基于DCS的PVC引发剂生产过程控制系统设计
[Abstract]:The quality of PVC initiator, as the main factor to control the polymerization rate of vinyl chloride, directly determines the quality of PVC products. In the process of producing PVC initiator, the temperature control requirement is very strict, but in different stages of production, the reaction kettle temperature control becomes very difficult and complex after the interaction of various materials. In this paper, a PVC initiator production distributed control system is designed, and the automation of the production process is realized by using the related bottom algorithm. Firstly, the production process of PVC initiator, the reaction process of rubber and metal adhesives and the control requirements of safety production interlocking are introduced. The overall structure of the whole DCS system is designed, which is divided into three parts: management information layer, operation layer and redundant control layer. Secondly, the hardware design of PVC initiator production control system includes the introduction of DCS product manufacturer and model, the communication of main control card, the function and selection of various card parts, and the selection of workstation. And with Zhejiang University ECS-100 as the platform for all kinds of card placement layout. Considering the security and stability of the control system, the design of distribution redundancy and network redundancy is carried out in order to prevent the serious consequences of the sudden situation. Then, the configuration design of the whole DCS system is carried out. Including master control card design, engineer station and operator station configuration, I / O card configuration, flowchart drawing, etc. Based on the configuration software AdvanTrol-Pro2.65 of Zhejiang University, the monitoring interface of PVC initiator is designed, and the signal points in the production process are monitored in real time and effectively, so that the operator can control the whole process and make it easy to carry out. Automatic switching. In order to automate the production of initiator, we need to design the underlying algorithm according to the requirement. In the process control, conventional control strategies are used, such as single loop control strategy, cascade loop control strategy, proportional control strategy and fractional control strategy. In order to solve the problem that the reaction temperature of rubber metal adhesive has strong hysteresis and is difficult to control, an advanced control algorithm-Predictive function Control is proposed to realize the accurate control of the production of the initiator. Finally, after the PVC initiator production control system is designed and implemented, the whole system is run and debugged. In this paper, the scheme and steps of running and debugging are explained, the monitoring screenshots of flow chart of operation and debugging of PVC initiator production control system are given, and the relevant temperature curves are analyzed to draw a conclusion.
【学位授予单位】:青岛科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TQ325.3;TP273
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