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This paper introduces the basic production process aromatics process, the chosen instrument of the working principle of circuit, as well as the structure of the principle of distributed control system, in this production. After system in operation and high reliability, strong function, simple operation, to ensure that the production of long-term, stability, greatly reduces the maintenance workload, increased the degree of automation. Selected two single-loop control system, from n-pentane, as well as tower reboiler return from pentane tank tower.

Naphtha tower through the reaction from n-pentane n-pentane boiling off from the tower along the pipeline by the beginning of cooling, to a device under the need to re-boiling, so to go through off-pentane reboiler tower, re-heating to boiling. The device used in the pressure of steam (MS) into a heated medium-pressure condensation of water vapor condensation (MC) process. Naphtha tower through the condenser off after pentane, n-pentane into the tower from the buffer tank. Naphtha oil storage tank top body material, a water tank at the end of packet. Long-term placement of naphtha, which water will penetrate into the water below, and the passage of time, this will form a certain amount of liquid.

From pentane tower reboiler plate selection of single-loop differential pressure transmitter increases as the detection of transmission links, optional pneumatic actuator control valve. Returning from pentane tank tower intelligent choice of single-loop detection buoys as a transmission link, the actuator is pneumatic control valve. The entire control systems are Distributed Control System.

最后两段打不上了,多了!你看看前面的!