The influence of operational parameters on the axial transport behavior of a bidisperse particle assembly of spherical particles in rotary kilns

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-04 DOI:10.1016/j.powtec.2025.120739

Haozhi Jie, Fabian Herz

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Abstract

In a bidisperse particle system, a mathematical model based on the segregation induced ring-core structure was established and applied to calculate the residence time and the axial velocity of particles of different sizes within a rotary kiln. Additionally, validation experiments were conducted in a pilot-scale rotary kiln using particles of 2 mm and 4 mm size as experimental materials. The entire process was recorded by observing the transport of the tracer particles from the inlet to the outlet. Additionally, the average axial velocity of each type of particle in each region of the kiln can be obtained. At the outlet, the tracer particles were collected and analyzed based on statistics and diffusion theory. The experimental data were converted into residence time distribution (RTD) formulas, and corresponding mean residence time (MRT), variance, axial dispersion (Dz), and Peclet number (Pe) were derived. The MRT obtained from the experiments is in accordance with the results calculated by the mathematical ring-core structure model, thereby proving the effectiveness and accuracy of the mathematical model presented in this paper. Moreover, the influence of the rotary kiln rotational speed, inclination angle, and feed mass flow rate on MRT and RTD is validated by the experiments. Based on the analysis of particle motion within the kiln, the impact of different transversal motion modes on segregation was also verified.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.