Basic oxygen furnace – To prevent furnace bottom rising measures
Reduce or avoid stagnant zone
1.Increase the impact force
After every repair furnace, The molten bath will radius to reduce. In addition, The liquid metal will correspond to the rising. If make molten bath liquid metal intensive mixing, Must increase jet impact depth. Similarly, Make molten bath bottom liquid metal participate in circulation. Not viscosity the furnace bottom. So, We can adopt to increase the Mach number method to solve
2.Change to nozzle angle style
Use three-hole or four-hole Walrasian Equilibrium Oxygen lance, Due to every hole included angle unreasonable. In the molten bath, The Bottom center has a stagnant zone. In the stagnant zone, liquid metal already not participate circulation. Reducing the stagnant zone, So, We can adopt reduce the nozzle included angle to solve.
Keep reasonable furnace construction
Maintain furnace lining not just to prevent furnace lining working layer corrosion, In addition, Need after repair furnace. Make In the Furnace chamber keep to reasonable construction.
Keep the furnace lining reasonable, Should to reasonably arrange Repair furnace time/Repair the Amount of furnace slag/Repair furnace brick packing way.
But, Optimal furnace maintains, Should pass slag splashing and spray repair combination together. Guarantee slag splashing effect, Is furnace lining maintains premise. So, Requested improve furnace slag construction. Make furnace slag physical properties/components conform to slag splashing protect the furnace require. In addition, Combine gunning Technology， Reasonable maintain furnace lining. Reduce repair furnace times. Make molten bath volume immovable. Make In the molten bath liquid metal well participate circulation. Shrink the stagnant zone, Reduce steel-slag stickup furnace bottom.
Guarantee furnace slag mobility
In the blowing process, Adjust furnace slag structure. Guarantee furnace slag Physical properties/ingredient, Avail to blowing and not corrosion furnace lining and conform to slag splashing protect the furnace require. If furnace slag basicity overtop, magnesia content exceeds the value, After the output steel, Furnace chamber temperature reduction, Have Magnesium oxide crystal precipitated. High melting points mineral C2S、C3S meanwhile precipitated. Make it combine, Cause rising.
In addition, Standardized Operation
1）The lance position control.
The Jet impact depth not only relates to the Oxygen lance nozzle head parameter. Also with the Oxygen lance nozzle head distance liquid metal high-low relate.
Jet impact depth computational formula: H=R(Ar)a·Dh=De+B·h
Among H——Jet impact depth,
R、B——coefficient, Ar——Archimedes number,
Dh–When The Oxygen lance height is H, The oxygen fluid jet diameter.
De–Nozzle head exit diameter, h–Nozzle head height from liquid metal
It can be seen from the above formula.
When the nozzle head parameter fixed, Nozzle head distance to Liquidmetal, The lower the height, Oxygen fluid jet to molten bath impact kinetic energy more bigger.
When the Molten bath mixing more and more strong, For furnace bottom, Jet impact more and more strong, And The furnace bottom corrosion severity.
2) The appropriate Return-slag amount
3) Measure often furnace bottom and lance position