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Distillation-Column-Simulation

Distillation-Column-Simulation - COLUMN SPECIFICATION AND...

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COLUMN: SPECIFICATION AND VARIABLES Consider a column with N T trays N C components EQUATIONS: 1) Steady state mass balances for all components in all trays L j-1 x j-1,i -[(L j +LD j )x j,i +(V j +VD j )y j,i ]+V j+1 y j+1,i +F j z i =0 i=1,. .,N C j=1,. .., N T L= Liquid rates V= Vapor rates LD= Liquid Draw rates VD= Vapor Draw rates x= liquid compositions y=vapor compositions z= feed composition 2) Equilibrium Relations y j,i =K j,i, (x j , T j , P j )x j,i i=1,. .,N C j=1,. .., N T 3) Summation equations x i N C = 1 j,i = 1 j=1,. .., N T y i N C = 1 j,i = 1 j=1,. .., N T 3) Enthalpy balance in each tray L j-1 h j-1 -[(L j +LD j )h j +(V j +VD j )H j ]+V j+1 H j+1 +F j H F =0 j=1,. .., N T h: liquid enthalpy H: Vapor enthalpy H F : Enthalpy of feed Total number of equations : N T (3+2N C )
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VARIABLES 1) For each tray (excluding condenser and reboiler): T j , L j , V j , x j,i , y j,i Variables= 3( N T -2) + 2 (N T -2)(2 N C ) 2) For the condenser (temperature, flows, compositions and duty)
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Distillation-Column-Simulation - COLUMN SPECIFICATION AND...

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