Influence of swirling intensity on lump coal particle pickup velocity in pneumatic conveying

Zhou, Jiawei; Du, Chenglie; Ma, Zi-ling

doi:10.1016/j.powtec.2018.08.043

Cited by 26 publications

(10 citation statements)

References 33 publications

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“…This indicates that the cuttings transport in the cuttings bed should satisfy at least one critical swirl number. Otherwise, increasing the swirl strength of the fluid within the critical swirl number will not help the hole cleaning . At the same time, it can be seen from Figure B that the distribution of deposition index with the three helical angles for the negative blade is ideal, and the average effective distance can exceed 1.1 m. The results show that the hole cleaning effect of the negative blade is better than that of the positive blade.…”

Section: Resultsmentioning

confidence: 88%

Investigation on horizontal and deviated wellbore cleanout by hole cleaning device using CFD approach

Yan

Sun

et al. 2019

Energy Science & Engineering

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The application of the hole cleaning device in downhole is a new technology for removing cuttings bed, and it can increase the efficiency of cuttings transport. This paper mainly studies the effects of the helical angle and the rotational speed of the blade of the hole cleaning device on the swirl strength of decaying swirl flow and drilled cuttings deposition behavior. A three‐dimensional computational fluid dynamics (CFD) model is established using the Eulerian‐Eulerian two‐fluid model, Realizable k‐ε turbulence model, and Sliding Mesh technique for simulating the two‐phase fluid flow. The results have been compared with available data in the literature, and a good agreement is found. In order to understand the decay behavior of the swirl flow along the flow direction, the initial swirl strength, the swirl number, and the decay rate of swirl are analyzed in detail in single phase. The effects of the swirl flow induced by the blade on the deposition behavior of drilled cuttings under different rotational speed and helical angle are studied. A new deposition index is used to evaluate the effective distance and hole cleaning efficiency of the swirl flow under various parameters. It has been observed that using the hole cleaning device can improve the hole cleaning performance. The research results of this paper is instructive to the design of the hole cleaning device using in the drilling engineering.

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Section: Resultsmentioning

confidence: 88%

Investigation on horizontal and deviated wellbore cleanout by hole cleaning device using CFD approach

Yan

Sun

et al. 2019

Energy Science & Engineering

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“…Numerous studies have examined this simulation for conveying motion in a gas flow, such as by Zhou et al, − Chu et al, and Li et al To validate the numerical simulation properties, the results of the simulations and experiments were compared. The authors have experimentally examined the lump coal pickup characteristics in an axial airflow and swirling flow . The experimental setup, shown in Figure , has been well described in previous work and will not be repeated here.…”

Section: Methodologiesmentioning

confidence: 99%

“…The authors have experimentally examined the lump coal pickup characteristics in an axial airflow 17 and swirling flow. 22 The experimental setup, shown in Figure 2, has been well described in previous work and will not be repeated here. The simulation is set according to the pickup section of this figure.…”

Section: Methodologiesmentioning

confidence: 99%

“…As shown in the aforementioned studies, most researchers have focused on how to determine or calculate the pickup velocity for various particles, but few have attempted to reduce the pickup velocity via an optimized airflow, the other side of gas−solid systems. Zhou et al 22 examined the effect of the intensity of the swirling airflow on the lump coal particle pickup velocity, and the results showed that the coal particle pickup velocity generally decreases with the swirling number after a slight increase. This indicates that the optimized airflow will benefit the pickup velocity and contribute to the performance of pneumatic conveying system improvement.…”

Section: Introductionmentioning

confidence: 99%

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Pickup Characteristics of Lump Non-spherical Particles in an Oscillating Airflow

Zhou

Shangguan

Gao

et al. 2020

Ind. Eng. Chem. Res.

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The pickup characteristics of lump non-spherical particles in an oscillating airflow were numerically studied on the basis of experimental verification. Five typical shapes of lump coal particles with diameters of 5−7 mm were numerically calculated. The impact of the oscillating amplitudes and the frequencies was discussed. The oscillating number was first defined to quantitatively examine the oscillating intensity. Two points are worth highlighting: (1) the increase in the particle pickup ratio caused by the strength interaction intensity mostly prioritized the particle pickup process in an oscillating airflow. Particles were liable to be entrained, but this process was weakened in the continuous pickup process in a high-frequency rectangular wave airflow. (2) A significant consistent regression relationship was observed in both the swirling airflow and oscillating airflow in which the particle pickup velocity increases at first and then decreases with both the oscillating number and swirling number.

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“…At present, some scholars have carried out simulation and experimental research [27]. Zhou [28][29][30] used CFD-DEM numerical simulation to study the influence of particle shape and flow field flow pattern on the fragmentation of massive coal particles in pneumatic conveying. At the same time, in order to reduce the air flow speed in pneumatic conveying of coal particles, the influence of swirl strength on the capture speed of bulk coal particles was studied through experiments, and the particle breaking process and energy change law in the large coal particle pneumatic conveying with different pipeline structure and swirl strength were studied.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Horizontal Pneumatic Conveying of Large Coal Particles Using Discrete Phase Model

Yang

Wang

et al. 2020

Advances in Materials Science and Engineering

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The pneumatic conveying focusing on gas-solid two-phase flow plays an important role in a conveying system. Previous work has been conducted in the fields of small particles, where the size was less than 5 mm; however, there are few studies regarding large sizes (>5 mm). In order to predict the horizontal pneumatic conveying of large coal particles, the coupling methods based on the Euler–Lagrange approach and discrete phase model (DPM) have been used for the simulated research. Compared with the experimental results under the same working condition, the particle trajectory obtained by simulation is similar to the particle distribution at the same position in the experiment, and it turns out that the simulation method is feasible for the horizontal pneumatic conveying of large particles. Multifactor simulations are also carried out to analyse the effects of particle size, flow field velocity, solid-gas rate, and pipe diameter on the wall abrasion during horizontal pneumatic conveying, which provides simulation reference and design guide for pneumatic conveying of large particles.

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Influence of swirling intensity on lump coal particle pickup velocity in pneumatic conveying

Cited by 26 publications

References 33 publications

Investigation on horizontal and deviated wellbore cleanout by hole cleaning device using CFD approach

Investigation on horizontal and deviated wellbore cleanout by hole cleaning device using CFD approach

Pickup Characteristics of Lump Non-spherical Particles in an Oscillating Airflow

Prediction of Horizontal Pneumatic Conveying of Large Coal Particles Using Discrete Phase Model

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