A New Fine Particle Removal Technology: Cloud-Air-Purifying

Wang, Bo; Li, Si-Qing; Dong, Sijie; Xin, Rubin; Jin, Ruizhi; Zhang, Yumeng; Dong, Kejun; Jiang, Youlu

doi:10.1021/acs.iecr.8b03034

Cited by 30 publications

(4 citation statements)

References 55 publications

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“…Figure 1a and Table 1 show the structure and dimensions of the Lapple gas cyclone used in an experiment study [25], which was also used in this work. The whole computational domain was divided by a structured hexahedral mesh, as shown in Figure 1b.…”

Section: Simulation Conditionsmentioning

confidence: 99%

Effect of Turbulence on the Performance of a Gas Cyclone

Jin¹,

Keshavarzian²,

Dong³

et al. 2020

Australasian Fluid Mechanics Conference (AFMC)

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Particle dispersion in turbulent flow is ubiquitous in many applications. This paper investigates the effect of turbulent flow on the performance of a gas cyclone involving gas-particle flow by using computational fluid dynamics. The turbulence of gas was simulated with the Reynolds stress model, while particles were simulated by the Lagrangian particle tracking model, in which the stochastic tracking (random walk) approach was used to predict the particle dispersion due to turbulence. It is shown that gas turbulence can deteriorate the collection efficiency by increasing the possibility of particles to disperse into the inner vortex. The turbulence plays a critical role at the bottom of the vortex finder where the turbulence intensity is the highest. The negative effect is more significant when the ratio of the radial drag force to the centrifugal force on particles is close to 1, which can be one of the reasons for the poor collection of PM2.5 in cyclones.

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Section: Simulation Conditionsmentioning

confidence: 99%

Effect of Turbulence on the Performance of a Gas Cyclone

Jin¹,

Keshavarzian²,

Dong³

et al. 2020

Australasian Fluid Mechanics Conference (AFMC)

Self Cite

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“…[28][29][30][31][32][33][34][35] Wang et al combined cyclones with heterogeneous condensation preconditioning technology and found that for fine particles with a size of approximately 2 μm, when ultrasonic vapour concentration increased from 0 to 12.66 g/m 3 , the separation efficiencies of the white carbon black and molecular sieve particles increased from 9.16% to 76.08% and from 40.87% to 86.36%, respectively. [36] Then, Zhang et al studied the effect of the temperatures of the water vapour and the flue gas on the cyclone separation efficiency. [37] On this basis, using surfactants to improve the particle hydrophilicity and charging particles to enhance particle agglomeration have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Multi‐object optimization study on the performance of gas cyclones based on heterogeneous condensation and turbulent agglomeration

et al. 2023

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Improving the separation efficiency of fine particles becomes more and more critical as environmental pollution aggravates. This study aims to investigate the effects of four key parameters on the performance of gas cyclones, including cyclone body height, particle concentration, initial supersaturation degree, and inlet temperature. Then, the two‐way coupling numerical model, in which is the process of heterogeneous condensation and agglomeration for insoluble fine particles, was achieved by user defined function. On this basis, the response surface analysis method and multi‐objective genetic algorithm were adopted to optimize the cyclone. The results show that when the particle concentration is less than 1000 mg/m3, the separation efficiency can reach above 95%. The initial supersaturation degree has the greatest effect on the separation efficiency and vapour consumption rate, while the cyclone body height is the most critical factor on the pressure drop. As the particle concentration increases, the separation efficiency decreases at first and then keeps almost stable. With the increase of inlet temperature, the separation efficiency is enhanced, and the pressure drop reduces. These research results can provide important guidance for the optimization and engineering application of this technology.

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“…The cyclone separator has been widely applied in various gas-particle separation processes due to its simple structure and good separation performance. , A typical cyclone separator consists of an inlet duct, cylinder body, cone tip, and vortex finder. The structure of the cyclone plays a critical role in the inside flow pattern and, therefore, has a great impact on the performance of the cyclone.…”

Section: Introductionmentioning

confidence: 99%

Double-Eccentric Design for the Vortex Finder of a Cyclone Separator

Yao

Huang

Zhou

et al. 2022

Ind. Eng. Chem. Res.

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In the present study, a double-eccentric design for the vortex finder of a cyclone separator was proposed to enhance the cyclone performance. Using the numerical approaches, the flow field inside the cyclone was simulated and the cyclone performance was evaluated. The orthogonal method was adopted to obtain the optimal structure of the double-eccentric vortex finder. The range analysis of the five key geometric factors in the double-eccentric design was also conducted. It was found that cyclone performance is more sensitive to the eccentricity of the vortex finder than the other factors. The best eccentric angle of the inlet of the vortex finder is 270°, which markedly improves the separation efficiency and slightly increases the pressure drop. The simulated flow field depicted that the double-eccentric vortex finder results in the strongest swirling flow in the middle and lower parts of the cyclone compared with the vortex finders of the original, non-eccentric, and single-eccentric designs. The results also reflected that off-centering the vortex finder has the most significant impact on the flow patterns. Moreover, an industrial test was carried out in a circulating fluidized bed boiler for this novel vortex finder. The fly ash of the double-eccentric vortex finder becomes finer and contains less carbon content than that of the original one, which indicates that the double-eccentric vortex finder successfully enhances the separation performance.

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A New Fine Particle Removal Technology: Cloud-Air-Purifying

Cited by 30 publications

References 55 publications

Effect of Turbulence on the Performance of a Gas Cyclone

Effect of Turbulence on the Performance of a Gas Cyclone

Multi‐object optimization study on the performance of gas cyclones based on heterogeneous condensation and turbulent agglomeration

Double-Eccentric Design for the Vortex Finder of a Cyclone Separator

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