Modeling Of Delayed Coking Unit And Simulation Training System

With crude oil quality being worse and the demand of the light fuel oil increasing rapidly, delayed coking unit plays an important role in the oil refining industry. On the background of the simulation training project of the 140×10 4t y delayed coking unit of Beijing Yanshan Refinery, the study on modeling of the unit and simulation training system is performed. The main work of the dissertation can be summarized as follows:According to reaction mechanism, a novel six-lumping kinetic model of delayed coking is proposed, whose reaction kinetic parameter k integrates furnace outlet temperature, reaction pressure, recycle ratio, residua character four main process factors. Then the dynamic model of delayed coking reaction in the coke drum is developed based on the proposed kinetic model and some hypothesis. Simulation studies are performed and the influences are analyzed. The simulation results show good agreement with the industrial process mechanism. In order to describe the oil trap structure of the main fractionating tower, the basic tray model is improved by embedding oil trap model.Considering the needs of the training simulation system and the characteristics of startup procedure of delayed coking unit, a dynamic model for simulation training purposes is developed, which can be applied to describe both the routine operation and the startup process of the unit. The simulation results are consistent with the mechanism of the startup procedure. In the training simulation system, typical unit accidents and the ESD/SIS actions are also simulated. The operations evaluation system is developed to judge operators'performance. The simulation training system has been put into use in Beijing Yanshan Refinery, and it will help guarantee the success of startup of the unit.