Effect of the particle injection position on the performance of a cyclonic gas solids classifier

Sun, Zhigang; Liang, Longlong; Liu, Qinggang; Yu, Xiaolong

doi:10.1016/j.apt.2019.10.014

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…A dynamic cyclonic classifier was employed to classify particles according to their sizes by Galletti et al [31], wherein a rotating impeller was employed to improve the efficiency of the cyclone. Another classifier was proposed by Sun et al [32], in which three characteristic regions were used to capture solid particles based on the particle size. The novel slotted vortex finder was reported to enhance the cyclone performance by Fu et al [33].…”

Section: Introductionmentioning

confidence: 99%

CFD Investigations of Cyclone Separators with Different Cone Heights and Shapes

et al. 2022

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Due to the great achievements in the field of optimization of the design of cyclone separators, non-standard solutions are sought to increase their performance. Therefore, in this study, we consider the impact of different cone and cylinder height variants on the performance of cyclone separators. Additionally, we propose non-standard shapes for these sections. Three different heights: H/D = 0.5, 1.0, and 1.5, with D (the main cyclone body diameter), are analyzed. Since the cone is one of the most important geometrical entities, three different shapes viz. a straight (conventional) profile, a concave profile as well as a convex profile are also taken into account. Cyclone performance is rated at three different inlet velocities viz. Uin = 10 m/s, 15 m/s, and 20 m/s. Hence, a total of 27 simulations have been performed using the Reynolds stress model. It becomes apparent from the present study that the pressure loss is lowest in the convex variant, whereas the separation efficiency is better in the conventional design. Furthermore, an increase in the length of the cylindrical section reduces pressure drop with a mild decrease in the collection efficiency in all variants.

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Section: Introductionmentioning

confidence: 99%

CFD Investigations of Cyclone Separators with Different Cone Heights and Shapes

et al. 2022

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“…(1) The cyclone inlet (shaping the inlet tube or changing the way the inlet stream is fed into the cylindrical part of the cyclone) [61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79]; (2) The cyclone outlet tube (shaping the outlet tube and using special steering wheels (deswirlers) inside the outlet tube) [80][81][82][83][84][85][86]; (3) The dumping hole and dust container [87][88][89][90][91][92][93][94].…”

Section: Analysis Of Options For Increasing the Separation Efficiency...mentioning

confidence: 99%

“…In the work [66], a tangential inlet reciprocating cyclone (without cylindrical part) with two equal symmetrical inlets attached to the conical section at the top of the section was numerically investigated. In contrast, Lim et al [67] installed additional inlets in the conical section of a tangential cyclone separator, numerically investigated and then experimentally verified their effect on filtration efficiency and pressure drop.…”

Section: Analysis Of Options For Increasing the Separation Efficiency...mentioning

confidence: 99%

Experimental Investigation of Possibilities to Improve Filtration Efficiency of Tangential Inlet Return Cyclones by Modification of Their Design

Dziubak

2022

Energies

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It has been shown that tangential inlet return cyclones are commonly used for inlet air filtration of off-road vehicle engines. The wear of the engine elements, and thus their durability, is determined by the efficiency and accuracy of the inlet air filtration. It has been shown that the possibilities of increasing the separation efficiency or decreasing the pressure drop of a cyclone by changing the main dimensions of the cyclone are limited, because any arbitrary change in one of the dimensions of an already operating cyclone may cause the opposite effect. A literature analysis of the possibility of increasing the filtration efficiency of cyclones by modifying the design of selected cyclone components was conducted. In this paper, three modifications of the cyclone design with a tangential inlet of the inlet air filter of a military tracked vehicle were proposed and performed. The symmetrical inlet of the cyclone was replaced with an asymmetrical inlet. The cylindrical outlet tube was replaced with a conical tube, and the edges of the inlet opening were given an additional streamlined shape. The modification process was carried out on three specimens of the reversible cyclone with a tangential inlet. After each modification, an experimental evaluation of the modifications was carried out. The influence of the modifications on the cyclone’s efficiency characteristics and pressure drop was examined. Subsequent modifications of the cyclone were performed on the same specimen without removing the previous modifications. Tests were performed in the air flow range QG = 5–30 m3/h. Polydisperse “fine” test dust with grain size dpmax = 80 µm was used for testing. The dust concentration at the cyclone inlet was set at 1 g/m2. The performed modifications caused a slight (about 1%) increase in separation efficiency in the range of small (up to QG = 22 m3/h) flux values and about 30% decrease in pressure drop in the whole range of the QG flux, which positively influences the increase in engine filling and its power. There was a noticeable increase in filtration accuracy in the range of low and high values of QG flux, which results in a decrease in the wear of engine components, especially the piston-piston ring-cylinder (P-PR-C) association, and an increase in their durability.

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“…Chen et al [12] showed through experimental and numerical simulation results that the presence of a limited number of baffles in the fluidized bed can reduce the residence time of particles without affecting the average residence time. Sun et al [13] effectively improved the classification accuracy by changing the feeding position of a traditional cyclonic classifier. Wang et al [14,15] designed a three-product liquid-solid fluidized bed classifier.…”

Section: Introductionmentioning

confidence: 99%

Classification Performance of a Novel Hydraulic Classifier Equipped with a W-Shaped Reflector

et al. 2022

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In the present research, we propose the use of a novel hydraulic classifier equipped with a W-shaped reflector to enhance classification performance. The effects of the structural dimensions of a W-shaped reflector on the flow field of a classifier and its classification performance were investigated using numerical simulations and experiments. The results demonstrate that the reflection of the W-shaped reflector results in the return of the feed material back to the classification cavity. After this, the materials are mixed with a rising water flow in order to avoid the settlement of particles. Thus, the particles can stay longer in the classification cavity, facilitating the generation of a suspension bed and effectively improving the classification efficiency and accuracy. Our data indicates that the overall classification efficiency of the classifier embedded with the W-shaped reflector was 11.19% higher than that of a traditional classifier. Our results provide a reference for classifier optimization.

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Effect of the particle injection position on the performance of a cyclonic gas solids classifier

Cited by 6 publications

References 24 publications

CFD Investigations of Cyclone Separators with Different Cone Heights and Shapes

CFD Investigations of Cyclone Separators with Different Cone Heights and Shapes

Experimental Investigation of Possibilities to Improve Filtration Efficiency of Tangential Inlet Return Cyclones by Modification of Their Design

Classification Performance of a Novel Hydraulic Classifier Equipped with a W-Shaped Reflector

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