Development of a pilot roller test machine for investigating the pulverizing performance of particle beds |
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| Affiliation: | 1. State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, PR China;2. Nagasaki Research & Development Centre, Mitsubishi Heavy Industries, Ltd., Nagasaki, Japan;1. SLR Consulting Ltd, Treenwood House, Rowden Lane, Bradford on Avon, Wilts BA15 2AU, UK;2. SLR Consulting Ltd, Langford Lodge, 109 Pembroke Rd, Bristol BS83EU, UK;1. Advanced Analysis & Computation Center, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;2. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;3. Julius Kruttschnitt Mineral Research Centre, The University of Queensland, Brisbane, Queensland 4068, Australia;4. Beijing Power Equipment Group, Fangshan, Beijing 102400, China;5. College of Zijin Mining, Fuzhou University, Fuzhou, Fujian 350000, China;6. Mining and Minerals Engineering Department, Virginia Tech, Blacksburg, VA 24060, USA;1. College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China;2. Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164-6120, USA;1. Universidade Federal do Rio Grande do Sul (UFRGS), Department of Mining Engineering – PPG3M-LTM, Av. Bento Gonçalves, 9500, Prédio 75, Sala 124, Porto Alegre, RS, Brazil;2. Centro de Tecnologia Mineral - CETEM/MCTI, Rio de Janeiro, Brazil;1. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;2. Advanced Analysis & Computation Center, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;3. Julius Kruttschnitt Mineral Research Centre, The University of Queensland, Brisbane, Queensland 4068, Australia;4. Beijing Power Equipment Group, Fangshan, Beijing 102400, China;5. Mining and Minerals Engineering Department, Virginia Tech, Blacksburg, VA 24060, USA |
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| Abstract: | Various types of pulverizers are commonly used in power plants for the purpose of breaking coal particles into fine powders to achieve optimum combustion for the boilers. To investigate the effects of factors that may influence the pulverizing efficiency, this study presents the development of a pilot roller test machine, which can significantly simplify the grinding conditions in actual pulverizers whilst the key variables involved in a rolling compression can be considered. The monitoring and data acquisition systems allow real-time monitoring of the pulverizing induced roller movements. Through parametric numerical analyses on an elastic feed bed of 5–30 mm in thickness and 500–1000 MPa in elastic modulus, it is found that the machine is capable of providing a maximum contact pressure stress in a range of 4.5–17.5 MPa. A series of fundamental tests have been conducted by the developed machine using a type of bituminous coal and typical bound values of roller weight and speed. The size reduction results as well as the measurements of roller movement demonstrate the capability of the machine as a suitable tool for testing grinding performance. Some discussions of the potential extension of the machine are also given in the final part. |
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| Keywords: | Roller test machine Particle bed Breakage Grinding Size reduction |
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