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In 2023, Jinxī Petrochemical Company utilized process simulation technology to continuously optimize its oil refining processes, resulting in economic benefits of over 20 million yuan last year. Jinxī Petrochemical regards the advancement of process simulation as a key element in the company’s digital transformation and intelligent development. It has established a dedicated task force consisting of 9 working groups, which carry out comprehensive plans in areas such as talent training, plan formulation, and application. Process simulation training is conducted through various methods including self-study, centralized instruction, and examination assessments. The various working groups developed 30 process simulation optimization plans in areas such as production plan research, plant operation optimization, bottleneck analysis, energy conservation and consumption reduction, equipment performance analysis, and product quality improvement, in order to maximize the efficiency of oil refining operations. Each operation department at Jinxi Petrochemical has, in light of the actual production conditions at their respective units, conducted in-depth analysis and research. By using specialized software for production simulation and by repeatedly comparing various parameters, they have carried out optimizations such as simulating the operating conditions of the C6 removal tower in the continuous reforming unit, simulating the steam consumption in the bottom reboiler of the desorption tower in the heavy oil catalysis unit, and simulating the operating conditions of the turbine in the continuous reforming unit. These efforts have helped to improve quality and efficiency, resulting in an additional monthly profit of 2.02 million yuan for the units. The Third Refining Department utilizes process simulation technology to calculate the changes in octane number, by adjusting the reaction temperature and the chlorine content of the catalyst, while keeping the feed rate to the reforming unit constant; this approach helps identify the reaction temperature that yields the highest octane number value. Following discussions and calculations by the technical improvement team, adjusting the octane number value could increase it by 0.09, while the yield of pure hydrogen could be increased by 0.04%. The optimal reaction conditions determined through simulation were put into practical use in 2023, resulting in cost savings of 6 million yuan for the company throughout that year. To date, Jinxī Petrochemical has completed the development of comprehensive basic optimization models for six sets of units, including those for north-south distillation, catalysis, and delayed coking, as well as a model for marine fuel. By utilizing China National Petroleum Corporation’s networked process simulation system platform, these models have been put into operation, providing accurate big data support for the stable operation of production processes and the formulation of APS plans. At the same time, the company developed a full-process model for the refining unit along with an Excel interface, linking the operation conditions, yields, and product quality data of various process unit models as well as the overall process model to Excel in order to create customized reports.