Effective Control of SOx and NOx Release to the Atmosphere from Emissions of Ship Propulsion Engines

Kamil, Salim; Muslim, Mazlan; Saat, Asmalina Mohamed

doi:10.1007/978-981-15-0002-2_10

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…In an SCR system, ammonia from decomposition reacts with NO and NO 2 from the exhaust gases. The three primary reactions are expressed in the following equations [25,41]:…”

Section: No X Reduction Reaction Modelmentioning

confidence: 99%

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Numerical Study on Compact Design in Marine Urea-SCR Systems for Small Ship Applications

Choi,

et al. 2023

Energies

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With increasingly stringent emissions legislation, such as that stipulated by the International Maritime Organization, for nitrogen oxide emission reduction in marine diesel engines, the imperative of curtailing nitrogen oxide emissions from marine diesel engines is intensifying. Consequently, the significance of aftertreatment technologies, including diesel particulate filters (DPFs) and selective catalytic reduction (SCR), is poised to grow substantially. In particular, a redesign is required to reduce the size of DPF and SCR systems for application in small ships. In this study, we varied the shape of the filters in DPF and SCR systems, aiming to achieve a distinct flow pattern and enable overall miniaturization. The performance metrics, including the nitric oxide (NO) reduction rate, NH3 slip rate, and pressure drop, of the redesigned models were compared with those of the conventional model. Computational fluid dynamics simulations were used to compare the performance of the redesigned model with that of the conventional model in terms of NO reduction and pressure drop. The redesigned system achieved a NO reduction rate of 6.9% below that of the conventional system, offering additional noteworthy benefits such as a 50% reduction in both pressure and overall length.

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“…In an SCR system, ammonia from decomposition reacts with NO and NO 2 from the exhaust gases. The three primary reactions are expressed in the following equations [25,41]:…”

Section: No X Reduction Reaction Modelmentioning

confidence: 99%

“…SCR in particular can achieve a NO x reduction rate of 80-90% and has been recognized as a standard method for satisfying regulatory requirements [7,24]. According to Kamil et al [25], NO x emissions from cars in 27 European countries have been dramatically reduced. By contrast, NO x emissions from marine ships have been increasing slowly.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Compact Design in Marine Urea-SCR Systems for Small Ship Applications

Choi,

et al. 2023

Energies

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“…In 27 countries of Europe, while pollutant emissions from cars seem to decrease, ships' emissions continuously increase. It is characteristic that from 2000 to 2020, ships' NO x and SO x emissions increased by about 40% [13]. As a consequence of the above, the designers of marine Diesel engines, in recent years, have had to deal with the strictest emission limits of harmful pollutants.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Sustainability of the Most Prominent Type of Marine Diesel Engines under the Implementation of the EEXI and CII Regulations

Polemis,

Boviatsis,

Chatzinikolaou

2023

Clean Technol.

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The wide spread of the Diesel engine has been instrumental in the development of modern shipping. Marine Diesel engines dominate today as an option for the propulsion of commercial ships. While replacing Diesel engines with alternative propulsion engines is difficult to achieve, companies, in light of the new EEXI regulations, are turning to improvements, such as operating at lower rotational speeds, higher maximum combustion pressures, and more efficient overcrowding systems. Τhe purpose of this research paper is (i) to present the basic operating principles of marine Diesel engines, (ii) to study the main differences between electronically controlled Diesel engines and their mechanically controlled counterparts, and (iii) to evaluate their performance under newly introduced IMO’s EEXI regulations. Thus, after comparing Wärtsilä RTA and WinGD WX, the paper concluded that WinGD WX, being electronically controlled, will perform more effectively under new EEXI regulations, as it offers (i) reduced fuel consumption in low-load mode, (ii) zero-smoke emission at all operating speeds, (iii) very stable operation at low speed, (iv) more straightforward engine setup leading to less maintenance, (v) more extended periods between maintenance, mainly due to better load distribution between cylinders and more perfect combustion. From a regulatory perspective, the new limitations installed by the newly implemented EEXI and CII regulations will cause fewer implications in electronically controlled engines, while from an economic standpoint, the electronically controlled engines decrease OPEX and require fewer personnel, due to their efficiency at low loads and overall flexibility.

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“…LSFO can continue to use existing marine diesel engines and reduce Sox emissions to acceptable levels without scrubber systems. However, LSFO incurs a 50% higher cost in the refining process, and the fines for catalysts for engines using LSFO are also increased, making it much less economical than the scrubber system [1].…”

Section: Introduction 1background Of Scrubber Systemsmentioning

confidence: 99%

Hybrid Multi-Criteria Decision-Making for Marine SOx Scrubber Systems

Jee

2022

JMSE

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This paper aims to identify the best solution for three SOx scrubber systems by evaluating their economic, environmental and technical performances: open-loop, closed-loop and hybrid scrubber systems. It adopted a novel muti-criteria decision-making model which can be introduced as the combination of lifecycle cost and lifecycle assessments, and fuzzy-TOPSIS and fuzzy-AHP. The analysis results of the case study of 72,100 gross-ton cargo ships suggested that the closed-loop scrubber systems would be the most effective in the consideration of all of the aspects, overall. It also shows the excellence of the proposed decision-making model to remedy the shortcomings of the conventional multi-criteria decision-making process by directing the analytic process in a wiser way, by means of fuzzy elements. For the environmental impact assessment, the lifecycle assessment approach enables one to obtain a holistic view of the Lifecycle emissions from the cradle to the grave. This paper finally shows the effectiveness of the proposed method, which can improve confidence in decision-making by extending a short-term view widely. Therefore, it was strongly believed that the proposed model is not necessarily/limitedly applied to marine systems but can be broad and noteworthy for a variety of studies requiring appropriate decision-making.

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Effective Control of SOx and NOx Release to the Atmosphere from Emissions of Ship Propulsion Engines

Cited by 7 publications

References 2 publications

Numerical Study on Compact Design in Marine Urea-SCR Systems for Small Ship Applications

Numerical Study on Compact Design in Marine Urea-SCR Systems for Small Ship Applications

Assessing the Sustainability of the Most Prominent Type of Marine Diesel Engines under the Implementation of the EEXI and CII Regulations

Hybrid Multi-Criteria Decision-Making for Marine SOx Scrubber Systems

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