Bag-type dust collector refers to dust removal equipment that uses fiber filter bags to capture dust. When the dust-containing gas passes through the filter bag, the dust is separated on the outer surface of the filter bag, and the clean gas is discharged through the filter bag, thus achieving the purpose of dust removal. When the dust outside the filter bag accumulates to a certain extent, the wind resistance increases, which requires dust cleaning. The commonly used dust cleaning methods include pulse blowing, etc. Pulse blowing can be divided into "online blowing" and "offline blowing.
On-Line blowing is to place all the filter bags of the bag filter in a box, and the filter bags are arranged in several rows. The cleaning of dust is the spraying of the filter bags in rows. At this time, the rest of the filter bags in the bag filter are still in the filtering state, so it is called on-line cleaning of dust. When cleaning the dust online, although the filter bags that have been cleaned can not filter, but because the blowing time is very short, and the filter bags are cleaned one by one, the filtering effect can almost be regarded as continuous, so the compartment structure can not be adopted. However, for the convenience of overhaul, for large and medium-sized dust collectors, even if they are sprayed online, the compartment structure design is adopted.
Off-line blowing is to divide bag-type dust collector into several filter bag chambers, and then blow and clear the dust one by one. When cleaning the dust, the chamber stops filtering, so it is also called Air-stop blowing. Offline dust cleaning pulse bag filter is usually divided into multiple filter rooms. When it is necessary to clear dust, close the exhaust valve of the filter room, and the room stops working. High-pressure blowing gas quickly enters the room, making the filter bag vibrate, and the dust blocks gathered outside the filter bag break down. Usually after a few minutes, all the dust falls behind, the exhaust valve opens, and the room starts to work again.
When blowing online, the filter bag adjacent to the dust cleaning filter bag is still in the filtering state, and the cleaned dust is easy to be adsorbed again by the adjacent filter bag, resulting in incomplete dust cleaning. While blowing offline is to blow the dust cleaning under the condition of stopping filtering, and the dust cleaning time is long, so the dust cleaning is complete. At the same time, when cleaning the dust offline, the pressure of compressed air used for blowing is lower than that of online blowing when the same cleaning effect is achieved.