The Impact of a Ceramic Wear Liner on the Separation Efficiency of a Particular Cyclone Dust Collector

Lithium iron phosphate (LFP) batteries contain metals, toxic electrolytes, organic chemicals and plastics that can lead to serious safety and environmental problems when they are improperly disposed of. The published literature on recovering spent LFP batteries mainly focuses on policy-making and conceptual design. The production line of recovering spent LFP batteries and its detailed operation are rarely reported. A set of automatic line without negative impact to the environment for recycling spent LFP batteries at industrial scale was investigated in this study. It includes crushing, pneumatic separation, sieving, and poison gas treatment processes. The optimum retaining time of materials in the crusher is 3 minutes. The release rate is the highest when the load of the impact crusher is 800 g. An air current separator (ACS) was designed to separate LFP from aluminium (Al) foil and LFP powder mixture. Movement behaviour of LFP powder and Al foil in the ACS were analysed, and the optimized operation parameter (35.46 m/s) of air current speed was obtained through theoretical analysis and experiments. The weight contents of an Al foil powder collector from vibrating screen-3 and LFP powder collector from bag-type dust collector are approximately 38.7% and 52.4%, respectively. The economic cost of full manual dismantling is higher than the recovery production line. This recycling system provides a feasible method for recycling spent LFP batteries.

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Mathematical modeling of cleaning dust-laden gas flows in the cyclone dust collector

Eastern-European Journal of Enterprise Technologies ◽

10.15587/1729-4061.2014.23351 ◽

2014 ◽

Vol 2 (10(68)) ◽

pp. 11

Author(s):

Дмитро Олександрович Серебрянський ◽

Сергій Володимирович Плашихін ◽

Юрій Олександрович Безносик ◽

Олександр Миколайович Набок

Keyword(s):

Mathematical Modeling ◽

Dust Collector ◽

Gas Flows ◽

Cyclone Dust Collector

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Impact of Nanoparticle Consolidation on Charge Separation Efficiency in Anatase TiO2 Films

Frontiers in Chemistry ◽

10.3389/fchem.2021.772116 ◽

2021 ◽

Vol 9 ◽

Author(s):

Karin Rettenmaier ◽

Thomas Berger

Keyword(s):

Thermal Annealing ◽

Charge Separation ◽

Separation Efficiency ◽

Internal Surface ◽

Processing Temperature ◽

Cyclic Voltammograms ◽

Internal Surface Area ◽

Deep Traps ◽

Charge Separation Efficiency ◽

The Impact

Mesoporous films and electrodes were prepared from aqueous slurries of isolated anatase TiO2 nanoparticles. The resulting layers were annealed in air at temperatures 100°C ≤ T ≤ 450°C upon preservation of internal surface area, crystallite size and particle size. The impact of processing temperature on charge separation efficiency in nanoparticle electrodes was tracked via photocurrent measurements in the presence of methanol as a hole acceptor. Thermal annealing leads to an increase of the saturated photocurrent and thus of the charge separation efficiency at positive potentials. Furthermore, a shift of capacitive peaks in the cyclic voltammograms of the nanoparticle electrodes points to the modification of the energy of deep traps. Population of these traps triggers recombination possibly due to the action of local electrostatic fields attracting photogenerated holes. Consequently, photocurrents saturate at potentials, at which deep traps are mostly depopulated. Charge separation efficiency was furthermore investigated for nanoparticle films and was tracked via the decomposition of hydrogen peroxide. Our observations evidence an increase of charge separation efficiency upon thermal annealing. The effect of particle consolidation, which we associate with minute atomic rearrangements at particle/particle contacts, is attributed to the energetic modification of deep traps and corresponding modifications of charge transport and recombination, respectively.

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Modeling the Separation of Microorganisms in Bioprocesses by Flotation

10.20944/preprints201808.0396.v1 ◽

2018 ◽

Author(s):

Stefan Schmideder ◽

Christoph Kirse ◽

Julia Hofinger ◽

Sascha Rollié ◽

Heiko Briesen

Keyword(s):

Fluid Dynamics ◽

Separation Efficiency ◽

Algebraic Model ◽

Balance Model ◽

Separation Processes ◽

Dissolved Air Flotation ◽

Computational Fluid Dynamics Cfd ◽

Cell Size Distributions ◽

Fermentation Broths ◽

The Impact

Bioprocesses for the production of renewable energies and materials lack efficient separation processes for the utilized microorganisms such as algae and yeasts. Dissolved air flotation (DAF) and microflotation are promising approaches to overcome this problem. The efficiency of these processes depends on the ability of microorganisms to aggregate with microbubbles in the flotation tank. In this study, different new or adapted aggregation models for microbubbles and microorganisms are compared and investigated for their range of suitability to predict the separation efficiency of microorganisms from fermentation broths. The complexity of the heteroaggregation models range from an algebraic model to a 2D population balance model (PBM) including the formation of clusters containing several bubbles and microorganisms. The effect of bubble and cell size distributions on the flotation efficiency is considered by applying PBMs, as well. To determine the impact of the model assumptions, the modeling approaches are compared and classified for their range of applicability. Evaluating computational fluid dynamics (CFD) of a DAF system shows the heterogeneity of the fluid dynamics in the flotation tank. Since analysis of the streamlines of the tank show negligible backmixing, the proposed aggregation models are coupled to the CFD data by applying a Lagrangian approach.

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Basic Examination of Small Micro-Plastics Collection using Cyclone Dust Collector

The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) ◽

10.1299/jsmermd.2021.1a1-b07 ◽

2021 ◽

Vol 2021 (0) ◽

pp. 1A1-B07

Author(s):

Masayoshi OZAWA ◽

Haruki TAKAHASHI ◽

Toshihiko SHIMIZU ◽

Masahiko SAKAI ◽

Tadahiro OYAMA

Keyword(s):

Dust Collector ◽

Cyclone Dust Collector ◽

Basic Examination

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On the particle cut size of cyclone dust collector. (Part 3). Relationship between the particle cut size dc and the equilibrium particle size dR=E.

Journal of the Society of Powder Technology Japan ◽

10.4164/sptj.28.27 ◽

1991 ◽

Vol 28 (1) ◽

pp. 27-33

Author(s):

Kikaku IKEMORI

Keyword(s):

Particle Size ◽

Dust Collector ◽

Cyclone Dust Collector

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Fluid Flow Phenomena and Droplet Size Distribution Along the Feed Spreader of Large Oil/Water Tank Separators

Volume 1: Symposia, Parts A, B and C ◽

10.1115/fedsm2009-78414 ◽

2009 ◽

Author(s):

Jose G. Severino ◽

Luis E. Gomez ◽

Steve J. Leibrandt ◽

Ram S. Mohan ◽

Ovadia Shoham

Keyword(s):

Size Distribution ◽

Droplet Size ◽

Separation Efficiency ◽

Droplet Size Distribution ◽

Separation Performance ◽

Water Tank ◽

Water Dispersion ◽

Flow Phenomena ◽

Oil Water ◽

The Impact

Large gravity separation tanks play an essential role in crude oil production in many fields worldwide. These tanks are used to separate water from an oil-rich stream before safely returning it to the environment. The oil/water dispersion enters the tanks through a feed spreader consisting of an array of pipes with small effluent nozzles. A major challenge is being able to predict oil/water dispersion distribution along the spreader as well as, the maximum water droplet size exiting through the effluent nozzles, under a given set of conditions. The capacity of the studied tank is 80,000 barrels (12,719 m3). Current feed stream is about 60,000 bpd (9,540 m3/day) of wet crude containing about 20% water by volume. A significant increase in flow rates and water volume fraction is anticipated [7], as more wells are added and existing ones mature. This work is aimed at investigating the separation performance of these tanks under current and future flow conditions; focusing primarily on the flow phenomena and droplet size distribution inside the spreader. The main objective is then to identify the impact of the spreader’s geometry and piping configuration on flow behavior and tank’s separation efficiency. The final product provides key information needed for mechanistic modeling the tank separation performance and optimizing tank components’ design. The feed spreader is simulated using Computational Fluid Dynamics (CFD) to assess oil/water flow distribution inside the network. Droplet size distribution along branch-pipes effluent nozzles in, including droplet breakup and coalescence has been studied using the Gomez mechanistic model [2] with input from CFD results. An experimental investigation of the spreader using a scaled prototype was also conducted to better understand flow phenomena and verify the CFD models. Results confirm the occurrence of significant maldistribution of the water and oil phases along the spreader that could impair separation efficiency.

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Development of a Household Vacuum Cleaner With a New Cyclone Dust Collector

Volume 1: Symposia, Parts A and B ◽

10.1115/fedsm2007-37014 ◽

2007 ◽

Author(s):

Shoji Hayashi ◽

Masatoshi Watanabe ◽

Yukiji Iwase ◽

Kyoichi Kanno ◽

Keiichi Fujimori

Keyword(s):

High Performance ◽

Three Dimensional ◽

Cartesian Grid ◽

Dust Collector ◽

Grid System ◽

Vacuum Cleaner ◽

Pressure Losses ◽

Stepped Surfaces ◽

Cyclone Dust Collector ◽

High Performance Computers

A household vacuum cleaner named “Tatsumaki cyclone” with a new cyclone dust collector was developed. It has a unique horizontal layout called the inverted cyclone layout that features a dust bunker adjacent to a cyclone cylinder with an up-draught airflow. It also has a new airflow arrangement called triple-suction airflow that separates airflow after removing dust at the cyclone cylinder. The main suction airflow is exhausted from the main port (which is downstream of the cyclone cylinder) through an inner cylinder. The sub-suction airflow is exhausted from the dust bunker after it heavily compresses the dust (sub port). The center suction airflow is exhausted from the center port. In this study, we used the Cartesian grid system to simulate the flow field inside the dust collector. This system uses only rectangular parallelepiped meshes; profiles of the dust collector were represented by stepped surfaces of cubic meshes. Each mesh was generated based on whether it was inside or outside the solid body of the dust collector. High-performance computers have recently been used to help generate super-fine meshes that fit closely the smooth shape of a dust collector. The Cartesian grid system has the advantage of being able to quickly generate square-meshes of complex shape that can be converted directly from the CAD data. We simulated the velocity distribution of single-suction, twin-suction and triple-suction models. The single-suction model had only a main port to exhaust airflow, the twin-suction model had a main port, and a sub port, and the triple-suction model had a main port, a sub port, and a center port. In this study, a Cartesian grid system with a finite difference method was used to correct the unsteady three-dimensional flows. After the simulation, we experimented with pressure losses and measured change in air quantity by the dust load of each model. These steps enabled us to develop a new cyclone dust collector called Tatsumaki cyclone as part of a compact household vacuum cleaner with lower pressure loss and a larger capacity dust bunker.

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