Introduction to Baghouse / Fabric Filters: Design Criteria

Ideal air-to-cloth ratios for fabric filters:

  • Reverse Gas 1.75:1 “ 2.50:1
  • Pulse Jet 3.25:1 “ 4.00:1
  • Shaker 2.0:1 “ 2.50:1

P/J System Recommendations

  • High and hi-hi hopper level indicators
  • Vacuum breaks for top access door
  • Inlet injection ports for pre-coat and leak dye
  • Lay-down area for bags and cage storage
  • Redundant compressed air systems
  • Quality compressed air dryers

P/J Can Velocity

  • Air volume
  • Compartment area (LxW = ft2, measured at bottom of bags
  • Bag area (# of bags x area of bag bottom = ft2)
  • Open area (collector area “ bag bottom area)
  • Can velocity = (air volume ÷ open area)
  • Typical P/J can velocity: 200-400 feet per min

R/A System Recommendations

  • Quality isolation dampers and actuators (poppet type)
  • High and hi-hi hopper level indicators
  • Vacuum breaks for top access door
  • Inlet injection ports for pre-coat and leak dye
  • Lay-down area for bags and cage storage
  • Redundant reverse air fans
  • Reverse air recirculation system
  • Piping for acoustic horns even if not initially installed

Instrumentation Functions

  • Differential pressure for entire baghouse and individual compartments
  • Inlet and outlet temperature (dew points)
  • Emission monitoring for individual compartments (broken bag detectors)
  • Reverse gas temperature and pressure
  • Compressed air PSI, temp, and flow rate
  • Damper positions
  • Acoustic horn sounding time and PSI
  • High and hi-hi hopper level indicators
  • Filter bag permeability tester

 

Helpful Resources

KnowledgeBase: Baghouse Design Factors

KnowledgeBase: Common Baghouse Misconceptions

KnowledgeBase: Types of Fabric Filters

Our Capabilities: Asset Lifecycle Management

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