2.3 - A new sensor concept to localize non-conducting void fractions in liquid metal based on the measured magnetic field

Event

17. Dresdner Sensor-Symposium 2024
2024-11-25 - 2024-11-27
Dresden

Band

Vortrag

Chapter

2. Bio- und Prozesssensorik

Author(s)

L. Krause, T. Wondrak, S. Eckert, K. Eckert - Helmholtz-Zentrum Dresden-Rossendorf,Dresden/D, N. Kumar, S. Gumhold - Technische Universität Dresden, Dresden/D

Pages

26 - 29

DOI

10.5162/17dss2024/2.3

ISBN

978-3-910600-04-1

Price

free

Abstract

Electrolytically produced hydrogen using renewable energy is a key energy carrier in transitioning to green energy. Hydrogen and oxygen as the desired products are evolving in form of gas bubbles during water electrolysis upon application of a current. However, the gas bubbles are not electrically conductive, block electrocatalytically active surface on the electrodes during their growth and thus reduce the overall efficiency [1]. Measurement techniques such as X-ray tomography can localize the gas bubbles [2], but the process to implement them in industrial electrolyzers is complex. Information about the distribution of electrical conductivity σ can be derived from the magnetic field generated outside the electrolyzer by the current inside the cell. Gradients of σ, such as those between electrolyte solution and gas bubbles, modify the distribution of the electric current density j, whose structure determine the shape of the magnetic flux density B.