... people regard the bag as the heart of filter bag, what kind of flue gas that the filter bag can ... gas from calcium carbide plant, casting, flue gas of steel smelting, gypsum concrete gas, fire-resisting brick ... -collecting, only using the bag or others because of the mass resistively limit, the second reason is ... is limited, the third is because of the sulphur content of the flue gas, and the powder ...