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LPPD, Seon Kim 2009. 9. 16

1. Aspen Simulator Initialization 2. Finding Pinch Points (1-D) 3. Composition Profile (1-D) 4. Geometric Profile interpolation. LPPD, Seon Kim 2009. 9. 16. ASPEN Initialization. ASPEN Simulator Process Design

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LPPD, Seon Kim 2009. 9. 16

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  1. 1. Aspen Simulator Initialization2. Finding Pinch Points (1-D)3. Composition Profile (1-D)4. Geometric Profile interpolation LPPD, Seon Kim 2009. 9. 16

  2. ASPEN Initialization • ASPEN Simulator • Process Design • Initial Input Data : Total Number of Stages, Feed Stage, Reflux Ratio, Distillate Flowrate • Output Data : Product Purity

  3. (2) Heptane (2) Hexane ------------------- Design Description ---------------- Column Number - 1 CASE - 4.2 Component : Pentane/Hexane/Heptane/Octane Feed Composition : 0.25 0.25 0.25 0.25 Constant alpha : 13.99 5.4 2.17 1 Distillate Purity : 0.99 0.0098 0.000191 9e-006 ASPEN PRODUCT : 0.99002 0.0099 5.09e-05 6.05e-07 Bottom Purity : 1e-005 0.33115 0.33439 0.33445 ASPEN PRODUCT : 1.29e-06 0.33110 0.33443 0.33445 Feed Flow Rate : 1 --------------------- RESULT -------------------------- minimum BPD : 2.8909e-005 BPET of Intersect : 10.0132 Reflux Ratio : 7.3645 Reboil Ratio : 2.8257 Distillate Flow : 0.25252 Bottom Flow : 0.74748 Rectifying Tray # : 3.8265 Stripping Tray # : 15.7426 Total Tray # : 19.5692 (4) Octane (1) Hexane (3) Octane (1) Pentane (3) Heptane (2) Heptane (3) Octane (1) Hexane

  4. Comparison : Process design VS Product design Column S1 Column S2 Column C3

  5. Finding Pinch Point • Previous work (4-D search) • Pinch Point Equation • Current Work (1-D Search)

  6. Solving Pinch Point Equations

  7. Composition Profile 1-D search

  8. Cubic Spline Curve • The equation for cubic spline segment equation • Blending function matrix (F) • Position and tangent vector (G) F4 F1 F2 F3 3 segments 1 segment

  9. Bizeir Polygon • Bezier Curve • Blending Functions J 2,0 J 2,2 J 2,1 (a) Three Polygon Points (b) Four Polygon Points (c) Five Polygon Points (d) Six Polygon Points

  10. Ternary Mixture Case 1 : Tangent Vector Magnitude change Case 2 : Number of segment and Tangent Vector Magnitude change

  11. Quaternary Mixture Composition Profile (ODE) Bezier Curve Cubic Spline Curve Tangent Vector Magnitude change

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