Combustion Characteristics of MDO and MDO Emulsion in Automotive Diesel Engine

2018

Energies

Compression ignition engines used as marine engines are the most efficient internal combustion engines. They are well-established products, and millions are already on the market. Water-in-MDO (marine diesel oil) emulsions are the best alternative fuel for compression ignition engines and can be utilised with the existing setup of 2.0 L automotive common rail direct injection (CRDI) engines. They have benefits for the simultaneous reduction of both NOx and smoke (black carbon). Furthermore, they have a significant impact on the improvement of combustion efficiency. Micro-explosions are the most important phenomenon of water-in-diesel emulsions inside an internal combustion engine chamber. They affect both the emission reduction and combustion efficiency improvements directly and indirectly in accordance with the brake mean effective pressure (BMEP) and rpm. Owing to the influence of micro-emulsions on the combustion and emissions of water-in-diesel emulsion fuel, the reduction ratios of NOx and smoke in a used engine are approximately 30% and 80%, respectively. The effect of the operating parameters on micro-emulsions is presented.

Section: Introductionmentioning

confidence: 99%

Study on Combustion and Emission Characteristics of Marine Diesel Oil and Water-In-Oil Emulsified Marine Diesel Oil

Kim

2018

Energies

“…Figure 1 shows that the SCR is currently the only technology capable of meeting the tier III NOx regulations for marine engines. The research to reduce NOx and smoke emission have been performed through the simultaneous reduction of NOx and smoke using the combustion method of water-in-water emulsion [16,17], fuel change, exhaust gas recirculation (EGR) [18][19][20], and engine modification [21][22][23] in relation to NOx emission regulations. As a technology to reduce NOx, SCR [24,25] is actively being applied to marine diesel engines and the related developing technologies.…”

Section: Of 13mentioning

confidence: 99%

SCR Performance Evaluations in Relation to Experimental Parameters in a Marine Generator Engine

Kim

2019

JMSE

Many researchers have conducted experiments on the position and nozzle conditions in the exhaust pipe of a stage/swirl mixer, as well as the injection position required to satisfy the International Maritime Organisation (IMO) regulations. In this study, an SCR (Selective catalytic reduction) system was designed through basic and detailed designs. The performance of the components was verified through a single-component performance test for the detailed design components, and the total nitrogen oxide (NOx) reduction efficiency was predicted using the proven system. Subsequently, the system was applied to an actual engine, and the performance was verified according to the engine operating conditions using the experimental variables. The NOx reduction rate and NH3 slip characteristics in relation to MCR (Maximum Continuous Rating) conditions using the optimised SCR system indicate that the NOx reduction rate exceeds 80% in all MCR conditions. Finally, the SCR system developed in this study proves that the performance of the SCR system satisfies the IMO regulatory requirements.

“…Figure 1 illustrates that selective catalyst reduction (SCR) is the only technology currently available to achieve compliance with the Tier III NO x regulations of the International Maritime Organization (IMO) 1,13 for all applicable engines. In particular, many researchers have studied methodologies such as water-in-oil emulsion, 2,3 fuel changing, exhaust gas recirculation (EGR), [4][5][6] and basic engine modifications [7][8][9] with respect to controlling NO x emissions. As a technology for reducing NO x , SCR 10,11 has been recommended for marine diesel engines.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of a urea-selective catalytic reduction system in a marine diesel engine

Proceedings of the Institution of Mechanical Engineers, Part M:

2016

A numerical simulation of the droplet distribution at the exhaust duct for a static mixer and injection location was performed for marine selective catalyst reduction. Through experiments with this auxiliary marine urea-selective catalyst reduction system, the ammonia slip, selective catalyst reduction system pressure drop, and NO x reduction rate in accordance with the space velocity (i.e. engine load) were investigated. Under incremental and random experimental conditions, the ammonia slip of this urea-selective catalyst reduction system is below 3 ppm, which satisfies International Maritime Organization Tier III regulations.