Furnace temperature control method and control equipment for open fire heating furnace

Abstract

The invention discloses a furnace temperature control method for an open fire heating furnace, comprising the steps of monitoring the furnace temperature to obtain a furnace temperature feedback value; calculating the difference of a furnace temperature setting value and a furnace temperature feedback value according to the furnace temperature feedback value and the furnace temperature setting value as a deviation value DV1; calculating the difference of the furnace temperature setting value and the furnace temperature feedback value in a unit time, namely, the rake ratio of a furnace temperature change value is used as a deviation value DV2; obtaining the speed V of an open fire heating furnace unit from a speed regulator of the open fire heating furnace unit and obtaining a first multi-feed-forward output component FFV according to the unit speed V; obtaining a second multi-feed-forward output component FFT according to the difference of the furnace temperature setting value and the furnace temperature feedback value as a deviation value DV1; searching a PID (proportion integration differentiation) control parameter based on a fuzzy control rule according to the deviation value DV1 and the deviation value DV2 and generating a modulating control parameter OP1 according to the PID control parameter; making the finally control output value by combining the modulating control parameter OP1 with the first multi-feed-forward output component FFV and the second multi-feed-forward output component FFT to control a gas flow rate adjusting valve and an air flow rate adjusting valve.

Description

[0001] technical field [0002] The invention relates to the field of smelting equipment, in particular to a furnace temperature control method and control equipment for an open flame heating furnace. [0003] Background technique [0004] The continuous annealing horizontal furnace is a relatively common heating furnace. The furnace is divided into several zones along the direction of strip steel travel, and the furnace temperature is controlled by zone. The accuracy of furnace temperature measurement seriously affects the quality and performance of products. For product performance, the accuracy of furnace temperature is very important. The decrease of furnace temperature accuracy will directly lead to unqualified product performance. The general temperature control system is designed with a large power of the burner, resulting in a large thermal lag and thermal inertia during temperature adjustment, which makes the furnace temperature curve oscillate with equal amplitude...

AI Technical Summary

Problems solved by technology

If you pursue fast response, the transition time will be shortened, but the overshoot will become larger, making it difficult to stabilize the furnace temperature; if you pursue stability, although the accuracy of the steady-state furnace temperature is good, the transition time of the furnace temperature will inevitably be very long, making the control fall into a trap. a dilemma

In addition, PID adjustment is a steady-state adjustment method after all, and there is no forward-looking judgment on incoming material conditions and changes in temperature setting values. There are not many adjustment methods for unsteady-state hysteresis situations, and the adjustment effect is not very good. The feedback control compensates the unsteady hysteresis control

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