Petro-SIM 7.0 SP2 Changelist
List of enhancements included in this service pack
DC-SIM
Add tuning parameter to adjust cracked feed determination
- Previous DC-SIM methodology for determining whether a feed is cracked or straight-run material depends on Watson K value of each feed stream compared to fixed internal value (10.5). This enhancement opens up the fixed Watson K value to allow users to appropriately recognize all cracked feed streams (especially relevant if previously saw discontinuity when shifting feed properties)
- Recommend adjusting new tuning parameter to around 10 if seeing discontinuities in original case.
Update impact of Feed T on Coke Yield
- Previous DC-SIM functionality without additional tuning adjustment resulted in higher than commercially seen impact of Feed T on Coke Yield due to amount of cracking assumed in furnace by the model.
- New Furnace Cracking Calculation Method introduced to select newer cracking calculation impact. Recalibration recommended upon switching method.
HXX-SIM
Add support for light-end (C4-) feed
- Improved recognition of C4- feed to hydroprocessing units allowing for direct connection of feeds with C4- material (especially relevant for NHT and CNHTR units).
- For previous cases with workarounds for recognizing C4- feed, recommend migrating and switching to standard connection approach for simplified model.
- Small results change as a result of improved feed handling. Recalibration encouraged if significant C4- feed present.
List of bug fixes included in this service pack
SIM Suite Reactors Models - HXX-SIM
| Defect | Description |
| 16787 | Poly-aromatics reactor validation step error message prevents calibration |
| 16746 | CNHTR-SIM S/N override only works for 2rx config (diolesat/deS) but not single-rx (selective hds/sulfur shift) |
| 16646 | Cold predict failed if liquid recycle present even though calibration/back-predict/primed-predict succeeded with the same input data |
| 16508 | Collaboration not working properly with CDB |
| 16119 | Workbook synthesized effluent data not consistent with PS data upon migration |
| 15702 | Excel CDB Editor workbook does not function properly in foreign versions of Excel |
| 15433 | Incomplete Difficult Sulfur and Very Difficult Sulfur assays in mixed feed stream resulting in incorrect sulfur type interpretation |
SIM Suite Reactors Models - FCC-SIM
| Defect | Description |
| 16361 | Calibration with poor effluent distillation resulting in unhelpful error during back-predict |
| 16096 | Remove unused recycle rate variables from workbook (not in PS view) |
| 11338 | Light Naphtha Olefins does not match calibration input when PONA for all Naphtha cuts not provided |
| 9636 | Corresponding calculated Enriched O2 Injection values not correctly copied as targets to inputs |
SIM Suite Reactors Models - DC-SIM
| Defect | Description |
| 16793 | DC-SIM returning different results based on feed stream order when non-Tray 1 feeds present |
| 11440 | DC-SIM mass balance error in Drum Vapor/Frac Inlet stream when light feed to tower is present |
SIM Suite Reactors Models - REF/ISOM-SIM
| Defect | Description |
| 16466 | REF-SIM RIT low limit of 420C preventing from running as low as 400C |
| 16356 | ISOM should have errored out when reactor pressure profile is increasing |
| 15289 | CCR autotuning for Coke on Catalyst (COC) does not work with alternate catalyst circulation rate |
| 14990 | ISOM-SIM integrated optimizer issues |