Study on Introduction of Phenomenological Dynamics into Concept of Chemical Engineering Design

将唯象动力学引入化工设计理念的研究

• 批准号: 12355031
• 负责人: KATAOKA Kunio
• 金额: $ 28.08万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12355031/
• 关键词: Chemical engineering design methodology; Nonlinear dynamics; Neural networks; Virtual reactor; Mixing characteristics; Multiphase flow; Dynamic reaction operation; Emulsion Polymerization; 複雑系化学プロセス; 動的設計・操作法; 履歴性・分岐性; カオス混合; 混相流反応装置; モデリング /

The methodology of design of systems, operation and control for realizing various complex chemical processes involving nonlinear dynamics was investigated by the following seven research project teams:(A) Dynamics of emulsion polymerization of vinyl acetate was investigated comparing between batch and continuous flow operations. Intermittent oscillations of particle size distribution (PSD) were found in the 2^<nd> stage of continuous flow operation due to precipitative aggregation of 1^<st> particles to 2^<nd> particles. Key control parameters, e.g. emulsifier concentration were extracted to control the particle size distribution of latex particles and molecular weight distribution of vinyl acetate polymers.(B) Various modeling methods for complex chemical processes were investigated utilizing various neural networks in order to construct an intelligent system technology for prediction of dynamic behavior and optimization for design, control and operation. Some effective modeling metho … More ds, e.g. hybrid model consisting of both ordinary and partially differential equation models were proposed to apply to dynamic simulation of various chemical systems such as the startup operation of a polymerization reactor.(C) Various dynamically-fluctuating physical data of multi-phase flow reactors were experimentally accumulated to construct several database based on a concept of virtual reactor design methodology. It has been demonstrated that time-series data of turbulent velocity and temperature fluctuations can be reconstructed by neural networks applied to the databases and be superimposed on the macroscopic flow structures numerically obtained by CFD simulation.(D) How to model the fluid mixing behavior from a viewpoint of nonlinear dynamics was investigated to invent a novel mixer. The simulation method was demonstrated to indicate the effective mixing characteristics of a reciprocating circular disk installed in a cylindrical vessel. Three-dimensional space-time velocity data of turbulent flows in a stirred tank reactor were accumulated to construct a database and a graphic system was made to reconstruct a virtual turbulent flow for demonstration of the mechanism of mixing.(E) Chemical oscillations in complex chemical reaction processes, dynamic behavior of heat integrated distillation columns, and mass transport in a macromolecule membrane were both experimentally and numerically investigated from a common viewpoint of how to introduce the dynamic data observable in various real chemical process systems into chemical engineering design methods.(F) A dynamic operation method and reactor structure design were experimentally investigated to enhance an overall rate of catalytic reaction. It has been found that a periodical spray of reactant liquid is a key operation controlling the surface renewal effect on a catalyst plate.(G) A visualization and observation technique of bubble flow dynamics was developed for a purpose of dynamic design of gas-liquid reaction processes. A very complicated motion and dynamic deformation of a single bubble were successfully observed by the technique. An evaluation method for reliability of analysis of dynamic bubble characteristics was also proposed. Less

以下七个研究项目团队研究了实现各种涉及非线性动力学的复杂化工过程的系统设计、操作和控制的方法学：(A)对间歇和连续流动操作下的醋酸乙烯乳液聚合动力学进行了研究。在连续流操作的第2阶段，由于1^t；st&gt；颗粒向2^lt；d&gt；颗粒的沉淀聚集，颗粒大小分布(PSD)出现间歇性振荡。提取关键控制参数，如乳化剂浓度，以控制乳胶粒子的粒度分布和醋酸乙烯酯聚合物的分子量分布。(B)利用各种神经网络研究复杂化工过程的各种建模方法，以构建用于动态行为预测和设计、控制和操作优化的智能系统技术。几种有效的…建模方法(C)基于虚拟反应器设计方法的概念，通过实验积累了多相流反应器的各种动态脉动物理数据，建立了多相流反应器的数据库。将神经网络应用到数据库中，可以重建湍流速度和温度波动的时间序列数据，并将其叠加到CFD数值模拟得到的宏观流动结构上。(D)从非线性动力学的角度研究了如何对流体混合行为进行建模，以发明一种新型的混合器。用该方法模拟了圆柱形容器内往复圆盘的有效混合特性。对搅拌釜式反应器内湍流的三维时空速度数据进行了采集，建立了数据库，并制作了图形系统来重建虚拟湍流，以演示混合机理。(E)从如何将各种实际化工过程中可观察到的动态数据引入化工设计方法的共同角度，对复杂化学反应过程中的化学振荡、热集成精馏塔的动态行为以及高分子膜中的质量传递进行了实验和数值研究。(F)为提高催化反应的总体速率，对动态操作方法和反应器结构设计进行了实验研究。研究发现，反应液体的周期性喷雾是控制催化板表面更新效果的关键操作。(G)发展了气泡流动动力学的可视化和观测技术，用于气液反应过程的动态设计。该技术成功地观测到了单个气泡非常复杂的运动和动态变形。提出了动态气泡特征分析可靠性的评价方法。较少

项目成果

H.Matsumoto: "Modularized Neural Network Modeling of GFC Fractionation Process"Proc.of International Conference EANN'01. 31-38 (2001)

H.Matsumoto：“GFC 分馏过程的模块化神经网络建模”Proc.of International Conference EANN01。

M.Abe: "Design of a pH Controller Using a Neural Network Optimized by Genetic Algorithm"Proc.5^<th> International Conf. on Knowledge-Based Intelligent Information Engineering Systems & Allied Technologies KES'2001. 622-626 (2001)

M.Abe：“使用遗传算法优化的神经网络设计 pH 控制器”Proc.5^<th> 国际会议。

倉本 浩司: "連続単一気泡流れにおける気泡周りの微視的流れ構造"化学工学論文集. 27-4. 466-469 (2001)

Koji Kuramoto：“连续单气泡流中气泡周围的微观流动结构”《化学工程杂志》27-469（2001）。

W.Chen: "Nonlinear Modeling of the Dynamic Behaviors in Three-Phase Reactors Using Artificial Neural Networks"4^<th> International Conference on Multiphase Flow (ICMF'2001), New Orleans, May 27-Jun.1. (CD-ROM). 444 (2001)

W.Chen：“使用人工神经网络对三相反应器动态行为进行非线性建模”第 4 届多相流国际会议 (ICMF2001)，新奥尔良，5 月 27 日至 6 月 1 日。

Y.Komoda: "Characteristics of Turbulent Flow Induced by Reciprocating Disk in Cylindrical Vessel"Journal of Chemical Engineering, Japan. 34-7. 929-935 (2001)

Y.Komoda：“圆柱形容器中往复盘引起的湍流特性”日本化学工程学报。