The potential of RCCI concept to meet EURO VI NOx limitation and ultra-low soot emissions in a heavy-duty engine over the whole engine map

Benajes, Jesús; Pastor, Javier; García, Antonio; Monsalve‐Serrano, Javier

doi:10.1016/j.fuel.2015.07.064

Cited by 129 publications

(46 citation statements)

References 30 publications

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“…In this sense, several studies confirm that, in order to achieve high efficiency while reducing NOx and soot emissions, the higher portion of the energy should come from the low reactivity fuel [22,26]. This fact suggests that the low reactivity fuel characteristics and its amount in the blend must have a key role on the in-cylinder reactivity, so this will be the fuel source varied during the investigation.…”

Section: Paths For Increasing Rcci Efficiencymentioning

confidence: 84%

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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Section: Paths For Increasing Rcci Efficiencymentioning

confidence: 84%

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

et al. 2016

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“…include fuel ratio [14], injection strategy [15][16][17][18], EGR rate [19], compression ratio [16], bowl geometry [20,21], stability control, and utilization of two injectors.…”

Section: Improvement Trends For Internal Combustion Enginesmentioning

confidence: 99%

Reactivity Controlled Compression Ignition (RCCI) of Gasoline- CNG Mixtures

Firmansyah¹,

Aziz²,

Heikal³

et al. 2018

Improvement Trends for Internal Combustion Engines

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Reactivity controlled compression ignition (RCCI) is a dual fuel combustion method that relies on the significant difference in reactivity of the fuels involved. RCCI had a low performance at high engine speed due to its high tendency on knocking and high pressure rise rate. Therefore, this study investigates the effect of the fuel stratification on the RCCI combustion and its extended to the interaction of two low reactive fuels, gasoline and compressed natural gas (CNG), in the RCCI combustion system. The investigation was experimentally performed on a single cylinder engine and constant volume chamber. The stratification was created by varying injection timing in the engine by injecting CNG at 80 and 120 before top dead center (BTDC) and varying injection gap in the constant volume chamber with the gaps between two fuel injection timing were varied between 0 ms to 20 ms. The results in the engine experiment show that proportions of gasoline and CNG and degree of stratification of CNG were found to be effective means of combustion control within certain limits of engine load and HC and CO emissions could be significantly reduced. While in constant volume chamber it has a significant effect on the combustion phasing. Stratified mixture produces shorter combustion duration while homogeneous mixture produces longer duration.

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“…In all the cases, the most suitable combination of biofuels was B7 +E10-95 as it provided highest gross indicated efficiency with ultra-low NOx and soot low emissions. In addition, further work showed that this combination of biofuels allows achieving a clean and efficient operation up to full load when using an effective CR of 11:1, but practically the RCCI concept is limited to around 70% load due to excessive in-cylinder PRRs [26]. Taking into account this experimental background and considering the high CR of the production engine used in the current, the LRF selected for performing this study was E20-95.…”

Section: Fuels and Deliverymentioning

confidence: 99%

“…To explore the RCCI operating limits with a well-defined criteria, an experimental procedure derived from the one described in [26] was applied. This procedure is summarized in Fig.…”

Section: Experimental Procedures Considerationsmentioning

confidence: 99%

“…A previous work of the authors demonstrated that, if ultra-low NOx and soot emissions are pretended to be reached by only operating under RCCI regime, the maximum operable load becomes restricted due to the excessive pressure rise rates (PRR) experienced [26]. In particular, RCCI operation was limited to 50% load in the case of using a CR of 14.4:1 and was limited to 70% when using a CR of 11:1.…”

Section: Introductionmentioning

confidence: 99%

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An assessment of the dual-mode reactivity controlled compression ignition/conventional diesel combustion capabilities in a EURO VI medium-duty diesel engine fueled with an intermediate ethanol-gasoline blend and biodiesel

Benajes

García

Monsalve‐Serrano

et al. 2016

Energy Conversion and Management

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a b s t r a c tThis work investigates the capabilities of the dual-mode reactivity controlled compression ignition/conventional diesel combustion engine operation to cover the full operating range of a EURO VI medium-duty diesel engine with compression ratio of 17.5:1. This concept is based on covering all the engine map switching between the reactivity controlled compression ignition and the conventional diesel combustion operating modes. Specifically, the benefits of reactivity controlled compression ignition combustion are exploited whenever possible according to certain restrictions, while the conventional diesel combustion operation is used to cover the zones of the engine map in which the reactivity controlled compression ignition operation is limited.The experiments were conducted using a single-cylinder research diesel engine derived from the multi-cylinder production engine. In addition, considering the mandatory presence of biofuels in the future context of road transport and the ability of ethanol to be blended with gasoline, the low reactivity fuel used in the study is a blend of 20% ethanol by volume with 80% of 95 octane number gasoline. Moreover, a diesel containing 7% of biodiesel has been used as high reactivity fuel. Firstly, a reactivity controlled compression ignition mapping is performed to check the operational limits of the concept in this engine platform. Later, based on the results, the potential of the dual-mode concept is discussed.Results suggest that, under the constraints imposed, reactivity controlled compression ignition combustion can be utilized between 25% and 35% load. In this region of the map, reactivity controlled compression ignition can provide up to 2% increased gross indicated efficiency than conventional diesel combustion, but led to lower efficiency at low engine speeds. In addition, it was demonstrated that the regeneration periods of the diesel particulate filter during dual-mode operation can be reduced more than twice, which entails a great reduction of the diesel fuel amount injected in the exhaust line.

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The potential of RCCI concept to meet EURO VI NOx limitation and ultra-low soot emissions in a heavy-duty engine over the whole engine map

Cited by 129 publications

References 30 publications

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

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

Reactivity Controlled Compression Ignition (RCCI) of Gasoline- CNG Mixtures

An assessment of the dual-mode reactivity controlled compression ignition/conventional diesel combustion capabilities in a EURO VI medium-duty diesel engine fueled with an intermediate ethanol-gasoline blend and biodiesel

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