IC641SWP709

IC641SWP709

IC641SWP709

IC641SWP709

IC641SWP709

　粗汽油干点的软测量的实现主要有二种方法，一种是通过读取与粗汽油干点直接有关的工艺过程数据，如分馏塔顶压力、塔顶流量、塔顶冷回流、一中回流等参数以及与此相关联的化验室分析值，

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《邮@.com》运用这些数据的相互关联性，用数学的方法建立数学模型；另外一种是采用分析分馏塔的工艺过程的工艺机理，建立的基于工艺机理的软测量模型，关于这两种方法建立的模型各有其特点，前者建模相对比较简单，但适应工况变化较差，后者建模比较困难，适应工况变化较好，关于这两者的比较将另发文探讨。本文是采用基于工艺

4　粗汽油干点的质量控制

分馏塔粗汽油干点的质量控制的实现是采用Honeywell公司的鲁棒多变量模型预测控制技术（RMPCT），首先，对已经建立的粗汽油干点的软测量点作可能影响其性能的阶跃响应试验，找出对其性质变化起控制作用的操作变量（MV），读取相关的数据，经过系统辫识，获取与粗汽油干点以及影响其性质变化的操纵变量之间的控制数学模型，而后建立相关的控制器加以实现。影响粗汽油干点的主要操纵变量为分馏塔顶温度设定值、顶循环流量、塔顶冷回流流量设定值，对反应再生系统的新鲜原料进料量、提升管出口温度、原料油预热温度、掺渣比和回炼油流量，作为干扰变量（DV）加以考虑，图2给出了粗汽油干点质量控制系统框图。其中xr为粗汽油干点设定植，x1软测量实时计算值，DV1~DV4为干扰变量。

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