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한상욱,최세영,현상훈,조철구,강한규 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.6
TiO2 membranes for microfiltration were prepared on $\alpha$-alumina support tube by slurry coating. The coating layer was obtained by flowing TiO2 slip on the inner surface of the alumina support. TiO2 membranes were heat-treated at 9$25^{\circ}C$ for 2 hrs. The thickness of the unsupported membrane was about 10${\mu}{\textrm}{m}$. The mean pore diameter of the membranes were 0.09 and 0.15${\mu}{\textrm}{m}$ respectively and the pure water flux was 900~1,200ι/m2.hr at room temperature and 1 bar. For a possible application of oily wastewater treatement an kerosene/wa-ter emulsion was separated in terms of flux and removal efficiency. In 60 min of operating time the flux of TiO2 membranes was 50~100 ι/m2.hr and removal efficiency was over 97% at 3kgf/cm2 of operating pres-sure and 600 ml/min of flow rate. TiO2 membranes could be recycled by reheat treatments at $600^{\circ}C$ for 2 hrs.
Turbo Expander Generator(TEG)를 이용한 자체기동 발전기 대체 관한 연구
한상욱,이종훈,김성렬,손다빈 대한전기학회 2022 전기학회논문지 P Vol.71 No.4
In supplying natural gas to the city, Korea Gas Corporation manufactures a TEG generator using the energy that lowers the gas pressure, and conducts research to demonstrate the application. Since TEG is a facility that generates electricity using only natural gas pressure, it is characterized by being able to generate electricity without any other special energy source. This is similar to a hydroelectric generator and can be used as a self-starting generator that is first started to recover when a power outage occurs throughout the power system. In this paper, since the location where TEG generators are currently being demonstrated corresponds to southern Gyeongin in terms of the procedure for restoring the system in the event of a power outage, we propose a plan to replace self-starting generators in southern Gyeongin with TEGs and restore the power system. Replacing the self-starting generator with TEG, confirming through simulation whether the priority starting generator can operate through the transmission line, and reflecting the characteristics of the TEG generator consisting of an induction generator, the amount of reactive power required to pressurize the transmission line and the power required to supply the priority start generator was analyzed. It was confirmed that the TEG generator can produce the same output as the self-starting generator by using the charging current charged from the trial transmission line and the additional parallel capacitor. In the future, TEG will be used not only as a self-starting generator, but also as a generator that can provide inertia to contribute to the stabilization of the power system.