Modeling and control of a naphtha thermal cracking pilot plant
Modeling and control of a naphtha thermal cracking pilot plant
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DOI：
10.1021/ie050630f
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发表时间：
2006-05-10
影响因子：
4.2
通讯作者：
Towfighi, Jafar
中科院分区：
文献类型：
--
作者：
Masoumi, Miresmaeil;Shahrokhi, Mohammad;Towfighi, Jafar
为研究热裂解炉的动态行为和控制，建立了一个计算机控制的中试装置。给出了描述炉膛动态的控制方程，并基于这些方程和动力学模型，开发了模拟系统稳态行为的软件。加热炉被分成八个区域，可以独立加热，因此，可以应用任何所需的温度分布。要测量的变量是炉区温度、盘管出口温度(COT)和产品产量。采用数字比例-积分-微分(PID)控制器，采用两种不同的控制策略(即炉膛温度控制和炉膛温度控制)。结果表明，在炉壁温度控制策略中沿炉壁施加预定的温度分布，可以在较低的炉壁最高温度下获得与COT控制相同的产率。最后，基于性能指标，得到了最优的温度分布，并通过所设计的控制系统将其应用于驾驶员。
A computer-controlled pilot plant has been constructed to study the dynamical behavior and control of the thermal cracking furnace. The governing equations that describe the furnace dynamics are presented, and, based on these equations and a kinetic model, software that simulates the steady-state behavior of the system has been developed. The furnace is divided into eight zones that can be heated independently, and, therefore, any desired temperature profile can be applied. The variables to be measured are the furnace zone temperature, coil outlet temperature (COT), and product yield. Two different control strategies (namely, COT control and furnace wall temperature control) are applied using digital proportional-integral-differential (PID) controllers. The results show that, by applying a predetermined temperature profile along the furnace wall in the wall temperature control strategy, the same yield that is obtained by COT control can be achieved with the lower maximum furnace wall temperature. Finally, based on a performance index, the optimal temperature profile has been obtained and it is applied to the pilot through the designed control system.