ЭКСТРЕМАЛЬНО-ОПТИМИЗИРУЮЩЕЕ АВТОМАТИЗИРОВАННОЕ УПРАВЛЕНИЕ НАГРЕВОМ НЕПРЕРЫВНОЛИТЫХ ЗАГОТОВОК В ПЕЧАХ ПРОХОДНОГО ТИПА

Abstract

This article deals with a strategy of advanced extreme-optimal high-output energy-saving uniform exploratory control for the heating of concast slabs under the broad hot-rolling mill working modes with unsteady outputs to achieve guaranteed metal heating. The implemented advanced extreme-optimal exploratory control development strategy for production processes is analyzed using the specific example of efficient guaranteed optimum control of the heating parameters in through-feed furnaces. We review the best variational and exploratory extreme control methods for three interrelated heating processes: the distribution of fuel along the length of the furnace body and over time; the optimal control of fuel-burning to obtain the best calorific effect possible; the optimum heat-saving control for combustion product ejection through the reduced heat losses due to suction and knocking out. The operability and feasibility of the suggested extreme-optimal control are achieved using the simplified dynamic heat exchange model along the “fuel consumption” - “billet center temperature” channel with the surface temperature of the heated billets used as the main monitoring and control parameter. We analyzed the efficient method of automated autonomous positive control for the real thermal condition of each of the billets before they are ejected from the furnace to prevent the possibility of feeding underheated billets to the rolling mill, as well as emergencies in the mill. This system provides a forecast for the expected breakdown temperature for each of the billets before they are ejected from the furnace under the energy-saving operational mode. We present the results of the practical implementation of the extreme-optimal control for metal heating at four Russian high-output rolling mills that have a significant economic effect with minimum costs of software (digital) implementation of the suggested control concept.