Abstract
The authors have analyzed the existing approaches to solve a problem of determining the moment of slag outcome beginning during steel casting from a ladle to a tundish. The solution of this problem is considered in two aspects: the first is the choice of best way to generate a diagnostic signal from the position of the price/quality ratio of its handling, and the second is the development of a method to process this signal in order to obtain useful information. A scheme is proposed to receive a signal of vibration acceleration from a sensor installed on a manipulator of the ladle protective tube. A product sample is developed to arrange that. It provides protection from the influence of industrial disturbances on the sensor. In order to analyze the vibration acceleration signal, the criteria to determine the moment of the slag outcome beginning were determined based on entropy energy calculation. This method and a system developed on its basis are tested under industrial conditions for a real object. The only condition for effective operation of the developed criteria is selection of the subsystem of steel level maintenance at final casting step to the manual mode to eliminate the disturbances from the movement of the slide shutter used to control the flow of liquid steel. According to the results of experiments under real conditions, it was found that the slide shutter control shutdown is to be performed if weight of the ladle content is from 18 to 19 tons approximately. In this mode of operation, the operator has always been able to found such a rate of steel discharge that the level of steel in the tundish is within the technological requirements. As a result, it is possible to ensure the proposed algorithm triggering for each casting earlier than the operator stops the process manually. At the same time, the amount of steel with slag left in ladle does not exceed 3.8 tons comparing to the moment of the slag cut-off made by the operator.
Highlights
The authors have analyzed the existing approaches to solve a problem of determining the moment of slag outcome beginning du ring steel casting from a ladle to a tundish
A scheme is proposed to receive a signal of vibration acceleration from a sensor installed on a manipulator of the ladle protective tube
In order to analyze the vibration acceleration signal, the criteria to determine the moment of the slag outcome beginning were determined based on entropy energy calculation
Summary
Еременко Ю.И., д.т.н., профессор кафедры «Автоматизированные и информационные системы управления». В работе произведен анализ существующих подходов решения задачи определения момента начала истечения шлака при сливе жидкого металла из сталеразливочного ковша в промежуточный. По результатам экспериментов в реальных условиях выявлено, что отключение автоматики необходимо производить при остаточном весе содержимого сталеразливочного ковша порядка 18 – 19 т до окончания разливки. Его суть состоит в том, чтобы обеспечить постоянное наличие металла в ванне промежуточного ковша, достаточного для обеспечения потребностей машины непрерывного литья заготовок. 1. Функциональная схема исследуемой системы: 1 – сталеразливочный ковш; 2 – промежуточный ковш; 3 – шлак; 4 – защитная труба; 5 – шибер сталеразливочного ковша; 6 – шибер промежуточного ковша; 7 – акселерометр; 8 – сталь; 9 – манипулятор. При сливе жидкого металла из сталеразливочного ковша важным процессом, влияющим на качество стали, является предотвращение попадания шлака в промежуточный ковш. Решаемая в работе задача является достаточно актуальной в виду существенных потерь, которые несут металлургические комбинаты при разливке стали на данном технологическом переделе
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