Movable automatic dosing device and control method thereof

Abstract

A detection assembly, a chemical dosing pump, a chemical box, a liquid inlet pipeline, a liquid return pipeline, a chemical dosing pipeline and a PLC control assembly in electric control connection with the chemical dosing pump and the detection assembly are integrated in the movable automatic chemical dosing device. Two ends of the dosing pump are respectively connected with the agent box and the dosing pipeline, and the dosing pipeline is communicated with the membrane unit so as to realize dosing of the agent into the membrane unit; the two ends of the detection assembly are connected with the liquid inlet pipeline and the liquid return pipeline respectively, the liquid inlet pipeline and the liquid return pipeline are both communicated with the membrane unit, the detection assembly is used for detecting the pH value of a cleaning solution in the membrane unit in real time and transmitting a numerical signal to the PLC control assembly, and the PLC control assembly is used for controlling starting and stopping of the dosing pump so as to achieve automatic dosing. The invention further discloses a control method of the device. The device has the advantages of being compact in structure, easy to operate, high in automation degree and the like, the concentration of the cleaning solution is monitored in real time, chemicals are automatically added, and the concentration of the cleaning solution is controlled within a preset range all the time.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a mobile automatic dosing device and a control method thereof. Background technique [0002] Various membrane integrated units for sewage treatment mainly include ultrafiltration integrated units, nanofiltration integrated units, reverse osmosis integrated units and DTRO integrated units. The integrated units need periodic chemical cleaning to clean the unit membrane during production and operation. Components are maintained. Each integrated unit is designed with a cleaning tank. During the chemical cleaning process, cleaning agents need to be added manually. Because contact with the medicament will have certain harm to the human body, it has brought a greater safety hazard to the operator. At the same time, the dosage of artificial dosing cannot be synchronized with the real-time situation of the cleaning solution of the unit in time, it is difficult to ac...

AI Technical Summary

Problems solved by technology

During the cleaning process of the membrane unit, the cleaning solution is manually sampled and tested, and then the ratio is adjusted to realize the adjustment of the dosage. This dosage method has the disadvantages of slow preparation of the cleaning solution and low precision of the solution ratio.

At the same time, there is a certain consumption of active ingredients in the cleaning solution during the cleaning process. This is a dynamic process that requires constant replenishment of chemicals to ensure the precise proportioning of the cleaning solution.

However, the method of adding medicine after manual detection cannot effectively solve this problem.

[0006] (2) The chemical dosing pump in the prior art is installed in a fixed position, and a long pipeline is required for connection between the chemical pump and the membrane unit

Regardless of whether a group of chemical pumps corresponds to one membrane unit or a group of chemical pumps corresponds to multiple membrane units, in a large-scale membrane unit processing workshop, the failure rate of the connecting pipes installed in it is high, resulting in heavy maintenance tasks and the cost of chemicals. Drips are also likely to cause personal safety accidents and environmental accidents, which is not conducive to improving the cleaning efficiency of the membrane unit

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