스크러버 세정수 배출 규제에 따른 노즐 직경 설계에 관한 연구
Designing of nozzle diameter based on the IMO regulation for discharging scrubber wash-water
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초록
본 연구에서는 IMO 규정에 따라서 선박의 스크러버 세정수의 pH 회복을 위한 노즐 직경 설계에 관한 수치해석적 연구를 수행하였다. 선박의 스크러버 세정수는 배출지점으로부터 4m에서 pH 6.5 이상이 되어야 한다고 규정되어있다. 이론적인 산-염기 화학반응을 이용하여 적정 곡선을 구하고 pH 6.5 일 때의 희석비 및 체적 분율을 계산하였다. 그리고 CFD 확산 해석을 수행하여 배출 속도와 노즐 직경 변화에 따른 체적 분율을 계산하였다. 해석결과에 의하면 배출 속도는 확산에 큰 영향을 미치지 않는 것으로 나타났으며, 노즐의 직경이 확산에 영향을 미치는 주요 변수로 나타났다. 수치해석 결과를 토대로 희석비에 따라서 배출지점으로 4m 에서 pH 6.5가 되는 노즐 직경을 예측하는 상관식을 제안하였다.
Abstract
In this study, numerical analysis was conducted for designing nozzle diameters to recover the pH value of scrubber wash-water of ships in accordance with the IMO (International Maritime Organization) regulation. It is prescribed that the scrubber wash-water should attain a minimum pH value of 6.5 at a distance of 4 m from the discharge point. By employing theoretical acid-alkali chemical reactions, titration curves were obtained, and the dilution ratio and volume fraction were calculated at the pH value of 6.5. Subsequently, CFD diffusion analysis was conducted for calculating the volume fraction with respect to various discharge velocities and nozzle diameters. The obtained analysis results indicated that the discharge velocity marginally affected the diffusion process, whereas the nozzle diameter significantly affected the diffusion process. Furthermore, based on numerical results, a correlation was developed according to the dilution ratio for predicting the nozzle diameter required for attaining a pH value of 6.5 at a distance of 4 m from the discharge point.
참고문헌 (12)
- "MEPC 70/18/Add.1 ANNEX6, Effective date of implementation of the fuel oil standard in regulation 14.1.3 of MARPOL ANNEX VI" (2016)[URL]
- A. Armellini, "Evaluation of gas turbines as alternative energy production systems for a large cruise ship to meet new maritime regulations", Applied Energy, 211, pp.306~317 (2018)
- A. Halff, "The likely implications of the new IMO standards on the shipping industry", Energy Policy, 126, pp.227~286 (2019)
- L. Jiang, "The costs and benefits of sulphur reduction measures : Sulphur scrubbers versus marine gas oil", Transportation Research Part D : Transport and Environment, 24, pp.19~27 (2014)
- H. L. Bell, "Preliminary studies on the tolerance of aquatic insects to low pH", Journal of the Kansan Entomological Society, 42(2), pp.230~236 (1969)
- IMO, "Res. MEPC. 259(68), Exhaust Gas Cleaning System Guidelines", ~ (2015)
- H. Ulpre, "Turbulent acidic jets and plumes injected into an alkaline environment", Journal of Fluid Mechanics, 734, pp.253~274 (2013)
- H. Ulpre, "Environmental policy constraints for acidic exhaust gas scrubber discharges from ships", Marine Pollution Bulletin, 88(1-2), pp.292~301 (2014)
- T. G. Thompson, "The buffer capacity of sea water", Industrial and Engineering Chemistry Analytical Edition, 3(4), pp.393~395 (1931)
- M. Eigen, "Methods for investigation of ionic reactions in aqueous solutions with half-times as short as 10-9 sec. Application to neutralization and hydrolysis reactions", Discussions of the Faraday Society, 17, pp.194~205 (1954)
- "ANSYS CFX-Tutorials, V17.0", ~ (2016)
- B. S. Pani, "Turbulent jets: point-source and CFD simulation results", Journal of Environmental Research and Development, 5(4), pp.952~959 (2011)