Information Technology Reference
In-Depth Information
Workshop 5.3
Using Workshop 5.1 as a basis, create a Sensitivity study to determine
the effect of feed composition on the concentration of ethanol in stream B and water
in stream H. To do this it is necessary to change the quantity of ethanol in stream
A while reducing the amount of water in stream A by the same amount for each
case. Aspen Plus's Sensitivity function will permit variation in the ethanol quantity for
each case, but it will be necessary to write Fortran that executes prior to each time
the Distillation I block executes. This capability will be found under “Flowsheeting
Options—Calculator.” Use the following values of ethanol in A, in units of lb/hr, for
your Sensitivity studies: 1000, 1100, 1500, 2000, and 5000.
Workshop 5.4
Part of a plant-wide environmental control facility (ECF) is a system
for diverting aqueous waste fluids from a discharge point such as a river in the event
that the concentration of volatile organic compounds (VOCs) exceeds a certain level.
This logic is to be modeled by employing a splitter with two product streams. If the
composition of the VOCs exceed 20 parts per billion, the stream is to be diverted to the
second outlet of the splitter. Otherwise, the stream is to be diverted to the first outlet.
Execute a calculation block in front of the splitter to program the logic in Fortran. Test
with the two potential feeds listed in Table 5.2.
TABLE 5.2 ECF Feeds
Component
VOC
Feed 1 lb/hr
Feed 2 lb/hr
Methanol
Yes
1
10
Acetone
Yes
2
20
Toluene
Yes
3
30
Methylene chloride
Yes
4
40
1
.
0
×
10
9
1
.
0
×
10
9
Wa t er
No
Workshop Notes
Workshop 5.3
The Fortran statement required may be found in the file Workshops/
Five-3.txt.
Workshop 5.4
The Fortran statements required may be found in the file Work-
shops/Five-4a.txt.
REFERENCES
Aspen Plus version 7.0, About the Interpreter documentation.
Intel Fortran Programmer's Reference, http://docs.nscl.msu.edu/ifc/intelfor_prglangref.pd, 1996-2003.
