Flamelet LES modeling of coal combustion with detailed devolatilization by directly coupled CPD

Rieth, Martin; Clements, Alastair; Rabaçal, M.; Proch, Fabian; Stein, Oliver T.; Kempf, Andreas

doi:10.1016/j.proci.2016.06.077

Cited by 81 publications

(57 citation statements)

References 60 publications

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“…The volatile combustion is modeled by the previously validated DRM22 121 skeletal mechanism proposed by Kazakov and Frenklach [39], involving 22 chemical species and 122 104 elementary reactions. The compositions of the volatile fuels are obtained from the chemical 123 percolation devolatilization (CPD) model [40] and the Tar species is replaced by C2H2 [32], as shown 124…”

Section: One-dimensional Premixed/diffusion Flames Of Coal Volatile 118mentioning

confidence: 99%

“…Yang brown coal [17] are employed ( Table 1) Coal pyrolysis, including Na/Cl/S release, volatile-gas combustion and Na/Cl/S reactions are 175 simulated. Heterogeneous reaction of char is not considered, because its contribution is weak in a 176 small-scale pulverized-coal flame, as already demonstrated in [32,34,42]. 177…”

Section: Pulverized-coal Flame Configuration and Numerics 156mentioning

confidence: 99%

“…[24][25][26]) towards high-fidelity approaches, i.e., large-eddy simulation (LES, 85 e.g. [27][28][29][30][31][32][33][34]) and direct numerical simulation (DNS, e.g., [35][36][37]). The high-fidelity approaches of 86 LES and DNS have demonstrated advantages over RANS in predicting local distributions of gas 87 temperature and species concentrations.…”

Section: Introduction 35mentioning

confidence: 99%

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Numerical study of HCl and SO2 impact on sodium emissions in pulverized-coal flames

Wan

Wang

Xia

et al. 2019

Fuel

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14Sodium emissions during pulverized-coal combustion (PCC) are known to result in severe 15 ash-related operating issues of coal furnaces, e.g., fouling, slagging and corrosion. To relieve these 16 issues and advance the clean utilization technologies of coal, a better understanding of the 17 fundamental mechanisms driving the formation and transformation of the sodium species is required. 18In the present study, sodium emissions have been simulated in both one-dimensional (1D) 19 premixed/diffusion flames of the coal volatile and an early-stage two-dimensional (2D) 20 pulverized-coal flame. The properties of Loy Yang brown coal are used. The DRM22 skeletal 21 mechanism is employed for volatile-gas combustion, and the reaction of sodium species is modeled 22 by a detailed mechanism encompassing the elements Na, C, H, O, S and Cl. The compositions of the 23 volatile fuels are obtained from the chemical percolation devolatilization (CPD) model, including 24 CH4, C2H2, CO, H2, CO2 and H2O. The initial species of Na, Cl and S in the volatile gas is set to be 25NaOH, HCl and SO2, respectively. The transformation characteristics of 12 sodium species are 26 investigated in both the 1D volatile flames and the 2D pulverized-coal flame. The response of the 27 sodium chemistry to volatile-gas combustion is analyzed under fuel-lean, stoichiometric and 28 2 fuel-rich conditions. Na, NaOH and NaCl are found to be the major sodium species during the 29 combustion. Parametric studies with HCl, SO2 or both species removed from the volatile are then 30 performed to investigate their effects on the sodium transformation characteristics in both the 1D and 31 2D flames. The results show that HCl has a much stronger ability to react with sodium species than 32 SO2. 33

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Section: One-dimensional Premixed/diffusion Flames Of Coal Volatile 118mentioning

confidence: 99%

Section: Pulverized-coal Flame Configuration and Numerics 156mentioning

confidence: 99%

Section: Introduction 35mentioning

confidence: 99%

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Numerical study of HCl and SO2 impact on sodium emissions in pulverized-coal flames

Wan

Wang

Xia

et al. 2019

Fuel

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“…In our previous study, the representative particle streams had equally distributed mass fractions and the same volume‐averaged diameters as the measured data . Rieth et al set the particle diameter for each parcel with the same mass at the inflow by stochastic sampling from a measured PSD . The above methods for defining the initial PSD are largely based on the researchers' experiences and lack of a theoretical foundation.…”

Section: Introductionmentioning

confidence: 99%

Identification of the initial particle size distribution for coal combustion simulations

Shen

Zhou

et al. 2019

AIChE Journal

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Pulverized coal generally features wide particle-size distributions (PSD). How to set an initial PSD in coal combustion simulation remains an open question. To answer this, the Gaussian-quadrature theory was applied to provide a discrete reconstruction of the PSD described by Rosin-Rammler and Upper-Limit functions. From the perspective of the moments of PSD, a theoretical analysis was conducted for mass, momentum, and energy exchange terms between gas and particle phases in pulverized coal jet flame. The analysis presented that the first, the second and the third moments of PSD were the most important to capture the flame ignition behavior. The large eddy simulations showed that the proposed method with two or more particle sizes could provide good predictions of flame ignition distances. And Sauter mean diameter (D 32 ) could represent the complete PSD when predicting the ignition behavior of pulverized coal jet flame. K E Y W O R D Scoal combustion, Gaussian quadrature, initial particle size distribution, large eddy simulation, moments

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“…With respect to particle combustion, heterogeneous reactions can be considered in a flamelet framework by accounting for an additional mixture fraction variable [25]. In addition, flamelet-based models have been also used in LES of pulverized coal combustion [26][27][28].…”

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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Flamelet LES modeling of coal combustion with detailed devolatilization by directly coupled CPD

Cited by 81 publications

References 60 publications

Numerical study of HCl and SO2 impact on sodium emissions in pulverized-coal flames

Numerical study of HCl and SO2 impact on sodium emissions in pulverized-coal flames

Identification of the initial particle size distribution for coal combustion simulations

A flamelet/progress variable approach for modeling coal particle ignition

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