Large eddy simulation of a semi-industrial scale coal furnace using non-adiabatic three-stream flamelet/progress variable model

Wen, Xu; Luo, Kun; Luo, Yujuan; Kassem, Hassan; Jin, Hanhui; Fan, Jianren

doi:10.1016/j.apenergy.2016.09.034

Cited by 54 publications

(15 citation statements)

References 43 publications

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“…Despite the quantitative discrepancies in the data, all the qualitative trends in the timeaveraged variables are in agreement. Furthermore, the quantitative discrepancies between the experiment and LES are similar or lower than the ones reported for example in [2,8] or in [19]. The initial comparison of measured and computed flow dynamics is performed utilizing the spectra of streamwise and spanwise velocity components evaluated in the points p 1 and p 2 depicted in the left hand side of Figure 4 and located at (4, 0, 0) and (4.53, 1.15, 0), respectively.…”

Section: Computational Remarksupporting

confidence: 77%

“…Two strong trends have been observed in fluid dynamics during the past decade. First, the increasing available computing power have enabled applications of high-fidelity modeling approaches, such as the large eddy simulation (LES), even to industrial-scale problems [1][2][3]. Second, improving measurement techniques, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, it seems that even the dynamic LE simulations are commonly validated against static data, see e.g. [2,[4][5][6]. Furthermore, if any analysis of the system dynamics is performed, it is usually limited to the comparison of turbulence spectra as in [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Validation of large eddy simulation of flow behind a circular cylinder

et al. 2021

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The flow in the wake behind a circular cylinder in a cross-flow at Reynolds number of 4815 was studied both experimentally and via mathematical modeling. The mathematical model was performed as a Large Eddy Simulation (LES), while the experiments were carried out using the time-resolved variant of the Particle Image Velocimetry (PIV) method. Both the simulation and experiment took into account the dynamical aspects of the studied phenomenon, which enabled a detailed validation of the mathematical model. The overall statistical properties of the simulated flow were validated via comparing the time-averaged measured and computed velocity and vorticity fields. To validate the dynamical behavior, the velocity spectra were examined first. Next, the Proper Orthogonal Decomposition (POD) of the spatio-temporal velocity data was performed on both the experimental and numerical data and a comparison of the obtained energetic modes was carried out. All the performed validations have shown a satisfactory agreement between the simulation and the experiment.

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Section: Computational Remarksupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Validation of large eddy simulation of flow behind a circular cylinder

et al. 2021

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“…The authors concluded that the FPV model lacks information in the unsteady state, which is important during ignition, and that the accuracy may be improved by unsteady flamelet calculation or the utilization of different progress variables. Wen et al [13] also evaluated the accuracy of the FPV model in the laminar counter-flow diffusion flames of pulverized coals and showed that the temperature and species distributions predicted using the detailed chemistry were approximately reproduced by the FPV model. Recently, LESs of pulverized coal flames have been performed using the flamelet approach because the sufficiently high accuracy of the FPV model has been confirmed in the detailed verification of the laminar flow.…”

Section: Introductionmentioning

confidence: 99%

Analysis of flame structure using detailed chemistry and applicability of flamelet/progress variable model in the laminar counter-flow diffusion flames of pulverized coals

Akaotsu

Matsushita

Aoki

et al. 2020

Advanced Powder Technology

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Pulverized coal is still found in many practical devices even though it is recognized as "dirty fuel" because of its CO 2 and pollutant emissions. To overcome this problem, advanced coal utilization technologies have been developed using numerical simulations. In this study, the structures of the laminar counter-flow diffusion flames of pulverized coals were investigated by performing simulations based on detailed chemistry. The high-temperature region became narrower as the coal/air ratio increased, because of the departure from the stoichiometric mixture and local quenching by the heat transfer between the gas and solid phases. Further, the applicability of the flamelet/progress-variable (FPV) model was investigated through a priori and a posteriori tests. The a priori test confirmed that the FPV model is capable of reproducing the numerical solutions obtained using the detailed chemistry, including the mass fractions of minor

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“…When this fuel-burning equipment is used for industrial activities, it is crucial to better understand the combustion characteristics inside the furnace. The distribution characteristics of pollutant emissions (e.g., NO emissions), mechanism of NO formation, and emission reduction technology have become some of the hottest issues worldwide [1,2]. There has been increasing cooperation among countries to improve the performance of coal-fired boilers and reduce emissions [3,4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Combustion in 35 t/h Industrial Pulverized Coal Furnace with Burners Arranged on Front Wall

Han

Zhu

et al. 2020

Processes

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Coal-fired industrial boilers should operate across a wide range of loads and with a higher reduction of pollutant emission in China. In order to achieve these tasks, a physical model including two swirling burners on the front wall and boiler furnace was established for a 35 t/h pulverized coal-fired boiler. Based on Computational Fluid Dynamics (CFD) theory and the commercial software ANSYS Fluent, mathematical modeling was used to simulate the flow and combustion processes under 75% and 60% load operating conditions. The combustion characteristics in the furnace were obtained. The flue gas temperature simulation results were in good agreement with experimental data. The simulation results showed that there was a critical distance L along the direction of the furnace depth (x) and Hc along the direction of the furnace height (y) on the burner axis. When x < L, the concentration of NO decreased sharply as the height increased. When y < Hc, the NO concentration decreased sharply with an increase in the y coordinate, while increasing dramatically with an area-weighted average gas temperature increase in the swirl combustion zone. This study provides a basis for optimizing the operation of nitrogen-reducing combustion and the improvement of burner structures.

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Large eddy simulation of a semi-industrial scale coal furnace using non-adiabatic three-stream flamelet/progress variable model

Cited by 54 publications

References 43 publications

Validation of large eddy simulation of flow behind a circular cylinder

Validation of large eddy simulation of flow behind a circular cylinder

Analysis of flame structure using detailed chemistry and applicability of flamelet/progress variable model in the laminar counter-flow diffusion flames of pulverized coals

Numerical Simulation of Combustion in 35 t/h Industrial Pulverized Coal Furnace with Burners Arranged on Front Wall

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