The Design And Development Of Computer Control And Monitor System For A Oil Displacement Injection Station With Gas

Combined with the design and development of the monitoring and process controlsystem of the injection station of a gas drive test project, one of the projects supported bythe national funds of a company of Changchun, the study and design of theory andengineering application of signal processing methods, application of the PLC(programmable logic controller) in the process control, principles and implementationmethods of the industrial Ethernet, realization of the human-machine interactive system,application of the PID regulating technique and detailed software algorithms is carried outin the dissertation.The author first summarizes and studies the new methods and new theories in theindustrial process control, deals with the principles of all the sensors, actuators andcontrollers widely applied at present and compares the advantages and disadvantages of thesame type of products. With the above research and conclusion, the ground monitoringsystem of a gas drive test project is developed, including choice of some elements ofmeasuring, actuation and control, determination of the main regulating and controlalgorithms, reliability design of the system software and hardware and choice of hardwaremodels and software development. The successful use of the system and verification of thepertinent experiment indicates that the system has realize some technical indexes such asaccuracy and response frequency, etc.In the dissertation, the purposes, characteristics and importance of a gas drive processare first introduced. Some aspects of the sensors, controllers and actuators in the processcontrol field related to the project are introduced and compared. And then, the combinationof the modern information technology with the process control field is described. With theabove description, it indicates the importance, necessity and feasibility of the project.Finally, the main research contents of the dissertation are determined in the part. In the dissertation, all the monitoring demands of the ground injection station projectof a gas drive process are first introduced in details. And then, according to the monitoringdemands, the determination of the measuring methods of all the physical quantities, choiceof element models, choice of actuators and determination of the quantity and types of boardcards needed by the controllers are carried out. In addition, the design and development ofthe human-machine interactive interface of the upper management computer is completed.The process quantity measuring and the choice of the actuator models of the control systemare first completed. In such a step, emphasis is given to taken into account the realizationmethods of choosing the different actuators according to the different characteristics of theinjection pump outlet and50m3storage tank outlet pressure. By now, the automaticregulating and control plan of the whole system has been determined. In the second step,the functional design of the controller is carried out, the use of the PID control method asthe control strategy of the system is determined and the quantity and tasks of the auxiliaryfunctions are arranged in details. In the third step, the functions of the human-machineinterface are designed and the choice of types and functions of the human-machineinterface are determined.The system development is the realization of the overall design plan. The developmentprocess of the system is also the key part of the dissertation. In such a chapter, the authorintroduces the development of the system from4aspects. The first is the hardwareconfiguration of the controller and the electric system. In such a part, the model choice andcharacteristics of all the modules of the controller are described in details and the principlesof configuration of the electric system are described; and then, the realization of thecommunication functions of the system is described and the principles of thecommunication system, topographical structure and protocols are described in details; thethird step is to describe the development of the human-machine interface of the system, thecontents of all the images and functions of all the controls. Finally, it is the core part of thedevelopment process of the system. In such a step, the software programming of PLC iscompleted and most of the conceptions in the overall design shall be realized in this part.The author uses the flow chart mode to describe the realization of the algorithms of themain parts of the program in details. As a whole, such steps are not carried out in order in the development process of the actual system and the crossing method is often taken tocontinuously repeat and improve the development of the system. It is only divided into twoseparate parts logically in the writing of the dissertation.The two experiments are designed for the system to verify all the logic actions anddynamic response performance as well as accuracy of the system as a whole, respectively.In the dissertation, the recorded experimental data are transformed into the curves andanalyzed. The final results of the experiments fully prove that the control method taken isappropriate and the overall design is successful.