Dust-removing cloth bags are generally divided into pulse-type dust-removing filter bags, vibrating dust-removing cloth bags, and back-flush dust-removing cloth bags according to the cleaning method. Depending on the shape, there are round bag type, flat bag type, and envelope type. Dust bag also has different bag mouth and bag bottom design options.
Dust bag is used in flue gas treatment dust removal systems in ironworks, steel mills, ferroalloy plants, refractory plants, foundries, power plants, etc. Flue gas filtration of waste incinerators, coal-fired boilers, fluidized bed boilers, etc. Asphalt concrete mixing, building materials " target=_blank> building materials, cement ceramics, lime, gypsum and other production sites. Aluminum electrolysis, lead, tin, zinc, copper and other rare metals smelting flue gas filtration, fine material recovery, liquid and solid separation Liquid-solid separation and fine material recovery in the fields of chemical industry, coke, carbon black, dyes, pharmaceuticals and plastics.
The filtration process of the dust bag filter can be divided into two stages in a time series, namely a stable filtration and an unstable filtration stage. In the stable filtration stage, it is assumed that the deposition of the flicker particles produces a transformation of the filter cloth structure, and the particles are caught in contact with the fibers, and the correction of the filtration mechanism is not considered. Therefore, the collection efficiency is not affected by the filtration time, and the filtration time increases. The gradual formation of particles in the surface of the fiber leads to an unstable filtration stage, and the change of the void ratio of the filter cloth is favorable for the deposition of the particles, which leads to an increase in the collection efficiency, which increases with the filtration time and the amount of particle deposition. In the clean state, the single fiber capture efficiency is defined as the ratio of the height of the ballistic trajectory entrance to the fiber diameter. In the actual filtration process, the formation and size of the fiber change significantly with time. Studies have shown that, in general, single fiber capture efficiency increases linearly with particle deposition. The collection efficiency of the unsteady filtration process is a function of fiber packing density, fiber diameter, single fiber collection efficiency, filtration rate, initial concentration of dust particles, total deposition quality of dust particles, and filtration time.
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