Numerical Simulations of Combustion and Decomposition Processes in Precalciner with Two Different Heights of Raw Meal Inlets

Shu Xia Mei; Jun Lin Xie; Feng He; Ming Fang Jin

doi:10.4028/www.scientific.net/AMM.268-270.477

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 268-270Numerical Simulations of Combustion and...

Numerical Simulations of Combustion and Decomposition Processes in Precalciner with Two Different Heights of Raw Meal Inlets

Abstract:

To reduce energy consumption, numerical simulations of combustion and decomposition processes in a precalciner were carried out with two different heights of raw meal inlets. In Euler coordinate system the gas phase is expressed with k-ε two-equation model, in Lagrange coordinate system the solid phase is expressed with discrete phase model (DPM), the chemical reaction is expressed with species transport model, and the radiation is expressed with P1 radiation model. The results show that when the raw meal inlets are near the jetting coal pipes, there is much better dispersing condition of CaCO3 but a much poorer coal combustion condition, resulting in a much higher CaCO3 decomposition rate but a lower coal burn-off rate than that when the raw meal inlets are far away from the jetting coal pipes. It is advised to install both the two heights of raw meal inlets in order to obtain not only high CaCO3 decomposition rate but also high coal burn-off rate.

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Periodical:

Applied Mechanics and Materials (Volumes 268-270)

Pages:

477-482

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.268-270.477

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Online since:

December 2012

Authors:

Shu Xia Mei, Jun Lin Xie, Feng He, Ming Fang Jin

Keywords:

Coal Combustion, Numerical Simulation, Precalciner, Raw Meal Inlet, Thermal Decomposition of Calcium Carbonate

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