脱苯塔顶温度的最优控制

Optimal control of overhead temperature of debenzolization tower

为实现脱苯塔顶温度最优控制,采用等权线性最小二乘法,通过考虑时间延迟,建立了粗苯回流量与脱苯塔顶温度的线性映射数学模型。利用实时采集数据,计算出不同时间延迟情况下的最优线性拟合函数,按照误差平方和最小原则,确定时间延迟数值,进而得到不同周期内的最优线性拟合参数值。数值计算结果表明,该模型可以根据给出的回流量准确预测脱苯塔顶温度;利用最优拟合参数值确定粗苯回流量,可实现对脱苯塔顶温度的最优控制。

In order to achieve the optimal control of the overhead temperature of the debenzolization tower,based on the equal weight linear least squares method,a linear mapping mathematical model of crude benzene reflux rate and the overhead temperature of the debenzolization tower was established by considering the time delay.Using the real-time data acquisition,the optimal linear fit function was calculated for different time delays.The time delay value was determined according to the principle of minimum sum of squares of errors,and the optimal linear fit parameters in different periods were obtained.The numerical calculation results showed that the model could accurately predict the overhead temperature of debenzolization tower based on the given reflux rate.Also,optimal control of the overhead temperature of the debenzolization tower could be achieved by using the optimal fitting parameter to determine the crude benzene reflux rate.