Velocity characterization of dense phase pneumatically conveyed solid particles in horizontal pipeline through an integrated electrostatic sensor

Li, Jian; Fu, Feifei; Shu, Li; Xu, Chen; Wang, Shimin

doi:10.1016/j.ijmultiphaseflow.2014.11.004

Cited by 17 publications

(11 citation statements)

References 24 publications

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“…Pneumatically conveyed solid particles are charged due to friction and collisions between the particles and the pipe wall, which is one of the inherent characteristics of gas-solid flows. Based on particle charging, various electrostatic sensors have been developed for particle flow parameter measurement [ 9 , 10 , 11 , 12 , 13 , 15 , 16 , 17 ], especially for the particle velocity measurement when combined with a cross-correlation signal processing algorithm. Two identical electrostatic sensors are essential for the cross-correlation velocity measurement and are usually arranged on the pipe with a certain axial spacing ( L ).…”

Section: Measurement Principlementioning

confidence: 99%

“…A variety of advanced measurement techniques have been investigated and developed for the flow measurement of pneumatically conveyed solid particles based on different sensing principles [ 1 ], such as optical [ 2 , 3 ], digital imaging [ 4 , 5 ], acoustic [ 6 , 7 ], radiometric [ 8 ] and electric methods [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Among them, optical, digital imaging and acoustic techniques are capable of dilute phase particle flow measurement.…”

Section: Introductionmentioning

confidence: 99%

“…Electric methods, mainly including electrostatic and capacitance sensing techniques, have been increasingly attractive due to their advantages of non-invasiveness, simple structure, low-cost, high reliability and non-radiation technology. Great advances have been made in particle velocity measurement in gas-solid flow by using electrostatic sensors along with signal processing algorithms such as cross-correlation [ 10 , 11 , 12 , 13 , 14 ] and spatial filtering [ 15 , 16 , 17 ] techniques, and encouraging results have been obtained in both laboratory and field experiments. On the other hand, the capacitance method has been successfully used for the phase concentration measurement in gas-liquid and gas-solid two-phase flows with optimized sensor structures [ 18 , 19 ] based on the variations of equivalent electricalpermittivitywith different phase concentrations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Integrated Instrumentation System for Velocity, Concentration and Mass Flow Rate Measurement of Solid Particles Based on Electrostatic and Capacitance Sensors

Kong

et al. 2015

Sensors

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The online and continuous measurement of velocity, concentration and mass flow rate of pneumatically conveyed solid particles for the high-efficiency utilization of energy and raw materials has become increasingly significant. In this paper, an integrated instrumentation system for the velocity, concentration and mass flow rate measurement of dense phase pneumatically conveyed solid particles based on electrostatic and capacitance sensorsis developed. The electrostatic sensors are used for particle mean velocity measurement in combination with the cross-correlation technique, while the capacitance sensor with helical surface-plate electrodes, which has relatively homogeneous sensitivity distribution, is employed for the measurement of particle concentration and its capacitance is measured by an electrostatic-immune AC-based circuit. The solid mass flow rate can be further calculated from the measured velocity and concentration. The developed instrumentation system for velocity and concentration measurement is verified and calibrated on a pulley rig and through static experiments, respectively. Finally the system is evaluated with glass beads on a gravity-fed rig. The experimental results demonstrate that the system is capable of the accurate solid mass flow rate measurement, and the relative error is within −3%–8% for glass bead mass flow rates ranging from 0.13 kg/s to 0.9 kg/s.

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Section: Measurement Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Integrated Instrumentation System for Velocity, Concentration and Mass Flow Rate Measurement of Solid Particles Based on Electrostatic and Capacitance Sensors

Kong

et al. 2015

Sensors

Self Cite

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“…In summary, although a significant amount of efforts go into investigating flow regimes transition in pneumatic conveying system, there is still no general theoretical method to predict the material conveying mode in the real pneumatic conveying process and supply useful guidance for design and operation of pneumatic conveying process. Therefore, more and more new detection methods, such as tomography, electrical method and acoustic method, were developed to detect the flow regimes and flow regimes transition. On one hand, developing new measurements can promote the research of flow regimes and flow regimes transition, on the other hand, new real‐time and on‐line detection method can guarantee the stable operation of pneumatic conveying system.…”

Section: Introductionmentioning

confidence: 99%

“…Electrical method collects the electrostatic signals during the conveying, which contain a large amount of particle motion information. Thus, it can be used to detect movement speed of particles . However, application of this method is only limited to these cases in which electrostatics exist.…”

Section: Introductionmentioning

confidence: 99%

Flow regime identification in horizontal pneumatic conveying by nonintrusive acoustic emission detection

et al. 2019

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This work investigated flow regimes identification in horizontal pneumatic conveying from the scope of particle motions based on acoustic emission detection. Results showed that the variation of acoustic energy and acoustic energy fraction could be used to identify the transition between suspension flow and stratified flow. Near the transition point, the acoustic energy was maximum, and the energy fraction of particle‐wall collision mutated at high mass fluxes. Furthermore, the fluctuation distribution index (FI) was constructed learning from the concept of polymer molecular weight distribution index, and the “circumferential fluctuation difference (D)” was defined. Based on this, new identification criteria and flow regime diagram were established. In suspension flow, D >0. In stratified flow, D <0. While in slug flow, D ≈ 0. According to these criteria, flow regimes can be identified independently of changing trends of measurement parameters. The universality of above criteria was further verified under different operating conditions.

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Experimental study of the effect of inclination angle on the minimum conveying velocity and the underlying mechanisms

et al. 2019

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This work investigated the effect of inclination angle on the minimum conveying velocity and the underlying mechanisms. Results showed that the pressure drop increased first and then decreased with the increasing inclination angle at the same mass flux and superficial gas velocity. The changing trend of minimum conveying velocity (u min) and the pressure drop near it can be divided into two types by taking 45 as the boundary, which was consistent with the difference in flow regimes near u min at different inclination angles based on results of high-speed photography and acoustic emission detection. Furthermore, the pressure drop was decomposed to investigate the underlying mechanism of the changing trend of u min. Results showed that the changing trend of u min was closely related to the particle velocity and the particle velocity obtained by high-speed photography was in good agreement with the theoretical analysis. K E Y W O R D S inclined pneumatic conveying, minimum conveying velocity (u min), particle motion characteristic, pressure drop

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Velocity characterization of dense phase pneumatically conveyed solid particles in horizontal pipeline through an integrated electrostatic sensor

Cited by 17 publications

References 24 publications

An Integrated Instrumentation System for Velocity, Concentration and Mass Flow Rate Measurement of Solid Particles Based on Electrostatic and Capacitance Sensors

An Integrated Instrumentation System for Velocity, Concentration and Mass Flow Rate Measurement of Solid Particles Based on Electrostatic and Capacitance Sensors

Flow regime identification in horizontal pneumatic conveying by nonintrusive acoustic emission detection

Experimental study of the effect of inclination angle on the minimum conveying velocity and the underlying mechanisms

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