Design And Realization Of Wastewater Reuse Control System Based On NetLinx Network Architecture

Waste water reuse is related to the national economy and the people's livelihood,but also an important initiatives to achieve the country's sustainable development strategy.In order to reduce the cost of waste water reuse and improve the water quality,it is necessary to adopt the advanced sewage reuse control technology to expend the processing scale,to improve the fully automated and intelligent control system.The large and medium-sized sewage reuse system equipment distribution is more dispersed and difficult to control.At present,the practical application of the control system has some flaw.And the waste water reuse treatment is a complex system with pure lag,nonlinearity and dynamic instability.It is difficult to establish a precise mathematical model,which affects the control effect of the whole system.In this thesis,to study from the control system design and intelligent control algorithm of waste water reuse.In this thesis,according to the actual waste water reuse project,to analyze the process and system requirements of sewage reuse treatment,and put forward the design scheme of the control system.According to the control system,the Rockwell PLC distributed control system based on NetLinx network architecture is designed,and the hardware and monitoring interface of the device control subsystem,the PLC hardware and software and the information layer of the information layer are respectively design.Using Intouch configuration software design PC monitoring interface,through the NetLinx network and the next bit machine and field detection instruments and equipment for data exchange and process control.In the NetLinx network architecture composed of Ethernet(EtherNet/IP),ControlNet and DeviceNet,the advanced control system of automation,intelligence and information is set up through hardware configuration and software programming.To meet the control needs of wastewater reuse control system.pH value of the wastewater reuse process is an important operating parameter of the system,it not only effect by temperature,season,flow and other factors,meanwhile pH value of the neutralization reaction also has extreme non-linear characteristics,the use of It is difficult to obtain satisfactory control accuracy by the conventional control method.Aiming at the control of pH value,this thesis proposes a multi-neuron self-tuning PID intelligent control algorithm based on BP neural network to control the pH value of real-time monitoring inwastewater reuse system.Simulation is carried out by Matlab.The algorithm uses trained BP Neural network to complete the parameters of the online adjustment,not only has the BP neural network identification and adaptive ability,but also has the control advantage of conventional PID,the system pH value control has good dynamic and static performance.The project through the field debugging,has been put into normal operation,the operation effect is good,the system is stable,the automation,the information degree is high,the water quality is good,it has reached the expected control target.The design and commissioning of the project will provide some experience for the design and operation of other sewage reuse control systems,and it can be widely used in various sewage reuse control systems.