Energy efficiency improvement strategies for a diesel engine in low-temperature combustion

Zheng, Ming; Asad, Usman; Reader, Graham T.; Tan, Yuyu; Wang, Meiping

doi:10.1002/er.1464

Cited by 79 publications

(27 citation statements)

References 28 publications

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“…However, it is necessary to point out that these methods can lead to unstable fuel combustion [Zheng et al, 2009]. As it is known, fuel is injected into the cylinder of the diesel engine at some advance angle (at the moment when the piston is not yet at the top dead center), which reduces the temperature at the end of compression in a real cycle as compared to a similar value for an ideal (theoretical) cycle.…”

Section: Literature Review / Pregled Literaturementioning

confidence: 99%

The Use of Exhaust Gas Recirculation for Ensuring the Environmental Performance of Marine Diesel Engines

Sagin¹,

Kuropyatnyk²

2018

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SummaryThe article deals with the operational features of internal combustion engines of marine vessels during their operation in special environmental areas -Nitrogen Oxide Emission Control Areas. According to the requirements of Annex VI MARPOL, during the operation of marine diesel engines in these areas the content of nitrogen oxides in the exhaust gases should be less than 3.4 g/(kW×h). The article touches upon the possible technical measures to ensure the maintenance of the required level of nitrogen oxide emissions in the exhaust gases of marine diesel engines. The authors propose to use an exhaust gas recirculation system, with a certain amount of gases supplied back to the cylinder after preliminary cooling and mixing with air, which reduces the maximum combustion temperature to values that prevent the formation of nitrogen oxides. The experiment proved that the recirculation of exhaust gases in the 4.7 ... 18.8% range helps to reduce the concentration of nitrogen oxides in exhaust gases by 19.5 ... 48.8%. At the same time, it is necessary to ensure values that meet the requirements of international organizations aimed at protecting the air from pollution and allowing the use of marine vessels in areas of increased environmental control. SažetakČlanak se bavi operativnim značajkama brodskih motora s unutarnjim izgaranjem u posebnim područjima zaštite okoliša -područja kontrole emisija dušikovih oksida. Prema odredbama Priloga VI. MARPOL konvencije, tijekom rada brodskih dizelskih motora, u posebnim područjima sadržaj dušikovih oksida u ispušnim plinovima ne smije prelaziti 3,4 g/(kW×h). Članak se bavi potencijalnim tehničkim mjerama za održavanje određene razine emisija dušikovih oksida u ispušnim plinovima brodskih dizelskih motora. Autori predlažu uporabu sustava recirkulacije ispušnih plinova s određenom količinom plinova koji se vraćaju u cilindar nakon prethodnog hlađenja i miješanja sa zrakom, što smanjuje najvišu temperaturu izgaranja do vrijednosti koje sprječavaju stvaranje dušikovih oksida. Pokus je potvrdio da recirkulacija ispušnih plinova u rasponu od 4,7 do 18,8 % pomaže pri smanjenju koncentracije dušikovih oksida u ispušnim plinovima za 19,5 do 48,8 %. istodobno je potrebno osigurati vrijednosti koje su u skladu s propisima međunarodnih organizacija s ciljem zaštite zraka od onečišćenja i uporabe brodskih motora u područjima povećane kontrole okoliša. KEY WORDSlow-speed marine diesel environmental performance of a diesel engine concentration of nitrogen oxides in exhaust gases exhaust gas recirculation effective power specific fuel oil consumption KLJUČNE RIJEČI sporohodni brodski dizelski motori skrb za okoliš dizelskih motora koncentracija dušikovih oksida u ispušnim plinovima recirkulacija ispušnih plinova efektivna snaga specifična potrošnja goriva

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Section: Literature Review / Pregled Literaturementioning

confidence: 99%

The Use of Exhaust Gas Recirculation for Ensuring the Environmental Performance of Marine Diesel Engines

Sagin¹,

Kuropyatnyk²

2018

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“…In all the cases, the ambient pressure is constant as 1.1MPa. The total fuel volume is constant as 16.5 mm 3 , for which the engine speed and load condition are 1200 r/m and 4 bar with a 2.0L diesel engine [8]. …”

Section: Test Casesmentioning

confidence: 99%

“…And some new combustion modes have been established, such as HCCI (Homogeneous Charge Compression Ignition) and LTC (Low Temperature Combustion) [7][8][9]. In these new combustion modes, the multiple injection strategies are employed to intensify fuel-air mixture, to improve the combustion and reduce exhaust emissions.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Multiple Injection Diesel Spray Employed Common Rail System

Zhang

Zhao

Deng

et al. 2013

JTST

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The multiple injection strategies have been widely employed in many new diesel applications, such as HCCI (Homogeneous Charge Compression Ignition) and LTC (Low Temperature Combustion), which are very effective in improving fuel-air mixture and entrainment. In this paper, using high injection pressure of common rail and high-speed camera system, the experimental studies on the spray characteristics of the single, double and triple injections are conducted. The spray average fuel/air equivalence ratio is employed to evaluate the overall effects of the fuel-air mixture, which is the ratio of the fuel/air mass ratio in the spray and the fuel/air stoichiometric mass ratio. It is shown that the spray average fuel/air equivalence ratio decreased with the increased injection pressure, indicating that increasing injection pressure could intensify fuel-air mixture. For double injections, spray tip penetrations and volumes increase with the increased injected volume percentage. It is also found that spray development rate of the second injection is higher than the first injection. Double injections lead to lower spray average fuel/air equivalence ratios than the single injections. For triple injections, the spray average fuel/air equivalence ratios are almost lower than stoichiometry. The triple injection of which the volume distribution of every injection time is evenly has the lowest spray average fuel/air equivalence ratio, and has the best effect of fuel-air mixture.

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“…Several combustion strategies have been investigated with the aim of reducing the costs caused by using aftertreatment systems [2]. These strategies are intended to keep the benefits of CDC operation in terms of performance and improve the engine efficiency [3].…”

Section: Introductionmentioning

confidence: 99%

Dual-Fuel Combustion for Future Clean and Efficient Compression Ignition Engines

et al. 2016

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Stringent emissions limits introduced for internal combustion engines impose a major challenge for the research community. The technological solution adopted by the manufactures of diesel engines to meet the NOx and particle matter values imposed in the EURO VI regulation relies on using selective catalytic reduction and particulate filter systems, which increases the complexity and cost of the engine. Alternatively, several new combustion modes aimed at avoiding the formation of these two pollutants by promoting low temperature combustion reactions, are the focus of study nowadays. Among these new concepts, the dual-fuel combustion mode known as reactivity controlled compression ignition (RCCI) seems more promising because it allows better control of the combustion process by means of modulating the fuel reactivity depending on the engine operating conditions. The present experimental work explores the potential of different strategies for reducing the energy losses with RCCI in a single-cylinder research engine, with the final goal of providing the guidelines to define an efficient dual-fuel combustion system. The results demonstrate that the engine settings combination, piston geometry modification, and fuel properties variation are good methods to increase the RCCI efficiency while maintaining ultra-low NOx and soot emissions for a wide range of operating conditions.

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Energy efficiency improvement strategies for a diesel engine in low-temperature combustion

Cited by 79 publications

References 28 publications

The Use of Exhaust Gas Recirculation for Ensuring the Environmental Performance of Marine Diesel Engines

The Use of Exhaust Gas Recirculation for Ensuring the Environmental Performance of Marine Diesel Engines

Characteristics of the Multiple Injection Diesel Spray Employed Common Rail System

Dual-Fuel Combustion for Future Clean and Efficient Compression Ignition Engines

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