Performance and flow behavior of four identical parallel cyclones

Liu, Feng; Chen, Jianyi; Zhang, Aiqin; Xingdong, Wang; Dong, Teng

doi:10.1016/j.seppur.2014.07.030

Cited by 25 publications

(8 citation statements)

References 12 publications

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“…Furthermore, a comparison of experimental and modeling results in the literature with analysis in this study is also shown in Figure . The mass flow rate ratio ( C T ) can be calculated by superficial gas velocity and the solids circulating rate.…”

Section: Design Principlementioning

confidence: 86%

“…Because the experiment of parallel cyclones is chosen in the extreme dilute cases, uniform distribution dissipates minimal across four parallel cyclones. Thus, the performance of cyclones in parallel can be equal, even better than a single one . When the condition locates near the critical line, the energy barrier from uniformity to mal‐distribution will be low enough to get over easily.…”

Section: Design Principlementioning

confidence: 99%

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Design of parallel cyclones based on stability analysis

et al. 2016

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The uniform distribution of gas solids flow across parallel cyclones is required for high efficiency. In this study, we introduced mass flow rate ratio between solids and gas (CT) to present multi‐phase interaction. And the direct Liapunov method is used to detect the instability of uniformity. Due to the special symmetry in this system, the criterion can be simplified into identifying the concavity (concave or convex) of pressure drop across a single cyclone with respect to CT. Then, based on the stability analysis of uniformity, a novel design principle is provided to prevent non‐uniform distribution at dense phase. The effect of geometrical factor, i.e. dimensionless vortex finder diameter dr, on the stability of uniformity has been further investigated. The phase diagram, illustrating the effects of both operational parameter (CT) and geometrical parameter (dr) on stability of uniformity is calculated to give a clue of designing a robust parallel cyclones system. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4251–4258, 2016

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Section: Design Principlementioning

confidence: 86%

Section: Design Principlementioning

confidence: 99%

Design of parallel cyclones based on stability analysis

et al. 2016

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“…However, in industrial applications, many parallel cyclones with these external symmetrical inlets need to share an air inlet chamber . Many researchers have revealed that the overall efficiency of parallel cyclones is usually lower than that of a single isolated cyclone because of the uneven inflow. − These effects weaken the advantage of the symmetrical inlets. Moreover, these external inlets are usually unable to tilt down.…”

Section: Introductionmentioning

confidence: 99%

Separation Characteristics in a Novel Gas–Liquid Vortex Separator

Zhang

Chenglin

et al. 2020

Ind. Eng. Chem. Res.

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Fischer–Tropsch (FT) synthesis is an essential way to achieve the cleanliness of oil products. A novel gas–liquid vortex separator (GLVS) was put forward to use in the FT synthesis. GLVS has four symmetry vortex arms set inside the separator body. The characteristics of pressure drop and separation efficiency of the GLVS were investigated through a large-scale cold model. The influences of the inlet gas velocity and the inlet liquid concentration on the separator were analyzed. An improved weighting method to calculate the droplet separation efficiency was proposed. The experimental results indicated that the GLVS fits the aerodynamic design and can be operated stably. The dimensionless standard deviation of the pressure drop is maintained within 2%. The “roof skimmers” is not suitable for the GLVS based on visual observation and analysis of the segmental pressure drop, which exacerbates the entrainment. The improved GLVS-2 removes the roof skimmers and increases the diameter of the outlet pipe (vertical) by 0.1 m. These changes reduced the total pressure drop by about 50% compared with the GLVS-1. A model was proposed to predict the pressure drop, wherein the Eu number is 8.08. The pressure drop of the GLVS is mainly affected by the gas velocity, and the liquid concentration has less effect on the pressure drop. The Sauter mean diameter of the droplets initially entering the GLVS is 15.27 μm. It is found that the separation efficiency of the GLVS-2 is about 10% higher than that of the GLVS-1. The liquid critical concentration of the GLVS-2 is related to the gas velocity. Although the entrainment above the vortex arms formed the water bath at a high gas velocity in GLVS-2, it has a positive effect on the separation. The combination of the empirical droplet size model and equilibrium-orbit model can be used to predict the separation efficiency of GLVS-2 with an average deviation of 1.95%.

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“…In order to improve fine particle separation performance of the cyclone separator, multiple cyclone separators were arranged in parallel [15]. However, this could lead to uneven flow distribution among the parallel pathways, which is called maldistribution [16]. Stem et al [18] compared the collection efficiency of a system containing multiple parallel cyclone separators and the single-cyclone separator.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of a Dual‐Stage Cyclone Separator

et al. 2018

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Cyclone separators can be utilized in parallel to increase particle collection efficiency. However, this leads to a maldistribution problem that causes separation performance deterioration. To improve the flow distribution, a dual-stage multicyclone separator (DSCS) was designed, containing a tangential-inlet circle pathway cyclone array, an axial-inlet radiation pathway cyclone array, and a cylindrical outer chamber. Experimental and computational fluid dynamics results revealed the gas-particle flow distribution through multicyclone arrays. Effects of flow distribution on particle deposition were investigated experimentally. Particle trajectories inside the cyclone separators were also observed. The multicyclone array proved to generate a uniform inlet velocity distribution. The proposed cyclone separator can be considered as an option to accomplish dilute gas-particle separation.

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Performance and flow behavior of four identical parallel cyclones

Cited by 25 publications

References 12 publications

Design of parallel cyclones based on stability analysis

Design of parallel cyclones based on stability analysis

Separation Characteristics in a Novel Gas–Liquid Vortex Separator

Experimental and Numerical Investigations of a Dual‐Stage Cyclone Separator

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