UniSim Design R390动态模拟新功能_图文

1、UniSim Design R390 New Features/Enhancements for Dynamic ApplicationsApril 2009 Heat Exchanger (HX and Transmitter malfunctions Global and Custom malfunctionsTemperature PV in controller ramp to heat trace temperature Allow for Automatic Ramp of Transfer Function Restriction OrificeNozzle data prese

2、rvationParticle Size Distribution support in DynamicsAPI Relief ValveProfit Controller enhancementsLicensing option for proprietary technologiesAlarm ManagerSolids Merge handling in DynamicsLogical Operation connection fixes/improvements Following types of malfunctioning are now supportedOverall Per

3、formance deteriorationShell and/or Tube fouling affecting pressure drop and/or heattransferTube to Shell (or vice-versa leakageLeakage can only be invoked if shell & tube side use same Fluid Packages & components careful!This is supported for the Basic or Detailed HX and also theKettle/Tube

4、Bundle within the SeparatorSupported within UniSim Operations by R330 for OTS applications Following types of malfunctioning are now supportedPV driftFail to certain value or hold at currentNoiseThis is supported for the PID FB Controller (in Indicate mode or otherwise and also via a generic Signal

5、Malfunction in the Enhanced MV TableSupported within UniSim Operations by R330 (and in R320 patch Following types of malfunctioning are now supported Instrument Air (valvesElectrical (valves, pumps, air coolers, digital operationsBoundary Stream (cooling water, etcBoundary stream malfunctions can “f

6、ail”any of T, P, H, Vapor Fraction or compositionSupported within UniSim Operations by R330 Following types of malfunctioning are now supportedAlgebraicDiscreteAny simulation variable (accessible from the Variable Navigatorcan be “failed”Supported within UniSim Operations by R330 Does not just have

7、to ramp to ambient T but can also ramp to a specific T Easier access to start, stop and reset a Transfer Function ramp from a Spreadsheet, Event Scheduler, etc New RO functionality added to the UniSim Design Relief Valve Uses the same correlations as the relief valveMatches well with the ISO-5167 an

8、d AGA-3 standards although some tuning of the Discharge Coefficient may be required for exact matching Previously if user disconnected and reconnected a stream (or connected a new stream in its place, the nozzle data would be lost Now this nozzle elevation and diameter is rememberedSince some stream

9、 cutters are automatically removed at times, this will ensue that elevation data is not lost Solids Particle Size Distribution (PSD data is nowPropagated along the flow path and throughout the dynamicflowsheetMixed appropriately where ever 2 or more streams enter Two mixed streams can have a differe

10、nt number of particles or particle diameters, but this is rare. There are mixing rules for this.Feeder and Product Blocks can also specify PSD and other properties (catalyst andpolymer The Relief Valve has been validated against API Recommended Practice 520Liquid, Vapor and Choked Vapor flows have b

11、een matched Currently a simplified approach is taken for the more complicated two phase flow regime although implementation of HEM modeling approaches is being considered for the future. A small modification has been made to the existing 2 phase flows: Easy switchover between APC and Regulatory Cont

12、rol layer PV of a PID FB Controller can now also be flowsheeted on to the CV of a Profit ControllerMV (output of a Profit Controller can be flowsheeted to input 1 ofa Selector & PID FB Controller OP goes to input 2 then useHand Select mode to dictate selected control layerBack propagation initia

13、lization from the Selector to the non-selected input is supported for bumpless switchoverModel gain and delay values can be viewed from the Operation tab, Gain and Delay page. Model gains and delays can also be modified and sent to Profit ControllerState of the Profit Controller(Handling constraint,

14、 control ok, optimizing is displayed on the Operation page.User can choose to reset or retain some user settings and limits when re-loading xm and xs file.User can select to delete intermediate testing files during auto tests. A “Drop CV”checkbox is available for dropping a CV for each CV.SP vs. Ran

15、ge Control is set automatically when loading a set of xm and xs files.PID controller is automatically set to Auto mode when the master Profit Controller is turned OFF.Correct CV SS values and future values are displayed.MV moves displayed set to 0 when MVs are dropped.Total test time in Auto test is

16、 calculated correctly. The ported and wrapped Shadow Plant modules that are now in UniSim Design. All have their own individual ULM license key Individual licensing is also required for each of the UOP proprietary reactorsThese license are typically for OTS use only A single view is now available fo

17、r reporting all Controller alarms This is very similar to a DCS Alarm displayIntegrated through to UniSim Operations Alarm Display (UniSim Operations R320 patchTrace and Status window will no longer be cluttered with alarms Further work planned for Digital Point and Cause and Effect alarms to be sen

18、t to Alarm Manager In Dynamics, only 3 Fluid Phase can be supportedTo overcome this when modeling V/L1/L2/S, two phases are merged after the steady state flashIt is important, however, to always merge the 2 particular phase slots that the user has selected to merge.This is necessary to ensure consis

19、tency in the dynamic model and prevent phase flipping. A new PDF nozzle (green connection dot has been added at the 2 oclock position of the PID FeedBack ControllerThis allows for an Indicator to be flowsheeted to a controller or digital point without the additional selection of the PV a second time

20、. This was quite common in OTS projects but would lead to crashes and other mal-symptoms. See “UniSim Design LogicalConnection Improvements.doc”for more details A collection of other fixes and enhancements has been done for UniSim Design in Dynamics. Equilibrium reactions will now support total over

21、all (non-phase specific mole fraction as the concentration term entering into the equilibrium constant definitionThis allows solid components to enter into the Keq definitionand hence reactions where solids may be a limiting reactantare correctly handledPreviously these reactions would experience pe

22、rpetual non-convergence and slow the simulationOn Equil Rxn view, Basis tab, Phase = Overall Combined Kinetic reactions will also support total (non-phase specific mole fraction as the concentration term in the rate equationThis allows the modeling of reactions with a solid reactant(not previously p

23、ossibleThis is also a simpler approach that may be preferable bysome simulation engineers. A new view has been added to see the reaction stoichiometry of all reactions of a reaction set in one matrix (Reaction Set view, View Rxn Matrix button For Separator outlet streams, phase mole fractions were i

24、ncorrectly set equal to the holdup volume fractions at the outlet nozzle window which leads to incorrect residence times for the holdup phasesThis has been correctedSee “UniSim Design Phase Volume Holdup.doc”for full details Dynamic Efficiencies can be used to tune a separator flash to give a broad

25、spectrum of non-equilibrium results (with phase temperatures being differentHowever the resulting model is dependent on both time step and relative holdups of phases (liquid level for exampleThis can have a profound effect on simulation results and suggest completely incorrect steady state results f

26、rom the dynamic model.This has been corrected (checkbox should be checkedSee “UniSim Design Dynamic Efficiencies Fixed.doc”for details A problem has been demonstrated where a change in feed stream phase fractions will not produce (any way near the correct transient response in phase holdups (in a Se

27、parator or HX, for example or outlet stream phase fractions.This problem has been corrected set Beta to 0.0 for new behavior.See “UniSim Design Modeling of Phase Holdup Improvement.doc”for details A new approach to convective heat transfer using an improved LMTD equation has been implement (referred

28、 to as New LMTDThis will prevent temperature crosses, as it does in the HX.Additionally, an Extended option has been added which allows for startup / shutdown situations where heat may flow across and thru stagnant layers.Details see “UniSim Design Extended New LMTD.doc” Exposure of Compressor and Pump Curve Fit In dynamics user input curves are often then fit against an analytical expression which is then solved within the PF Solver Compressor Surge and Stonewall fit coefficients (see C:UniSimDesignB15047ToolsCompre