Precipitator: dust separated from the flue gas equipment called a filter or dust removal equipment. We have the experience of wearing a mask, a mask is a simple filter dust removal equipment. Dust removal mechanism of dust removal equipment is very simple, it masks for dust removal mechanism is through the filter material to achieve the mechanical treatment of the fly ash particles in the flue gas. In addition, the first received fly ash particles in the filter surface also formed a stable layer of dense gray layer (commonly known as filter cake or filter bed), it played a very good filter, especially to do with the preparation of cloth filter bag dust removal equipment, this layer of the filter bed has played a major role in filtering. 
 The dust collector according to the action principle is divided into the following five categories: 
 (1) mechanical force dust removal equipment, including dust removal equipment gravity, inertia and dust removal equipment, centrifugal dust removal equipment. 
 (2) washing the dust removal equipment, including water bath dust removal equipment, foam dust removal equipment, the Venturi tube dust removal equipment, water film dust removal equipment. 
 (3) filter dust removal equipment including bag filter and granular layer of dust removal equipment 
 (4) electrostatic dust removal equipment. 
 (5) magnetic dust removal equipment.