Working principle of the bag dust collector; In the process of the cloth bag dust when dusty gas through the filter material, dust were blocked on its surface, clean air gap discharge through filtering materials, air filtration technology is the basic principle of bag filter. Mainly has now used for air filtration fiber filtration, membrane filtration (or laminating film) and the dust layer filtration, these three ways can achieve the purpose of to isolate solid particles in the aerosol, but their separation mechanism is not the same. On the structure of bag filter mainly by:, middle and lower, slag and fly ash system mechanism etc. The stand or fall of bag precipitator performance is in addition to the right choice cloth material, ash removal system of bag filter plays an important decisive role.
Technical characteristics of bag filter, dust removal efficiency is as high as 99%, the number of the export gas dust concentration within 10 mg/m2, the fine dust of submicron particle size have the higher resolution, processing range is very wide, flue gas dust removal for industrial furnaces, reduced the emissions of air pollution, is not sensitive to the characteristics of the dust, not affected by the dust and resistance, use the high temperature resistant filter material such as glass fiber, P84 and ptfe, can be in more than 200 ℃, simple structure, convenient maintenance, under the same dust removal efficiency, and low cost than electrical precipitator.
Cloth bag dust remover is fiber filter, or the combination of membrane filtration and dust layer filtration, its dust removal mechanism is straining, inertia collision, hook attached, diffusion, a result of the combined action of gravity sedimentation and electrostatic effect.
(1) screen effect: when the particle diameter of the dust or the gap between the filter material fiber filter material between dust on a large pore, dust were blocked to stay, referred to as the screen effect. For commonly used fabric filter material, the effect is very small, because the space between the fibers often greater than the dust particle diameter. Just after the fabric on the deposition of dust, screen effect is fully displayed.
(2) the collision effect: when the dusty air close to the filter material fiber, air flow around the fiber, but 1 mu m more than large particles due to inertia effect, deviating from the air flow, retain the original direction, impact to the fiber, the dust was set down, called the collision effect.
(3) hook attached effect: when the dusty air close to the filter material fiber, fine dust remains within the streamline, the streamline more closely. If center radius is greater than the dust particles of dust fiber to the edge of the distance, the dust is captured, called hook attached effect.