Baghouse Filter (2D) — dust cake, pressure drop and pulse-jet cleaning

Switch to 3D
Filter settings
Pressure drop
Air-to-cloth
Cake load
Efficiency
Emission
Fan power
Pulses so far
Hopper dust
What to try
  • Double the gas flow: the air-to-cloth ratio doubles, the cake grows faster (∝ V) and resistance rises (∝ V²), so cleaning gets frequent.
  • Set the trigger pressure low: many pulses, little cake, but emissions rise right after each pulse.
  • Add bags to cut the air-to-cloth ratio: pressure drop and fan power fall.
The science

Filter-cake law: ΔP = SE V + K2 V W, with face velocity V = Q / A (air-to-cloth ratio), fabric resistance SE, specific cake resistance K2 and cake areal load W (kg/m²). The cake grows as dW/dt = C V η, with inlet dust concentration C and collection efficiency η. Hence ΔP rises linearly in time (for constant V) until the pulse-jet cleaning trigger, which removes a fraction of the cake.

Collection efficiency rises with cake load: η = η0 + (ηmax − η0)(1 − e−W/Wc) because the dust layer is itself the filter. Fan power P = Q ΔP / ηfan.

Simplifications: uniform cake over all bags, constant gas properties, one dust type, perfect off-line cleaning fraction, no re-entrainment or fabric ageing. Resistances are illustrative values in the industrial range (1–2.5 kPa), not a design basis.