间歇精馏模型BatchFrac事例用于模拟丙酮和水说明书.doc

间歇精馏模型BatchFrac事例用于模拟丙酮和水说明书(1) BatchFrac模型简介BatchFrac 是一个用于间歇蒸馏的单元操作模型，它是模拟多级间歇蒸馏塔的一个严格的模型。BatchFrac 用一种十分有效的算法来求解非稳态的描述间歇蒸馏过程的热平衡方程和物料平衡方程，在每个平衡级上都提供了严格的热平衡物料平衡和相平衡关系。BatchFrac 能够处理各种间歇蒸馏问题包括以下系统：l 窄沸程l 宽沸程l 高度非理想系统l 三相系统l 反应系统BatchFrac能够检测冷凝器中游离水的存在或者是塔中任意位置的第二液相的存在，BatchFrac在模拟级间倾析器时具有很大的灵活性，BatchFrac可以模拟带有平衡或速度控制的反应的间歇蒸馏塔这些反应可以发生在任意一个平衡级上包括再沸器和冷凝器。BatchFrac模型假定：l 使用平衡级但你可以规定汽化率l 有连续的液体滞留且没有气体滞留l 不模拟塔水力学(2) BatchFrac模型输入规定BatchFrac塔板是从上往下计算的，起始于冷凝器。其精馏过程是一个连串的顺序操作过程，BatchFra的第一个操作步骤是进行全回流运算。BatchFra有两种形式的数据输入规定：l Column setup(塔设置)l Column operation(塔操作) Column setup(塔设置)Setup specifications define the column you are modeling, but they do not define its operation. These specifications include:Number of stages、Column holdup profile、Pressure profile、Initial charge、Final product specificationsYou can choose to specify these on the BatchFrac Setup Form:Interstage heaters and coolersHeat-loss profileThree-phase distillation and decantersVaporization efficiencyReactions and property options for column segmentsAll Column Setup specifications, except for the initial feed and final charge, can be overridden during any subsequent operation step. You can also request the simulation to record result profiles other than the default at the Setup level. You can set specific block options, algorithm convergence parameters, and diagnostic levels. You can specify user subroutines for pressure profile calculation and reboiler heat duty calculation.You must specify On this sheetTotal number of stages Setup ConfigurationColumn holdup profile Setup HoldupColumn pressure profile Setup PressureInitital charge stream and final outlet streams Setup Charge/Products Column operation(塔操作)Column operation specifications define the operating conditions of the column during an operation step. They include operating specifications such as reflux ratio and distillate rate, and stop-criterion information. You can choose to specify intermediate charges to the reboiler, continuous feeds, sidedraws, and intermediate dumps at the operation step level. You can override some global specifications at the operation step level. Other specifications depend on the column configuration and algorithm being used.详细的输入设置和浏览结果窗体如下表。窗体用途Setup规定塔基本构造和操作条件Operation Steps规定不同操作步骤的塔操作条件以及浏览结果Heaters Coolers规定塔板加热或冷却Efficiencies规定板、组分或段效率Reactions规定平衡、动力学和转化反应的参数Properties规定塔节物理性质参数Estimates输入估计板初始温度、汽液流量和组成Convergence确定塔计算的收敛因子和阻碍诊断信息标准Records规定在模拟过程中塔板数可变性Report规定模块的报告选项User Subroutines用户子程序规定压降和再沸器热量Block Options规定全局变量（如物理性质、模拟选项、诊断信息标准和报告形式）对某一模块的有效性ResultsSummary浏览塔关键结果SnapshotResults浏览塔构造和操作规定结果Profiles浏览所有塔板结果TimeProfiles浏览塔参数随时间变化RecordPofiles浏览规定的塔板参数RecordTimeProfiles浏览规定的塔参数(3) BatchFrac事例丙酮与水的分离。进料：25，1.051atm，3200kg/h，组成：丙酮0.99，水0.01由于是间歇精馏，因此釜液的进料量为一定量，等于total flow