METHOD TO CONTROL METAL HEATING IN FLAME HEATING FURNACE Russian patent published in 1996 - IPC

FIELD: method is used in different types of thermal treatment and in heating process before rolling. SUBSTANCE: fuel consumption is controlled by defining fuel consumption parameter, that is changing in accordance with preliminary determined schedule. Value of the parameter is changed in process realization first in cyclical way - from big value to smaller one cycle by cycle and then, correcting value of last cycle figure by summing it up with running value of adjusting action signal, formed by mismatch between running value of temperature and required value of temperature. Time intervals, that determine duration of cycles, are fixed as running values of temperature mismatch achieve given values in field of negative disbalance. In the case they determine controlled figure of excess over required value of temperature and as it is achieved, they use value corresponding to minimum possible fuel consumption in process as constant component of the summed signal. As a result of it optimum mode of temperature rising speed and smooth transferring mode with guaranteed limitation of excursion of temperature by determined limit are provided. EFFECT: improved process. 3 dwg