Pulse-combustion type feed-forward optimal control method for fuel gas and combustion-supporting gas pressure

Abstract

The invention provides a pulse-combustion type feed-forward optimal control method for fuel gas and combustion-supporting gas pressure. The method includes the steps that step A, two control signals are obtained, wherein the first control signal is processed to be a digital signal by polynomial calculation through a PID adjustor to serve as a feedback variable source signal, and the second control signal serves as a feed-forward signal after temperature compensation is performed on the percentage of the accumulatively added fuel gas or the combustion-supporting gas, accounting for the total flow, of a combustion nozzle in an open state; step B, the first control signal and the second control signal are added to obtain a feed-forward optimal control signal. Fuel consumption is reduced, oxidation burning losses of a casting blank are reduced, the utilization rate of fuel is increased, heating quality of the casting blank is improved, and uniformity of heating temperature is improved. The unit consumption of coal gas of a large-scale plate blank heating furnace is reduced to 1.06GJ / t. The temperature difference between the upper surface and the lower surface of a plate blank out of the furnace is smaller than or equal to 10 DEG C. The temperature difference between the middle and the two ends in the length direction of the casting blank is smaller than or equal to 20 DEG C, and therefore the heating quality of the casting blank is stable and reliable.

Description

technical field [0001] The invention relates to the technical field of metallurgical control technology, in particular to a technology for controlling the combustion of cast slabs heated by a large-scale steel rolling heating furnace, and in particular to a pulse-combustion gas and a pressure feed-forward optimization control method for assisted gas. Background technique [0002] Generally, the pressure control of steel rolling heating furnace gas and auxiliary gas pressure is controlled by a traditional proportional integral differential regulator (PID regulator), which is a classic feedback control method. That is, the pressure transmitter detects the pressure of gas and assisted gas, and then converts the pressure detection value into a current signal, which is sent to the PID regulator, where it is compared with the set value of gas and assisted gas pressure, and according to the comparison The obtained difference, the PID regulator gives the signal corresponding to the ...

AI Technical Summary

Problems solved by technology

However, the traditional pure feedback control has a large hysteresis, which makes the gas and auxiliary gas pressure detection values ​​fluctuate greatly, and the air-fuel ratio of the heating furnace is out of balance, which affects the combustion effect of the heating furnace

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