Numerical simulation and validation of gas-particle rectangular jets in crossflow

Tian, Zhao Feng; Witt, Peter J.; Yang, William; Schwarz, M. Philip

doi:10.1016/j.compchemeng.2010.09.007

Cited by 10 publications

(4 citation statements)

References 34 publications

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“…Predictions using the SST model and BSL k-ω model were almost identical, and results of the standard k-ε model and the RNG k-ε model were similar (Tian et al 2010b). The SST model and the standard k-ε model were further tested in modelling an isothermal gas-particle flow in three inclined rectangular jets in crossflow (Tian et al 2011). The flow configuration and flow conditions were scaled based on typical flow conditions experienced in the Victorian brown coal furnace burners (Tian et al 2010a).…”

Section: Turbulence Modelsmentioning

confidence: 99%

Numerical Modelling of Pulverised Coal Combustion

Tian,

Witt,

Schwarz

et al. 2023

Handbook of Multiphase Flow Science and Technology

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Section: Turbulence Modelsmentioning

confidence: 99%

Numerical Modelling of Pulverised Coal Combustion

Tian,

Witt,

Schwarz

et al. 2023

Handbook of Multiphase Flow Science and Technology

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“…Turbulence is modeled using the standard k –ε turbulence model. This was chosen after testing a number of turbulence models for coal combustion in a non-swirl burner, gas–particle flows through rectangular jets inclined to a cross-flow, and brown coal combustion in a furnace . The second case is representative of air and coal particle flows through the slot burners used in the tangentially fired furnace.…”

Section: Cfd Model Descriptionmentioning

confidence: 99%

“…In our previous work, , the CFD model used here was validated by comparing the FGET, concentration of flue gas components, total boiler heat supply, and wall incident heat fluxes to power plant measurements. Additionally, validation of submodels for gas–particle flows, coal and volatile combustion, and turbulence , was performed on simpler flows, where more detailed measurements could be taken under controlled operating conditions. Readers requiring further information on the CFD model used in this work are referred to the detailed description of the model and current furnace operating conditions with wet brown coal that are given in our previous studies. , …”

Section: Cfd Model Descriptionmentioning

confidence: 99%

Combustion of Predried Brown Coal in a Tangentially Fired Furnace under Different Operating Conditions

Tian

Witt²,

Schwarz³

et al. 2012

Energy Fuels

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A major challenge in the use of brown coal in Victoria, Australia, for power generation is its high moisture content, which results in high greenhouse gas emissions. Predrying technologies for coal are one option being considered for use in browncoal-fired power plants in Victoria to reduce greenhouse gas emissions. Using a validated computational fluid dynamics (CFD) model, this study investigates the combustion of predried brown coal in a 375 MW tangentially fired furnace that was designed for raw or non-predried brown coal. Different operating arrangements of the fuel gas for the predried coal with various moisture contents are proposed and assessed. When predried brown coal is burned with 55% or lower moisture content, the CFD results indicate that additional gas needs to be added to the fuel gas to maintain the original mass flow rate and reduce the heat flux in the furnace. Arrangements with additional air or recirculated flue gas added to the fuel gas are proposed and tested for predried coal with 55, 45, 35, 25, and 15% moisture contents. The increase in the furnace temperature for the recirculated flue gas arrangement is smaller than that of the additional air arrangement, and stack loss is expected to be smaller than for additional air cases. The temperature distributions and wall heat fluxes in the boiler for the recirculated flue gas cases are similar to that of the raw coal combustion case. Therefore, use of recirculated flue gas is proposed as an option for future operation of the furnace with predried coal. Nevertheless, further studies are essential to understand the technical and financial feasibility of using flue gas to maintain the fuel gas flow rate.

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“…Fluid flows, heat and mass transfer, as well as chemical reactions are common transport processes. Among them, turbulent shear flows often occur in chemical engineering including turbulent jet flows, turbulent reactions and combustions, and so on. Studying turbulent shear flows enables the comprehension of fluid flows in chemical engineering.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of turbulent shear flows using production‐limited delayed detached‐eddy simulation

2020

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In chemical engineering, turbulent shear flows are often encountered. The grid induced separation (GIS) and the slow RANS-LES transition issues should be alleviated when the delayed detached-eddy simulation (DDES) is used to simulate turbulent shear flows. This paper studies the performance of the production-limited DDES (PL-DDES) model in improving the GIS and the slow RANS-LES transition issues. Since the simplified IDDES (S-IDDES) model is proposed to improve the GIS issue, the S-IDDES model is chosen as the model for comparison. The simulation results show that the PL-DDES model with constant C d1 = 14 alleviates the GIS issue better than the S-IDDES model and the PL-DDES model with C d1 = 8. The results of the free shear layer show that the PL-DDES model can switch RANS to LES more rapidly and unlock the Kelvin-Helmholtz instability more effectively than the S-DDES model. For the backward-facing step flow, the S-IDDES model performs poorly when unlocking the Kelvin-Helmholtz instability in the separation zone. On the other hand, the PL-DDES model has a rapid RANS-LES transition after the step and produces a significant transport of momentum in the shear layer, leading to reasonable separation distance and flow structures. K E Y W O R D S grid induced separation, production-limited DDES, RANS-LES transition, turbulent shear flows

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Numerical simulation and validation of gas-particle rectangular jets in crossflow

Cited by 10 publications

References 34 publications

Numerical Modelling of Pulverised Coal Combustion

Numerical Modelling of Pulverised Coal Combustion

Combustion of Predried Brown Coal in a Tangentially Fired Furnace under Different Operating Conditions

Numerical investigation of turbulent shear flows using production‐limited delayed detached‐eddy simulation

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