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　　First, in Medium-frequency electric furnace A dust-proof cover (capture hood) is installed above the furnace opening. The dust-proof cover is connected to a duct, which in turn is linked to a baghouse dust collector located outside the workshop. The flue gas and dust generated are drawn into the duct through the capture hood and then conveyed via the duct to the baghouse casing for filtration of the flue gas and dust. The filtered dust settles into a dust hopper and is periodically discharged for centralized treatment. Depending on the user’s operational practices during the smelting process, the dust capture hood can be designed for top suction or side suction. Additionally, the dust capture hood can be equipped with a rotating function for even greater convenience.

　　Dust-laden gas enters the dust hopper through the inlet or is introduced into the filter bag chamber via an open flange. As the dust-laden gas passes through the filter bags, the dust is filtered out, leaving clean gas that flows into the clean-air chamber. From there, the clean gas is discharged through the exhaust port of the clean-air chamber by a fan. Dust accumulates on the outer surface of the filter bags and continues to build up, thereby increasing the resistance of the baghouse dust collector. To ensure... Medium-frequency electric furnace The resistance should not exceed 1200 Pa. To ensure that the baghouse dust collector can continue operating, the dust on the filter bags must be removed regularly.

　　Dust removal is achieved by the programmable controller periodically and sequentially activating pulse valves, which cause compressed air (0.5–0.7 MPa) stored in air bags to be ejected through the nozzles (referred to as primary air). The surrounding ambient air (referred to as secondary air), which is several times greater in volume than the primary air, flows into the filter bags via a Venturi tube. The Venturi tube expands rapidly in an instant and, in a direction opposite to the airflow, flings away the dust, thereby achieving the purpose of dust removal.

　　Basic structure of an intermediate-frequency induction furnace dust collector:

　　1. Medium-frequency induction furnace casing components: The casing consists of the upper casing (air purification chamber), the middle casing (filtration chamber), the lower casing (dust hopper), a flue gas distributor, a ceiling plate, a platform, ladders, support feet, air inlets, ash discharge ports, thermal insulation, and color plates, among other elements.

　　2. Dust-removal filter bag assembly: The filter bag frame, dust removal filter bags, and bag-hanging mechanisms are designed with self-locking devices for easy installation and replacement, effectively extending the service life of the filter bags. The filter bag specifications include three models: φ130×6000mm, φ160×6000mm, and φ160×700mm. These bags are made from polyphenylene sulfide needle-felt (imported PPS/PPS504CSL7, with water- and oil-resistant treatment).

　　3. Flow-guiding device: Adopting an advanced O-shaped air intake method and featuring a uniquely designed flue gas distribution device, this system not only efficiently distributes dust-laden gases but also separates large particles, thereby preventing the dust-laden gases from directly impacting the filter bags. This further enhances dust removal efficiency and extends the service life of the filter bags.

　　4. Pulse-jet cleaning system: The system consists of a reverse-air manifold, solenoid pulse valves, pressure-rated connectors, nozzle tubes, brackets, and other components. For models below Hgdm-5.6, the entire chamber is cleaned; for other models, each filter bag is equipped with a compressed-air nozzle tube at its upper portion. During operation, the system typically performs a pulse-backblowing cycle every 10 seconds for each row of filter bags. The solenoid valves are periodically activated to inject pulsed compressed air into the filter bags for dust removal. Medium-frequency induction furnace

　　5. Ash Discharge System: Composed of an electric vibrator (air monitor), an electric heater, and an ash level indicator. The electric vibrator (air monitor) ensures that the dust has good flowability.

　　6. Control System: The system primarily consists of a pulse injection controller, a PLC-based computer control cabinet, resistance thermometers, static pressure measurement points, level gauges, and sensing elements.

　　7. Offline protection system: The system mainly consists of a bypass valve, differential pressure device, level gauge, thermometer, pressure detection device, pulse controller, and filter bag leak detection device. When the flue gas temperature becomes too high or re-burning occurs at the boiler’s rear end, water is sprayed to prevent the combustion of filter bags.