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Modelling of flashing stage internals for a multistage flash desalination

Abidin, Muhammad (2016) Modelling of flashing stage internals for a multistage flash desalination. Honours thesis, Murdoch University.

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Natural water resources have become a global crisis, which most countries in the world try to overcome this problem in many ways. As the population of human is increasing, the development of industries and demand of water on agriculture sector have boosted up this water shortage problems to the critical zone. Over the decades, desalination technology has become the most effective alternative way to supply fresh water throughout the world. The multistage flash desalination and reverse osmosis processes are examples of desalination technology that is available in the market nowadays. [James E. Miller, 2003]

Desalination is basically a process of separation between salt and water. Water that has been desalinated must be salt free to be considered as a successful product for human consumption. This thesis is basically a report on the efficiency of the mathematical model of the multistage flash desalination with recirculating brine that was developed by Hisham T.El-Dessouky & Hisham M.Ettouney, (2002). The evaluation of the modelling equation is done by simulating the model inside the Aspen Custom Modeler. [James E. Miller, 2003]

The literature review of desalination has covered the importance of desalination and the available desalination technologies. Desalination is the most demanded technology in supplying fresh water. The desalination process is divided into two types, which are membrane technique and thermal technique. Every process that falls under those two techniques is explained in details. The process operations for each of the processes are provided so that the differences between processes can be seen and understood. [James E. Miller, 2003]

Then, the development of the mathematical equations of the system are introduced. The list of equation that have been used in this thesis is given and assumptions while developing those equations are discussed. Important operational variables have been highlighted to show that these variables play an important role in making the process more effective. Effectiveness of variables are been tested on the effect of value changes to the process.

The method that been used was by testing the model of the system in the Aspen Custom Modeler software. The evaluation of the system effectiveness was by study the effect of the number of stages against the performance ratio of the system. As the number of stages increases the performance ratio of the system also increased. Another important variable is top brine temperature, it gave same effect to the system performance as its value increasing. The information gained from the study is the existence of demister will affect the vapour velocity of the system.

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