Dust Removal Equipment

Dust Removal Equipment

Bag Dust Collector: A bag dust collector is a dry dust removal device 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 fiber fabric to filter the dusty gas. 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 retained by the filter material as it passes through, 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 filter 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 continually thickens, 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 cylinder 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 body, middle body, lower body (dust pan), cleaning system, and discharge mechanism, etc.

The performance of a bag dust collector is crucially dependent on not only the correct selection of filter bag material but also the cleaning system, which plays a decisive role. Therefore, the cleaning method is one of the distinguishing characteristics of a bag dust collector and an essential aspect of its operation. It falls under the category of medium-efficiency dust collectors and is suitable for purifying high-temperature flue gases, making it a widely used 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 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: Dust-laden gas is introduced from the bottom of the body in a tangential direction and rises in rotation. Dust particles are separated by centrifugal force and thrown against the inner wall of the cylinder, where they are adsorbed by the water film layer flowing on the inner wall. They then flow to the bottom cone with the water stream and are discharged through the dust outlet. The water film is formed by several nozzles located at the top of the cylinder, which spray water tangentially onto the wall. This ensures that a thin, rotating water film flows downward 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 carryover observed during actual operation.