Reactivity Controlled Compression Ignition: An Advanced Combustion Mode for Improved Energy Efficiency

Dalha, Ibrahim B.; Said, Mohd Ismid Mohd; Karim, Zainal Ambri Abdul; Aziz, A. Rashid A.; Firmansyah, Firmansyah; Abidin, Ezrann Zharif Zainal; Ismael, Mhadi A.

doi:10.1007/978-981-15-0102-9_6

Cited by 5 publications

(4 citation statements)

References 56 publications

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“…A trend of decrease happened at only a 60% fraction when operated at full load. The differences might attribute to variability in mixture homogeneity due to advanced injection timing [22]. However, these patterns signify that neither increase in the CO 2 proportion nor that of biogas fraction has a significant influence on the PPRR; hence, the parameters might not influence an increase in the ringing intensity.…”

Section: A Combustion Process Characterizationmentioning

confidence: 96%

Effects of Elevated Diluent Contents on the Combustion and Emissions of Biogas-Diesel RCCI Engine at Full Load

Fattahi¹

2020

IJET

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Difficulty in carbon dioxide (CO2) removal, coupled with the poor combustion due to diverse constituent of biogas, encouraged an investigation of the influence of high diluent (CO2, 25 -45% vol) content and biogas fraction (40 -70%) on the emissions of biogas/diesel dual-fuel reactivity-controlled compression ignition engine. The experiment was conducted at full load and a speed of 1600 rpm. The results showed distinct temperature trends for all the CO2 ratios and biogas fractions while radiation absorption effect of high CO2 content inhibits the combustion. Biogas with 35% CO2 proportion and a fraction of 50% produced the highest maximum temperature and heat released. The combustion resulted in a lower PPRR minimizing the higher-ringing strength tendency. At a 40% biogas fraction and 25% CO2, which simultaneously showed the highest ITE of 38.29%, the lowest BSFC of 7.41 g/kWh was achieved. An increase in the biogas fraction indicated a significant decrease in the nitrogen oxides (NOx) and particulate (PM) emissions by approximately 62.66, and 26.59%, respectively. Also, an increase in the diluent CO2 content decrease the carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions by approximately 20.30, and 38.83%, respectively. However, an increase in those parameters resulted in a severe UHC and CO emissions trade-off with the NOx and PM emissions, though a 70% biogas fraction indicated the potentials of reducing the impact of the trade-off.

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Section: A Combustion Process Characterizationmentioning

confidence: 96%

Effects of Elevated Diluent Contents on the Combustion and Emissions of Biogas-Diesel RCCI Engine at Full Load

Fattahi¹

2020

IJET

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“…This method is suitable for fuels with a similar chemical composition and physical state. At the same time research mainly focuses on the influence of different proportions of fuels in the mixture on the increase of combustion efficiency [10,13,32], engine knock reduction [3,28,40] and the emission of harmful compounds in exhaust gases [1,17,24].…”

Section: The History Of Dual-fuel Systemsmentioning

confidence: 99%

Effects of mixture formation strategies on combustion in dual-fuel engines – a review

Pielecha¹,

Sidorowicz²

2021

Combustion Engines

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The article presents an overview of technical solutions for dual fuel systems used in internal combustion engines. It covers the historical and contemporary genesis of using two fuels simultaneously in the combustion process. The authors pay attention to the value of the excess air coefficient in the cylinder, as the ignitability of the fuel dose near the spark plug is a critical factor. The mixture formation of compression ignition based systems are also analyzed. The results of research on indirect and direct injection systems (and their combinations) have been presented. Research sections were separated based to the use of gasoline with other fuels or diesel oil with other fuels. It was found that the use of two fuels in different configurations of the fuel supply systems extends the conditions for the use of modern combustion systems (jet controlled compression ignition, reactivity controlled compression ignition, intelligent charge compression ignition, premixed charge compression ignition), which will enable further improvement of combustion efficiency.

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“…However, the high in-cylinder temperature has been the expected cause of PPRR, hence having high PPRR at a mid 5.5 bar IMEP deviate from the usual trend. Homogeneity of the mixture due to advanced injection timing could be a contributing factor in rising the PPRR [41]. Looking at it from another perspective, the values of the PPRR obtained are generally low, in fact, much lower than the 4 bar/CA as the EURO VI limit for the light-duty diesel engine.…”

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confidence: 91%

An Experimental Investigation on the Influence of Port Injection at Valve on Combustion and Emission Characteristics of B5/Biogas RCCI Engine

et al. 2020

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High unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions, on account of the premixed air-fuel mixture entering the crevices and pre-mature combustion, are setbacks to reactivity-controlled compression ignition (RCCI) combustion at a low load. The influence of direct-injected B5 and port injection of biogas at the intake valve was, experimentally, examined in the RCCI mode. The port injection at the valve was to elevate the temperature at low load and eliminate premixing for reduced pre-mature combustion and fuel entering the crevices. An advanced injection timing of 21° crank angle before top dead centre and fraction of 50% each of the fuels, were maintained at speeds of 1600, 1800 and 2000 rpm and varied the load from 4.5 to 6.5 bar indicated mean effective pressure (IMEP). The result shows slow combustion as the load increases with the highest indicated thermal efficiency of 36.33% at 5.5 bar IMEP. The carbon dioxide and nitrogen oxides emissions increased, but UHC emission decreased, significantly, as the load increases. However, CO emission rose from 4.5 to 5.5 bar IMEP, then reduced as the load increases. The use of these fuels and biogas injection at the valve were capable of averagely reducing the persistent challenge of the CO and UHC emissions, by 20.33% and 10% respectively, compared to the conventional premixed mode.

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Reactivity Controlled Compression Ignition: An Advanced Combustion Mode for Improved Energy Efficiency

Cited by 5 publications

References 56 publications

Effects of Elevated Diluent Contents on the Combustion and Emissions of Biogas-Diesel RCCI Engine at Full Load

Effects of Elevated Diluent Contents on the Combustion and Emissions of Biogas-Diesel RCCI Engine at Full Load

Effects of mixture formation strategies on combustion in dual-fuel engines – a review

An Experimental Investigation on the Influence of Port Injection at Valve on Combustion and Emission Characteristics of B5/Biogas RCCI Engine

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