Automatic steel ladle nitrogen adding device and automatic steel ladle nitrogen adding method

Abstract

The invention provides an automatic steel ladle nitrogen adding device and an automatic steel ladle nitrogen adding method. On the basis of an original bottom-blowing argon system, a nitrogen source, a nitrogen stabilizing bag, a main nitrogen pressure gauge, a switching valve, a managing computer, a procedure computer, a PLC (programmable logic controller) and relative pipelines are added. When nitrogenous steel is produced, the PLC controls the switching valve according to a target nitrogen value provided by the procedure computer, when nitrogen accumulation does not reach the target nitrogen value, the switching valve is turned to a nitrogen open circuit state, when the nitrogen accumulation reaches to the target nitrogen value, the switching valve is turned to an argon open circuit state, and automatic switching between the argon and the nitrogen is realized. The defect of manual nitrogen adding is eliminated, the nitrogen content of thick nitrogenous steel plate blanks is precisely controlled within 0.008-0.015%, and the nitrogen content of thick plate products can be controlled according to the precision 0.01%, steel modifying loss is reduced, and steel grade yield and enterprise economic benefit are increased.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a nitrogen increasing device and method thereof for automatically controlling molten steel in a ladle when the nitrogen-containing steel is smelted in a converter. Background technique [0002] The nitrogen content range of nitrogen-containing steel thick slabs is required to be between 0.008-0.015%, and the target nitrogen content is 0.012%. At present, when domestic steel mills produce thick slabs of nitrogen-containing steels, they generally adopt the method of temporarily changing the bottom blowing argon gas of the converter to manually change the bottom blowing nitrogen gas to increase the nitrogen content of molten steel, and artificially control the nitrogen content. Although the above-mentioned method of increasing nitrogen is relatively simple and requires less control devices, from the perspective of actual production effect, there are proble...

AI Technical Summary

Problems solved by technology

Although the above-mentioned method of increasing nitrogen is relatively simple and requires less control devices, from the perspective of actual production effect, there are problems such as large influence of human factors and inaccurate control of nitrogen increasing amount, which makes the nitrogen content difficult to meet the requirements of nitrogen-containing steel types. , resulting in steel loss

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