Severstal Improves Heating Efficiency of Mill 5000 Furnaces
The specialists of Severstal Digital, together with the collective of the Severstal Russian Steel division’s flat-rolling shop for the production of tubular products
The specialists of Severstal Digital, together with the collective of the Severstal Russian Steel division’s flat-rolling shop for the production of tubular products located in Kolpino have developed a model for automatic heating control of the chamber furnace No 1 of mill 5000. The technology helps to speed up the heating process of the furnace and reduce the downtime of the unit. In six chamber furnaces, the metal is heated before rolling, at which the temperature rises to 1200 degrees. The heating cycle takes about 18 hours: it includes raising the temperature and holding the metal for some time at these values. At the same time, with an increase in temperature, the required thermal power increases and it is possible to set up to 1050 degrees with greater intensity.
Previously, the operator could only set the final temperature value and the time it takes for the unit to reach it. Over the entire temperature range, the heating rate was approximately 70 degrees per hour. Now the model estimates the current heating rate, gas consumption and temperature difference in the furnace zones and, based on this, sets the optimal heating intensity (for example, in the interval 800-1100 degrees, the temperature rises at a speed of up to 125 degrees per hour). The automatic control mode can be turned on both at the beginning of heating and during the operation of the furnace - the model considers the current state and continues further heating according to the plan.
As a result of using the model, it was possible to reduce the heating time for chamber furnace No. 1 by an average of 10%. In addition, the difference between thermocouples between the zones of chamber furnaces has been reduced to 10 degrees, which allows the most efficient use of energy resources.