Dust Removal Equipment

Bag Dust Collector: The bag 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 fibrous fabrics to filter dusty gases. As the dusty gas enters the bag 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 filtered through the filter material, where the dust is trapped, resulting in purified gas.

Working Principle

Baghouse dust collectors and granular bed dust collectors are included in the filtration systems. The former typically uses filter bags made of organic or inorganic fiber fabrics as the filtration layer, while the latter employs a filtration layer composed of particles of various sizes, such as quartz sand, river sand, ceramic beads, slag, graphite, carbon black, and ultrafine powder, etc.

As the powder repeatedly adheres to the outer surface of the filter bag, the powder layer thickens continuously, and the resistance value of the fabric bag dust collector also increases; 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, middle, and lower body (ash hopper), cleaning system, and discharge mechanism.

The performance of a bag dust collector depends not only on the correct selection of filter bag material but also on the dust removal system, which plays a decisive role. The dust removal 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. It is a widely used dust collector, commonly 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 dust particles (less than 5μm).

2. Cyclone Dust Collector: A type of dust removal equipment, the cyclone dust collector operates by causing the dusty air stream 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 from the bottom of the body in a tangential direction, rises in rotation, and the dust particles are separated by centrifugal force, thrown against the inner wall of the cylinder, and adsorbed by the water film layer flowing on the inner wall. They then flow to the bottom cone with the water, and are discharged through the dust outlet. The formation of the water film is achieved by several nozzles located at the top of the cylinder, which spray water tangentially to the wall. This creates a thin, downward-rotating water film that continuously covers the inner wall of the cylinder, enhancing the dust removal efficiency. This type of wet dust collector has a simple structure, low metal consumption, and low water consumption. However, its drawback is that it is tall, difficult to arrange, and during actual operation, water carryover is observed.