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Modelling and optimizing single and multiple effect evaporators using Aspen Custom Modeler (ACM)

Ramli, Aida Liyana Binti (2016) Modelling and optimizing single and multiple effect evaporators using Aspen Custom Modeler (ACM). Honours thesis, Murdoch University.

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The Modelling and Optimizing Single and Multiple Effect Evaporators Using Aspen Custom Modeler (ACM) are carried out to understand the developed model equations written for a double effect evaporator and be able to develop similar programs for both single effect and multiple effect evaporators. The case study was taken from the examples provided by Aspen Customer Modeller (ACM), a part of ASPEN software package.

The case study involves the double effect evaporator used to concentrate glycol from a dilute aqueous solution of 3.5 w% of glycol. The steady state model with the cost model to operate the double effect evaporator was obtained from ACM. These models were tested by performing steady and optimization simulations in MATLAB and ACM software.

To perform the simulation for single and multiple effect evaporator systems, a deeper understanding of process model is essentially required before applying the process model in MATLAB and ACM. A study on the process model was carried out using Excel spreadsheet. The single effect evaporator system is not a complex system investigated compared with the double effect evaporator system. Therefore, the steady state model for a single effect evaporator system was developed first before proceeding with double effect evaporator.

At the same time, sensitivity analysis of the single and multiple effect evaporators were performed and compared. Sensitivity analysis was performed to examine the limitations of process variables such as steam conditions and steam valve coefficients against concentration of product, mass flowrate of liquid, mass flowrate of steam, temperature liquid, and temperature chest.

As for the relationship between mass flowrate of steam against concentration of liquid out of evaporator, the increase in mass flowrate of steam affects the concentration of product. For the second case, sensitivity analysis was carried out to investigate the relationship between steam valve coefficients out of evaporator against concentration of liquid out. For single effect evaporator at the beginning of the process, the concentration of liquid increased then did not change and remained constant after a certain limit. As a conclusion for the result, to operate single effect evaporator, the steam valve coefficient for this process has a limit. For double effect evaporator, the concentration of liquid keep increased against steam valve coefficients out of evaporator.

Overall, most of the main objectives of this thesis were achieved with very satisfying results. However due to unforeseen circumstances and time constraints, optimization was not fully investigated.

Publication Type: Thesis (Honours)
Murdoch Affiliation: School of Engineering and Information Technology
Supervisor: Vu, Linh
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