发电厂脉冲高压静电水处理监控系统的研究

发布时间：2018-09-09 17:34

【摘要】：目前,循环冷却水系统在电厂有着广泛的应用。而在循环冷却水系统运行过程中,循环冷却水系统会出现结垢、金属腐蚀和微生物的生长等问题。为了保证循环冷却水系统的正常运行,必须对循环水进行水处理。传统的化学水处理方法,是在循环水中加入大量化学药剂来实现阻垢除垢、杀菌灭藻、缓蚀的效果。这就需要大量的化学药剂费用,并且投入的化学药剂会对环境造成污染,既给发电厂造成了很大的经济负担,也不符合国家节能减排的政策要求。针对以上问题,本文提出了一种利用脉冲高压静电水处理装置对循环水进行处理并且对水处理过程进行监控的系统—脉冲高压静电水处理监控系统。脉冲高压静电水处理装置是一种新型的物理水处理装置,它由高压脉冲电源和水处理腔体两部分构成。高压脉冲电源作为水处理腔体的驱动电源,在水处理腔体内的不锈钢棒和设备外壳之间会产生高压脉冲电场,从而实现对流过循环水的水处理。脉冲高压静电水处理装置操作简单,运行成本低,对环境无污染,能够有效解决循环冷却水系统存在的以上问题,且灭菌效果好,电能消耗低。本文首先对水处理装置的腔体结构进行了设计,通过对水处理腔体内部的电场强度分析,了解在绝缘层和循环水中的电场强度分布情况,通过ANSYS有限元分析软件对水处理腔体内部的电场分布进行仿真,从而实现对水处理腔体不锈钢棒和最佳循环水通道管径的设计。其次,对脉冲电源的高压直流电源电路、触发脉冲控制电路、高压脉冲产生电路等进行了设计。根据脉冲高压静电水处理监控系统的功能需求,本文从硬件和软件两个方面对脉冲高压静电水处理监控系统进行了设计和研究。监控系统硬件设计上采用了PLC作为控制器,实现对脉冲电源幅值的控制,并且对温度、极化率、真空度的数据参数进行采集,采用无线通信模块将数据上传到上位机监控软件。上位机监控软件利用VB进行设计,通过上位机软件来实现数据保存、数据查询、曲线显示、报警记录、异常数据报警等功能。最后通过实验证明,本文设计的脉冲高压静电水处理装置能够很好的起到防垢、除垢、杀菌灭藻的效果,上位机软件实现了对冷却水系统中参数的显示、保存、打印、报警等功能,可以通过上位机和触摸屏对水处理装置的参数进行调节,实现了对脉冲高压静电水处理的监控功能。
[Abstract]:At present, circulating cooling water system is widely used in power plant. However, during the operation of the circulating cooling water system, scaling, metal corrosion and microbial growth will occur in the circulating cooling water system. In order to ensure the normal operation of circulating cooling water system, circulating water must be treated. The traditional chemical water treatment method is to add a large number of chemical agents to the circulating water to achieve the effect of scale and scale inhibition, bactericidal and algal control and corrosion inhibition. This requires a large amount of chemical costs, and the input of chemical agents will cause environmental pollution, which not only causes a great economic burden to power plants, but also does not meet the requirements of the national policy of energy saving and emission reduction. In order to solve the above problems, this paper presents a system which uses pulse high voltage electrostatic water treatment device to treat circulating water and monitor the process of water treatment, that is, pulse high voltage electrostatic water treatment monitoring system. Pulse high voltage electrostatic water treatment device is a new type of physical water treatment device, which consists of two parts: high voltage pulse power supply and water treatment chamber. As the driving power of the water treatment chamber, the high voltage pulse power supply will produce a high voltage pulse electric field between the stainless steel rod in the water treatment chamber and the shell of the equipment, thus realizing the water treatment through the circulating water. The pulse high voltage electrostatic water treatment device is simple in operation, low in operating cost and no pollution to the environment. It can effectively solve the above problems existing in the circulating cooling water system, and has good sterilization effect and low power consumption. In this paper, the structure of the water treatment chamber is designed, and the distribution of the electric field intensity in the insulating layer and the circulating water is understood by analyzing the electric field intensity inside the water treatment chamber. The electric field distribution inside the water treatment chamber is simulated by ANSYS finite element analysis software, so that the design of stainless steel rod and the optimum diameter of circulating water channel can be realized. Secondly, the high voltage DC power supply circuit, the trigger pulse control circuit and the high voltage pulse generation circuit are designed. According to the functional requirements of the pulsed high voltage electrostatic water treatment monitoring system, this paper designs and studies the pulse high voltage electrostatic water treatment monitoring system from the two aspects of hardware and software. In the hardware design of the monitoring system, PLC is used as the controller to control the amplitude of the pulse power supply, and the data parameters of temperature, polarizability and vacuum are collected, and the data is uploaded to the monitoring software by wireless communication module. The upper computer monitoring software is designed by VB. The functions of data preservation, data query, curve display, alarm record, abnormal data alarm and so on are realized by the upper computer software. Finally, it is proved by experiments that the pulse high voltage electrostatic water treatment device designed in this paper can play a good role in scale prevention, scale removal, bactericidal and algae killing, and the upper computer software can display, save and print the parameters in the cooling water system. The parameters of the water treatment device can be adjusted by the upper computer and the touch screen, and the monitoring function of the pulse high voltage electrostatic water treatment can be realized.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM62

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