Reducing cyclone pressure drop with evasés

Funk, Paul

doi:10.1016/j.powtec.2014.12.019

Cited by 16 publications

(5 citation statements)

References 29 publications

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“…Where dust cyclone inlet velocity is above that required to comply with state regulations or the gin's operating permit, energy use can be reduced by meeting, but not exceeding, the minimum inlet velocity (typically 16.26 ± 2.03 m s − 1 [3200 ± 400 fpm]). Cyclone pressure drop also can be reduced by up to 11.9% by including an expanding flow section (evasé) on the cyclone discharge in jurisdictions where this is permitted (Funk, 2015). Figure 3 illustrates a radial evasé.…”

Section: Reducing Electricity Usementioning

confidence: 99%

COTTON GINNING HANDBOOK: Energy Utilization and Conservation in Cotton Gins

Funk¹,

Hardin²

2017

JCS

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Gins have become more energy efficient. However, energy costs account for 25% of the total variable costs of ginning, including seasonal labor, increasing from 15% in 1994. Recent studies found that average electricity use at gins is approximately 35 kWh per bale, down from 53 kWh per bale reported in 1980. However, gins must continue to increase efficiency to remain profitable and consumers are increasingly concerned with the sustainability of textile products. This paper reviews recent research on energy use and conservation in cotton gins and offers suggestions on ways for gin managers to reduce energy use based on this research. Gins should focus on maximizing their ginning rate and sustaining this rate as much as possible during the ginning season. Increased ginning rates will reduce per-bale costs of not only electricity and fuel, but labor as well. Maintaining consistent material flow through the gin, matching equipment capacities, and minimizing downtime allows gins to produce more bales per shift. More than half the electricity at gins is used for material handling, primarily by the large centrifugal fans used to convey materials. The cost of conveying materials should be considered when designing or updating gins. Gins should use only the volume of air necessary for consistent conveying and adequate drying and need to eliminate unnecessary friction losses in conveying systems. To reduce fuel use, dryer control systems should be used to avoid excessive drying of cotton. Insulating drying systems might be economically feasible, particularly from the burner to the mixpoint. Gins also should consider strategies to reduce the prices paid for electricity and fuel.

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Section: Reducing Electricity Usementioning

confidence: 99%

COTTON GINNING HANDBOOK: Energy Utilization and Conservation in Cotton Gins

Funk¹,

Hardin²

2017

JCS

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“…Whereas doubling the vortex finder length increases the pressure drop by 25%. Funk (2015) experimentally studied the effect of changing the vortex finder shape on the cyclone performance by adding rectangular and radial evases on the exit pipe outlet section. The results showed that adding radial evases reduces the cyclone pressure drop by 8.7 to 11.9%.…”

Section: Introductionmentioning

confidence: 99%

Studying the effect of vortex finder eccentricity on the gas cyclone performance

Helmy

Elsayed

Sedrak

2019

Engineering Research Journal

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In this study, cyclone separator, with nine different vortex finder eccentricities are simulated computationally (CFD). The numerical technique is based upon solving three dimensional, incompressible, turbulent flow governing equations using the Reynolds stress turbulent model. The results show that moving the vortex finder eccentricities in two directions is more effective than moving it in one direction only. Case 5 achieves the lowest pressure drop where the vortex finder eccentricity is moved in the positive x and y directions toward the cyclone inlet. It is found that moving the eccentricities in both x, y directions towards the cyclone inlet reduces the pressure drops by 31% and decreases the collection efficiency by 17.4% compared to case 0 (where the vortex finder is concentric in the cyclone centerline).

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“…A number of deswirlers have been investigated experimentally and only one numerically , but their effects on cyclone performance are somewhat contradictory and further investigations are needed. For example, Shepherd and Lapple experimentally analyzed a cyclone fitted with straightening vanes with curved blades as well as vanes with straight vertical blades.…”

Section: Introductionmentioning

confidence: 99%

“…Untwisting devices placed at the gas outlet, such as evasés and others, are assumed to not affect the cyclone separation efficiency . Noriler et al numerically investigated the fluid flow in two types of cyclones fitted with a mechanical device for reducing pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation Investigation of an Industrial Cyclone Separator Fitted with a Pressure Recovery Deswirler

2017

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A cyclone fitted with a deswirler of original design has been investigated by means of large eddy simulation. Installation of the deswirler reduces significantly the positive static pressure near the wall as well as the negative static pressure in the central region. It also decreases the maximum tangential velocities in the main separation zone. The deswirler enables a substantial reduction of the backward flow at the gas outlet and a more uniform distribution of the axial velocities at the gas outlet. It also considerably reduces pressure losses in the vortex finder lowering the cyclone pressure drop by almost about one third but it deteriorates the collection efficiency of particles with diameters of less than 8 mm, thus increasing the cut size.

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Reducing cyclone pressure drop with evasés

Cited by 16 publications

References 29 publications

COTTON GINNING HANDBOOK: Energy Utilization and Conservation in Cotton Gins

COTTON GINNING HANDBOOK: Energy Utilization and Conservation in Cotton Gins

Studying the effect of vortex finder eccentricity on the gas cyclone performance

Large Eddy Simulation Investigation of an Industrial Cyclone Separator Fitted with a Pressure Recovery Deswirler

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