PID adjusting method of stable oxygen flow adjusting valve and control system thereof

Abstract

The invention discloses a PID adjusting method of a stable oxygen flow adjusting valve and a control system thereof, and relates to the technical field of oxygen flow control. The method comprises thefollowing steps of: the step 1, setting a fixed opening degree of a regulating valve, and continuously calculating a difference value [Delta]F between a set target value and an actual value; the step2, dividing the difference value [Delta]F between the set target value and the actual value into an interval of more than or equal to 5%, an interval of more than or equal to 4%, an interval of morethan or equal to 3%, an interval of more than or equal to 2%, an interval of more than or equal to 1% and an interval less than 1% according to target requirements, respectively setting proportionality coefficients. The larger the [Delta]F is, and the larger the set proportionality coefficients are, so that the adjusting speed is accelerated; the smaller the [Delta]F is, and the smaller the set proportionality coefficients are, so that the higher the adjusting precision is, and the smaller the fluctuation is; and by means of the adjusting method, a converter with the oxygen supply intensity reaching 39000 cubic meters per hour can reach a target value, so that the adjusting speed is increased, the smaller the [Delta]F is, and the smaller the set proportionality coefficients are, so that the higher the adjusting precision is, and the smaller the fluctuation is. The control target is achieved, and the technological requirements are well met.

Description

technical field [0001] The invention relates to the technical field of oxygen flow control, in particular to a PID adjustment method and a control system for stabilizing an oxygen flow regulating valve. Background technique [0002] Oxygen flow adjustment accuracy requirements for converter steelmaking are very high. The process target accuracy is less than 1%, the peak value is less than 5%, and the adjustment time is less than 5 seconds. During the adjustment process, the pressure changes due to the flow change. Therefore, it is difficult to directly adopt PID adjustment to meet the accuracy requirements of the process target at the same time. This patent discloses a new method for setting PID adjustment parameters, which is used to improve the accuracy of oxygen adjustment. Contents of the invention [0003] The technical problem to be solved by the present invention is a PID adjustment method and its control system for stabilizing an oxygen flow regulating valve to ef...

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Problems solved by technology

[0002] Oxygen flow adjustment accuracy requirements for converter steelmaking are very high. The process target accuracy is less than 1%, the peak value is less than 5%, and the adjustment time is less than 5 seconds. During the adjustment process, the pressure changes due to the flow change. The accuracy of flow adjustment, so it is difficult to directly use PID adjustment to meet the process target accuracy requirements at the same time

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