OPTIMIZATION OF HEATING OPERATION CONTROL IN CHAMBER-TYPE THERMAL FURNACE

Abstract

Using local systems of automatic control of temperature and surplus pressure of heating in the working volume of flaming thermal furnace of chamber type, settings, as a rule, are selected separately without the account of their interconnection. At the same time in control of expense of fuel and air not only temperature but also pressure changes in the working chamber of furnace, that, in turn, is accompanied by change of gaseous exchange with a medium and renders substantial influence temperature in a working chamber. All this is accompanied by substantial excessive consumption of gaseous fuel, and, as a result, by the rise of costs of metal heat treatment. Using heating chart with the constant volume of products of burning in the furnaces of such type, the control of its heat power is in combining charges of different components of gaseous fuel at condition of providing of the given temperature in the working volume. According to the principle of Bellman dynamic programming, optimization of control for the cycle of metal heat treatment was provided by choice of the applied fuel which is optimal on a cost composition for every period of quantum. The present cost of fuel serves as the linear function of middle charges of its separate components in periods of quantum and finding of its minimum value for every discrete moment of time, presented as a decision of task of the linear programming. The determination algorithm for optimal values of charges of gaseous fuel separate components was worked out, as well as for the expense of surplus air, used as controlling influences for the automatic systems of adjusting of temperature and surplus pressure of heating medium in the working volume of furnaces. The functional cart of automatic control system is provided, which implementation allows not only optimization of heating technology by cost of separate fuel components, but also provision of the control autonomy of temperature and surplus pressure of heating medium in the working chamber of furnaces of chamber type by means of self-adjustment. In real-time control process is executed with optimization of cost of separate components of fuel self-adjustment of the system.