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Round Filters in Dust Collection Baghouses and Cartridge Collectors
Todd Hensley, CAFS
Trenton, SC
Overview
ï Pollution Control
ï Collectors
ï Filters
ï Baghouse Conversions
Purpose of Pollution Control Comply - Collect - Protect
ï COMPLY with Regulations
ñ EPA and OSHA
ï COLLECT Product
ï PROTECT Resources
ñ Equipment and Occupants
Pollution Control Components
ï Pickup Points
ñ Emission Source
ï Ductwork
ï Dust Collector
ï Removal System
ï Air Mover / Fan
ï Exhaust / Stack
Pollution Control Components
ï Pickup Points
ñ Emission Source
ï Ductwork
ï Dust Collector
ï Removal System
ï Air Mover / Fan
ï Exhaust / Stack
Pollution Control Components
ï Dust Collectors
ñ 0.1 to 100 gr/cfm
ï Air Filters
ñ 0.001 gr/cfm
ï Source
ñ Industrial Ventilation ï www.ACGIH.org
ï 25th Edition, 2004
ï $100
ï Dust Collector Types
ñ Electrostatic Precipitators (ESP)
ñ Wet Collectors
ñ Dry Centrifugal
ñ Fabric Collectors
Fabric Collectors
ï Baghouse
ñ Shaker - Cleans Off Line
ñ Reverse Air - Cleans On Line
ñ Pulse Jet - Cleans On Line
Fabric Collectors
ï Baghouse
ñ Shaker - Cleans Off Line
ñ Reverse Air - Cleans On Line
ñ Pulse Jet - Cleans On Line
ï Cartridge Collector
ñ Up flow
ñ Cross flow / Up flow
ñ Down flow / Parallel flow
Pulse Jet Components
ï Inlet Distribution
ï Hopper
ï Housing
ï Tubesheet
ï Plenum
ï Cleaning System
ñ Blow Pipe / Others
ñ Venturi
Cartridge Collector Components
ï Inlet Distribution
ï Hopper
ï Housing
ï Tubesheet
ï Plenum
ï Cleaning System
Collector Considerations
ï Air Properties
ñ Air Flow
ñ Temperature
ñ Moisture
ñ Explosivity
ñ Chemistry
ï Dust Properties
ñ Particle Size / Shape
ñ Grain Load
ï Space Constraints
ñ Footprint
ñ Height
ï Capital Cost
ï Operating Costs
ñ Media
ñ Compressed Air
ñ Energy / DP
ï AIR TO CLOTH
Collector Considerations
ï Air Velocity
ñ Inlet Velocity
ñ Can Velocity
ñ Interstitial Velocity
ñ Media Velocity
ï Air to Cloth / A:C
ï Bags 4 to 8 fpm
ï Pleated 2 to 6 fpm
Inlet Duct = 12î Round = 0.8 SF Inlet Velocity = 3000 CFM / 0.8 SF = 3750 FPM
Collector Considerations
ï Air Velocity
ñ Inlet Velocity
ñ Can Velocity
ñ Interstitial Velocity
ñ Media Velocity
Collector Considerations
ï Air Velocity
ñ Inlet Velocity
ñ Can Velocity
ñ Interstitial Velocity
ñ Media Velocity
11.1 Sq Feet 40î
40î
Can Velocity = 3000 CFM / 11.1 SF = 270 FPM
Collector Considerations
ï Air Velocity
ñ Inlet Velocity
ñ Can Velocity
ñ Interstitial Velocity
ñ Media Velocity
40î
40î
Bag Bottom Area = Qty * p * Radius2
= 25 * 3.14 * (3î)2 = 4.9 Sq Feet Interstitial Area = 11.1 - 4.9 Sq Feet = 6.2 Sq Feet
Interstitial Velocity = 3000 / 6.2 = 480 FPM Interstitial = 1.8x Can Velocity
Collector Considerations
ï Air Velocity
ñ Inlet Velocity
ñ Can Velocity
ñ Interstitial Velocity
ñ Media Velocity
40î
40î
Bag Area = Qty * p * Diameter * Length
= 25 * 3.14 * 6î * 120î = 393 Sq Feet
Media Velocity = 3000 / 393 = 7.6 FPM
Collector Considerations
ï Air Velocity
ñ Inlet Velocity 3750 FPM
ñ Can Velocity 270 FPM
ñ Interstitial Velocity 480 FPM
ñ Media Velocity 7.6 FPM
Collector Considerations
ï Baghouses
ñ Can Change ï Media Type
ï Media Area
ï Filter Type
ï Length
ñ Cannot Change ï Tubesheet Hole
ï Cartridge Collectors
ñ Can Change ï Media Type
ï Media Area
ï Materials
ñ Cannot Change ï Envelope Size
ï Cap Design
Filter Considerations Bag Fabric
ï Felted Fiber
ñ Polypropylene PP
ñ Polyester PET
ñ Aramid Nomex
ñ Polyphenylene Sulfide PPS
ñ Polyimide P84
ñ Fiberglass
ï Basis Weight oz / sq yd
ï Finish
ñ Singed / Glazed
ñ Metallized
ñ Epitropic
ñ HydroOleophobic
ñ Membrane
ï Support
ñ Fiber
ñ Scrim
Filter Considerations Fiber Properties
Filter Considerations Pleated Bag
ï Fabric
ñ Spunbond Polyester ï Epitropic / Metallized
ï HydroOleophobic
ï Membrane
ñ Pleatable Felts ï Membrane
ñ Area ï Pleat Count / Height
ï Limited Length
ï Felt Thickness
ï Construction
ñ Installation ï Top Load
ï Bottom Load
ï Tubesheet Seal
ñ Materials ï Potting Compounds
ï Core
ñ Retainer ï Bands
Filter Considerations Cartridge
ï Fabric
ñ Spunbond Polyester ï Epitropic / Metallized
ï HydroOleophobic
ï Membrane
ñ Pleatable Felts ï Membrane
ñ Area ï Pleat Count / Height
ï Limited Length
ï Felt Thickness
ï Construction
ñ Installation ï Open / Open
ï Open / Closed
ï Flanged Cap
ñ Materials ï Potting Compounds
ï Core
ñ Retainer ï Bands
ï Cage
Baghouse Conversion
ï Original with 3000 CFM
ñ 25 PET Felt Bags
ñ 6î OD x 120î OAL
ñ Fabric 393 SF
ñ Inlet 3750 CFM
ñ Interstitial 480 FPM
ñ Media 7.6 FPM
ñ Problems ï High Pressure Drop
ï Bag Wear
Baghouse Conversion
ï Original
ñ 25 Bags
ñ 6î OD x 120î OAL
ñ 393 Sq Feet
ï Pleated Bags
ñ 6î OD x 72î OAL ï 45 Pleats at 1î
ñ 1,078 Sq Feet ï 175% more fabric
Baghouse Conversion
ï Original
ñ 25 Bags
ñ 6î OD x 120î OAL
ñ 393 Sq Feet
ï Pleated Bags
ñ 6î OD x 72î OAL ï 45 Pleats at 1î
ñ 1,078 Sq Feet ï 175% more fabric
ï Replace all of the bags
ñ Lower Air to Cloth ï From 7.6 to 2.8 FPM
ñ Gain Efficiency ï Better Media
ï Lower A:C
ñ Lower Pressure Drop ï Better Pulse Cleaning
ñ Drop Out Zone Adds 4í
Baghouse Conversion
ï Replace 10 and Plug 15
ñ Lower Air to Cloth ï From 7.6 to 7.0 FPM
ñ Gain Efficiency ï Better Media
ï Lower A:C
ñ Cut Interstitial Velocity ï From 480 to 330 FPM
ñ Drop Out Zone adds 4í
Questions