The Mechanism And Experiment Research On Winding Pulse Electromagnetic Field Anti-fouling

Due to continuous loss of water,concentration and many other reasons,scale will appear in the heat transfer equipment and tubes in the circulating cooling water cycle process,resulting in low heat transfer efficiency and even lead to accidents.There are some disadvantages in the traditional chemical methods of anti-fouling,such as secondary pollution,high costs and so on.And the physical method of anti-fouling becomes a trend.One of methods is the winding pulse electromagnetic field anti-fouling(WPEAF)technology,which has received great attention because of its advantages of easy operation,low costs,quick effectiveness,etc.The process of scale formation and its influencing factors are analyzed based on the formation mechanism of scale.And the anti-fouling mechanism of the WPEAF technology is discussed.The effect of pipe material on the distribution of electromagnetic fields in the pipe is simulated using ANSYS.Non-metallic non-magnetic materials such as PVC should be used as the optimal water pipe for the treatment of the WPEAF technology.The influence of diameter and winding number on the distribution of electromagnetic field in the tube are compared.The simulation results show that the performance of the WPEAF system can achieve greater power consumption ratio by using 50 turn coil and 110 mm in diameter.These parameters provide technical guidance for the WPEAF technology to enable it to be efficient used in practical engineering.Aiming at the calculation model of electromagnetic field intensity in the coil of the WPEAF,the necessity of establishing current calculation model in excitation coil is clarified.The WPEAF system is used as the research object.Based on the equivalent circuit of the excitation coil,the mathematical model of the current in the excitation coil with series resistance is established.The equation of the equivalent resistance and the equivalent inductance in the excitation coil with the frequency are fitted using the experimental data.So that the calculation model of the current in the excitation coil is obtained.Finally,the electromagnetic field intensity model in the coil of the WPEAF is obtained.The correctness and accuracy of the current calculation model in the excitation coil are verified by two sets of experiments.The experimental platform of the WPEAF treatment system for circulating water is established based on the mechanism of electromagnetic field anti-fouling technology.The anti-fouling mechanism of the WPEAF technology is further explored through experiment.The experimental results show that under the experimental conditions,the anti-fouling efficiency of the WPEAF technology is the most significant when the frequency of the pulsed electromagnetic field is 1 kHz.Comparing the experimental group and the control group,the results show that the amount of calcium carbonate is increased about 0.8 times,and the crystallization rate of calcium carbonate is increased about 2.4 times after 4 hours of 1 kHz electromagnetic field treatment.The solubility of calcium carbonate in water is increased about 3 times after 8 hours treatment...