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선박평형수 살균처리기 내 Membrane 구조에 따른 유체의 혼합특성에 관한 수치해석적 연구
정은익(Eun-Ik Jeong),성동민(Dong-Min Seong),김태화(Tae-Wha Kim),박상진(Sang-Jin Park),서정세(Jeong-Se Suh) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.2
When ships enter ports, they discharge ballast water. Ballast water, or seawater from foreign countries, causes marine pollution when discharged into ports without sterilization treatment owing to the harmful marine life that it contains. Thus, the International Maritime Organization (IMO) mandates the installation of ballast water sterilization devices to preserve marine ecosystems. This study aims to increase the generation of microbubbles by mounting a static mixer on a tube connected to a ballast tank and a three-layer membrane structure around the static mixer to improve the efficiency of the electric sterilization method. Microbubble generation is expected to increase as the pressure between the inlet and outlet of the pipe and the vorticity decrease. This study intends to implement an optimal NaOH continuous generation system by determining the optimal seawater flow rate, bed sphere diameter, and porosity through numerical analysis. The results show that the conditions of seawater with a flow rate of 220 lph, a bed sphere diameter of 0.01 m, and a porosity of 0.3 were optimized for the NaOH continuous generation system.
선박평형수 살균처리기 내 고정 혼합기 형상에 따른 유체의 혼합특성에 관한 수치해석적 연구
정은익(Eun-Ik Jeong),박상진(Sang-Jin Park),김태화(Tae-Wha Kim),서정세(Jeong-Se Suh) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.5
Ballast water refers to seawater loaded into ballast tanks to balance ships. To prevent marine pollution, the sterilization of ballast water in ships is essential. The methods for sterilizing ballast water include chemical and electrolytic treatments, as well as other methods. The purpose of this study was to improve the efficiency of the electric sterilization method by varying the cross-junction and twisting number of the static mixer elements to investigate their effects on pressure drop and mixing. As a result, when the twisting number of static mixers was high, the shape of the cross-junction static mixer elements yielded a higher pressure drop than that of the continuously bonded elements but with a lower vorticity. When the twisting number of the static mixer was low, there was no significant change in the pressure drop or vorticity, regardless of whether the elements were crossed. Because it is believed that the pressure drop will have a greater impact than vorticity on the mixing of seawater within the pipe, a static mixer with a high twisting number and cross-junction elements is considered the most suitable shape.
김경수(Kyoung Su Kim),방세경(Se Kyoung Bang),정은익(Eun Ik Jeong),이중섭(Chung Seob Yi) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
This study is collects design data through the process design of the organic Rankine cycle, which can produce 20kW of electric power through the recovery of waste heat. In this study, the simulation was conducted by using APSEN HYSYS in order to make the model for the process design of the 20kW class waste heat recovery system. For the thermodynamic model, the test was conducted with hot water as the heat source, with the water steam used as the cooling water for the cooler and the refrigerant R245fa in the cycle. In Case 1 and Case 2, it was expected and found that the cycle efficiency was 10.6% and that 36.86kw was produced, considering the margin of 84% of 20kW. In Case 3 and Case 4, it was expected and found from the simulation that the cycle efficiency was 12% and that 30.0kw was produced, considering the margin of 84% of 20kW.
김경수(Kyoung Su Kim),방세경(Se Kyoung Bang),서인호(In Ho Seo),이상윤(Sang Yun Lee),정은익(Eun Ik Jeong),이중섭(Chung Seob Yi) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.5
This study aims to gain the design data through the process design of the organic Rankine cycle, which can produce 250kW of electric power through waste heat recovery. In this study, a simulation was conducted using APSEN HYSYS to make the model for the process design of the 250kW-class waste heat recovery system. For the thermodynamic model, the test was conducted with hot water as the heat source, the water steam as the cooling water for the cooler, and the refrigerant R245FA in the cycle. In the final design, it was expected and found from the simulation that the cycle efficiency was 12.62% and that 250kW of power was produced considering the margin of 80%.