| In recent years,with the rapid increase of population and serious waste of water resources,the supply of personal water resources has been drastically reduced.Seawater desalination technology can fundamentally solve the problem of water shortage.Low temperature multi-effect seawater desalination technology is the preferred technology of seawater desalination.The technology has the advantages of low operating temperature and low requirement for seawater pretreatment,and also has the problems of large system volume,bad environment and high control requirements.In this paper,a remote monitoring and control system for low-temperature multi-effect desalination based on NB-IoT(narrowband Internet of Things)technology is designed with the background of the "Twelfth Five-Year Plan" low-temperature multi-effect distillation pilot plant and the latest narrowband Internet of Things wireless communication technology and front-end web page design technology.In this paper,the technology of low temperature multi-effect seawater desalination is studied and analyzed,and the technological process and working characteristics of the technology are analyzed.It is known that the control process of the system has the characteristics of nonlinearity,complexity and large time delay.According to these operating characteristics of the main equipment temperature,the controller of compound control PID algorithm is designed to meet the requirements of temperature control accuracy and speed.The simulation results show that the controller meets the control requirements of the pilot plant and improves the stability and accuracy of temperature control.The first part of the design of the monitoring system collects and transmits the operation data information of the cryogenic multi-effect pilot plant,completes the software and hardware design of some systems.According to the communication protocol between the terminal and the platform,the wireless communication technology is adopted,and the message transmission between the pilot plant and the monitoring platform is completed by using NB-IoT technology,so as to realize the purpose of remote monitoring.The system solves the problem of remote centralized control well,and can monitor the operation of the desalination system quickly and in real time.It is very helpful to improve the output of desalination equipment.The second part of the monitoring system designs a Web system based on B/S architecture.This system provides convenience for users.It only needs a PC or a smart mobile device to know the scene.The information display of the monitoring platform is in the form of Browser.Because of the large number of monitoring terminals,MySQL is used as the storage database to realize the functions of data transmission,monitoring,convenient query and persistent storage.In addition,HTML + CSS + JavaScript programming technology and some advanced front-end frameworks are also used in the design of Web front-end pages,which not only improves the performance of the system,but also improves the userexperience.Through testing and analysis of the complete remote monitoring and control system,the feasibility of the monitoring system is proved,which not only promotes the cost and energy consumption of the low-temperature multi-effect pilot plant,but also meets the needs of users for real-time,accuracy,efficiency and simple operation. |
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