Regarding the installation of multi-effect evaporation flash tanks
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I am conducting simulations on multi-effect evaporation for seawater desalination. During the module setup, should the flash tank flash2 undergo adiabatic flashing (heat duty=0) or isothermal flashing? Thank you everyone
It doesn’t matter how it’s configured; the key is to understand why such a setup is used. For example, in adiabatic flashing, no heat is introduced, so flash vaporization can only occur by reducing pressure. If the pressure remains unchanged, then a heat exchanger must be installed before the flash tank, as heat exchange is necessary for achieving balanced separation. Isothermal flashing means that you fix a certain temperature to carry out the separation process. How to maintain isothermality? Then you need to input the calories, and Aspen calculates these calories for you. So, how to configure it depends on your requirements: if you want to know how much heat needs to be added and what level of separation can be achieved, then choose a heat exchanger + adiabatic flash; if you want to know how much heat is required for flashing at a certain temperature, then choose isothermal flashing.