Research On Intelligent Monitoring Technology To Zero Emission System Of High-salt Wastewater By MVR Evaporation

Energy conservation and environmental protection are the two foundations for the harmonious development of society.It is imperative to recycle wastewater and “zero emissions”.Evaporative crystallization is a common process for zero-emission treatment of high-salt wastewater,and MVR energy-saving evaporation technology is the key technology for process realization.This paper focuses on the automatic control technology of MVR evaporation zero emission system for high-salt wastewater.The main research contents are as follows:First,We analyzed the functional requirements of the MVR Evaporation Zero Emission System and carried out the overall planning of the monitoring system.The system builds the field controller with “PLC + touch screen”,and uses the PC and industrial control configuration software to form the upper computer,and builds the classic upper computer and lower computer structure.The PLC communicates with the touch screen and the host PC by means of the Multipoint Interface Protocol(MPI)and the RS-485 physical layer.The upper PC obtains real-time process parameters from the PLC,and can also set the system control parameters in the PLC according to the needs to realize two-way data communication and achieve the purpose of supervised control(SCC).The upper PC can also build SQL Server real-time database,in the server/client(C/S)mode,access the data in the upper PC on the remote client,master the real-time running status of the on-site system,and realize the remote monitoring function.Second,The calculation method of main process parameters of MVR evaporation zero emission system is summarized,and the case system is selected and designed.T The system monitoring parameters and control requirements were analyzed,and the main operating equipment and monitoring components were selected and designed.Third,The monitoring system software development was completed with industrial configuration environment,including the PC software based on the MCGS Universal Edition and the touch screen software system based on the MCGS embedded version.Completed system interface configuration,database configuration,hardware configuration and policy programming,and built a real-time process interface with real-time curve,historical curve,historical data extraction,network communication and other functions.Focus on the communication transmission of this system,based on MPI and PLC communication,two-way transmission of data.Fourth,The remote monitoring function of the monitoring system has been extended.Several modes of remote monitoring implementation are analyzed,and the network functions of host centralized mode,C/S mode and B/S mode in MCGS environment are discussed.Taking the common C/S mode as an example,the MVR remote monitoring prototype system was developed.The SQL Server real-time database was built in the upper computer.The client program was developed based on VB6.0,and the host computer database system was implemented on the remote client.Remote data access and diagnostic monitoring.