Research on Descaling Characteristics and Simulation Calculation of a Coaxial High-Frequency Electronic Descaling Device

Abstract

High-frequency electronic descaling devices are physical water treatment methods that use a high-frequency electromagnetic field to prevent and remove scale. The effectiveness of the method is verified by monitoring the growth of scale on the surface of heat exchange tubes. The microstructure of scale obtained from experiments is analyzed by scanning electron microscope (SEM), and the action characteristics of high-frequency electromagnetic fields on water are explored by observing the change of solution contact angle at different times. The experimental results show that the high-frequency electromagnetic field can slow down the scaling growth on the surface of heat exchange tubes by changing the morphology of scaling substances and the physicochemical properties of water. The cavity of the instrument is modeled and simulated by ANSYS Maxwell, and the three operating parameters, waveform, voltage and frequency, are changed respectively. The performance parameters of the cavity, such as magnetic field energy, electric field energy and magnetic flux, are calculated and compared, and then the more suitable operating parameters are selected to improve the performance of the instrument. The simulation results show that the high-frequency electromagnetic field generated by the anode rod in the axial position can be overlooked compared with the magnetic field energy. Square wave excitation produces greater magnetic field energy than using sine wave excitation, and as the voltage increases, the peak value of the magnetic field energy continues to rise and increases faster. With an increase in the frequency, the peak value of the magnetic field energy and magnetic flux peak will maintain a slight decrease over a certain frequency range. After this frequency range, the peak value of magnetic field energy and magnetic flux peak will decrease rapidly. This decrease is due to the relaxation caused by the change of the waveform direction. The influence of time and an increase in the frequency will significantly increase the influence of the relaxation time.

Research progress of electromagnetic scale inhibition technology for industrial circulating water

“…Dissolving calcium carbonate on both sides of the pipe wall will increase the concentration of carbonate and bicarbonate in the solution, causing hydrolysis reaction with circulating water equation ( 8) and ( 9) , and the generated OHwill increase the PH of the solution. The increase of OHconcentration is shown by equation (13), and the equation moves to the right. Will continue to generate soft texture of calcium carbonate crystals, washed away by the water flow [15].…”

“…In the case of resonance, the hydrogen bond of water molecules will break and form small groups of water molecules or even single water molecules, which will lead to dynamic equilibrium in aqueous solution.The research of Zhe Lv [12] showed that after the experimental solution was treated by electromagnetic, the hydrogen bond between water molecules was strengthened, more water molecular clusters were formed, and the hydration of ions in the solution was also strengthened, so that the water molecules were wrapped around Ca 2+ , resulting in no excessive crystallization of calcium carbonate. Yan [13] explored the effect of high frequency electromagnetic field on water by observing the change of the contact angle of the solution at different times. The experimental results show that the electromagnetic field reduces the contact angle of the solution, thus reducing the surface tension of the liquid and changing the physicochemical properties of the aqueous solution.…”

“…The waveform generated by the signal generator is very important to the effect of electromagnetic scale inhibition. Zhao [13] and Wenbin [28] Jiang's research shows that the force on water molecules varies depending on the output waveform of the signal generator. The energy of the square wave is greater than that of the sine wave, which has the best scale inhibition effect.…”

Automatic Calculation and Simulation of Time-Varying Failure Rate of Digital Relay Protection Device

“…It requires a large amount of memory, and the convergence speed is also insufficient. Although the nonsequential simulation algorithm has been improved, its model establishment is relatively simple, the memory required for the operation is small, and the relative sequential convergence speed is relatively fast, but it still cannot meet the requirements in practical application [13,14].…”

Experimental Study on the Combined Effect of Electromagnetic and Electrochemical Processes on Descaling and Anticorrosion

“…Therefore, adopting effective water treatment methods is crucial to ensure the normal operation and long-term stability of industrial circulating water systems. Researchers have proposed various methods to address these challenges, including physical cleaning, ultrasonic techniques, ion exchange resin methods [1], chemical agents, electrochemical approaches [2], and electromagnetic treatments [3][4][5]. Each method has its unique advantages and limitations.…”