An experimental study on the air pollutant emission characteristics of high-speed diesel engine for small coastal ships according to the application of the LP EGR and DOC-DPF systems
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초록
High-speed diesel engines that are widely distributed in small coastal ships discharge nitrogen oxides (NOx) and other air pollutants. In this study, experimental investigations were conducted on the possibility of treating air pollutants when applying low-pressure exhaust gas recirculation (LP EGR), diesel oxidation catalyst (DOC), and diesel particulate filter (DPF), in accordance with the expectation of stricter regulations on ship-discharged air pollution. The experiment was conducted on a high-speed diesel engine for a 500 ps ship that uses diesel and consists of an EGR system that adopts an LP method for efficient air supply and cooling effect of exhaust gas. After the LP EGR, a DOC-DPF was additionally installed in the exhaust pipe to experiment on the treatment performance of other pollutants such as carbon monoxide (CO), hydrocarbon (HC), and smoke. The study demonstrated that NOX emissions were reduced by 75.9%; from 7.56 g/kWh to 1.82 g/kWh, when LP EGR was operated at rates within the range of no output loss. This figure satisfies the International Maritime Organization (IMO) Tier III emission standard. Finally, when the DOC-DPF was additionally operated on the LP EGR, NOX emissions could be reduced to 1.83 g/kWh and smoke concentration below 1%, and HC was reduced by up to 95% and CO by up to 94%.
Abstract
High-speed diesel engines that are widely distributed in small coastal ships discharge nitrogen oxides (NOx) and other air pollutants. In this study, experimental investigations were conducted on the possibility of treating air pollutants when applying low-pressure exhaust gas recirculation (LP EGR), diesel oxidation catalyst (DOC), and diesel particulate filter (DPF), in accordance with the expectation of stricter regulations on ship-discharged air pollution. The experiment was conducted on a high-speed diesel engine for a 500 ps ship that uses diesel and consists of an EGR system that adopts an LP method for efficient air supply and cooling effect of exhaust gas. After the LP EGR, a DOC-DPF was additionally installed in the exhaust pipe to experiment on the treatment performance of other pollutants such as carbon monoxide (CO), hydrocarbon (HC), and smoke. The study demonstrated that NOX emissions were reduced by 75.9%; from 7.56 g/kWh to 1.82 g/kWh, when LP EGR was operated at rates within the range of no output loss. This figure satisfies the International Maritime Organization (IMO) Tier III emission standard. Finally, when the DOC-DPF was additionally operated on the LP EGR, NOX emissions could be reduced to 1.83 g/kWh and smoke concentration below 1%, and HC was reduced by up to 95% and CO by up to 94%.
참고문헌 (13)
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