摘要
在工业循环冷却水系统中,污垢的存在给换热设备的设计和运行造成了巨大的经济损失,并且传统的阻垢方法存在二次环境污染、成本高等缺点。而电磁场阻垢技术具有使用方便、无污染、成本低等其他方法不可比拟的优点。通过分析总结,为了适用于不同的水质,利用DDS技术和功率放大技术,设计了一套高频电磁阻垢装置,输出为0～1MHz范围内连续可调的单一频率和扫频的方波信号。并在实验室搭建了动态循环水管道系统以便模拟工业循环水系统。研究表明:外加高频电磁场作用后,CaCO3的结晶速度变小。通过扫描电镜观察,处理后的CaCO3晶体结构一部分由原来的方解石变成了文石。此外,阻垢效果还与输出频率和Ca2+浓度有关,输出频率并不是越高越好,而Ca2+浓度不宜超过5mmol/L。
In industrial cycling cooling water system, the dirt of heat exchanger causes enormous economic losses, and the traditional anti-scaling method has disadvantages, such as secondary pollution, poor results and high cost, etc. While the anti-scaling of electromagnetic field is convenient, pollution-free and low cost. These are advantages that other methods don＇t have. A high-frequency electromagnetic device with DDS and amplifier technology for different water is designed, and its output is single frequency and sweep of the square wave signal within the scope of 0~1 MHz. A dynamic circulating water system is set up in laboratory to simulate industrial water cycling system. The research results show that external high- frequency electromagnetic field slows down the crystallization rate. Part of original calcite comes into aragonite. In addition, the effect of anti-scaling is effected by the concentration and output frequency, while the higher output frequency doesn＇t always obtain better result, and the concentration of calcium should not be more than 5 mmol/L.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第1期45-51,64,共8页
Journal of Chongqing University
基金
重庆市科技攻关计划资助项目(2008AC7085)
关键词
电磁场
阻垢
碳酸钙
电磁阻垢
DDS
electromagnetic fields
anti-fouling
calcium carbonate
electromagnetic scale
DDS
