A study on the static electrification of powders during pneumatic transportation and the ignition of dust cloud

Nifuku, Masaharu; Katoh, Hiromi

doi:10.1016/s0032-5910(03)00163-3

Cited by 96 publications

(34 citation statements)

References 7 publications

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“…This is due to the difficulty to quantify and reproduce experimentally real-world spark characteristics and especially sparks duration and synchronisation between dust dispersion and sparkover [6][7][8][9][10] (see discussion in Section 3.2). However, it is not possible to accurately qualify the ignition sensitivity of a sample according to the test result.…”

Section: Usual Interpretation Of Mie Resultsmentioning

confidence: 99%

MIKE 3 versus HARTMANN apparatus: Comparison of measured minimum ignition energy (MIE)

Janes

Chaineaux

Carson

et al. 2008

Journal of Hazardous Materials

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In this study, MIE values measured with two different explosion tubes, HARTMANN and MIKE 3, are compared. Generally, MIKE 3 apparatus provides MIE results, which are equal or lower to those measured with the HARTMANN apparatus; this is particularly true for the energy ranges between 1 and 10 mJ and higher than 100 mJ.Differences observed can modify samples classification according to their sensitivity to electrostatic ignition sources. Nevertheless, ignition of a dust cloud by an electrostatic discharge is complex, and implies a different mechanism from that occurring during MIE tests. Thus, it seems difficult to synchronise dust dispersion and spark triggering to obtain optimal concentration in the spark area. Moreover, spark characteristics such as duration or energy feeding rate of spark cannot reproduce exactly industrial-world ones. On this point, it is not possible to conclude if characteristics of MIKE 3 electric circuit, e.g., resistance and inductance, are more relevant than HARTMANN circuit ones.

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Section: Usual Interpretation Of Mie Resultsmentioning

confidence: 99%

MIKE 3 versus HARTMANN apparatus: Comparison of measured minimum ignition energy (MIE)

Janes

Chaineaux

Carson

et al. 2008

Journal of Hazardous Materials

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“…The accumulated charges on particle surfaces will induce electrostatic interactions that can significantly influence the dynamic behaviours of particles, especially when the electrostatic forces become dominant over the gravitation of particles [5]. It can cause segregation [6], agglomeration [7][8][9], suspension [10] and even explosion [11] within the particle system. These phenomena are usually detrimental and can extremely diminish the performance of powder handling processes.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of contact electrification of non-spherical particles in a rotating drum

Chen

Adams

2015

Powder Technology

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Contact electrification is generally referred to as the charge transfer process between particles during collisions. The transferred charge can be accumulated on the surface of the particles especially for insulating materials with irregular shapes, which can lead to a non-uniform charge distribution and eventually affects the charge accumulation process. In this study, in order to investigate the influence of the particle shape on contact electrification, a sphere-tree multi-sphere method and a contact electrification model are implemented into the discrete element method (DEM) to model the charging process of irregular particles in a rotating drum. Irregular particles with various Sauter mean diameters but the same maximum diameter and equivalent volume diameters are considered. The charge distribution and accumulation on the particles are investigated. It is found that the charge transfer originates from the contact between the particle and the drum due to the contact potential difference and ζ Presently with Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK * Corresponding author: Tel: 01483683506. Email: c.y.wu@surrey.ac.uk 2 initially takes place primarily at the region near the wall of the drum. The charge eventually propagates to the entire granular bed. The charge of the particles increases exponentially to an equilibrium value. For particles with the same maximum diameter, a larger charging coefficient is obtained for the particles with smaller Sauter mean diameters and sphericities, which lead to a faster charge accumulation, while for particles with the same equivalent volume diameter and fill ratio, similar charging coefficients are observed. A non-uniform intra-particle charge distribution is induced on each individual multi-sphere particle.

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“…Tribo electrostatic charging has numerous applications concerning electrophotography [1], electrostatic powder coating [2,3], drugs delivery and pharmaceutical application [2,[4][5][6], fire hazard and safety [7,8] and particulate separation. Tribo electrostatic separation has gained considerable attention in recent years in the field of mineral processing [9][10][11][12], coal preparation [13][14][15][16][17][18][19][20] and recycling industries [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Studies on the effect of electrode plate position and feed temperature on the tribo-electrostatic separation of high ash Indian coking coal

Dwari

Mohanta

Rout

et al. 2015

Advanced Powder Technology

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A study on the static electrification of powders during pneumatic transportation and the ignition of dust cloud

Cited by 96 publications

References 7 publications

MIKE 3 versus HARTMANN apparatus: Comparison of measured minimum ignition energy (MIE)

MIKE 3 versus HARTMANN apparatus: Comparison of measured minimum ignition energy (MIE)

Numerical analysis of contact electrification of non-spherical particles in a rotating drum

Studies on the effect of electrode plate position and feed temperature on the tribo-electrostatic separation of high ash Indian coking coal

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