6.2   Order of the transfer function  

             The order of the transfer function is first order.

 

 6.3  Control variables, Manipulated variable(s), Disturbance variable(s)         for the reactor  

 

 

 

 

 

 

 

 

 

 

 

6.4 Control Algorithm

 

A proportional-integral-derivative controller (PID controller) is used in this reactor. 

 

A summary of the PID Controller :

Proportional   : reacts to deviation in CV, not concern about the time

Integral          : corrective action depends on the duration of the deviation

Derivative       : rate of change of error, amplifies sudden changes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

From the graph, we can see that Proportional controller reduce the offset. 

 

 

 No control

 New steady state is reached

 P control    

 Offset reduced

 PI control  

 Offset eliminated, Oscillatory response

 PID control

 Oscillations reduced, No offset