source: trunk/eml/streams.mso @ 331

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1#*-------------------------------------------------------------------
2* EMSO Model Library (EML) Copyright (C) 2004 - 2007 ALSOC.
3*
4* This LIBRARY is free software; you can distribute it and/or modify
5* it under the therms of the ALSOC FREE LICENSE as available at
6* http://www.enq.ufrgs.br/alsoc.
7*
8* EMSO Copyright (C) 2004 - 2007 ALSOC, original code
9* from http://www.rps.eng.br Copyright (C) 2002-2004.
10* All rights reserved.
11*
12* EMSO is distributed under the therms of the ALSOC LICENSE as
13* available at http://www.enq.ufrgs.br/alsoc.
14*
15*--------------------------------------------------------------------
16* Model of basic streams
17*----------------------------------------------------------------------
18* Author: Paula B. Staudt and Rafael de P. Soares
19* $Id: streams.mso 325 2007-07-29 00:41:04Z arge $
20*---------------------------------------------------------------------*#
21
22using "types";
23
24Model stream
25        ATTRIBUTES
26        Pallete = false;
27        Brief = "General Material Stream";
28        Info =
29        "This is the basic building block for the EML models.
30        Every model should have input and output streams derived
31        from this model.";
32       
33        PARAMETERS
34        outer NComp as Integer (Brief = "Number of chemical components", Lower = 1);
35
36        VARIABLES
37        F as flow_mol;
38        T as temperature;
39        P as pressure;
40        z(NComp) as fraction(Brief = "Overall Molar Fraction");
41        h as enth_mol;
42        v as fraction(Brief = "Vapourization fraction");
43end
44
45Model liquid_stream as stream
46        ATTRIBUTES
47        Pallete = false;
48        Brief = "Liquid Material Stream";
49        Info =
50        "Model for liquid material streams.
51        This model should be used only when the phase of the stream
52        is known ''a priori''.";
53
54        PARAMETERS
55        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
56       
57        EQUATIONS
58        "Liquid Enthalpy"
59        h = PP.LiquidEnthalpy(T, P, z);
60        "Liquid stream"
61        v = 0;
62end
63
64Model vapour_stream as stream
65        ATTRIBUTES
66        Pallete = false;
67        Brief = "Vapour Material Stream";
68        Info =
69        "Model for vapour material streams.
70        This model should be used only when the phase of the stream
71        is known ''a priori''.";
72
73        PARAMETERS
74        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
75       
76        EQUATIONS
77        "Vapour Enthalpy"
78        h = PP.VapourEnthalpy(T, P, z);
79        "Vapour stream"
80        v = 1;
81end
82
83Model streamPH as stream
84        ATTRIBUTES
85        Brief = "Stream with built-in flash calculation";
86        Info = "
87        This model should be used when the vaporization fraction
88        is unknown.
89       
90        The built-in flash calculation will determine the stream
91        state as a function of the overall composition '''z''', the
92        pressure '''P''' and the enthalpy '''h'''.
93       
94        Additionally, the liquid composition '''x''' and the vapor
95        composition '''y''' are calculated.     
96        ";
97        Pallete = false;
98       
99        PARAMETERS
100        outer PP as Plugin(Brief = "External Physical Properties", Type="PP");
101       
102        VARIABLES
103        x(NComp) as fraction(Brief = "Liquid Molar Fraction");
104        y(NComp) as fraction(Brief = "Vapour Molar Fraction");
105       
106        EQUATIONS
107        "Flash Calculation"
108        [v, x, y] = PP.FlashPH(P, h, z);
109        "Enthalpy"
110        h = (1-v)*PP.LiquidEnthalpy(T, P, x) +
111                v*PP.VapourEnthalpy(T, P, y);
112end
113
114Model source
115        ATTRIBUTES
116        Pallete = true;
117        Icon = "icon/Source";
118        Brief = "Material stream source";
119        Info = "
120        This model should be used for boundary streams.
121        Usually these streams are known and come from another process
122        units.
123
124        The user should specify:
125         * Total molar (mass or volumetric) flow
126         * Temperature
127         * Pressure
128         * Molar (mass or volumetric) composition
129       
130        No matter the specification set, the model will calculate some
131        additional properties:
132         * Mass density
133         * Mass flow
134         * Mass compostions
135         * Specific volume
136         * Vapour fraction
137         * Volumetric flow
138         * Liquid and Vapour compositions
139        ";
140
141        PARAMETERS
142        outer PP                        as Plugin               (Brief = "External Physical Properties", Type="PP");
143        outer NComp             as Integer              (Brief = "Number of chemical components", Lower = 1);
144                  M(NComp)      as molweight    (Brief = "Component Mol Weight");
145                  rhoModel              as Switcher             (Brief = "Density model", Valid = ["volume", "correlation"], Default="volume");
146       
147        SET
148
149        M   = PP.MolecularWeight();
150
151        VARIABLES
152        out Outlet                      as stream                       (Brief = "Outlet stream", PosX=1, PosY=0.5256);
153        x(NComp)                        as fraction                     (Brief = "Liquid Molar Fraction");
154        y(NComp)                        as fraction                     (Brief = "Vapour Molar Fraction");
155        hl                                      as enth_mol;
156        hv                                      as enth_mol;
157        zmass(NComp)            as fraction                     (Brief = "Mass Fraction");
158        Mw                                      as molweight            (Brief = "Average Mol Weight");
159        vm                                      as volume_mol           (Brief = "Molar Volume");       
160        rho                                     as dens_mass            (Brief = "Stream Mass Density");
161        rhom                            as dens_mol                     (Brief = "Stream Molar Density");
162        Fw                                      as flow_mass            (Brief = "Stream Mass Flow");
163        Fvol                    as flow_vol         (Brief = "Volumetric Flow");
164       
165        EQUATIONS
166        "Flash Calculation"
167        [Outlet.v, x, y] = PP.Flash(Outlet.T, Outlet.P, Outlet.z);
168       
169        "Overall Enthalpy"
170        Outlet.h = (1-Outlet.v)*PP.LiquidEnthalpy(Outlet.T, Outlet.P, x) +
171                Outlet.v*PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
172       
173        hl = PP.LiquidEnthalpy(Outlet.T, Outlet.P, x);
174        hv = PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
175       
176        "Average Molecular Weight"
177        Mw = sum(M*Outlet.z);
178
179        switch rhoModel
180                case "volume":
181        "Molar Density"
182                rhom * vm = 1;
183               
184                case "correlation":
185        "Mass Density"
186                rho*((1-Outlet.v)/PP.LiquidDensity(Outlet.T,Outlet.P,x) + Outlet.v/PP.VapourDensity(Outlet.T,Outlet.P,y)) = 1;
187        end
188       
189        "Mass or Molar Density"
190        rhom * Mw = rho;
191
192        "Flow Mass"
193        Fw      =  Mw*Outlet.F;
194
195        "Molar Volume"
196        vm = (1-Outlet.v)*PP.LiquidVolume(Outlet.T, Outlet.P, x) + Outlet.v*PP.VapourVolume(Outlet.T,Outlet.P,y);
197       
198        "Volumetric Flow"
199        Fvol = Outlet.F*vm ;
200       
201        "Mass Fraction"
202        zmass = M*Outlet.z / Mw;       
203       
204end
205
206Model simple_source
207        ATTRIBUTES
208        Pallete = true;
209        Icon = "icon/Source";
210        Brief = "Simple material stream source";
211        Info = "
212        This model should be used for boundary streams.
213        Usually these streams are known and come from another process
214        units.
215
216        The user should specify:
217         * Total molar flow
218         * Temperature
219         * Pressure
220         * Molar composition
221        ";
222
223        PARAMETERS
224        outer PP                        as Plugin               (Brief = "External Physical Properties", Type="PP");
225        outer NComp             as Integer              (Brief = "Number of chemical components", Lower = 1);
226       
227        VARIABLES
228        out Outlet                      as stream               (Brief = "Outlet stream", PosX=1, PosY=0.5256);
229        x(NComp)                        as fraction             (Brief = "Liquid Molar Fraction");
230        y(NComp)                        as fraction             (Brief = "Vapour Molar Fraction");
231        hl                                      as enth_mol;
232        hv                                      as enth_mol;
233
234        EQUATIONS
235        "Flash Calculation"
236        [Outlet.v, x, y] = PP.Flash(Outlet.T, Outlet.P, Outlet.z);
237       
238        "Overall Enthalpy"
239        Outlet.h = (1-Outlet.v)*PP.LiquidEnthalpy(Outlet.T, Outlet.P, x) +
240                Outlet.v*PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
241
242        hl = PP.LiquidEnthalpy(Outlet.T, Outlet.P, x);
243        hv = PP.VapourEnthalpy(Outlet.T, Outlet.P, y);
244end
245
246Model sink
247        ATTRIBUTES
248        Pallete = true;
249        Icon = "icon/Sink";
250        Brief = "Material stream sink";
251        Info = "
252        This model should be used for boundary streams when additional
253        information about the stream is desired.
254
255        Some of the additional informations calculated by this models are:
256         * Mass density
257         * Mass flow
258         * Mass compostions
259         * Specific volume
260         * Vapour fraction
261         * Volumetric flow
262         * Liquid and Vapour compositions
263        ";
264
265        PARAMETERS
266        outer PP                        as Plugin               (Brief = "External Physical Properties", Type="PP");
267        outer NComp             as Integer              (Brief = "Number of chemical components", Lower = 1);
268                  M(NComp)      as molweight    (Brief = "Component Mol Weight");
269                  rhoModel              as Switcher             (Brief = "Density model", Valid = ["volume", "correlation"], Default="volume");
270       
271        SET
272
273        M   = PP.MolecularWeight();
274       
275        VARIABLES
276        in Inlet                as stream               (Brief = "Inlet Stream", PosX=0, PosY=0.5308);
277        v                               as fraction             (Brief = "Vapourization fraction");
278        x(NComp)                as fraction             (Brief = "Liquid Molar Fraction");
279        y(NComp)                as fraction             (Brief = "Vapour Molar Fraction");
280        zmass(NComp)    as fraction             (Brief = "Mass Fraction");
281        Mw                              as molweight    (Brief = "Average Mol Weight");
282        vm                              as volume_mol   (Brief = "Molar Volume");       
283        rho                             as dens_mass    (Brief = "Stream Mass Density");
284        rhom                    as dens_mol             (Brief = "Stream Molar Density");
285        Fw                              as flow_mass    (Brief = "Stream Mass Flow");
286        Fvol            as flow_vol     (Brief = "Volumetric Flow");
287       
288        EQUATIONS
289        "Flash Calculation"
290        [v, x, y] = PP.FlashPH(Inlet.P, Inlet.h, Inlet.z);
291       
292        "Average Molecular Weight"
293        Mw = sum(M*Inlet.z);
294
295        switch rhoModel
296                case "volume":
297        "Molar Density"
298                rhom * vm = 1;
299               
300                case "correlation":
301        "Mass Density"
302                rho * ((1-v)/PP.LiquidDensity(Inlet.T,Inlet.P,x) + v/PP.VapourDensity(Inlet.T,Inlet.P,y)) = 1;
303        end
304       
305        "Mass or Molar Density"
306        rhom * Mw = rho;
307
308        "Flow Mass"
309        Fw      =  Mw*Inlet.F;
310
311        "Molar Volume"
312        vm = (1-v)*PP.LiquidVolume(Inlet.T, Inlet.P, x) + v*PP.VapourVolume(Inlet.T,Inlet.P,y);
313       
314        "Volumetric Flow"
315        Fvol = Inlet.F*vm ;
316       
317        "Mass Fraction"
318        zmass = M*Inlet.z / Mw;
319       
320end
321
322Model simple_sink
323        ATTRIBUTES
324        Pallete = true;
325        Icon = "icon/Sink";
326        Brief = "Simple material stream sink";
327        Info = "
328        This model should be used for boundary streams when no additional
329        information about the stream is desired.
330        ";
331       
332        VARIABLES
333        in Inlet                as stream       (Brief = "Inlet Stream", PosX=0, PosY=0.5308);
334end
335
336Model energy_stream
337        ATTRIBUTES
338        Pallete = false;
339        Brief = "General Energy Stream";
340        Info =
341        "This is the basic building block for the EML models.
342        Every model should have input and output energy streams
343        derived from this model.";
344
345        VARIABLES
346        Q as heat_rate(Brief="Energy rate");
347end
348
349Model energy_source
350        ATTRIBUTES
351        Pallete = true;
352        Icon = "icon/energy_source";
353        Brief = "Enegry stream source";
354
355        VARIABLES
356        out OutletQ             as energy_stream (Brief = "Outlet energy stream", PosX=1, PosY=0.5349);
357end
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