Electromagnetic Field Analysis And Experimental Research On High Frequency Electromagnetic Water Treatment

The circulating cooling water system was widely used in electricity, petroleum,steel and other industrial fields, while fouling greatly reduced the performance of thecirculating cooling system and brought huge economic losses in industrial andagricultural production, such as degrading heat conducvitivity efficiency and eating intopipeline. High-frequency electromagnetic anti-scaling method due to simple operation,no pollution, little investment and other characteristics had been extensive research andapplication.Starting from the mechanism of the scale formation, this paper analyzed theformation process of scale, which including the formation of nucleation, crystal growth,crystal aggregation. Also the factors affecting the formation of scale were analyzed,which consisted of the heterogeneity of the environment, temperature, impurities,viscosity, crystallization rate and solution PH. The principle of high frequencyelectromagnetic anti-scaling were elaborated as well as the influence factors ofanti-scaling effect, and analyzed electromagnetic field distribution of two commonprocessing chambers, one is processing chamber with coaxial electrode(PCCE) and theother is processing chamber wrapped by spirals(PCWS). It was hold that PCCE can beanalyzed using electrical quasi-static field approximation, while the PCWS usingmagnetic quasi-static field approximation, and then deduced the formula of the electricfield strength and energy of PCCE, as well as the formula of the magnetic field strengthand energy of the PCWS. On this basis, the electromagnetic simulation software ansoftMaxwell was used to analyze the electrical field and magnetic field, and the simulationresults were consistent with the theoretical analysis. Then, the electromagnetic fieldenergy of processing chamber was calculated according to the formula of theelectromagnetic field energy, and the simulation results showed that when applied thesame excitation source and processed the same volume of water, the electromagneticfield energy of PCCE was9times of that PCWS. Therefore, it was believed that theanti-scale effect of PCCE was better than that of the PCWS.The descaling-scale and anti-scale experiments were designed and completed. Thispaper studied the impact of high-frequency signal amplitude and frequency, as well aswater quality on the scale effect. In this experiments calcium ion concentration andconductivity, PH value and crystal size were measured and crystal morphology was observed, the inhibition rate was also calculated. It was found that when the excitationsource put100V, the best anti-scaling effect of PCCE was obtained at66kHz and400kHz in the frequency of the excitation source, while the PCWS was at200kHz and300kHz, and the inhibition rate was59.5%and48.3respectively. The experimentalresults verified the theoretical analysis and the simulation analysis of speculation thatthe anti-scaling effect of PCCE was better than that of PCWS. It was found that within acertain range, the greater voltage amplitude of the excitation, the better effect of theanti-scaling. Frequency sweep experiments of PCCE were processed, and the scanfrequency from350kHz to450kHz when the inhibition rate reached66.9%, better thanthe fixed-frequency. Finally, the descaling experiment was conducted, excitation sourceoutput the high frequency signal of100V,66kHz, and there were a lot of old scale falloff at the bottom of water tank after36hours processing, which revealed that highfrequency electromagnetic water processor had good descaling effect.