배출수 재순환에 따른 디샌더 내부 유동 변화 CFD 해석

Effect of exhaust liquid recirculation on inner flow in a desander using CFD

The transition from carbon-based to hydrogen-based industries is now started to correspond to greenhouse gas regulations, but these changes cause economic problems. To cover the problem, it takes many times. So, efficiently utilizing the existing carbon-based industry is still important with eco-technologies. Moreover, it is also important concern to secure energy resources. Shale oil technology is one of the ways to solve the resource depletion problem, and many studies are being conducted. Desander is an important part in the process to protect major machines. In this study, the discharged liquid of a desander is sprayed directly to the lower end of the cyclone to enhance internal vortex formation and particle separation efficiency. The flow inside of the desander would be changed by the recirculated liquid and it has been analyzed by means of numerical investigation. The analysis results show that when the discharged liuid is recirculated, the internal vortex is more reliably formed comparing to non-recirculated case. This phenomenon improves the separation efficiency of solid particles at the boundary layer between the external vortex and the internal vortex. However, when the discharged water above a certain level is recycled, the region of the internal vortex occupies too large an area in the inner flow of the cyclone, which adversely affects the formation and particle separation process of the external vortex.