Abstract
In PX plant, the isomerization radial reactor is one of the key equipments. Because of the ratio of the hydrogen and oil is as high as 4.8~5 in isomerization reactor and the efficiency of the transformation is lower. Hydrogen and unreacted C8 goes to the reactor circularly and cause the system high pressure loss, so it is critical to reduce the energy consume and the radial flow reactor is used by the most of the manufacturers.In the system control engineering to the isomerization reactor in the PX plant,the parameters of T,P,L and Q are automatic measured and controlled.From that,the ratio of the hydrogen and oil can be increased,the quality and output of the production can be enhanced so that to achieve the goal of boosting the productivity and reduce the energy consumption.
The development to the radial reactor is very important not only to the reactor domestic manufacturers but also to the process reactors development and engineering enlarged .
This design is the engineering of the instrumentation system to the reactor in PX Plant in which there are 4 single loop control, 2 cascade control and all the controllers and control valves are selected and calculated carefully to the system, the CENTUM control system (produced by YOKOGAWA) will be used .In order to reduce the disturbance to the purity of the materials , it needs to control the Flow, Temperature and Pressure of the reacted materials according to the requirements of the production plan and reasonable reaction and keep the production in steady operation. And pay much more attention to the reactor and adjustment based on the composition of the materials and keep the products in good qualification and protection to the catalysis.
Keywords: Isomerization;Reactor;control system;Distributed Control System