Experimental and Numerical Investigations on the Electrostatics Generation and Transport in the Downer Reactor of a Triple-Bed Combined Circulating Fluidized Bed

Cheng, Yongpan; Lau, Darren Yan Jun; Guan, Guoqing; Fushimi, Chihiro; Tsutsumi, Atsushi; Wang, Chi-Hwa

doi:10.1021/ie3011879

Cited by 25 publications

(15 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the same area, half-circle granular and rectangle granular tend to acquire the same electrostatic charge. This result agreed with the experimental findings by Cheng et al [9], who the electrostatics generation in the downer reactor and observed that the averages induced currents increased with particle diameter. In addition, this trend was also supported by experimental work on tribocharging of aerosols of fine phosphate rock concentrations done by Marra et al [22], who found that the generated charge of particles increased accordingly with the mean particle size, implying a greater extent of electrostatics.…”

Section: Influence Of Length-ratiosupporting

confidence: 93%

“…On the other hand, the proper usage of electrostatics can be beneficial in many industrial processes, such as printing, and dust removal. Therefore, it is of great significance to study the electrostatic phenomenon in fluidization and granular flow system to mitigate its negative effects and utilize its positive effects [9]. Granular material is commonly used in solid-handling or pneumatic conveying systems in the energy, chemical, pharmaceutical, and material processing industries.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation of Electrostatic Charge Generation for Granules

Zhou

Yin

et al. 2015

Procedia Engineering

View full text Add to dashboard Cite

In studies of granule electrification due to sliding, quantitatively evaluating the charging characteristic of single particles, rather than of a mass of granules as a group, is important for a fundamental understanding of the elementary tribocharging phenomenon, which is complicated, since it is resulted from electrical and physical properties of granules and operational environment conditions. In this work, charge transfer due to a single particle repeated sliding along metal plane for Polyvinyl Chloride(PVC)granules(diameter 1.1-4.1 mm, in the shape of halfcircle or rectangle). The amount of transferred charge is expressed as a function of granular shape factor, such as length-ratio, sliding area, front-facing edge, as well as sliding velocity, plane angle and relative humidity. The transferred charge increases with length-ratio and area. Front-facing edge, plane angle, sliding velocity and relative humidity do have effect on the degree of electrification.

show abstract

Section: Influence Of Length-ratiosupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Electrostatic Charge Generation for Granules

Zhou

Yin

et al. 2015

Procedia Engineering

View full text Add to dashboard Cite

show abstract

“…For both cases ( Fig.5(a),(b)), it is seen that the electrostatics (charge to length-ratio) increases with sliding area, which is independent of granule sliding-face shape. This result agrees well with the experimental findings by Cheng et al [25], who investigated electrostatics generation in a downer reactor and observed that the averaged induced currents increase with granule diameter. In addition, this conclusion also agrees well with the experiment work done by Marra et al [26], where they studied tribocharging of aerosols of fine phosphate rock concentrations and concluded that electrostatics charge generated increases with granule size.…”

Section: Sliding Area Effectsupporting

confidence: 93%

Electrostatic charging of single granules by repeated sliding along inclined metal plates

Zhao¹,

Zhou²,

Ye³

et al. 2017

Journal of Electrostatics

View full text Add to dashboard Cite

In this work, repeated sliding tests for single granules were investigated for their electrostatics generation. Several factors were considered including granule length-ratio, sliding face shape, sliding times, sliding area, sliding velocity, front-facing edge, plate inclined angle and humidity. Generally, it is found that electrostatics increases with granule length-ratio. Two kinds of granular sliding face shapes were used in this work, half circle and rectangle. Under the same working conditions, a granule with the sliding face shape of half-circle tends to produce more electrostatics than that of rectangle. In addition, the efficiency of granule charge generation increases with sliding times although the amount of impact charge is decreased by the initial charge. Electrostatics increases with sliding area, which is independent of granule sliding-face shape and sliding times. Electrostatics also increases with granule sliding velocity. Front-facing sliding with a short edge tends to generate more electrostatics than that with a long edge. In this work, three sliding-plate angles were chosen as 30°,54°,70°, where granules sliding along the inclined plate at 54° acquired the highest electrostatics in comparison with other two angles. Humidity has significant effect on electrostatics as that electrostatics decreases with humidity. At lower relative humidity, the granule length-ratio is found to have more effect on electrostatics.

show abstract

Section: Introductionmentioning

confidence: 99%

“…There are also reports regarding the CFD and/or discrete element method modeling incorporating the electrostatics/triboelectrification model for other fluidized bed reactors (FBRs) instead of FCC risers. [41][42][43][44][45][46][47][48] Recently, Cheng et al [41] investigated the electrostatic performance in the downer reactor of a triple-bed combined circulating FBR via experiments and numerical simulations. Rokkam et al [42] developed a first-principles electrostatic model and incorporated it into a multifluid CFD model to understand the effect of electrostatics in a polymerization FBR in their works.…”

Section: Introductionmentioning

confidence: 99%

A CFD modeling of the gas–solid two‐phase flow in an FCC riser under the electrostatic conditions

Jiang

Xiao

Luo

2014

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Electrostatics is an inevitable phenomenon in fluidization processes and granular flow, where collisions between particulates and walls with different materials occur. In this work, a two-dimensional computational fluid dynamics model based on the Eulerian-Eulerian approach was applied and coupled with a first-principles electrostatic model to describe the gas-solid two-phase flow behavior in a fluid catalytic cracking (FCC) riser reactor under the electrostatic conditions. The coupled model was used to predict the main gas-solid flow distribution parameters in the FCC riser, such as electric potential, particle volume fraction, gas-phase temperature, and gas-phase component fractions. The simulation results showed that the electrostatic had a significant influence on the particle distribution in the bottom dense region of the FCC riser, whereas it had a weak influence in the upper dilute region at the cold-flow conditions. The simulation results also showed that the electrostatic had a weak influence on the particle concentration, gas-phase temperature, and lump concentration distributions when the cracking reaction was considered.

show abstract

Experimental and Numerical Investigations on the Electrostatics Generation and Transport in the Downer Reactor of a Triple-Bed Combined Circulating Fluidized Bed

Cited by 25 publications

References 41 publications

Experimental Investigation of Electrostatic Charge Generation for Granules

Experimental Investigation of Electrostatic Charge Generation for Granules

Electrostatic charging of single granules by repeated sliding along inclined metal plates

A CFD modeling of the gas–solid two‐phase flow in an FCC riser under the electrostatic conditions

Contact Info

Product

Resources

About