Dust Removal Equipment

Bag dust collector: A bag dust collector is a dry-type dust removal device suitable for capturing fine, dry, non-fibrous dust. The filter bags are made of woven filter cloth or non-woven felt, utilizing the filtering action of fibrous fabrics to filter dust-laden gases. Upon entering the bag dust collector, larger and heavier particles settle due to gravity, falling into the ash hopper. The gas containing finer dust particles is trapped by the filter material during passage, thereby purifying the gas.

Operating Principle

Baghouse dust collectors and granular bed dust collectors are included in the filtration type dust removal devices. The former typically uses filter bags made of organic or inorganic fiber fabrics as the filtration layer, while the latter often employs a mixture of particles of various sizes, such as quartz sand, river sand, ceramic beads, slag, graphite, carbon black, and micro-powders, to form the filtration layer.

As the powder repeatedly adheres to the outer surface of the filter bag, the powder layer continues to thicken, and the resistance value of the bag dust collector increases accordingly; the pulse valve diaphragm issues a command, and the pulse valve opens when submerged from both sides. The compressed air in the high-pressure air tank is released. If there is no dust or it is reduced to a certain extent, the mechanical cleaning operation will cease.

The bag dust collector consists mainly of the upper housing, middle housing, lower housing (ash hopper), cleaning system, and discharge mechanism, etc.

Baghouse dust collector performance largely depends on the correct selection of filter bag material, with the cleaning system playing a decisive role. The cleaning method is one of the distinguishing characteristics of baghouse dust collectors and a crucial aspect of their operation. It falls under the category of medium-efficiency dust collectors, is suitable for purifying high-temperature flue gases, and is a widely used dust collector, commonly applied in boiler flue gas purification, multi-stage dust collection, and pre-dust removal. Its main drawback is the relatively low removal efficiency for fine dust particles (<5μm).

2. Cyclone Dust Collector: A type of dust removal device, the cyclone dust collector operates by causing the dusty air flow 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: Dusty gas is introduced into the lower part of the body in a tangential direction and rises in rotation. Dust particles are separated by centrifugal force and thrown to the inner wall of the cylinder, where they are adsorbed by the flowing water film layer inside the cylinder. They then flow to the bottom cone with the water stream and are discharged through the dust outlet. The formation of the water film is achieved by several nozzles located at the upper part of the cylinder, which spray water tangentially to the wall. This ensures that a thin, rotating downward water film is always present on the inner wall of the cylinder, thereby enhancing the dust removal efficiency. This type of wet dust collector has a simple structure, low metal consumption, and low water consumption. However, its drawbacks include a large height, difficulty in arrangement, and the presence of water in the operation.