System and method for automatically controlling content of residual oxygen in regenerative heating furnace

Abstract

The invention discloses a system and method for automatically controlling the content of residual oxygen in a regenerative heating furnace and belongs to the technical field of control over combustion of heating furnaces. The system comprises a computer terminal, a programmable controller, a regulating valve, zirconium oxide analysis meters and a heat value analysis meter. A combustion section of the heating furnace comprises a first heating section, a second heating section and a soaking section, the zirconium oxide analysis meters are installed in the middle portions of the tops of all the sections, and the heat value analysis meter is installed in front of an inlet of a gas main. During combustion of the heating furnace, the actual air-fuel ratios are obtained through calculation according to the theoretical air-fuel ratios of the three sections, and optimal control over the content of the residual oxygen in a hearth is achieved by combining the zirconium oxide analysis meters with the heat value analysis meter for control. The system and method for automatically controlling the content of the residual oxygen in the regenerative heating furnace have the advantages that a gas and an air flow control valve is controlled reasonably, accurately and rapidly, the adjustment function of the regulating valve is effectively utilized, optimal control over the content of the residual oxygen in the hearth of the heating furnace is achieved, fuel is saved, and pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of heating furnace combustion control, in particular to an automatic control system and method for the residual oxygen content in a regenerative heating furnace furnace, a method based on a combination of a zirconia analyzer and a calorific value meter to calculate the air-fuel ratio to realize the automatic control of the residual oxygen content in the furnace. Optimal control method for residual oxygen content. Background technique [0002] The heating furnace is an important part of the hot rolling production line, and its control system undertakes the important task of providing the billet with a suitable temperature for the rolling mill. Due to the complexity and hysteresis of the combustion process of the heating furnace and the limitations of the process equipment, at present, the combustion method of the heating furnace mostly adopts the regenerative type, and its automatic combustion control system ...

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Problems solved by technology

This method is suitable for heating conditions with relatively stable calorific value, but in fact, the gas calorific value of iron and steel enterprises fluctuates greatly, which brings great difficulty to the practical application in engineering, and the actual effect is not ideal

Under such conditions, the actual air-fuel ratio required for production should change in real time. At the same time, due to the large hysteresis of the temperature control system, the current method of determining the air-fuel ratio also needs to be improved to a certain extent.

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