Patent ID: 9327224
Filing Date: 2016-05-03
CPC Classification: B01D

Claim Text:
1. A mechanical filter-based air pollution control system for removing particle and gas phase pollutants in a waste airstream exhausted from commercial cooking operations, comprising: a housing having an inlet and an outlet, an exhaust fan attached to the outlet for drawing the waste airstream into the inlet and through the housing to the outlet and discharging to the outside atmosphere, a fogger assembly arranged within the housing at the inlet and connected to a cold water source for spraying equal-sized 1 micrometer droplets to mix with the incoming waste airstream so as to achieve psychrometric saturation of the waste airstream, evaporative cooling of the airstream, and condensation of a portion of gas phase pollutants in the waste airstream into condensed particles, a first stage metal filter arranged within the housing and downstream of the fogger assembly for filtering particle pollutants, and solubilizing and removing by drainage polar particle and gas phase pollutants in the waste airstream, a second stage filter arranged within the housing and downstream of the first stage filter, the second stage filter including a wool layer attached to a MERV 15 synthetic media therein for removing particles, including the condensed particles, and gas phase pollutants remaining in the waste airstream after passing through the first stage filter, and a third stage filter arranged within the housing and downstream of the second stage filter, the third stage filter including an oil-mist media therein for removing sub-micron particle including the condensed particle pollutants remaining in the waste airstream after passing through the second stage filter.