Improvement of Flow Velocity Measurement Algorithms Based on Correlation Function and Twin Plane Electrical Capacitance Tomography.

Volodymyr Mosorov,Marcin Zych,Dominik Sankowski,Robert Hanus,Ayoub Saoud

doi:10.3390/s20010306

Abstract

This article discusses the correlation method for time delay estimation, its disadvantages, and drawbacks. It is shown that the correlation method for material velocity measurement based on images of instantaneous changes of the concentration material inside measured by twin planes electrical tomography has serious limitations, especially in the case of plug regime. The basic problem is the non-stationarity of measured data, therefore the requirement of correlability of input data should be fulfilled. The requirement correlatability of input data imposes limitations on the possibility of continuous velocity measurement. This means that the material velocity can only be calculated when data are correlatable. An original algorithm of automatic extraction of the suitable time intervals to calculate material velocity is proposed. The algorithm allows measuring the flow velocity in a proper and accurate way. The examples of the correct velocity calculation, using the proposed concept for the gas-solid flow regime, are presented.

Highlights

The transportation of granular material is widely used in various applications, like mining, mineral, chemical, and pharmaceutical industries [1,2,3,4,5].Elaboration of a low-cost pneumatic transport system requires taking into consideration the influence of such parameters like velocity, material distribution, flow regime, etc., on its transport capacity.Maintaining low air pressure during granular material propagation is one of the basic criterions of the efficiency of such a transportation system
Multiphase flow investigation and metering require a combination of multiple technologies, sensors, and algorithms in order to provide reliable and effective solutions
Known methods for transit time measurements do not consider the choice of time intervals in their calculations

Summary

Introduction

The transportation of granular material is widely used in various applications, like mining (e.g., mining of polymetallic nodules), mineral, chemical, and pharmaceutical industries [1,2,3,4,5].Elaboration of a low-cost pneumatic transport system requires taking into consideration the influence of such parameters like velocity, material distribution, flow regime, etc., on its transport capacity.Maintaining low air pressure during granular material propagation is one of the basic criterions of the efficiency of such a transportation system. The transportation of granular material is widely used in various applications, like mining (e.g., mining of polymetallic nodules), mineral, chemical, and pharmaceutical industries [1,2,3,4,5]. Elaboration of a low-cost pneumatic transport system requires taking into consideration the influence of such parameters like velocity, material distribution, flow regime, etc., on its transport capacity. Maintaining low air pressure during granular material propagation is one of the basic criterions of the efficiency of such a transportation system. Real-time measurement of solid velocity in pneumatic transport can be useful for the improvement of the transportation efficiency of granular material. Invasive techniques require sensors inserted into the pipe and as a result, they disturb the material propagation and are exposed to abrasion over time. Laser and other optical methods have a limited scope of use, whereas safety standards must be considered in the case of the absorption techniques, which is based on radiation measurements

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