Changeset 848 for trunk


Ignore:
Timestamp:
Oct 3, 2009, 7:15:28 PM (13 years ago)
Author:
Rafael de Pelegrini Soares
Message:

Improved packed column models

Location:
trunk
Files:
1 added
1 deleted
3 edited

Legend:

Unmodified
Added
Removed
  • trunk/eml/stage_separators/column.mso

    r511 r848  
    13081308       
    13091309        EQUATIONS
    1310         stage.deltaP = dP/NStages;
     1310        #stage.deltaP = dP/NStages;
     1311        dP = stage(bot).OutletL.P - stage(top).OutletL.P;
    13111312       
    13121313        CONNECTIONS
     
    13521353";
    13531354       
    1354         PARAMETERS
    1355         VapourFlow as Switcher(Valid = ["on", "off"], Default = "on");
    1356        
    13571355        VARIABLES
    13581356        cond as condenser;
     
    13731371       
    13741372        EQUATIONS
    1375         switch VapourFlow
    1376                 case "on":
    1377                 stage(bot).InletV.F*stage(bot).vV = sqrt((reb.OutletV.P - stage(bot).OutletV.P)/
    1378                                         (stage(bot).rhoV*stage(bot).Qsil*20))*(stage(bot).d^2*3.14159/4*stage(bot).e - stage(bot).Al);
    1379                 when stage(bot).InletV.F < 1e-6 * 'kmol/h' switchto "off";
    1380                
    1381                 case "off":
    1382                 stage(bot).InletV.F = 0 * 'mol/s';
    1383                 when reb.OutletV.P > stage(bot).OutletV.P + 1e-1 * 'atm' switchto "on";
    1384         end
    1385 
    1386 end
     1373        stage(top).InletV.F = stage(top).OutletV.F + stage(top).Inlet.F*stage(top).Inlet.v;
     1374
     1375end
  • trunk/eml/stage_separators/tray.mso

    r706 r848  
    405405outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
    406406outer NComp as Integer;
    407         PPwater as Plugin(Brief="Physical Properties",
    408                 Type="PP",
    409                 Components = [ "water" ],
    410                 LiquidModel = "PR",
    411                 VapourModel = "PR"
    412         );
    413407
    414408        V as volume(Brief="Total Volume of the tray");
     
    419413        g as acceleration;
    420414        e as Real (Brief="Void fraction of packing, m^3/m^3");
    421         Cpo as Real (Brief="Constant for resitance equation"); # Billet and Schultes, 1999.
    422415        Mw(NComp)       as molweight    (Brief = "Component Mol Weight");
    423416        hs as length (Brief="Height of the packing stage");
    424         Qsil as positive (Brief="Resistance coefficient on the liquid load", Default=1);
     417        Qsil as positive (Brief="Resistance coefficient on the liquid load", Default=0.6);
     418
     419        VapourFlow as Switcher(Valid = ["on", "off"], Default = "on");
    425420
    426421        VARIABLES
     
    439434       
    440435        miL as viscosity (Brief="Liquid dynamic viscosity", DisplayUnit='kg/m/s');
    441         miV as viscosity (Brief="Vapor dynamic viscosity", DisplayUnit='kg/m/s');
    442436        rhoL as dens_mass;
    443437        rhoV as dens_mass;
    444438       
    445         deltaP as pressure;
    446        
    447         uL as velocity (Brief="volume flow rate of liquid, m^3/m^2/s", Lower=-10, Upper=100);
    448         uV as velocity (Brief="volume flow rate of vapor, m^3/m^2/s", Lower=-10, Upper=100);
    449         dp as length (Brief="Particle diameter", Default=1e-3, Lower=0, Upper=10);
    450         invK as positive (Brief="Wall factor", Default=1, Upper=10);
    451         Rev as Real (Brief="Reynolds number of the vapor stream", Default=4000);
    452         Al as area (Brief="Area occupied by the liquid", Default=0.001, Upper=1);
    453         hl as positive (Brief="Column holdup", Unit='m^3/m^3', Default=0.01,Upper=10);
    454 
     439        deltaP as pressure(Lower=-10);
     440       
     441        uL as velocity (Brief="volume flow rate of liquid, m^3/m^2/s", Lower=0, Upper=100);
     442        uV as velocity (Brief="volume flow rate of vapor, m^3/m^2/s", Lower=0, Upper=100);
     443        Al as area (Brief="Area occupied by the liquid", Default=0.001, Upper=10);
     444        hl as positive (Brief="Column holdup", Unit='m^3/m^3', Default=0.04,Upper=1);
     445       
    455446        SET
    456447        Mw = PP.MolecularWeight();
     
    473464        "Mol fraction normalisation"
    474465        sum(OutletL.z)= 1.0;
    475        
     466        sum(OutletL.z)=sum(OutletV.z);
     467
    476468        "Liquid Volume"
    477469        vL = PP.LiquidVolume(OutletL.T, OutletL.P, OutletL.z);
     
    498490        "Liquid viscosity"
    499491        miL = PP.LiquidViscosity(OutletL.T, OutletL.P, OutletL.z);
    500         "Vapour viscosity"
    501         miV = PP.VapourViscosity(InletV.T, InletV.P, InletV.z);
    502492
    503493        "Area occupied by the liquid"
     
    507497        uL * Al = OutletL.F * vL;
    508498        "Volume flow rate of vapor, m^3/m^2/s"
    509         uV * ((d^2*3.14159/4)*e - Al) = OutletV.F * vV;
     499        uV * (V*e/hs - Al) = InletV.F * vV;
    510500       
    511501        "Liquid holdup"
    512         hl = ML*vL/V/e;
    513        
    514         "Particle diameter"
    515         dp = 6 * (1-e)/a;
    516        
    517         "Wall Factor"
    518         invK = (1 + (2*dp/(3*d*(1-e))));
    519        
    520         "Reynolds number of the vapor stream"
    521         Rev*invK = dp*uV*rhoV / (miV*(1-e));
    522        
     502        hl*V*e = ML*vL;
     503       
     504        "Liquid velocity as a function of liquid holdup, Billet (4-27)"
     505        hl^3 = (12/g) * a^2 * (miL/rhoL) * uL;
     506       
     507        switch VapourFlow
     508                case "on":
     509                "Pressure drop and Vapor flow, Billet (4-58)"
     510                deltaP/hs  = Qsil * (a/2 + 2/d) * 1/((e-hl)^3) * (uV^2) * rhoV;
     511               
     512                when InletV.F < 1e-6 * 'kmol/h' switchto "off";
     513               
     514                case "off":
     515                InletV.F = 0 * 'mol/s';
     516                when deltaP > 1e-4 * 'atm' switchto "on";
     517        end
     518
     519        "Pressure profile"
    523520        deltaP = InletV.P - OutletV.P;
    524        
    525         "Pressure drop and Vapor flow"
    526         deltaP/hs  = Qsil*a*uV^2*rhoV*invK / (2*(e-hl)^3);
    527 
    528         "Liquid holdup"
    529         hl = (12*miL*a^2*uL/rhoL/g)^1/3;
    530521end
    531522
  • trunk/sample/stage_separators/sample_column.mso

    r650 r848  
    505505end
    506506
    507 # packed column section with 8 trays
    508 FlowSheet PackedSectionColumn
    509         PARAMETERS
    510         PP      as Plugin(Brief="Physical Properties",
    511                 Type="PP",
    512                 Components = [ "isobutane", "n-pentane", "propylene",
    513                 "benzene", "isobutene" ],
    514                 LiquidModel = "PR",
    515                 VapourModel = "PR"
    516         );
    517         NComp   as Integer;
    518 
    519         SET
    520         NComp = PP.NumberOfComponents;
    521        
    522         DEVICES
    523         sec as Packed_Section_Column;
    524         feed as liquid_stream;
    525         reb as vapour_stream;
    526         cond as liquid_stream;
    527         zero as stream;
    528        
    529         CONNECTIONS
    530         feed to sec.stage(5).Inlet;
    531         zero to sec.stage([1:4]).Inlet;
    532         zero to sec.stage([6:sec.NStages]).Inlet;
    533         reb to sec.stage(8).InletV;
    534         cond to sec.stage(1).InletL;
    535        
    536         SPECIFY
    537         feed.F = 113.4 * 'kmol/h';
    538         feed.T = 291 * 'K';
    539         feed.P = 1.66 * 'atm';
    540         feed.z = [0.2, 0.2, 0.2, 0.2, 0.2];
    541 
    542         zero.F = 0 * 'kmol/h';
    543         zero.T = 300 * 'K';
    544         zero.P = 1 * 'atm';
    545         zero.z = [0.2, 0.2, 0.2, 0.2, 0.2];
    546         zero.v = 0;
    547         zero.h = 0 * 'J/mol';
    548        
    549         cond.F = 85 * 'kmol/h';
    550         cond.P = 2.33 * 'atm';
    551         cond.T = 283.5 * 'K';
    552         cond.z = [0.599, 0.044, 0.035, 0.007, 0.315];
    553 
    554         reb.F = 137.57 * 'kmol/h';
    555         reb.P = 2.46 * 'atm';
    556         reb.T = 325 * 'K';
    557         reb.z = [0.16, 0.542, 0.013, 0.008, 0.277];
    558 
    559         sec.dP = 0.008 * 'atm'; #queda de pressao na secao!
    560 
    561         SET
    562         sec.H = 4 * 'm';#altura do recheio
    563         sec.NStages = 8; #numero de estagios teoricos do recheio
    564         sec.stage.Q = 0 * 'kW';
    565         sec.stage.d = 1.009 * 'm';
    566         sec.stage.Cpo = 0.763;
    567         sec.stage.e = 0.951;
    568         sec.stage.a = 112.6 * 'm^2/m^3';
    569         sec.stage.Qsil = 0.1;#coeficiente de resistencia do recheio
    570 
    571         INITIAL
    572         sec.stage.OutletL.T =[283:(325-283)/(sec.NStages-1):325] *'K';
    573         sec.stage.ML = 0.01 * 'kmol';
    574         sec.stage.OutletL.z([1:4]) = [0.3, 0.2, 0.002, 0.1];
    575 
    576         OPTIONS
    577         DAESolver(File="dassl");
    578         NLASolver(File="nlasolver");
    579         TimeStep = 10;
    580         TimeEnd = 100;
    581 end
    582 
    583 FlowSheet Packed_kettle_cond_Test
    584         PARAMETERS
    585         PP      as Plugin(Brief="Physical Properties",
    586                 Type="PP",
    587                 Components = [ "isobutane", "n-pentane", "propylene",
    588                 "benzene", "isobutene" ],
    589                 LiquidModel = "PR",
    590                 VapourModel = "PR"
    591         );
    592         NComp   as Integer;
    593        
    594         VARIABLES
    595         Qc as energy_source (Brief="Heat rate removed from condenser");
    596         Qr as energy_source (Brief="Heat rate supplied to reboiler");
    597        
    598         SET
    599         NComp = PP.NumberOfComponents;
    600 
    601         DEVICES
    602         col as PackedDistillation_kettle_cond;
    603         feed as source;
    604         zero as stream;
    605        
    606         CONNECTIONS
    607         feed.Outlet to col.stage(5).Inlet;
    608         zero to col.reb.Inlet;
    609         zero to col.stage([1:4]).Inlet;
    610         zero to col.stage([6:col.NStages]).Inlet;
    611         Qc.OutletQ to col.cond.InletQ;
    612         Qr.OutletQ to col.reb.InletQ;
    613        
    614         SPECIFY
    615         feed.F = 113.4 * 'kmol/h';
    616         feed.T = 291 * 'K';
    617         feed.P = 168.3 * 'kPa';
    618         feed.Composition = 1/NComp;
    619        
    620         zero.F = 0 * 'kmol/h';
    621         zero.T = 300 * 'K';
    622         zero.P = 1 * 'atm';
    623         zero.z = 1/NComp;
    624         zero.v = 0;
    625         zero.h = 0 * 'J/mol';
    626        
    627         col.sptop.Outlet2.F = 85 * 'kmol/h';
    628         col.reb.OutletL.F = 28.4 * 'kmol/h';
    629         col.sptop.frac = 0.444445;
    630         col.cond.OutletV.F = 0 * 'kmol/h';
    631         Qr.OutletQ.Q = 3.7743e6 * 'kJ/h';
    632         Qc.OutletQ.Q = -3.71e6 * 'kJ/h';
    633         col.pump1.dP = 16 * 'kPa';
    634 
    635         col.dP = 0.024 * 'atm'; #queda de pressao entre o topo e o fundo da coluna.
    636 
    637         SET
    638         col.H = 3.5 * 'm'; # altura de recheio
    639         col.NStages = 8; # numero de estagios teoricos do recheio
    640         col.stage.Q = 0 * 'kW';
    641         col.stage.d = 2.24 * 'ft';
    642         col.stage.Cpo = 0.763;
    643         col.stage.e = 0.951;
    644         col.stage.a = 112.6 * 'm^2/m^3';
    645 
    646         col.cond.V = 2 * 'm^3';
    647         col.cond.Across = 1 * 'm^2';
    648         col.reb.V = 2 * 'm^3';
    649         col.reb.Across = 1 * 'm^2';
    650         col.stage.Qsil = 2; # coeficiente de resistencia do recheio
    651        
    652         INITIAL
    653         # condenser
    654         col.cond.OutletL.T = 260 *'K';
    655         col.cond.Level = 1 * 'm';
    656         col.cond.OutletL.z([1:4]) = [0.65, 0.05, 0.01, 0.01];
    657 
    658         # reboiler
    659         col.reb.OutletL.T = 330 *'K';
    660         col.reb.Level = 1 * 'm';
    661         col.reb.OutletL.z([1:4]) = [0.1, 0.7, 0.01, 0.01];
    662 
    663         # column trays
    664         col.stage.OutletL.T = [290:(330-290)/(col.NStages-1):330] * 'K';
    665         col.stage.ML = 0.1 * 'kmol';
    666         col.stage.OutletL.z([1:4]) = [0.15, 0.5, 0.001, 0.1];
    667 
    668         OPTIONS
    669         TimeStep = 10;
    670         TimeEnd = 500;
    671 end
    672 
    673 FlowSheet PackedColumn_ctrl
    674         PARAMETERS
    675         PP      as Plugin(Brief="Physical Properties",
    676                 Type="PP",
    677                 Components = [ "isobutane", "n-pentane", "propylene",
    678                         "benzene", "isobutene" ],
    679                 LiquidModel = "PR",
    680                 VapourModel = "PR"
    681         );
    682         NComp   as Integer;
    683        
    684         Qcmin as heat_rate (Brief="Minimum Condenser Heat supplied");
    685         Qcmax as heat_rate (Brief="Maximum Condenser Heat supplied");
    686         Qrmin as heat_rate (Brief="Minimum Reboiler Heat supplied");
    687         Qrmax as heat_rate (Brief="Maximum Reboiler Heat supplied");
    688         Frmin as flow_mol (Brief="Minimum bottom flow rate");
    689         Frmax as flow_mol (Brief="Maximum bottom flow rate");
    690         Fcmin as flow_mol (Brief="Minimum reflux flow rate");
    691         Fcmax as flow_mol (Brief="Maximum reflux flow rate");
    692         Hmint as length (Brief="Minimum liquid level in top tank");
    693         Hmaxt as length (Brief="Maximum liquid level in top tank");
    694     Hminb as length (Brief="Minimum liquid level in reboiler");
    695         Hmaxb as length (Brief="Maximum liquid level in reboiler");
    696         Pmax as pressure (Brief="Maximum column pressure");
    697         Pmin as pressure (Brief="Minimum column pressure");
    698         Tmax as temperature (Brief="Maximum column temperature");
    699         Tmin as temperature (Brief="Minimum column temperature");
    700 
    701         VARIABLES
    702         Qc as energy_source (Brief="Heat rate removed from condenser");
    703         Qr as energy_source (Brief="Heat rate supplied to reboiler");
    704         Had_top as Real (Brief="Dimensionless condenser level");
    705         Had_bot as Real (Brief="Dimensionless reboiler level");
    706         Pad as Real (Brief="Dimensionless pressure");
    707         Tad as Real (Brief="Dimensionless temperature");
    708         RR      as positive (Brief="Reflux ratio");
    709 
    710         SET
    711         NComp = PP.NumberOfComponents;
    712 
    713         DEVICES
    714         col as PackedDistillation_kettle_cond;
    715         feed as source;
    716         zero as stream;
    717         TCcond as PIDIncr;
    718         LCtop as PIDIncr;
    719         LCbot as PIDIncr;
    720         PC as PIDIncr;
    721 
    722         CONNECTIONS
    723         feed.Outlet to col.stage(5).Inlet;
    724         zero to col.reb.Inlet;
    725         zero to col.stage([1:4]).Inlet;
    726         zero to col.stage([6:col.NStages]).Inlet;
    727         Qc.OutletQ to col.cond.InletQ;
    728         Qr.OutletQ to col.reb.InletQ;
    729 
    730         EQUATIONS
    731    "Temperature Controller"
    732         TCcond.Parameters.tau = 0*'s'; 
    733         TCcond.Parameters.tauSet = 0*'s';       
    734         TCcond.Parameters.alpha = 0.3;
    735         TCcond.Parameters.bias = 0.5;   
    736         TCcond.Parameters.gamma = 1;
    737         TCcond.Parameters.beta = 1;
    738         TCcond.Options.action = 1;
    739         TCcond.Options.clip = 1;
    740         TCcond.Options.autoMan = 0;
    741         TCcond.Parameters.intTime = 60*'s';
    742         TCcond.Parameters.gain = 0.6;
    743         TCcond.Parameters.derivTime = 1*'s';
    744         TCcond.Ports.setPoint = ((15+273.15) * 'K' - Tmin)/(Tmax-Tmin);
    745         TCcond.Ports.input = Tad;
    746         Tad = (col.cond.OutletL.T-Tmin)/(Tmax-Tmin);
    747         Qc.OutletQ.Q = Qcmin+(Qcmax-Qcmin)*TCcond.Ports.output;
    748 
    749         "Pressure Controller"
    750         PC.Parameters.tau = 0*'s';     
    751         PC.Parameters.tauSet = 0*'s';   
    752         PC.Parameters.alpha = 0.3;
    753         PC.Parameters.bias = 0;
    754         PC.Parameters.gamma = 1;
    755         PC.Parameters.beta = 1;
    756         PC.Options.action = -1;
    757         PC.Options.clip = 1;
    758         PC.Options.autoMan = 0;
    759         PC.Parameters.intTime = 50*'s';
    760         PC.Parameters.gain = 0.5;
    761         PC.Parameters.derivTime = 1*'s';
    762         PC.Ports.setPoint = (4.0*'bar'-Pmin)/(Pmax-Pmin);
    763         PC.Ports.input = Pad;
    764         Pad = (col.cond.OutletV.P-Pmin)/(Pmax-Pmin);
    765         col.cond.OutletV.F = (Fcmin+(Fcmax-Fcmin)*PC.Ports.output);     
    766        
    767         "Ttop Level Controller"
    768         LCtop.Parameters.tau = 0*'s';   
    769         LCtop.Parameters.tauSet = 0*'s';       
    770         LCtop.Parameters.alpha = 0.3;
    771         LCtop.Parameters.bias = 0.5;   
    772         LCtop.Parameters.gamma = 1;
    773         LCtop.Parameters.beta = 1;
    774         LCtop.Options.action = -1;
    775         LCtop.Options.clip = 1;
    776         LCtop.Options.autoMan = 0;
    777         LCtop.Parameters.intTime = 10*'s';
    778         LCtop.Parameters.gain = 1;
    779         LCtop.Parameters.derivTime = 0*'s';
    780         LCtop.Ports.setPoint = (1.0 * 'm' - Hmint)/(Hmaxt-Hmint);
    781         LCtop.Ports.input = Had_top;
    782         Had_top = (col.cond.Level-Hmint)/(Hmaxt-Hmint);
    783         col.sptop.Outlet1.F = Fcmin + (Fcmax-Fcmin) * LCtop.Ports.output;
    784 
    785         "Tbottom Level Controller"
    786         LCbot.Parameters.tau = 0*'s';   
    787         LCbot.Parameters.tauSet = 0*'s';       
    788         LCbot.Parameters.alpha = 0.3;
    789         LCbot.Parameters.bias = 0.5;   
    790         LCbot.Parameters.gamma = 1;
    791         LCbot.Parameters.beta = 1;
    792         LCbot.Options.action = -1;
    793         LCbot.Options.clip = 1;
    794         LCbot.Options.autoMan = 0;
    795         LCbot.Parameters.intTime = 100*'s';
    796         LCbot.Parameters.gain = 1;
    797         LCbot.Parameters.derivTime = 0*'s';
    798         LCbot.Ports.setPoint = (1.0 * 'm' - Hminb)/(Hmaxb-Hminb);
    799         LCbot.Ports.input = Had_bot;
    800         Had_bot = (col.reb.Level-Hminb)/(Hmaxb-Hminb);
    801         col.reb.OutletL.F = Frmin + (Frmax-Frmin) * LCbot.Ports.output;
    802 
    803         RR * (col.cond.OutletV.F + col.sptop.Outlet1.F) = col.sptop.Outlet2.F;
    804        
    805         if time < 1 * 'h' then
    806                 col.sptop.Outlet2.F = 75 * 'kmol/h'; # reflux
    807         else
    808                 col.sptop.Outlet2.F = 85 * 'kmol/h'; # reflux
    809         end
    810 
    811         SPECIFY
    812         feed.F = 113.4 * 'kmol/h';
    813         feed.T = 291 * 'K';
    814         feed.P = 5 * 'bar';
    815         feed.Composition = 1/NComp;
    816        
    817         zero.F = 0 * 'kmol/h';
    818         zero.T = 300 * 'K';
    819         zero.P = 1 * 'atm';
    820         zero.z = 1/NComp;
    821         zero.v = 0;
    822         zero.h = 0 * 'J/mol';
    823        
    824         Qr.OutletQ.Q = 4e6 * 'kJ/h';
    825         col.pump1.dP = 16 * 'kPa';
    826        
    827         col.dP = 0.024  * 'atm'; #queda de pressao entre o topo e o fundo da coluna
    828 
    829         SET
    830         col.H = 3.5 * 'm'; #altura do recheio
    831         col.NStages = 8; #numero de estagios teoricos do recheio
    832         col.stage.Q = 0 * 'kW';
    833         col.stage.d = 2.24 * 'ft';
    834         col.stage.Cpo = 0.763;
    835         col.stage.e = 0.951;
    836         col.stage.a = 112.6 * 'm^2/m^3';
    837 
    838         col.cond.V = 2 * 'm^3';
    839         col.cond.Across = 1 * 'm^2';
    840         col.reb.V = 2 * 'm^3';
    841         col.reb.Across = 1 * 'm^2';
    842 
    843         col.stage.Qsil = 2; #coeficiente de resistencia do recheio
    844 
    845         # Controllers type
    846         TCcond.PID_Select = "Ideal_AW";
    847         PC.PID_Select = "Ideal_AW";
    848         LCtop.PID_Select = "Ideal_AW";
    849         LCbot.PID_Select = "Ideal_AW";
    850 
    851         Qrmax = 5e6 * 'kJ/h';
    852         Qrmin = 1e6 * 'kJ/h';
    853         Frmin = 0 * 'kmol/h';
    854         Frmax = 60 * 'kmol/h';
    855         Fcmin = 0 * 'kmol/h';
    856         Fcmax = 120 * 'kmol/h';
    857         Hmint = 0 * 'm';
    858         Hmaxt = 2 * 'm';
    859         Hminb = 0 * 'm';
    860         Hmaxb = 2 * 'm';
    861         Pmin = 0.5 * 'bar';
    862         Pmax = 6 * 'bar';
    863         Qcmax = -5e5 * 'kJ/h';
    864         Qcmin = -5e6 * 'kJ/h';
    865         Tmax = (30+273.15) * 'K';
    866         Tmin = (-20+273.15) * 'K';
    867        
    868         INITIAL
    869         # condenser
    870         col.cond.OutletL.T = 260 *'K';
    871         col.cond.Level = 1 * 'm';
    872         col.cond.OutletL.z([1:4]) = [0.2, 0.2, 0.4, 0.05];
    873 
    874         # reboiler
    875         col.reb.OutletL.T = 350 *'K';
    876         col.reb.Level = 1 * 'm';
    877         col.reb.OutletL.z([1:4]) = [0.1, 0.4, 0.1, 0.3];
    878 
    879         # column trays
    880         col.stage.OutletL.T = [290:(330-290)/(col.NStages-1):330] * 'K';
    881         col.stage.ML = 0.1 * 'kmol';
    882         col.stage.OutletL.z([1:4]) = [0.15, 0.3, 0.25, 0.2];
    883 
    884         OPTIONS
    885         TimeStep = 0.1;
    886         TimeEnd = 5;
    887         TimeUnit = 'h';
    888         InitialFile = "Packed_Column_ctrl.rlt";
    889         #GuessFile = "Packed_Column_ctrl.rlt";
    890         #Dynamic = false;
    891         DAESolver(File="dassl");
    892 end
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