Bag dust collectors are a dry dust removal device. They are suitable for capturing fine, dry, non-fibrous dust. The filter bags are made of woven fabric or non-woven felt, utilizing the filtering effect of the fiber fabric to filter dust-laden gas. When the dust-laden gas enters the bag dust collector, the larger, denser dust particles settle due to gravity, falling into the ash hopper. The gas containing finer dust particles is retained by the filter material as it passes through, resulting in gas purification.