缠绕式脉冲电磁场阻垢机理及实验研究

发布时间：2018-10-31 14:15

【摘要】：循环冷却水在循环过程中,由于水分不断散失、溶解质浓缩等众多原因,造成换热设备及管道内出现结垢沉淀,致使换热效率低下甚至引发事故。由于传统化学阻垢方法存在二次污染、成本高等缺点,物理阻垢方法成为趋势,其中缠绕式脉冲电磁场阻垢技术以操作简单、费用低、见效快等优点受到广泛关注。本文基于水垢的形成机理,分析水垢形成的过程及影响因素,探究缠绕式脉冲电磁场阻垢机理。利用ANSYS模拟研究管材对管道内电磁场强度的影响,确定PVC等非金属非导磁材料应作为缠绕式脉冲电磁场阻垢处理优选的输水管材;比较管径、缠绕匝数对管道内电磁场强度的影响,模拟结果表明50匝线圈和110 mm管径配合使用,可以使缠绕式脉冲电磁场阻垢系统实现较大的性能功耗比;为缠绕式脉冲电磁场阻垢系统在实际工程中的高效应用提供技术指导。针对缠绕式脉冲电磁场阻垢线圈的电磁场强度计算模型进行研究,明确建立激励线圈中电流计算模型的必要性。以缠绕式脉冲电磁场阻垢系统为研究对象,在激励线圈等效电路基础上,建立串联电阻时激励线圈中的电流数学模型,基于电流实验数据,利用MATLAB拟合激励线圈中等效电阻和等效电感随频率变化的关系式,进而得到激励线圈中电流计算模型,最终获得缠绕式脉冲电磁场阻垢线圈的电磁场强度计算模型。通过两组实验验证激励线圈中电流计算模型的正确性和准确性。在电磁场阻垢机理的基础上,建立循环水缠绕式脉冲电磁场处理实验平台,通过实验对缠绕式脉冲电磁场阻垢机理进一步研究,实验结果表明:在本实验条件下脉冲电磁场频率为1 kHz时,缠绕式脉冲电磁场阻垢系统的阻垢效果最为显著。比较实验组与对照组发现,使用1 kHz频率的脉冲电磁场处理4个小时能够增加约0.8倍的碳酸钙结晶量,处理4个小时提高碳酸钙的结晶速率约2.4倍;处理8个小时可以提高碳酸钙在水中的溶解度约3倍。
[Abstract]:In the process of circulating cooling water, due to the continuous loss of water and concentration of dissolved matter, scaling and settling appear in the heat exchanger and pipeline, and the heat transfer efficiency is low and even causes accident. Because of the disadvantages of secondary pollution and high cost in the traditional chemical scale inhibition methods, physical scale inhibition methods have become a trend, among which the winding pulse electromagnetic field scale inhibition technology has been widely concerned because of its advantages of simple operation, low cost, fast efficiency and so on. Based on the formation mechanism of scale, this paper analyzes the process of scale formation and its influencing factors, and probes into the mechanism of scale inhibition by winding pulse electromagnetic field. The influence of pipe on the intensity of electric magnetic field in pipeline is studied by ANSYS simulation. It is determined that non-metal magnetic conductivity such as PVC should be used as the best selected pipe for scale inhibition treatment of winding pulse electromagnetic field. Comparing the influence of pipe diameter and winding number on the electric magnetic field intensity in the pipe, the simulation results show that the combination of 50 turns coil and 110 mm pipe diameter can make the winding pulse electromagnetic field scale inhibition system achieve a large power consumption ratio. It provides technical guidance for the efficient application of wound pulse electromagnetic field scale inhibition system in practical engineering. In this paper, the calculation model of electric magnetic field intensity of winding pulse electromagnetic field scale inhibitor coil is studied, and the necessity of setting up current calculation model in exciting coil is made clear. Based on the equivalent circuit of the exciting coil, the mathematical model of the current in the winding pulse electromagnetic field scale inhibition system is established, and the current experimental data are based on the mathematical model of the current in the exciting coil when the series resistance is in series. The relationship between the equivalent resistance and the equivalent inductance in the exciting coil with frequency is fitted by MATLAB, and the current calculation model in the exciting coil is obtained. Finally, the calculation model of the electric magnetic field intensity of the winding pulse electromagnetic field is obtained. The correctness and accuracy of the current calculation model in the exciting coil are verified by two groups of experiments. On the basis of the scale inhibition mechanism of electromagnetic field, the experimental platform of circulating water winding pulse electromagnetic field treatment was established, and the scale inhibition mechanism of winding pulse electromagnetic field was further studied through experiments. The experimental results show that when the frequency of the pulsed electromagnetic field is 1 kHz, the scale inhibition effect of the winding pulse electromagnetic field is the most remarkable. Comparing the experimental group with the control group, it was found that the crystallization rate of calcium carbonate was increased by about 0. 8 times and the crystallization rate of calcium carbonate was increased by about 2. 4 times after the treatment of 1 kHz frequency pulsed electromagnetic field for 4 hours. The solubility of calcium carbonate in water can be increased by about 3 times after 8 hours treatment.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB490

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