The Intelligence Monitoring System Of Heat-Exchanging Station Design And Implementation

With the rapid development of the modern city,and human whoes environmentalprotection awareness constantly enhance,the importance of the urban central heatinggradually been put on the agenda.The heating enterprises used boiler room to provideheat for the residents mainly in coal-fired way.and the impact of coal pollution andnoise pollution to urban residents is Larger.And energy waste phenomenon is moreserious.So the traditional boiler room heating mode is gradually replaced by urbancentralized heat supplying system.How to maximize to save energy,and the guaranteethe heating quality of residential housing and industrial production of heat energydemand which are becoming more concerned problem for heating companies.And theheat exchange station as the intermediate links which used to ensure heating qualitywhose effect is irreplaceable.The engineering background of design is based on putting a boiler room ofresidential area incorporate into the city central heating system.From consideration oflower production costs and save energy, and ensure residents heating quality as thestarting point.And we design the intelligence monitoring system of heat-exchangingstation,The monitoring system includes two parts,and one part used the PROFIBUS-DPfieldbus to realize local monitoring,the other used the GPRS wireless network toachieve to monitor heating network center.The monitoring system including threeparts.they are the control of secondary water supply temperature (control valve)、Thefrequency conversion constant temperature difference control of circulatory system andfrequency conversion constant pressure control of the replenishment system.In the PCclient of local control station and remote controller,we used the Siemens WinCC6.0configuration software realize to collect data、storage data、display data、alarm andprint etc for main parameters in the control process.The main part of design is cascadecontroller of the secondary water supply temperature control. And proposed the secondary water supply temperature control strategy.Analysis the disadvantages of pastmethod which used to obtain secondary water supply temperature default values,weused fuzzy controller to obtain the default value in control strategy.At the same time weconsider the characteristics of controlled object of heat exchange station that arenonlinear and parameter change,and used fuzzy parameters self-tuning PID controller toreplace traditional PID controller,to track the secondary water supply temperaturedynamically.The cascade controller is constructed directly in the S7-200PLC.Andsimulating in Fuzzy Logic Toolbox of Matlab software and Simulink software,andsimulation results shows that the control scheme which we adopts have someadvantages which are fast response,no overshoot etc.In this paper, the design of heat exchange station intelligent remote monitoringsystem can reduce the work intensity of workers, and improved the economic and socialbenefits of the heat transfer station.The control strategy adopted in this topic applies tothe gas pipeline network, smart grid, and other industrial control field equally.