Flow properties and inter-particle forces in fuel powders--颗粒学报PARTICUOLOGY

Liu, Y., Lu, H., Poletto, M., Guo, X., Gong, X., & Jin, Y. (2017). Flow properties and inter-particle forces in fuel powders. Particuology, 34, 24-38. https://doi.org/10.1016/j.partic.2016.10.007

Flow properties and inter-particle forces in fuel powders

Yi Liu ^a, Haifeng Lu ^a, Massimo Poletto ^b, Xiaolei Guo ^a, Xin Gong ^a *, Yong Jin ^a

a Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China
b Dipartimento di Ingegneria Industriale, Universita degli Studi di Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, SA, Italy

10.1016/j.partic.2016.10.007

Volume 34, October 2017, Pages 24-38

Received 26 August 2016, Revised 13 October 2016, Accepted 20 October 2016, Available online 7 April 2017, Version of Record 12 August 2017.

E-mail: gongxin@ecust.edu.cn

Highlights

• A modified model "rough stiff particles with soft contacts" was proposed.

• Acceptable agreement was found between the predicted and measured tensile strength.

• The bulk flow properties of fuel powders were analyzed in view of micro contacts mechanics.

Abstract

This work studied the mechanical properties of a series of industrial fuel powders: bituminite, lignite, and petroleum coke. Sieved cuts of these powders were assessed and the flow properties of each sample were used to calculate tensile strengths as functions of consolidation stress. In addition, BET surface areas and dispersive surface energies were estimated from surface energy analysis. To analyze the bulk flow properties of these fuel powders in terms of micro-contact mechanics, the fundamentals of fuel powder adhesion and consolidation were reconsidered based on the "stiff particles with soft contacts" model proposed by Tomas. In the present work, a multi-contact concept was introduced to account for the irregular shapes of actual particles. This modified model was based on elastic–plastic contact deformation theory and was employed to describe the contact between rough particles and to estimate the associated inter-particle forces. The results were used in conjunction with the Rumpf approach to relate the isostatic tensile strength to the degree of consolidation. Applying average values for the powder compressibility parameters allowed the model to be used for predictive purposes, and an acceptable level of agreement was found between predicted and measured tensile strengths.

Graphical abstract

Keywords

Fuel powder; Flow property; Inter-particle force

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