Method for controlling automatic chemical dosing of high-turbidity water system

Abstract

A method for controlling the automatic chemical dosing of a high-turbidity water system trains a back propagation (BP) neural network according to the operation parameters of the flow, turbidity, temperature and pH value of historic source water, the outlet water turbidity of a sedimentation tank and the like, so that a neural network model is obtained, the parameters are then used as the input parameters of the BP neural network, an internal optimization algorithm of the BP neural network is utilized to obtain an output for guiding and controlling the chemical dosing amount, an internal model proportion integration differentiation (PID) algorithm is used to adjust the chemical dosing amount according to the turbidity of the sedimentation outlet water in real time, a flowmeter and a liquid level meter are utilized to accurately control the dosage concentration, the addition flow is calculated according to the dosage concentration and addition dose, PID control is carried out to regulate valve opening or dosing pump frequency according to the flow, and thus, the dosing flow is controlled. According to the method, the dose can be adjusted quickly according to the water source variation, the outlet water turbidity of the sedimentation tank can also be tracked automatically to appropriately correct, thus, the outlet water turbidity index of the sedimentation tank meets technological requirements, and the medicine consumption is also saved.

Description

technical field [0001] The invention relates to an automatic dosing control method in the urban water supply industry. Background technique [0002] The dosing system of the waterworks is an important process in the water production process. The purpose is to make the impurity particles in the water collide and coagulate with the coagulant added, and through electrical neutralization, adsorption bridging and rolling The sweeping action turns the colloid in the water into flocculated particles, which are quickly precipitated through the sedimentation tank. The factors affecting the effect of coagulation and sedimentation are relatively complex, mainly including water temperature, pH value, the nature and concentration of impurities in water, hydraulic conditions, etc. These elements are aspects that need to be considered when designing an automatic dosing system. [0003] At present, the design idea of ​​most automatic dosing systems is based on the ratio of raw water inflow...

AI Technical Summary

Problems solved by technology

Although FCD (Flower Imaging Analysis Feedback Control System), SCD (Flowing Charge Detection Feedback Control System), flow feedforward control and other automatic dosing controls a

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