Numerical Simulation and Validation in Scrubber Wash Water Discharge from Ships
A regulation on the sulfur emissions of ships sailing in global sea areas has been enforced since 1 January 2020. In this new regulation, ships are required to use low-sulfur fuel oils or to install an after-treatment equipment, such as a scrubber. Open and hybrid scrubbers wash the exhaust gas usin...
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Format: | Article |
Language: | English |
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MDPI AG
2020-04-01
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Series: | Journal of Marine Science and Engineering |
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Online Access: | https://www.mdpi.com/2077-1312/8/4/272 |
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author | Yong-Seok Choi Tae-Woo Lim |
author_facet | Yong-Seok Choi Tae-Woo Lim |
author_sort | Yong-Seok Choi |
collection | DOAJ |
description | A regulation on the sulfur emissions of ships sailing in global sea areas has been enforced since 1 January 2020. In this new regulation, ships are required to use low-sulfur fuel oils or to install an after-treatment equipment, such as a scrubber. Open and hybrid scrubbers wash the exhaust gas using seawater and then discharge the wash water overboard. According to the regulation promulgated by the International Maritime Organization (IMO) Marine Environment Protection Committee (MEPC), the wash water must have a pH of 6.5 or higher at 4 m from the discharge point. Wash water is generally acidic, with a pH of 2.5–3.5, whereas seawater is alkaline, with a pH of approximately 8.2. The wash water is dispersed after being discharged overboard through a nozzle, and its pH is restored through dilution with the surrounding seawater. In this study, the pH was calculated by using a theoretical chemical reaction model, and then the dispersion of wash water was analyzed using CFD simulation. This study describes the process of selecting the appropriate turbulent Schmidt number in a wide range of nozzle diameters. Finally, the appropriate nozzle diameter was determined based on the initial pH of the discharged scrubber wash. |
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format | Article |
id | doaj.art-b343468ac51345da99f0edbaeaf72e12 |
institution | Directory Open Access Journal |
issn | 2077-1312 |
language | English |
last_indexed | 2024-03-10T20:33:14Z |
publishDate | 2020-04-01 |
publisher | MDPI AG |
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series | Journal of Marine Science and Engineering |
spelling | doaj.art-b343468ac51345da99f0edbaeaf72e122023-11-19T21:15:57ZengMDPI AGJournal of Marine Science and Engineering2077-13122020-04-018427210.3390/jmse8040272Numerical Simulation and Validation in Scrubber Wash Water Discharge from ShipsYong-Seok Choi0Tae-Woo Lim1Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, KoreaDivision of Marine Engineering, Korea Maritime and Ocean University, Busan 49112, KoreaA regulation on the sulfur emissions of ships sailing in global sea areas has been enforced since 1 January 2020. In this new regulation, ships are required to use low-sulfur fuel oils or to install an after-treatment equipment, such as a scrubber. Open and hybrid scrubbers wash the exhaust gas using seawater and then discharge the wash water overboard. According to the regulation promulgated by the International Maritime Organization (IMO) Marine Environment Protection Committee (MEPC), the wash water must have a pH of 6.5 or higher at 4 m from the discharge point. Wash water is generally acidic, with a pH of 2.5–3.5, whereas seawater is alkaline, with a pH of approximately 8.2. The wash water is dispersed after being discharged overboard through a nozzle, and its pH is restored through dilution with the surrounding seawater. In this study, the pH was calculated by using a theoretical chemical reaction model, and then the dispersion of wash water was analyzed using CFD simulation. This study describes the process of selecting the appropriate turbulent Schmidt number in a wide range of nozzle diameters. Finally, the appropriate nozzle diameter was determined based on the initial pH of the discharged scrubber wash.https://www.mdpi.com/2077-1312/8/4/272CFDdispersionpHturbulent Schmidt numberscrubberwash water |
spellingShingle | Yong-Seok Choi Tae-Woo Lim Numerical Simulation and Validation in Scrubber Wash Water Discharge from Ships Journal of Marine Science and Engineering CFD dispersion pH turbulent Schmidt number scrubber wash water |
title | Numerical Simulation and Validation in Scrubber Wash Water Discharge from Ships |
title_full | Numerical Simulation and Validation in Scrubber Wash Water Discharge from Ships |
title_fullStr | Numerical Simulation and Validation in Scrubber Wash Water Discharge from Ships |
title_full_unstemmed | Numerical Simulation and Validation in Scrubber Wash Water Discharge from Ships |
title_short | Numerical Simulation and Validation in Scrubber Wash Water Discharge from Ships |
title_sort | numerical simulation and validation in scrubber wash water discharge from ships |
topic | CFD dispersion pH turbulent Schmidt number scrubber wash water |
url | https://www.mdpi.com/2077-1312/8/4/272 |
work_keys_str_mv | AT yongseokchoi numericalsimulationandvalidationinscrubberwashwaterdischargefromships AT taewoolim numericalsimulationandvalidationinscrubberwashwaterdischargefromships |