Open Access

ARTICLE

CFD SIMULATION OF REACTIVE FLOW IN COUNTER FLOW SHAFT KILNS USING POROUS MEDIA MODEL

by

Institute of Fluid Dynamics and Thermodynamics, Otto von Guericke University, Magdeburg, Germany
* Corresponding author. Email: kamyar_m.pour@yahoo.de

Frontiers in Heat and Mass Transfer 2022, 19, 1-8. https://doi.org/10.5098/hmt.19.37

Abstract

The length of flame and behavior of the flame and homogenization in temperature distribution play the main roles to obtain a better quality of lime. Performing experiments in a real lime shaft kiln plant are quite complicated. A lime shaft kiln normally has a large geometry, including a height of 15 meters and a diameter of 3 meters, and is filled with large stones moving in a vertical direction. In most cases, the measuring instruments are damaged. Due to these difficulties, modeling of physical and chemical processes is required for having a better understanding of the process and optimizing the parameters. The current study attempts to demonstrate the viability of using computational fluid dynamics (CFD) as a design tool for such packed beds by visualizing the flow structure in the reacting zone. The porous media model (PMM) introduced as a method of simulations of Counter Flow Single (CFS) shaft kilns. The simulation result validates by experiment-packed bed measurements. The main objective of this research study is to illustrate the key parameters affecting the flame length such as the kiln diameter, number of burners and particle diameter in counter flow shaft kilns. Results showed that when the kiln diameter increased from 1m up to 4m, the flame length is decreased by about 0.8m. When the number of burners is increased by three times, the flame length is decreased by about 0.8m. When the particle diameter increased from 20mm up to 150mm (by approximately seven times), the flame length increased by about 0.8m.

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