Steel rolling heating furnace and dynamic control method for asymmetric characteristics of flue gas pipe network thereof

Abstract

The invention discloses a steel rolling heating furnace and a dynamic control method for asymmetric characteristics of a flue gas pipe network thereof, and belongs to a steel rolling heating furnace control technology. An asymmetric system theory of the steel rolling heating furnace is determined according to the operating condition characteristics of the steel rolling heating furnace and the physical characteristics of the flue gas pipe network; an external air inlet amount calculation mathematical model and an air excess coefficient calculation mathematical model of the steel rolling heatingfurnace are researched and developed; the external air inlet amount of the steel rolling heating furnace is calculated through the argon content detected by flue gas analysis; then the opening of aninlet valve of an induced draft fan is adjusted according to the difference between a set value and a calculated value of the external air inlet amount of the steel rolling heating furnace, so that the external air inlet amount is always controlled within a set value range; the air flow and the gas flow are adjusted according to the oxygen content and the carbon monoxide content detected by the flue gas analysis, so that the air excess coefficient is always controlled within the set value range; and multiple energy-saving and emission-reducing effects of improving the combustion efficiency ofthe heating furnace, reducing the NOx pollution emission and realizing full-automatic control are achieved.

Description

technical field [0001] The invention belongs to the control technology of a steel rolling heating furnace, in particular to the external air intake control technology and the air excess coefficient control technology of the steel rolling heating furnace; the invention does not involve the selection of control systems, control equipment and instruments. Background technique [0002] At present, most of the oxygen content in the domestic steel rolling heating furnace ranges from 2% to 3%, and the fluctuation is relatively large. The resulting oxidation burning loss is about 0.8% to 1.5%, and some are even higher. It has become a steel rolling production enterprise. The main part of economic loss; excessive oxygen content means that the excess air coefficient is too large, which will reduce the thermal efficiency of the heating furnace; at the same time, there are other harms if the excess air coefficient is too large, such as the nitrogen in the excess air generates nitrogen ox...

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Problems solved by technology

[0005] There are no published publications, documents or materials on the dynamic control method of the asymmetric characteristics of the steel rolling heating furnace and its flue gas pipe network

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