Method for predicting casting powder consumption of vibration crystallizer

Abstract

The invention discloses a method for predicting casting powder consumption of a vibration crystallizer, and belongs to the field of ferrous metallurgy continuous casting process calculation. The method comprises the steps that casting powder for testing is firstly injected into a casting powder channel of a vibration crystallizer simulation test device to enable the casting powder channel to be full of the casting powder, the vibration crystallizer simulation test device is started to work according to set vibration parameters, then the pressure value of each pressure testing hole in the face of a vibration plate of the vibration crystallizer simulation test device is collected, the powder channel pressure, corresponding to each time point, of the face of the vibration plate is obtained, and finally the casting powder consumption of the vibration crystallizer within a vibration period is predicted. According to the method, the transverse pressure change of the powder channel is applied to prediction calculation of the casting powder consumption for the first time, the obtained casting powder consumption is made to be more precise, and is matched with the casting powder consumption in actual production, the guiding significance in field production is achieved, and a new idea is provided for analyzing the casting powder consumption.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgical continuous casting process calculation, and in particular relates to a method for predicting mold slag consumption of a vibrating crystallizer. Background technique [0002] During the continuous casting process, with the reciprocating vibration of the mold, the liquid mold slag formed on the surface of the molten steel is sucked into the air gap between the mold wall and the slab shell, forming a solid slag film near the mold wall and a liquid mold slag near the slab shell. Slag film; the slag film controls the heat transfer between the crystallizer and the slab shell, affecting the uniform growth of the slab shell, and at the same time, the liquid slag film also acts as a lubricant; the lubrication state of the slab is measured by the consumption of mold slag. Less consumption of slag will lead to thinner slag film formed, increase friction, increase the possibility of slab cracks, sl...

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Problems solved by technology

[0003] The existing methods for calculating mold slag consumption include: (1) According to the empirical formula obtained from the production site: Q=0.44×exp(-0.44R), where Q represents the consumption of mold slag, and the unit is kg m -2 , R represents the ratio of surface area to volume; (2) Solve the mold slag consumption by combining the Navier-Stokes equation and the mass conservation continuity equation; the empirical formula of method (1) only gives the mold slag consumption The relationship with the size of the cast slab does not give the relationship with variables such as vibration parameters, which has little guiding significance; the calculation of the consumption of mold flux in method (2) only considers the pressure change in the longitudinal direction (that is, parallel to the casting direction), However, the change of pressure in the lateral direction (that is, vertical to the billet drawing direction) is ignored, and the lateral pressure of the slag tunnel is regarded as a constant value for calculation. The consumption of mold powder calculated by this method is still not accurate enough; therefore, the existing calculation of mold powder consumption The method cannot accurately predict the consumption of mold powder, and it still has its shortcomings

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