Intelligent Control System of BOF Steelmaking
0n the basis of analyzing BOF steelmaking characteristics, a prediction model and control model based on neural network were established. Taking endpoint temperature and endpoint carbon content as control target, oxygen-blown volume and added coolant were calculated, then endpoint control of convert steelmaking was realized. Simulation results show that the simulation result of endpoint temperature and carbon content are satisfying and control strategy is very effective. The application results demonstrate the efficiency of the method.
A Novel Process Control Model for Extracting Vanadium Semi‐Steel in Basic Oxygen Furnace Based on Steelmaking Mechanism
A novel process control model for basic oxygen furnace (BOF) steelmaking is proposed based on metallurgy mechanism, with lower contents of carbon, manganese, silicon, and lower temperature in semi‐steel after extracting vanadium. According to mass balance and heat balance, a static control model is built up, with slagging model, temperature model, and oxygen supply model. When actual amount of oxygen supply reaches 85% of theoretical value calculated by static model, quasi‐dynamic control model is activated to predict carbon and temperature in later period of steelmaking. A steelmaking process control system for semi‐steel smelting on 120 tonne BOF is developed in a steelmaking plant in China. Based on test of three steel grades, this model acts a guide for BOF steelmaking with semi‐steel, not only providing tactic, but also pointing out a feasible method for BOF process control without sub‐lance or off‐gas analyzer.
Increase of the resistivity of electroless-deposited high-B/sub s/ CoNiFeB thin films
In order to increase the resistivity of electroless-deposited high-B/sub s/ CoNiFeB thin films, it was decided to investigate the effect of adding a /spl beta/-alanine containing complexing agent to the plating bath. The resistivity (/spl rho/) gradually increased as the /spl beta/-alanine concentration was increased. CoNiFeB thin films with desirable soft magnetic properties, B/sub s/ = 17-17.5 kG and H/sub c/ < 3.0 Oe, were obtained under these conditions with /spl rho/ value (70-90 /spl mu//spl Omega/ cm) dependent on carbon incorporation in the films. It has been suggested that carbon impurities in the films resulting from the use of the /spl beta/-alanine complexing agent containing -NH/sub 2/ group causes electron scattering, leading to an increase in the resistivity.