Measurement Methodology to Characterize Permittivity-Mass Concentration Relations of Aerated Bulk Materials

Suppan, Thomas; Neumayer, Markus; Bretterklieber, Thomas; Wegleiter, Hannes; Puttinger, Stefan

doi:10.1109/i2mtc50364.2021.9460057

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…As the dielectric properties of material can depend on the frequency, the use of a measurement technique with a continuous AC excitation is relevant, as it was addressed in section 2. Details about this procedure including an uncertainty assessment are presented in [59]. This also includes reference measurements using particle image velocimetry (PIV) to verify the correct aeration state of the powder.…”

Section: Determination Of Spatial Mass Density and Mass Flow Rate Mea...mentioning

confidence: 99%

ECT in a large scale industrial pneumatic conveying system

Neumayer,

Bretterklieber,

Suppan

et al. 2024

Meas. Sci. Technol.

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The application of electrical capacitance tomography (ECT) for monitoring of industrial processes has been studied and proposed by many researchers. Examples can be found in monitoring of multiphase flows or mixing processes in reactors. Demonstrations of the functionality based on lab and test rig measurements have proven the potential of the proposed principles. This paper discusses the application of an ECT system in a heavy industries application. The harsh operating conditions in the industrial environment pose several challenges for the application of sophisticated measurement technology. This work addresses key aspects for the application of an ECT measurement system in such an environment. Specifically the electrical system design and the influence of the temperature are addressed. Relevant parameters and possible solutions are discussed. Furthermore the application of ECT as instrument for mass flow metering in pneumatic conveying processes is addressed. Supportive measurement studies from test rig experiments and comparative simulation studies are presented. Therefore, the paper provides a concise discussion on the application of ECT under harsh operating conditions, as well as the use of ECT as a measurement device for process measurement. The work concludes with a presentation of a measurement system in an industrial plant in which the proposed concepts were succesfully implemented.

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Section: Determination Of Spatial Mass Density and Mass Flow Rate Mea...mentioning

confidence: 99%

ECT in a large scale industrial pneumatic conveying system

Neumayer,

Bretterklieber,

Suppan

et al. 2024

Meas. Sci. Technol.

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“…The purpose of the material model is to describe the relationship between the mass concentration and the relative permittivity of aerated bulk materials, as they occur within pneumatic conveying processes. A suitable model, which describes this relationship is the Landau–Lishitz–Looyenga (LLL) Equation [ 19 , 20 ]. For a two component particle gas mixture, the LLL equation is given by:

…”

Section: Holistic Modeling Of the Measurement Processmentioning

confidence: 99%

“…In [ 31 ], a dedicated coaxial probe was demonstrated with the feature to aerate the material sample by means of an axial gas stream. Based on this probe a measurement methodology was presented in [ 19 ] to characterize the

relationship for aerated powders. Hereby, Equation ( 3 ) is simplified to:

where

is a model parameter, which is determined from impedance measurements of the coaxial probe.…”

Section: Holistic Modeling Of the Measurement Processmentioning

confidence: 99%

“…For PP pellets the parameter was determined to be

. Details about the coaxial probe and the measurement procedure to determine

can be found in [ 19 , 31 ].…”

Section: Holistic Modeling Of the Measurement Processmentioning

confidence: 99%

“…The sensors used for this approach typically offer a larger number of sensing electrodes. Afterwards the spatial mass concentration is determined based on material models [ 19 , 20 ]. ECT techniques also enable the estimation of the spatial velocity field [ 21 , 22 ], wherewith Equation ( 1 ) can be approximately evaluated from the measurement data, in order to determine

.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Model-Based Analysis of Capacitive Flow Metering for Pneumatic Conveying Systems: A Comparison between Calibration-Based and Tomographic Approaches

Suppan

Neumayer

Bretterklieber

et al. 2022

Sensors

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Pneumatic conveying is a standard transportation technique for bulk materials in various industrial fields. Flow metering is crucial for the efficient and reliable operation of such systems and for process control. Capacitive measurement systems are often proposed for this application. In this method, electrodes are placed on the conveyor systems transport line and capacitive signals are sensed. The design of the sensor with regard to the arrangement and the number of electrodes as well as the evaluation of the capacitive sensor signals can be divided into two categories. Calibration-based flow meters use regression methods for signal processing, which are parametrized from calibration measurements on test rigs. Their performance is limited by the extend of the calibration measurements. Electrical capacitance tomography based flow meters use model-based signal processing techniques to obtain estimates about the spatial material distribution within the sensor. In contrast to their calibration-based counterparts, this approach requires more effort with respect to modeling and instrumentation, as typically a larger number of measurement signals has to be acquired. In this work we present a comparative analysis of the two approaches, which is based on measurement experiments and a holistic system model for flow metering. For the model-based analysis Monte Carlo simulations are conducted, where randomly generated pneumatic conveying flow patterns are simulated to analyze the sensor and algorithm behavior. The results demonstrate the potential benefit of electrical capacitance tomography based flow meters over a calibration-based instrument design.

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