발전소 해수배관 내부 피복재 손상방지 방안 연구
A Study on Damage Prevention to the Coating Material Inside the Seawater Piping of Power Plant
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초록
In this study, by using a system analysis program(Fluid Flow), the correlation between the location where cladding damage occurs frequently inside the power plant seawater pipe and flow characteristics is analyzed, and the root cause and improvement plan are reviewed. As a result, it was confirmed that a high flow velocity occurred in the backwash piping(7.64m/s) and the front and rear ends of the flow control valve(5.93m/s). In addition, it was confirmed that cavitation occurs when the seawater level decreases below the saturated water vapor pressure at the rear end of the orifice. These areas are locations where the internal cladding damage occurs frequently in power plants, and the main cause of damage is considered to be excessive flow velocity and cavitation in the pipe. In order to solve this problem, improvement method such as installation of backwash pipe orifices, change of pipe shape at the front and rear end of flow control valve, and change of orifice type were derived.
Abstract
In this study, by using a system analysis program(Fluid Flow), the correlation between the location where cladding damage occurs frequently inside the power plant seawater pipe and flow characteristics is analyzed, and the root cause and improvement plan are reviewed. As a result, it was confirmed that a high flow velocity occurred in the backwash piping(7.64m/s) and the front and rear ends of the flow control valve(5.93m/s). In addition, it was confirmed that cavitation occurs when the seawater level decreases below the saturated water vapor pressure at the rear end of the orifice. These areas are locations where the internal cladding damage occurs frequently in power plants, and the main cause of damage is considered to be excessive flow velocity and cavitation in the pipe. In order to solve this problem, improvement method such as installation of backwash pipe orifices, change of pipe shape at the front and rear end of flow control valve, and change of orifice type were derived.
참고문헌 (3)
- Jon-Man Han, "A Study on Corrosion Behavior of Coated Steel Pipes for Seawater Service", J. Corros Sci. Soc. of Korea, 26(1) (1997)
- 송윤호, "오리피스 형상에 따른 단공노즐 액체제트의 유동특성", 한국추진공학회지, 21(5), pp.19~28 (2017), 한국추진공학회
- Schmidt, D.P., "Analytical Prediction of the Exit Flow of Cavitation Orifices", Atomization and Sprays, 7(6), pp.603~616 (1997)