Control method of draught fan for dry dust removal of converter gas

Abstract

The invention provides a control method of a draught fan for dry dust removal of converter gas, which comprises the following steps: in a phase other than converter oxygen blowing, transmitting a rotation speed percentage set value to a draught fan frequency changer in a fume flow control mode; in a converter oxygen blowing phase, setting an oxygen blowing start time; and when the oxygen blowing time exceeds the oxygen blowing start time, using a pressure PID (proportional-integral-derivative) controller and a fume flow PID controller in a cascade control mode combining fume flow control and converter mouth fume hood micro-differential pressure control, wherein the output quantity of the pressure PID controller is used for compensating for the set value of the fume flow PID controller, and the output value of the fume flow PID controller is used for controlling the rotation speed of the draught fan frequency changer. The method enables the draught fan to be in a good working state, ensures the recovery quantity of converter gas and ensures that the draught fan for dry dust removal of converter gas has high dynamic response, high tracking accuracy and favorable stability.

Description

technical field [0001] The invention relates to the field of electrical control in the iron and steel metallurgy industry, in particular to a method for controlling an induced draft fan for converter gas dry dust removal. Background technique [0002] The induced draft fan of the converter gas dry dedusting system is an important equipment of the converter gas recovery system. It is an important facility to turn a large amount of carbon monoxide flue gas produced in the converter smelting process into treasure. The induced draft fan sends the converter gas generated during oxygen blowing to the converter gas holder to ensure the working environment for steelmaking in front of the furnace. The induced draft fan is equipped with frequency conversion speed regulation, which is not only beneficial to the explosion venting of the system, but also can realize flow tracking and adjustment, so as to ensure the quantity and quality of gas recovery and save energy. [0003] The exist...

AI Technical Summary

Problems solved by technology

However, the fluctuation of the flue gas of the converter is large, and the flue gas volume and flue gas composition change with the change of the smelting cycle. Control is difficult to obtain ideal control effect

In recent years, domestic scholars have proposed nonlinear compensation strategies such as sliding mode control, nonlinear PID control, and fuzzy control for the nonlinear characteristics of micro-pressure difference control. Although some effects have been achieved, there are still many problems, such as : There are phenomena such as "steep vibration" and "parasitic tremor" in sliding mode control, and there are contradictions between overshoot and response time in nonlinear PID and fuzzy control

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