Bottom blowing element of combined blown converter and gas supply method

Abstract

The invention relates to the technical field of converter bottom blowing, in particular to a bottom blowing element of a combined blown converter and a gas supply method. The method comprises the following steps: 1) arranging a bottom gun and preparing elements, namely reserving 4-12 blind bricks after a converter is built, wherein the blind bricks are positions where the bottom blowing elements are inserted into the converter; bottom blowing elements of various angle types are prepared, and the included angle is 1-30 degrees; (2) different bottom blowing elements are selected for bottom blowing according to different furnace service conditions; and (3) different bottom blowing elements are selected for bottom blowing according to different furnace body conditions. The bottom blowing device comprises an outer sleeve, a large pipe and a small pipe, the axis of the large pipe and the axis of the small pipe are the same, and the included angle is 1-30 degrees. Bottom blowing gas is supplied into the converter obliquely upwards, so that molten steel in the converter does small-amplitude rotary motion in a molten pool, the dynamic metallurgical effect of the molten steel of the converter can be enhanced and the combined blowing effect can be improved while the energy offset with top blowing oxygen is avoided, a bottom blowing gas supply strategy can be selected according to different production conditions, the production efficiency of the converter is remarkably improved, and the production cost is reduced. The economic and technical indexes of the converter are improved.

Description

technical field [0001] The invention relates to the technical field of converter bottom blowing, in particular to a bottom blowing component and a gas supply method of a double blowing converter. Background technique [0002] Steelmaking converter top-bottom combined blowing is a comprehensive technology that combines the advantages of top-blowing and bottom-blowing converters. It has better metallurgical properties than top-blowing or bottom-blowing, and is widely used in many iron and steel enterprises in the world. Converter top-bottom combined blowing technology can shorten smelting time, reduce FeO in slag, increase metal yield, and make the temperature and composition of molten steel uniform. [0003] Top-bottom combined blowing is currently the mainstream process at home and abroad. How to effectively improve the double blowing effect of the converter is the key to the combined blowing converter smelting technology. The bottom blowing control method and method are the...

AI Technical Summary

Problems solved by technology

[0005] CN201910618455 discloses "a converter bottom blowing gas supply device and its use method" including a furnace body, the top of the furnace body is provided with an oxygen pipe for transporting oxygen, and the bottom of the furnace body is provided with an inert gas pipe for transporting inert gas. The bottom of the furnace body is provided with a gas supply box, the interior of the gas supply box is provided with a mounting plate, and the surface of the mounting plate is provided with through slots distributed in an array, and the bottom ends of each of the through slots are respectively inserted into A delivery pipeline is provided, and a pressure pipeline is respectively inserted at the top of each channel, and the top of the delivery pipeline connects with the bottom end of the heating pipeline. This invention solves the problem that the gas supply device cannot ensure sufficient inert gas delivery As far as the converter is used for steelmaking, which affects the quality of steelmaking, a sufficient amount of inert gas can be introduced into the converter through pressurization, so that the molten steel in the molten pool is stirred more evenly, and the quality of molten steel smelting is significantly improved.

[0006] All the above bottom blowing methods are blowing into the converter vertically to the bottom of the furnace, the dynamic effect is not ideal, the vertical agitation form is easy to offset the energy of the top blowing oxygen, and the converter production will have different furnace operations and furnace body conditions and In the case of steel types, the above technical solutions do not propose a corresponding solution

Images