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

Muto, Masaya; Yuasa, Kohei; Kurose, Ryoichi

doi:10.1016/j.fuel.2016.11.029

Cited by 57 publications

(27 citation statements)

References 39 publications

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“…It has been shown that the accurate description of the devolatilization is mandatory for a good prediction of the flame stabilization, because it has a direct impact on the flame structure. 47 Particle swelling is neglected, because Muto et al 48 have shown that it has a negligible effect. Particle sizes are modeled as constant during the devolatilization process.…”

Section: Z Z Zmentioning

confidence: 99%

Numerical Analysis of a Turbulent Pulverized Coal Flame Using a Flamelet/Progress Variable Approach and Modeling Experimental Artifacts

et al. 2021

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A coaxial burner with a hydrogen-supported pulverized coal flame, operated by the Central Research Institute of Electric Power Industry (CRIEPI, Japan), is investigated numerically. The flame is modeled using massively parallel large eddy simulation (LES). A flamelet/progress variable (FPV) approach is used for modeling the complex multiphase flow of the laboratory coal flame. A four-dimensional tabulation method based on non-premixed flamelets is introduced, which uses two mixture fractions for the hydrogen pilot and coal volatiles, respectively, as well as the absolute enthalpy and the reaction progress to parametrize the thermochemical space. Simulations are compared to the experiments in terms of the temperature, gas-phase velocities (with and without consideration of buoyancy), and gas compositions along the centerline and in the radial direction at different heights. The effect of the suction probe on the scalar field measurements is tested by simulating this probing, observing relative changes up to 50% in various quantities and locations. By consideration of these probe effects, the agreement between the experiment and simulation can be improved significantly; at the same time, the simulation also provides the unperturbed scalar fields, without probing effects. The new flamelet model gives a robust and cost-effective prediction of the investigated laboratory flame, provided that the probing effects are considered.

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Section: Z Z Zmentioning

confidence: 99%

Numerical Analysis of a Turbulent Pulverized Coal Flame Using a Flamelet/Progress Variable Approach and Modeling Experimental Artifacts

et al. 2021

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“…With the rapid increase of computing capacity in recent years, computational fluid dynamics (CFD) approaches for multi-phase flows are evolving towards high-fidelity methods, i.e., direct numerical simulation (DNS, e.g., [24][25][26]) and large-eddy simulation (LES, e.g. [27][28][29][30][31][32][33][34]).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of HCl and SO2 impact on potassium emissions in pulverized-biomass combustion

Wan

Wang

Xia

et al. 2019

Fuel Processing Technology

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The potassium vapor released during the combustion of biomass are known to result in serious ash deposition, fouling and corrosion issues of biomass furnaces. To develop potassium control technologies to mitigate these issues and achieve clean utilization of biomass fuel, a better understanding of the fundamental formation and transformation mechanisms of potassium in biomass combustion is essentially required. In the present study, potassium emissions during pulverized-biomass combustion, for the first time, have been simulated in both one-dimensional (1D) premixed/diffusion flames of the biomass volatile and an early-stage two-dimensional (2D) pulverized-biomass flame. The properties of corn straw are used. The volatile-gas combustion is described by the DRM22 skeletal mechanism, while the homogeneous reaction of potassium species is modeled using a detailed mechanism encompassing the elements K, C, H, O, Cl and S. The initial species of K, Cl and S in the volatile gas is set to be KOH, HCl and SO 2 , respectively. The transformation characteristics of the potassium species are numerically investigated in both the 1D and 2D flames. Results show that KOH is the most significant potassium product under fuel-lean, 2 stoichiometric and fuel-rich conditions, while the productions of sulfurous and chloric potassium species are secondary. Parametric studies with HCl, SO 2 or both species replaced with N 2 in volatile gas are then performed to study their impacts on potassium emission characteristics in both the 1D and 2D flames. The results indicate that HCl has a stronger ability to react with potassium species than SO 2 .

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“…[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%

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

Cited by 57 publications

References 39 publications

Numerical Analysis of a Turbulent Pulverized Coal Flame Using a Flamelet/Progress Variable Approach and Modeling Experimental Artifacts

Numerical Analysis of a Turbulent Pulverized Coal Flame Using a Flamelet/Progress Variable Approach and Modeling Experimental Artifacts

Numerical study of HCl and SO2 impact on potassium emissions in pulverized-biomass combustion

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

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