VOD/VD Refining Furnace with 67Pa Vacuum Degree for Efficient Dehydrogenation and Denitrification in Industrial Smelting
Description de produit
Metal & Metallurgy Machinery of VOD/VD Refining Furnace Iron Melting Furnace
Product Description
Refining Process Description of VD Furnace
1. Dehydrogenation When vacuum degree reaches ≤133Pa, hydrogen content in molten steel [H] is ≤1.5 ppm. To ensure this level and improve dehydrogenation rate, the working vacuum degree is maintained below 67Pa, accounting for variables like operating process, steel grade, raw material state, and argon stirring.
2. Denitrification While nitrogen content relates to alloy elements in steel and is difficult to remove, we recommend reducing nitrogen content before VD treatment and extending treatment time for optimal results.
3. Desulfurization Sulfur content in steel maintains a constant proportion with oxygen. The vacuum treatment's deoxidation process simultaneously serves as desulfurization. For ultra-low sulfur steel grades, desulfurizers with strong sulfur affinity are utilized.
4. Argon Stirring Argon is blown through ladle's breathable brick to circulate molten steel, enhancing physical and chemical reactions. Our design features independent argon flow adjustment systems with mass flow control modules for precise automatic regulation.
Technological Process
VD Process: Bridge crane transports refined molten steel ladle from LF furnace to vacuum tank. Vacuum cover truck moves to treatment station for temperature measurement and sampling. Vacuum tank lid descends and seals. Vacuum pump activates until reaching 67Pa for high vacuum degassing (15-20 minute treatment). Process concludes with vacuum main valve closure, vacuum break, lid lifting, final measurements, cover car return to standby, argon cessation, and ladle transfer to continuous casting station.
