Abstract:

The two-stage-riser catalytic pyrolysis technology of heavy oil for maximizing propylene, features the possibility of feedstock diversification, high-yield of propylene and high-value gasoline, which enables a bright future for the related industrial applications. Modeling, nonlinear analysis, and control are important aspects for achieving high mass/energy conversion and therefore improving the competitiveness of the TMP technology. This work concentrates on the dynamic modeling for process control purpose. First, mass and energy balance models for the first riser, the second riser, the stripper, the combustor, and the dense region of the regenerator are established and connected by the spent and regenerated catalyst flow among them, forming an integrated dynamic model of the TMP process. It showed that numerical simulation of the main process variables to perturbations in potential manipulated variables not only validates the effectiveness of the set model but also presents strong interactions among two risers and the regenerator system. In total, the built model is well-suited to be adopted as a reference model for subsequent nonlinear analysis and model-based advanced control investigation.

Key words: process control, dynamic modeling, numerical simulation, catalytic pyrolysis, two-stage-riser

摘要：

两段提升管重油催化裂解多产丙烯技术具有原料适应性强、丙烯和高品质汽油产率高等优点，工业应用前景广阔。开展动态建模、非线性分析与控制等方面的研究对于揭示装置运行规律、提高能量/质量转化效率具有重要意义。从过程控制的角度出发，基于TMP工艺流程，通过合理假设，分别建立两段提升管、汽提段以及再生系统的数学模型并由循环催化剂连接形成一个整体动态数学模型。数值模拟结果表明，所建模型可以准确描述过程关键变量的动态变化趋势以及两段提升管-再生器之间的耦合关系，从而为后续非线性分析和控制系统设计创造有利条件。

关键词: 过程控制, 动态建模, 数值模拟, 催化裂解, 两段提升管