Review of certain key issues in indirect measurements of the mass flow rate of solids in pneumatic conveying pipelines |
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Authors: | Yingna Zheng Qiang Liu |
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Affiliation: | 1. School of Engineering and Computing, Glasgow Caledonian University, Glasgow G4 0BA, UK;2. School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, PR China;3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, PR China |
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Abstract: | On-line mass flow measurement of particulate solids in pneumatic conveying pipeline is a technically challenging area, where mass flow measurement presents a range of problems. These problems are not normally relevant to a single phase flow, but are always involved in gas–solids two-phase flows, like inhomogeneous distribution of solids over the pipe cross section, irregular velocity profiles, variations in particle size, moisture content, and deposition of fine particles on the inner wall of the pipeline. These variables may affect the response of a solids flow meter in ill-defined ways. All of these make the design and the calibration of solids’ mass flowmeter more difficult. Based on a review of non-invasive mass flow measurements of particulate solids, this paper summarizes and highlights several key issues, which often rely on structures of sensors or measurement methods, in indirect mass flow metering of pneumatically conveyed solids. They are: (i) spatial filtering effect; (ii) averaging effect; (iii) measurement resolution and sensitivity of array structures in tomography sensors. |
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Keywords: | Gas&ndash solids two-phase flow Solids&rsquo mass flow rate measurement Spatial filtering effect Averaging effect Resolution and sensitivity |
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