| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 101 === Iron and steel industry turn on making every steely product and it is the basic of country reconstruction. It is called the mother of industry. For any countries, it would be considered to view as strong or weak of nation power. In order to increase production capacity on iron and steel industry in our country, the article will concentrate deeply on making iron processing. This paper aims to simulate three phases fluid flow and separation of iron and slag in main trough of the blast furnace during tapping process by means of computational fluid dynamics (CFD) technology. The physical model is based on main trough of the blast furnace no. 4 at China Steel Co. (CSC BF4). The k-εequations and volume of fluid (VOF) were used for describing turbulent flow at the impinging zone of trough and indicating liquid iron and air in the governing equation respectively. The pressure field and velocity profile were then obtained through finite volume method (FVM) and pressure implicit with splitting of operators (PISO), followed by calculating the wall shear stress through the Newton’s law of viscosity to analyze the wall shear stress profile of simulation, and comparing with the wear profile of CSC BF4 main trough to test the numerical solution. Finally, we use the mass flow rate to calculate the separation efficiency in this study. As shown in the numerical results, the thermal buoyancy results in the erosion of the main trough but its effect is lower than turbulent flow in the impinging zone. It was found that the fluid velocity in the main trough is faster, then the separation efficiency is worse; and if the height difference between iron dam and slag port is higher than about 0.2m, the separation efficiency will be an optimum. In addition, the results indicate that the height of skimmer is higher, the separation is better; if the width of the main trough is narrow, the flow field nearby slag port will produce turbulence. It can carry some iron into slag port; the angle of taphole can affect the position of impinging zone, so it can also influence result of separation efficiency.
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