Hazards due to electrostatic charging of powders

Glor, Martin

doi:10.1016/0304-3886(85)90041-5

Cited by 106 publications

(54 citation statements)

References 21 publications

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“…Respectively, a test on ESD ignition sensitivity of powders is widely used to gauge properties of many powdered materials [1][2][3][4][5][6][7][8][9]. Most ESD ignition standards employ sparks produced by discharge of a high-voltage capacitor, e.g., [10].…”

Section: Introductionmentioning

confidence: 99%

Ignition of aluminum powders by electro-static discharge

Beloni¹,

Dreizin²

2010

Combustion and Flame

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Section: Introductionmentioning

confidence: 99%

Ignition of aluminum powders by electro-static discharge

Beloni¹,

Dreizin²

2010

Combustion and Flame

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“…One well known case involves fluidized beds for polymer synthesis, where the heat liberated by polymerization reaction causes the particles adhered to the walls to fuse into sheets (Hendrickson, 2006). In some extreme cases, electrostatic charging can lead to explosions --when the charge is sufficiently large, gas breakdown occurs, resulting in a spark, and the dispersal of fine particles creates a highly flammable mixture (Glor, 1985;Nifuku et al, 1989). In pharmaceutical formulations, electrostatic charge can cause agglomeration or segregation of particles during blending operations (Murtomaa, 2004;Mehrota et al, 2007;Pu et al, 2009, Pingali et al, 2009, which can lead to problems with delivery of the medicine (Stainforth, 1994).…”

Section: Introductionmentioning

confidence: 99%

Triboelectric charging in single-component particle systems

Lacks

Sankaran

2015

Particulate Science and Technology

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Particulate systems are prone to electrostatic charging which has important implications on a number of technological areas and natural occurrences. The charging of particles in both of these contexts is the result of an age-old phenomenon known as triboelectric charging that describes the transfer of charged species between material surfaces due to contact or rubbing. In comparison to bulk materials, particle systems are characterized by several unique aspects that make this area of study particularly challenging including their inherently large surface to volume ratios which make them more susceptible to charging and their low mass which can lead to their lifting when electric forces exceed gravitational forces. Perhaps most curious is the universal observation of charge segregation for particles of the same material where there is no clear driving force for charge transfer. In this review, we present a summary of key issues and recent progress relating to triboelectric charging of particle systems, including potential mechanisms for charge transfer, how collision dynamics plays a role, and theoretical and experimental support for charge segregation.

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“…Electrostatic charge generation and accumulation on insulated particles are almost unavoidable due to repeated particle-particle and particle-wall frictions in the gas-solid fluidized bed. An excess accumulation of electrostatic charges will cause problems such as wall sheeting [2], particle agglomeration [3,4], and even spark generation or explosion hazards [5][6][7]. The generation and variation of electrostatic charge signals are significantly affected by bubble and particle motions inside the fluidized bed, which contain much dynamic information related to hydrodynamic behaviors.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors

Yang

Zhang

et al. 2017

Powder Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P TACCEPTED MANUSCRIPT Electrostatic charge signals in the fluidized bed contain much dynamic information on particle motions, which are poorly understood and explored. In this work, correlation velocities of Geldart B and D particles were measured, analyzed and compared by induced electrostatic sensors combined with cross-correlation method in the fluidized bed. The results indicated that the average correlation velocity of particle clouds increased and the normalized probability density distributions of correlation velocities broadened when the superficial gas velocity increased in the dense-phase region. Both upward and downward correlation velocities could be acquired in the dynamic bed level region. Under the same excess gas velocity, the average correlation velocity of Geldart D particles was significantly smaller than that of Geldart B particles, which was caused by the smaller bubble sizes caused by the dominant bubble split over coalescence and less volume of A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2 gas forming bubbles for Geldart D particles. The experimental results verified the reliability and repeatability of particle correlation velocity measurement by induced electrostatic sensors in the gas-solid fluidized bed, which provides definite potential in monitoring of particle motions.

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Hazards due to electrostatic charging of powders

Cited by 106 publications

References 21 publications

Ignition of aluminum powders by electro-static discharge

Ignition of aluminum powders by electro-static discharge

Triboelectric charging in single-component particle systems

Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors

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