The Research Of DCS Communication And Soft Sensor And Its Application To Butadiene Plant

Recently, with the becoming severely market competition and environment requirements force companies to improve their productivity and efficiency, which poses new requirements on process control and process optimization, as a result, more severe requirements are posed on process modeling.All industries' purposes are getting the eligible product. The core of all controls is quantity control. In order to achieve good quantity control, we should control product quantity or correlative process variable severely. On-line analysis instruments have several disadvantages including costly price, great lag etc., which lead to descend of control system's performance and can't meet production requirements. For example, in order to solve these variables measure such as distillation tower production component,tray efficient,reactant concentration,conversion and so on in petrochemical produce. Soft sensor technique has greatly developed.Soft sensor technique has been studied and discussed in this dissertation deeply. Apply multivariable linear regression,multivariable step-wise regression and artificial neural networks to establish mathematical model, and realize the advanced process control system in Fisher-Rosemount DeltaV DCS.The research works can be summarized as follows:(1) Discuss the development and research of process control firstly. Analyze and expatiate the existing production.(2) Without the communication interface between DeltaV DCS and Supervise Computer, we design a scheme of communication system between DeltaV DCS and PC, and then apply it to access process data, and then deposit them to database.(3) Make use of multivariable linear regression,multivariable step-wise regression and artificial neural networks and so on to establish corresponding mathematical model.(4) OPC(OLE for process control),which is the application of Microsoft's Object Linking and Embedding technology in process control system, provides a unified standard for Object-Oriented Design in industrial automation software. A standard mechanism for communicating to numerous data sources, either devices on the factory floor, or a database in a control room is the purpose for OPC.(5) Use the flat development of DeltaV DCS to configure,download and realize the model arithmetic in DeltaV DCS to achieve advanced process control...