Using Cyclones Effectively at Cotton Gins

Whitelock, Derek P.; Armijo, Carlos B.; Buser, Michael D.; Hughs, S. E.

doi:10.13031/2013.27467

Cited by 10 publications

(7 citation statements)

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“…However, most cyclones have been designed to be suited for fine particle control [14][15][16]; until the present, no studies have been performed on using this system to control large particles, especially in the bio-processing industry field. No matter the type of cyclone in use, the cyclones must be sized correctly according to the airflow rate, correctly configured for the application, and properly constructed and maintained to perform at optimum efficiency [17].…”

Section: Introductionmentioning

confidence: 99%

True shape modeling of bio-particulate matter flow in an aero-cyclone separator using CFD–DEM simulation

2021

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The multi-phase flow of air and bio-particulate matter exists in many biological and environmental systems such as aerodynamic separating devices, fluidized bed combustion, and feed processing machinery. Integration of the computational fluid dynamics (CFD) and discrete element method (DEM) codes was performed to study bio-particle loading ratios' effect on the cyclone device performance. Every individual particle's behavior was captured by a DEM model using Newton's equations of motion, in which CFD modeled the continuum airflow for every computational cell scale through the Navier-Stokes equation. According to the high turbulence and chaotic behavior of the continuum airflow inside the cyclone separator, Reynolds stress turbulence model (RSM) was used. The particles used for testing and modeling were conducted on two mixture types of real-heterogeneous particulate matter, namely jojoba seeds and jojoba leaves, without any fly ash. The particles were geometrically modeled using their actual dimensions and shapes, considered the first head start research approach in the cyclonic separation and purification field. The influence of the interacting particle-particle and particle-boundary forces was taken into consideration. The numerical simulation results successfully predicted the cyclone performance at the designed conditions, which showed the best experimental data trend. These data are useful in future studies to modify the cyclone design and optimize bio-systems' operating conditions for separating the macroscopic particulate matter. Keywords Air-particle flow • Cyclonic separation • Computational fluid dynamics • Discrete element method List of symbols C d Drag coefficient C ij Fluid convection ds n Change in normal overlap at current time, s d v Spherical particle diameter, m d p Particle diameter, m D Domain diameter, m

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Section: Introductionmentioning

confidence: 99%

True shape modeling of bio-particulate matter flow in an aero-cyclone separator using CFD–DEM simulation

2021

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“…Consider replacing blast gates with variable frequency drives for systems that have blast gates. See the Cotton Ginners Handbook sections on pneumatic handling systems and air pollution abatement (Anthony and Mayfield, 1994) and "Using cyclones effectively at cotton gins" (Whitelock et al, 2009).…”

Section: A Dormant Season Repair Programmentioning

confidence: 99%

“…See the Cotton Ginners Handbook section on mechanical handling systems for more detail. Check cyclones for wear and leaks, replacing components as necessary (Whitelock et al, 2009). Check seed tubes for leaks and wear and the seed blower for proper functioning.…”

Section: Dormant Season Initial Inspectionmentioning

confidence: 99%

COTTON GINNERS HANDBOOK: A Comprehensive Gin Maintenance Program

Funk¹,

Hardin²

2019

JCS

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A comprehensive gin maintenance program is critical to optimizing the efficiency of a ginning system and affects labor, energy, and maintenance costs; safety, downtime, daily throughput, fiber properties, and customer satisfaction. A comprehensive gin maintenance program includes a sound maintenance philosophy, downtime and repair documentation and guidelines, a dormant season repair program, ginning season preventive maintenance, and a ginning season repair program. Implementing a comprehensive gin maintenance program in dormant and ginning seasons will minimize the frequency and length of downtime. This will maximize throughput, reducing energy and labor costs per bale, benefitting both the gin’s customers and its owners. Example downtime, inspection, repair and preventive maintenance reports are provided.

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“…While higher efficiency cyclones can be traded off somewhat against the more increased flow. , A high-efficiency cyclone of standard design will process only one-half or so as much gas as a high-flow design of the same diameter and overall height, operating at the same pressure drop . Therefore, it is essential to correctly size and configure the cyclone for the intended application to achieve maximum efficiency …”

Section: Introductionmentioning

confidence: 99%

“…21 Therefore, it is essential to correctly size and configure the cyclone for the intended application to achieve maximum efficiency. 22 Gas cyclone performance, including separation efficiency and pressure drop, is heavily impacted by its geometric configurations, including but not limited to dimensions of vortex finders, inlets, cylinders, and the type of inlet. 23 These factors have been the subject of extensive numerical research with experimental validation at different cyclone designs and operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Performance Analysis of Different Gas–Bioparticle Cyclone Separators: CFD–DEM Simulations

El-Emam,

Zhou,

Bai

et al. 2023

Ind. Eng. Chem. Res.

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This research presents a comprehensive study aimed at investigating the influence of different cyclone geometries on the flow field and performance in gas−bioparticle flows. Five distinct cyclone designs, including Stairmand high-efficiency (St 1 ), Stairmand high-flow (St 2 ), Swift high-efficiency (Sw 1 ), Swift highflow (Sw 2 ), and typical Lapple (TL), were involved. The investigation utilized a combination of computational fluid dynamics (CFD) and the discrete element method (DEM) to model the gas−particle behavior. The DEM accounted for the motion of individual particles using Newton's equations, while the CFD solved the Navier−Stokes equations to model the gas flow as a continuous medium. This numerical model successfully simulated the cyclone performance under three-dimensional (3D) true shape modeling of large-sized nonspherical bioparticles considering the particle−particle and particle−wall interaction forces. The experimental validation and verification of the model demonstrated an acceptable agreement with the simulated data. The findings revealed that cyclone dimensions significantly impacted both performance and particle behavior even when operating under identical conditions. Cyclones with matching dimensions between the bottom and vortex finder exhibited improved separation efficiency, while an increase in the vortex finder's diameter led to decreased efficiency, as in St 2 and Sw 2 cyclones. A comprehensive force analysis pinpointed regions of intense particle−wall collisions, predominantly at the cone wall apex and the wall opposite the cyclone inlet, particularly evident in St 1 , Sw 1 , and TL cyclones. Notably, particle−particle interaction forces played a crucial role in cyclone performance with increased separation efficiency observed due to particle collisions. The particle−gas forces, including drag and pressure gradient forces, were mainly affected in the inlet region and extended into the cylindrical part. The pressure gradient force exhibited a minimal impact on particle behavior. Among the cyclone designs tested, the Sw 1 cyclone demonstrated outstanding performance, achieving an impressive effectiveness of 94.4% under the given operational conditions. These findings provide a better understanding of the working mechanisms of gas−particle cyclones and similar swirling multiphase flow systems, allowing for improved optimization.

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Using Cyclones Effectively at Cotton Gins

Cited by 10 publications

References 0 publications

True shape modeling of bio-particulate matter flow in an aero-cyclone separator using CFD–DEM simulation

True shape modeling of bio-particulate matter flow in an aero-cyclone separator using CFD–DEM simulation

COTTON GINNERS HANDBOOK: A Comprehensive Gin Maintenance Program

Modeling and Performance Analysis of Different Gas–Bioparticle Cyclone Separators: CFD–DEM Simulations

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