Dynamic column model also requirements to consider downcomer dynamics so that you can correctlyChemEngineering 2021, five,four ofChemEngineering 2021, five,Due to the fact we choose to simulate the start-up not merely of a single segment or even a normal 4 of develcolumn, but additionally of extra segments which might be connected by means of the downcomer, the17 oped dynamic column model also desires to think about downcomer dynamics in order to properly predict downcomer backup throughout start-up. This connection involving each and every downcomer on each and every tray, which is accounted for connection betweenmajordowncomer from predict downcomer backup for the duration of start-up. This inside the model, is usually a each distinction typical column models. On account of the fact that liquid is important difference from regular on every single tray, that is accounted for inside the model, is actually a supposed to flow from a single downcolumn models. Due one, reality that liquid is supposed to flow from one particular downcomer to appropriate comer to the adjacent for the flow equations have to be created that predict thethe adjacent the liquid in the have to be developed that every the right tray. On top of that, behavior ofone, flow equations downcomer, but also onpredictconnected behavior of the theliquidbalance should be viewed as for each and every downcomer, since the effects ofbalance the heat in the downcomer, but in addition on each connected tray. Furthermore, the heat heating has to be regarded as for every single downcomer, since the effects of heating the adjacent segment adjacent segment by the side stream must be accounted for. by the side stream must be accounted for. The model was implemented in Aspen Custom Modelerand the the properties for the in Aspen Custom Modelerand properties for the The model was implemented components had been retrieved from an Aspen Propertiessubroutine. ForFor a superior undercomponents have been retrieved from an Aspen Properties subroutine. a far better understanding, a tray inin Diloxanide medchemexpress thesegmented distillation column is is depicted Figure two. The tray is standing, a tray the segmented distillation column depicted in in Figure two. The tray is Cymoxanil Anti-infection divided into separate handle volumesfor the equilibrium stage and the the downcomer. divided into separate control volumes for the equilibrium stage and downcomer.Distillate -1 , ,-1 , -i, , ,-1 , ,-1 , -iDowncomer jStage j,, , ,Feedi ,,,i,i , , ,,Bottom solution, ,+1 , +1 +, , ,i, , ,iFigure 2. Schematic representation of a tray Figure two. Schematic representation of a tray inin the segmented column,divided into downcomer andand equilibrium stage. the segmented column, divided into downcomer equilibrium stage.Within the following, the equations for the equilibrium stage and also the downcomer of every single In are described. the equations for for equilibrium downcomer for the equilibrium stagethe following, Then, the method theconnecting thestage plus the downcomer of each stage are described. Then, the column is presented. stage and also the segment from the strategy for connecting the downcomer to the equilibriumstage along with the segment on the column is presented.2.1. Equilibrium Stage The MESH equations for the equilibrium stage are presented below. Index i indicates two.1. Equilibrium StageThe MESH equations for the equilibrium stage are presented below. Index i indicates the components and index j indicates the theoretical stage. liq vapd HUj xi,j + HUj yi,j liq dt vap ( , + , ) weep tostage dc feed z + L = Fj xi,j + Vj+1 yi,j+1 – Ldc xi,j i,j j j-1 xi,j-1 + L j weep todc x weep V y tostage dc xi,j – – L j = feed L j + i,j – j i,j + , + ,+1 – , +1 -1 ,-1 weep todc ,.
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