Process Simulation Technology And Its Application In Continuous Reforming Unit

Continuous catalytic reforming(CCR) is one of the most important secondary processes for producing aromatic feedstock and high octane gasoline in petroleum-refining and petrochemical industries. The requirement of potentiality-tapping and profit-increasing of the CCR unit is highlighted progressively with the rapid development of the economy. The application of process simulation technology to the reforming unit, which could optimize the operating conditions, is a effective and feasible way to improve the economic efficiency. The process simulation software is becoming more and more popular in refining and petrochemical enterprises. This thesis takes the CCR unit as the research background, and the reforming kinetic, the modeling of the process and the parameter estimation are studied. Based on those work, the process simulation technology is applied to the CCR unit, and the reforming process is analyzed and optimized. A simulation platform software for CCR unit is developed. In this thesis, the main contributions are as follows.1) Based on the lumping theory and catalytic reforming reaction mechanisms, a new kinetic model involving 38 lumped components and 86 reactions is developed for the industrial CCR unit. The reaction network of the model is established according to the reaction mechanism of bi-functional catalyst and related kinetic theory. As the detailed division of the lumped components, most of the reactants' information is covered, consequently the model could be more realistic.86 model parameters are identified and a parameter estimation method, which combines the hierarchical strategy and BFGS algorithm, is given.2) On the basis of the 38-lumped kinetic model, the process simulation framework of CCR unit is built. Simulation of a refinery reformer is carried out, and fair agreement between the calculated results and the actual operating data is obtained. The result could demonstrate the reliability and accuracy of the developed model. The model is applied to predict the aromatics yield, and the result showed that (?) of the trend and precision of the aromatics yield prediction are satisfied in more than two months time. The process optimization is implemented, and an (?)rease of 0.17% on aromatics yield is obtained by a slight tuning of each inlet temperature.(?)simulation platform software for CCR unit, CataRefsim, with a friendly (?)face and simple operation features is developed based on MATLAB/GUI. The (?)ware could be used in performing steady-state simulation of the basic process (?)CCR unit, as well as sensitivity analysis and process optimization. The development of the software could provide an effective way for the research of the (?)unit's process simulation, system analysis, advanced control and (?)mization.