Simulation of Gas-Solid Flow Characteristics in Three-Dimensional Rotational Spouted-Fluidized Bed

Abstract:

In order to study the gas-solid flow characteristics in a rotational spouted-fluidized bed dryer, the eulerian multi-phase model was applied in three-dimensional numerical simulation of a rotational spouted-fluidized bed to analyze the effect of different velocity ratios between bottom and tangential wind on gas and particle velocity distribution characteristics, and the change rule of gas-solid flow state with the time at the velocity ratio of 30 m·s^-1/30 m·s^-1 was derived. The results show that the increase of tangential wind velocity is propitious to enhance the gas flow rate in the region near the wall and make the gas-solid phase mix sufficiently as well as augment of the contact area of gas and particle phase, and decrease of the gas flow dead zones and the adhesion of viscous materials to cylinder wall. However, the negative pressure formed by the entrainment effect of tangential wind goes against the development of gas flow along the axial direction reducing the penetration effect of axial wind to the granular layer.

• Periodical: Applied Mechanics and Materials (Volumes 496-500)
• Pages: 913-917
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.496-500.913
• Online since: January 2014
• Authors: Xin Feng Long, Yi Liu, Bo Lou
• Keywords: Dry, Gas-Solid Flow Characteristics, Rotational Spouted-Fluidized Bed

References

[1] Wang Xiaojing, Li Lianbo. Numerical simulation and experimental study on rotational gas flow field in spout-fluidized bed[J]. Chemical Industry and Engineering, Vol. 24(4)(2007)：pp.321-324, 328.

[2] Xu Wensheng, Ma Zhigang, Fang Mengxiang. Numerical simulation of Gas-particle Hydrodynamics in CFB[J]. Power System Engineering, Vol. 27(6)(2011)：pp.6-8.

[3] Tian Fengguo, Zhang Mingchuan, Zhang Jian, et al. Quantitative evaluation of micro-mixing processes in fluidized beds[J]. Journal of Power Engineering, Vol. 27(1)(2007)：pp.45-49.

[4] Almuttahar, A, Taghipour, F. Computational fluid dynamics of a circulating fluidized bed under various fluidization conditions[J]. Chemical Engineering Science, Vol. 63(6)(2008): pp.1696-1709.

DOI: 10.1016/j.ces.2007.11.020

[5] Khongprom, P., Aimdilokwong, A., Limtrakul, S. et al. Axial gas and solids mixing in a down flow circulating fluidized bed reactor based on CFD simulation[J]. Chemical Engineering Science, Vol. 73(2012): pp.8-19.

DOI: 10.1016/j.ces.2012.01.020