海水旋转滤网清污设计
发布时间：2018-09-02 06:30
【摘要】：旋转滤网是工业上循环冷却水系统中的重要组成设备，是水处理过程中的重要屏障。通过对滤网前后液位的测量，判断滤网水渠道中污物的阻塞程度，通过滤网旋转对污物进行清除。传统的旋转滤网设备控制方式单一，电能浪费严重。工频启动时启动电流大，会造成滤网电机过载，影响工厂正常生产和带来安全问题。因此，旋转滤网系统的控制技术越来越受到人们的关注。研究节能高效的旋转滤网系统具有重要的的意义。 本文根据交流异步电机的转速公式，对交流异步电机的调速方法进行了分析，并对变频调速的基本原理进行了阐述。对电机各种调速方法的启动性能进行了分析。针对变频器在节能方面的优势进行了论述。采用液位传感器对旋转滤网水渠道阻塞程度进行检测，提出了旋转滤网按照正弦规律变化的运动方式，完成了系统的软件、硬件设计。 本系统由液位传感器、变频器、PLC及其他外围设备组成。液位传感器为水渠道检测环节，变频器与PLC为控制环节。在水渠道堵塞检测环节，采用液位回差滞回比较方式，减小了水渠道液位波动对水渠道污物阻塞检测的影响，提高了旋转滤网的抗干扰能力；在控制环节，利用变频技术，使旋转滤网在变频启动方式下启动并做正弦规律的变频运行，减少了启动电流对设备的冲击，提高了清污效率，节约了电能。 系统工作流程为：通过模拟量扩展模块采集液位模拟信号，经过PLC分析滤网水渠道的阻塞程度，，向变频器发出正弦规律变化的频率值命令，使旋转滤网做旋转速度按照正弦规律变化的运动。利用安装在电气控制柜中的触摸屏进行参数的显示和设定，并通过Modbus通信协议，将实时数据和功能参数传送至总控室进行集中控制和显示。 本系统成功的实现了海水旋转滤网污物的清除。通过比较两类变频调速的方式，证明了无极调速方式相对于有极调速方式在工作效率、节约电能等方面具有较大的优势。系统稳定性好、能耗低、高效率，满足了工厂需求。
[Abstract]:Rotary filter is an important equipment in industrial circulating cooling water system and an important barrier in the process of water treatment. By measuring the liquid level before and after the filter screen, the blocking degree of the sewage in the filter water channel is judged, and the sewage is removed by the filter rotation. The traditional rotary filter equipment control mode is single, the electric energy is wasted seriously. When the power frequency starts, the starting current is large, which will cause the filter motor overload, which will affect the normal production of the factory and bring about safety problems. Therefore, people pay more and more attention to the control technology of rotary filter system. It is of great significance to study the energy saving and high efficiency rotary filter system. According to the speed formula of AC asynchronous motor, this paper analyzes the speed regulation method of AC asynchronous motor, and expounds the basic principle of frequency conversion speed regulation. The starting performance of various motor speed regulation methods is analyzed. The advantages of inverter in energy saving are discussed. The liquid level sensor is used to detect the blocking degree of the rotary filter water channel. The moving mode of the rotating filter according to the sine law is put forward, and the software and hardware design of the system is completed. The system consists of liquid level sensor, frequency converter PLC and other peripheral equipment. The liquid level sensor is the water channel detection link, the frequency converter and PLC are the control links. In the detection of water channel blockage, the effect of liquid level fluctuation on water channel fouling detection is reduced by using the method of level difference hysteresis comparison, and the anti-interference ability of rotary filter screen is improved, and in the control link, frequency conversion technology is used. The rotary filter is started in the mode of frequency conversion and the frequency conversion operation of sinusoidal law is done, which reduces the impact of starting current on the equipment, improves the efficiency of decontamination and saves the electric energy. The work flow of the system is as follows: the analog signal is collected by the analog extension module, the blocking degree of the filter water channel is analyzed by PLC, and the frequency value command of sinusoidal variation is issued to the frequency converter. Make the rotating filter to make the rotation speed changes in accordance with the law of the sine. The parameters are displayed and set by the touch screen installed in the electric control cabinet, and the real-time data and function parameters are transmitted to the master control room for centralized control and display through the Modbus communication protocol. The system has successfully realized the sewage removal of seawater rotary filter. By comparing the two kinds of variable frequency speed regulation methods, it is proved that the non-pole speed regulation mode has a great advantage in working efficiency, saving electric energy and so on. System stability, low energy consumption, high efficiency, meet the needs of the factory.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P746
[Abstract]:Rotary filter is an important equipment in industrial circulating cooling water system and an important barrier in the process of water treatment. By measuring the liquid level before and after the filter screen, the blocking degree of the sewage in the filter water channel is judged, and the sewage is removed by the filter rotation. The traditional rotary filter equipment control mode is single, the electric energy is wasted seriously. When the power frequency starts, the starting current is large, which will cause the filter motor overload, which will affect the normal production of the factory and bring about safety problems. Therefore, people pay more and more attention to the control technology of rotary filter system. It is of great significance to study the energy saving and high efficiency rotary filter system. According to the speed formula of AC asynchronous motor, this paper analyzes the speed regulation method of AC asynchronous motor, and expounds the basic principle of frequency conversion speed regulation. The starting performance of various motor speed regulation methods is analyzed. The advantages of inverter in energy saving are discussed. The liquid level sensor is used to detect the blocking degree of the rotary filter water channel. The moving mode of the rotating filter according to the sine law is put forward, and the software and hardware design of the system is completed. The system consists of liquid level sensor, frequency converter PLC and other peripheral equipment. The liquid level sensor is the water channel detection link, the frequency converter and PLC are the control links. In the detection of water channel blockage, the effect of liquid level fluctuation on water channel fouling detection is reduced by using the method of level difference hysteresis comparison, and the anti-interference ability of rotary filter screen is improved, and in the control link, frequency conversion technology is used. The rotary filter is started in the mode of frequency conversion and the frequency conversion operation of sinusoidal law is done, which reduces the impact of starting current on the equipment, improves the efficiency of decontamination and saves the electric energy. The work flow of the system is as follows: the analog signal is collected by the analog extension module, the blocking degree of the filter water channel is analyzed by PLC, and the frequency value command of sinusoidal variation is issued to the frequency converter. Make the rotating filter to make the rotation speed changes in accordance with the law of the sine. The parameters are displayed and set by the touch screen installed in the electric control cabinet, and the real-time data and function parameters are transmitted to the master control room for centralized control and display through the Modbus communication protocol. The system has successfully realized the sewage removal of seawater rotary filter. By comparing the two kinds of variable frequency speed regulation methods, it is proved that the non-pole speed regulation mode has a great advantage in working efficiency, saving electric energy and so on. System stability, low energy consumption, high efficiency, meet the needs of the factory.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P746
【参考文献】
相关期刊论文 前10条
1 钱照明,张军明,吕征宇,彭方正,汪i裆
本文编号：2218545
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