scholarly journals Prediction of NOx formation in pulverized coal combustion fields using large-eddy simulation

2015 ◽  
Vol 35 (137) ◽  
pp. 26-31
Author(s):  
Hiroaki WATANABE
Keyword(s):  
Large Eddy Simulation ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Nox Formation ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals Large-eddy Simulation of Pilot-assisted Pulverized-coal Combustion in a Weakly Turbulent Jet

2017 ◽  
Vol 99 (2) ◽  
pp. 531-550 ◽  
Author(s):  
Kaidi Wan ◽  
Jun Xia ◽  
Zhihua Wang ◽  
Mohamed Pourkashanian ◽  
Kefa Cen
Keyword(s):  
Large Eddy Simulation ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Turbulent Jet ◽  
Pulverized Coal Combustion ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation on the Effects of Coal Particles Size on Turbulent Combustion Characteristics and NOx Formation Inside a Corner-Fired Furnace

2020 ◽  
Vol 143 (8) ◽  
Author(s):  
Wenjing Sun ◽  
Wenqi Zhong ◽  
Jingzhou Zhang ◽  
Tarek Echekki
Keyword(s):  
Large Eddy Simulation ◽  
Coal Combustion ◽  
Flame Temperature ◽  
Particle Dispersion ◽  
Combustion Characteristics ◽  
Pulverized Coal ◽  
Nox Formation ◽  
Eddy Simulation ◽  
Coal Particles ◽  
Large Eddy

Abstract The effects of pulverized coal particles’ sizes on the coal combustion characteristics are numerically studied in a laboratory-scale tangentially fired furnace. The turbulent gas flow and the coal particle motion are solved by employing the large eddy simulation (LES) and the discrete phase model (DPM). The mixture fraction probability density function (MF-PDF) is coupled to simulate the non-premixed pulverized coal combustion. It is found that the coal combustion efficiency is positively affected by the dispersion of coal powders. The particle dispersion and the coal combustion are augmented by the intensive impingement caused by the corner-injected flow. Large coal particles, with their greater inertia, enhance particle agglomerations, which limit the combustion of volatile and char. Accordingly, the average flame temperature decreases with the growing particle sizes. Also, the O2 concentration increases slightly because of the incomplete coal combustion, and the CO2 concentration decreases gradually. In contrast, the CO concentration increases markedly in the furnace center due to the presence of a reducing atmosphere. The NO concentration exhibits an exponential decline with the increased particle size. A relatively stable combustion and a relatively low NOx formation are acquired inside such a corner-fired furnace when the particle Stokes number is a little greater than 1.

Large-eddy simulation of pulverized coal combustion using flamelet model

2017 ◽  
Vol 36 (2) ◽  
pp. 2155-2163 ◽  
Author(s):  
Junya Watanabe ◽  
Teruyuki Okazaki ◽  
Kenji Yamamoto ◽  
Koji Kuramashi ◽  
Akira Baba
Keyword(s):  
Large Eddy Simulation ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Flamelet Model ◽  
Eddy Simulation ◽  
Large Eddy
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