Cooling Capacity Evaluation and Optimal Casting Process Design of Core-mounted Copper Stave for 20 m2 Oxygen Blasting Furnace Based on Simulation Results
摘要
Operating characteristics and lifetime of blast furnace depend on the cooling capacity of copper stave installed on the furnace wall. An oxygen blasting furnace is a furnace that produces iron by using anthracite and oxygen as a fuel. The structure and operating characteristics of the furnace are different from that of a coke furnace, so the structure and working conditions of the copper stave installed on the furnace wall of the oxygen blasting furnace are also different from that of the coke furnace. To ensure normal operation of the oxygen blasting furnace and increase the furnace lifetime, the structure of the wall copper stave was newly designed, the cooling capacity was evaluated, and the casting process of the wall stave was developed. The cooling capacity of two types of copper staves (A: core, which is manufactured by using Furan resin molding mixture, mounted copper stave, B: copper pipe-mounted copper stave) was evaluated based on the cooling characteristics simulation results by using Ansys 17.2, Fluent 17.2. Based on the simulation results, the optimal structural parameters were determined using the Taguchi method. The external dimension and wall thickness of the core-mounted wall copper stave were determined as 910 mm × 645 mm × 90 mm and 25 mm, respectively. The inlet diameter and length of the cooling water passing region were also determined as ∅ 70 mm and 220 mm, respectively. The casting process to produce sound core-mounted copper stave with 25 mm wall thickness without any shrinkage and gas defects was simulated by using a commercial simulation software, Pro CAST. As the result, the pouring temperature, time and inlet location were set to 1200 °C, 60s and length side, respectively.