DCS, PLC - in the application of vinyl acetate production line design Industrial control -

One, the system description vinyl acetate is a kind of important industrial raw material, the market is very broad. Its production process is mainly divided into two processes: synthesis and rectification. The former is chemical reflect the generating process of vinyl acetate, the latter is the generated by vinyl acetate, physical process for purification. The process flow diagram is as follows:

2, this process features and difficulties of vinyl acetate

production is a tower body very much system, regulating circuit is numerous, the system is very strong, the correlation of the stand or fall of a parameter control directly affect the success or failure of the control of other parameters. A system of movements could bring down the entire system. Concentration of vinyl acetate, because its product requirement is very high, up to 99. More than 9%, so the reaction temperature, and flow parameters, such as control requirements is very smooth, synthesis reactor temperature requirements in 170 plus or minus 0. 5 degrees, plus or minus 1% acetic acid evaporator liquid level requirements, and acetylene flow is very unstable, control is not very good. These are to control the precision of the high demands are put forward.

3, process

to the requirement of control system, a centralized monitoring for the achievement of the unit operations, including: physical quantities, such as temperature, pressure, flow, liquid level monitoring and control. Dynamic parameter detection and control must be accurate and reliable. Synthesis reactor temperature requirements in 170 plus or minus 0. 5 degrees, plus or minus 1% acetic acid evaporator liquid level requirements, b, and the necessary control measures, to emergencies such as power, system should take the corresponding protective measures to ensure that in case of emergency or in times of need for some critical control points ( Valves, motors, etc. ) The implementation of remote control. C, configure the necessary alarm and interlock. D, the record of the important parameters, and easy access to real-time trends and historical trend. E, may at any time monitoring the related parameters of the unit or the operating condition of important equipment. F, the control system simple operation, parameter setting, convenient adjustment, easy operation, humanized operation interface. G, operator station to show the whole production process, modify and print all kinds of related parameters.

2, network structure, system composition 1

two field control station and three monitoring stations, adopting a redundancy double (dual) bus to connect control station and monitoring station. In addition to any one with bus fault, the system can run normally. Greatly increase the stability of the communication system, the connection structure is as follows:

2, system configuration of this control system USES a three monitoring stations, and two control stations at the scene. Stability. Two field control station also took the hot standby redundancy, any malfunctioned, automatically switch to another in normal operation. Also increases the reliability and stability of the system. All of the analog output taken hot standby, and display parameters are also important to take the hot standby. 。 All analog adopted and the signal of photoelectric isolation, all the signals through the security gate.

3, control strategy and implementation plan for many years, it is a good source of hunan automation engineers ( D the company committed to the automation system integration, information system ( Including ERP system MIS system and MRP system) Development of PLC controller, DCS system development, system development, low-voltage distribution cabinets, such as variable frequency soft up ark transmission system development) PID adjustment

in the production of vinyl acetate due to the reactor temperature control is strict, plus or minus zero point five degrees, and he has not good or bad relationship to the quality of the final product, and so on the reaction temperature control adopted cascade control. Its structure diagram is as follows:

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