A SIMPLE NITROGEN DISTRIBUTION NETWORK
View: Process Flow Diagram
View: Simulation Results
This example shows a simple nitrogen distribution network built up by 8 pipes and 4 nodes, as may be viewed in the process flow diagram.
The network has one inlet stream S1 and three outlet streams S5, S7 and S8.
Distribution network operations are to be simulated to satisfy the following constraints on the outlet streams.
|
Spec No |
Spec Type |
Stream |
Value |
|
1 |
Pressure |
S5 |
28 psia |
|
2 |
Flowrate |
S7 |
2550 s-cuft/h |
|
3 |
Flowrate |
S8 |
2550 s-cuft/h |
Inlet stream S1 is initialized at 40 psia and 70 °F with an initial flowrate of 25 lbm/h
The network is easily solved using 5 iterations.
The final calculated flowrate S1 is 29.9 lbm/h or 838 lb/h.
<XPSIM> ...generated by XpsimWin v.1.06 ...
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RUN ID=DEV CUSTOMER=STAFF PROJECT='NITROGEN DIST'
DESC PIPE NETWORK
DESC EXAMPLE 1 - NITROGEN DISTRIBUTION SYSTEM
DESC IDEAL GAS EQUATION
DIMENSION INPUT ENG
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System Data
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CHEMCOMP N2
THERMSET UID=M1
METHODS K=SRK HS=SRK CP=SRK DV=SRK DL=IDEAL VIS=IDEAL THC=IDEAL +
SURT=IDEAL
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Default Data
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PIPE
PARA ROUGH(ABS)=0.0018
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Flowsheet Data
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STREAM=S1 TEMP=70. PRES=40.0 RATE(M)=25
COMP 1.000
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PIPE IN S1 OUT L1O UID=L1
LINE DIAM=3 LENGTH(M)=20 ECH(M)=-10
FITTING GLOBE 6.0
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NODE IN L1O OUT L2I L3I UID=NODE2
ESTIMATE STR=L2I RATE=0.5 RATIO
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PIPE IN L2I OUT L2O UID=L2
LINE DIAM=2 LENGTH(M)=20
FITTING GLOBE 2.7
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PIPE IN L3I OUT L3O UID=L3
LINE DIAM=1 LENGTH(M)=30
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NODE IN L3O OUT L5I L4I UID=NODE3
ESTIMATE STR=L5I RATE=0.5 RATIO
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PIPE IN L4I OUT L4O UID=L4
LINE DIAM=1 LENGTH(M)=30
FITTING GLOBE 6.75
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PIPE IN L5I OUT L5O UID=L5
LINE DIAM=1.5 LENGTH(M)=20 ECH(M)=-10
FITTING GLOBE 6.75
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NODE IN L4O L5O OUT L6I UID=NODE4
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PIPE IN L6I OUT S5 UID=L6
LINE DIAM=2.0 LENGTH(M)=50
FITTING GLOBE 30.
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NODE IN L2O OUT L8I L7I UID=NODE6
ESTIMATE STR=L8I RATE=0.5 RATIO
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PIPE IN L7I OUT S7 UID=L7
LINE DIAM=1 LENGTH(M)=10 ECH(M)=-6
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PIPE IN L8I OUT S8 UID=L8
LINE DIAM=1 LENGTH(M)=10 ECH(M)=-6
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Network Data
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PIPENET NITER=10
SPEC PRES=28. STR=S5
SPEC RATE(G)=2550 STR=S7
SPEC RATE(G)=2550 STR=S8
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Output Data
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PRINT FORMAT=2
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END