Journal
POWDER TECHNOLOGY
Volume 333, Issue -, Pages 404-409Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2018.04.018
Keywords
Narrow size-ash coal; Energy-size reduction model; Breakage behavior; Response of energy consumption
Categories
Funding
- National Natural Science Foundation of China [51574234]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Breakage behaviors and energy consumed characteristics of coal are directly influenced by properties, such as particle size, ash content or density. It is essential to model these effects and conduct quantitative evaluation. In this study, samples of 4 particle sizes x 4 ash contents were ground in a Hardgrove mill for 9 energy levels, respectively. Breakage rate of particles in the top size and t(10) were determined and effects of coal properties on two parameters were also discussed. Though the relation between consumed energies and t(10) of each sample can be described by classical breakage model, experimental data of all samples were scatter. In this case, particle size and ash content were modelled into breakage equation in exponential term, namely t(10) = A x (1-e(-b.x.Ecs/eYa)). This modified model gave good fitting results to experimental data. Introduce of coal properties into energy-size reduction model helps to compare grinding energy efficiency of various coals. Confidence analyses of repeat experiments demonstrated the repeatability of test results and indicated the reliability of new breakage model. (C) 2017 Elsevier B.V. All rights reserved.
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