Implementation of Faraday cup electrostatic charge measurement technique in high-pressure gas–solid fluidized beds at pilot-scale

Song, Di; Salama, Fawzi; Matta, Johnny; Mehrani, Poupak

doi:10.1016/j.powtec.2015.05.049

Cited by 21 publications

(10 citation statements)

References 15 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Released particles were collected into a Faraday pail for charge measurement [99,100]. The above mentioned system has also been used at elevated pressures up to 25 barg [101]. [95].…”

Section: Sampling Methodsmentioning

confidence: 99%

“…In a later work carried out by the same research team, Song at al. presented results of fluidization of a commercial polyethylene resin at atmospheric condition and a more industrially relevant pressure of 2500 kPa, while keeping the ratio of the gas velocity to the minimum fluidization velocity constant [101]. Their results indicated that elevating the pressure to 2500 kPa augmented the migration of the charged particles and adhesion on the column wall by a factor of two.…”

Section: Effect Of Operating Pressure and Temperaturementioning

confidence: 99%

See 1 more Smart Citation

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

Mehrani

Murtomaa

Lacks

2017

Journal of Electrostatics

Self Cite

View full text Add to dashboard Cite

Electrostatic charging of particles in gas-solid fluidized beds often results in operational complications in commercial processes. This paper provides a comprehensive review of the advances from the last decade in three key areas, namely the fundamental understanding of triboelectric charging, methods to measure particle charge, and experiments to elucidate particle charging processes in fluidized beds. This review underscores the need for better understanding the mechanisms of triboelectric charging in granular systems, effective online charge monitoring techniques, and experiments under industrially relevant conditions to better comprehend the problems in commercial reactors that can enable strategies to mitigate charging.

show abstract

“…Released particles were collected into a Faraday pail for charge measurement [99,100]. The above mentioned system has also been used at elevated pressures up to 25 barg [101]. [95].…”

Section: Sampling Methodsmentioning

confidence: 99%

Section: Effect Of Operating Pressure and Temperaturementioning

confidence: 99%

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

Mehrani

Murtomaa

Lacks

2017

Journal of Electrostatics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sowinski et al [7] demonstrated that connecting the wall of the fluidized bed to the ground does not have a significant effect on the electrostatic charge of particles and the sticking of particles to the wall. Song et al [8] concluded that with increasing the gas velocity and changing the flow regime from bubbling to turbulent, the number of particles accumulated on the wall increases because of enhanced particle-wall contacts. In addition, it was observed that the wall sheets mainly consist of fine particles because of their larger charge-to-mass ratio as compared to coarse particles.…”

Section: Introductionmentioning

confidence: 99%

CFD‐DEM simulation of wall sheeting and particles charge in fluidized beds

et al. 2021

View full text Add to dashboard Cite

The effect of the electrostatic charge of particles was investigated in fluidized beds with conductive and nonconductive walls. For this purpose, changes in the wall surface charge density and particle contact time near the wall were examined. Computational fluid dynamics/discrete element method (CFD‐DEM) was utilized to simulate the accumulation of particle and wall‐induced electrostatic charges in a quasi‐two‐dimensional fluidized bed. Particles and walls were initially considered neutral and gained charge with time. The simulations showed that aggregated particles are formed due to the presence of the opposite electrostatic charges. Agglomerates are produced by joining the aggregated particles together. Agglomerates have a layered‐like structure and are made of positive and negative particles. Accumulation of these agglomerates and aggregated particles on the wall forms wall sheeting, which has a layered‐like structure. In other words, particles do not accumulate on the wall individually. A significant accumulation of particles near the wall was seen in the presence of electrostatic charges compared with the neutral bed. Also, the contact time of particles on the wall in the conductive case was more prolonged than in the nonconductive case. The results indicate that the CFD‐DEM approach is a helpful technique for predicting particles behaviour in the presence of the electrostatic charge.

show abstract

“…Although triboelectric charging can be utilized in several industrial areas like toners [1], mineral separation [2] and also plastics separation [3,4], it is typically viewed as an undesired phenomenon that complicates pneumatic conveying of powders [5][6][7] and leads to particle agglomeration and fouling of devices [8][9][10][11][12][13][14]. Many industrially important products are delivered in the form of fine powders of typically insulator particles (polymers, drugs, food supplements, pigments, flour) and their charging can be very fast.…”

Section: Introductionmentioning

confidence: 99%

Triboelectric charging of polyethylene powders: Comparison of same-material and different-material contributions to the charge build-up

et al. 2020

View full text Add to dashboard Cite

The understanding of triboelectric charging of industrially important powders can help in avoiding or controlling the particle agglomeration and wall sheeting. We developed a new experimental approach to study both samematerial particle-particle (P\ \P) and different-material particle-wall (P\ \W) charging of nascent polyethylene (PE) particles born by catalytic polymerization. We constructed a simple tribocharger consisting of a metal box divided inside into several compartments filled with the PE sample and attached to the vibration shaker. The particle charge distribution was characterized by a self-constructed electrostatic separator. This way, we investigated the charging dynamics of PE particles colliding with other PE particles as well as with metal walls of the box compartments. Both P\ \P and P\ \W charging were measured either separately, or in sequence, and in combination of simultaneous P\ \P and P\ \W. The different-material P\ \W charging produced unipolarly charged particles and was much faster than the same-material P\ \P charging leading to bipolar particle charge distribution.

show abstract

Implementation of Faraday cup electrostatic charge measurement technique in high-pressure gas–solid fluidized beds at pilot-scale

Cited by 21 publications

References 15 publications

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

An overview of advances in understanding electrostatic charge buildup in gas-solid fluidized beds

CFD‐DEM simulation of wall sheeting and particles charge in fluidized beds

Triboelectric charging of polyethylene powders: Comparison of same-material and different-material contributions to the charge build-up

Contact Info

Product

Resources

About