Anti-interference control method and anti-interference control system in chlorine dosing process

Abstract

The invention discloses an anti-interference control method and an anti-interference control system in a chlorine dosing process, for controlling content of residual chlorine in product water. The content of the residual chlorine in the product water is obtained by a residual chlorine analyzer, and is transferred to an upper computer through a PLC (Programmable Logic Controller), the upper computer computes to obtain a controlled quantity, and the chlorine dosing process is realized by controlling a chlorinator through the PLC. The control method adopts a control method of combining a feedforward controller consisting of a disturbance observer with a feedback controller consisting of a conventional PID (Packet Identifier), and chlorine dosage of the chlorinator at the next moment is determined by output of the disturbance observer and the output of a PID controller together. According to the anti-interference control method and the anti-interference control system disclosed by the invention, the disturbance observer is used to effectively estimate external disturbances such as raw water flow fluctuation, raw water quality change and the like as well as internal disturbances such as model parameter mismatch and the like, so that the content of the residual chlorine in the product water can also be controlled in a better manner in an environment with big external disturbances, and therefore not only can reproduction of microorganisms be inhibited but also health of human beings will not be affected.

Description

technical field [0001] The invention relates to an anti-disturbance control method for chlorine gas dosing process in water treatment, in particular to a control method for reducing disturbance influence by using a disturbance observer. Background technique [0002] As far as the tap water disinfection process is concerned, the conventional process of tap water in cities and towns in my country usually adopts chlorine disinfection, which is used to kill algae, bacteria, viruses and other microorganisms in the water body. Commonly used chlorine disinfectants include liquid chlorine, chlorine dioxide, chloramine, bleaching powder, etc. Among them, liquid chlorine disinfection is relatively cheap, simple and easy to operate, and has low requirements for equipment, so it is the most widely used. During liquid chlorine disinfection, the total chlorine in the water body can be divided into two parts, one is the chlorine consumed by the chemical reaction with substances in the wate...

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Problems solved by technology

[0004] Purpose of the invention: In the face of external disturbances such as large changes in raw water flow and raw water quality, as well as changes in internal working conditions and nonlinearity of chlorinators, the existing control methods make the PID control algorithm widely used in industrial control unable to adapt well , and the problem that the amount of residual chlorine in the factory water cannot be well controlled, the present invention proposes an anti-interference control method and system for the chlorine gas dosing process, using a disturbance observer to improve the ability to suppress disturbances

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