Filter speed:
The filtration rate is an important factor in the design and selection of a bag filter. It is defined as the ratio of the speed at which the filtered gas passes through the filter, or the ratio of the volume of air passing through the filter to the area of the filter. The unit is expressed in m/min. The filter area of the bag filter is determined, then the size of the air flow to be treated depends on the selection of the filter speed. The formula is: Q = v × s × 60 (m3/h)
In the formula: Q — Process air volume v — Filter wind speed (m/min) s — Total filter area (m2) Note: Filter area (m2) = Process air volume (m3/h)/(Filter speed (m/min) x60 ) The filter speed of the bag filter is divided into the gross filter speed and the net filter speed. The so-called wool filter speed refers to the processing volume divided by the total filter area of the bag filter, while the net filter speed refers to the processing volume divided by the bag dust removal. Net filter area. In order to improve the cleaning effect and the ability to work continuously, the bag filter is divided into several chambers (or zones) in the design. Each chamber has a main valve to control the room in the filter state or stop the filter state (online Or offline status). When a room is cleaned or repaired, the main valve must be closed to stop filtration (offline state). At this time, the processing air volume is completely borne by other chambers. The total filtering area of other rooms is called the net filtering area. That is, the net filter area is the sum of the total filter area minus the number of cleaning chambers that must be maintained during operation and the number of maintenance rooms.
