A Novel Apparatus for Simultaneous Laser-Light-Sheet Optical Particle Counting and Video Recording in the Same Measurement Chamber at High Temperature.

Julian Zoller,Uwe Janoske,Achim Dittler,Jörg Meyer,Amin Zargaran,Kamil Braschke

doi:10.3390/s22041363

Julian Zoller, Uwe Janoske + Show 4 more

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https://doi.org/10.3390/s22041363

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Abstract

A novel apparatus was developed, to investigate the detachment of particle structures consisting of soot and ash from a single fibre or a fibre array in hot gas flow. Key features of the novel apparatus are operation at high temperatures while two different measurement techniques are applied simultaneously in the same measurement chamber to observe particle structure detachment from a loaded fibre array. A heated inlet can heat the air stream at the position of the fibre array up to 470 °C, allowing detachment investigations at temperatures relevant for the operation of, e.g., soot particle filters. The first measurement technique integrated in the setup is video recording of the fibre array, which gives qualitative information on the rearrangement or detachment of particulate matter on the fibre. Because it is often difficult to distinguish rearrangement and detachment from pure visual observations, a second measurement technique is applied. This technique is a laser-light-sheet optical particle counter, which can detect detached particle structures and determine their size. The measurable size range is 257 to 1523 µm for glass spheres. This paper presents and discusses the novel apparatus, its calibration and first detachment measurement results.

Highlights

Deposition of reactive and inert particles on filter media or technical equipment is observed in many applications such as the treatment of exhaust gas [1] or synthesis gas [2,3].The collectors on which those deposits are formed are often cylindrical, for instance the cylindrical fibres in depth filters
This study showed an influence of the temperatureon the on thedetachment detachmentprocess processeven evenwithout withoutreaction
The present study shows an advancement of the laser-light-sheet optical particle counter (LLS-OPC) presented by Wurster et al With the new apparatus, videos of the observed object can be captured simultaneously in the Sensors 2022, 22, x FOR PEER REVIEW

Summary

Introduction

Deposition of reactive and inert particles on filter media or technical equipment is observed in many applications such as the treatment of exhaust gas [1] or synthesis gas [2,3]. The collectors on which those deposits are formed are often cylindrical, for instance the cylindrical fibres in depth filters. Detachment of particulate deposits from the collector can occur due to flow forces. This detachment can be intended in a cleaning or regeneration process but can be unintentional for example during particle separation in a fibrous depth filter. Reaction and disappearance of a particle structure component, for example the oxidation of soot, can change the deposited particle structure and the detachment [4].

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