Large-eddy simulation of pulverized coal jet flame – Effect of oxygen concentration on NO  formation

Muto, Masaya; Watanabe, Hiroaki; Kurose, Ryoichi; Komori, Satoru; Balusamy, Saravanan; Hochgreb, Simone

doi:10.1016/j.fuel.2014.10.069

Cited by 82 publications

(31 citation statements)

References 40 publications

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“…However, the thermal histories of coal particles in the experimental facilities can be different from that in the actual large scale boilers because the scale of flame can affect the heat transfer mechanism of the coal particles. Experimental apparatus with various sizes, e. g., the drop tube furnace (8-60 g-coal/h) [21,22], the small coal jet burner (0.5 kg-coal/h) [11,23], the triple stream burner (0.36-2.16 kg-coal/h) [24,25], the RWTH furnace (6-7 kg-coal/h) [26,27], the RWEn Combustion Test Facility (70 kg-coal/h) [28], the BEACH furnace (100 kg-coal/h) [13,29,30,31], the IFRF furnace No. 1 (260 kg-coal/h) [32] and the MARINE furnace (300 kg-coal/h) [19,33], have been used to investigate the coal combustion phenomena or to evaluate the combustion characteristics of various coal brands by some researchers.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Hashimoto

Watanabe

2016

Fuel Processing Technology

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To investigate the effect of the furnace scale on the heat transfer mechanism of coal particles, numerical simulations of coal combustion fields in three different scale furnaces (915 MW th actual large scale boiler, 2.4 MW th and 0.76 MW th test furnaces) were conducted. High accuracy of simulation methods was validated with the measured data. From the comparison of numerical simulations between three different scale furnaces, it was clarified that the particle residence time with high particle temperature for a small scale furnace is shorter than that for a large scale furnace even if the particle residence time passing the high temperature gas is the same. This is caused by the insufficient heat gain of particles for a small scale furnace due to the lower radiation heat transfer because of the thinner flame thickness in the small furnace. The sphericity of ash particles from small scale furnaces is lower than that for large scale furnaces due to the shorter particle residence time with high particle temperature. These findings should be considered when the usability of coal brands for actual large scale boilers is evaluated by the fly ash properties from a small scale experimental furnace.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Hashimoto

Watanabe

2016

Fuel Processing Technology

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“…During the rapid heating of coal particles in pulverized coal combustion and entrained-flow gasification systems, devolatilization and ignition play a fundamental role in characterizing the flame behavior, such as stability, pollutant formation and flame extinction [1][2][3][4][5][6]. Therefore, understanding the phenomena that take place during devolatilization and ignition is essential designing coal thermo-conversion processes.…”

Section: Introductionmentioning

confidence: 99%

A flamelet/progress variable approach for modeling coal particle ignition

Vascellari

Tufano

Stein

et al. 2017

Fuel

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“…Although the experimental researches have brought enormous advances in understanding the combustion field, our knowledge of the physics taking place within the system is limited due to the difficulties in the direct observation of this two-phase reacting flow. As an alternative, a numerical simulation is used to make up for the experiments (Kurose et al, 2007;Hashimoto et al, 2007;Watanabe et al, 2009a;Watanabe et al, 2009b;Kurose et al, 2009;Muto et al, 2015;Franctti et al, 2013). In general, a simple chemical kinetic mechanism namely a global reaction mechanism has been used in the simulation.…”

Section: Introductionmentioning

confidence: 99%

“…In general, a simple chemical kinetic mechanism namely a global reaction mechanism has been used in the simulation. Watanabe and cooperators have performed LES of a lab-scale burner and a semi-industrial-scale furnace with the CxHyOz postulate substance two-step global reaction mechanism (Watanabe et al, 2009b;Kurose et al, 2009;Muto et al, 2015). Franchetti et al (2013) also employed the CxHyOz postulate substance mechanism to perform a LES of a pulverized coal jet flame.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of reaction kinetics of coal volatiles with a detailed chemistry and its simplification

Ahn

Watanabe

Shoji

et al. 2016

JTST

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Reaction kinetics of coal volatile were numerically investigated based on analyses during reaction mechanism reduction procedure in detail in this paper. Computation on a closed homogeneous reactor model was performed to clarify important chemical species and their reaction pathways with evaluating the capability of prediction of ignition delay time and chemical species concentration under a wide range of equivalence ratios and temperatures. The kinetics of large hydrocarbons such as polycyclic aromatic hydrocarbons (PAH) that comprise a large portion of combustion features for complex hydrocarbon materials was focused on in a coal flame. The data computed here was analyzed through the combined process of the directed relation graph with error propagation and sensitivity analysis (DRGEPSA) and the computational singular perturbation (CSP) that can evaluate the roles of each species and reaction pathway respectively in the chemical system. Results show that hydrocarbons such as aromatics, methyl and ethyl groups play important role in the ignition and flame propagation processes. Finally, the skeletal mechanism including 64 species and 150 reactions was derived from the detailed mechanism that consists of 257 species and 1107 reactions within 30% error in the prediction of the ignition delay time and the mole fractions of major species in the propagating flame.

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Large-eddy simulation of pulverized coal jet flame – Effect of oxygen concentration on NO formation

Cited by 82 publications

References 40 publications

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

A flamelet/progress variable approach for modeling coal particle ignition

Numerical investigation of reaction kinetics of coal volatiles with a detailed chemistry and its simplification

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