Analysis and Decomposition for Improved Convergence of Nonlinear Process Models in Chemical Engineering

作者：Bublitz Saskia^*; Esche Erik; Tolksdorf Gregor; Mehrmann Volker; Repke Jens Uwe

来源：Chemie Ingenieur Technik, 2017, 89(11): 1503-1514.

DOI：10.1002/cite.201700041

• Decomposition
• Equation-oriented
• Nonlinear systems
• Process simulation

Solving nonlinear equation systems as they occur in process simulation simultaneously, often fails due to ill-conditioned models or bad initialization. To counteract these issues two methods have been implemented in the web-based platform MOSAICmodeling. The Dulmage-Mendelsohn algorithm forms a block diagonal Jacobian matrix. In addition, the bordered block transformation identifies variables that need to be carefully initialized due to their great influence on the system. Both methods are applied on two process models and their convergence and sensitivity towards initialization is analyzed.

• 出版日期2017-11