Development Of Bottom Blowing Argon Ladle Process

Using water modeling method, The fluid and mixing characteristics under the different operating modes in bottom blowing argon ladle process have been investigated. A water model of 1/4 linear scale for 130t ladle has been designed, fabricated and established. The mixing time of molten steel in the ladle has been measured with conductivity method. The influence of the main technological and structural parameters was examined. The fluid flow pattern and flowr field in the ladle were demonstrated, observed and analyzed. By using water model simulation discuss that the different blowing position of single nozzle and bowing quantity of gas influence on the mixing effect, double blowing and different blowing combination impress the mixing effect and the entrapped slag. Comparably analyzes single nozzle blowing and double blowing. At the same time. Numerical simulation has been done, using the commercial code PHOENICS to describe to find the fluid flow changes under each situation, the project finds out the effect technical parameters of blowing argon, which provides the optimum argon blowing operation duty.It may be concluded that under the condition of bottom blowing argon, mixing time shorten with increasing blowing quantity of gas, but a critical argon blowing quantity exists, beyond which the liquid surface fluctuates fiercely and slag entrapped by molten steel happens.Single nozzle blowing and double blowing were compared under same blowing quantity of gas. Double blowing has better mixing effect. Through the experiment, we can found it is helpful to shorten mixing time and reducing chances that swirl entrapped slag happened by increase two nozzles' distance. But to avoid shear entrapped slag, it is not good that the nozzle is too near to the ladle body. Physical modeling experiments demonstrate that the optimal position of two nozzles which are 180° symmetrical distribution is 0.6i?~0.65R away from the centerline of the ladle and argon blowing quantity which is over 50m~/h is not suitable in practical production.