Industrial circulating water pH automatic control device and control method

Abstract

The invention discloses an industrial circulating water pH automatic control device and a control method. The device comprises a sampling unit, an acid adding unit and a control unit, wherein the sampling unit comprises a circulating water pump and a pH online measuring instrument, and an inlet and an outlet of the circulating water pump communicate with an industrial circulating water tower through pipelines; the pH online measuring instrument is arranged on an outlet pipeline of the circulating water pump; the acid adding unit comprises an acid solution tank and an acid adding pump, an outlet of the acid solution tank communicates with an inlet of the acid adding pump, and an outlet of the acid adding pump communicates with the industrial circulating water tower; and the control unit comprises a touch screen and a PLC, the touch screen is in communication connection with the PLC, and the PLC is electrically connected with the pH online measuring instrument and the acid adding pump. According to the method, the pH of the industrial circulating water can be conveniently and automatically controlled without manual intervention.

Description

technical field [0001] The invention relates to the technical field of acid addition in industrial circulating water, in particular to an automatic pH control device and control method for industrial circulating water. Background technique [0002] At present, the operation and management of most industrial circulating water systems are very extensive. Adding acid to control the pH of circulating water is still manual operation, which is difficult to deal with changes in the field. There is a large lag in the data results, and it is impossible to accurately add acid to control the pH. Extensive and lagging control can easily lead to insufficient or excessive acid addition. Insufficient acid addition will increase the risk of scaling and corrosion in the system, causing scaling and corrosion failures in equipment, which will not only cause economic losses but also make equipment maintenance very difficult; Excessive acidity will not only increase the cost, but also may increa...

AI Technical Summary

Problems solved by technology

[0002] At present, the operation and management of most industrial circulating water systems are very extensive. Adding acid to control the pH of circulating water is still manual operation. It is difficult to deal with changes in the field. There is a large lag in the data results, and it is impossible to accurately add acid to control the pH.

Extensive and lagging control can easily lead to insufficient or excessive acid addition. Insufficient acid addition will increase the risk of scaling and corrosion in the system, causing scaling and corrosion failures in equipment, which will not only cause economic losses but also make equipment maintenance very difficult; Excessive acidity will not only increase the cost, but also may increase the operation risk of the system or exceed the discharge standard

[0003] Due to changes in external conditions such as unit load, atmospheric temperature, and humidity, the pH value of industrial circulating water will be affected. At the same time, the excessive hysteresis of the system itself makes it impossible for operators to accurately control the amount of acid added and increases the labor intensity of employees. Hidden danger

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