Research And Practice Of Temperature Control Strategy In Oxidation And Synthesis

Carbon Dioxide Cumene (DCP) is widely used in industrial producing. Therefore, it is particularly important. While in the process of DCP producing , the most difficult thing is to control DCP oxidation process well. It is a multivariable, strong coupling and large inertia process. Unfortunately, the traditional control strategy can hardly adapt to the complex control system. So, in order to achieve the best effect of DCP oxidation reaction,the subject is trying to study advanced intelligent control strategy based on the traditional industrial control ones and of great significance to realize high concentration, high production and high efficiency of industrial production as well.Having consulted many relevant articles about general situation of DCP oxidation reaction process and recent national and international researches of intelligent strategies of controlling temperature, we have studied the strategy based on TS fuzzy PID and the main achievement of the research we have made is as follows:According to analysis the basic principle, process flow and operation method of DCP oxidation process, we made sure of the key parameters which closely connected to the oxidation process and the selection of the hardware and instruments. We designed the cascade control system with the main parameter of the temperature inside the oxidation tower and the secondary parameter of the temperature inside the pipeline. Finally, we determined the main control strategy.Based on the main control strategy, the control strategy of the temperature inside the tower based on the TS fuzzy PID control model was studied. With the help of the engineering experience, the expert database and a large amount of actual data, the fuzzy controller were created. At last, the simulation result shows that: firstly, the rapid response of temperature can be realized at the initial stage of the reaction. Secondly, it is effective to adjust the PID parameters in the stable situation in every seconds. Obviously, the overshoot was suppressed and the temperature error is always controlled within ± 2? more or less.We used the PLC to establish the control system of DCP oxidation reaction and the Siemens SIMATIC S7-300PLC was chosen as the controller according to the actual operation demand. The module selection, I/O circuit design and hardware configuration were then carried out. We have studied the framework of PLC control program, the method of data acquisition and the scale conversion in the transmitter. Finally, programming the software of PLC.We constructed the upper computer monitoring system, realized the Ethernet communication protocol between upper computer and lower computer and the communication between PLC master station and slave station with industrial fieldbus protocol. We used WinCC as the software development platform of the monitoring system to set the monitoring picture and program of DCP oxidation reaction. Eventually, the functions of process monitoring, interface operation, real-time curve display and user management are realized and the results of the operation indicate which have been achieved as well as we expected.