Water Simulation Study Of Mold At Chonggang 2# Slab Continuous Caster

The core technology of slab continuous casting is mold. The flow field of liquid steel in the mold is very complicated. Many studies of slab continuous casting by means of water simulation have been carried out in domestic and abroad. Physical simulation means building physical model and using necessary testing method to study the specific system process via observation and display. The physical model is based on the principle of the theory of simulation. It should have the same work rule both the experiment and industry condition. The similarity includes geometric similarity, kinematic similarity and dynamic similarity. The dynamic similarity and geometric similarity are the basic terms at studying fluid. The fluid flow is affected by inertia force, gravity force, viscosity force and interfacial force. The main criterions including these forces are Reynolds criterion, Froude criterion and Weber criterion. It is should guarantee the Weber criterion number is the sameness in the liquid steel physical simulation experiment. The liquid steel physic simulation usually is water simulation. In this paper, the 2# slab CCM mold(section is 170×1400mm2) of Chonggang is studied by water simulation. The liquid steel is simulated by water, the slag is simulated by plastic particle and oil. The argon is simulated by nitrogen, the relatively flow parameters are determinate by simulation principal and objects physical characteristics. The main nozzle factors affected the flow field in mold and casting blank quality are shape and inclination angle etc.. Nine orthogonal experiment schemes are designed according to the main factors. The factors are sequenced by the experiments influence. Two optimized nozzles are designed by the experiments result. Finally the optimized nozzle is discovered by means of repeated experiments. In these experiments, the ultrasonic water level sensor is used to collect the level fluctuation,the pressure sensor is used to record the pressure, the adjustable flowmeter is used to control the flow, the stopper rod is used to control the fluid level in mold. Fluid level fluctuations and impact pressure are recorded in the experiments process, at the same time, the slag activity is observed. The optimization nozzles, namely No.10 and No.11 are deduced according to analyze the experiment data. The optimized nozzles and the other two nozzles which performed preferably in experiment are selected to repeat experiment process in the modify conditions to gain the data of level fluctuation, impact pressure and slag activity. Compared the No. 5 nozzle which is used in Chonggang now and No. 11 nozzle flow visualization and slag activity in the condition of varied pulling rate, inserting depth, and air quantity, it is found that the No.11 nozzle is the best to fit for the Chonggang2# mold. According to the experiments, it is found that the optimal casting speed, inserting depth and air blowing quantity are following. (1)The optimal casting speed range is 1.2m/min～1.6m/min. (2) The optimal inserting depth is 230～270mm in the condition that the casting speed is less than 1.4m/min. The optimal inserting depth is 270～290mm in the condition that the casting speed is 1.4m/min. The optimal inserting depth is 290 ～320mm in the condition that the casting speed is greater than 1.4m/min.(3)The optimal air blowing quantity is 6.608L/min when the inserting depth is 250mm, and 11.328L/min when the inserting depth is 310mm.