Transient process model of open anode baking furnace

Oumarou, Noura; Kocaefe, Duygu; Kocaefe, Yasar S.; Morais, Brigitte

doi:10.1016/j.applthermaleng.2016.07.090

Cited by 11 publications

(6 citation statements)

References 8 publications

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“…A dynamic process model was developed by Oumarou et al to investigate the effect of temperature variation in the vertical component by considering a vertical component of flue gas [22][23][24]. This allows the 2D temperature distribution boundary condition for the pit sub model.…”

Section: Related Workmentioning

confidence: 99%

Effects of Mesh Generation on Modelling Aluminium Anode Baking Furnaces

Libreros

Trujillo

2021

Fluids

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Anode baking is critical in carbon anode production for aluminium extraction. Operational and geometrical parameters have a direct impact on the performance of anode baking furnaces (ABF), and hence on the resulting anode quality. Gas flow patterns, velocity field, pressure drop, shear stress and turbulent dissipation rate are the main operational parameters to be optimised, considering a specific geometry that is discretised as a mesh. Therefore, this paper aims to establish the need to generate an appropriate mesh to perform accurate numerical simulations of three-dimensional turbulent flow in a single section of an ABF. Two geometries are considered for generating three meshes, using COMSOL and cfMesh, with different refinement zones. The three meshes are used for creating nine incompressible isothermal turbulent flow models, with varying operational parameters. Velocity field, convergence and turbulent viscosity ratio in the outlet of fuel inlet pipes are the quantification criteria. Quantification criteria have shown that a better physical representation is obtained by refining in the whole combustion zone. COMSOL Multiphysics’ built-in mesh generator allows quadrilateral, tetrahedron and hexahedron shapes. Adaptive cell sizes and shapes have a place within modelling, since refining a mesh in appropriate zones brings the Peclet number down when the incompressible isothermal turbulent flow is simulated.

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Section: Related Workmentioning

confidence: 99%

Effects of Mesh Generation on Modelling Aluminium Anode Baking Furnaces

Libreros

Trujillo

2021

Fluids

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“…However, these 2D models just focused on the heat transfer along the flowing direction of flue gas, but ignored the heat transfer in the perpendicular direction. Two coupled submodels were proposed by Oumarou et al 27,28 which involved several phenomena including heat conduction, convection, radiation and, volatile release for the horizontal ring furnace. But the effect of transient heat transfer was not considered in these studies.…”

Section: Low Efficiency and High Energy Consumption During The Bakimentioning

confidence: 99%

Structural and thermal analysis of an innovative baking furnace for carbon anode production

2020

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The urgent demands for the high efficiency and low consumption of carbon anode baking process stimulate the structure optimization of the baking furnace. In this paper, a closed-top innovative anode baking furnace (CTABF) with periodically arranged burners and anode crucibles is proposed, and the thermal process in the CTABF is studied via a coupled multi-physics model and the in situ measurement. Results show that the multi-channel design changes the one-way high-temperature flue gas path and increases its residence time in the furnace, while the temperature distributions in the inner and outer crucibles show good uniformity. The average convective heat flux accounts for about 68% of the total heat flux around the crucible surface, and thus the baking rate of anodes can be controlled by adjusting the power of driven fan. Therefore, due to the above structural retrofits, the baking time and energy consumption are reduced and the baking quality is improved, showing the superiority of the proposed CTABF over the traditional ABF.

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“…In the anode baking furnace (ABF) process modeling, a simplistic approach is adopted. These models are sufficient for estimating the overall performance of the furnace [1][2][3]. However, it is incredibly challenging to employ ABF process models to perform transient turbulent combustion simulations.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Critical Operational Parameters on the Performance of the Aluminum Anode Baking Furnace

Tajik

Shamim

Ghoniem

et al. 2020

Journal of Energy Resources Technology

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Minimizing energy consumption and reducing pollutant emissions during the carbon anode baking process is critically important for the aluminum industry. The present study investigates the effects of oxidizer inlet temperature, inlet oxygen concentration, equivalence ratio, refractory wall thermal conductivity, and refractory wall emissivity on the baking process using URANS-based simulations in conjunction with the presumed probability density function method. Numerical results are combined with a response surface methodology (RSM) to optimize the anode baking process. The advantage of the coupled method is that it can adequately provide information on interactions of different input parameters. It is remarked that the significance level of the studied parameters varies drastically for different outputs. It is noted that diluting inlet oxygen concentration (from 23% in atmospheric air to 15%) at an elevated oxidizer temperature leads to enhanced furnace fuel efficiency, more uniform temperature distribution, and lower pollutant emissions. A linear model is detected to be adequate for response surface modeling of the anode baking furnace NOx formation. On the other hand, furnace soot formation is modeled with a higher-order model due to the quadratic behavior of the response.

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Transient process model of open anode baking furnace

Cited by 11 publications

References 8 publications

Effects of Mesh Generation on Modelling Aluminium Anode Baking Furnaces

Effects of Mesh Generation on Modelling Aluminium Anode Baking Furnaces

Structural and thermal analysis of an innovative baking furnace for carbon anode production

The Impact of Critical Operational Parameters on the Performance of the Aluminum Anode Baking Furnace

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