CHNG3802: Process Dynamics and Control - Report Writing Engineering Assignment Help

Assignment Task:

Q1) Distillation column in LoopPro:   

The distillation process in LoopPro is a non-linear 2-input 2-output system with significant interaction.
a) Define clearly the control objectives

b) Classify all the process variables from a control point of view

c) Review ‘control structure’ of distillation columns. Here you want to show off your research skills to review and remark on the rich history of literature in controlling distillation columns; use resources such as process control textbooks and journal papers to do this. A good literature review here would summarise key references into a concise literature table. Think and plan how you would do that considering, brevity, clarity and meaningfulness. 

Q2) For the distillation column process:

Designing a good control scheme for the distillation column requires good understanding of the process dynamics and interactions. You are therefore first required to carry out dynamic modelling analysis before implementing any control design: 
a) Draw a block diagram of the open-loop input-output system.

b) Develop FOPDT models for the input-output relationships, including for disturbance inputs. 

c) Following on from Q1c, and considering SISO feed-back control configuration for set-point tracking of the top and bottom compositions, the task now is to draw a block diagram of the closed-loop system.

d) Draw a detailed process and instrumentation diagram (P&ID) of the column. Here you want to show off your technical drawing skills for Process and Instrumentation Diagrams (P&IDs). Use a package such as Visio to do this and refer to relevant references and supplementary materials on Canvas and in the literature. Review previous professional examples of P&IDs. Remember your skills in drawing P&IDs will become of use in later courses such as Fourth Year Design, and for some during your engineering career.   

Q3) Stability analysis:   

Your team has observed a disturbance in the upstream feed line entering the column. To counteract this, you decide to install a heat exchanger in the feed line to control the temperature (Y) entering the column using a cooling flow (U). The dynamics of this heat exchanger are captured by the following transfer function model:
G(s) = 3/(6s²+5s+4)

a) Analyse the heat exchanger transfer function:
(i) Determine the poles of this function
(ii) Plot the poles on the complex plane
(iii) Based on the pole locations, describe the general dynamic behaviour of this heat exchanger process. 

Q4) Dynamics of the distillation column:   

a) Use the LoopPro Multi-loop Custom Process to implement the FOPDT models of the Distillation column developed in Q2b, then perform step tests in the inputs to explore process interactions. Discuss your observations and findings with the aid of process reaction plots.

b) Implement the distillation column model in Simulink, and demonstrate it works with the aid of process reaction plots.

c) Use your distillation Simulink model developed in Q4b to now implement the SISO feedback control scheme conceptualised in Q2c. (Hint: use the autotune function to test the workings of the SISO controllers). Demonstrate that the control of the column top composition works for step changes in both for setpoint and disturbance.

d) Carry out an analysis to demonstrate you grasp a good understanding of the role and effect of different PID controller types (Proportional, Integral and Derivative) on the closed-loop process response. (Hint: carry out a sensitivity analysis for changes in PID controller parameters. It is sufficient to use one SISO controller here to demonstrate this, e.g. the top composition controller). 

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