最新ASPEN高级培训课件PPT课件.ppt

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1、ASPEN高级培训课件LessonObjectives比较联立方程求解(EO)和序贯模块求解(SM)确定产品流股PRODUCT组成可用求解方法:序贯模块法(SM)联立方程法(EO)组合法(ofSMandEO)ATypicalSimulationProblemREACTORFEEDRECYCLEREAC-OUTCOOLCOOL-OUTSEPPRODUCTHighlyRecycledProcessesEthylenePlantSMMode:Tearstreams:PRBTMS,DECRFDFailstoconverge:PFRACandQUENCHnotinmassbala

2、nceEOMode:Convergesinthreeiterations(11sec)ProcesseswithDesignSpecificationsFCCFractionatorwithAbsorption-StrippingSystemSMMode:Threeconvergenceloops:onetearstream+twodesignspecsTearstreamfailstoconvergeEOMode:Convergesinfouriterations(45sec)ProcessOptimizationAmmoniaPlantSMMode:Maximize

3、PRODUCTstreamflow;Vary11parameters;6ConstraintsTakes7minutes(314passes)toconvergetearstreamandOptblockEOMode:MaximizePRODNH3.BLK.PRODNH3;Boundariesfor18variablesConvergesinfiveiterations(0.47sec)ProcessModelTuning估算板效率SMMode:PointdatasetofflowsTwoCalculatorblocksrequiredEstimatedvalue=0.3

4、14826EOMode:11measurements;enterPlantvaluesMinimizeSumofsquaresfunctionofcalculatedoffsetsCOLUMN.BLK.EFF_1=0.356297Plantmeasurementsincludefeedflow,temperatures,andproductcompositionsEquationOrientedModelinginAspenPlus联立方程求解步骤绘制模拟流程。定义组分，选择物性方法。提供进料流股和设备的操作参数。用SM计算方法进行变量初始化。EquationOrien

5、tedInitializationandSolution联立方程求解策略：所用变量的初值最好靠近结果。进行联立方程求解之前要用序贯模块求解进行初始化。SM求解结果可以不收敛流程中的每个模块至少要计算一次.SMStrategySolutionModes用SM求解策略,AspenPlus是单一运行模式1.Simulation:输入条件和模型参数固定，没有自由度。大多数情况可以方便求解。对于下列情况求解困难且耗时，例如：Data-Fit工具可以进行参数预估和数据协调.优化工况EOStrategySolutionModes(1)EO求解有四种模式:1.Simulation:没有自

6、由度，提供进料条件和操作参数计算产品结果。Optimization:有一定的自由度，需要构建目标函数。3.ParameterEstimation:没有自由度，进料和产品条件固定估算模型参数，对应每个估算参数需提供测量参数。Reconciliation:有自由度，需用模型计算结果与测量变量构建目标函数，并使其方差和最小化。EOVariableDefinitions变量属性：Fixed:固定变量。Free:计算变量。DegreeofFreedom(DOF):有一定自由度变量。EOVariableSpecifications(1)变量在不同运算模式下属性:Thereareoth

7、erspecificationsforMeasured,Parameterized,Reconciled,andIndependentvariablesinthefourmodes.RefertoAppendixAforacompletelist.SpecificationOptimizedCalculatedOptimizationDOFFreeFixedSimulationFixedFreeFixedConstantEOVariableSpecifications(2)四种运算模式变量属性定义:固定变量(specifica