Bulk flow properties of fly ashes at ambient and high temperature  

作　　者：Yi Liu Haifeng Lu Diego Barletta Massimo Poletto Xiaolei Guo Xin Gong YongJin 

机构地区：[1]Key Laboratory of Coal Gasification and Energy Chemical Engineering of the 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 [2]Dipartimento di lngegneria lndustriale, Universita degli Studi di Salerno, Via Giovanni Paolo II, 132,1-84084 Fisciano, SA, Italy

出　　处：《Particuology》2018年第3期113-125,共13页颗粒学报（英文版）

摘　　要：The bulk flow properties of four different fly ashes were assessed at ambient temperature and at 500 ~C, using a high temperature annular shear cell. These powders all resulted from industrial processes and had similar chemical compositions but different particle size distributions. Applying a high temperature was found to increase the powder cohesion, with this effect being more significant in the case of the sample with the highest proportion of fines. To better understand the effect of temperature on the bulk flow properties of these materials, a model previously proposed by some of the authors was used to correlate the powder isostatic tensile strength with the interparticle forces and microscale particle contact struc- ture. This model combines the continuum approach with description of particle-to-particle interactions. A comparison with experimental data indicated that the effects of consolidation and temperature on the tensile strength of the fly ashes were correctly described by the model. This theoretical approach also elucidates the mechanism by which the temperature affects the bulk flow properties of fly ashes through modifications of the microscale intemarticle contacts.The bulk flow properties of four different fly ashes were assessed at ambient temperature and at 500 ~C, using a high temperature annular shear cell. These powders all resulted from industrial processes and had similar chemical compositions but different particle size distributions. Applying a high temperature was found to increase the powder cohesion, with this effect being more significant in the case of the sample with the highest proportion of fines. To better understand the effect of temperature on the bulk flow properties of these materials, a model previously proposed by some of the authors was used to correlate the powder isostatic tensile strength with the interparticle forces and microscale particle contact struc- ture. This model combines the continuum approach with description of particle-to-particle interactions. A comparison with experimental data indicated that the effects of consolidation and temperature on the tensile strength of the fly ashes were correctly described by the model. This theoretical approach also elucidates the mechanism by which the temperature affects the bulk flow properties of fly ashes through modifications of the microscale intemarticle contacts.

关 键 词：Fly ash High temperature annular-shear cell Flow model Isostatic tensile strength Interparticle force 

分 类 号：TQ113.254[化学工程—无机化工] TS246.57[轻工技术与工程—制糖工程]