Research And Applications On The Optimization And Blending Of Lubricating Oil System

The world petroleum industry is growing very rapidly. There has been a remarkable increase in the quantity demanded of lubricating oil in recent years. And the demand of the production quality is more stringent. Blending of lubricating oil is one of the most important processes of production system in the petroleum refineries. Great benefits can be achieved from the optimizing and blending of lubricating oil. For most of the petroleum refineries in China, the technique of manufacture is relatively backward and the method of control is still very simple. Therefore, they have lagged behind the world advanced level. The means is the advanced technique of manufacture which can be controlled and optimized with computer. The arithmetic of advanced control is requisite. For the purpose of optimizing and controlling the manufacture, we can construct the optimizing and blending of lubricating oil system. This thesis adopts that concept, develops the software of blending of lubricating oil and applies to an actual production process. The main works of the thesis are as follows:Firstly, by consulting a great quantity of scientific or technical literatures, this thesis introduces some foundation knowledge of the lubricating oil, including the state of the art of lubricating oil blending and the quality indicator of lubricating oil. Furthermore, this thesis also introduces the concept of optimal blending control (OBC). All of these lay the foundations for the following works.Then the thesis presents the function and the purpose of lubricating oil blending. It also introduces some knowledge of mechanism of mass transfer and explains the technique of manufacture in detail.At the basis of researching the mathematical model, the thesis validates the mathematical model with a large quantity of field data. After that, a new mathematical model, which is more suitable for the Chinese refineries, is developed.The thesis designs the optimizing control system of lubricating oil blending with the theory of global optimization control. This system includes four layers. The thesis describes the layer of optimizing and blending system in detail, which is the core layer in this system. By adding the mathematical model into the optimizing control system of lubricating oil blending, the system has been supported in theory effectively in the aspect of optimization and control.On the basis of the preceding works, we apply the theory to practice. This control system has been applied in a Chinese refinery. Running for a long time, the system is working normally and steadily. We collected a large quantity of field data and verified the control effect of this system. Now this project has been checked and delivered by the vendee.Finally, the works of this thesis are summarizing and making some prospects in optimizing and blending of lubricating oil system.