Research On The Key Technology Of Automation In The Intermittent Production Process Of Fine Chemicals

This project is designed for a company’s fine chemical automation production line.According to the production process and the requirements for automation system,an automatic production system with S7-300 PLC as the core and TIA Portal as the monitoring interface and operation interface is designed.The writing and debugging of Step7 program and TIA Portal interface have been completed.Some key problems in the process of fine chemical batch production have been solved.First,according to the research of this subject process,the production process of this process was introduced.Combined with the characteristics of production process and automation requirements,the overall design scheme and framework of the process control system based on Siemens S7-300 PLC was designed.On this basis,the equipment statistics and selection of WRE-3R process control system,the statistics and allocation of I/O points,the hardware configuration and network configuration are completed,and the software design of control system is completed.The key technologies for the separation of organic and water systems were studied.The control strategy of the new scheme was elaborated.A mathematical model of the flow rate was established.The flow state of the fluid was verified by calculating the Reynolds number of the fluid,and solve the problem of reverse mixing caused by the flow of the separation process.Determine the installation distance between the conductivity meter and the shut-off valve,and solve the problem of excessive residual water phase in the gravity separation process.The preparation of the control program was completed according to the new plan,and the effectiveness of the new program was further verified through experiments.The key technologies for pressure transfer are studied.Based on the equipment properties and process parameters,a mathematical model of the transfer pressure and pressure compensation pressure was established,and the optimal transfer pressure and pressure compensation parameters were determined.The mathematical models are established for the time of pressure compensation and end point judgement in the process of material transfer.The ideal time of filling and terminal judgement time are determined,and the problem of judging the end point of pressure feed is solved.The preparation of the pressure transfer program was completed and the results were validated by field experiments.The key technology of the medium intelligent switching in the reactor jacket is studied,and the solution of the temperature control system suitable for this project is put forward.The judgement strategy of jacket medium is put forward to solve the problem of intelligent judgement of medium,and the mathematical model of air pressure time is established to solve the problem of judging the end point of medium pressure.The simulation of Siemens PLCSIM simulator is used to verify the effectiveness of the medium intelligent switching scheme.The simulation and field debugging of the whole automation system have been successful.The production and operation of the system is reliable.The automation degree of the fine chemical batch production process has been improved,and some key technologies and problems in the previous production process have been solved,which meet the production process requirements and achieve the desired results.