Dust Removal Equipment
Baghouse Dust Collector: A baghouse dust collector is a dry dust removal device. It is suitable for capturing fine, dry, non-fibrous dust. The filter bags are made of woven fabric or non-woven felt, utilizing the filtering effect of the fibrous fabric to filter the dusty gas. When the dusty gas enters the baghouse dust collector, particles with large size and high density settle down due to gravity, falling into the ash hopper. The gas containing finer dust is retained by the filter material as it passes through, thereby purifying the gas.
Working Principle
The dust removal equipment includes bag dust collectors and granular bed dust collectors. The former typically uses filter bags made of organic or inorganic fiber fabrics as the filtering layer, while the latter often employs a filtering layer composed of particles of various sizes, such as quartz sand, river sand, ceramic beads, slag, graphite, carbon black, and micro-powders, etc.
As the powder repeatedly adheres to the outer surface of the filter bag, the powder layer continually thickens, increasing the resistance value of the fabric dust collector; the pulse valve diaphragm issues a command, and when submerged from both sides, the pulse valve opens, allowing compressed air from the high-pressure air bag to flow through. If there is no dust or it is reduced to a certain extent, the mechanical cleaning process will cease.
The bag dust collector consists mainly of the upper housing, middle housing, lower housing (ash hopper), cleaning system, and discharge mechanism, etc.
The performance of a bag dust collector is largely determined by the correct selection of filter bag material, with the cleaning system playing a decisive role. Therefore, the cleaning method is one of the characteristics that differentiate bag dust collectors and is a crucial aspect of their operation. It falls under the category of medium-efficiency dust collectors and can be used for the purification of high-temperature flue gases, making it a widely used type of dust collector, often applied in boiler flue gas dust removal, multi-stage dust removal, and pre-dust removal. Its main drawback is the relatively low efficiency in removing fine particles (<5μm).
2. Cyclone Dust Collector: A type of dust removal equipment, the cyclone dust collector operates by causing the dust-laden air to rotate, separating and trapping dust particles against the wall of the collector with centrifugal force, and then allowing the particles to fall into the ash hopper under the force of gravity.
3. Water Film Dust Collector: Dust-laden gas is introduced into the lower part of the筒体in a tangential direction, rises in rotation, and the dust particles are separated due to centrifugal force, thrown against the inner wall of the筒体, and adsorbed by the water film layer flowing on the inner wall. They then flow to the bottom cone and are discharged through the dust outlet. The water film is formed by several nozzles located at the top of the筒体, which spray water tangentially to the wall. This way, a thin, rotating downward water film is always present on the inner wall of the筒体, achieving the purpose of enhancing dust removal efficiency. This wet-type dust collector has a simple structure, low metal consumption, and low water consumption. Its drawbacks include a high height, difficulty in arrangement, and the presence of water droplets observed during actual operation.
