Statistical Analysis of Circulating Water Quality Parameters under Variable-Frequency Vertical Electromagnetic Fields

Abstract

No unified electromagnetic anti-fouling mechanism is currently available. Most research has focused on the effects of structural parameters and water quality parameters on electromagnetic fields; variations in water quality parameters under the influence of electromagnetic fields have not been reported. A variable-frequency vertical electromagnetic field is proposed in this study. Relationships between conductivity, pH value, dissolved oxygen, turbidity, fouling resistance, and magnetic acting time were carefully analyzed using statistical analysis. Results show that the conductivity difference was the most explanatory predictive variable on magnetic acting time in the multiple stepwise regression model. Magnetic acting time has a greater impact on conductivity than pH value and dissolved oxygen. Conductivity is used as an adaptive feedback control parameter for the optimum anti-fouling state. Fouling resistance on the heat-exchanging surface of the magnetic experiment was smaller than that of the contrast experiment. The anti-fouling efficiency in 1 kHz and 5 kHz magnetic and contrast experiments was 91.23% and 46.97%, respectively. Better anti-fouling performance was realized under the influence of low-frequency electromagnetic fields, confirming that physical water treatment is an effective and environmentally friendly method to eliminate heat exchanger fouling. This research serves as a reference for the development of an electromagnetic-adaptive closed-loop water treatment device.

Study on the Flow State of Circulating Cooling Water for the Industrial Heat Exchange Tube in the Electromagnetic Anti-Fouling Process

“…The principle of water treatment technology and anti-fouling effect of online monitoring evaluation experiment is displayed in Figure . An experimental platform with magnetic and contrast treatments is proposed, and the flow states of circulating cooling water and characteristics of fouling resistance are studied with the same heat exchange condition. ,, Additionally, due to the influence of the electromagnetic field, the formation of coarse particulate fouling is inhibited.…”

“…Based on the variation of water quality parameters (conductivity, pH value, dissolved oxygen, turbidity) under the influence of the frequency conversion electromagnetic field, the relationship between conductivity, pH value, and magnetic acting time was analyzed by using the correlative degree analysis, balanced adjacent degree method . Then, the relationship between conductivity, pH value, dissolved oxygen, turbidity, and magnetic acting time was analyzed by using SPSS statistical methods …”

“…Variations in the flow state of circulating cooling water reflect the formation process of fouling from different aspects. Based on an experimental platform with structure principle of a parallel electromagnetic field, , we study the velocity field and pressure field at various points in the process of circulating cooling water flowing through the heat exchange tube combined with Fluent dynamic analysis. , The experimental data of fouling resistance on the heat exchange surfaces in 0.5, 0.75, 1, and 1.5 kHz magnetic and contrast experiments are carefully analyzed by Origin. Dynamic analysis is employed to indicate the significance of the flow state of circulating cooling water in the fouling formation process .…”

“…17 Then, the relationship between conductivity, pH value, dissolved oxygen, turbidity, and magnetic acting time was analyzed by using SPSS statistical methods. 18 This paper focuses on the dynamic simulation results of the velocity field and pressure field of circulating cooling water on calcium carbonate fouling formation in industrial heat exchanger tubes with a straight shape and U-shaped ones under the action of 0.5, 0.75, 1, and 1.5 kHz electromagnetic fields by using Fluent software. Variations in the flow state of circulating cooling water reflect the formation process of fouling from different aspects.…”