基于MATLAB回归的催化裂化粗汽油干点模型

Dry point model of FCC naphtha based on MATLAB regression analysis

在催化裂化装置开停工过程或降低处理量操作过程中,往往由于处理量的变化而难以确定分馏塔顶温度,易造成粗汽油干点不合格。将分馏塔顶油气假设成一种纯组分,收集大量过往操作和分析数据,利用MATLAB软件拟合回归出粗汽油干点的经验计算公式。经检验,该公式具有较好的拟合性,误差均在±1.6℃内。在此基础上计算得出:分馏塔顶温度每升高1℃,粗汽油干点相应变化0.85℃左右;同样的条件下,粗汽油干点每升高1℃,分馏塔顶温度相应提高1.17℃左右。该经验公式可作为确定粗汽油干点的辅助依据。

In the process of start-up and shut-down of FCCU or reduction of treatment capacity,it is often difficult to determine the top temperature of fractionator due to the change of treatment capacity,which is easy to cause the unqualified dry point of naphtha.The oil and gas on the top of fractionator is assumed to be a pure component.After collecting a large number of past operation and analysis data,the empirical formula for regression of dry point of naphtha is fitted by MATLAB software.The results show that the formula has a good fit,and the verification error is within±1.6℃.On this basis,it is calculated that the top temperature of the fractionator increases by 1℃,and the dry point of the naphtha changes by about 0.85℃;under the same conditions,the dry point of the naphtha increases by 1℃,and the top temperature of the fractionator increases by about 1.17℃.The empirical formula can give operators a way to determine the dry point of naphtha and an auxiliary basis.