Method for determining furnace-temperature set value of billet heating furnace

A method for determining a furnace-temperature set value of a billet heating furnace is disclosed and used to determine the furnace-temperature set value of the heating furnace. The method comprises the following steps: S1, predicting a difference between a current control segment outlet temperature and a theoretical target temperature according to a billet temperature calculating model, taking the difference as an feedforward input parameter of a PID circuit to obtain a feedforward furnace-temperature correction value; S2, obtaining a difference between a billet discharge detection temperature and a billet discharge target temperature by a temperature measuring apparatus at the back of the furnace, taking the difference combined with feedback coefficients of each furnace segments as an feedback input parameter of the PID circuit, to obtain a feedback furnace-temperature correction value; and S3, according to current furnace temperature of each furnace segments, feedforward/feedback furnace temperature correction values and heating/cooling speeds, determining the furnace-temperature set value T(i, t+ delta t) of each furnace segments. According to the method for determining the furnace-temperature set value of the billet heating furnace, anticipatory control on the billet in the furnace and feedback control on the discharge billet are integrated, and the PID circuit is used to determine the furnace-temperature set value of each control segment, so that the inside temperature of the furnace is accurately controlled, and thus the rolling technological requirements are satisfied and automatic steel sintering is realized.