Automatic secondary reblowing method and system for producing low-carbon steel in converter

Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to an automatic secondary reblowing method and system for producing low-carbon steel in a converter, which comprises the following steps: stabilizing the oxygen flow of an oxygen lance at 90-100% of the set flow, and executing a molten steel heating mode and a molten steel carbon reduction mode; when the rotating speed of the dust removal fan reaches the converter blowing set rotating speed, the oxygen lance descends at the rated rotating speed, and when the oxygen lance descends to the reblowing oxygen opening point, the second oxygen valve is opened; the oxygen lance descends to a reblowing deceleration point, and the descending speed of the oxygen lance is reduced to 25%-30% of the rated rotating speed of the oxygen lance; when the oxygen lance descends to the reblowing point, the oxygen lance stops descending; lifting an oxygen lance, lifting the oxygen lance to an oxygen closing point, closing an oxygen valve II, and automatically lifting the converter smoke hood to an upper limit position; the oxygen lance continues to be lifted to the waiting point, the first oxygen valve is closed, and the dust removal fan runs at a low speed. The method has the advantages that the reblowing time is accurately set, the purpose of adjusting steel grade components and temperature can be achieved through one-time reblowing, the phenomenon of multiple times of reblowing caused by too short reblowing time is reduced, the production efficiency is improved, and the smelting period is shortened.

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