Energy loss at bends in the pneumatic conveying of fly ash |
| |
| Institution: | 1. Department of Mechanical Engineering, Thapar University, Patiala 147004, Punjab, India;2. Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong 2500, NSW, Australia;1. Department of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran;2. School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran;1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Multiphase Systems Research Lab, School of Chemical Engineering, College of Engineering, University of Tehran, P.O. Box 11155/4563, Tehran, Iran;2. Department of Chemical and Petroleum Engineering, University of Tabriz, P.O. Box 5166616471, Tabriz, Iran;1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. China National Coal Group Corporation, Beijing 100120, China;1. Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221008, China;2. Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;3. College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China |
| |
| Abstract: | An accurate estimation of the total pressure drop of a pipeline is important to the reliable design of a pneumatic conveying system. The present paper presents results from an investigation into the modelling of the pressure drop at a bend in the pneumatic conveying of fly ash. Seven existing bend models were used (in conjunction with solids friction models for horizontal and vertical straight pipes, and initial acceleration losses) to predict the total pipeline pressure drop in conveying fly ash (median particle diameter: 30 μm; particle density: 2300 kg/m3; loose-poured bulk density: 700 kg/m3) in three test rigs (pipelines with dimensions of 69 mm inner diameter (I.D.) × 168 m length; 105 mm I.D. × 168 m length; 69 mm I.D. × 554 m length). A comparison of the pneumatic conveying characteristics (PCC) predicted using the seven bend models and experimental results shows that the predicted total pipeline PCC and trends depend on the choice of bend model. While some models predict trends that agree with the experimental results, other models predicted greater bend pressure drops for the dense phase of fly ash than for the dilute phase. Models of Pan, R. (1992). Improving scale-up procedures for the design of pneumatic conveying systems. Doctoral dissertation, University of Wollongong, Australia, Pan, R., & Wypych, P.W. (1998). Dilute and dense phase pneumatic conveying of fly ash. In Proceedings of the sixth International Conference on Bulk Materials Storage and Transportation (pp. 183–189), Wollongong, NSW, Australia and Chambers, A.J., & Marcus, R.D. (1986). Pneumatic conveying calculations. In Proceedings of the second International Conference on Bulk Materials Storage and Transportation (pp. 49–52), Wollongong, Australia reliably predicted the bend losses for systems conveying fly ash over a large range of air flows. |
| |
| Keywords: | Pneumatic conveying Fluidised dense phase Bend Pressure drop Bend model |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
