Dust Collectors Baghouses and Cartridge Collectors Overview Dust

Dust Collectors Baghouses and Cartridge Collectors

Overview • Dust Collection • Collectors • Fabric Filters • Trends

Grain Loading HVAC Industrial • 0. 001 grains / ft 3 • 2, 000 CFM for 365 days • 150 lbs • 0. 1 to 100 grains / ft 3 • Industrial Ventilation – www. ACGIH. org – Design, 28 th Edition, $ 140 – 100 to 100, 000 times • • 5 grains / ft 3 2, 000 CFM for 365 days 750, 857 lbs 150 lbs in < 2 hours

Media Velocity HVAC Industrial • 2, 000 CFM through… • Filter Rate / Air to Cloth – 32 ft 2 Pleat – 100 ft 2 Box – 200 ft 2 HEPA > 60 FPM 20 FPM 10 FPM – 5 FPM – 0. 06 mph – 1 hour to walk a football field

Purpose of Pollution Control Comply - Collect - Protect • COMPLY with Regulations – EPA and OSHA • COLLECT Product • PROTECT Resources – Equipment and Occupants

Three C’s of Pollution Control • Capture • Convey • Collect

Pollution Control System • Pickup Points – Emission Source • • • Ductwork Dust Collector Removal System Fan Exhaust / Return

Pollution Control Components • Pickup Points – Emission Source • • • Ductwork Dust Collector Removal System Fan Exhaust / Return

Pollution Control Components • Dust Collector Types – Electrostatic Precipitators (ESP) – Wet Collectors – Dry Centrifugal – Fabric Collectors

Fabric Collectors • Baghouse – Shaker - Cleans Off Line – Reverse Air - Cleans Off Line – Pulse Jet - Cleans On Line

Fabric Collectors • Baghouse – Shaker - Cleans Off Line – Reverse Air - Cleans On Line – Pulse Jet - Cleans On Line

Fabric Collectors • Baghouse – Shaker - Cleans Off Line – Reverse Air - Cleans On Line – Pulse Jet - Cleans On Line • Cartridge Collector – Up flow – Cross flow – Down flow / Parallel flow

Pulse Jet Components • • • Inlet Distribution (1) Hopper Housing (2) Plenum (3) Tubesheet (4) Cleaning System – Header – Blow Pipe – Venturi

Cartridge Collector Components • • • Inlet Distribution Housing Hopper Tubesheet Plenum Cleaning System

Collector Considerations • Process Conditions – – – Temperature Pressure Moisture Chemistry Grain Load • Dust Properties – – – Particle Size Particle Shape Explosivity / Flamability Agglomeration Abrasive • Space Constraints – Footprint – Height • Capital Cost • Operating Costs – Media – Compressed Air – Energy / P • AIR FLOW

Fiber Tensile Abrasion Resist Acid Resist Alkali Resist Burns Temp F (Cont) Temp F (Surge) Cotton Good Poor Good Yes 180 200 Polypropylene Excellent Yes 170 200 Nylon Excellent Poor Excellent Yes 200 250 Wool Poor Fair Good Poor No 200 230 Homopolymer Acrylic Good Very Good Fair Yes 260 284 Copolymer Acrylic Average Fair Good Fair Yes 230 248 Polyester Excellent Fair Yes 275 300 Aramid Very Good Excellent Fair Good No 375 425 PTFE Average Fair Excellent No 450 500 Glass Excellent Fair Good Fair No 500 550 Ryton Very Good Excellent Very Good No 375 425 P 84 Very Good Excellent Very Good Fair No 500? 550?

Collector Considerations • Air Velocities – Inlet – Can / Interstitial – Media / ACR • Bags • Pleated 4 to 8 fpm 2 to 6 fpm

Example Application 4” Line 0. 09 ft 2 350 CFM 5” Line 0. 14 ft 2 545 CFM 6” Line 0. 20 ft 2 785 CFM 1, 880 CFM 0. 47 ft 2 10” Line at 3, 450 FPM 9” Line at 4, 260 FPM 3” Line 0. 05 ft 2 200 CFM 1, 880 CFM through 10” line to Model 25 S(6)-10

Collector Considerations • Air Velocities – Inlet – Can / Interstitial – Media / ACR Inlet Duct = 11” Round = 0. 66 ft 2 Inlet Velocity = 1, 880 CFM / 0. 66 ft 2 = 2, 850 FPM

Collector Considerations • Air Velocities – Inlet – Can / Interstitial – Media / ACR

Collector Considerations

Collector Considerations 42” • Air Velocities – Inlet 42” 12. 25 ft 2 – Can / Interstitial – Media / ACR Can Velocity = 1, 880 CFM / 12. 25 ft 2 = 155 FPM

Collector Considerations 42” • Air Velocities – Inlet 42” – Can / Interstitial – Media / ACR Interstitial Velocity = 1, 880 / 7. 35 = 255 FPM Interstitial = 255 / 155 = 1. 6 x Can Velocity Bag Bottom Area = Qty * * Radius 2 = 25 * 3. 14 * (3”)2 = 4. 9 ft 2 Interstitial Area = 12. 25 - 4. 9 ft 2 = 7. 35 ft 2

Collector Considerations • Air Velocities – Inlet – Can / Interstitial – Media / ACR

Collector Considerations • Air Velocities – Inlet – Can / Interstitial – Media / ACR Media Velocity = 1, 880/ 393 = 4. 8 FPM Bag Area = Qty * * Diameter * Length = 25 * 3. 14 * 6” * 120” = 393 ft 2

Collector Considerations • Air Velocities – Inlet – Can – Interstitial – Media / ACR – Exhaust 2, 850 FPM 155 FPM 255 FPM 4. 8 FPM 2, 500 FPM

Trends • New Equipment – – High inlets e. PTFE membrane fabric Pleated filters Multi-module for off-line cleaning and on-line maintenance • Baghouse Modifications – NFPA compliance – ESP / Shaker / Reverse Air conversions to Pulse Jet – Pleat conversions