선박평형수 살균처리기 내 구조에 따른 Membrane 유체의 혼합특성에 관한 수치해석적 연구

Abstract

When ships enter ports, they discharge ballast water. Ballast water, or seawater from foreign countries, causesmarine pollution when discharged into ports without sterilization treatment owing to the harmful marine life thatit contains. Thus, the International Maritime Organization (IMO) mandates the installation of ballast watersterilization devices to preserve marine ecosystems. This study aims to increase the generation of microbubblesby mounting a static mixer on a tube connected to a ballast tank and a three-layer membrane structure aroundthe static mixer to improve the efficiency of the electric sterilization method. Microbubble generation is expectedto increase as the pressure between the inlet and outlet of the pipe and the vorticity decrease. This study intendsto implement an optimal NaOH continuous generation system by determining the optimal seawater flow rate, bedsphere diameter, and porosity through numerical analysis. The results show that the conditions of seawater with aflow rate of 220 lph, a bed sphere diameter of 0.01 m, and a porosity of 0.3 were optimized for the NaOHcontinuous generation system.