User can now exclude terms from objective function.
The base RON blending numbers have been exposed so that user can change.
Reformer kinetic lumps can now be entered on a volume or weight basis.
Kinetics between beds are now connected through a calculator model so that the user can decouple the kinetics of a bed to model LPG units.
The user can now create a reformer with up to 6 reactors.
The contribution of each term in the objective function is now reported
Compatibility Notes
There are no known compatibility notes or issues in release 2006.5.
Aspen RefSYS 168
What’s Fixed
The following issues were fixed in release 2006.5.
We need to provide the description and resolution.
Issue number
Issue Description Issue Resolution
Documentation CQ00265263, CQ00292634, CQ00295164
Several documentation errors related to incorrect petroleum property calculation equations such as Aniline Point, Freeze Point, and so on.
CQ00261864 Octane Number correlation from ABML are
documented and implemented in RefSYS
CQ00292638 Unit of copper content was documented
wt% but it should be ppmwt.
CQ00292643 Formula for standard liquid density is
corrected in document.
CQ00292665 Formula for VOC (total) is corrected in
document
CQ00292667 Formula for Acetaldehyde is corrected in
document
CQ00292668 Formula for Benzene(exhaust) is
corrected in document
CQ00292736 Formula for Butadiene is corrected in
document.
CQ00292737 Formula for Formaldehyde is corrected in
document
CQ00292738 Formula for NOx emission is corrected in
document.
CQ00292740 Formula for Polycyclic is corrected in
document
CQ00292742 Formula for VOC (exhaust) is corrected in
document.
CQ00277597, CQ00286828
PIMS format assay import rules have been better documented.
Integration
Aspen Simulation Workbook integration issues with RefSYS unit operations such as assay manipulator have been addressed
Aspen RefSYS 169 Issue
number Issue Description Issue Resolution
General framework
Deleting streams and unit operations at times resulted in crashes due to
incorrect cleanup of stream correlations.
This issue is fixed.
RefSYS reactors were consuming crude license, as well as Aspen Properties licenses erroneously.
Crude column calibration
CQ00285449 Users can now enter data for column
product measurement in any basis . For example, mole, mass or liquid volume basis.
CQ00292862 CQ00287049 CQ00239825
If a user specified data such that there is no overlap between adjacent products, the program warned the user of incorrect data supplied.
Before, the message provided was simply that the calibration failed and the user had no way to know which data was incorrect.
Manipulator
CQ00267225 If GC properties, such as Benzene content, 22 DMB content in an assay pseudo-component, were absent in the feed assay, the user was unable to provide their content in the product of the assay.
CQ00286823 The user now has the option to ensure that Paraffin, Olefin, Naphthene and Aromatic properties (PONA) add up to 100% for every pseudo-component.
CQ00286822 A new button is added to transfer
feed light ends to products as it is.
Petroleum Feeder
CQ00289798 User property propagation from assays attached to the petroleum feeder was broken after a case was recalled.
This issue has been corrected.
Viscosity calculation CQ00262199
CQ00262414 CQ00268305 CQ00268306
Viscosity calculation for very heavy crude had errors due to numerical issues. Very large viscosities for heavy components were getting incorrectly predicted. This is a fairly important defect that was addressed.
HYSYS and RefSYS now gives improved prediction of viscosity at the heavy end.
Aspen RefSYS 170 Issue
number Issue Description Issue Resolution
Petroleum property calculation and propagation
CQ00267449 Property propagation issues
across a tank have been addressed.
CQ00272256 CQ00272257
A separator with multiple feeds with different assays in it was not solving correctly with material balance errors. This was due to a property propagation defect,
This problem has been corrected/
CQ00225867 Consistency between
distillation curve calculation in the stream and the petroleum assay utility all across the distribution – specifically at the initial and final boiling points.
CQ00223740 Refractive index, despite
being unitless was displayed as a percentage. This was corrected.
CQ00292998 Cetane number, despite being unitless, was getting displayed in ppmwt. This issue has been corrected for new cases.
CQ00276522 Calculation of freeze point and cloud point stream level properties gave absurd numbers when there was no freeze point or cloud point assay level data in the stream.
CQ00292997 Luminometer number mixing rules were using incorrect unit conversion (“m” instead of “mm”) resulting in incorrect luminometer numbers.
CQ00224374 CQ00224375
Centroid boiling point was not propagating across the FCC.
Aspen RefSYS 171 Issue
number Issue Description Issue Resolution
PIMS assay import
CQ00294190 Several properties such as Basic Nitrogen, RON (Clear) etc, were being not imported.
CQ00259154 Issues related properties such as Paraffin content were imported but with large errors is corrected
CQ00292680 Poor match between TBP curve – supplied and imported data is corrected Properties with temperature units (such as freeze point, cloud point) were incorrectly imported from a PIMS assay.
CQ00259149 CQ00259153
A new option is added to user properties so that they are forced to stay monotonous. This allows properties such as sulfur to not extrapolate with peaks. Some properties such as paraffin content genuinely have a non-monotonous distribution and therefore the choice of whether a property is monotonous or not is left to the user..
D86 and other distillation curve calculation and interpolation CQ00261968
CQ00262517 CQ00268292
Interpolation of D86 calculations is now performed by interpolating the D86 against its corresponding TBP. This leads to correction on several issues where D86 curve plotted against varying composition displayed spikes and was thus non-smooth. The D86 curve with respect to both temperature and
composition is smooth as long as the inherent TBP curve is smooth. A TBP curve at times can be non-smooth if very few non-zero pseudo-components are present
Aspen RefSYS 172 Issue
number Issue Description Issue Resolution
Component splitter
CQ00224470 In HYSYS, the component splitter can split streams based on a TBP cut points.
These TBP cut points in turn are used to calculate the composition of each of the products. While using the component splitter in RefSYS, if the user specified the TBP cut points, that did not translate into correct composition at the outlet of the products.
This issue has been corrected
Petroleum shift reactor
CQ00293552 It is now possible for RefSYS users to use a petroleum shift reactor even when the feed has no assay information.
CQ00287523 IBP and FBP data for each of the products was not getting restored on recalling a case.
CQ00288524 The worksheet in the petroleum shift reactor displayed the same product stream twice erroneously, this issue is now addressed.
CQ00290924 Assay properties drop down list shown on the Product Properties page did not function properly. The properties shown in list did not relate to the chosen Cut in Assay Properties definition.
This issue is now fixed.
CQ00294694 Units of measure related to the IBP and FBP of products as well as some pure component products were incorrect.
CQ00271048 CQ00272260
Incorrect variables were getting deleted when the Delete Variable button was pressed on the Design | Model data page. Adding a variable also had a crash problem.
CQ00293505 The petroleum shift reactor did not function if no independent variables are chosen by the user.
Now it functions by simply providing the base yield data.
CQ00264779 - kscfd is added as a molar unit
so that gas flow based yields can be expressed in kscfd
Aspen RefSYS 173 Issue
number Issue Description Issue Resolution Equation Oriented simulation
CQ00292286 User can add a pump around to Radfrac
column.
CQ00274766 The transition (EO Sub flowsheet) from the
external inlet to the internal inlet does an PH flash and solves correctly.
CQ00277135 Compressor settings work fine on the
graphical user interface level.
CQ00292121 CQ00292136 CQ00293141
Changing values in the Flowsheet setup->EO Input works fine while in EO mode.
CQ00241274 No inconsistency when a Ryield is run.
CQ00291469 RadFrac user interface has been
cleaned up.
CQ00291471 CQ00295269 CQ00291469
Petrofrac user can create the design specs and the unit of measure is correctly used and displayed.
CQ00291161 CQ00272450
Valid phase specification not available for a flash.
Aspen Properties flash requires valid phases specified before performing a flash. The valid phases has now been defaulted to vapor-liquid-freewater.
This is carried forward to all unit operations. Further streams, at the outlet of each unit operation now take the valid phase option from their upstream unit operation.
CQ00267896 The Petrofrac column can be resynced
from EO to SM several times without crashing
CQ00295269 Correct units are displayed for
Enathalpy in the TPFQ profiles page on Radfrac and Petrofrac.
CQ00291256 Every time an SM to EO synchronization is done, the
structural changes are also updated to the EO variables
Aspen RefSYS 174 Issue
number Issue Description Issue Resolution Equation Oriented simulation
CQ00267724 CQ00292303
Several unit operations settings which used a drop-down list to choose a setting were not getting restored correctly upon recall.
CQ00289566 CQ00268011
Several issues related to addition and deletion of spec groups and connections have been addressed.
CQ00268032, CQ00268104
Multiple EO cases loaded in one RefSYS or Upstream session would lead to erratic or incorrect behavior after closing one of the cases.
CQ00295294 CQ00267725
Refsys EO and the Refsys Reactor models work in sequence.
FCC
CQ00158332 API/SG and CCR/RCR should are no
longer considered as independent inputs when calculating feed biases.
The user now enters either API or SG and either CCR or RCR.
CQ00204914 A warning message has been added
warning that regenerator failures with low bed vs. flue delta temp are possible.
CQ00216314 FCC "Fraction of S processed" is now
user input for externally connected feeds.
CQ00254825 The EO variable button is now tied to
the bottom right corner so that it moves correctly when the FCC workbook is resized.
CQ00265348 Coke calculation for two-stage
regenerator validation wizard is now correct.
CQ00267371 When feed CCR is zero, the value now
gets sent to the FCC as 0.01 so that FCC does not go singular.
CQ00268767 Data check ensures that all naphthas
have non-zero naphtha component in the light end measurements of calibration environment. This will prevent the model from going singular.
Aspen RefSYS 175 Issue
number Issue Description Issue Resolution FCC
CQ00270863 External stream is no longer required
for the FCC to solve within a main flowsheet.
CQ00272682 FCC calibration Analysis/Worksheet
and Prediction pages now have correct units and data.
CQ00274729 Regenerator specification options for
a predict case now match the options available in a simulate case..
CQ00274731 Zero biases for FCC fingerprint biases
now correctly get set to zero (rather than EMPTY) when exported.
CQ00286035 Failure recovery in the calibration environment
Failure recovery in the calibration environment is now correctly taking the option specified in the calibration environment on the Operation | Solver Options page.
CQ00288170 Import of factor sets now correctly
gets values for ethane, ethylene, propane, propylene, and n-butane delumping factors.
CQ00288501 Property curve calculations now work
properly even if some fractions have zero (or EMPTY, where allowable) properties.
Hydrocracker
CQ00215407 Inconsistent labeling for calibration factors in the Hydrocracker.
changed “tuning factors” to
“calibration factors” on the Design page in the main environment
CQ00216021 H2S and NH3 are now included on the
yields page.
CQ00262174 The product stream off of a
hydrocracker is now correctly labeled as HPS liquid.
CQ00262176 The Notes page is available and
functional in the calibration environment.
CQ00262177 Fly-by descriptions have been added
for the Sigmas for the hydrocracker.
Aspen RefSYS 176 Issue
number Issue Description Issue Resolution Hydrocracker
CQ00264456 The user can now change the name of
internal feed stream for the hydrocracker.
CQ00265346 The hydrocracker now uses the
distillation type specified for the feed rather than assuming it is a D2887.
CQ00271953 HCR.cml was modified so that the
boiling points of HN1 and HA1 were consistent with OOMF calculations.
CQ00272286 On the Results/Hydrogen system
page, the label for H2S removal has been correctly set. For previous versions, it was referring to it as SO2.
CQ00272509 A check has been added so that if a
negative value is calculated for Cn (naphthenic carbon) from the NDM method, the model uses a small positive value (0.01) instead. This will prevent any model instability due to a negative Cn concentration.
CQ00272861 The labels for the square cut products
on the Results/Product Yields page have been fixed. They now read
"Diesel 430-700F", "Bottoms 700-1000F", and "Resid1000+ F". Previous versions used Kerosene, Diesel, and Bottoms, respectively, which was incorrect.
CQ00273243 The pressure of bed 1 of reactor 2 is
now getting properly set. In previous versions, an incorrect specification meant that the pressure from the outlet of reactor 1 was not getting passed through to the inlet of reactor 2.
CQ00274444 The vapor flow and composition for
the 2nd recycle gas loop are now correctly reported. In previous versions, the vapor flow and composition for the 1st recycle gas loop was reported for both the 1st and 2nd recycle gas loops.
Aspen RefSYS 177 Issue
number Issue Description Issue Resolution Hydrocracker
CQ00285863 Older cases with hydrocrackers should
now always come up square.
Previously, some older cases did not have the correct degrees of freedom.
CQ00286171 For the hydrocracker, the outlet
temperature for the recycle gas compressor has now been exposed in the RefSYS interface. This
temperature can be used to specify quench gas temperature.
CQ00289988 LHSV for the Hydrocracker model is
now selectable when you are putting together a databook.
Reformer
CQ00204031 A results workbook is now available
for reformer units. In the simulation environment, the user can access this from the Reformer menu (4th item).
CQ00204845 The user may now specify the
reformer feed on a weight or volume basis. In previous versions, the user was only able to specify on a volume basis
CQ00207235 Feed properties and kinetic lumps
have been exposed so that the user may change from a spreadsheet unit or use in a case study.
CQ00214413 The unit for the delta P of the product
heater now shows up. In previous versions, no unit was displayed.
CQ00223450 When the user creates a semi-regen
reformer, default values for the Equilibrium Distribution Factors are now automatically supplied.
CQ00223454 The update of the Feed Blend page for
a reformer is now nearly instantaneous.
CQ00226915 An error message is generated when
the start time is entered with a number larger than the end time for semi-regen reformers. The model will not solve unless the user inputs an end time greater than the start time.
This check was necessary to prevent model instability due to negative times.
CQ00242490 A more realistic default reformer feed
fingerprint has been supplied for the 2006.5 release
Aspen RefSYS 178 Issue
number Issue Description Issue Resolution Reformer
CQ00252631 A fly-by description has been added
for the detailed volume percent yields so that it is clear the H2, Methane, Ethane, and Ethylene volume yields are on an FOE basis
CQ00256123 Simulation cases for any reactor
model should now run after a reformer or hydrocracker calibration is run. In previous versions, it was possible for a simulation case for a different reactor model to not run because of the objective function that was set in a reformer or hydrocracker calibration run.
CQ00258950 Issues with the calculation of A8 distribution into ethylbenzene, and m-xylene, o-xylene, and p-xylene
This issue was fixed so that there is no longer a limit to the m-xylene.
Previously, as m-xylene approached 50%, the model could get to a point where it wouldn't solve.
CQ00260468 The D86 option for reformer feeds
now works. In previous versions, no API data book conversions were being done and the D86 option would either fail or it would be assumed that it was a TBP distillation.
CQ00264236 All pinning calculations have been
disabled for semi-regen reformer units. In previous versions, the calculations were taking place. The calculations didn't affect any results, but they did cause the model to open up more than necessary.
CQ00264368 Fly-by descriptions have been added
for the reformer on the Operation Feeds page for the Volume Flow and Std. Volume Flow Columns so that it is clear what is meant.
Aspen RefSYS 179 Issue
number Issue Description Issue Resolution Reformer
CQ00264453 The units for catalyst density on the
reformer configuration wizard now show up.
CQ00264459 The calculations for H2/HC ratio and
recycle gas rate have been fixed for the objective function. In previous versions, the H2/HC ratio calculation was incorrect and the recycle gas rate was often set to Empty.
CQ00268303 The completeness check for the
reformer calibration environment is now checking to see that all feeds are complete. In previous versions, it was possible to add a new feed without specifying it and the model thought it was ready to run.
CQ00270889 The product yields in the objective
function are now correctly calculated.
In previous versions, unless the data was 100% mass balanced, there was some error in the calculation of the product yields proportional to the mass balance error.
CQ00289984 The calculation of total xylenes on the
Results | Summary page has been fixed so that the correct value is reported
CQ00289986 Standard volume flow can now be selected
as an independent variable in a case study provided that it was specified in the case