. Ustimenko ◽  
S. A. Bolegenova ◽  
V. Yu. Maximov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Boiler Furnace ◽  
Power Boiler
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