A coordinated control method to ensure efficient operation of burners in hot rolling heating furnace

Abstract

The invention relates to a coordinated control method for ensuring high-efficiency operation of a burner in a hot-rolling heating furnace. At the same time, the actual gas flow × air-fuel ratio is used as the set value of the air flow PID regulator to realize the cascade adjustment of the gas flow and the proportional adjustment of the air flow; set the maximum value of the adjustment range of the gas flow PID regulator F Max , the minimum value of the set value F min and when the flow process value is less than the minimum value F min , change it to the minimum value F min ; Transform the output value scale of the furnace temperature PID regulator into a duty ratio ρ as the set value of the burner timing controller; establish the burner timing controller; control the air pulse valve through the output timing signal of the burner timing controller And gas pulse valve to adjust the combustion time of each burner. By adopting the method of the invention, each burner can be ensured to be in the best combustion state, and the working efficiency of the burner can be improved.

Description

technical field [0001] The invention relates to the field of automatic control of hot-rolling heating furnaces, in particular to a coordinated control method for ensuring efficient operation of burners of hot-rolling heating furnaces. Background technique [0002] The hot rolling process of the steel plant needs to uniformly heat the steel billet to the required rolling temperature before the rolling mill can normally roll the steel billet. The hot rolling heating furnace is a device for heating the steel billet. The conventional heating furnace consists of one or more heating sections. Composed of a soaking section, each heating section is generally equipped with multiple heating areas (for example, divided into heating upper left area, left lower area, right upper area, right lower area), and multiple burners are arranged on the furnace wall of each heating area (such as 6 burners), the gas and combustion-supporting air pass through the burner, enter the furnace to mix and...

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Problems solved by technology

[0002] The hot rolling process of the steel plant needs to uniformly heat the steel billet to the required rolling temperature before the rolling mill can normally roll the steel billet. The hot rolling heating furnace is a device for heating the steel billet. The conventional heating furnace consists of one or more heating sections. Composed of a soaking section, each heating section is generally equipped with multiple heating areas (for example, divided into heating upper left area, left lower area, right upper area, right lower area), and multiple burners are arranged on the furnace wall of each heating area (such as 6 burners), the gas and combustion-supporting air pass through the burner, enter the furnace to mix and burn, each heating area is equipped with a set of conventional furnace temperature adjustment system, according to the furnace temperature, gas flow, air flow detection value, through the gas control valve And the air regulating valve controls the coal air flow to control the furnace temperature; the length direction of the steel billet in the heating furnace is consistent with the length direction of the burner flame, and the burner has certain working characteristics. Only under certain coal air flow conditions can the flame of each burner be guaranteed. The length ensures the heating efficiency of the burner; the temperature range of the billet to be heated is generally from room temperature to about 800°C, so there are hot delivery or cold loading of the billet into the furnace, and the rolling rhythm of the rolling mill may also change due to various reasons. These factors will cause large fluctuations in the heat supply in the furnace. In order to ensure the furnace temperature, the heating intensity (gas flow) of each heating zone of the heating furnace has a large change. If the gas flow is too small, the flame of each burner will be too short. The heating efficiency of the burner is greatly reduced, which affects the uniformity of heating in the length direction of the billet and wastes energy. Therefore, the heating furnace now adds a solenoid valve in front of each air gas burner in some heating areas, which can control the number of burners working. and combustion time (called pulse burner), when the combustion intensity is relatively low, several burners are closed manually in order to improve the working efficiency of the burner. The corresponding relationship between the number of burners, so the actual effect is not ideal

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