Visualizing Electric Discharges and Backspray of Dust Layers in Electrofilters

Majid, Muhammad; Rojek, Adrian; Wiggers, Helmut; Walzel, Peter

doi:10.1002/cite.201000003

Cited by 6 publications

(1 citation statement)

References 7 publications

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“…This phenomenon is known in the literature and named back-corona. With increasing layer thickness at the collecting electrode, higher resistance is created -and thereby a higher potential drop in the particle layer [46,48,49]. However, much higher drug contents were obtained compared to previous investigations [38].…”

Section: Methodsmentioning

confidence: 84%

Preparation of Micron and Submicron Particles via Spray Drying and Electrostatic Precipitation

et al. 2022

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Small particles are of great interest in a variety of applications. Spray drying is a common technique for particle synthesis, but it is limited with respect to sizes below 10 μm. Therefore, a new laboratory-scale spray dryer was designed to address this issue. A novel aerosol generator consisting of a piezo crystal in a swirl chamber was designed to obtain droplets in the low micrometer range. After drying and cooling, particles were deposited in a molten carrier, using melt electrostatic precipitation. The median particle size of three pharmaceutical drug substances was 2 μm. The size distribution was particularly narrow, with span values of about 1.1. Spray drying is a sufficient technique to produce small drug particles below 5 μm with ultrasonic atomization at high frequencies. Electrostatic precipitation in a molten carrier is a suitable method to capture these particles.

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Section: Methodsmentioning

confidence: 84%

Preparation of Micron and Submicron Particles via Spray Drying and Electrostatic Precipitation

et al. 2022

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Influence of Thermodynamic, Material, and Bulk Properties on Electrical Resistivity of Particle Layers

2014

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Although the influence of gas humidity and particle size distribution on dust resistivity is well known, the impact of thermic and electric balancing periods on the measurement of dust resistivity is less familiar. The dust resistivity of quartz glass (SiO2) and Al2O3 particle layers was measured and exhibits a non‐ohmic behavior as well as time dependence seen in a similar manner during electret formation. However, constant values of dust resistivity for the test dust were first measured after a rather long balancing period which cannot be explained in whole by adsorption and desorption kinetics of H2O into the particle layers. Rather, it could be presumed that the thermic and electric balancing periods overlap, whereas the electric balancing periods take a much longer time.

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The Electrical Properties of Highly Resistive Dusts

Riebel

Aleksin

Vora

2012

Chemie Ingenieur Technik

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Hochohmige Stäube zeigen ein ausgeprägtes nicht‐ohmsches Verhalten. Die als spezifischer elektrischer Widerstand bekannte Messgröße ist stark abhängig von der Schichtdicke und der Polarität der Hochspannung. Der Stromstransport findet durch Überschussladungen beider Polaritäten statt, die zu hohen Raumladungsdichten führen und starke elektrostatische Felder induzieren. Die beobachteten Effekte können als Elektret‐Effekte interpretiert werden. Zur Untersuchung des elektrischen Verhaltens wurden hochohmige Staubschichten innerhalb einer Spitze‐Platte‐Anordnung einem elektrischen Feld mit überlagerter Korona‐Entladung ausgesetzt.

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Visualizing Electric Discharges and Backspray of Dust Layers in Electrofilters

Cited by 6 publications

References 7 publications

Preparation of Micron and Submicron Particles via Spray Drying and Electrostatic Precipitation

Preparation of Micron and Submicron Particles via Spray Drying and Electrostatic Precipitation

Influence of Thermodynamic, Material, and Bulk Properties on Electrical Resistivity of Particle Layers

The Electrical Properties of Highly Resistive Dusts

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