1 | #*------------------------------------------------------------------- |
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2 | * EMSO Model Library (EML) Copyright (C) 2004 - 2007 ALSOC. |
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3 | * |
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4 | * This LIBRARY is free software; you can distribute it and/or modify |
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5 | * it under the therms of the ALSOC FREE LICENSE as available at |
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6 | * http://www.enq.ufrgs.br/alsoc. |
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7 | * |
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8 | * EMSO Copyright (C) 2004 - 2007 ALSOC, original code |
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9 | * from http://www.rps.eng.br Copyright (C) 2002-2004. |
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10 | * All rights reserved. |
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11 | * |
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12 | * EMSO is distributed under the therms of the ALSOC LICENSE as |
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13 | * available at http://www.enq.ufrgs.br/alsoc. |
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14 | * |
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15 | *------------------------------------------------------------------- |
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16 | * Model of a dynamic condenser |
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17 | *-------------------------------------------------------------------- |
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18 | * |
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19 | * Streams: |
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20 | * * a vapour inlet stream |
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21 | * * a liquid outlet stream |
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22 | * |
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23 | * Assumptions: |
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24 | * * perfect mixing of both phases |
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25 | * * thermodynamics equilibrium |
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26 | * |
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27 | * Specify: |
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28 | * * the Inlet stream |
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29 | * * the Outlet flows |
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30 | * |
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31 | * Initial: |
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32 | * * the condenser temperature (OutletL.T) |
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33 | * * the condenser level (Ll) |
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34 | * * (NoComps - 1) Outlet compositions |
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35 | * |
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36 | *---------------------------------------------------------------------- |
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37 | * Author: Paula B. Staudt |
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38 | * $Id: condenser.mso 72 2006-12-08 18:29:10Z paula $ |
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39 | *--------------------------------------------------------------------*# |
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40 | |
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41 | using "streams"; |
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42 | |
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43 | Model condenser |
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44 | PARAMETERS |
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45 | ext PP as CalcObject; |
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46 | ext NComp as Integer; |
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47 | V as volume (Brief="Condenser total volume"); |
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48 | Across as area (Brief="Cross Section Area of reboiler"); |
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49 | |
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50 | VARIABLES |
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51 | in InletV as stream; #(Brief="Vapour inlet stream"); |
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52 | out OutletL as stream_therm; #(Brief="Liquid outlet stream"); |
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53 | out OutletV as stream_therm; #(Brief="Vapour outlet stream"); |
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54 | in Q as heat_rate (Brief="Heat supplied"); |
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55 | |
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56 | M(NComp) as mol (Brief="Molar Holdup in the tray"); |
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57 | ML as mol (Brief="Molar liquid holdup"); |
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58 | MV as mol (Brief="Molar vapour holdup"); |
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59 | E as energy (Brief="Total Energy Holdup on tray"); |
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60 | vL as volume_mol (Brief="Liquid Molar Volume"); |
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61 | vV as volume_mol (Brief="Vapour Molar volume"); |
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62 | Level as length (Brief="Level of liquid phase"); |
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63 | |
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64 | EQUATIONS |
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65 | "Component Molar Balance" |
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66 | diff(M) = InletV.F*InletV.z - OutletL.F*OutletL.z |
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67 | - OutletV.F*OutletV.z; |
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68 | |
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69 | "Energy Balance" |
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70 | diff(E) = InletV.F*InletV.h - OutletL.F*OutletL.h |
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71 | - OutletV.F*OutletV.h + Q; |
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72 | |
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73 | "Molar Holdup" |
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74 | M = ML*OutletL.z + MV*OutletV.z; |
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75 | |
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76 | "Energy Holdup" |
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77 | E = ML*OutletL.h + MV*OutletV.h - OutletV.P*V; |
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78 | |
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79 | "Mol fraction normalisation" |
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80 | sum(OutletL.z)=1.0; |
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81 | sum(OutletL.z)=sum(OutletV.z); |
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82 | |
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83 | "Liquid Volume" |
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84 | vL = PP.LiquidVolume(OutletL.T, OutletL.P, OutletL.z); |
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85 | "Vapour Volume" |
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86 | vV = PP.VapourVolume(OutletV.T, OutletV.P, OutletV.z); |
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87 | |
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88 | "Chemical Equilibrium" |
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89 | PP.LiquidFugacityCoefficient(OutletL.T, OutletL.P, OutletL.z)*OutletL.z = |
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90 | PP.VapourFugacityCoefficient(OutletV.T, OutletV.P, OutletV.z)*OutletV.z; |
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91 | |
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92 | "Thermal Equilibrium" |
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93 | OutletL.T = OutletV.T; |
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94 | |
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95 | "Mechanical Equilibrium" |
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96 | OutletV.P = OutletL.P; |
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97 | |
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98 | "Geometry Constraint" |
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99 | V = ML*vL + MV*vV; |
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100 | |
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101 | "Level of liquid phase" |
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102 | Level = ML*vL/Across; |
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103 | |
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104 | "Vapourisation Fraction" |
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105 | OutletL.v = 0.0; |
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106 | OutletV.v = 1.0; |
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107 | end |
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108 | |
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109 | |
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110 | #*---------------------------------------------------------------------- |
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111 | * Model of a Steady State condenser with no thermodynamics equilibrium |
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112 | *---------------------------------------------------------------------*# |
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113 | Model condenserSteady |
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114 | PARAMETERS |
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115 | ext PP as CalcObject; |
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116 | ext NComp as Integer; |
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117 | |
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118 | VARIABLES |
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119 | in InletV as stream; #(Brief="Vapour inlet stream"); |
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120 | out OutletL as stream_therm; #(Brief="Liquid outlet stream"); |
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121 | in Q as heat_rate (Brief="Heat supplied"); |
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122 | DP as press_delta (Brief="Pressure Drop in the condenser"); |
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123 | |
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124 | EQUATIONS |
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125 | "Molar Balance" |
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126 | InletV.F = OutletL.F; |
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127 | InletV.z = OutletL.z; |
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128 | |
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129 | "Energy Balance" |
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130 | InletV.F*InletV.h = OutletL.F*OutletL.h + Q; |
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131 | |
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132 | "Pressure" |
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133 | DP = InletV.P - OutletL.P; |
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134 | |
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135 | "Vapourisation Fraction" |
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136 | OutletL.v = 0.0; |
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137 | end |
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138 | |
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139 | #*------------------------------------------------------------------- |
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140 | * Condenser with reaction in liquid phase |
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141 | *--------------------------------------------------------------------*# |
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142 | Model condenserReact |
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143 | PARAMETERS |
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144 | ext PP as CalcObject; |
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145 | ext NComp as Integer; |
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146 | V as volume (Brief="Condenser total volume"); |
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147 | Across as area (Brief="Cross Section Area of reboiler"); |
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148 | |
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149 | stoic(NComp) as Real(Brief="Stoichiometric matrix"); |
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150 | Hr as energy_mol; |
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151 | Pstartup as pressure; |
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152 | |
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153 | VARIABLES |
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154 | in InletV as stream; #(Brief="Vapour inlet stream"); |
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155 | out OutletL as stream_therm; #(Brief="Liquid outlet stream"); |
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156 | out OutletV as stream_therm; #(Brief="Vapour outlet stream"); |
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157 | |
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158 | M(NComp) as mol (Brief="Molar Holdup in the tray"); |
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159 | ML as mol (Brief="Molar liquid holdup"); |
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160 | MV as mol (Brief="Molar vapour holdup"); |
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161 | E as energy (Brief="Total Energy Holdup on tray"); |
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162 | vL as volume_mol (Brief="Liquid Molar Volume"); |
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163 | vV as volume_mol (Brief="Vapour Molar volume"); |
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164 | Level as length (Brief="Level of liquid phase"); |
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165 | Q as heat_rate (Brief="Heat supplied"); |
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166 | Vol as volume; |
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167 | r as reaction_mol (Brief = "Reaction rate", Unit = "mol/l/s"); |
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168 | C(NComp) as conc_mol (Brief = "Molar concentration", Lower = -1); |
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169 | |
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170 | EQUATIONS |
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171 | "Molar Concentration" |
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172 | OutletL.z = vL * C; |
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173 | |
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174 | "Component Molar Balance" |
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175 | diff(M) = InletV.F*InletV.z - OutletL.F*OutletL.z |
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176 | - OutletV.F*OutletV.z + stoic*r*ML*vL; |
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177 | |
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178 | "Energy Balance" |
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179 | diff(E) = InletV.F*InletV.h - OutletL.F*OutletL.h |
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180 | - OutletV.F*OutletV.h + Q + Hr * r * ML*vL; |
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181 | |
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182 | "Molar Holdup" |
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183 | M = ML*OutletL.z + MV*OutletV.z; |
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184 | |
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185 | "Energy Holdup" |
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186 | E = ML*OutletL.h + MV*OutletV.h - OutletV.P*V; |
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187 | |
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188 | "Mol fraction normalisation" |
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189 | sum(OutletL.z)=1.0; |
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190 | |
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191 | "Liquid Volume" |
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192 | vL = PP.LiquidVolume(OutletL.T, OutletL.P, OutletL.z); |
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193 | "Vapour Volume" |
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194 | vV = PP.VapourVolume(OutletV.T, OutletV.P, OutletV.z); |
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195 | |
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196 | "Thermal Equilibrium" |
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197 | OutletL.T = OutletV.T; |
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198 | |
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199 | "Mechanical Equilibrium" |
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200 | OutletV.P = OutletL.P; |
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201 | |
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202 | "Geometry Constraint" |
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203 | V = ML*vL + MV*vV; |
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204 | |
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205 | Vol = ML*vL; |
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206 | |
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207 | "Level of liquid phase" |
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208 | Level = ML*vL/Across; |
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209 | |
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210 | "Vapourisation Fraction" |
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211 | OutletL.v = 0.0; |
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212 | OutletV.v = 1.0; |
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213 | |
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214 | "Chemical Equilibrium" |
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215 | PP.LiquidFugacityCoefficient(OutletL.T, OutletL.P, OutletL.z)*OutletL.z = |
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216 | PP.VapourFugacityCoefficient(OutletV.T, OutletV.P, OutletV.z)*OutletV.z; |
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217 | |
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218 | sum(OutletL.z)=sum(OutletV.z); |
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219 | |
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220 | end |
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