Electrostatic phenomena in bag filtration of industrial gases

Electrostatic phenomena in gas filtration are studied. The magnitude and sign of the generated charge depends on the type of filter fabric, its structure and condition, and the composition of the dust removed. According to research during the introduction of bag filters for open ferroalloy furnaces at Chelyabinsk Electrometallurgical Works, existing methods of preventing static electricity are not able to neutralize the charges. Experiments indicate that the development of an electric field in the filter complicates its regeneration and hence disrupts filter operation; and that stable filter operation may be ensured by strict regeneration conditions. The charge generated by the filter fabric is not the dominant factor in the filtration of dusty gas. The sign of the charge largely depends on the composition of the dust present in the gas.