Particle size distribution in a granular bed filter--颗粒学报PARTICUOLOGY

Du, J., Liu, C., Yin, S., Rehman, A., Ding, Y., & Wang, L. (2021). Particle size distribution in a granular bed filter. Particuology, 58, 108-117. https://doi.org/10.1016/j.partic.2021.01.016

Particle size distribution in a granular bed filter

Jianping Du ^a, Chuanping Liu ^{a b}, Shaowu Yin ^{a b}, Ali Rehman ^a, Yulong Ding ^c, Li Wang ^{a b *}

a School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
b Beijing Key Laboratory of Energy Saving and Emission, Reduction in Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China
c Birmingham Centre for Energy Storage & School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

10.1016/j.partic.2021.01.016

Volume 58, October 2021, Pages 108-117

Received 3 November 2020, Revised 28 December 2020, Accepted 13 January 2021, Available online 18 March 2021, Version of Record 3 April 2021.

E-mail: liwang@me.ustb.edu.cn

Highlights

• A multilayer granular bed filtration system is developed.

• The particle size distribution of the dust trapped in the granular bed is analyzed.

• Large dust particles are more easily trapped by the granular bed.

• The larger the filtering granules, the more uniform the dust mass at all bed depths.

• Rapid inlet gas velocity promotes dust deposition on filter media deep in the bed.

Abstract

The effects of the filtering granule particle size and filtration superficial velocity on the dust particle size distribution in different layers of a granular bed system are discussed herein. A multilayer drawer granular bed filtration system was designed for these experiments based on filtering fly ash from a power plant. After a 1-h experiment, 47.8% of dust particles smaller than 2.5 μm, 63.7% of dust particles smaller than 10 μm, and 39.1% of dust particles larger than 10 μm were captured by the granular bed (corresponding to initial volume fractions of 6%, 19.3%, and 80.7%, respectively). Large dust particles were more easily trapped by the granular bed than small dust particles. Increasing the size of the filter granules and increasing the superficial velocity of the inlet flue gas were both effective ways to enhance the dust-holding capacity of the granular media throughout the granular bed.

Graphical abstract

Keywords

Granular bed; Multilayer filtration; Particle size distribution; Filtration superficial velocity

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