SU407176A1 - METHOD OF REGULATING LIGHTING TEMPERATURE - Google Patents

Description

I

This invention relates to the field of ferrous metallurgy, in particular to electric steel making.

On three-phase arc steel-smelting furnaces, there is a significant non-uniformity of the thermal stress of the walls around the circumference, which leads to non-uniformity of the wall lining, and, opposite to the arcs, maximum wear is observed, and between the arcs, the minimum. In this case, the furnace is stopped for repairs due to wear of the lining areas opposite the arcs with a significant residual thickness, but not the lining of the walls between the arcs. This leads to new refractory costs and a significant amount of electric furnaces.

A known method for controlling the temperature of the lining of the furnace step is due to the installation of water-cooled elements.

However, to drain a known method, the construction of a pumping station is required, the power consumption increases, and the furnace maintenance becomes more complicated.

In order to reduce the tenline irregularity of the wall lining and increase its durability, according to the proposed method, the furnace lining temperature is measured in certain areas and a sigal is given to simultaneously tilt all three electrodes to bring the arcs to the center of the furnace when the maximum thermal stress is exceeded. arc, with a maximum mosh.nost over-minimal, measured at the point of the walls between the arcs, and 1-5%.

The method is determined in the following manner. At the end of the melting period, when the arcs open, and the shielding walls of the solid charge melt, uneven thermal tension of the lining occurs.

step on a circle. The thermal stress of the walls, which is characterized by the value of the falling heat flux, is measured by a thermal probe or heat meter at the point of the walls opposite the arc, which has the maximum power, and

point of the walls between the arcs. The signals from the heat flow sensors reach the reference element, the dead zone of which is in the range of 1-5%. When the deadband of the element is exceeded

a signal is sent to the electrode tilt regulator, and the actuators tilt the electrodes, with the arcs approaching the chain of the furnace. As the arcs approach the center of the wall, the non-uniformity of the thermal nanorosity of the walls decreases, and as the deviation decreases to a value equal to or smaller than the dead zone of the reference element, the slope of the electrodes ceases. In the course of melting the angle of inclination of the electrodes

varies with the properties of the slag and

its quantity, electric mode and melting technology.

The slope of the electrodes can be accomplished by tilting the columns rigidly connected to the electrodes by the electrode holder using an electromechanical pneumatic or hydraulic actuator. The rate of inclination of the electrodes should be at least 30 ° per minute.

The temperature of the inner surface of the lining, measured at the point of the walls opposite the arc having the maximum power, and at the point of the walls between the arcs can also be taken as the initial value of the prn regulation of thermal stress.

The inclination of the electrodes to bring the arcs to the center of the furnace will reduce the uneven thermal stress of the lining of the electric furnace walls. Maintaining the excess of the maximum thermal stress over the minimum at the level of 1-5% allows to ensure almost uniform wear of the wall lining but the circumference and increase its durability.

Subject invention

The method of controlling the temperature of the lining of the furnace walls, including measuring the temperature of the wall laying and the inclination of the electrodes from the vertical axis along the course of melting, characterized in that, in order to reduce thermal

irregularity of the lining of the walls and increase its durability, a signal for the simultaneous tilt of the electrodes and the approach of the arcs to the center of the furnace when the temperature difference between the masonry against the electrodes and between them is 1-5%.