Converter steelmaking endpoint determination method and system, control method and control system

Abstract

The embodiment of the invention discloses a converter steelmaking endpoint determination method, which comprises the following steps of: acquiring flame information of flames at a fire hole, and extracting characteristic information from the flame information; and establishing an endpoint prediction model, and forecasting the converter steelmaking endpoint by combining the characteristic information and the endpoint prediction model. The invention also discloses a converter steelmaking endpoint determination system employing the method, a control method and a control system. The control system can analyze the whole change process of molten steel carbon and temperature on line in real time so as to lighten labor intensity of steelmaking workers and ensure the quality of steel and can realize automatic control of a blowing endpoint and improve the automation level of converter steelmaking; and because the converter steelmaking endpoint is determined by flame images and light intensity, the hit rate of the converter smelting endpoint is improved, and the smelting time is shortened by 3 to 4 minutes; therefore, the production efficiency is improved and the cost is reduced.

Description

Technical field [0001] The invention relates to the field of automatic control of steelmaking, and more specifically, to a method and system for judging the end point of steelmaking in a converter, a control method and a control system. Background technique [0002] In the converter steelmaking, the steelmaking endpoint control is one of the key technologies of the converter steelmaking, and the converter steelmaking steel output accounts for more than 80% of the total steel output. In the large and medium-sized key iron and steel enterprises, the converter steel output is dominant. Therefore, improving and improving the production capacity and control level of converter steelmaking has always been paid attention to. Converter steelmaking is a very complex metallurgical reaction process with many influencing factors. In order to realize the automatic control of the converter smelting process, many detection technologies have been developed at home and abroad. The commonly used m...

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Problems solved by technology

[0003] In actual production and theoretical research, it is found that: manual experience controls the end point of steelmaking, which is closely related to the experience and working status of on-site workers. It has low end point hit rate, high splash rate, many times of furnace reversal, poor production stability, etc. Problems: With the static endpoint control system, the hit rate still cannot meet the requirements of automatic steelmaking, and the control process cannot be tracked and corrected in real time; the measurement time of the chemical analysis method is far from meeting the real-time requirements of the smelting process control, and There are splashing accidents during sampling; the secondary gun method has a high hit rate at the end point, but it is expensive. At the same time, the probe is a consumable and cannot continuously obtain blowing information. It has high requirements on the furnace capacity and is generally only suitable for converters above 120t; furnace gas Analytical method (divided into laser and mass spectrometer), laser detection analysis is only effective for endpoint control when the carbon content is very low (<0.05%), mass spectrometer analysis has a high endpoint hit rate, strong process control ability, but expensive, Equipment maintenance is difficult

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