Control System Design for Top Pressure Selection of Ammonia Removal Tower in Morpholine Process
In order to control the top pressure of ammonia removal tower in the morpholine process,a control system for selecting the top pressure was designed based on Siemens S7-300 PLC.The top pressure was controlled by condensate flow rate in normal operation.When too much non-condensing gas accumulates in the reflux tank,leading to the pressure regulating function of the condensate fails,the non-condensing gas was discharged through the venting control loop,and then the pressure regulating ability of the condensate was restored.The off-line simulation test showed that after putting in automatic control,the control program can satisfy the predetermined control requirements and switch the controller according to the limited parameter conditions.It has a good reference significance for the actual engineering transformation on the spot.
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