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Dust Collectors Baghouses and Cartridge Collectors.

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Presentation on theme: "Dust Collectors Baghouses and Cartridge Collectors."— Presentation transcript:

1 Dust Collectors Baghouses and Cartridge Collectors

2 Overview Dust Collection Collectors Fabric Filters Trends

3 Grain Loading Industrial 0.1 to 100 grains / ft 3 –100 to 100,000 times 5 grains / ft 3 2,000 CFM for 365 days 750,857 lbs 150 lbs in < 2 hours HVAC grains / ft 3 2,000 CFM for 365 days 150 lbs Industrial Ventilation –www.ACGIH.org –Design, 28 th Edition, $ 140

4 Media Velocity Industrial Filter Rate / Air to Cloth –5 FPM –0.06 mph –1 hour to walk a football field HVAC 2,000 CFM through… –32 ft 2 Pleat> 60 FPM –100 ft 2 Box20 FPM –200 ft 2 HEPA10 FPM

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

6 Three C’s of Pollution Control Capture Convey Collect

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

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

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

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

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

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

13 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

14 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

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

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

17 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

18 FiberTensile Abrasio n Resist Acid Resist Alkali Resist Burns Temp F (Cont) Temp F (Surge) CottonGood PoorGoodYes PolypropyleneExcellent Yes NylonExcellent PoorExcellentYes WoolPoorFairGoodPoorNo Homopolymer Acrylic Good Very GoodFairYes Copolymer Acrylic AverageFairGoodFairYes Polyester Excelle nt Fair Yes Aramid Very Good ExcellentFairGoodNo PTFEAverageFairExcellent No GlassExcellentFairGoodFairNo Ryton Very Good Excellent Very GoodNo P84 Very Good ExcellentVery GoodFairNo500?550?

19 Collector Considerations Air Velocities –Inlet –Can / Interstitial –Media / ACR Bags4 to 8 fpm Pleated2 to 6 fpm

20 Example Application 1,880 CFM through 10” line to Model 25S(6)-10 4” Line 0.09 ft CFM 6” Line 0.20 ft CFM 5” Line 0.14 ft CFM 3” Line 0.05 ft CFM 1,880 CFM 0.47 ft 2 10” Line at 3,450 FPM 9” Line at 4,260 FPM

21 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

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

23 Collector Considerations

24 Air Velocities –Inlet –Can / Interstitial –Media / ACR ft 2 42” Can Velocity = 1,880 CFM / ft 2 = 155 FPM

25 Collector Considerations Air Velocities –Inlet –Can / Interstitial –Media / ACR 42” Bag Bottom Area = Qty *  * Radius 2 = 25 * 3.14 * (3”) 2 = 4.9 ft 2 Interstitial Area = ft 2 = 7.35 ft 2 Interstitial Velocity = 1,880 / 7.35 = 255 FPM Interstitial = 255 / 155 = 1.6 x Can Velocity

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

27 Collector Considerations Air Velocities –Inlet –Can / Interstitial –Media / ACR Bag Area = Qty *  * Diameter * Length = 25 * 3.14 * 6” * 120” = 393 ft 2 Media Velocity = 1,880/ 393 = 4.8 FPM

28 Collector Considerations Air Velocities –Inlet2,850 FPM –Can155 FPM –Interstitial255 FPM –Media / ACR4.8 FPM –Exhaust2,500 FPM

29 Trends New Equipment –High inlets –ePTFE 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


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