基于DCS的PVC引发剂生产过程控制系统设计

发布时间：2018-11-25 17:55

【摘要】：PVC引发剂的品质作为控制氯乙烯聚合速率的主要因素,直接决定了PVC产品质量的高低。在生产PVC引发剂的控制过程中,对于温度控制要求格外严格,而在生产过程的不同阶段,各种物料相互作用后使得反应釜温度控制变得异常困难、复杂。针对此类情况,本文设计了一套PVC引发剂生产集散控制系统,并且运用相关底层算法,实现了生产过程的自动化。首先,介绍了PVC引发剂的生产工艺流程、橡胶金属胶黏剂反应流程以及安全生产联锁控制的控制要求。设计了整套DCS系统总体结构,并将其分为管理信息层、操作层和冗余控制层三个部分进行一一介绍。。其次,对于PVC引发剂生产控制系统进行硬件设计,主要包括了DCS产品厂家及型号介绍、主控制卡的通讯、各类卡件的功能及其选型、工作站选择,并以浙大中控ECS-100为平台对各类卡件的安放进行布局。在充分考虑维持控制系统的安全性和稳定性,对该控制系统进行了配电冗余设计和网络冗余设计,以预防突发状况发生带来的严重后果。然后,对于整套DCS系统进行组态设计。包括主控制卡设计、工程师站与操作员站配置、I/O卡件配置、流程图绘制等。基于浙大中控组态软件AdvanTrol-Pro2.65完成PVC引发剂的监控界面设计,对生产过程的各个信号点进行实时有效的监测,实现操作人员对整个过程的操控,方便其进行手、自动的切换。为实现引发剂生产的自动化,需要依据需求设计相关底层算法。在此过程控制中,运用了常规控制策略,如:单回路控制策略,串级回路控制策略、比例控制策略和分程控制策略等。针对橡胶金属胶黏剂生产反应温度控制滞后性强,难以控制的问题,提出采用一种先进控制算法——预测函数控制,来实现对引发剂生产的精确控制。最后,在完成PVC引发剂生产控制系统整体设计与实施后,对整套系统进行运行调试。说明了运行调试阶段的方案与步骤,给出了PVC引发剂生产控制系统运行调试的流程图监控截图,并分析了相关温度曲线得出结论。
[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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