Study of an Axial Flow Cyclone to Remove Nanoparticles in Vacuum

Tsai, Chuen Jinn; Chen, Sheng Chieh; Przekop, Rafał; Moskal, Arkadiusz

doi:10.1021/es060518o

Cited by 26 publications

(8 citation statements)

References 19 publications

(32 reference statements)

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“…The larger the particle diameters are, and the higher their mass is, the better they can be collected via thermophoresis. Mechanical filtering [81,92] or cyclones [93,94] are alternative collection methods for nanoscaled powders. A common method for deposition of small charged particles from the gas phase is electrostatic deposition [95,96].…”

Section: Microwave Components and Experimental Set-upmentioning

confidence: 99%

Microwave Plasma Synthesis of Materials—From Physics and Chemistry to Nanoparticles: A Materials Scientist’s Viewpoint

Szabó

Schlabach

2014

Inorganics

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Abstract:In this review, microwave plasma gas-phase synthesis of inorganic materials and material groups is discussed from the application-oriented perspective of a materials scientist: why and how microwave plasmas are applied for the synthesis of materials? First, key players in this research field will be identified, and a brief overview on publication history on this topic is given. The fundamental basics, necessary to understand the processes ongoing in particle synthesis-one of the main applications of microwave plasma processes-and the influence of the relevant experimental parameters on the resulting particles and their properties will be addressed. The benefit of using microwave plasma instead of conventional gas phase processes with respect to chemical reactivity and crystallite nucleation will be reviewed. The criteria, how to choose an appropriate precursor to synthesize a specific material with an intended application is discussed. A tabular overview on all type of materials synthesized in microwave plasmas and other plasma methods will be given, including relevant citations. Finally, property examples of three groups of nanomaterials synthesized with microwave plasma methods, bare Fe 2 O 3 nanoparticles, different core/shell ceramic/organic shell nanoparticles, and Sn-based nanocomposites, will be described exemplarily, comprising perspectives of applications.

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Section: Microwave Components and Experimental Set-upmentioning

confidence: 99%

Microwave Plasma Synthesis of Materials—From Physics and Chemistry to Nanoparticles: A Materials Scientist’s Viewpoint

Szabó

Schlabach

2014

Inorganics

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“…Li et al (2015) established a new pressure drop model which indicates this pressure drop model was suitable for the cyclone splitters with pure or droplet-laden gases. Tsai et al (2004Tsai et al ( , 2007Tsai et al ( , 2011 remove nanoparticles in low pressure or vacuum conditions by an axial-flow cyclone. Quan et al (2009Quan et al ( , 2010 invented a new type of gas-liquid stripping equipment-the water jet air cyclone separator (WSA) which greatly improves the efficiency of the stripping of ammonia.…”

Section: Introductionmentioning

confidence: 99%

Acid Mist Cyclone Separation Experiment on the Hydrochloric Acid Regeneration System of a Cold Rolling Steel Plant

Zhang

Liu

et al. 2016

Aerosol Air Qual. Res.

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In the hydrochloric acid regeneration system of a cold rolling steel plant, the large amounts of hydrochloric acid droplets and iron oxide dust in the flue gas at the absorption column outlet cause serious air pollution. To reduce pollution, a highprecision cyclone separator is utilized to recycle hydrogen chloride acid mist and iron oxide dust simultaneously. The key factors of the high-precision cyclone separator, such as pressure drop, separation efficiency, and fluid density, are investigated to determine the optimal operation parameters under practical working conditions. Results show that the separation efficiency of the cyclone separator increases rapidly initially and then decreases gradually with an increase in pressure drop. Pressure drop and separation efficiency increase slightly with an increase in inlet fluid concentration. When the velocities of the inlet gas are 4.8-10 m s -1 and 5.0-9.2 m s -1 , the separation efficiencies of hydrochloric acid and iron oxide are both higher than 80%. When the velocity of the inlet gas is 6.67 m s -1 , the separation efficiencies of hydrochloric acid and iron oxide reach the highest values of 92% and 89%, respectively.

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“…Ng et al (2007) investigated the flooding, re-entrainment and grade efficiency in axial flow cyclones. Tsai et al (2004Tsai et al ( , 2007 used an axial flow cyclone to remove nanoparticles at low pressures or vacuum conditions. Chen et al (2007), Hsu et al (2005), and Tsai et al (2008Tsai et al ( , 2011Tsai et al ( , 2012) applied a modified axial flow cyclone to assess the exposure of nano-sized and respirable particles at different workplaces.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation Study on Particle Arrangements at the Entrance to a Swirling Flow Field for Improving the Separation Efficiency of Cyclones

et al. 2015

Aerosol Air Qual. Res.

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Based on the concept of particle arrangements at the entrance of a swirling flow field, this paper designs common cyclone (C-cyclone), positive rotation cyclone (PR-cyclone), and reverse rotation cyclone (RR-cyclone). FLUENT software is used to perform CFD (computational fluid dynamics) simulation study on these three cyclones. The study result shows that particles are more easily separated if they are closer to the lower part of the outer wall of the entrance to the swirling flow field, whereas particles access the short circuit current more easily if they are closer to the upper part of the inner wall, thereby generating particles escape. The RR-cyclone helps particles to avoid regions of short-circuiting flow, and thus improves the separation performance. In each part of the separator, the particle concentration within the RR-cyclone is lower than that in the C-cyclone and in the PR-cyclone. Moreover, the separation efficiency of the RRcyclone is higher than that of the C-cyclone and the PR-cyclone in different inlet flows.

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Study of an Axial Flow Cyclone to Remove Nanoparticles in Vacuum

Cited by 26 publications

References 19 publications

Microwave Plasma Synthesis of Materials—From Physics and Chemistry to Nanoparticles: A Materials Scientist’s Viewpoint

Microwave Plasma Synthesis of Materials—From Physics and Chemistry to Nanoparticles: A Materials Scientist’s Viewpoint

Acid Mist Cyclone Separation Experiment on the Hydrochloric Acid Regeneration System of a Cold Rolling Steel Plant

CFD Simulation Study on Particle Arrangements at the Entrance to a Swirling Flow Field for Improving the Separation Efficiency of Cyclones

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