Evaluation and improvement of particle collection efficiency and pressure drop of cyclones by redistribution of dustbins

Guo, Zhang; Chen, Guang; Yan, Xiaohong

doi:10.1016/j.cherd.2018.09.021

Cited by 30 publications

(8 citation statements)

References 34 publications

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“…Zhang et al 54 Gas-air Solid-particle The gas-solid flow in two cyclones with multidustbins distributed at the sidewalls and bottom walls are proposed.…”

Section: Gridmentioning

confidence: 99%

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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The liquid–solid concave‐wall jet existed in the vertical cylinder separator with tangential inlet; the instability near concave‐wall was the key factor for centrifugal separation. The effects of jet flowrate and wall curvature radius on the instability of solid‐particles were explored by experiment and numerical simulation. The results showed that the separation efficiency of particles decreased with the increase of centrifugal separation factor. The liquid–solid concave‐wall jet flow in separator was unstable in this study. The decay rate of jet maximum velocity on the concave‐wall was larger than that on plane‐wall jet. The ratio of half‐width value to wall curvature radius was about 0.08 at the circumferential direction 90°, which coincided with the critical value of centrifugal instability in strongly concave‐wall jet. The pressure, velocity, and vorticity fluctuated periodically along streamwise direction in separator. The fluctuation period was linearly related to the wall curvature, and the radial range of fluctuation was only half of jet width. The paired longitudinal vortices formed along the flow direction, and the longitudinal vortices merged at length 0.74 m from the inlet cross‐section along circumferential direction. After the position of vortices merged, the particle trajectory oscillated obviously.

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“…Zhang et al 54 Gas-air Solid-particle The gas-solid flow in two cyclones with multidustbins distributed at the sidewalls and bottom walls are proposed.…”

Section: Gridmentioning

confidence: 99%

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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“…In the second category of existing CFD studies of cyclones operating at ambient temperature, category (II), the one-way coupling method is employed for very dilute loading of particles (see Figure 4), and the E-L approach is commonly utilized. The particles are tracked either after the simulation has reached a steady-state solution, as a post-processing step [69,[79][80][81][82][83][84][85][86][87], or in a transient way along the unsteady simulation [75,79,[88][89][90][91][92][93]. After the completion of the particle-tracking procedure, the particle separation efficiencies are predicted and usually compared with the available experimental data.…”

Section: Group Ii: One-way Coupled Gas-solid Flow Simulationsmentioning

confidence: 99%

CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures

Nakhaei

Tian

et al. 2020

Processes

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Gas–solid cyclone separators are widely utilized in many industrial applications and usually involve complex multi-physics of gas–solid flow and heat transfer. In recent years, there has been a progressive interest in the application of computational fluid dynamics (CFD) to understand the gas–solid flow behavior of cyclones and predict their performance. In this paper, a review of the existing CFD studies of cyclone separators, operating in a wide range of solids loadings and at ambient and elevated temperatures, is presented. In the first part, a brief background on the important performance parameters of cyclones, namely pressure drop and separation efficiency, as well as how they are affected by the solids loading and operating temperature, is described. This is followed by a summary of the existing CFD simulation studies of cyclones at ambient temperature, with an emphasis on the high mass loading of particles, and at elevated temperatures. The capabilities as well as the challenges and limitations of the existing CFD approaches in predicting the performance of cyclones operating in such conditions are evaluated. Finally, an outlook on the prospects of CFD simulation of cyclone separators is provided.

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“…In addition, Sakura et al [16] used the large eddy simulation (LES) model, based on Ansys CFX to study the gas-solid flow characteristics of cyclone separators, and compared the effects of different dust outlet shapes on separation efficiency and pressure drop. Zhang et al [17] used the transient Reynold's stress model and discrete phase model to study the flow field and particle motion trajectory in the cyclone separator, and proposed a new cyclone separator, which can improve efficiency and reduce pressure drop. Furthermore, Parvaz et al [18] studied the performance of a cyclone separator which had an inner cone located at the bottom of the cyclone, and simulated the influence of the inner cone with different heights and diameters on the performance of the separator.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Separation Performance of Cyclone Flue Used in Grate Waste Incinerator

et al. 2019

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The traditional treatment of waste incineration flue gas is mostly carried out in low temperatures, but there are some problems such as corrosion of the heating surface at high and low temperatures, re-synthesis of dioxins, and low efficiency. Therefore, it is necessary to remove the pollutants at high temperatures. For the grate waste incinerator, this study proposes an adiabatic cyclone flue arranged at the exit of the first-stage furnace of the grate waste incinerator to pre-remove the fly ash at high temperatures, so as to alleviate the abrasion and corrosion of the tail heating surface. In this paper, computational fluid dynamics (CFD) method is applied to study the performance of a cyclone flue under different structural parameters, and the comprehensive performance of the cyclone flue is evaluated by the technique for order preference by similarity to an ideal solution (TOPSIS) method. The results show that particle separation efficiency increases at first and then decreases with the increase of the vortex finder length, the vortex finder diameter, and the distance between vortex finder and gas outlet tube, while it decreases with the increase of the gas outlet tube diameter. The pressure drop increases with the increase of the vortex finder length, and the vortex finder diameter, while decreases with the increase of the distance between the vortex finder, the gas outlet tube, and the gas outlet tube diameter. In the scope of this study, when h1/a = 1.1, D1/A = 0.33, h2/A = 1.5, and D2/A = 0.50, the comprehensive performance of the cyclone flue is much better.

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Evaluation and improvement of particle collection efficiency and pressure drop of cyclones by redistribution of dustbins

Cited by 30 publications

References 34 publications

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures

Numerical Study on Separation Performance of Cyclone Flue Used in Grate Waste Incinerator

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